Method of obtaining granulated and defluorated phosphogypsum

Details Method of obtaining granulated and defluorated phosphogypsum Method of obtaining granulated and defluorated phosphogypsum

B - Operations, Transporting

01

J

23/60, 261/71

B01J 2/28 (2006.01) C01F 11/46 (2006.01) C04B 11/00 (2006.01)

Patent

CA 1084236

ABSTRACT OF THE DISCLOSURE: The invention is concerned with a method for the production of granulated and defluorated phosphogypsum for thermal processing. The method of the invention comprises preliminarily drying phosphogypsum, at a temperature in the range of 100°C to 150°C, to a residual moisture content of from 0.5 to 10 percent; mixing the preliminarily dried phosphogypsum with sulfuric acid of concentration range 55 to 98%, and granulation-binding additives, in aqueous solution, the sulfuric acid being added in amounts of from 0.5 to 15 weight parts and the binding additives being added in amounts of from 0.01 to 6 weight parts per 100 parts of the phosphogypsum, the binding additives being selected from the group consisting of carbamide,ammonium nitrate, carboxymethylcellulose, calcium nitrate, polyethylene oxide and the distillation fluids from soda production; granulating the mixture; and then heating the granules to a temperature in the range of 170°C to 700°C to drive off fluorine-containing gases and to strengthen the granules for subsequent thermal processing in fluidized beds.

280739

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