Technology of enhanced-dispersion partial selective and bulk flotation of lead and zinc sulfide ores under low and high alkalinity

Abstract

The invention discloses a technology of enhanced-dispersion partial selective and bulk flotation of lead and zinc sulfide ores under low and high alkalinity. During grading of the lead and zinc sulfide ores, sodium hexametahposphate is taken as a dispersion agent and directly added into a ball mill, the ores are ground till the ores with the size of 0.074mm account for 67%-70%, lime is taken as an adjusting agent, zinc sulfate and sodium sulfite are taken as inhibitors, dithiophosphate BA and diethyldithiocarbamate are taken as collectors, and selective flotation of part of lead minerals with good floatability can be performed under low alkalinity; then xanthate and the diethyldithiocarbamate are taken as collectors, and the flotation of the lead minerals is further performed under high alkalinity; copper sulfate is added in lead flotation tailings for activation, butyl xanthate is further taken as the collector for flotation of zinc blende and part of pyrite, and zinc-sulfur separation flotation is further performed on zinc-sulfur mixed concentrate; and sulfuric acid is added in zinc flotation tailings for activation, and the xanthate is taken as the collector for flotation of the remaining pyrite. By adopting the technology, the lead-silver recovery rate can be improved, the using amount of lime and sulfuric acid can be reduced, the circulating amount of middlings can be reduced, the ore dressing cost can be reduced and the grade of the concentrate can be improved.

Description

technical field [0001] The invention relates to the enhanced dispersion low-high alkalinity partial preferential mixed flotation technology of lead-zinc sulfide ore, which is a lead-zinc sulfide ore sorting technology. Background technique [0002] Lead-zinc sulfide ore is an important material for lead-zinc smelting in my country. It is usually associated with lead-zinc minerals (galena and sphalerite), and there are also rare and precious metals such as silver, indium, germanium, and gallium. Comprehensive recovery needs to be considered during the smelting process. One of the characteristics of lead-zinc sulfide ore in my country is low lead, high zinc and high sulfur. Through mineral processing operations, three products of lead concentrate, zinc concentrate and sulfur concentrate can be obtained. Rare and precious metals are enriched in different degrees in the three concentrate products. , so as to be comprehensively recycled. At present, the most commonly used separat...

AI Technical Summary

Problems solved by technology

The advantage of this process technology is that the process is simple and easy to operate, but it also has the following disadvantages: (1) In the high alkalinity environment in the lead selection operation, although pyrite and sphalerite are effectively suppressed, it is beneficial to improve the lead concentration. ore grade, but some silver minerals are also suppressed, reducing the recovery rate of precious metals (<55%)

At the same time, if the ore contains part of the brittle pyrostibite that is easy to float, this mineral is also inhibited at high alkalinity, thereby reducing the recovery rate of lead

(2) When there is a lot of mud (including primary slime and secondary slime), the dispersibility of the pulp is poor in a high alkalinity environment, the separation index of lead is greatly affected, and the recovery rate is low ( <65%)

(3) There is a phenomenon of "strong pressure and strong pull" in the whole process. In the priority selection of lead, lime and zinc sulfate are used to strongly inhibit pyrite and sphalerite. In the zinc selection operation, more copper sulfate needs to be added to activate Sphalerite; in sulfur separation operations, it is necessary to add more sulfuric acid to activate pyrite

As a result, the consumption of chemicals is large, the amount of medium ore circulation is large, and the follow-up operation equipment is prone to calcium sulfate scaling and other problems.

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