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Method for separating and extracting platinum with purity of 99.95% from gold-palladium-platinum-containing alloy

An alloy, palladium-platinum technology, applied in the field of separating and purifying 99.95% platinum, can solve the problems of long refining cycle, cumbersome process, low direct yield, etc., and achieve the effect of short process, guaranteed impurity removal effect, and low time consumption

Inactive Publication Date: 2019-04-12
KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional separation and refining methods mostly use reduction dissolution-repeated precipitation method, oxidative hydrolysis method, etc., but because the physical and chemical properties of palladium and platinum metals are very similar, there will be cumbersome procedures, long refining cycle, low direct recovery rate, and waste water during the operation of traditional methods. Disadvantages such as large amount and high residual amount of platinum in wastewater

Method used

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  • Method for separating and extracting platinum with purity of 99.95% from gold-palladium-platinum-containing alloy

Examples

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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a method for separating and purifying 99.95% platinum from gold-containing palladium-platinum alloy comprises the following steps:

[0033] (1) Acid leaching and dissolving: soak the alloy containing gold, palladium and platinum in aqua regia at 95°C for 90 minutes, cool and filter. ;

[0034] (2) Concentrate and catch up with nitrate: heat and concentrate the filtrate of step (1) to 1 / 2 of the original volume in a reactor; within the temperature range of 100°C, add concentrated hydrochloric acid and heat until no reddish-brown gas is produced, stop heating, Cool to 20°C;

[0035] (3) Precipitating platinum: add the solution of step (2) into ammonium chloride in proportion to 6% of the solution mass to precipitate platinum, stir for 60min, keep the stirring speed at 2.0r / s, let stand and cool to 25°C, Filter the platinum yellow, and wash the platinum yellow with a 17% ammonium chloride solution at a temperature of 30°C until the filtrate is...

Embodiment 2

[0042] Such as figure 1 As shown, a method for separating and purifying 99.95% platinum from gold-containing palladium-platinum alloy comprises the following steps:

[0043] (1) Acid leaching and dissolving: Soak the alloy containing gold, palladium and platinum in aqua regia at 100°C for 60 minutes, cool and filter, and the ratio of gold, palladium and platinum alloy to aqua regia is 1:4~6 (g / mL) ;

[0044] (2) Concentrate and catch up with nitrate: heat and concentrate the filtrate of step (1) in a reactor to 1 / 2 of the original volume; within the temperature range of 95°C, add concentrated hydrochloric acid and heat until no reddish-brown gas is produced, stop heating, Cool to 30°C;

[0045] (3) Precipitate platinum: add ammonium chloride to the solution of step (2) according to the proportion of 8% of the solution mass to precipitate platinum, stir for 30min, keep the stirring speed at 2.0r / s, let stand and cool to 25°C, Filter the platinum yellow, wash the platinum yel...

Embodiment 3

[0052] Such as figure 1 As shown, a method for separating and purifying 99.95% platinum from gold-containing palladium-platinum alloy comprises the following steps:

[0053] (1) Acid leaching and dissolving: Soak the alloy containing gold, palladium and platinum in aqua regia at 70°C for 70 minutes, cool and filter, and the ratio of gold, palladium and platinum alloy to aqua regia is 1:4~6 (g / mL) ;

[0054] (2) Concentrate and catch up with nitrate: heat and concentrate the filtrate of step (1) to 1 / 2 of the original volume in a reactor; within the temperature range of 98°C, add concentrated hydrochloric acid and heat until no reddish-brown gas is produced, stop heating, Cool to 25°C;

[0055] (3) Precipitate platinum: add ammonium chloride to the solution of step (2) according to the proportion of 7% of the solution mass to precipitate platinum, stir for 45min, keep the stirring speed at 2.0r / s, let stand and cool to 25°C, Filter the platinum yellow, and wash the platinum ...

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Abstract

The invention discloses a method for separating and extracting platinum with purity of 99.95% from a gold-palladium-platinum-containing alloy. The method comprises the steps of acid leaching dissolution, concentration and denitrification, platinum precipitation, impurity removal, palladium removal, oxidation and platinum precipitation, reduction and the like. The method is simple, easy to operateand short in process, and the platinum with the relative purity of 99.95% or above can be obtained after impurity removal and purification are carried out twice; according to the method, the purification effect is good, and the direct yield of the platinum is high; and meanwhile, the method has the advantages of being simple and short in operation process, short in recovery period, low in residualquantity of gold, palladium and platinum in wastewater and the like.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for separating and purifying 99.95% platinum from a gold-containing palladium-platinum alloy. Background technique [0002] Gold-palladium-platinum alloy is an alloy enriched and fused with gold, palladium, platinum and other metals. Precious metals such as gold, palladium, and platinum are widely used in jewelry making and electronic materials. During its industrial production and use, precious metal-containing scrap and waste will be produced. After enrichment, the precious metal can be reused after separation and purification. [0003] Alloy materials containing gold, palladium and platinum are still in an imperfect stage in terms of separation and refining technology. Traditional separation and refining methods mostly use reduction dissolution-repeated precipitation method, oxidative hydrolysis method, etc., but because the physical and chemical properties of palladium an...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/007C22B11/042Y02P10/20
Inventor 孔维龙朱振华
Owner KANFORT JIANGMEN ENVIRONMENTAL TECH CO LTD
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