Refining method for removing chlorate from perchlorate

Abstract

The present invention discloses a refining process for removing chlorate from perchlorate. According to the content of chlorate in the perchlorate the stoichiometric metasulfite solution or solid can be added, and reacted with chlorate to decompose the chlorate into the compound which can be easily dissolved in water. The perchlorate in the product does not produce reaction with said compound, and the small quantity of acid produced by reaction can be neutralized by alkali to make pH value of solution be 7-9, the content of chlorate in the perchlorate can be controlled in below 0.003% (by chloride) so as to reach to the index of high-quality product.

Description

technical field

[0001] The invention relates to a refining method for removing chlorate from perchlorate. Background technique

[0002] The existing production method of perchlorate mostly adopts the technique of electrolyzing saturated solution of chlorate. The perchlorate produced by this method often contains a certain amount of chlorate. The existing method for removing chlorate is to recrystallize the crude product of perchlorate, but the perchloric acid in this refining method product Salt (calculated as chlorine) is still as high as 0.4%, which is stated in Volume 11 of the Chinese Chemical Encyclopedia. And the content of chlorate in the national high-quality product can only be below 0.02%, and the content of chlorate in the fireworks products of countries such as Europe and the United States is required to be lower than 0.003%, so the existing refining method can not reach the requirement of national high-quality product, More can not rea...