METHOD FOR CONVERTING AND SEPARATING VANADIUM, TITANIUM, AND IRON FROM VANADIUM-TITANIUM-IRON CONCENTRATE IN ONE STEP

Abstract

The present invention relates to a method for converting and separating vanadium, titanium, and iron from the vanadium-titanium-iron concentrate in one step, which includes the steps as below. (1) The vanadium-titanium-iron concentrate is mixed and roasted together with addition agent and reducing, agent, and thereby vanadium-containing pig iron and vanadium enriched slag are obtained. (2) The vanadium titanium enriched slag is leached in water and filtered, and thereby vanadium-containing solution and titanium slag are obtained. The technical features of the present invention are as below. By the new process of sodium reduction coupling, a new system of low-temperature smelting multiphase reaction separation is constructed. The reduction of iron, sodiumizing of vanadium, and the melting separation process of the vanadium titanium enriched slag and the iron are achieved in one step. Three products, i.e., the vanadium-containing pig iron, the vanadium-containing solution, and the titanium slag are produced.

Claims

1. A method for converting and separating vanadium, titanium, and iron from vanadium-titanium-iron concentrate in one step, comprising: step 1, Mixing vanadium-titanium-iron concentrate with an addition agent and a reducing agent, conducting roasting for 0.5-4 hours at a temperature of 1100-1400° C., so that vanadium-containing pin iron and vanadium titanium enriched slag are obtained, wherein a ratio by weight is vanadium-titanium-iron concentrate: addition agent: reducing, agent=100: (40-80); (20-50); step 2, Leaching the vanadium titanium enriched slag obtained in the step 1 in water, conducting filtering, such that a vanadium-containing solution and a titanium slag are obtained.

2. The method of claim 1, wherein the major compositions of the vanadium-titanium-iron concentrate in the step 1 includes iron with a total mass fraction of 30%-60%, V.sub.2O.sub.5 with a mass fraction of 0.15% -2.0%, and TiO2 with a mass fraction of 5%-35%.

3. The method of claim 1, wherein the addition agent in the step 1 is one item or a mixture of more than one items selected from a group consisting of sodium carbonate, sodium hydroxide, sodium sulfate, sodium chloride, sodium borate, and sodium bicarbonate.

4. The method of claim 1, wherein the reducing agent in the step 1 is one item or a mixture of more than one items selected from a group consisting of anthracite, bituminous coal, brown coal, and coke.

5. The method of claim 1, wherein the vanadium-containing pig iron in the step 1 has an iron mass fraction of 90%-98%, and a vanadium mass fraction of 0.05%-1%.

6. The method of claim 1, wherein a leaching liquid-solid ratio in the step 2 is 1:1-5:1, a leaching temperature is 30-100° C., and a leaching time is 0.5-4 hours.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] FIG. 1 is the process flow chart of the method for converting and separating vanadium, titanium, and iron from vanadium-titanium-iron concentrate in one step of the present invention.

DETAILED DESCRIPTION

[0019] Further description of the present invention in conjunction with specific embodiments will be described as below.

Embodiment 1

[0020] 100 parts of 1# Vanadium-titanium-iron concentrate, 40 puts of sodium carbonate, and 20 parts of anthracite are well mixed. Then, the mixture is kept for 3 hours in a muffle furnace at temperature of 1200° C. Vanadium-containing pig iron and vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for 2 hours under the condition of 30° C. and a liquid-solid ratio of 2:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical compositions of the vanadium-titanium-iron concentrate are shown in table 1. The separating results of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 97.62%, and the recovery rate is up to 99.40%. The concentration of the vanadium-containing solution V.sub.2O.sub.5 is 3.2 g/L, and the recovery rate of vanadium is 70.46%. The TiO.sub.2 grade of the titanium enriched slag is 35.67%. and the recovery rate of titanium is 99.77%. The conversion and separation of iron, vanadium, and titanium from vanadium-titanium-iron concentrate are well achieved,

