Enrichment: re-election enrichment of platinum mineral is the main method. Platinum ore of relative density is bigger, use the chute, jig, shaking table and the enrichment of air cleaning can be effectively. Natural natural gold, platinum and surface wettability is small, with xanthate flotation collector. Get concentrate after enrichment.
Refining: traditional refining methods to dissolve, reduction, precipitation and calcine. Platinum ore concentrate dissolved in aqua regia, platinum, palladium and gold in solution, with ferrous sulfate reduction from the solution of gold, then through electrolysis can be of pure gold. To join in solution of ammonium chloride, the platinum with chloroplatinic acid precipitation, ammonium by calcining crude platinum, refined by sodium bromate hydrolysis method. Dissolution and precipitation of traditional processing long and complex, incomplete separation of metal, it is hard to get high purity products. Low metal recovery rate and high cost. In 1970, began to appear in the extraction process, with the mixture of cl2 / HCl medium, the nationalisation of the precious metal leaching, improved separation efficiency and shortened the processing time, ensure to obtain high purity products. So, the modernization of platinum refining processes are based on the solvent extraction.
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From:Chemical Reagent
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