Process for preparing selenium salts

Details Process for preparing selenium salts Process for preparing selenium salts

C - Chemistry, Metallurgy

01

B

23/81

C01B 19/00 (2006.01)

Patent

CA 1224008

A B S T R A C T The present invention relates to a method for producing alkali- metal selenite and alkalimetal selenate from metallic selenium through selenious acid. The selenium is dissolved in nitric acid to form selenous acid, which is reacted with an alkalimetal base, to form alkalimetal selenite. The formed selenite is then spray dried. Alternatively, the formed selenite is oxidized at elevated temperature in a basic environment at pH 10-12, with hydrogen peroxide as the oxidant, to form selenate, which is then spray dried. The invention also relates to products produced by the method. The products are intended to be incorporated in animal-fodder or foodstuffs (selenite), or in fertilizers (selenate), to be thus administered to human beings and animals as trace substances.

443930

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