Platinum refining process based on two-stage sedimentation method

Abstract

The invention discloses a platinum refining process based on a two-stage sedimentation method. The platinum refining process comprises the following steps: (1), hydrazine hydrate reduction, wherein platinum concentrate is added with water for pulpifying and heating up to 50 DEG C+ / -5 DEG C, and hydrazine hydrate is added for reducing ammonium chloroplatinate into crude platinum; (2), aqua regia dissolving, wherein the filtered-out crude platinum is placed into a glass cup and added with water for pulpifying, and the aqua regia is added for dissolving until the platinum is completely dissolved; (3), first-stage non-oxidation platinum depositing-boiling to dissolve palladium, wherein liquor is controlled to contain 50g / l platinum, heated up to 60 DEG C, added with NH4C1 to deposit platinum, heated and boiled after the reaction is ended, and filtered and washed after being cooled; (4), second-stage oxidization platinum-palladium depositing, wherein the first-stage palladium-depositing filtrate is heated up to 60 DEG C, added with ammonium chloride and sodium chlorate in a ratio f 10:1 to deposit platinum and palladium, cooled, filtered and washed after the reaction is ended; (5), ammonifying and palladium dissolving, wherein the first-stage platinum salt and the second-stage platinum salt obtained by filtering are respectively pulpified by using pure water; (6), roasting, wherein the platinum salt placed in a porcelain crucible is heated and roasted in a muffle furnace, and taken out for being washed and dried after being slowly cooled.

Description

technical field [0001] The invention relates to a refined platinum process, in particular to a two-stage deposition method refined platinum process. Background technique [0002] The most common methods for platinum refining in metallurgy are: 1. Repeated precipitation of ammonium chloride. 2. Sodium bromate hydrolysis method. [0003] In the traditional ammonium chloride precipitation method, in the process of depositing platinum salt, it is first necessary to pass chlorine gas or add an oxidant to keep platinum and palladium in a high valence state, and they are deposited together, making separation difficult. High equipment requirements, high energy consumption, and difficult operation. [0004] The sodium bromate hydrolysis method is to use sodium bromate as an oxidant to keep the platinum ions in the solution in a high valence state, control the appropriate Ph value, and make the rhodium, iridium and various noble and base metals in the solution hydrolyze as soon as p...

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is: aiming at the platinum-extracting raw material with high palladium content, the ammonium chloride precipitation method platinum-palladium separation difficulty in the existing refining platinum process, high to equipment requirement, energy consumption is big, operation difficulty is big; Bromic acid Palladium exceeds the standard in the sodium hydrolysis method, and the direct yield is low

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