Process for the preparation of basic zirconium carbonate of high purity
AssigneeTh. Goldschmidt AG
InventorJurgen Fenner
Life of this patent
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Abstract
A method for preparing a high purity basic zirconium carbonate comprising (a) adding alkali or ammonium carbonate or alkali or ammonium hydrogen carbonate to an aqueous solution of zirconium sulfate to precipitate basic zirconium sulfate; (b) dissolving the basic zirconium sulfate in HCl solution and heating the solution to reprecipitate the basic zirconium sulfate; (c) suspending the precipitated basic zirconium sulfate in water and adding alkali or ammonium carbonate or alkali or ammonium hydrogen carbonate to the suspension to produce basic zirconium carbonate. The process provides a simple and economical means of producing a very high purity basic zirconium carbonate.
Claims14
A process for the preparation of high purity basic zirconium carbonate comprising:
- (a) precipitating basic zirconium sulfate by adding a compound selected from the group consisting of alkali or ammonium carbonate and alkali or ammonium hydrogen carbonate to an aqueous solution of zirconium sulfate and separating the precipitate from the mother liquor;
- (b) dissolving the basic zirconium sulfate from step (a) at temperatures not more than about 40.degree. C. in a 0.3 N to 1 N HCl solution such that 0.5 to 1.5 liters of HCl solution is used for each mole of zirconium sulfate used in step (a), and then heating the solution to a temperature of at least 45.degree. C. to reprecipitate the basic zirconium sulfate and separating the precipitate;
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- (c) suspending the basic zirconium sulfate in water to which the stoichiometric amount of a compound selected from the group consisting of alkali or ammonium carbonate and alkali or ammonium hydrogen carbonate is added and removing the basic zirconium carbonate formed from the solution wherein said basic zirconium carbonate contains substantially less impurities, based on the zirconium oxide content, than were present in the zirconium sulfate solution of step (a).
Dependencies are inferred from the claim text.