| 摘要 |
PCT No. PCT/SE83/00400 Sec. 371 Date Aug. 22, 1984 Sec. 102(e) Date Aug. 22, 1984 PCT Filed Nov. 15, 1983 PCT Pub. No. WO84/02513 PCT Pub. Date Jul. 5, 1984.Method for producing alkali metal selenite and alkali metal selenate from metallic selenium through selenous acid. The selenium is dissolved in nitric acid to form silenous acid, which is reacted with an alkali metal base to from alkali metal 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 (solenite), or in fertilizers (selenate), to be thus administered to human beings and animals as trace substances. |
