Cyanide-free and chromium-free copper lead flotation separation method

Abstract

The invention provides a cyanide-free and chromium-free copper lead flotation separation method which is characterized in that copper lead bulk flotation is realized by adopting a combined collector of ethyl thio carbamate +Z-200 which has better selectivity and collecting force according to raw ore properties of and process mineralogy characteristics of copper lead sulphide ore; bulk flotation concentrate is subjected to thickening, regrinding and thickening deep dereagent, and sodium sulphide and activated carbon are added in the regrinding process to strengthening the dereagent effect; in the copper lead separation process, sodium sulphite, zinc sulfate and carboxymethylcellulose combined inhibitor are adopted to restrict lead and float copper; The process is mainly implemented through three process links including raw ore copper lead bulk flotation, multi-mean strengthening dereagent, bulk concentrate copper lead separation; the method adopts the technological process of copper lead bulk flotation-multi-mean strengthening dereagent-cyanide-free and chromium-free copper lead separation and has an obvious effect in treatment of complex copper lead sulfide ore and similar ore; the copper grade of obtained copper concentrate is greater than 32%, the copper recovery rate is greater than 65%, the lead grade of lead concentrate is greater than 49%, and the lead recovery rate is greater than 88%.

Description

1. Technical field [0001] The invention relates to the smelting industry, in particular to a copper-lead polymetallic ore beneficiation method, in particular to a cyanide-free, chromium-free copper-lead flotation separation method. 2. Background technology [0002] With the acceleration of the industrialization of mineral processing, limited mineral resources have been developed on a large scale, and improving resource utilization and energy conservation and environmental protection have become the subject of today. [0003] The ore composition of copper-lead polymetallic sulfide ore is complex, and the copper-lead minerals coexist, intersect or wrap each other, with fine particle size and complex structure. In addition, the natural buoyancy of copper and lead minerals is similar, so it is difficult to separate them by flotation. Because copper minerals and lead minerals have similar floatability, copper-lead sulfide ore flotation often produces a copper-lead mixed concentr...

AI Technical Summary

Problems solved by technology

Cyanide has a strong inhibitory effect on copper minerals, while galena has almost no inhibitory effect, so the effect of inhibiting copper and floating lead is very good, but its disadvantage is that the cyanide used is highly toxic and will cause serious damage to the environment. Pollution, and will dissolve the gold and silver in the ore and the copper sulfide minerals

Potassium dichromate method is used to suppress lead floating copper, which has the advantages of small dosage of chemicals and stable production operation, but dichromate ion is extremely difficult to handle and will cause serious pollution to the environment

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