Production of metal fluorides from fluosilicic acid
AssigneeBayer Aktiengesellschaft
InventorsWolf Becker, Heinz Jonas, Wolfgang Weiss
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Abstract
A process which comprises reacting at a temperature above 100.degree.C. a metal oxide, hydroxide or a mixture thereof with aqueous fluosilicic acid, said fluosilicic acid having a concentration of about 10 to 45% by weight, to form gaseous silicon tetrafluoride and the corresponding metal fluoride and recovering said metal fluoride from the reaction medium.
Claims3
A process which comprises heating a metal oxide, hydroxide or mixture thereof wherein the metal is selected from the group consisting of aluminum, calcium, chromium and uranium in aqueous fluosilicic acid, to about 140.degree. to 240.degree.C at a pressure of from 5 to 30 atmospheres gauge, said fluosilicic acid having a concentration of about 10 to 45% by weight and being present in a 1 to 20% stoichiometric excess, based on the metal oxide, hydroxide or mixture thereof, whereby silicon tetrafluoride is removed from said fluosilicic acid in gaseous form and the remaining hydrogen fluoride in said aqueous solution forms the corresponding metal fluoride and recovering said metal fluoride from the reaction mixture.
Dependencies are inferred from the claim text.