METHOD FOR PRODUCTION OF CRYOLITE Russian patent published in 1995 - IPC

Abstract RU 2036840 C1

FIELD: production of fluorine salts. SUBSTANCE: sodium silicofluoride is treated with aqueous solution of sodium carbonate with sodiumsilicofluoride-to-sodium carbonate mass ratio of 1:(2.25-2.37), process temperature of 50-60 C for 30-60 min. Silicon dioxide is separated from solution, with sodium fluoride concentration in solution maintained at the level indicated in invention description. Cryolite is precipitated from solution by means of sodium aluminate. Method allows use of sodium silicofluoride in form of byproduct of superphosphate and cryolite plants for production of cryolite of improved quality. EFFECT: higher efficiency. 2 tbl

Similar patents RU2036840C1

Title	Year	Author	Number
METHOD FOR OBTAINING ALUMINUM-SILICON ALLOY AND SODIUM-ALUMINUM FLUORIDES IN ELECTROLYZER FOR PRODUCTION OF ALUMINUM	1992	Kulikov B.P. Istomin S.P. Kustov V.I. Dorofeev V.V. Grinberg I.S. Gromov B.S. Kim V.I.	RU2047671C1
CRYOLITE PRODUCTION PROCESS	2000	Kulikov B.P. Grinberg I.S. Skornjakov V.I. Ragozin L.V. Maksjutov E.N. Efimov A.A. Gorkovenko V.I. Borovik V.A. Tenigin A.Ju. Rzhechitskij Eh.P. Kozlova L.S.	RU2193526C2
METHOD FOR PRODUCTION OF ALUMINIUM-SILICON ALLOY IN ELECTROLYZER FOR ALUMINIUM PRODUCTION	1992	Istomin S.P. Kulikov B.P. Grinberg I.S. Ragozin L.V. Skornjakov V.I. Zaruba A.A.	RU2037569C1
METHOD OF PREPARING OF ALUMINIUM-SILICON ALLOY IN ELECTROLYZER FOR ALUMINIUM PRODUCTION	0	Istomin Stanislav Pavlovich Kulikov Boris Petrovich Kustov Vladimir Ilich Kokhanovskij Sergej Arkadevich Ragozin Leonid Viktorovich	SU1826998A3
METHOD OF PROCESSING OF SODIUM-FLUORINE-CARBON-CONTAINING WASTE OF ELECTROLYTIC PRODUCTION OF ALUMINIUM	2016	Kulikov Boris Petrovich	RU2624570C1
METHOD OF DISPOSING PRODUCTION WASTE CONTAINING FLUOROSILICATES	2016	Bispen Tatyana Alekseevna Kotelnikov Stanislav Evgenevich Moldavskij Dmitrij Dmitrievich	RU2641819C2
METHOD OF PROCESSING FLUOROCARBON-CONTAINING ALUMINIUM PRODUCTION WASTES	2015	Kulikov Boris Petrovich	RU2586389C1
METHOD FOR SYNTHESIS OF SODIUM SILICOFLUORIDE	2009	Mustafin Akhat Gaziz'Janovich Sharipov Tagir Vil'Danovich	RU2411183C1
MIXTURE FOR ALUMINIUM ELECTROLYZERS	1993	Istomin S.P. Ragozin L.V. Grinberg I.S. Sanikovich Ju.A.	RU2049159C1
METHOD OF PRODUCING SODIUM SILICOFLUORIDE	2012	Sharipov Tagir Vil'Danovich Mustafin Akhat Gaziz'Janovich Shajakhmetov Dim Idelovich	RU2492142C1

RU 2 036 840 C1

Authors

Istomin S.P.

Kozlova L.S.

Borovik V.A.

Ragozin L.V.

Dates

1995-06-09—Published

1993-01-18—Filed