Study on New Chemicals for Copper and Molybdenum Separation
Xiang Ping Liu Jianguo Deng Weiying Xu Linkun Gu Yu
Abstract: A new copper-molybdenum separation process using TS agent to suppress copper molybdenum was proposed and studied. The new process uses low inhibitors and good sorting effect, and can replace the Na 2 S copper-inhibiting process to achieve efficient and economical flotation separation of copper-molybdenum mixed concentrate.
Key words: TS; Na 2 S; copper-molybdenum sorting
A mine is a large copper production base in China, and it is also a large-scale molybdenum mine. The mine has inhibited the selection of molybdenum from copper-molybdenum mixed concentrate by Na 2 S method for many years. The production practice shows that there is a large amount of chemicals in the process (according to statistics 1998). The annual consumption of Na 2 S is as high as 70.24kg/t, the production cost is high, and the environmental pollution in the workshop is serious. Because Na 2 S is easily oxidized and failed in the slurry, it causes large dosage, frequent production fluctuations, poor index stability, and the workload and labor intensity of transportation, storage, preparation and addition of chemicals. The workshop is seriously polluted. Therefore, the mine has proposed a new topic of high-efficiency copper-suppressing agents that can significantly reduce the amount of chemicals and the cost of molybdenum.
Zhuzhou Beneficiation Pharmacy Factory has developed a new high-efficiency copper-suppressing agent TS for copper-molybdenum sorting, and carried out research on new copper-molybdenum sorting process using TS as copper inhibitor. The results show that the new method of TS copper-molybdenum sorting uses a low amount of inhibitors, and the sorting effect is good. It can replace the Na 2 S sorting process and realize efficient and economical flotation separation of copper-molybdenum mixed concentrate.
1 TS Pharmacy
The novel high-efficiency copper inhibitor TS is a composite agent composed of an organic component A having a plurality of hydrophilic and hydrophilic functional groups and another inorganic salt component B having strong reducibility. The main features are as follows:
(1) TS agent in the pulp is selectively adsorbed on the surface of brass and pyrite, these minerals is inhibited strongly hydrophilic. Figure 1 is a graph showing the copper inhibition performance of Na 2 S and TS as inhibitors in a segmented bubble flotation test. It can be seen that TS does not deteriorate in copper in a short time like Na 2 S. The effective copper suppression time of 4.8kg/t TS (about 32min) exceeds that of 50kg/t Na 2 S. Effective copper suppression time (18min).
(2) The A component of the TS agent has a certain odor and a weakly corrosive type. The acute oral LD 50 of the female and male Kunming mice were 1470 mg/kg·bw and 1710 mg/kg·bw, respectively, which were low toxicants. After standing for a long time in the air, the component A is easily oxidized and does not cause cumulative toxicity in the environment. The B component of the TS agent is non-toxic and tasteless, and has stable storage performance in a dry and cool environment, but its aqueous solution is easily oxidized and fails. Therefore, TS should be used with it.
Figure 1 TS and Na 2 S copper inhibition performance curve
1-Na 2 S 20kg/t; 2-Na 2 S 50kg/t; 3-TS 4.8kg/t
2 test mineral properties
The test ore sample was taken from a mine selective molybdenum workshop, which was a copper-molybdenum mixed concentrate. The test contained molybdenum containing about 0.47% and copper containing about 26.5%. The molybdenum mineral is mainly molybdenum ore, and the copper mineral is mainly chalcopyrite. Another contain minor amounts of pyrite, chalcocite, tetrahedrite, tennantite and bornite minerals and metals like quartz, mica, easy to float gangue minerals. The sample has a fine particle size and generally accounts for more than 90% of -74 μm. The results of the particle size analysis of the samples are shown in Table 1.
Table 1 sample size analysis and metal distribution rate measurement results /%
Size/μm | Yield | Grade | Metal distribution rate | ||
Mo | Cu | Mo | Cu | ||
+200 -200+150 -150+74 -74+50 -50+38 -38 total | 2.57 2.67 1.83 3.98 8.58 80.37 100.0 | 0.53 0.55 0.36 0.31 0.43 0.51 0.494 | 26.76 26.83 24.15 23.70 24.43 27.29 26.82 | 2.75 2.97 1.32 2.49 7.53 82.94 100.0 | 2.56 2.67 1.65 3.52 7.82 81.78 100.0 |
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3 TS molybdenum test study
3.1 rough selection section condition test
Molybdenum binding site characteristic points in two stages, the first excerpt of the rough amount of TS, pulp density, and the amount of water glass dosage kerosene series flow test conditions according to Figure 2. The optimization conditions are: slurry concentration 28%, rough selection TS dosage 5kg/t, selected TS dosage 0.45kg/t, water glass dosage 10kg/t. The change of kerosene dosage within 200g/t has no effect on the index.
