Method for processing vanadium-titanium magnetite finished ores by using wet process

Abstract

A method for processing vanadium-titanium magnetite finished ores by using a wet process. The method comprises the steps: extracting vanadium from vanadium-titanium magnetite finished ores and processing, by using the vanadium extraction method, obtained leaching residue by using a wet process, so as to obtain titanium; and calcining the remaining liquid extracted during the vanadium extraction, so as to prepare ferric oxide. The flow of the method is short, and the energy consumption is low, thereby avoiding waste of a titanium resource.

Claims

1. A method for preparing titanium slag by performing hydrometallurgical treatment on vanadium-titanium magnetite concentrate, comprising the following steps: 1) mixing the vanadium-titanium magnetite concentrate and a HCl solution, and leaching for 1 to 10 h at 100-150 C. to obtain an intermediate slurry; 2) filtering the intermediate slurry to obtain leaching residues, and carrying out two-stage water washing on the leaching residues, wherein a water washing time ranges from 5 min to 60 min and a water washing temperature ranges from 25 C. and 80 C. in each stage of water washing; 3) neutralizing water washing residues obtained in the step 2) with a diluted alkaline solution for 5 to 60 min at 25-80 C., adjusting the pH value of the slurry to 5-6, and filtering the neutralized slurry to obtain neutralization slag; 4) mixing the neutralization slag with a NaOH solution, and carrying out alkaline washing and desilicification reaction at 50-110 C. for 5 min to 60 min; 5) filtering a product obtained after the alkaline washing and desilicification reaction in the step 4) to obtain alkaline washing residues and carrying out water washing on the alkaline washing residues; and 6) washing the water washing residues obtained after water washing in the step 5) with diluted sulfuric acid and adjusting the pH value to 5-6, filtering after acid washing, and drying filter residues to obtain the titanium slag.

2. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid mass ratio of the concentrate to the HCl solution in the step 1) is in a range from 1:1 to 10:1.

3. The method for preparing the titanium slag according to claim 2, wherein the percentage concentration by mass of the HCl solution in the step 1) is in a range from 10% to 36%.

4. The method for preparing the titanium slag according to claim 1, wherein the percentage concentration by mass of the HCl solution in the step 1) is in a range from 10% to 36%.

5. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid ratio of the washing water to the leaching residues in each stage of water washing process in the step 2) is in a range from 2:1 to 10:1.

6. The method for preparing the titanium slag according to claim 4, wherein water washing slurry obtained in the step 2) is filtered to obtain first washing water and second washing water respectively, wherein the first washing water is used for a leaching process in the step 1), and the second washing water is used for an acid washing process in the step 6).

7. The method for preparing the titanium slag according to claim 1, wherein water washing slurry obtained in the step 2) is filtered to obtain first washing water and second washing water respectively, wherein the first washing water is used for a leaching process in the step 1), and the second washing water is used for an acid washing process in the step 6).

8. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid ratio of the diluted alkaline solution to the water washing residues in the step 3) is in a range from 2:1 to 10:1.

9. The method for preparing the titanium slag according to claim 8, wherein a concentration by mass of the diluted alkaline solution in the step 3) is in a range from 5% to 20%.

10. The method for preparing the titanium slag according to claim 8, wherein the diluted alkaline solution in the step 3) is a NaOH solution.

11. The method for preparing the titanium slag according to claim 1, wherein a concentration by mass of the diluted alkaline solution in the step 3) is in a range from 5% to 20%.

12. The method for preparing the titanium slag according to claim 1, wherein the diluted alkaline solution in the step 3) is a NaOH solution.

13. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid ratio of the NaOH solution to the neutralization slag in the step 4) is in a range from 2:1 to 10:1.

14. The method for preparing the titanium slag according to claim 13, wherein a percentage concentration by mass of the NaOH solution in the step 4) is in a range from 9% to 25%.

