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Platinum refining process

A technology, ammonium chloroplatinate technology, applied in the field of platinum refining technology, can solve the problems of high labor intensity, time-consuming operation, long process flow, etc.

Inactive Publication Date: 2019-01-18
JINGCHU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process has the problems of long process flow, time-consuming operation and high labor intensity, and a large amount of corrosive gas is generated during the calcination of ammonium chloroplatinate, and harmful nitrogen oxide gas is easily generated during the dissolution process of aqua regia, and the removal of nitrate is not complete. It will cause a series of shortcomings such as palladium exceeding the standard in platinum sponge products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A platinum refining process, comprising the steps of:

[0027] Step 1. Slurry 6kg of crude ammonium chloroplatinate with 42L of deionized water to form a slurry, heat the slurry to 90°C, then add 0.6kg of analytically pure sodium metabisulfite under stirring conditions, keep the temperature and continue to stir the reaction Until the yellow ammonium chloroplatinate is completely dissolved;

[0028] Step 2: Cool the first reaction solution obtained from the reaction in step 1 to room temperature and then filter, heat the filtrate obtained by filtration to 90°C, and then add 4.17L of analytically pure hydrochloric acid and 0.6kg of analytically pure sodium chlorate under stirring conditions , continue to stir and keep warm for 20 minutes until no yellow ammonium chloroplatinate is precipitated;

[0029] Step 3, add 0.6kg of analytically pure ammonium chloride to it after cooling the second reaction liquid obtained by the reaction in step 2, stir to obtain 5.97kg ammonium...

Embodiment 2

[0031] A platinum refining process, comprising the steps of:

[0032] Step 1. Slurry 5kg of crude ammonium chloroplatinate with 40L deionized water to form a slurry, heat the slurry to 93°C, then add 0.75kg of analytically pure sodium metabisulfite under stirring conditions, keep the temperature and continue to stir the reaction Until the yellow ammonium chloroplatinate is completely dissolved;

[0033] Step 2. Cool the first reaction solution obtained in step 1 to room temperature and then filter it. Heat the filtrate obtained by filtration to 93° C., then add 5.85 L of analytically pure hydrochloric acid and 0.75 kg of analytically pure sodium chlorate under stirring conditions. , continue to stir and keep warm for 37 minutes until no yellow ammonium chloroplatinate is precipitated;

[0034] Step 3, add 0.75kg of analytically pure ammonium chloride to it after cooling the second reaction solution obtained by the reaction in step 2, stir to obtain 4.99kg ammonium chloroplati...

Embodiment 3

[0036] A platinum refining process, comprising the steps of:

[0037] Step 1. Slurry 8kg of crude ammonium chloroplatinate with 80L deionized water to form a slurry, heat the slurry to 95°C, then add 1.6kg of analytically pure sodium metabisulfite under stirring conditions, keep the temperature and continue to stir the reaction Until the yellow ammonium chloroplatinate is completely dissolved;

[0038] Step 2. Cool the first reaction solution obtained from the reaction in step 1 to room temperature and then filter, heat the filtrate obtained by filtration to 95° C., and then add 7.98 L of analytically pure hydrochloric acid and 1.6 kg of analytically pure sodium chlorate under stirring conditions , continue to stir and keep warm for 45 minutes until no yellow ammonium chloroplatinate is precipitated;

[0039] Step 3, add 1.6kg of analytically pure ammonium chloride to it after cooling the second reaction solution obtained by the reaction in step 2, stir to obtain 39.95kg ammo...

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PUM

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Abstract

The invention relates to a platinum refining process, which comprises the following steps that deionized water is added into crude ammonium chloroplatinate; pulpifying is performed to obtain pulpifiedliquid; after the pulpified liquid is heated, sodium metabisulfite is added into the pulpified liquid in a stirring state; continuous stirring is performed; heat insulation reaction is performed until the ammonium chloroplatinate is completely dissolved; first reaction liquid obtained through reaction is cooled and filtered; filtering liquid obtained through filtering is heated; then, hydrochloric acid and sodium chlorate are sequentially added under the stirring state; continuous stirring is performed; heat insulation reaction is performed until the ammonium chloroplatinate is completely separated out; second reaction liquid obtained through reaction is cooled; ammonium chloride is added; stirring is performed until the ammonium chloride is dissolved; then, filtering is performed; filterslag obtained through filtering is washed by a hydrochloric acid-ammonium chloride solution; then, the first to third steps are repeated for 2 to 3 times; pure ammonium chloroplatinate is obtained; calcination is performed; spongy platinum can be obtained. The sodium pyrosulfite is used for reduction; the ammonium chloroplatinate is dissolved; a series of problems of ammonium chloroplatinate calcination, royal water dissolution and denitration processes in the prior art can be solved.

Description

technical field [0001] The invention relates to the technical field of refining, in particular to a platinum refining process. Background technique [0002] The main methods of platinum refining are aqua regia dissolution-ammonium chloride repeated precipitation method, oxidation hydrolysis method, carrier hydrolysis method, molten salt electrolysis method and zone smelting method, among which aqua regia dissolution-ammonium chloride repeated precipitation method is widely used in industrial production. However, this process has the problems of long process flow, time-consuming operation and high labor intensity, and a large amount of corrosive gas is generated during the calcination of ammonium chloroplatinate, and harmful nitrogen oxide gas is easily generated during the dissolution process of aqua regia, and the removal of nitrate is not complete. It will cause a series of shortcomings such as palladium exceeding the standard in platinum sponge products. [0003] Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/22C22B3/44C22B11/00
CPCC22B3/22C22B3/44C22B11/04Y02P10/20
Inventor 易庆平余顺文苏陶贵陈勇王劲松李居宁
Owner JINGCHU UNIV OF TECH
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