CALCIUM FLUORIDE PRODUCTION PROCESS

CALCIUM FLUORIDE PRODUCTION PROCESS

FIELD: industrial organic synthesis. SUBSTANCE: invention designed for production of fluor-spar starting material for hydrogen fluoride production consists in that calcium carbonate and silicohydrogen fluoride are subjected to reaction in aqueous medium at temperature not higher than 40 C and pH 2.5...

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Bibliographische Detailangaben
Hauptverfasser: BAJBAKOV P.JA, POSKREBYSHEVA I.V, LOGINOV N.D, SINICHENKOV V.F, AFANASENKO B.P, DEDOV A.S, MIKHAJLOVA E.G, SEZEMIN V.A, ZAKHAROVA O.M, VANDYSHEV S.A, MACHEKHIN G.N, ABRAMOV O.B, TSEPELEV E.A
Format: Patent
Sprache:eng ; rus
Schlagworte:
CHEMISTRY
COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:FIELD: industrial organic synthesis. SUBSTANCE: invention designed for production of fluor-spar starting material for hydrogen fluoride production consists in that calcium carbonate and silicohydrogen fluoride are subjected to reaction in aqueous medium at temperature not higher than 40 C and pH 2.5-3.5 to give calcium fluoride as desired product, which is separated from colloidal silica solution. The latter is neutralized to pH not lower than 8, preferably 8.5- 9.5, at temperature not lower than 60 C, preferably 80-90 C, using sodium or calcium hydroxide, the latter being taken in the form of lime milk containing 100-150 g/l CaOm after which silica gel is recovered as second product. EFFECT: improved physico-mechanical properties of colloidal silica solution in the product isolation stage. 5 cl, 2 ex