15. The method for preparing the titanium slag according to claim 1, wherein a percentage concentration by mass of the NaOH solution in the step 4) is in a range from 9% to 25%.

16. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid ratio of the washing water to the alkaline washing residues in the step 5) is in a range from 2:1 to 10:1.

17. The method for preparing the titanium slag according to claim 1, wherein a liquid-solid ratio of the diluted sulfuric acid to the water washing residues is in a range from 2:1 to 10:1.

18. The method for preparing the titanium slag according to claim 17, wherein a concentration of the diluted sulfuric acid in the step 6) is in a range from 5% vol to 20% vol.

19. The method for preparing the titanium slag according to claim 17, wherein washing liquor obtained after water washing and filtering in the step 6) is used for a neutralization process of the water washing residues in the step 3).

20. The method for preparing the titanium slag according to claim 1, wherein a concentration of the diluted sulfuric acid in the step 6) is in a range from 5% vol to 20% vol.

21. The method for preparing the titanium slag according to claim 1, wherein washing liquor obtained after water washing and filtering in the step 6) is used for a neutralization process of the water washing residues in the step 3).

22. A method for extracting vanadium from vanadium-titanium magnetite concentrate, comprising the following steps: 1) pre-reducing the vanadium-titanium magnetite concentrate at a reaction temperature of 600-1000 C. so as to reduce Fe(III) in the concentrate into Fe(II) to obtain a reduzate; 2) mixing the reduzate with HCl, and leaching for 1-10 h at 100-150 C. to obtain an intermediate slurry; 3) filtering the intermediate slurry to obtain a vanadium-containing leaching solution and leaching residues; 4) heating the vanadium-containing leaching solution to 30-90 C., stirring, and adding a reducing agent to reduce Fe(III) in the leaching solution into Fe(II) to obtain a reducing solution; 5) adjusting the pH value of the reducing solution obtained to 0.5 to 2, and filtering to obtain a filtered solution; 6) mixing the filtered solution obtained in the step 5) with an extracting agent, and extracting to obtain a vanadium-bearing organic phase and raffinate; 7) carrying out back extraction on the vanadium-bearing organic phase by using an acidic solution to obtain a vanadium-containing solution; and 8) preparing ammonium vanadate or vanadium pentoxide from the vanadium-containing solution.

23. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a reducing agent used in pre-reduction in the step 1) is gas or hydrogen.

24. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a mass ratio of the reduzate to the HCl in the step 2) is in a range from 1:1 to 1:10.

25. The method for extracting vanadium from vanadium-titanium magnetite concentration according to claim 24, wherein a percentage concentration by mass of the HCl in the step 2) is in a range from 10% to 36%.

26. The method for extracting vanadium from vanadium-titanium magnetite concentration according to claim 22, wherein a percentage concentration by mass of the HCl in the step 2) is in a range from 10% to 36%.

27. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a reducing agent of the step 4) is Fe powder or sodium sulfite.

28. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein an alkaline substance in the step 5) is one of NaOH, aqueous ammonia, CaCO.sub.3 or Ca(OH).sub.2.

29. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a proportion of the organic phase to an aqueous phase in the extraction process in the step 6) is in a range from 1:1 to 1:6.

30. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 29, wherein the extracting agent in the step 6) is a P204 and TBP kerosene mixed solvent, or a P507 and TBP kerosene mixed solvent.

31. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein the extracting agent in the step 6) is a P204 and TBP kerosene mixed solvent, or a P507 and TBP kerosene mixed solvent.

32. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a proportion of the vanadium-bearing organic phase to an aqueous phase in the back extraction process in the step 7) is in a range from 1:1 to 6:1.

33. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 32, wherein the acidic solution in the step 7) is 1-4.5 mol/L diluted sulfuric acid or 1-8 mol/L diluted HCl.

34. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein the acidic solution in the step 7) is 1-4.5 mol/L diluted sulfuric acid or 1-8 mol/L diluted HCl.

35. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein a preparation method of the step 8) is a precipitation method.

36. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein the leaching residues obtained by filtering in the step 3) are subjected to hydrometallurgical treatment which comprises the following steps: 3-1) carrying out two-stage water washing on leaching residues, wherein the water washing time ranges from 5 min to 60 min and the water washing temperature ranges from 25 C. to 80 C. in each stage of water washing; 3-2) neutralizing water washing residues obtained in the step 3-1) with a diluted alkaline solution for 5-60min at 25-80 C., adjusting the pH value of slurry to 5-6, and filtering the neutralized slurry to obtain a neutralization slag; 3-3) mixing the neutralization slag obtained in the step 3-2) with a NaOH solution, and carrying out alkaline washing and desilicification reaction at 50-110 C. for 5-60 min; 3-4) filtering the product obtained after alkaline washing and desilicification reaction in the step 3-3) to obtain alkaline washing residues and carrying out water washing; and 3-5) washing the water washing residues obtained after water washing in the step 3-4) with diluted sulfuric acid and adjusting the pH value to 5-6, filtering after acid washing, and drying filter residues to obtain titanium slag.

37. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a liquid-solid ratio of the diluted alkaline solution to the water washing residues in the step 3-2) is in a range from 2:1 to 10:1.

38. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 37, wherein a concentration by mass of the diluted alkaline solution in the step 3-2) is in a range from 5% to 20%.

39. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 37, wherein the diluted alkaline solution in the step 3-2) is a NaOH solution.

40. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a concentration by mass of the diluted alkaline solution in the step 3-2) is in a range from 5% to 20%.

41. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein the diluted alkaline solution in the step 3-2) is a NaOH solution.

42. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a liquid-solid ratio of the NaOH solution to the neutralization slag in the step 3-3) is in a range from 2:1 to 10:1.

43. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 42, wherein a percentage concentration by mass of the NaOH solution in the step 3-3) is in a range from 9% to 25%.

44. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a percentage concentration by mass of the NaOH solution in the step 3-3) is in a range from 9% to 25%.

45. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a liquid-solid ratio of the washing water to the alkaline washing residues in the step 3-4) is in a range from 2:1 to 10:1.

46. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a liquid-solid ratio of the diluted sulfuric acid to water washing residues in the step 3-5) is in a range from 2:1 to 10:1.

47. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 46, wherein the concentration of the diluted sulfuric acid in the step 3-5) is in a range from 5% vol to 20% vol.

48. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein the concentration of the diluted sulfuric acid in the step 3-5) is in a range from 5% vol to 20% vol.

49. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 48, wherein the washing liquor obtained after water washing and filtering in the step 3-5) is used for a neutralization process of the water washing residues in the step 3-2).

50. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 49, wherein the washing liquor obtained after water washing and filtering in the step 3-5) is used for a neutralization process of the water washing residues in the step 3-2).

51. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein the washing liquor obtained after water washing and filtering in the step 3-5) is used for a neutralization process of the water washing residues in the step 3-2).

52. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein the raffinate in the step 6) is calcined to prepare ferric oxide.

53. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 36, wherein a liquid-solid ratio of washing water to leaching residues in each stage of water washing process in the step 3-1) is in a range from 2:1 to 10:1.

54. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 53, wherein the water washing slurry in the step 3-1) is filtered to obtain a first washing water and a second washing water respectively, wherein the first washing water is used for a leaching process in the step 2), and the second washing water is used for an acid washing process in the step 3-5).

55. The method for extracting vanadium from vanadium-titanium magnetite concentrate according to claim 22, wherein the raffinate in the step 6) is calcined to prepare ferric oxide.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a process flow diagram of embodiment 1 of the invention.

(2) FIG. 2 is a process flow diagram of embodiment 6 of the invention.

(3) FIG. 3 is a process flow diagram of embodiment 12 of the invention.

