The single flotation process currently established in a large mine in Yunnan can only produce copper- lead mixed concentrate, which cannot achieve copper-lead separation. The separate system of copper and lead separation during beneficiation will cause large investment and serious impact on production. In response to this situation, the research on the flotation separation of copper-lead mixed concentrates was carried out with the aim of finding an effective process technology to build a small flotation plant to separate copper and lead from the mixed concentrate produced by the existing system and improve the product. Added value.
The test sample contains 8.22% copper, 28.87% lead and 11.36% zinc . Experimental Study more parties, sodium sulfide final drug removal, transfer sulfate pulp, sodium thiosulfate, ferrous sulfate in combination with inhibitors of [1] inhibition lead float copper, successfully effective separation of copper and lead, the metallurgical performance is obtained as follows: Copper The recovery rate of concentrate copper is 90.66%, the concentrate grade is 20.01%, the lead content is 2.66%, the zinc content is 3.46%, the lead concentrate recovery rate is 96.56%, the concentrate grade is 45.51%, the copper content is 1.27%, and the zinc content is 16.55%.
First, the nature of the sample
The ore sample is a copper-lead mixed concentrate produced by a mine in Yunnan. The fineness of the sieve is -741xm, 95%, and -45μm, 81.2%. Metal ore minerals in sulfide minerals, the main mineral chalcopyrite, galena, sphalerite, pyrite, chalcocite, etc., is also associated with gold silver and other rare metals, ore multi-element analysis The results are shown in Table 1.
Table 1 Multi-element analysis results of ore samples%
Second, flotation test research
The test work was carried out in the laboratory. The test equipment was: XMB-67 type 200-240 rod mill, XFD-3L coarse sweep flotation machine, XFD-1.5L and 1.0L selected flotation machine.
(1) Selection of deionization methods for mixed concentrates
Since the ore sample is a mixed concentrate obtained after sulfur suppression and mixed selection, the flotation agent added during the mixed selection is partially present in the mineral. Therefore, the part of the agent must be removed before the copper-lead separation test, combined with the ore properties. In the study, the test was carried out using sodium sulfide. After careful investigation, the current drug-removal methods include agitation and drug removal, re-grinding and de-druging, and warming and de-druging. [Three methods, comparative analysis of test results, re-grinding method can achieve better drug-removal effect, and then grind fineness - When 451μm is 95% and sodium sulfide is 9000g/t, the separation effect of copper and lead is ideal.
(2) Copper and lead separation agent dosage test
The traditional separation of copper and lead are often used to achieve a weight of chromium potassium inhibition lead floating copper [2], or copper cyanide to achieve suppression of floating, since these methods can cause environmental pollution, the Government is currently prohibited in production. To this end, this test uses sodium sulfide detoxification, sulfuric acid slurry, sodium thiosulfate and ferrous sulfate combination inhibitor to suppress lead float copper, the specific agent dosage test results are as follows.
1, sulfuric acid dosage test
The test results of sulfuric acid dosage are shown in Fig. 1. The test results show that when the amount of sulfuric acid is more than 3680g/t, the inhibitory effect on lead is worse, but the addition of sulfuric acid is beneficial to improve the copper grade and recovery rate. The suitable sulfuric acid dosage is 3680g/t. At this time, the pulp pH is 5.5.
Figure 1 Sulfuric acid dosage test results
2, sodium thiosulfate dosage test
The test results of sodium thiosulfate dosage are shown in Fig. 2. The test results show that when the amount of sodium thiosulfate is more than 1200g/t, the indexes of copper and lead are adversely affected, but the inhibition effect on lead is not good when it is less than 1200g/tt. Therefore, a suitable amount of sodium thiosulfate is 1200 g/t.
Figure 2 results of sodium thiosulfate dosage test
3, ferrous sulfate dosage test
The test results of ferrous sulfate dosage are shown in Fig. 3. The test results show that the increase of ferrous sulfate dosage will increase the recovery rate of copper and increase the grade of lead in tailings. When the amount of ferrous sulfate reaches 5000g/t, it can be obtained. Good copper lead separation effect.
Figure 3 results of ferrous sulfate dosage test
4, butyl yellow medicinal amount test results
The results of the butyl yellow medicinal amount test are shown in Fig. 4. The recovery rate of lead in the copper coarse concentrate is about 30% after using the butyl yellow drug with strong absorption, and the recovery rate of copper is improved. The dosage is 60 g/t.
Figure 4 butyl yellow medicinal test results
(3) Selected I dosage test
Mainly carried out the selected I dosage test, the best dosage of the selected I was: 800g/t sulfuric acid (pH 6.3 at this time), sodium thiosulfate 600g/t, ferrous sulfate 1600g/t , butyl xanthate 30, pine oil 5g / t.
(4) Closed circuit test
The closed circuit test process is shown in Figure 5, and the test results are shown in Table 2.
Figure 5 Copper-lead separation closed-circuit test procedure
Table 2 Copper and lead separation closed circuit test results%
Third, the conclusion and discussion
1. According to the characteristics of the mixed concentrate, through the comparison of various schemes, the combination of inhibitors for copper and lead separation test can achieve the purpose of copper and lead separation, and can obtain ideal sorting index to achieve effective copper and lead. Separation.
2, the use of sodium sulfide detoxification, sulfuric acid slurry, and ferrous sulfate combination inhibitor for copper and lead separation, efficiency, and environmental protection is very good. Sodium thiosulfate is not only very
3. The test results show that the flotation process system is convenient and simple to implement, and the mineral processing agents used are all conventional flotation reagents, which are easier to implement in production.
4. Since the content of zinc in the ore is not high, it is difficult to separate qualified concentrate products by sorting, so this test has not been separated.
references
[1] Ai Guanghua, Zhu Yichun, Wei Zongwu.Experimental study on combined inhibitors in copper-lead separation and flotation[J].China Mine Engineering,2005(5):11-12,16.
[2] Qin Yongqi, Zhang Wenhua. Experimental study on beneficiation process of a lead-zinc mine[J].Journal of Hydrometallurgy,2004(6):98-100.
[3] Qiu Tingsheng, Luo Xianping, Chen Weihua, et al. Experimental study on improving lead and zinc beneficiation index of Huidong lead-zinc mine[J]. 金属金属,2004(9):34-36.
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