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Induced Enrichment of Rare and Precious Metals

     

The method comprises the following steps:

(1) Mechanically crush rare and precious metal-bearing slag materials, add slagging agents and low-value metals, and mix thoroughly to obtain feedstock;

(2) Feed the said feedstock into a pyrometallurgical furnace for smelting, and separate the smelted products to obtain precious metal alloy and smelting slag;

(3) Cool the said precious metal alloy via a combined cooling mode integrating natural cooling and forced water cooling, then conduct mechanical crushing and beneficiation separation to obtain precious metal concentrate and tailings respectively; the tailings are returned to the low-value metal storage for reuse;

(4) The said precious metal concentrate can be sold directly, or sent to the precious metal extraction process for separation and purification of precious metals.

By selecting low-value metals that are readily available for mining and metallurgical enterprises, and leveraging their physicochemical properties as well as adjusting the mixing ratio of raw materials, enrichment of target metals through pyrometallurgical smelting can be achieved. Meanwhile, the by-products can be reused or stockpiled as general solid waste, without causing secondary environmental pollution.

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