DETAIL DESCRIPTION OF THE INVENTION

(4) Embodiment 1

(5) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 52.25% of TFe, 14.32% of TiO.sub.2 and 1.15% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(6) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 50 min at 700 C. so as to reduce Fe(III) in the finished ores into Fe(II):

(7) (2) putting reduzate obtained in the step (1) in 36 wt % HCL, carrying out heat-preservation stirring for 2 h at 100 C. under the condition that a liquid-solid ratio is 1:1, and filtering to obtain a vanadium-containing leaching solution and leaching residue;

(8) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step 2), and reducing for 4 h at 30 C. so as to reduce Fe(III) in the leaching solution into Fe(II):

(9) (4) adjusting pH of the reducing solution obtained in the step (3) with CaCO3 to 0.5, and filtering;

(10) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 20% P204 and 5% TBP for two times according to a volume ratio of 1:1:

(11) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for four times by using 1 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:1 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 1.25%, and the extraction rate of vanadium is 98.26%;

(12) (7) carrying out secondary water washing on the leaching residue obtained in the step (2) for 15 min at 80 C. under the condition that a liquid-solid ratio is 4:1; (8) neutralizing water washing residue obtained after filtering with a NaOH alkaline solution having the concentration of 10% for 30 min at 40 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 5:1, adjusting the pH value of slurry to 5-6, and then filtering to obtain neutralization residue;

(13) (9) subjecting the neutralization residue and a 15% NaOH solution to a desilicification reaction for 30 min at 80 C. wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 3:1; and then filtering and carrying out water washing, and then filtering to obtain water washing residue, wherein a liquid-solid ratio of water to alkaline washing residue is 2:1; and

(14) (10) washing the obtained water washing residue with 20% diluted sulfuric acid and adjusting the pH value to 5-6, wherein a liquid-phase ratio of the diluted sulfuric acid to the water washing residue is 2:1; and finally, drying residue obtained by filtering to obtain titanium residue.

(15) Embodiment 2

(16) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 42.13% of TFe, 19.43% of TiO.sub.2, 0.98% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes:

(17) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 20 min at 800 C. so as to reduce Fe(III) in the finished ores into Fe(II);

(18) (2) putting the obtained reduzate obtained in the step (1) in 10 wt % HCL, carrying out heat-preservation stirring for 10 h at 150 C. under the condition that a liquid-solid ratio is 10:1, and filtering to obtain a vanadium-containing leaching solution and leaching residue;

(19) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 0.5 h at 90 C. so as to reduce Fe(III) in the leaching solution into Fe(II);

(20) (4) adjusting pH of the reducing solution obtained in the step (3) with Ca(OH).sub.2 to 2, and filtering;

(21) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 30% P507 and 5% TBP for five times according to a volume ratio of 6:1; (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for two times by using 4.5 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:1 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 3.13%, and the extraction rate of vanadium is 97.35%:

(22) (7) carrying out water washing on the leaching residue obtained in the step (2) for 30 min at 60 C. under the condition that a liquid-solid ratio is 3:1;

(23) (8) neutralizing the water washing residue obtained after filtering with a NaOH alkaline solution having the concentration of 5% for 20 min at 60 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 10:1, adjusting the pH value of slurry to 5-6, and then filtering to obtain neutralization residue;

(24) (9) subjecting the neutralization residue and a 9% NaOH solution to a desilicification reaction for 5 min at 110 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 6:1; and then filtering and carrying out water washing, and then filtering to obtain water washing residue, wherein a liquid-solid ratio of water to alkaline washing residue is 10:1; and

(25) (10) washing the obtained water washing residue with 50% diluted sulfuric acid and adjusting the pH value to 5-6, wherein a liquid-solid ratio of the diluted sulfuric acid to the water washing residue is 10:1; and finally, drying residue obtained by filtering to obtain titanium residue.

