A method for efficiently enriching platinum and palladium from low concentration platinum palladium nitric acid system solution

A low-concentration, platinum-palladium technology, applied in the direction of improving process efficiency, can solve the problems of small sediment particles, low platinum-palladium concentration, incomplete recovery, etc., and achieve high filtration rate, good selectivity, and good precipitation effect Effect
CN111850300BActive Publication Date: 2021-10-12WESTERN MINING CO LTD +2
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WESTERN MINING CO LTD
Publication Date
2021-10-12

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Abstract

The invention discloses a method for efficiently enriching platinum and palladium from a low-concentration platinum-palladium nitric acid system solution. By adjusting the pH of the nitric acid system solution, adding complexing agent A and then adding regulator B after two stages of temperature control reaction, the reaction ends Finally, a platinum-palladium complex precipitate is obtained, and then the precipitate is calcined to remove organic matter to obtain a platinum-palladium concentrate. Separation of platinum and palladium is achieved by nitric acid leaching, nitric acid removal, and filtration. Add NH to the filtrate 4 Cl and KClO 3 Obtain a red precipitate, add ammonia water to the red precipitate to dissolve and filter, then add HCl to obtain a yellow precipitate, then dissolve the yellow precipitate with ammonia water, and then add a reducing agent to obtain palladium sponge. Dissolve the platinum concentrate with aqua regia, and add NH to the solution after filtration 4 Cl, a precipitate is obtained, and the precipitate is slurried and reduced to obtain a coarse platinum powder. It solves the problems of incomplete recovery when the concentration of platinum and palladium is low, high impurity content, difficulty in enriching platinum and palladium, small precipitate particles, slow filtration, etc., and has the advantages of efficient enrichment of platinum and palladium, high product purity, and high recovery efficiency.
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Description

technical field

[0001] The invention relates to the technical field of comprehensive recovery of precious metals, in particular to a method for efficiently enriching platinum and palladium from a low-concentration platinum-palladium nitric acid system solution. Background technique

[0002] Platinum palladium noble metal has strong catalytic activity, and is an indispensable catalytic material for industrial waste gas purification, petrochemical industry, fine chemical industry, fuel cell manufacturing, organic chemical industry, etc. The industry prospect is very broad. my country has always been the world's largest consumer of platinum group metals, but at present, domestic platinum group metal resources are seriously scarce and its deposit types are complex, and the situation that a large amount of platinum group metals need to be imported needs to be improved urgently. The main raw materials for platinum and palladium recovery are copper anode slime, lead anode slime, an...

Claims

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