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This article will introduce three commonly used mineral processing methods for the comprehensive recovery of sulfide polymetallic ores containing lead, zinc, and silver: flotation, gravity separation-flotation, and flotation-magnetic separation.
The flotation method is widely used and has good effect in the separation process of polymetallic sulfide ores. Especially when the lead-zinc sulfide ore contains associated silver, the flotation method is often used to enrich the silver minerals into the lead concentrate. Recycle.
The mixed flotation method uses a sulfide ore collector to simultaneously flotate lead, zinc minerals and associated silver minerals to obtain lead-zinc mixed concentrates and waste tailings, and then sort the mixed concentrates to obtain single lead concentrates and zinc concentrates . If the mixed concentrate is difficult to separate or the separation effect is poor, subsequent beneficiation and separation will not be carried out, and a single metal will be obtained by smelting directly. During the separation process of lead-zinc mixed concentrate, the associated silver will be more enriched in the lead concentrate.
The gravity separation-flotation method of lead-zinc-silver polymetallic ore uses gravity separation to pre-enrich the target minerals, improve the grade of the ore when entering flotation, reduce the flotation processing volume, and thereby increase the total processing volume of the mine.
For lead-zinc sulfide ores with high silver content, the tailings can be classified first with a 0.074mm classifier, and then the two particle sizes are enriched with a shaking table. Through these two operations, part of the gangue can be discarded, reducing subsequent It reduces the cost of grinding and at the same time strengthens the enrichment of valuable elements such as lead, zinc, silver, etc., and improves the effect of subsequent flotation operations. When silver is associated with lead-zinc ore, the gravity separation-flotation combined process can improve the recovery rate of precious metal silver. That is, a tower spiral concentrator and a shaking table are first used to select coarse-grained precious metals, and then flotation is performed to recover the lead. Zinc minerals and associated silver minerals.
In view of the situation where lead-zinc-silver polymetallic ores contain magnetic minerals, it is often difficult to obtain satisfactory mineral processing indicators using only the flotation-magnetic separation process. This problem can be solved well by the combined flotation-magnetic separation process.
When the lead-zinc-silver polymetallic ore contains silver, chromium, and iron minerals, magnetic separation can be applied to the beneficiation process of the sulfide ore. Sulfide ore is flotated first, and magnetic minerals are recovered from the flotation tailings through weak magnetic separation. Multi-metallic lead-zinc-silver sulfide ore resources such as zinc, silver, chromium, and iron can be obtained. If the content of pyrrhotite in the lead-zinc-silver polymetallic ore is high, the pyrrhotite will increase the difficulty of the subsequent zinc flotation operation. Therefore, weak magnetic separation is used to remove the pyrrhotite in the ore before flotation. Iron ore, then mixed flotation of copper and lead, flotation of zinc from lead tailings, and finally independent flotation of associated silver minerals enriched in copper and lead concentrates can successfully achieve comprehensive recovery of refractory polymetallic sulfide ores.
The above are the three processes commonly used in the separation of lead, zinc, silver and lead sulfide polymetallic ores. It is recommended that when selecting a process, each mine owner should not only consider the composition of the minerals in the ore and the properties of the ore, but also choose a professional mineral processing team to customize a mineral processing plan that suits the mine conditions.
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