(26) Embodiment 3

(27) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 40.16% of TFe, 20.15% of TiO.sub.2, 1.03% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(28) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 60 min at 750 C. so as to reduce Fe(III) in the finished ores into Fe(I);

(29) (2) putting the reduzate obtained in the step (1) in 20 wt % HCL, carrying out heat-preservation stirring for 6 hours at 120 C. under the condition that a liquid-solid ratio is 1:5, and filtering to obtain a vanadium-containing leaching solution and leaching residue;

(30) (3) adding sodium sulfite to the vanadium-containing leaching solution obtained in the step (2), and reducing for 3 h at 50 C. so as to reduce Fe(III) in the leaching solution into Fe(II):

(31) (4) adjusting pH of the reducing solution obtained in the step (3) with NaOH to 0.2, and filtering;

(32) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 25% P204 and 10% TBP for four times according to a volume ratio of 5:1;

(33) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for three times by using 8 mol/L HCL under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:4 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 2.38%, and the extraction rate of vanadium is 99.05%;

(34) (7) carrying out secondary water washing on the leaching residue obtained in the step (2) for 60 min at 25 C. under the condition that a liquid-solid ratio is 6:1;

(35) (8) neutralizing the water washing residue obtained after filtering with a NaOH alkaline solution having a concentration of 20% for 10 min at 80 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 2:1, adjusting the pH value of slurry to 5-6, and then filtering to obtain neutralization residue;

(36) (9) subjecting the neutralization residue and a 13% NaOH solution to a desilicification reaction for 60 min at 80 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 3:1; and then filtering and carrying out water washing, and then filtering to obtain water washing residue, wherein a liquid-solid ratio of water to alkaline washing residue is 4:1; and

(37) (10) washing the obtained water washing residue with 8% diluted sulfuric acid and adjusting the pH value to 5-6, wherein a liquid-solid ratio of the diluted sulfuric acid to the water washing residue is 4:1; and finally, drying residue obtained by filtering to obtain titanium residue.

(38) Embodiment 4

(39) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 43.09% of TFe, 18.56% of TiO.sub.2, 1.18% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(40) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 80 min at 600 C. so as to reduce Fe(III) in the finished ores into Fe(II);

(41) (2) putting the reduzate obtained in the step (1) in 10 wt % HCL, carrying out heat-preservation stirring for 1 h at 150 C. under the condition that a liquid-solid ratio is 1:10, and filtering to obtain a vanadium-containing leaching solution and leaching residue;

(42) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 2.5 h at 60 C. so as to reduce Fe(III) in the leaching solution into Fe(II):

(43) (4) adjusting pH of the reducing solution obtained in the step (3) with aqueous ammonia to 1, and filtering:

(44) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 30% P204 and 5% TBP for three times according to a volume ratio of 3:1;

(45) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for three times by using 1 mol/L HCL under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:6 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 3.0%, and the extraction rate of vanadium is 98.65%;

(46) (7) carrying out water washing on the leaching residue obtained in the step (2) for 45 min at 40 C. under the condition that a liquid-solid ratio is 9:1;

(47) (8) neutralizing the water washing residue obtained after filtering with a NaOH alkaline solution for 60 min at 30 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 3:1, adjusting the pH value of slurry to 5-6, and then filtering to obtain neutralization residue;

(48) (9) subjecting the neutralization residue and a 25% NaOH solution to a desilicification reaction for 20 min at 60 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 2:1; filtering and then carrying out water washing, and then filtering to obtain water washing residue, wherein a liquid-solid ratio of water to alkaline washing residue is 6:1; and

(49) (10) washing the obtained water washing residue with 12% diluted sulfuric acid and adjusting the pH value to 5-6, wherein a liquid-solid ratio of the diluted sulfuric acid to the water washing residue is 6:1; and finally, drying residue obtained by filtering to obtain titanium residue.

