Method for Separating Calcite-rich Low-grade Fluorite Barite Paragenic Ore

Abstract

A method for separating a calcite-rich low-grade fluorite barite paragenic ore, includes the following steps: S1, crushing; S2, performing classification on a crushed ore to obtain a fine-grained ore, a medium-grained ore and a coarse-grained ore; S3, performing jigging gravity separation on the medium-grained ore and the coarse-grained ore to obtain first barite concentrates and jigging tailings; S4, performing color sorting on the jigging tailings to obtain calcite minerals and color sorting tailings; S5, combining the fine-grained ore and the color sorting tailings, and then performing ore grinding to obtain feeding materials in flotation; S6, performing flotation on the feeding materials in flotation to obtain fluorite concentrates and flotation tailings; S7, performing chute gravity separation on the flotation tailings to obtain second barite concentrates and chute tailings. The method achieves an effect of obtaining high-quality acid-grade fluorite concentrates (CaF.sub.2≥98%).

Claims

1. A method for separating a calcite-rich low-grade fluorite barite paragenic ore, comprising the following steps: S1, crushing a raw ore to obtain a crushed ore; S2, performing a classification on the crushed ore to obtain a fine-grained ore, a medium-grained ore and a coarse-grained ore; S3, performing a jigging gravity separation on the medium-grained ore and the coarse-grained ore to obtain first barite concentrates and jigging tailings; S4, performing a color sorting on the jigging tailings to obtain calcite minerals and color sorting tailings; S5, combining the fine-grained ore and the color sorting tailings, and then performing an ore grinding to obtain feeding materials in flotation; S6, performing a flotation on the feeding materials in flotation to obtain fluorite concentrates and flotation tailings; S7, performing a chute gravity separation on the flotation tailings to obtain second barite concentrates and chute tailings.

2. The method according to claim 1, wherein a particle size of the fine-grained ore is less than or equal to 1 mm.

3. The method according to claim 2, wherein a particle size of the crushed ore is less than or equal to 20 mm.

4. The method according to claim 3, wherein a particle size of the coarse-grained ore is more than 8 mm.

5. The method according to claim 2, wherein a particle size of the crushed ore is less than or equal to 15 mm.

6. The method according to claim 5, wherein a particle size of the coarse-grained ore is more than 5 mm.

7. The method according to claim 1, in the S6, the jigging gravity separation comprises the following steps: 1) performing the jigging gravity separation on the medium-grained ore to obtain medium-grained concentrates and first tailings; 2) performing the jigging gravity separation on the coarse-grained core to obtain coarse-grained concentrates and second tailings; 3) combining the medium-grained concentrates and the coarse-grained concentrates to obtain the first barite concentrates; combining the first tailings and the second tailings to obtain the jigging tailings.

8. The method according to claim 1, wherein in the S4, the jigging tailings are drained until a water content of less than 5% before proceeding the color sorting.

9. The method according to claim 1, wherein in the S5, a percentage by weight of a mineral with a particle size of less than or equal to 0.074 mm in the feeding materials in flotation is 75% to 85%.

10. The method according to claim 1, wherein in the S6, the flotation comprises at least two times of roughing and at least five times of clearing.

11. The method according to claim 1, wherein in the S6, an inhibitor is added for the flotation; the inhibitor comprises acidized water glass, fulvic acid and sodium naphthalene sulfonate.

12. The method according to claim 11, wherein a mass ratio of the acidized water glass to the fulvic acid to the sodium naphthalene sulfonate is (1-2):(1-2):(2-3).

13. The method according to claim 11, wherein a usage amount of the inhibitor is 1000-2000 g/t•feeding materials in flotation.

14. The method according to claim 1, wherein in the S7, the chute gravity separation comprises at least one time of roughing, at least one time of scavenging, and at least one time of clearing.

15. The method according to claim 12, wherein a usage amount of the inhibitor is 1000-2000 g/t•feeding materials in flotation.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0053] FIGURE is a flow chart of a method for separating a calcite-rich low-grade fluorite barite paragenic ore according to the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0054] The technical solutions of the preset invention will be described in detail below, but the protection scope of the present invention is not limited to the following description.

