A kind of synthetic method of stannous chloride

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...