PROCESS FOR PRODUCING ALKALI-METAL SELENATE

摘要

A process for producing alkali-metal selenate by oxidizing selenium powder with hydrogen peroxide and neutralizing the selenic acid thus formed with alkali-metal hydroxide or carbonate in which, in a first step, reaction of the selenium powder is effected on the surface of heated hydrogen peroxide in a receptacle and partial neutralization of the acid solution formed and, in a second step, the residual amounts of selenite are subsequently reacted with hydrogen peroxide to selenate.