Example 1

[0055] A calcite-rich low-grade fluorite barite paragenic ore was provided. The raw ore mainly contained 19.83 wt % CaF.sub.2, 63.42 wt % BaSO.sub.4 and 7.15 wt % CaCO.sub.3. The separation method was shown in the FIGURE and included the following steps:

[0056] S1, performing two-stage crushing on a raw ore with a jaw crusher and a cone crusher to obtain a crushed ore with a particle size of less than or equal to 20 mm;

[0057] S2, performing classification on the crushed ore to obtain a fine-grained ore with a particle size of less than or equal to 1 mm and a coarse-grained ore with a particle size of more than 8 mm, and the remaining was a medium-grained ore;

[0058] S3, performing jigging gravity separation on the medium-grained ore using a fine-grain jigger at a stroke of 10 mm and jig frequency of 320 times/min to obtain medium-grained concentrates and tailings I;

[0059] S4, performing jigging gravity separation on the coarse-grained ore using a coarse-grain jigger at a stroke of 15 mm and jig frequency of 350 times/min to obtain coarse-grained concentrates and tailings II;

[0060] S5, combining the medium-grained concentrates and coarse-grained concentrates to obtain barite concentrates I containing 90.23 wt % BaSO.sub.4, 2.15 wt % CaF.sub.2 and 3.11 wt % CaCO.sub.3; and combining the tailings I and tailings II to obtain jigging tailings containing 23.83 wt % CaF.sub.2, 56.23 wt % BaSO.sub.4 and 9.35 wt % CaCO.sub.3;

[0061] S6, draining the jigging tailings until the water content was less than 5%, and then performing color sorting to obtain calcite minerals containing 32.03 wt % CaCO.sub.3, 8.20 wt % CaF.sub.2 and 35.35 wt % BaSO.sub.4, and color sorting tailings containing 26.77 wt % CaF.sub.2, 60.17 wt % BaSO.sub.4 and 5.67 wt % CaCO.sub.3;

[0062] S7, performing combined grinding of the fine-grained ore and color sorting tailings to obtain feeding materials in flotation, wherein the percentage by weight of the minerals with a particle size of less than or equal to 0.074 mm was 82.00%;

[0063] S8, adding a 1% calcite and barite inhibitor and a fluorite collecting agent to the feeding materials in flotation for fluorite flotation to obtain fluorite concentrates containing 98.15 wt % CaF.sub.2, 0.71 wt % BaSO.sub.4 and 0.68 wt % CaCO.sub.3, and floatation tailings containing 4.22 wt % CaF.sub.2, 78.23 wt % BaSO.sub.4 and 6.59 wt % CaCO.sub.3, wherein the flotation process included two times of roughing and five times of clearing, the total usage amount of the inhibitor was 1800 g/t•feeding materials in flotation; the calcite and barite inhibitor was a mixture of acidized water glass, fulvic acid and sodium naphthalene sulfonate with a mass ratio of 1:1:2, and the fluorite collecting agent was commercially available oleic acid;

[0064] S9, performing chute gravity separation on flotation tailings, with concentration of ore pulp of 25 wt %, to obtain barite concentrates II containing 92.87 wt % BaSO.sub.4, 1.57 wt % CaF.sub.2 and 2.09 wt % CaCO.sub.3, and chute tailings containing 9.58 wt % CaF.sub.2, 48.50 wt % BaSO.sub.4 and 13.88 wt % CaCO.sub.3, wherein the chute gravity separation process included one time of roughing, one time of scavenging and one time of clearing.

Example 2

[0065] A calcite-rich low-grade fluorite barite paragenic ore was provided. The raw ore mainly contained 24.36 wt % CaF.sub.2, 58.15 wt % BaSO.sub.4 and 8.13 wt % CaCO.sub.3. The separation method was shown in the FIGURE and included the following steps:

[0066] S1, performing two-stage crushing on a raw ore with a jaw crusher and a cone crusher to obtain a crushed ore with a particle size of less than or equal to 15 mm;

[0067] S2, performing classification on the crushed ore to obtain a fine-grained ore with a particle size of less than or equal to 1 mm and a coarse-grained ore with a particle size of more than 5 mm, and the remaining was a medium-grained ore;

