Preparation method of high-purity platinum powder

A platinum powder and high-purity technology is applied in the field of preparation of high-purity platinum powder, and achieves the effects of simple preparation method, low energy consumption and good removal effect

Active Publication Date: 2018-03-27
SINO PLATINUM METALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the invention is to propose a method for preparing high-purity platinum powder for the existing problems in the preparation of high-purity platinum powder

Method used

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  • Preparation method of high-purity platinum powder
  • Preparation method of high-purity platinum powder

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Effect test

Embodiment 1

[0015] Embodiment 1, see attached figure 1 , Ammonium chloride is added to the chloroplatinic acid solution to generate ammonium chloroplatinate precipitate, which is filtered and washed; the generated ammonium chloroplatinate precipitate is made into a suspension with deionized water, and then sulfurous acid is slowly added, wherein sulfurous acid and chlorine The molar ratio of ammonium platinate is 1.2, and the solution potential is controlled at 0.68±0.2V throughout the process, so that the ammonium chloroplatinate is reduced to soluble ammonium chloroplatinite, and the insoluble matter is filtered out, and the ammonium chloroplatinate solution is passed through a three-stage 001×7 ion exchange resin column to remove impurity ions; to obtain pure chloroplatinous acid solution, add superior grade pure hydrazine hydrate to this solution, wherein the molar ratio of hydrazine hydrate to chloroplatinous acid is 3, fully reduce, Platinum powder is obtained, and the platinum powd...

Embodiment 2

[0016] Embodiment 2, see attached figure 1 , Ammonium chloride is added to the chloroplatinic acid solution to generate ammonium chloroplatinate precipitate, which is filtered and washed; the ammonium chloroplatinate precipitate is made into a suspension with deionized water, and then sulfurous acid is slowly added, wherein sulfurous acid and chloroplatinic acid The molar ratio of ammonium is 1.2, and the solution potential is controlled at 0.65±0.2V throughout the process to reduce ammonium chloroplatinate to soluble ammonium chloroplatinite, filter out insoluble matter, and pass the ammonium chloroplatinite solution through a three-stage 001×7 ion Exchange resin column to remove impurity ions; obtain pure chloroplatinous acid solution, add superior grade pure hydrazine hydrate to this solution, wherein the mol ratio of hydrazine hydrate to chloroplatinous acid is 4, fully reduce, and obtain platinum powder, The platinum powder was boiled and washed with a mixed dilute soluti...

Embodiment 3

[0017] Embodiment 3, see attached figure 1 , ammonium chloride is added to the chloroplatinic acid solution to generate ammonium chloroplatinate precipitate, which is filtered and washed with saturated ammonium chloride solution; the ammonium chloroplatinate precipitate is made into a suspension with deionized water, and then slowly added oxalic acid, wherein The molar ratio of oxalic acid to ammonium chloroplatinate is 1.2, and the potential of the solution is controlled at 0.70±0.2V throughout the process to reduce the ammonium chloroplatinate to soluble ammonium chloroplatinate, filter out the insoluble matter, and pass the ammonium chloroplatinate solution through three Grade 001×7 ion exchange resin column to remove impurity ions; to obtain pure chloroplatinous acid solution, add superior grade pure hydrazine hydrate to this solution, wherein the molar ratio of hydrazine hydrate to chloroplatinous acid is 5, fully reduce , to obtain platinum powder, the platinum powder wa...

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Abstract

The invention discloses a preparation method of ultra-pure platinum powder. The preparation method comprises the steps of (1) precipitating platinum with ammonium chloride; (2) controlling potential for reduction: precipitating ammonium chloroplatinate with deionized water to prepare suspension liquid, adding reductant, and controlling the potential of a solution for reduction, so that an ammoniumchloroplatinite solution is obtained; (3) performing ion exchange to remove impurities: putting the ammonium chloroplatinite solution to a cation exchange column, and removing cation impurities, so that a pure chloroplatinous acid solution is obtained; (4) deeply reducing chloroplatinous acid: adding hydrazine hydrate to the chloroplatinous acid solution for deep reduction, so that platinum is reduced to powder; and (5) boiling with acid to remove impurities: boiling and washing the obtained platinum powder with a nitric acid and hydrofluoric acid mixed solution, fully washing with deionizedwater, and drying, so that high-purity platinum powder is obtained. The preparation method has the advantages of low energy consumption, low cost, simple process and the like, a conventional hydrometallurgical technique is adopted in the whole process, a high-temperature calcining process is not involved, and the purity is greater than 99.999%.

Description

technical field [0001] The invention relates to a preparation method of high-purity precious metals, in particular to a preparation method of high-purity platinum powder. Background technique [0002] High-purity platinum has good chemical stability, high electrical conductivity and thermal conductivity, and unique electrical, magnetic, optical and other properties. It is widely used in national defense, military industry, satellite, electronics and other industries. High-purity platinum powder has become a guarantee for the performance of semiconductor devices. It is an indispensable and irreplaceable material for the development of semiconductor technology. With the development of semiconductor technology and radio precision technology, the purity requirements of platinum metal are getting higher and higher. Because the properties of the metal tend to be masked by impurities when the metal fails to reach a certain purity, the presence of trace impurities or even ultra-tra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24
CPCB22F9/24
Inventor 董海刚赵家春杨海琼崔浩恭恬洁童伟锋吴跃东保思敏王亚雄吴晓峰
Owner SINO PLATINUM METALS CO LTD
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