Method for preparing high-purity platinum on basis of microbial adsorption

A microbial adsorption and microbial technology, applied in the direction of improving process efficiency, etc., can solve the problem of no relevant reports on high-purity platinum, and achieve the effects of easy implementation, low cost, and mild preparation conditions

Inactive Publication Date: 2020-06-23
SINO PLATINUM METALS CO LTD
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Problems solved by technology

At present, there are many studies on the recovery of precious metals by microbial...

Method used

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Embodiment

[0029] 1) Adjust the pH value of 1L chloroplatinic acid solution (platinum 30g / L) to 1, add solid 350g modified Escherichia coli to it, stir at room temperature for 4 hours, and vacuum filter with polytetrafluoroethylene acid-resistant microporous microfiltration membrane , washed with deionized water to obtain platinum-loaded microorganisms;

[0030] 2) Desorb the platinum-loaded microorganisms with 2 mol / L hydrochloric acid for 2 hours, and vacuum-filter and separate them with a polytetrafluoroethylene acid-resistant microporous microfiltration membrane to obtain a platinum solution;

[0031] 3) Pass the platinum solution through a three-stage 001×7 ion exchange resin column to remove impurity ions and obtain a pure platinum solution;

[0032] 4) Add excess solid ammonium chloride to the platinum solution until the ammonium chloroplatinate precipitate is completely generated, filter, and wash with 15% ammonium chloride solution;

[0033] 5) Precipitating ammonium chloroplat...

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Abstract

The invention discloses a method for preparing high-purity platinum on basis of microbial adsorption, and belongs to the technical field of preparation of high-purity precious metals. According to themethod, the high-purity platinum is prepared with the technology combining impurity removal methods of microbial selective adsorption, hydrochloric acid desorption, ion exchange, ammonium chloroplatinate precipitation and the like with calcined hydrogen reduction. The method includes the following steps of (1) microbial selective adsorption, (2) desorption separation of platinum, (3) ammonium chloride precipitation of the platinum, (4) calcination and (5) acid cooking for removal of impurities. According to the method, the preparation technological process is simple, the method is easy to implement, a microbial adsorption agent can be recycled, the preparation process is clean, environment-friendly and pollution-free, preparation conditions are mild, the cost is low, and the obtained high-purity platinum has the purity being 99.999% or above, has the impurity content lower than 10 ppm and is applicable in the fields of electronic industries, high-purity precious metal materials and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of high-purity precious metals, in particular to a method for preparing high-purity platinum based on microbial adsorption. Background technique [0002] High-purity platinum has good chemical stability, high electrical conductivity and thermal conductivity, unique electrical, magnetic, optical and other properties, and is widely used in national defense, military industry, satellite, electronics and other industries. 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. [0003] At present, the preparation method of high-purity platinum in China is mainly based on repeated precipitation of ammonium chloroplatinate. The purity of platinum prepared by this method is low, which cannot meet the requi...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B3/18C22B3/24C22B3/44
CPCC22B3/18C22B3/24C22B3/44C22B11/04Y02P10/20
Inventor 董海刚赵家春崔浩吴跃东童伟锋戴华王亚雄吴晓峰
Owner SINO PLATINUM METALS CO LTD
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