Method for producing sodium stannate by using tin and tin alloy

Abstract

The invention discloses a method for producing sodium stannate by using tin and tin alloy, which comprises the following steps: (1) the tin and the tin alloy have chemical reaction with sodium hydroxide and oxidizer at a temperature of between 300 and 550 DEG C to obtain granular coarse sodium stannate; the reaction course comprises that the sodium hydroxide and the oxidizer are added to molten tin and tin alloy step by step until the reaction is completely finished; (2) the granular coarse sodium stannate is dissolved in water; (3) the solution is purified finely; and (4) the fully purified sodium stannate solution is condensed, separated and dried to obtain finished products. The method is used for producing the sodium stannate by using the tin and the tin alloy.

Description

technical field [0001] The invention relates to a method for producing inorganic salts, in particular to a method for producing sodium stannate by using tin and tin alloys. technical background [0002] At present, the production of sodium stannate at home and abroad is based on refined tin as raw material to produce tin salt. When tin is used as raw material to produce sodium stannate, since the melting point of tin is low and the specific gravity is larger than that of alkali, the tin sinks in the pot at the beginning of the reaction. , It is not conducive to the reaction, so that the conversion rate of tin is low, generally only 40-70%. In order to make the reaction go smoothly, the tin flower must be made into tin flower first, and then the tin flower is used to react with sodium hydroxide. Since the chemical reaction is carried out in a solution, the resulting product has a low concentration and must be concentrated to produce a finished product. In addition, when the ...

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Problems solved by technology

There are also some new technologies now such as the patent application number announced by the Chinese Patent Office on November 19, 1986. The patent application number is 85104036 and the title of invention is "The Production Method of Directly Producing Sodium Stannate from Tin Concentrate", which discloses a production method of sodium stannate , the raw material used in this invention is refined tin ore, and the use of refined tin ore will reduce the technological process and reduce the production cost rise compared with tin, but the raw material refined tin ore used is the refined tin ore with a tin content as high as more than 60%. , but this invention is still unavailable for tin alloys with a tin content of about 5% or more

my country is a big producer and user of non-ferrous metals. A large amount of tin alloys with low tin content are produced every year in production and use. If they cannot be effectively used, it will not only waste a lot of precious resources but also cause environmental pollution.

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