With the deepening of mining depth, nature of the ore Huili Zinc Mine changed greatly, mainly reflected in a sharp rise in copper grade, copper-lead-zinc multi-form metal complex sulphide ore. In order to maintain and improve the existing lead and zinc beneficiation indicators, copper metal is recovered to form an independent copper concentrate product, and the high-efficiency development and utilization of mineral resources can be realized to improve the high copper and sulfur in the deep ore body of the Huizhi zinc mine. Experimental study on comprehensive beneficiation index of lead-zinc ore. To this end, the laboratory small-scale experiments mainly studied the copper-lead mixed-copper-lead separation-re-floating zinc scheme and the copper-lead-zinc sequential preferential flotation scheme.
I. Copper-lead mixed float-copper-lead separation-zinc solution
According to the results of the exploration test, the test was first carried out on the copper-lead mixed float-lead-lead separation-zinc scheme, and the closed-circuit process test was carried out on the basis of the conditional test. The test results are shown in Table 1.
Table 1 Copper-lead mixed flotation-copper-lead separation-zinc direct flotation scheme small closed-circuit test index/%
Second, copper-lead-zinc priority flotation scheme
According to the exploratory test results of copper collectors , it was found that both BK-301 and LP-01 can be used as collectors for copper during copper-lead-zinc preferential flotation. Therefore, the test first performed on BK-301 and LP-01. Contrast. The results of the comparative test are shown in Table 2.
Table 2 BK-301 and LP-01 comparison test results /%
It can be seen from Table 2 that LP-O1 is superior to BK-301 in terms of copper grade and copper recovery. Therefore, in the copper-lead-zinc preferential flotation scheme, the collector of copper is LP-01. . After determining the type of collector for copper, the test also explored the pharmaceutical system and process parameters during lead and zinc flotation, and conducted a closed-circuit process test based on the conditional test. The test results are shown in Table 3.
Table 3 Results of the closed-circuit test of the copper-lead-zinc preferential flotation of the zinc ore
Comparing the "copper-lead mixed-copper-lead separation-re-floating zinc" scheme with the "copper-lead-zinc sequential preferential flotation" scheme, although both copper concentrates can be obtained, "copper-lead mixed-copper-lead separation" The separation of copper-lead from the copper-lead mixed concentrate obtained by flotation in the re-floating zinc scheme is difficult, and the environmentally unfriendly K 2 CrO 7 is used to inhibit lead minerals, and the copper-lead separation effect is also poor. The high content of lead and zinc in the copper concentrate obtained also affects the recovery rate of lead and zinc. The use of "copper-lead-zinc in order to optimize flotation" not only obtains relatively good quality copper, lead and zinc concentrates, but also has simple chemicals, easy operation, and easy on-site process modification. It is recommended to consider this scheme for copper lead. Zinc polymetallic sulfide ore is subjected to comprehensive beneficiation recovery.
According to the test results, the copper-lead-zinc in the Huili zinc mine was preferentially floated, and the process was modified to add a copper series. Industrial applications in which copper-lead-zinc is followed by a preferred flotation process are initiated. Industrial application results are shown in Table 4.
Table 4 Copper-lead-zinc sequential priority flotation process industrial application results /%
It can be seen from Table 4 that the copper-lead-zinc sequential preferential flotation process can obtain copper concentrate with lead content of 21.47% and corresponding copper recovery rate of 56.88% without affecting the lead and zinc index.
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