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Synthetic method for stannous chloride

A technology of stannous chloride and synthesis method, applied in the direction of electrolysis process, electrolysis components, etc., can solve the problems of large amount of sewage, waste of resources, difficult recovery of tin-containing slag, etc., and achieves the effect of reliable process and slow reaction.

Active Publication Date: 2016-08-17
云南锡业锡化工材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the waste of resources, high cost, large amount of sewage, difficult recovery of tin-containing slag, leakage of toxic and harmful gases such as chlorine gas in the existing stannous chloride synthesis method, and provide a method of electrolysis, concentration, purification, A new method for producing tin protochloride in processes such as crystallization, no harmful gases such as chlorine gas and hydrogen chloride are produced in the electrolysis process, and at the same time, a synthesis method of stannous chloride other than the concentrated hydrochloric acid method and the chlorine gas method is provided, which is operable Strong, low cost, environmentally friendly, high security and other advantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Using 400 g to cast into two pieces with an effective area of ​​4dm 2 The polar plates are placed in the cathode and anode electrolytic cells separated by anion exchange membrane respectively. A 5%wt hydrochloric acid solution prepared with dilute hydrochloric acid is added to the anode tank, and 6%wt hydrochloric acid prepared with dilute hydrochloric acid is added to the cathode tank. solution. Input 1.9A / dm 2 direct current, electrolytic reaction at room temperature for 24h, to obtain tin containing 6.9%wt, hydrochloric acid is 1.8%wt stannous chloride electrolyte, the electrolyte is put into a reactor equipped with 10g tin flakes to concentrate, to obtain a specific gravity of 2.0g / cm 3 The concentrated solution, the concentrated solution is crystallized and dehydrated to obtain white crystals of stannous chloride with a main content of 99.2%, and other product indicators comply with HG / T 2526-2007.

Embodiment 2

[0016] 400 g metal tin is cast into two pieces with an effective area of ​​4dm 2 The polar plates are placed in the cathode and anode electrolytic cells separated by anion exchange membrane respectively, 6%wt hydrochloric acid solution prepared with dilute hydrochloric acid is added to the anode tank, and 7%wt hydrochloric acid prepared with dilute hydrochloric acid is added to the cathode tank solution. Pass through a direct current of 1.8A, and perform an electrolysis reaction at room temperature for 24 hours to obtain a stannous chloride electrolyte solution containing 6.6%wt of tin and 2.25%wt of hydrochloric acid, and the electrolyte is put into a reactor equipped with 10g of tin flakes for concentration , to obtain a specific gravity of 2.05g / cm 3 The concentrated solution, the concentrated solution is crystallized and dehydrated to obtain white crystals of stannous chloride with a main content of 99.15%, and other product indicators comply with HG / T 2526-2007.

Embodiment 3

[0018] 400 g metal tin is cast into two pieces with an effective area of ​​4dm 2 The polar plates are placed in the cathode and anode electrolytic cells separated by anion exchange membrane respectively, 9%wt hydrochloric acid solution prepared with dilute hydrochloric acid is added to the anode tank, and 10%wt hydrochloric acid prepared with dilute hydrochloric acid is added to the cathode tank solution. Input 1.9A / dm 2 direct current, electrolytic reaction at room temperature for 24h, to obtain the tin protochloride electrolyte solution containing 5.8%wt tin and 2.9%wt hydrochloric acid, the electrolytic solution is put into a reactor equipped with 10g tin flakes and concentrated to obtain a specific gravity of 2.1g / cm 3 The concentrated solution, the concentrated solution is crystallized and dehydrated to obtain white crystals of stannous chloride with a main content of 99.27%, and other product indicators comply with HG / T 2526-2007.

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Abstract

The invention relates to a method for synthesizing stannous chloride through a membrane electrolysis method and belongs to the technical field of inorganic chemical engineering. A catholyte and an anolyte of certain concentrations are prepared through diluted hydrochloric acid. A cathode plate and an anode plate which are made of refined tin are put into a cathode frame and an anode frame of an electrolytic cell correspondingly. Under the action of direct currents, anode tin loses electrons, stannous ions are formed and enter the anolyte to be combined with chlorine ions, and a stannous chloride electrolyte is formed. The stannous chloride electrolyte is put into a reactor containing a certain amount of tin for concentration. The stannous chloride is obtained after a concentrated solution is subjected to the purification, crystallization and solid-liquid separation processes. According to the novel method provided by the invention, the stannous chloride is generated through electrolysis, concentration, purification, crystallization and other processes, and chlorine gas, hydrogen chloride and other harmful gases are not generated in the electrolysis process. Meanwhile, the method for synthesizing the stannous chloride besides a concentrated hydrochloric acid method and a chlorine gas method is provided. The method for synthesizing the stannous chloride has the advantages of being high in operability, low in cost, environmentally friendly, high in safety and the like and can be used for industrialization popularization.

Description

technical field [0001] The invention relates to a method for synthesizing stannous chloride by dilute hydrochloric acid diaphragm electrolysis, which belongs to the technical field of inorganic chemical industry. Background technique [0002] Stannous chloride (SnCl 2 2H 2 O) is an important chemical raw material and chemical product, which is widely used in tin electroplating, dyes, spices, mirror making, ultra-high pressure lubricating oil, bleaching and other industries, and is used as reducing agent, mordant, decolorizing agent and analytical reagent. In the determination of silver, arsenic, molybdenum, mercury, etc. At present, the method of industrialized production of stannous chloride is mainly: the method of producing stannous chloride with concentrated hydrochloric acid: put the raw material tin into the reaction pot, slowly add industrial hydrochloric acid with a content greater than 31%wt, and react naturally for a certain period of time, then heat and concentr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/26
CPCC25B1/26
Inventor 李伟贾庆明胡洋唐黎魏兵郭应辉
Owner 云南锡业锡化工材料有限责任公司
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