Method for separating platinum, palladium, rhodium and iridium from solution
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A solution and filtrate technology, applied in the field of chemical industry and metallurgy, can solve the problems of large waste water and liquid, incomplete separation, cumbersome process, etc., and achieve the effect of small amount of waste water, high direct recovery rate and short process flow
Pending Publication Date: 2022-07-12
HOOTECH
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[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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Embodiment 1
[0022] Purify 500L of precious metal solutions containing precious metals platinum, palladium, rhodium and iridium for separation. The raw material data are shown in Table 1. The precious metal solution containing the precious metals of platinum, palladium, rhodium and iridium is transferred to the reaction kettle, heated to 50-60°C, and chlorine gas is introduced to fully oxidize for 12h. After the oxidation was completed, keep the solution at 50-60°C and quickly add 61.6 kg of ammonium chloride to precipitate the precious metal. After the precipitation is completed, the reaction kettle is water-cooled to 40-50° C., and ammonium chloroplatinate, ammonium chloropalladate, ammonium chlororhodium, and amine chloroiridate are filtered out. The filter residue was washed with 17% NH4Cl solution at pH 1 until the washing water was colorless. Precipitate tails were tested. The tail fluid data are shown in Table 2. From the data, the precipitation rates of precious metals are all ...
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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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