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A process for purifying and refining platinum from platinum stripping solution

A stripping liquid and process technology, applied in the field of platinum refining, can solve the problems of low product yield, low production efficiency, long operation cycle, etc., and achieve the effect of simple process flow, convenient operation and short production cycle

Active Publication Date: 2017-10-03
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is aimed at the disadvantages of conventional platinum refining process, such as complex process, low production efficiency, long operation cycle, low direct product yield, etc. To provide a process for purifying and refining platinum from platinum stripping solution with simple process, short flow process, high yield and stable product quality

Method used

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  • A process for purifying and refining platinum from platinum stripping solution
  • A process for purifying and refining platinum from platinum stripping solution
  • A process for purifying and refining platinum from platinum stripping solution

Examples

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Embodiment 1

[0020] Concentrate 8L of the platinum back-extraction solution produced by vitamin-extraction separation of platinum group metals (S201 extraction and separation of palladium, N235 extraction of platinum) to 2L, the platinum concentration is 50g / L, adjust the pH of the solution to 0.5, add 430g of chloride after boiling Ammonium until the supernatant is taken and ammonium chloride is added until no precipitation occurs, and the platinum precipitation is detected completely. After being kept in a boiling state for 10 minutes, it is cooled and filtered. The filter residue is crude platinum ammonium salt. The filter residue is washed with ammonium chloride solution until the washing liquid is pH 6. Combine the filtrate and washing solution and add zinc and magnesium powder to comprehensively recover precious metals. After washing, the crude platinum ammonium salt (wet weight 516g) is boiled and washed with 1mol / L nitric acid solution. The mass ratio of crude ammonium platinumate to...

Embodiment 2

[0024] Concentrate 700L of platinum back-extraction solution produced by vitamins-extraction separation of platinum group metals (S201 extraction and separation of palladium, N235 extraction of platinum) to 170L, the platinum concentration is 60g / L, adjust the pH of the solution to 1, add 38kg of chloride after boiling Ammonium until the supernatant is taken and ammonium chloride is added until no precipitation occurs, and the platinum precipitation is detected completely, kept in a boiling state for 10 minutes, then cooled and filtered, the filter residue is crude platinum ammonium salt, and the filter residue is washed with ammonium chloride solution until the washing liquid pH=7 , the filtrate and washing liquid were combined and added with zinc and magnesium powder to comprehensively recover precious metals. After washing, the crude platinum ammonium salt (wet weight 53.4kg) was washed with 1.5mol / L nitric acid solution, and the mass ratio of crude platinum ammonium salt to ...

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Abstract

The invention discloses a process for purifying and refining platinum from stripping solution of N235 extraction platinum. The process comprises the following steps: platinum group metal-contained liquid is settled with platinum by ammonium chloride to generate coarse platinum ammonium salt through platinum stripping solution generated by S201 extraction separation palladium and the N235 extraction platinum; and the coarse platinum ammonium salt is cooked and washed by nitric acid, cooked and washed by ammonium chloride solution, reduced by hydrazine dihydrochloride and dried in vacuum to generate a sponge platinum product accordant with the national standards. The process is convenient for operation, reasonable in joint of all procedures and short in production period. The process is adopted to enable the yield of whole refining process to reach 93-95%. The process is simple in flow, high in yield of noble metal and capable of preventing the noble metal from dispersing to the greatest extent. Compared with a traditional aqua regia dissolving-ammonium chloride repeated precipitation method, the process effectively solves the difficulty that nitric oxides are difficult to qualify for emission; and meanwhile, such problems as high labor intensity, low production efficiency and bad operation environment in the operation of dissolving and dispelling nitride by aqua regia can be eliminated.

Description

technical field [0001] The invention belongs to the technical field of platinum refining, and in particular relates to a process for purifying and refining platinum from a platinum back-extraction solution produced by extracting and separating palladium with S201 and extracting platinum with N235. Background technique [0002] At present, after separating platinum palladium and rhodium iridium, the platinum palladium concentrate is made liquid and then separated by S201 extraction to separate palladium and N235 to extract platinum. If only the palladium extraction process is carried out, the palladium extraction residue is directly connected to the platinum refining process, although the base metal elements are under control. , but the precious metal elements in the produced platinum products still exceed the standard, the platinum refining production cycle is long, and the selective removal effect on the remaining base metals is poor. [0003] In the process of separating p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 潘从明张发志谢振山郭晓辉王立李进武
Owner JINCHUAN GROUP LIMITED