[0068] S3, performing jigging gravity separation on the medium-grained ore using a fine-grain jigger at a stroke of 12 mm and jig frequency of 340 times/min to obtain medium-grained concentrates and tailings I;

[0069] S4, performing jigging gravity separation on the coarse-grained ore using a coarse-grain jigger at a stroke of 20 mm and jig frequency of 370 times/min to obtain coarse-grained concentrates and tailings II;

[0070] S5, combining the medium-grained concentrates and coarse-grained concentrates to obtain barite concentrates I containing 88.21 wt % BaSO.sub.4, 2.85 wt % CaF.sub.2 and 3.46 wt % CaCO.sub.3; and combining the tailings I and tailings II to obtain jigging tailings containing 29.62 wt % CaF.sub.2, 49.37 wt % BaSO.sub.4 and 10.32 wt % CaCO.sub.3;

[0071] S6, draining the jigging tailings until the water content was less than 5%, and then performing color sorting to obtain calcite minerals containing 34.03 wt % CaCO.sub.3, 10.02 wt % CaF.sub.2 and 28.92 wt % BaSO.sub.4, and color sorting tailings containing 33.39 wt % CaF.sub.2, 53.31 wt % BaSO.sub.4 and 5.76 wt % CaCO.sub.3;

[0072] S7, performing combined grinding of the fine-grained ore and color sorting tailings to obtain feeding materials in flotation, wherein the percentage by weight of the minerals with a particle size of less than or equal to 0.074 mm was 78.00%;

[0073] S8, adding a 3% calcite and barite inhibitor and a fluorite collecting agent to the feeding materials in flotation for fluorite flotation to obtain fluorite concentrates containing 98.56 wt % CaF.sub.2, 0.65 wt % BaSO.sub.4 and 0.52 wt % CaCO.sub.3, and floatation tailings containing 4.06 wt % CaF.sub.2, 77.04 wt % BaSO.sub.4 and 7.79 wt % CaCO.sub.3, wherein the flotation process included two times of roughing and five times of clearing, the total usage amount of the inhibitor was 1200 g/t•feeding materials in flotation; the calcite and barite inhibitor was a mixture of acidized water glass, fulvic acid and sodium naphthalene sulfonate with a mass ratio of 1:1:2, and the fluorite collecting agent was commercially available oleic acid;

[0074] S9, performing chute gravity separation on flotation tailings, with concentration of ore pulp of 28 wt %, to obtain barite concentrates II containing 90.12 wt % BaSO.sub.4, 2.10 wt % CaF.sub.2 and 3.13 wt % CaCO.sub.3, and chute tailings containing 8.33 wt % CaF.sub.2, 48.50 wt % BaSO.sub.4 and 17.97 wt % CaCO.sub.3, wherein the chute gravity separation process included one time of roughing, one time of scavenging and two times of clearing.

Example 3

[0075] A calcite-rich low-grade fluorite barite paragenic ore was provided. The raw ore mainly contained 22.56 wt % CaF.sub.2, 59.35 wt % BaSO.sub.4 and 8.65 wt % CaCO.sub.3. The separation method was shown in the FIGURE and included the following steps:

[0076] S1, performing two-stage crushing on a raw ore with a jaw crusher and a cone crusher to obtain a crushed ore with a particle size of less than or equal to 15 mm;

[0077] S2, performing classification on the crushed ore to obtain a fine-grained ore with a particle size of less than or equal to 1 mm and a coarse-grained ore with a particle size of more than 5 mm, and the remaining was a medium-grained ore;

[0078] S3, performing jigging gravity separation on the medium-grained ore using a fine-grain jigger at a stroke of 13 mm and jig frequency of 350 times/min to obtain medium-grained concentrates and tailings I;

[0079] S4, performing jigging gravity separation on the coarse-grained ore using a coarse-grain jigger at a stroke of 22 mm and jig frequency of 380 times/min to obtain coarse-grained concentrates and tailings II;

[0080] S5, combining the medium-grained concentrates and coarse-grained concentrates to obtain barite concentrates I containing 88.65 wt % BaSO.sub.4, 2.35 wt % CaF.sub.2 and 3.75 wt % CaCO.sub.3; and combining the tailings I and tailings II to obtain jigging tailings containing 27.37 wt % CaF.sub.2, 50.77 wt % BaSO.sub.4 and 11.07 wt % CaCO.sub.3;

