Understanding of the copper sulfide zinc ore sorting process
Disseminated ore often has brass-like solid solutions or emulsions in sphalerite, the monomer dissociation easily, even reaching monomer dissociation, such small particles (less often 0.005mm) separation is very difficult; More commonly, sphalerite is activated by copper ions in symbiotic copper minerals (especially secondary copper sulfide minerals) in the ore, so that sphalerite exhibits similar floatability to copper minerals to varying degrees; The sphalerite is more buoyant than chalcopyrite. Therefore, the sorting of copper sulfide zinc ore is difficult.
Copper sulfide zinc ore flotation method
(1) Principle flow of copper sulfide zinc ore flotation. Commonly used are preferential flotation, semi-priority (easy float copper mineral) mixing (refractory copper and zinc minerals) separation flotation, partial mixing flotation, and other flotation, among which semi-priority mixing separation flotation and The flotation process is more suitable for ore with large differences in floatability of copper or zinc minerals. As far as the number of grinding and floating sections is concerned, for the copper-zinc ore which is difficult to separate due to dense symbiosis, the stage grinding and refining process of mixed concentrate regrind, coarse concentrate regrind or medium ore regrind is adopted.
(2) Copper and zinc separation methods. The separation of copper-zinc mixed concentrate is a difficult subject. Before the separation, it is necessary to use activated carbon and sodium sulfide to remove the drug, preferably after dehydration, re-slurry and then separate.
Separation process schemes include float copper and zinc and copper and copper, depending on the proportion of copper and zinc in ore (or mixed concentrate), the difference in mineral floatability, and the source and use of the drug, especially based on The final indicator to decide. Generally used float copper zinc suppression program.
The separation scheme is either cyanide or cyanide. When the copper mineral is mainly a primary copper mineral, the most widely used cyanide-free separation method is lime + sodium sulfide + zinc sulfate, lime + zinc sulfate decahydrate (or sodium sulfite), and the lime + cyanide method is limited. When copper was mainly secondary copper sulfide, medium soda may ferricyanide 3 ~ 6kg / t of copper floating suppressing zinc oxide concentrate may be mixed, the slurry was warmed to inhibit floating of secondary copper minerals zinc.
The most common method for reducing arsenic in copper concentrate is to increase the number of selections, add lime, sulfurous acid (or its salt) in the selection, control pH 6.5 to 7, multiple selections and inhibitions, and lose the arsenopyrite. (or lower) floatability.
In the flotation of copper sulphide ore, many sites strive to use selective collectors such as Z-200, ether thioester (collector 234), JF-1, butyl sulphate, etc. Minerals, which save both inhibitors and better sorting indicators.
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