Scheelite concentrate to improve the quality of technology research and production practice
Guo Jianguang Lu Qingchun
Abstract: "Ninth Five during the" Beijing Research Institute of Mining and Guangzhou Research Institute of Nonferrous metal tungsten election law and new technology CF GY Shizhuyuan method for tungsten ore flotation has made a breakthrough, but In recent years, the production of ore sulfur is often higher than the design grade (the original design ore sulfur grade is only 0.5% to 0.7%, often reaches 1% to 2%), the existing sulfide ore flotation system has not fully adapted, resulting in white tungsten The sulfur content of the ore is too high. In this study, the method of reverse flotation desulfurization using BLR+pinol oil can control the sulfur in the scheelite concentrate to 0.3%-0.5%, which is a good solution to the sulfur content of the scheelite concentrate in production. Exceeded the problem.
Key words: scheelite concentrate; desulfurization; reverse flotation
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Developed "during the" float tungsten CF method and new technology law since GY trial production at our mine, and achieved satisfactory results, especially tungsten recovery rates on a higher level, so Shizhuyuan mine The recovery rate of tungsten has risen from the traditional 56% to over 67%, and a historic breakthrough has been made. The 1000t/d concentrator of Shizhuyuan Mine uses the GY method to float tungsten minerals.
Shizhuyuan ore dressing plant genus school processing solution was warmed to skarn Bonanza â…¢ ore belt, ore minerals are mainly useful in scheelite, wolframite, molybdenite, bismuthinite, fluorite and a magnetic iron ore, gangue minerals include pyrite, pyrrhotite, calcite, garnet, pyroxene and chlorite, uneven thickness distribution thereof, in varying amounts, disseminated whole fine-grained raw ore The medium sulfur content greatly exceeds the designed sulfur grade, sometimes as high as 2%, and this part of the sulfur accounts for a considerable proportion of pyrrhotite. Due to the decrease of the alkalinity of the slurry in the new tungsten-selecting process, the sulfur-containing minerals are not strongly inhibited, which makes it difficult to recover the sulfur in the sulfur-smelting system of the sulfide ore system in the main process, and finally the sulfur content of the white tungsten concentrate is high. , affecting the sales and economic benefits of the product. To this end, the technicians of our factory conducted a systematic study on the sampling of scheelite concentrate before and after GY floatation tungstic acid leaching. The test shows that tungsten in the scheelite concentrate before acid leaching is difficult to defoam and control the floating of tungsten, while acid The effect of desulfurization after immersion is better.
1 sample and medicament
The sample was obtained from a stirred tank and stirred in a white tungsten concentrate after acid leaching. The grade of scheelite was 65.35% and the sulfur content was 1.44%. The reagents used in the test were CuSO 4 , BLR, water glass and Na. 2 S, butyl xanthate and pine oil, are industrial products used in the production site, supplemented with water for on-site production water.
2 flotation test and results
2.1 Principle Process
In the principle of floating less and more, this experiment adopts the reverse flotation process. When determining the flotation scheme, it mainly considers the activation of sulfur and minimizes the loss of white tungsten id. Therefore, the sulfur is removed after acid leaching of scheelite concentrate. Process. In order to simplify the process, each scheme of the test uses an open circuit of sulphur, in order to not increase the excessive power equipment, and adjust the composition and pH of each agent in the test.
2.2 Test plan and results
Aiming at the desulfurization of scheelite concentrate and how to reduce the loss of scheelite concentrate during desulfurization, various experimental studies have been carried out. The comprehensive effects of various agents have been considered in the test. The test conditions and flotation results of each scheme are shown in the table. 1.