[0081] S6, draining the jigging tailings until the water content was less than 5%, and then performing color sorting to obtain calcite minerals containing 36.12 wt % CaCO.sub.3, 8.86 wt % CaF.sub.2 and 29.16 wt % BaSO.sub.4, and color sorting tailings containing 31.44 wt % CaF.sub.2, 55.52 wt % BaSO.sub.4 and 5.56 wt % CaCO.sub.3;

[0082] S7, performing combined grinding of the fine-grained ore and color sorting tailings to obtain feeding materials in flotation, wherein the percentage by weight of the minerals with a particle size of less than or equal to 0.074 mm was 80.00%;

[0083] S8, adding a 3% calcite and barite inhibitor and a fluorite collecting agent to the feeding materials in flotation for fluorite flotation to obtain fluorite concentrates containing 98.32 wt % CaF.sub.2, 0.69 wt % BaSO.sub.4 and 0.58 wt % CaCO.sub.3, and floatation tailings containing 4.31 wt % CaF.sub.2, 77.92 wt % BaSO.sub.4 and 7.38 wt % CaCO.sub.3, wherein the flotation process included two times of roughing and five times of clearing, the total usage amount of the inhibitor was 1250 g/t•feeding materials in flotation; the calcite and barite inhibitor was a mixture of acidized water glass, fulvic acid and sodium naphthalene sulfonate with a mass ratio of 1:1:2, and the fluorite collecting agent was commercially available oleic acid;

[0084] S9, performing chute gravity separation on flotation tailings, with concentration of ore pulp of 30 wt %, to obtain barite concentrates II containing 90.03 wt % BaSO.sub.4, 1.98 wt % CaF.sub.2 and 3.01 wt % CaCO.sub.3, and chute tailings containing 9.00 wt % CaF.sub.2, 53.50 wt % BaSO.sub.4 and 16.20 wt % CaCO.sub.3, wherein the chute gravity separation process included one time of roughing, one time of scavenging and two times of clearing.

Example 4

[0085] A calcite-rich low-grade fluorite barite paragenic ore was provided. The raw ore mainly contained 20.98 wt % CaF.sub.2, 60.35 wt % BaSO.sub.4, and 5.89 wt % CaCO.sub.3. The separation method was shown in the FIGURE and included the following steps:

[0086] S1, performing two-stage crushing on a raw ore with a jaw crusher and a cone crusher to obtain a crushed ore with a particle size of less than or equal to 20 mm;

[0087] S2, performing classification on the crushed ore to obtain a fine-grained ore with a particle size of less than or equal to 1 mm and a coarse-grained ore with a particle size of more than 8 mm, and the remaining was a medium-grained ore;

[0088] S3, performing jigging gravity separation on the medium-grained ore using a fine-grain jigger at a stroke of 15 mm and jig frequency of 350 times/min to obtain medium-grained concentrates and tailings I;

[0089] S4, performing jigging gravity separation on the coarse-grained ore using a coarse-grain jigger at a stroke of 20 mm and jig frequency of 400 times/min to obtain coarse-grained concentrates and tailings II;

[0090] S5, combining the medium-grained concentrates and coarse-grained concentrates to obtain barite concentrates I containing 89.83 wt % BaSO.sub.4, 2.15 wt % CaF.sub.2 and 3.41 wt % CaCO.sub.3; and combining the tailings I and tailings II to obtain jigging tailings containing 25.60 wt % CaF.sub.2, 50.58 wt % BaSO.sub.4 and 7.17 wt % CaCO.sub.3;

[0091] S6, draining the jigging tailings until the water content was less than 5%, and then performing color sorting to obtain calcite minerals containing 25.52 wt % CaCO.sub.3, 8.01 wt % CaF.sub.2 and 30.58 wt % BaSO.sub.4, and color sorting tailings containing 29.57 wt % CaF.sub.2, 55.10 wt % BaSO.sub.4 and 3.03 wt % CaCO.sub.3;

