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Method for separating and extracting platinum group metals

A platinum group metal, ammonium chloroplatinate technology, applied in the field of separation and extraction of platinum, can solve the problems of entrained organic phase, reduced extraction efficiency, pipeline blockage, etc., and achieves the effects of low cost, high direct yield and large production capacity

Active Publication Date: 2016-03-30
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the presence of base metals and other impurities, continuous extraction operations often result in pipeline blockage, the appearance of a third phase of turbid flocs, and the entrainment of organic phases in the water phase, resulting in reduced extraction efficiency.

Method used

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  • Method for separating and extracting platinum group metals

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Experimental program
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Effect test

Embodiment 1

[0019] It is 1.5g / L to control the palladium concentration in the platinum-group metal feed liquid, the platinum concentration is 10g / L, the volume is 1L, the potential is 850mv, and the acidity is 1mol / L. 201 Extraction and separation of palladium, palladium is extracted after organic reverse extraction of palladium; the concentration of platinum in the palladium residual solution is 9.4g / L, the concentration of palladium is 0.092g / L, and the volume is 1L, and the organic phase of palladium is extracted after back extraction; palladium is extracted After the remaining liquid is filtered, it is heated to boiling, and 25 g of ammonium chloride solids are added until no obvious precipitation is detected with a saturated ammonium chloride solution. After filtering, the obtained ammonium chloroplatinate is washed with ammonium chloride solution until the washing liquid is neutral, and the filtrate and Platinum was recovered from the lotion; 30 g of ammonium chloroplatinate obtained...

Embodiment 2

[0021] It is 5.5g / L to control the palladium concentration in the platinum group metal feed liquid, the platinum concentration is 20g / L, the volume is 1L, the potential is 950mv, and the acidity is 1.2mol / L. 201 Extraction and separation of palladium, palladium is extracted after organic reverse extraction of palladium; the concentration of platinum in the palladium residual solution is 19.8g / L, the concentration of palladium is 0.041g / L, and the volume is 1L, and the organic phase of palladium is extracted after back extraction; palladium is extracted After the remaining liquid is filtered, it is heated to boiling, and 40 g of ammonium chloride solid is added until no obvious precipitation is detected with a saturated ammonium chloride solution. After filtering, the obtained ammonium chloroplatinate is washed with ammonium chloride solution until the washing liquid is neutral, and the filtrate and Platinum was recovered from the lotion; 35g of ammonium chloroplatinate obtained...

Embodiment 3

[0023] It is 2.5g / L to control the palladium concentration in the platinum-group metal feed liquid, the platinum concentration is 15g / L, the volume is 1L, the potential is 900mv, and the acidity is 1.5mol / L. 201 Extraction and separation of palladium, palladium is extracted after organic reverse extraction of palladium; the concentration of platinum in the palladium residual solution is 14.1g / L, the concentration of palladium is 0.012g / L, and the volume is 1L, and the organic phase of palladium is extracted after back extraction; After the remaining liquid is filtered, it is warmed up to boiling, and 30 g of ammonium chloride solid is added until no obvious precipitation is detected with a saturated ammonium chloride solution. After filtering, the obtained ammonium chloroplatinate is washed with ammonium chloride solution until the washing liquid is neutral, and the filtrate and Platinum was recovered from the lotion; 30 g of ammonium chloroplatinate obtained by filtration was ...

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Abstract

The invention provides a method for separating and extracting platinum group metals. The method comprises the steps that the palladium concentration of feed liquid containing the platinum group metals is controlled to be 1.5-5.5g / L, the electric potential of the feed liquid is controlled to be 850-950mv, palladium is extracted by means of S201 organic phases, and palladium is extracted from the palladium-loaded organic phases through the following process. Ammonium chloride is added into palladium extraction raffinate to deposit platinum, obtained ammonium chloroplatinate is subjected to reduction and dissolution by being added with hydrazine dihydrochloride solution and is heated to 90-95 DEG C, and chlorine gas is introduced; after the obtained ammonium chloroplatinate is repeatedly subjected to the hydrazine dihydrochloride reduction process for 2-3 times, and high-purity platinum black can be obtained by reducing the ammonium chloroplatinate through the hydrazine dihydrochloride according to the mass ratio of 1:1. Compared with the prior art, the method has the advantages that the process is simple, the precious metal separation efficiency is high, generation of a larger amount of ammonia-contained waste gas is avoided in the process of reducing ammonium chloroplatinate through hydrazine hydrate, and no nitrogen oxide pollution is produced.

Description

technical field [0001] The invention belongs to the technical field of metal separation, and in particular relates to a method for separating and extracting platinum from palladium-extracted raffinate containing platinum group metal solution, slag or secondary resources. Background technique [0002] At present, in the platinum refining process, the refining process of dissolving in aqua regia and repeatedly precipitating ammonium chloride is mostly adopted. This method is the oldest and classic refining process. During the process of removing nitrate and acid, part of the platinum will be dispersed into the flue gas along with the flue gas ; And 1% hydrochloric acid dissolved insoluble slag with higher platinum content, resulting in the dispersion of platinum. The process of catching acid and nitrate is cumbersome to operate, the production cycle is long, and the cost is high. The nitrogen oxides produced during the dissolution of aqua regia and the removal of nitric acid ...

Claims

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Application Information

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IPC IPC(8): C22B11/06
CPCC22B11/06
Inventor 张发志潘从明谢振山杨丽虹郭晓辉王立
Owner JINCHUAN GROUP LIMITED
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