Embodiment 2

[0021] 100 parts of 2# vanadium-titanium-iron concentrate, 60 parts of sodium bicarbonate and 30 parts of coke are well mixed. Then, the mixture is kept for 4 hours in a muffle furnace at temperature of 1100° C. The vanadium-containing pig iron and vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for 2 hours under the condition of 30° C. and a liquid-solid ratio of 1:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical compositions of vanadium-titanium-iron concentrate are shown in table 1. The separating results of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 95.38%, and the recovery rate is up to 98.71%. The concentration of the vanadium-containing solution V.sub.2O.sub.5 is 5.2 g/L, and the recovery rate of vanadium is 90.50%. The TiO.sub.2 grade of the titanium enriched slag is 42.67%, and the recovery rate of titanium is 99.54%. The conversion and separation of iron, vanadium, and titanium from vanadium-titanium-iron concentrate are well achieved.

Embodiment 3

[0022] 100 parts of 3# vanadium-titanium-iron concentrate, 70 parts of sodium sulfate, and 40 parts of bituminous coal are well mixed. Then, the mixture is kept for half an hour in a muffle furnace at temperature of 1300° C. Vanadium-containing, pig iron and vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for half an hour under the condition of 100° C. and a liquid-solid ratio of 4:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical s of vanadium-titanium-iron concentrate are shown in table 1. The separating results of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 96.54%, and the recovery rate is up to 99.10%. The concentration of the vanadium-containing solution V.sub.2O.sub.5 is 4.5 g/L, and the recovery rate of vanadium is 88.56%. The TiO.sub.2 grade of the titanium enriched slag is 39,52%, and the recovery rate of titanium is 99.61%. The conversion and separation of iron, vanadium, and titanium from vanadium-titanium-iron concentrate are well achieved.

Embodiment 4

[0023] 100 parts of 4# vanadium-titanium-iron concentrate, 80 parts of mixture of sodium carbonate and sodium sulfate (mol(Na.sub.2CO.sub.3/NaCl)=1:1), and 40 parts of brown coal are well mixed. Then, the mixture is kept for 2 hours in a muffle furnace at temperature of 1400° C. Vanadium-containing pig iron and vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for 1 hour under the condition of 90° C. and a liquid-solid ratio of 3:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical s of vanadium-titanium-iron concentrate are shown in table 1. The separating results of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 97.38%, and the recovery rate is up to 99.85%. The concentration of the vanadium-containing solution V.sub.2O.sub.5 is 2.8 g/L, and the recovery rate of vanadium is 80.30%. The TiO.sub.2 grade of the titanium enriched slag is 46.69%, and the recovery rate of titanium is 99.74%, The conversion and separation of iron, vanadium, and titanium from vanadium-titanium-iron concentrate are well achieved.

Embodiment 5

[0024] 100 parts of 5# vanadium-titanium-iron concentrate, 50 parts of sodium hydroxide, and 30 parts of anthracite are well mixed. Then, the mixture is kept for 1 hour in a muffle furnace at temperature of 1250° C. The vanadium-containing pig iron and the vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for 3 hours under the condition of 70° C. and a liquid-solid ratio of 5:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical of vanadium-titanium-iron concentrate are shown in table 1. The separating result of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 97.02%, and the recovery rate is up to 98.60%. The concentration of the vanadium-containing solution V.sub.2O.sub.5 is 4.1 g/L, and the recovery rate of vanadium is 86.22%, The TiO.sub.2 grade of the titanium enriched slag is 48.12%, and the recovery rate of titanium is 99.73%. The conversion and separation of iron, vanadium, and titanium from vanadium-titanium-iron concentrate are well achieved.

