Platinum refining process

A technology of process and process steps, applied in the field of platinum refining process, to achieve the effect of reducing negative impact, being beneficial to production capacity, and improving direct yield

Active Publication Date: 2016-11-23
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 reg

Method used

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  • Platinum refining process

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Effect test

Embodiment 1

[0019] The platinum-containing concentrate with a grade of more than 80% is filtered with a hydrochloric acid solution with a mass fraction of 1% after the primary dissolving liquid of aqua regia is driven by acid and nitrate; The filtrate of volume 900L controls the flow rate of chlorine gas to be 20L / min. The control temperature was 85℃, after measuring the potential of 1050mV, the color of the feed liquid became darker, and the chlorine gas was stopped; the pH value of the feed liquid was adjusted to 8 with liquid alkali, the temperature of the whole hydrolysis process was controlled at 85℃, and the stirring intensity during the alkali addition process was 80r / min , after the pH=8 was stabilized for 5 minutes, the filtrate was directly cooled and filtered, and the filtrate was orange-red; acidified to pH=1, and the above steps 2 and 3 were repeated three times. Return the obtained liquid after three hydrolysis to acid, control the acidity pH=1, add saturated ammonium chlori...

Embodiment 2

[0021] The platinum-containing concentrate with a grade of more than 80% is filtered with a hydrochloric acid solution with a mass fraction of 1% after the primary dissolving liquid of aqua regia is driven by acid and nitrate; The filtrate of volume 800L controls the flow rate of chlorine gas to be 10L / min. The control temperature is 75°C, after measuring the potential of 1000mV, the color of the feed liquid becomes darker, and the chlorine gas is stopped; the pH value of the feed liquid is adjusted to 9 with liquid caustic soda, the temperature of the whole hydrolysis process is controlled at 75°C, and the stirring rate is 120r / min, after pH=9 is stable for 7min, rapidly cool and filter, the filtrate is orange-red; return to acid to pH=1.5, repeat the above steps 2 and 3 three times. The obtained liquid after three hydrolysis is returned to acid, and the acidity is controlled between pH=0.5. After boiling, a saturated ammonium chloride solution with a volume ratio of 1:1 is 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 processes, in particular 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. The main methods currently used in production are: aqua regia dissolution-ammonium chloride repeated precipitation method, oxidative 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 refining method, etc. Based on aqua regia dissolution-ammonium chloride repeated precipitation method, it has strong adaptability to complex materials. Therefore, this method is currently the most widely used in industry, but this method has the following shortcomings in long-term industrial producti...

Claims

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Application Information

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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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