A platinum refining process

A technology of process and process steps, applied in the field of platinum refining process, to achieve the effects of reducing negative impact, improving direct yield and shortening production cycle

Active Publication Date: 2018-04-10
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 reduce the adverse effects brought by the above technologies as much as possible. By studying the process parameters and characteristics of each link of aqua regia dissolution, a method can be provided on the basis of the existing technology that can greatly reduce the existing process. The negative impact of the platinum refining process has greatly increased the existing production capacity

Method used

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  • A platinum refining process

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Embodiment 1

[0018] For platinum-containing concentrates with a grade greater than 80%, the primary solution of aqua regia is filtered with a hydrochloric acid solution with a mass fraction of 1% after acid removal and nitration; The filtrate control chlorine flow of volume 900L is 20L / min. Control the temperature at 85°C, measure the potential at 1050mV, the color of the feed liquid becomes darker, stop the chlorine gas flow; adjust the pH value of the feed liquid to 8 with liquid caustic soda, control the temperature during the entire hydrolysis process at 85°C, and the stirring intensity during the addition of alkali is 80r / min , after the pH = 8 is stable for 5 minutes, cool and filter directly, the filtrate is orange red; back to acid to pH = 1, repeat the above steps 2 and 3 three times. Return the obtained liquid after three times of hydrolysis to acid, control the acidity pH=1, add saturated ammonium chloride solution with a volume ratio of 1:1 to precipitate platinum after boiling...

Embodiment 2

[0020] For platinum-containing concentrates with a grade greater than 80%, the primary solution of aqua regia is filtered with a hydrochloric acid solution with a mass fraction of 1% after acid removal and nitration; The filtrate control chlorine flow of volume 800L is 10L / min. Control the temperature at 75°C, measure the potential at 1000mV, the color of the feed liquid becomes darker, stop the chlorine gas flow; adjust the pH value of the feed liquid to 9 with liquid caustic soda, control the temperature of the entire hydrolysis process at 75°C, stir during the addition of alkali, and the stirring rate is 120r / min, after the pH = 9 is stable for 7 minutes, quickly cool and filter, the filtrate is orange red; back to acid to pH = 1.5, repeat the above steps 2 and 3 three times. Return the obtained three-time hydrolyzed solution to acid, control the acidity pH=0.5, add saturated ammonium chloride solution with a volume ratio of 1:1 to precipitate platinum after boiling, cool a...

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Abstract

The invention relates to a platinum refining process. The platinum refining process comprises the following steps: (1) dissolving various platinum containing feed liquids and a coarse platinum ammonium salt, and performing filtration after brushing away acids and denitrating; (2) throwing the filtrate into a reaction kettle, introducing chlorine for hydrolyzing while raising the temperature, and stopping introducing chlorine when the potential is increased to over 1000mV; (3) adding a caustic soda liquid while stirring to adjust the pH value, and directly cooling and filtering the mixture when the pH=8-9 is stabilized for more than 5min, wherein the filtrate is orange; (4) returning acid from the filtrate, repeating the steps 2 and 3 three times, finally returning acid from post-hydrolyzed liquids obtained in three times to control the acidity of the feed liquids, adding a saturated ammonium chloride solution after boiling to precipitate platinum, and then cooling and filtering the mixture after boiling; and (5) calcining ammonium chloroplatinate obtained at 680 DEG C to obtain sponge platinum. The platinum refining process provided by the invention has the beneficial effects that 1, the production period is shortened by more than 40%; 2, denitrating is reduced by at least one time, so that the capacity is favorably enhanced and the environment is favorably improved; and 3, the direct yield of platinum is improved by 1.94%.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a platinum refining process, which can be used for various platinum-containing feed liquids and crude platinum ammonium salts. Background technique [0002] There are many platinum refining processes, and the main methods currently used in production are: aqua regia dissolution-ammonium chloride repeated precipitation method, oxidation hydrolysis method, carrier hydrolysis method, carrier hydrolysis-ion exchange method, alkali dissolution-reduction method, reduction- Dissolution method, reduction dissolution-ammonium chloride repeated precipitation method and extraction and refining method, etc. Based on the aqua regia dissolution-ammonium chloride repeated precipitation method has a strong adaptability to complex materials, so this method is currently the most widely used in industry, but this method has the following shortcomings in long-term indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00
CPCC22B11/04
Inventor 谢振山王立郭晓辉杨丽虹刘世和
Owner JINCHUAN GROUP LIMITED
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