Embodiment 6

[0025] 100 parts of 6# vanadium-titanium-iron concentrate, 70 parts of a mixture of sodium carbonate and sodium chloride (mol(Na.sub.2CO.sub.3/NaCl)=1:1), and 30 parts of coke are well mixed. Then, the mixture is kept for 2 hours in a muffle furnace at temperature of 1300° C. The vanadium-containing pig iron and the vanadium titanium enriched slag are obtained. The vanadium titanium enriched slag is crushed and finely grounded, and is leached for 1 hour under the condition of 90° C. and a liquid-solid ratio of 4:1. Filtering is conducted, after which the vanadium-containing solution and the titanium enriched slag are obtained. The chemical of vanadium-titanium-iron concentrate are shown in table 1. The separating results of the vanadium-containing pig iron, the vanadium-containing solution, and the titanium enriched slag are shown in table 2. The iron grade of the obtained vanadium-containing pig iron is 98.12%, and the recovery rate is up to 99.85%. The concentration of the vanadium-containing solution is V.sub.2O.sub.5 is 4.7 g/L, and the recovery rate of vanadium is 83.40%. The TiO.sub.2 grade of the titanium enriched slag is 40.67%, and the recovery rate of titanium is 99.01%, The conversion and separation of iron, vanadium and titanium from vanadium-titanium-iron concentrate are well achieved.

TABLE-US-00001 TABLE 1 Analysis of six vanadium-titanium-iron concentrates in the embodiments/% Ore sample number TFe TiO.sub.2 V.sub.2O.sub.5 SiO.sub.2 Al.sub.2O.sub.3 CaO MgO 1 50.28 13.12 0.53 3.07 6.17 1.04 3.77 2 37.45 28.85 1.23 12.37 2.62 6.75 0.99 3 45.38 18.58 1.52 8.66 2.56 3.27 0.88 4 55.33 8.65 0.35 4.60 4.52 2.01 0.60 5 30.06 32.47 1.03 14.37 3.02 6.95 1.29 6 59.58 6.23 1.86 2.13 2.65 1.01 0.57

TABLE-US-00002 TABLE 2 Reaction and separation results of the “one-step method” of six vanadium-titanium-iron concentrates in the embodiments Ore sample Grade/% Recovery/% number Product name TFe TiO.sub.2 V.sub.2O.sub.5 Fe TiO.sub.2 V.sub.2O.sub.5 1 Vanadium- 97.62  0.20 0.21 99.40  0.23 19.35 containing Pig iron Vanadium- — — 3.2 g/L — — 70.46 containing solution Titanium enriched  0.66 35.67 0.16  0.60 99.77 10.19 slag 2 Vanadium- 95.38  0.32 0.24 98.71  0.46 5.42 containing Pig iron Vanadium- — — 5.2 g/L — — 90.50 containing solution Titanium enriched  0.81 42.67 0.25  1.79 99.54 4.08 slag 3 Vanadium- 96.54  0.26 0.30 99.10  0.39 7.05 containing Pig iron Vanadium- — — 4.5 g/L — — 88.56 containing solution Titanium enriched  0.52 39.52 0.22  0.90 99.61 4.39 slag 4 Vanadium- 97.38  0.25 0.52 99.85  0.26 15.82 containing Pig iron Vanadium- — — 2.8 g/L — — 80.30 containing solution Titanium enriched  0.51 46.69 0.17  0.29 99.74 3.68 slag 5 Vanadium- 97.02  0.30 0.38 98.60  0.27 10.05 containing Pig iron Vanadium- — — 4.1 g/L — — 86.22 containing solution Titanium enriched  0.32 48.12 0.17  1.40 99.73 3.73 slag 6 Vanadium- 98.12  0.10 0.20 99.85  0.09 10.05 containing Pig iron Vanadium- — — 4.7 g/L — — 83.40 containing solution Titanium enriched  0.26 40.67 0.08  0.15 99.01 6.55 slag

[0026] Moreover, the present invention may also have a variety of embodiments. Artisans who are familiar with the art can make various corresponding modifications and variations based on the disclosure of the present invention without departing from the spirit and substance of the present invention. However, the corresponding modifications and variations should belong to the protective scope of the claims of the invention.