TiC1_3による水中のSe(VI)の還元・除去

概要

論文の詳細を見る
The Japanese government office enacted in 1994 that the effluent standard for selenium was 0.1 mg / l. This was an serious problem in the copper refineries, because they discharge a large amount of effluent containing the selenium ions higher than the standard. A provisional standard of 20 mg / l and then 1 mg / l has been applied to the industries, and the moratorium will finish within a few years. In order to clear the general standard, various methods were examined and investigated. According to the efforts, the process for the effluent containing Se(IV) is developed. The effluent containing Se(VI) is, however, difficult to fill the general standard by the practical method up to this time. We studied the reduction of Se(VI) by TiCl3, and the following results were obtained. (1) Se(VI) is quickly reduced to amorphous Se at the room temperature. (2) The reduction is of the first order. (3) The reduction rate is depended on the excess TiCl3. (4) Coexisting HCl and H2SO4 depresses the reaction rate. (5) H2Se evolves when the pH is high and the excess TiCl3 is large.
社団法人資源・素材学会の論文
2000-09-25