Method for separating platinum, palladium, rhodium and iridium from solution

Abstract

The invention relates to a method for separating platinum, palladium, rhodium and iridium from a solution, which comprises the following steps: adding a strong oxidant, and then adding a saturated ammonium chloride solution, so that platinum, palladium, rhodium and iridium form chloroplatinic acid amine, chloropalladic acid amine, chlororhodic acid amine and chloroiridic acid amine precipitates; adding ammonia water for slurrying, heating and stirring, and enabling palladium salt to enter the solution; the filtrate is palladium liquid, and the filter residues are ammonium chloroplatinate, ammonium chlororhodate and ammonium chloroiridate. And refining the palladium liquid to recover palladium. The method comprises the following steps: adding water into ammonium chloroplatinate, ammonium chlororhodate and ammonium chloroiridate salt slag, slurrying, heating, adding hydrazine hydrate, reducing platinum and rhodium into simple substances, reducing tetravalent iridium salt into trivalent iridium salt, adjusting the acidity of the solution, transferring the iridium salt into the solution, and refining the iridium liquid to recover iridium. The filter residues are platinum and rhodium powder, drying, dissolving with hydrochloric acid and hydrogen peroxide, transferring platinum into a solution, filtering, and transferring platinum liquid into refining; the filter residue is crude rhodium, and refining to obtain rhodium powder. The invention provides a method for separating complex precious metal materials, and solves the problems of incomplete separation, large amount of wastewater and waste liquid in separation, complicated process, high cost and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical metallurgy, and in particular relates to a method for rapidly separating platinum, palladium, rhodium and iridium from a solution in an environment-friendly and efficient manner. Background technique [0002] After the precious metal is enriched and made into a solution, the solution often contains precious metal elements such as platinum, palladium, rhodium, and iridium. The previous process is generally only for one kind of precious metal, complex material, imperfect process route, and low separation yield. In production, to improve separation efficiency and increase yield, it is necessary to change the original separation method. The original separation methods are mostly extraction, resin exchange, precipitation and so on. The extraction method is often faced with large differences in each batch of materials, and the extraction is difficult to carry out continuously. In the process of extra...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for separating platinum, palladium, rhodium and iridium from the solution, which is environmentally friendly, efficient and rapid, and the overall technological process is environmentally friendly and short, and can solve the separation of complex precious metal solutions similar to platinum, palladium, rhodium and iridium. Incomplete, large waste water and waste liquid, cumbersome process, high cost and other problems, the whole process is carried out in an orderly manner, the separation effect of platinum, palladium, rhodium, iridium is good, and the direct recovery rate is high

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