[0092] S7, performing combined grinding of the fine-grained ore and color sorting tailings to obtain feeding materials in flotation, wherein the percentage by weight of the minerals with a particle size of less than or equal to 0.074 mm was 82.00%;

[0093] S8, adding a 5% calcite and barite inhibitor and a fluorite collecting agent to the feeding materials in flotation for fluorite flotation to obtain fluorite concentrates containing 98.10 wt % CaF.sub.2, 0.75 wt % BaSO.sub.4 and 0.45 wt % CaCO.sub.3, and floatation tailings containing 3.90 wt % CaF.sub.2, 76.53 wt % BaSO.sub.4 and 4.32 wt % CaCO.sub.3, wherein

[0094] the flotation process included two times of roughing and five times of clearing, the total usage amount of the inhibitor was 1300 g/t•feeding materials in flotation; the calcite and barite inhibitor was a mixture of acidized water glass, fulvic acid and sodium naphthalene sulfonate with a mass ratio of 1:1:2, and the fluorite collecting agent was commercially available oleic acid;

[0095] S9, performing chute gravity separation on flotation tailings, with concentration of ore pulp of 32 wt %, to obtain barite concentrates II containing 91.12 wt % BaSO.sub.4, 1.76 wt % CaF.sub.2 and 2.18 wt % CaCO.sub.3, and chute tailings containing 8.31 wt % CaF.sub.2, 46.44 wt % BaSO.sub.4 and 8.74 wt % CaCO.sub.3, wherein the chute gravity separation process included one time of roughing, one time of scavenging and two times of clearing.

Comparative Example 1

[0096] The various indicators for separating a calcite-rich low-grade fluorite barite paragenic ore in Example 1 of the present invention were compared with those in Comparative Example 1, wherein the raw ore in Example 1 was used in Comparative Example 1, and the separation method was the technical solution described in Chinese patent CN201510202332.2 (this Comparative Example was compared with the prior art to prove that the separation method of the present invention was more effective).

Comparative Example 2

[0097] The various indicators for separating a calcite-rich low-grade fluorite barite paragenic ore in Example 1 of the present invention were compared with those in the Comparative Example 2, wherein the raw ore in Example 1 was used in the Comparative Example 2, and the separation method was as follows: steps S3 to S5 were excluded, and S6 in Example 1 was changed to “directly performing color sorting on the medium-grained ore and the coarse-grained ore, to obtain calcite mineral and color-sorting tailings; and other conditions such as the usage amount of reagents, fineness of grinding and a subsequent technological process, etc. were the same as those in Example 1 of the present invention (this Comparative Example was compared with that with no jigging gravity separation step, to prove that the separation method of the present invention was more effective).

Comparative Example 3

[0098] The various indicators for separating a calcite-rich low-grade fluorite barite paragenic ore in Example 1 of the present invention were compared with those in the Comparative Example 3, wherein the raw ore in Example 1 was used in the Comparative Example 3, and the separation method was as follows: step S6 was excluded, and S7 in Example 1 was directly changed to “performing combined grinding of the fine-grained ore and jigging tailings, to obtain feeding materials in flotation”; and other conditions such as the usage amount of reagents, fineness of grinding and a subsequent technological process, etc. were the same as those in Example 1 of the present invention (this Comparative Example was compared with that with no color sorting step, to prove that the separation method of the present invention was more effective).

Comparative Example 4

[0099] The various indicators for separating a calcite-rich low-grade fluorite barite paragenic ore in Example 1 of the present invention were compared with those in the Comparative Example 4, wherein the raw ore in Example 1 was used in the Comparative Example 4, and the separation method was as follows: the inhibitor was replaced as dextrin sulfonated phenanthrene, tannic acid, sodium humate, etc. of the prior art; and other conditions such as the usage amount of reagents, fineness of grinding and a subsequent technological process, etc. were the same as those in Example 1 of the present invention (this Comparative Example used the prior art inhibitor, to prove that the inhibitor used in the present invention had more effective separation effect).

[0100] Test Effect

[0101] 1. In order to verify the effect of the separation method of the present invention, the yields, grades and recovery rates of minerals separated from Examples 1 to 4 and Comparative Examples 1 to 4 were tested. The results were shown in the table below.

