Method for purifying platinum through reduction

A new method, the technology of ammonium chloroplatinate, is applied in the direction of improving process efficiency, which can solve the problems of long process flow, low platinum direct recovery rate, and heavy labor, and achieve simple operation, improved yield and quality, and easy operation. good elasticity

Active Publication Date: 2017-01-11
JINCHUAN GROUP LIMITED
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The technical problem solved by the present invention is to propose a method for reducing and purifying platinum to deal with the shortcomings such as low platinum direct recovery rate, large pollution, long process flow, and large labor load in the process of purifying platinum by traditional aqua regia dissolution process The method of crude ammonium chloroplatinate makes the purification of platinum have the advantages of high direct recovery rate, good cleaning, short process and stable product quality

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  • Method for purifying platinum through reduction
  • Method for purifying platinum through reduction
  • Method for purifying platinum through reduction

Examples

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Embodiment 1

[0023] A new method for reducing and purifying platinum. The process steps are: extract 1000g of crude platinum ammonium salt obtained by extracting mineral platinum group concentrate, add 8L of pure water at a solid-to-liquid ratio of 1:8 for slurrying, and heat up to 90°C. Add 1.5 L of sodium bisulfite solution with a mass fraction of 35% to the slurry at 90°C within 5 minutes at a rate of 30 L / h, and react at a constant temperature for 40 minutes. After the reaction was completed, the temperature was rapidly lowered and filtered, and the filter residue weighed 13.526g. The temperature of the filtrate was raised to 85° C., and chlorine gas was introduced into the filtrate until the filtrate continued to be fed with chlorine gas, and there was almost no precipitation. The mixture was heated and boiled for 30 minutes, and then rapidly cooled and filtered. The filter residue was washed with ammonium chloride water with a mass fraction of 17%, and the washing liquid was incorpor...

Embodiment 2

[0027] A new method for reducing and purifying platinum. The process steps are: add 1000g of crude platinum ammonium salt obtained by enrichment and preliminary extraction of exhausted petrochemical catalysts into 6L of pure water at a solid-to-liquid ratio of 1:6 for slurrying, and heat up to 85°C . Add 1.8 L of sodium bisulfite solution with a mass fraction of 30% to the slurry at 85°C within 5 minutes at a rate of 25 L / h, and react at a constant temperature for 30 minutes. After the reaction was completed, the temperature was rapidly lowered and filtered, and the filter residue weighed 14.673g. The temperature of the filtrate was raised to 80° C., and chlorine gas was passed therein until the filtrate continued to be fed with chlorine gas and almost no precipitation occurred, then the mixture was heated and boiled for 20 minutes, and then rapidly cooled and cooled to filter. The filter residue was washed with ammonium chloride water with a mass fraction of 17%, and the was...

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Abstract

A new method for purifying platinum through reduction relates to a process for purifying platinum from crude ammonium chloroplatinate through reduction. The method comprises the steps of: pulpifying the crude ammonium chloroplatinate and then heating, adding a saturated sodium hydrogen sulfite solution into the pulp under a thermal state to reduce and dissolve the crude ammonium chloroplatinate, and introducing chlorine after filtering to precipitate again. The purifying effect is achieved through repeated operation and spongy platinum which accords with the natural first-class standard is produced. The method provided by the invention has the advantages that the process is simple in flow and cost is low; less waste gas is discharged and is easy to treat; and waste liquid is low in acidity and is easy to recycle. By adoption of the process provided by the invention, the direct recovery rate of the platinum is 93% to 97%. By the method, the problems that the platinum settling efficiency is low, the waste gas amount is large, waste water is difficult to treat, the reduction efficiency is low and the reduction process is difficult to control in the traditional process of purifying the platinum through reduction are avoided; and environmental friendliness, high efficiency, simplicity and convenience of the process of purifying the platinum through reduction are realized.

Description

technical field [0001] The invention belongs to the technical field of metal separation and purification, and specifically relates to a method for purifying platinum by a reduction transformation method using crude ammonium chloroplatinate initially extracted from various platinum-containing resources such as mineral resources and secondary resources as raw materials. Background technique [0002] Platinum is an important precious metal, which is widely used in petrochemical, electronics, optical fiber and other fields due to its unique physical and chemical properties. Platinum resources include mineral resources and secondary resources. Regardless of the resource, the crude ammonium chloroplatinate containing copper, nickel, palladium, rhodium and other impurities produced after preliminary enrichment and refining is the main raw material for the final purification of platinum. [0003] The traditional platinum purification process is the aqua regia dissolution method. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B11/00
CPCC22B11/04Y02P10/20
Inventor 潘从明谢振山陈治毓杨丽虹王立陈爱良
Owner JINCHUAN GROUP LIMITED
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