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Platinum refining technology

A new process, the technology of ammonium chloroplatinate, applied in the field of platinum refining, can solve the problems of complex process and low production efficiency, and achieve the effects of simple process flow, low cost and reasonable connection

Active Publication Date: 2014-01-01
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a new platinum refining process with simple process, short flow process, high yield and stable product quality in view of the shortcomings of traditional platinum refining process such as complex process and low production efficiency

Method used

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Embodiment 1

[0016] Add 800ml of deionized water and 100g of platinum-group metal-containing materials containing ammonium chloroplatinate into a 2L beaker to form a slurry, and add 150ml of 12mol / L analytically pure hydrochloric acid to the slurry under constant stirring to adjust the slurry The acidity is 1.8mol / L, and then heated on an electric heating plate. After the slurry is heated to a boiling state, 27g of reducing agent ammonium oxalate is added. After one hour of reaction, 5g is added, and then 4g is added every half hour, twice in total. , that is, add 40 g of reducing agent ammonium oxalate in 2 hours of reaction, and then react for half an hour to completely dissolve the ammonium chloroplatinate. Filter the dissolved solution, add 150g of ammonium chloride solid to the filtrate, stir and dissolve, and after heating up to 85°C, pass chlorine gas into the fume hood for 10 minutes. The flow rate of chlorine gas is 25L / h. Ammonium platinum is re-precipitated. After the chlorine ...

Embodiment 2

[0019] Add 1000ml of pure water and 100g of platinum-group metal-containing material containing ammonium chloroplatinate into a 2L beaker to form a slurry, and add 150ml of 12mol / L analytically pure hydrochloric acid under constant stirring to adjust the acidity of the slurry to 2.0mol / L L, then transferred to the reaction kettle, heated to boiling state, added 33g of reducing agent ammonium oxalate in the state of boiling, added 5g after one hour of reaction, and then added 4g every half hour, a total of 3 times, that is, in After 2 hours of reaction, 50 g of reducing agent ammonium oxalate was added, and the ammonium chloroplatinate was completely dissolved in the reaction for about half an hour. During the dissolution process, the ammonium chloroplatinate precipitate gradually disappeared and bubbles were released continuously and steadily, and the solution finally turned rose red. Filter the solution, put the filtered filtrate in a reaction kettle, then add 100g of amm...

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Abstract

A platinum refining technology comprises the steps of platinum family metal contained concentrate (slag, secondary resources and the like) chlorination dissolving, dissolved solution acidity adjustment, organic reducing agent ammonium oxalate precipitation, and precious metal filtering separation. The technology has the characteristics of wide material adaptability and simple operation, allows ammonium chloroplatinate of a platinum family metal contained material containing ammonium chloroplatinate to be efficiently and rapidly dissolved and precipitated, and allows the dissolving efficiency, the precipitation rate and the refining recovery efficiency to reach 95-99%, 99% and 90-95% respectively in the whole refining process; and compared with a traditional ammonium chloride repeated-precipitation method, the technology effectively solves a problem that nitrogen oxide cannot be discharged in a standard reaching mode, and eliminates the problems of large labor intensity of a aqua regia dissolved solution nitrate removing process and low production efficiency. The reducing agent ammonium oxalate is an organic reagent, and reacts to generate a pollution-free gas which can be directly discharged in the reaction process, so a solution system is not changed, thereby no influences on subsequent platinum precipitation by ammonium chloride are caused, and the yield and the quality of platinum family metal products are substantially improved.

Description

technical field [0001] The invention belongs to the technical field of platinum refining, in particular to a new process for extracting platinum from platinum-group metal-containing solution, slag or secondary resources. Background technique [0002] There are many refining methods for platinum, which can be summarized as carbonyl platinum chloride method, molten salt electrolysis method, zone smelting method, ammonium chloride repeated precipitation method, sodium bromate hydrolysis method, oxidation carrier hydrolysis method, etc. Among them, the carbonyl chloride method and the molten salt electrolysis method are complicated in process and cumbersome in operation, which limits their large-scale production and application. The zone smelting method is mainly used to produce ultra-high purity platinum, and it is rarely used in large-scale industrial production. The sodium bromate hydrolysis method and the oxidized carrier hydrolysis method have a large amount of solution to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
Inventor 马玉天黄国生陈大林李明黄虎军严汝龙张燕赵彦才潘从明李进武
Owner JINCHUAN GROUP LIMITED
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