TABLE-US-00001 Grade Recovery Rate Group Product Name Yield CaF.sub.2 BaSO.sub.4 CaCO.sub.3 CaF.sub.2 BaSO.sub.4 CaCO.sub.3 Example 1 Fluorite 16.64 98.15 0.71 0.68 82.36 0.19 1.58 concentrates Barite 20.15 2.15 90.23 3.11 2.18 28.67 8.76 concentrates I Barite 35.59 1.57 92.87 2.09 2.82 52.12 10.4 concentrates II Calcite 10.1 8.2 35.35 32.03 4.18 5.63 45.25 mineral chute tailings 17.52 9.58 48.5 13.88 8.46 13.4 34.01 Raw ore 100 19.83 63.42 7.15 100 100 100 Example 2 Fluorite 21.08 98.56 0.65 0.52 85.29 0.24 1.35 concentrates Barite 19.88 2.85 88.21 3.46 2.33 30.16 8.46 concentrates I Barite 33.35 2.1 90.12 3.13 2.88 51.69 12.84 concentrates II Calcite 10.41 10.02 28.92 34.03 4.28 5.18 43.57 mineral chute tailings 15.28 8.33 48.5 17.97 5.23 12.75 33.78 Raw ore 100 24.36 58.15 8.13 100 100 100 Example 3 Fluorite 19.28 98.32 0.69 0.58 84.01 0.22 1.29 concentrates Barite 20.23 2.35 88.65 3.75 2.11 30.10 8.77 concentrates I Barite 32.73 1.98 90.03 3.01 2.87 49.46 11.39 concentrates II Calcite 11.53 8.86 29.16 36.12 4.53 5.64 48.15 mineral chute tailings 16.23 9.00 53.50 16.20 6.48 14.57 30.40 Raw ore 100 22.56 59.58 8.65 100.00 100.00 100.00 Example 4 Fluorite 18.02 98.10 0.75 0.45 84.25 0.22 1.38 concentrates Barite 21.05 2.15 89.83 3.41 2.16 31.33 12.19 concentrates I Barite 33.23 1.76 91.12 2.18 2.79 50.17 12.30 concentrates II Calcite 11.59 8.01 30.58 25.52 4.43 5.87 50.23 mineral chute tailings 16.11 8.31 46.44 8.74 6.38 12.40 23.91 Raw ore 18.02 20.98 60.35 5.89 100.00 100.00 100.00 Comparative Fluorite 16.95 95.89 1.150 1.68 82.17 0.31 3.90 Example 1 concentrates Barite 55.79 3.21 89.950 3.56 9.05 79.00 27.21 concentrates Calcite 27.26 6.37 48.21 18.45 8.78 20.69 68.89 mineral Raw ore 100 19.78 63.520 7.30 100.00 100.00 100.00 Comparative Fluorite 16.35 97.45 0.950 0.71 81.08 0.24 1.59 Example 2 concentrates Barite 45.82 2.18 90.120 3.08 5.08 64.63 19.33 concentrates Calcite 13.23 8.51 38.190 30.25 5.73 7.91 54.82 mineral chute tailings 24.60 6.47 70.69 7.20 8.10 27.22 24.25 Raw ore 100 19.65 63.890 7.30 100.00 100.00 100.00 Comparative Fluorite 16.43 96.15 0.680 1.85 81.57 0.17 4.17 Example 3 concentrates Barite 20.08 2.52 90.520 3.15 2.63 28.59 8.72 concentrates I Barite 36.13 2.05 91.890 3.52 3.85 52.22 17.54 concentrates II chute tailings 27.45 8.39 44.05 18.37 11.95 19.02 69.56 Raw ore 100 19.26 63.580 7.25 100.00 100.00 100.00 Comparative Fluorite 16.38 96.18 1.320 1.25 79.09 0.34 2.70 Example 4 concentrates Barite 19.95 2.01 90.930 2.98 2.01 28.80 7.84 concentrates I Barite 36.02 1.85 92.380 2.55 3.35 52.83 12.12 concentrates II Calcite 10.25 8.32 35.120 32.59 4.28 5.72 44.07 mineral chute tailings 17.40 12.91 44.53 14.49 11.27 12.30 33.27 Raw ore 100 19.92 62.980 7.58 100.00 100.00 100.00

[0102] As shown from the above table, in the Comparative Example 1, as compared with Example 1, the yield of fluorite concentrates has no significant change, but the grade and recovery rate of CaF.sub.2 thereof are significantly reduced; and the yield of barite concentrates have no significant change, but the grade and recovery rate of BaSO.sub.4 are significantly reduced.

