Lime recovery process

Details Lime recovery process Lime recovery process

C - Chemistry, Metallurgy

01

F

23/282

C01F 11/02 (2006.01) C01B 11/06 (2006.01) C01B 15/03 (2006.01) D06L 3/06 (2006.01)

Patent

CA 1070086

ABSTRACT OF THE DISCLOSURE An improved process for precipitating and recovering lime by reacting an aqueous solution of calcium hypochlorite with an alkaline compound is described. The pH of the resulting lime slurry is maintained in the range from about 11 to about 13.5, whereby hemi-basic calcium hypo- chlorite crystals form in the slurry, and when the slurry is filtered or otherwise separated to recover the lime, an improved filtration rate is obtained. In addition, washing of the lime cake to remove impurities such as sodium chloride is easily accomplished because of the ease of separating wash water in the presence of the hemi-basic calcium hypochlorite crystals.

254350

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