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2 226 502

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(51)

IPC

(21) (22)

Application

2002119988/15, 2002-07-22

(24)

Start date

2002-07-22

(22)

Actual filing date

2002-07-22

(45)

Published

2004-04-10

(72)

Inventor

Ol'Shanskij V.A.Krupin A.G.Lazarchuk V.V.

(73)

Holder

Federal'Noe Gosudarstvennoe Unitarnoe Predprijatie Khimicheskij Kombinat" Ministerstva Rossijskoj Federatsii Po Atomnoj Ehnergii

METHOD FOR PREPARING SODIUM SILICOFLUORIDE Russian patent published in 2004 - IPC

Abstract RU 2226502 C1

FIELD: inorganic chemistry, chemical technology. SUBSTANCE: invention relates to technology for preparing sodium silicofluoride from fluosilicic acid solutions formed at the stage of an aqueous absorption of gases in producing hydrogen fluoride and phosphoric acid containing SiF₄ and HF. Invention is directed to the preparing easily filtering sodium silicofluoride of the high quality. Sodium silicofluoride is prepared by interaction of fluosilicic acid and sodium hydroxide in the mole ratio of fluorine to silicon = 6: 1 and by changing pH up to a single value in the range 5.0-6.5. EFFECT: improved preparing method. 2 cl, 1 tbl, 4 ex

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RU 2 226 502 C1

Authors

Ol'Shanskij V.A.

Krupin A.G.

Lazarchuk V.V.

Dates

2004-04-10—Published

2002-07-22—Filed