METHOD OF GYPSUM UTILIZATION FROM THE WASTE OF HYDROFLUORIC ACID OR ANHYDROUS HYDROGEN FLUORIDE PRODUCTION Russian patent published in 1995 - IPC

Abstract RU 2046097 C1

FIELD: chemical technology. SUBSTANCE: method involves solid-phase neutralization of gypsum waste which is neutralized with self-decomposing ferroalloy slag up to the pH value 9.5-10.0. For this purpose 25-30% slag is required. Addition of self-decomposing slag to the acid waste of hydrogen fluoride product up to pH 9.5-10.0 ensures to obtain articles with strength 10-15 MPa and resistance to cold up to 100 cycles. Method ensures elimination of lime, catalyst and milling mixture in the ball mill. EFFECT: decreased cost of process. 1 tbl

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RU 2 046 097 C1

Authors

Levchenko Anatolij Vasil'Evich

Ovchinnikova Valentina Filippovna

Dates

1995-10-20—Published

1992-01-27—Filed