Figure 2 rough selection section condition test procedure
3.2 rough selection closed circuit process test
For the optimization conditions, the closed-loop process tests were carried out in two rough selections, one selection, one sweep and two rough selections, two selections, and one sweeping process. The test results are shown in Table 2. The amount of TS is 5.45kg/t, which is 45~50kg/t in the coarse selection compared with Na 2 S in Na 2 S. The amount of TS is only 1/8 to 1/9 of Na 2 S, but 0.44% for molybdenum. The copper-molybdenum mixed concentrate of the left and right is obtained. The crude concentrate contains 11.66% molybdenum and the molybdenum recovery rate is 86.69%. After two times of selection, the coarse concentrate contains 16.93% of molybdenum and the molybdenum recovery rate is 81.22%.
Table 2 Closed-circuit test results of TS molybdenum rough selection section /%
Process structure | Product name | Yield | Grade | Recovery rate | ||
Mo | Cu | Mo | Cu | |||
Two rough selections One time selection One sweep | Raw ore Molybdenum concentrate Tailings | 100.0 3.24 96.76 | 0.436 11.66 0.066 | 26.80 17.91 27.17 | 100.0 86.69 13.31 | 100.0 2.16 97.84 |
Two rough selections Two selections One sweep | Raw ore Molybdenum concentrate Tailings | 100.0 2.12 97.88 | 0.442 16.93 0.085 | 27.10 14.72 27.44 | 100.0 81.22 18.78 | 100.0 1.15 98.85 |
3.3 full process closed circuit test
Simulated on-site molybdenum selection process, the rough selection section was twice rough selection, one selection, one sweep, coarse concentrate re-grinding to fineness -38μm accounted for 90%, and then five selected TS sorting copper The whole process closed-circuit test of molybdenum, the test results are shown in Table 3. TS Total amount of 6.45kg / t, as compared to Na 2 Na 2 S S total amounts Method 65 ~ 75kg / t, TS Na 2 S amount is only an amount of 1/10 to 1/12. For the molybdenum about 0.47% copper The molybdenum mixed concentrate obtained the excellent selection index of the final molybdenum concentrate containing 48.53% of molybdenum, 1.09% of copper and 80.94% of molybdenum recovery.
Table 3 full process closed circuit test results /%
Product name | Yield | Grade | Recovery rate | ||
Mo | Cu | Mo | Cu | ||
Raw ore Molybdenum concentrate Copper concentrate | 100.0 0.79 99.21 | 0.474 48.53 0.091 | 27.23 1.09 27.41 | 100.0 80.94 19.06 | 100.0 0.03 99.97 |
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4 field application
4.1 Fresh mineral pulp sample laboratory verification test
In the mine selection molybdenum workshop, take the fresh ore slurry of copper-molybdenum mixed concentrate, and carry out the laboratory verification test of the rough selection section of TS and Na 2 S according to the flow and conditions of Figure 3. The test results are shown in Table 4. The test shows that the total amount of TS is 4.5. A similar sorting effect was obtained with a total amount of kg/t and Na 2 S of 39.6 kg/t.
Figure 3 fresh mineral slurry sample verification test process
Table 4 Fresh mineral pulp sample verification test results /%
Inhibitor And dosage | Product | Yield | Grade | Recovery rate |
Mo | Mo | |||
Na 2 S 39.6kg/t | Raw ore Concentrate Medium mine Concentrate + mine Tailings | 100.0 1.62 8.90 10.52 89.48 | 0.467 23.68 0.691 4.23 0.024 | 100.0 82.21 13.81 95.39 4.61 |
TS 4.5kg/t | Raw ore Concentrate Medium mine Concentrate + mine Tailings | 100.0 1.53 11.24 12.77 87.23 | 0.465 25.13 0.49 3.442 0.029 | 100.0 82.71 11.85 94.56 5.44 |
4.2 coarse selection section industrial application debugging indicators
See Table 5 for the industrial application commissioning indicators of the TS agent instead of Na 2 S in the rough selection section of the molybdenum workshop.
Table 5 rougher segment with Na 2 S TS Comparative debugging industrial applications index /%
Inhibitor | Inhibitor unit consumption /(kg·t -1 ) | Raw ore grade | Coarse concentrate grade | Tailings grade | Recovery rate | ||||
Mo | Cu | Mo | Cu | Mo | Cu | Mo | Cu | ||
TS Na 2 S | 6.21 50 | 0.315 0.325 | 24.09 23.00 | 9.92 9.78 | 15.79 16.70 | 0.040 0.046 | 24.33 23.18 | 87.68 86.17 | 1.82 2.08 |
5 conclusion
The TS inhibitor used in the TS copper-molybdenum sorting process is selectively adsorbed on the surface of minerals such as chalcopyrite in the slurry to make the mineral hydrophilic and inhibited. Compared with the Na 2 S method, the amount of the TS inhibitor is low, the sorting effect obtained is good, the toxicity is low, the pollution is light, and the workload and labor intensity for transportation, storage, preparation, and addition are low. Efficient and economical flotation separation of copper-molybdenum mixed concentrate can be achieved by replacing Na 2 S with TS.
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