(50) Embodiment 5

(51) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 49.77% of TFe, 19.12% of TiO.sub.2, 1.03% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes:

(52) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 20 min at 100 C. so as to reduce Fe(III) in the finished ores into Fe(II):

(53) (2) putting the reduzate obtained in the step (1) in 20 wt % HCL, carrying out heat-preservation stirring for 10 hour at 100 C. under the condition that a liquid-solid ratio is 5:1, and filtering to obtain a vanadium-containing leaching solution and leaching residue;

(54) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 3 h at 90 C. so as to reduce Fe(II) in the leaching solution into Fe(II);

(55) (4) adjusting pH of the reducing solution obtained in the step (3) with NaOH to 2, and filtering;

(56) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 25% P507 and 10% TBP for five times according to a volume ratio of 4:1;

(57) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for four times by using 1 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:4 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 2.73%, and the extraction rate of vanadium is 99.25%;

(58) (7) carrying out water washing on the leaching residue obtained in the step (2) for 5 min at 80 C. under the condition that a liquid-solid ratio is 10:1;

(59) (8) neutralizing the water washing residue obtained after filtering with a NaOH alkaline solution having a concentration of 9% for 5 min at 80 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 5:1, adjusting the pH value of slurry to 5-6, and then filtering to obtain neutralization residue;

(60) (9) subjecting the neutralization residue and a 9% NaOH solution to a desilicification reaction for 40 min at 50 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 10:1; filtering and then carrying out water washing, and then filtering to obtain water washing residue, wherein a liquid-solid ratio of water to alkaline washing residue is 5:1; and

(61) (10) washing the obtained water washing residue with 10% diluted sulfuric acid, and adjusting the pH value to 5-6, wherein a liquid-solid ratio of the diluted sulfuric acid to the water washing residue is 5:1; and finally, drying residue obtained by filtering to obtain titanium residue.

(62) Embodiment 6

(63) Vanadium-titanium magnetite finished ores are leached with 30% HCL at 150 C. in an airtight container, wherein a liquid-solid ratio of HCL to finished ores is 2:1, and after reaction of 4 h, leaching residue is subjected to secondary water washing for 15 min at 80 C. under the condition that a liquid-solid ratio is 4:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 10% for 30 min at 40 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 5:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 15% NaOH solution undergo a desilicification reaction for 30 min at 80 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 3:1; the slurry obtained after desilicification reaction is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 2:1; the obtained water washing residue is washed with 20% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 2:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(64) Embodiment 7

(65) Vanadium-titanium magnetite finished ores are leached with 10% HCL at 150 C. in an airtight container, wherein a liquid-solid ratio of HCL to finished ores is 10:1, and after reaction of 10 h is finished, leaching residue is subjected to water washing for 30 min at 60 C. under the condition that a liquid-solid ratio is 3:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 5% for 20 min at 60 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 10:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 9% NaOH solution undergo a desilicification reaction for n5 min at 110 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 6:1; the slurry obtained after the desilicification reaction is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 10:1; the obtained water washing residue is washed with 5% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 10:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(66) Embodiment 8

(67) Vanadium-titanium magnetite finished ores are leached with 20% HCL at 110 C. at ordinary pressure, wherein a liquid-solid ratio of HCL to finished ores is 5:1, and after reaction of 6 h is finished, leaching residue is subjected to water washing for 60 min at 25 C. under the condition that a liquid-solid ratio is 6:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 20% for 10 min at 80 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 2:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 13% NaOH solution undergo a desilicification reaction for 60 min at 80 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 3:1; the slurry obtained after the desilicification reaction is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 4:1; the obtained water washing residue is washed with 8% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 4:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(68) Embodiment 9

