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2 010 003

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IPC

(21) (22)

Application

4941059/26, 1991-06-03

(22)

Actual filing date

1991-06-03

(45)

Published

1994-03-30

(72)

Inventor

Ustjugova L.M.Kharitonov V.P.Strekalov A.I.Suvorova T.Ju.Kuznetsova T.A.

(73)

Holder

Permskij Filial Nauchno-Proizvodstvennogo Ob"Edinenija Institut Prikladnoj Khimii" Mezhotraslevogo Gosudarstvennogo Ob"Edinenija

METHOD OF CALCIUM FLUORIDE PRODUCTION Russian patent published in 1994 - IPC

Abstract RU 2010003 C1

FIELD: chemical technology. SUBSTANCE: aqueous suspension of calcium carbonate is treated with hexafluorosilicic acid solution by two stages. At the first stage treatment is carried out with a mixture of hexafluorosilicic acid and clarified solution obtained from the second stage. Precipitate is separated and treated with hexafluorosilicic acid taken at concentration 20-50% of stoichiometrically required at 40-80 C. Obtained calcium fluoride has, wt. -% : CaF₃ 95.6-98.6; CaCO₃ 0.2-0.6, and SiO₂ 0.8-1.2. Utilization degree is 94.7-95.0% . Method is used in hydro- gen fluoride reprocessing. EFFECT: improved method of production. 1 tbl

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RU 2 010 003 C1

Authors

Ustjugova L.M.

Kharitonov V.P.

Strekalov A.I.

Suvorova T.Ju.

Kuznetsova T.A.

Dates

1994-03-30—Published

1991-06-03—Filed