Purification method for crude ammonium chloroplatinate

A technology of crude ammonium chloroplatinate and ammonium chloroplatinate is applied in directions such as process efficiency improvement, can solve the problems of removing unfavorable impurity elements, increasing the burden of platinum refining process, etc., and achieves the effect of simple and easy process

Inactive Publication Date: 2020-04-07
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the crude ammonium chloroplatinate directly enters the platinum refining process, it will not be conducive to the removal of impurity elements and will also increase the burden on the platinum refining process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 of the present invention provides a kind of purification method of crude ammonium chloroplatinate, specifically implements according to the following steps:

[0024] Slurry 1kg of crude ammonium chloroplatinate with 10L of water, raise the temperature to 85°C, add 1.2L of industrial hydrochloric acid and 70g of sodium chlorate, keep the temperature and stir for 1 hour, boil the solution for 2 hours to catch chlorine, add 800g of ammonium chloride to the solution, After the solution is cooled, it is filtered to obtain high-purity ammonium chloroplatinate, and enters the platinum refining process. The filtrate is added with caustic soda to adjust the pH value to 8, and after the temperature is raised to 80°C, an appropriate amount of hydrazine hydrate is added until the solution is clear and there is no slag in the small test, and the gold is recovered. , palladium and tellurium.

Embodiment 2

[0026] Embodiment 2 of the present invention provides a kind of purification method of crude ammonium chloroplatinate, specifically implements according to the following steps:

[0027] Add 8 L of water to 1 kg of crude ammonium chloroplatinate to make slurry, raise the temperature to 88 °C, add 1.5 L of industrial hydrochloric acid and 60 g of sodium chlorate, and keep stirring for 1.5 h at the temperature. The solution was boiled for 3h to catch chlorine. Add 900g of ammonium chloride to the solution, and filter to obtain high-purity ammonium chloroplatinate after the solution is cooled, and enter the platinum refining process. Add caustic soda to the filtrate to adjust the pH value to 8, add appropriate amount of hydrazine hydrate after raising the temperature to 70°C, until the solution is clear and there is no slag in the small test, and recover gold, palladium and tellurium.

Embodiment 3

[0029] Embodiment 3 of the present invention provides a kind of purification method of crude ammonium chloroplatinate, specifically implements according to the following steps:

[0030] Slurry 1kg of crude ammonium chloroplatinate with 7L of water, raise the temperature to 82°C, add 1.8L of industrial hydrochloric acid and 80g of sodium chlorate, keep stirring for 2 hours at the temperature, and boil the solution for 4 hours for chlorine removal. Add 1000g of ammonium chloride to the solution, after the solution is cooled, filter to obtain high-purity ammonium chloroplatinate, enter the platinum refining process, add caustic soda to the filtrate to adjust the pH value to 8, and add appropriate amount of hydrazine hydrate after heating up to 65°C until the solution is clear , until there is no slag in the small test, gold, palladium and tellurium are recovered.

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PUM

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Abstract

The invention discloses a purification method for crude ammonium chloroplatinate. The purification method comprises the specific steps of S1, pulpifying crude ammonium chloroplatinate, heating the crude ammonium chloroplatinate, adding hydrochloric acid and sodium chlorate, and stirring the mixture to obtain a mixed solution; S2, boiling the mixed solution and keeping the temperature for a fixed time, adding ammonium chloride, and filtering the solution after the mixed solution is cooled to obtain high purity ammonium chloroplatinate and a filtrate; and S3, adjusting the pH value of the filtrate to 8-9 and heating the filtrate, and adding hydrazine hydrate to reduce the filtrate to recover gold, palladium and tellurium. Impurity elements such as gold, palladium and tellurium in the crude ammonium chloroplatinate are removed by adopting a water solution chlorination process, and the process is simple and feasible.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a method for purifying crude ammonium chloroplatinate. Background technique [0002] The mixture of ammonium chloroplatinate and ammonium chloropalladate is dissolved in sodium sulfite to separate palladium to obtain crude ammonium chloroplatinate, which also contains impurity elements such as gold, palladium and tellurium. If the crude ammonium chloroplatinate directly enters the platinum refining process, it will not be conducive to the removal of impurity elements, and will also increase the burden on the platinum refining process. Therefore, it is necessary to adopt a new process to remove impurity elements in crude ammonium chloroplatinate. Contents of the invention [0003] The purpose of the present invention is to provide a kind of purification method of crude ammonium chloroplatinate, can reduce dissolving time, reduce energy consumption....

Claims

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Application Information

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IPC IPC(8): C22B3/44C22B3/22C22B11/00
CPCC22B3/22C22B3/44C22B11/04Y02P10/20
Inventor 许开华余顺文苏陶贵郑宏伟张云河易庆平
Owner JINGMEN GEM NEW MATERIAL
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