Table 1 Test conditions and desulfurization flotation results /% of each scheme
Program | Pharmacy and dosage (g·t -1 ) | Concentrate Yield | Concentrate grade | Tailings grade | Recovery rate | ||||
WO 3 | S | WO 3 | S | WO 3 | S | ||||
one two three four Fives six Seven | Unmedicated Na 2 S CuSO 4 Butyl xanthate CuSO 4 Butyl xanthate pH8 Na 2 S Butyl xanthate pH8 Na 2 S Butyl xanthate pH8 CuSO 4 Butyl xanthate pH 8.5 pH6 Pine oil | pH6 1600 1600 20 1500 20 1500 20 2000 20 1000 20 10 | 4.50 6.00 7.26 6.01 7.36 4.64 3.00 | 50.71 39.50 50.66 23.83 19.28 25.07 18.47 | 20.55 17.12 15.24 16.45 14.28 20.55 31.79 | 66.04 67.00 66.50 68.00 69.01 67.32 66.80 | 0.54 0.42 0.36 0.48 0.42 0.51 0.31 | 3.49 3.63 5.63 2.19 2.17 1.78 0.84 | 64.20 72.24 76.82 68.67 72.98 66.22 76.62 |
It can be seen from the results in Table 1 that the white tungsten concentrate after acid leaching can achieve a good desulfurization effect by adding a small amount of pine oil, which indicates that the sulfur has been activated in the acid leaching of the scheelite concentrate, and no sulfuric acid is needed. Copper activation and sodium sulfide induction, on the contrary, the addition of copper sulfate and sodium sulfide will increase the yield of sulfur concentrate and increase the loss of white tungsten. Therefore, the key to desulfurization is to control the content of white tungsten in sulfur concentrate, in order to control the growth of white tungsten. The amount and further increase the sulfur effect to ensure that the white tungsten loss is minimized in industrial production and the sulfur content of the white tungsten concentrate is less than 0.5%. The desulfurization test is carried out using water glass and BLR as a regulator. The amount of pine oil is 10g. /t, the flotation results are shown in Table 2. The amount of the modifier in Table 2 is the optimum amount for the conditional test.
Table 2 Adjusting agent desulfurization flotation test results /%
Adjusting agent and dosage / (g·t -1 ) | Yield | Concentrate grade | Tailings grade | Recovery rate | ||||
WO 3 | S | WO 3 | S | WO 3 | S | |||
Water glass BLR | 2000 200 | 3.50 3.00 | 38.61 16.59 | 29.56 38.30 | 66.32 68.41 | 0.42 0.30 | 2.07 0.74 | 71.85 89.90 |
It can be seen from the results in Table 2 that the addition of BLR is beneficial to reduce the content of scheelite in the sulfur concentrate and significantly improve the desulfurization effect, and the effect is much better than that of the water glass regulator. From the flotation process, after adding BLR, the sulfur flotation process is more stable, and the sulfur floatation speed is faster, so the desulfurization process of BLR plus pine alcohol oil is finally selected.
3 production practice
According to the results of small-scale tests, combined with the on-site production situation of our factory, a simple and economical BLR plus pine oil desulfurization process was used for on-site trial production. The trial production uses two-slot 5A flotation machine for open-circuit flotation. After one month of trial production, a total of 150 tons of qualified scheelite concentrate was produced, and the impurity sulfur content was 0.2% to 0.5%. The problem of excessive sulfur content in the scheelite concentrate on site has been solved. The process has been transferred to industrial production and has achieved good economic benefits. Before adopting this process, the sulfur content of scheelite concentrate is 1.1% on average, and the qualification rate of scheelite concentrate is only 20%. After adopting this process, the impurity content of sulphur concentrate is 0.4%, scheelite concentrate The pass rate is 100%, the net added value per ton of scheelite concentrate is 1,500 yuan, and the annual economic benefit is 1 million yuan.
4 Conclusion
Through the laboratory and on-site production practice, the reverse flotation desulfurization process of white tungsten concentrate with BLR and pine oil is simple and reasonable, which basically solves the problem of excessive sulfur content in the white tungsten concentrate, and technically it is high sulfur in the persimmon garden. The further improvement of the new tungsten process under the original ore CF method and the GY method has significant economic benefits.
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