(69) Vanadium-titanium magnetite finished ores are leached with 36% concentrated HCL at 100 C. at ordinary pressure, wherein a liquid-solid ratio of HCL to finished ores is 1:1, and after reaction of 6 h is finished, leaching residue is subjected to water washing for 45 min at 40 C. under the condition that a liquid-solid ratio is 9:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 150% for 60 min at 30 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 3:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 25% NaOH solution undergo a desilicification reaction for 20 min at 60 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 2:1; the slurry obtained after the desilicification reaction is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 6:1; the obtained water washing residue is washed with 12% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 6:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(70) Embodiment 10

(71) Vanadium-titanium magnetite finished ores are leached with 36% concentrated HCL at 150 C. at ordinary pressure, wherein a liquid-solid ratio of HCL to finished ores is 8:1, and after reaction of 1 h is finished, leaching residue is subjected to water washing for 5 min at 80 C. under the condition that a liquid-solid ratio is 10:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 9% for 5 min at 80 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 5:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 9% NaOH solution undergo a desilicification reaction for 40 min at 500 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 10:1; the slurry obtained after the desilicification reaction is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 5:1; the obtained water washing residue is washed with 10% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 5:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(72) Embodiment 11

(73) Vanadium-titanium magnetite finished ores are leached with 10% HCL at 100 C. at ordinary pressure, wherein a liquid-solid ratio of HCL to finished ores is 1:1, and after reaction of 10 h is finished, leaching residue is subjected to water washing for 40 min at 60 C. under the condition that a liquid-solid ratio is 2:1. The water washing residue obtained after filtering is neutralized with a NaOH alkaline solution having a concentration of 20% for 60 min at 25 C. under the condition that a liquid-solid ratio of the alkaline solution to the water washing residue is 2:1, and the pH value of slurry is adjusted to 5-6. After filtering, the neutralization residue and a 20% NaOH solution undergo a desilicification reaction for 20 min at 90 C., wherein a liquid-solid ratio of the NaOH solution to the neutralization residue is 2:1; the slurry is filtered and then subjected to water washing, wherein a liquid-solid ratio of water to alkaline washing residue is 3:1; the obtained water washing residue is washed with 6% diluted sulfuric acid and the pH value is adjusted to 5-6, wherein a liquid-solid ratio of diluted sulfuric acid to water washing residue is 3:1; and finally, residue obtained by filtering is dried to obtain titanium residue.

(74) Embodiment 12

(75) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 52.25% of TFe, 14.32% of TiO.sub.2, 1.15% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(76) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 50 min at 700 C. so as to reduce Fe(III) in the finished ores into Fe(II);

(77) (2) putting the reduzate obtained in the step (1) in 36 wt % HCL, carrying out heat-preservation stirring for 2 hours at 100 C. under the condition that a liquid-solid ratio is 1:1, and filtering to obtain a vanadium-containing leaching solution;

(78) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 4 h at 30 C. so as to reduce Fe(III) in the leaching solution into Fe(II):

(79) (4) adjusting pH of the reducing solution obtained in the step (3) with CaCO3 to 0.5, and filtering;

(80) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 20% P204 and 5% TBP for two times according to a volume ratio of 1:1; and

(81) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for four times by using 1 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:1 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 1.25%, and the extraction rate of vanadium is 98.26%.

(82) Embodiment 13

(83) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 42.13% of TFe, 19.43% of TiO.sub.2, 0.98% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes:

(84) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 20 min at 800 C. to reduce Fe(III) in the finished ores into Fe(II);

(85) (2) putting the reduzate obtained in the step (1) in 10 wt % HCL, carrying out heat-preservation stirring for 10 h at 150 C. under the condition that a liquid-solid ratio is 10:1, and filtering to obtain a vanadium-containing leaching solution;

(86) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 0.5 h at 90 C. so as to reduce Fe(II) in the leaching solution into Fe(II);

(87) (4) adjusting pH of the reducing solution obtained in the step (3) with Ca(OH).sub.2 to 2, and filtering;

(88) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 30% P507 and 5% TBP for five times according to a volume ratio of 6:1; and

(89) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for two times by using 4.5 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:1 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 3.13%, and the extraction rate of vanadium is 97.35%.

