C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
23/122, 23/282
C04B 11/00 (2006.01)
Patent
CA 1098283
ABSTRACT OF THE DISCLOSURE The invention is concerned with a method of fluidised bed processing of phosphogypsum into sulphur dioxide and calcium oxide, which comprises (a) preliminary drying humid phosphogypsum; (b) mixing the preliminary dried phosphogypsum with 0.01 to 6% by weight of granulation-binding additives, in aqueous solution, and optionally with 1 to 15% by weight of carbon-containing materials and with 2 to 25% by weight of sulphur-containing raw materials, the weight percentages being based on the weight of the phosphogysum, the binding additi- ves being selected from the group consisting of carbamide, carboxymethyl cellulose, ammonium bitrate, calcium nitrate, polyethylene oxide and the distillation fluids from soda production; (c) granulating the mixture; (d) subjecting the granules to a thermal treatment at 100-700°C for 10-90 minutes; (e) screening the thermally treated granukes to isolate a fraction having 1-3 mm size range; and (f) subjecting the iso- lated fraction to a thermal dissociation in fluidised bed, in the presence of propane-butane gas mixture as a reducer. The method of the invention enables one to carry out the ther- mal dissociation of the phosphogysum granules at temperatures as high as 1300°C, without the occurrence of any sintering of the charge. The possibility of working at such high tempera- tures allows to significantly increase the degree and the rate of dissociation of the phosphogypsum into sulphur dioxide and calcium oxide.
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Bakalova Yovka P.
Dombalov Ivan P.
Grancharov Ivan N.
Pelovski Yoncho G.
Videnov Nikola B.
Robic Robic & Associes/associates
Vish Chimiko Technologicheski Institute
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