Method for recovering and refining platinum from crude ammonium chloroplatinate

A technology for crude ammonium chloroplatinate and ammonium chloroplatinate is applied in the field of recycling and refining platinum, and can solve the problems of large amount of reagents, high energy consumption, long dissolution process time, etc., and achieve the effect of short process cycle

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

[0004] Due to the traditional platinum refining process, aqua regia is used as the solvent, which makes the dissolution process take a long time, and each process must be heated, resulting in high energy consumption and a large amount of reagents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1 of the present invention provides a method for recovering refined platinum from crude ammonium chloroplatinate, specifically implemented according to the following steps:

[0037] 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, filter to obtain high-purity ammonium chloroplatinate, add high-purity ammonium chloroplatinate to 7L of water for slurry, add caustic soda to adjust the pH value to 8, and add appropriate amount of hydrazine hydrate after heating to 65°C to obtain platinum element;

[0038] Wash the platinum element with pure water, and filter out the platinum black, then add hydrochloric acid, then add hydrogen peroxide until the platinum black is completely dissolved, h...

Embodiment 2

[0040] Embodiment 2 of the present invention provides a method for recovering refined platinum from crude ammonium chloroplatinate, specifically implemented according to the following steps:

[0041] 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, filter the solution after cooling to obtain high-purity ammonium chloroplatinate, add 8L of water to the high-purity ammonium chloroplatinate for slurry, add caustic soda to adjust the pH value to 8, heat up to 70°C and add Appropriate amount of hydrazine hydrate to obtain platinum element;

[0042] Wash the platinum element with pure water, and filter out the platinum black, then add hydrochloric acid, then add hydrogen peroxide until the platinum black is compl...

Embodiment 3

[0044] Embodiment 3 of the present invention provides a method for recovering refined platinum from crude ammonium chloroplatinate, specifically implemented according to the following steps:

[0045] 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, filter the solution after cooling to obtain high-purity ammonium chloroplatinate, add 8L of water to the high-purity ammonium chloroplatinate for slurry, add caustic soda to adjust the pH value to 8, heat up to 75°C and add Appropriate amount of hydrazine hydrate to obtain platinum element;

[0046] Wash the platinum element with pure water, and filter out the platinum black, then add hydrochloric acid, then add hydrogen peroxide until the platinum black is completely dissolv...

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PUM

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Abstract

The invention discloses a method for recovering and refining platinum from crude ammonium chloroplatinate. The crude ammonium chloroplatinate is slurried, hydrochloric acid and sodium chlorate are added, and a mixed solution is obtained; the mixed solution is boiled and kept for a fixed time, ammonium chloride is added, the mixed solution is cooled and filtered, and high-purity ammonium chloroplatinate is obtained; the high-purity ammonium chloroplatinate is slurried, the pH value is adjusted to 8-9 and heating is carried out, hydrazine hydrate is added for reduction, and a platinum element isobtained; the platinum element is dissolved with hydrochloric acid and hydrogen peroxide to obtain a dissolving solution; the dissolving solution is precipitated by adopting an ammonium chloride fractional precipitation method to obtain ammonium chloroplatinate, and the ammonium chloroplatinate obtained in the first step is calcined to obtain sponge platinum; and the sponge platinum is subjectedto deoxygenation treatment, washing and drying to obtain a sponge platinum product. According to the method, impurity elements in the crude ammonium chloroplatinate are removed by adopting an aqueoussolution chlorination method, the ammonium chloroplatinate is refined by reduction of hydrazine hydrate, dissolution of hydrogen peroxide and hydrogen peroxide and fractional precipitation of ammoniumchloride to obtain sponge platinum, and the whole process period is short.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a method for recovering and refining platinum from crude ammonium chloroplatinate. Background technique [0002] The traditional platinum refining process usually uses a solvent (commonly known as aqua regia) prepared by one volume of nitric acid and three volumes of hydrochloric acid to dissolve impure crude ammonium chloroplatinate under heating and boiling conditions. [0003] In order to realize the complete dissolution of ammonium chloroplatinate, it is necessary to add aqua regia more than 5-6 times, and the aqua regia must be prepared on the spot. The nitrate in the solution must be evaporated completely until it is nearly dry, and then add dilute hydrochloric acid for more than three times as thick as syrup. Finally, add dilute hydrochloric acid to the solution without nitrate and heat to boil to obtain a platinum solution. After cooling , a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00C22B3/44
CPCC22B11/04Y02P10/20
Inventor 许开华余顺文苏陶贵郑宏伟张云河王飞
Owner JINGMEN GEM NEW MATERIAL
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