Method for treating fgd waste to produce alpha plaster and...

Details Method for treating fgd waste to produce alpha plaster and... Method for treating fgd waste to produce alpha plaster and...

C - Chemistry, Metallurgy

01

F

C01F 11/46 (2006.01) C01B 17/50 (2006.01) C04B 11/26 (2006.01)

Patent

CA 2158881

A continuous process is provided for producing sulphur dioxide and alpha calcium sulphate hemi-hydrate from calcium sulphite usually produced in a waste material from flue gas desulphurization consisting of treating the calcium sulphite directly to alpha calcium sulphate hemi-hydrate using a range of temperatures from 77°C to 125°C, a range of acidity of 10 percent to 35 percent sulphuric acid and a time of 5 to 120 minutes. The optimum results being achieved when the conditions utilize a temperature that is about 80°C, sulphuric acid content is about 35 percent, and time required is about 60 minutes.

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