Preparation method for high purity stannous oxide

Abstract

The invention provides a method for preparing high-purity stannous oxide that is applicable to the electronic industry, which comprises the following steps: tin powder, chlorine gas and water are synthesized to be stannic chloride in the environment that is provided with hydrochloric acid; the stannic chloride is reduced with equal or more tin powder to be stannous chloride; after the filtration, the concentration of the stannous chloride solution is adjusted, and antioxidant is added into the stannous chloride solution; finally the stannous chloride solution is slowly dropped into sodium hydroxide solution; the pH value at the reaction termination is controlled; the filtered precipitate is centrifuged, washed and dried to get stannous oxide. The stannic chloride is prepared by oxidation and restoration, so that the copper, arsenic and stibium contained in the tin powder can be removed; the ions such as zinc, iron, lead, and the like are separated from the precipitate of the stannous oxide through controlling the pH value at the reaction termination of the stannous chloride and the sodium hydroxide. The method is simple to be operated, and the process parameters are easy to be controlled. The purity of the stannous oxide that is obtained in the method can reach more than 99 percent, and the content of each foreign matter is less than 0.001 percent, thereby being applicable to the electronic industry.

Description

technical field [0001] The invention relates to a preparation method of a tin compound, in particular to a preparation method of stannous oxide, and more particularly to a preparation method of high-purity stannous oxide suitable for use in the electronics industry. Background technique [0002] Stannous oxide is often used as a reducing agent and catalyst, and is also used to prepare stannous salts and battery electrode materials; stannous oxide is also widely used in electroplating and glass industries. The stannous oxide suitable for use in the electronics industry requires high purity, especially the content of metal impurities should be less than 0.001%. Stannous oxide is a metastable substance, which does not exist in nature and needs to be prepared by the reaction of tin salt and alkali. The traditional method for preparing stannous oxide is: adopt metal tin and hydrochloric acid reaction to obtain stannous chloride, then react stannous chloride with sodium hydroxide...

AI Technical Summary

Problems solved by technology

Chinese patent CN85106332 discloses a preparation method of tin protochloride, which uses metal tin, chlorine gas and water to react in the presence of hydrochloric acid to generate tin chloride, then adds metal tin as a reducing agent, and under the same conditions, generates tin chloride Sn; although this method can remove metal impurities such as copper, antimony and arsenic, the removal of lead adopts the method of multiple precipitation, which not only introduces new ions, but also increases the steps of product separation. In addition, the method Also powerless to remove iron and zinc