[0103] In Comparative Example 2, the yield of fluorite concentrates has no significant change, but the grade and recovery rate of CaF.sub.2 thereof are significantly reduced; and the yield of barite concentrates, the grade and recovery rate of BaSO.sub.4 are significantly reduced, indicating that the jigging gravity separation could improve the grade and recovery rate of CaF.sub.2 in the fluorite concentrates, the yield of barite concentrates and the grade and recovery rate of BaSO.sub.4 therein.

[0104] In Comparative Example 3, the yield of fluorite concentrates has no significant change, but the grade and recovery rate of CaF.sub.2 thereof are significantly reduced; and the yield of barite concentrates and the recovery rate of BaSO.sub.4 are significantly reduced, while the grade of BaSO.sub.4 has no significant change, indicating that the color sorting could improve the grade and recovery rate of CaF.sub.2 in the fluorite concentrates, the yield of barite concentrates and the recovery rate of BaSO.sub.4 therein.

[0105] In Comparative Example 4, the yield of fluorite concentrates has no significant change, but the grade and recovery rate of CaF.sub.2 thereof are significantly reduced; and the yield of barite concentrates, the grade and recovery rate of BaSO.sub.4 have no significant change, indicating that the inhibitor of the present invention could improve the grade and recovery rate of CaF.sub.2 in the fluorite concentrates.

[0106] 2. In order to verify the effect of recycling of water for beneficiation of the present invention, a comparative test was carried out. The test included an experimental group, a control group A and a control group B, wherein the yields, grade of CaF.sub.2 and recovery rate of CaF.sub.2 of the feeding materials in flotation, the obtained fluorite concentrates and the flotation tailings were tested respectively; wherein, in the experimental group, the water for beneficiation obtained in Example 1 was used for flotation separation, in the control group A, clear water was used for flotation separation, and in the control group B, the water for beneficiation obtained in the Comparative Example 1 was used for flotation separation. The flotation separation method was the same as that of Example 1. The results are shown in the table below.

TABLE-US-00002 Recovery Grade of Rate of Group Product Name Yield CaF.sub.2 CaF.sub.2 Experimental Fluorite concentrates 29.68 98.1 90.96 group Flotation tailings 70.32 4.11 9.04 Flotation feed 100.00 32.01 100.00 Control Fluorite concentrates 28.78 98.52 90.41 group A Flotation tailings 71.22 4.22 9.59 Flotation feed 100.00 31.36 100.00 Control Fluorite concentrates 28.65 95.38 83.87 group B Flotation tailings 71.35 7.20 16.13 Flotation feed 100.00 32.58 100.00

[0107] As shown in the above table, as compared with control group A, the yield of fluorite concentrates, and the grade and recovery rate of CaF.sub.2 obtained in the experimental group have no significant change; in the control group B, the yield of the obtained fluorite concentrates has no significant change, but the grade and recovery rate of CaF.sub.2 therein are reduced significantly. Therefore, the recycling of the water for beneficiation in the prior art would significantly reduce the grade and recovery rate of CaF.sub.2 in the fluorite concentrates; however, the water for beneficiation in the present invention could be recycled, and effect thereof is not significantly different from that of clear water.

[0108] In summary, by the method for separating a calcite-rich low-grade fluorite barite paragenic ore of the present invention, high-quality acid-grade fluorite concentrates and barite concentrates can be obtained, and the flotation backwater can be recycled.

The foregoing description only describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as an exclusion of other embodiments, but can be used in various other combination, modification and environment. The description can be modified through the above teaching or technology or knowledge in related fields within the scope of the concept described herein. The modification and change without departing from the spirit and scope of the present invention made by those skilled in the art should fall within the scope of protection of the appended claims of the present invention.