(90) Embodiment 14

(91) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 40.16% of TFe, 20.15% of TiO.sub.2 and 1.03% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(92) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 60 min at 750 C. so as to reduce Fe(III) in the finished ores into Fe(II):

(93) (2) putting the reduzate obtained in the step (1) in 20 wt % HCL, carrying out heat-preservation stirring for 6 h at 120 C. under the condition that a liquid-solid ratio is 1:5, and filtering to obtain a vanadium-containing leaching solution:

(94) (3) adding sodium sulfite to the vanadium-containing leaching solution obtained in the step (2), and reducing for 3 h at 50 C. so as to reduce Fe(III) in the leaching solution into Fe(II);

(95) (4) adjusting pH of the reducing solution obtained in the step (3) with NaOH to 0.2, and filtering;

(96) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 25% P204 and 10% TBP for four times according to a volume ratio of 5:1; and

(97) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for three times by using 8 mol/L HCL under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:4 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 2.38%, and the extraction rate of vanadium is 99.05%.

(98) Embodiment 15

(99) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 43.09% of TFe, 18.65% of TiO.sub.2, 1.18% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes;

(100) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 80 min at 600 C. so as to reduce Fe(III) in the finished ores into Fe(WI);

(101) (2) putting the reduzate obtained in the step (1) to 10 wt % HCL, carrying out heat-preservation stirring for 1 h at 150 C. under the condition that a liquid-solid ratio is 1:10, and filtering to obtain a vanadium-containing leaching solution:

(102) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 2.5 h at 60 C. so as to reduce Fe(II) in the leaching solution into Fe(II);

(103) (4) adjusting pH of the reducing solution obtained in the step (3) with aqueous ammonia to 1, and filtering;

(104) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 30% P204 and 5% TBP for three times according to a volume ratio of 3:1; and

(105) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for three times by using 1 mol/L HCL under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:6 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 3.0%, and the extraction rate of vanadium is 98.65%.

(106) Embodiment 16

(107) The main ingredients of vanadium-titanium magnetite finished ores as a raw material by mass content are as follows: 49.77% of TFe, 19.12% of TiO.sub.2, 1.03% of V.sub.2O.sub.5, and 80% of vanadium-titanium magnetite finished ores which are ground into 200 meshes:

(108) (1) pre-reducing the ground vanadium-titanium magnetite finished ores in a fluidized bed for 20 min at 100 C. so as to reduce Fe(III) in the finished ores into Fe(II);

(109) (2) putting the reduzate obtained in the step (1) in 20 wt % HCL, carrying out heat-preservation stirring for 10 h at 100 C. under the condition that a liquid-solid ratio is 5:1, and filtering to obtain a vanadium-containing leaching solution;

(110) (3) adding Fe powder to the vanadium-containing leaching solution obtained in the step (2), and reducing for 3 h at 90 C. so as to reduce Fe(II) in the leaching solution into Fe(II);

(111) (4) adjusting pH of the reducing solution obtained in the step (3) with NaOH to 2, and filtering;

(112) (5) extracting the solution obtained in the step (4) and a kerosene mixed solvent of 25% P507 and 10% TBP for five times according to a volume ratio of 4:1; and

(113) (6) carrying out back extraction on a loaded vanadium-bearing organic phase obtained in the step (5) for four times by using 1 mol/L sulfuric acid under the condition that a ratio of the loaded organic phase to an aqueous phase is 1:4 to obtain a pure vanadium-containing solution, wherein the extraction rate of iron is 2.73%, and the extraction rate of vanadium is 99.25%.

(114) Of course, the invention can also have multiple embodiments, and those skilled in the art, without departing from the spirit and the essence of the invention, can make various corresponding modifications and variations according to the disclosure of the invention, however, said corresponding modifications and variations should fall into the protection scope of claims of the invention.