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Refined platinum producing process

A technology, platinum black technology, applied in the field of improvement of the purification process, can solve the problems of long dissolution process, large amount of reagents, poor working conditions, etc., and achieve the effect of short process cycle, good operating conditions and reduced production costs

Inactive Publication Date: 2002-09-25
JINCHUAN GROUP LIMITED
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AI Technical Summary

Problems solved by technology

[0007] Due to the traditional platinum refining process, aqua regia is used as the solvent, which makes the dissolution process take a long time. It takes at least 72 hours from crude platinum ammonium chloride to high-purity platinum, and each process must be heated, which leads to high energy consumption, large amount of reagents, and labor conditions. Difference

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0029] The composition of the platinum solution of crude ammonium chloroplatinate treated by processes a, b, and c is: Pd 0.179g / l, Au<0.005g / l, Rh 0.625g / l, Ir 0.220g / l, Pt 146g / l, according to 20% of the theoretical amount is added to ammonium chloride for precipitation, the precipitation rate of platinum is 18%, the product quality purity obtained is 99.99%, and the product purity obtained by two-step complete precipitation is 99.9%. Example two

example 2

[0030] The composition of the platinum solution obtained after crude ammonium chloroplatinate is processed by processes a, b, and c is: Pd 0.0028g / l, Au99.9%. Example three

example 3

[0031] The platinum solution composition that thick ammonium chloroplatinate obtains after process a, b, c process is the same as example one, but add pure water before adding ammonium chloride precipitation, make its volume double, promptly control platinum concentration to be 73g / l, In the first step of precipitation, ammonium chloride is added according to 60% of the theoretical amount, the precipitation rate is 57%, and the product purity obtained is 99.99%, and the product purity obtained in the second step of complete precipitation is >99.9%. Example four

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Abstract

The present invention relates to wet noble metal smelting process. The process includes dissolution of coarse ammonium chloroplatinate with sodium hydroxide solution, reduction by adding hydrazine hydrate and filtering to obtain platinum black, hydrogen peroxide and hydrochloric acid dissolution to obtain platinum black, adidng ammonium chloride for fractional deposition of platinum in the form of ammonium chloroplainate, and conventional calcinatino to obtain spongy platinum. The present invention has short technological process, low productino cost, low power consumption, and good operationcondition, and it is possible to produce various products in different grade.

Description

(1) Technical field [0001] A process for the production of refined platinum, involving the improvement of a precious metal hydrometallurgical process, more specifically the purification of ammonium chloroplatinate in platinum production. (2) Background technology [0002] Traditional platinum refining process, usually with one volume of nitric acid HNO 3 A solvent (commonly known as aqua regia) prepared with three parts of hydrochloric acid HCl, under the condition of heating and boiling, the impure crude ammonium chloroplatinate [(NH 4 ) 2 PtCl 6 ] is dissolved, and the following reaction occurs: [0003] <chemistry num="001"> <chem file="01136099_cml001.xml" / > < / chemistry> [0004] 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, and the entire dissolution time must be at least 6 hours. In order to remove the nitrate NO...

Claims

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Application Information

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IPC IPC(8): C22B11/00
Inventor 何焕华
Owner JINCHUAN GROUP LIMITED
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