Sodium chloride removal in pulp mill systems

Details Sodium chloride removal in pulp mill systems Sodium chloride removal in pulp mill systems

D - Textiles, Paper

21

C

9/36.3

D21C 11/00 (2006.01) C01D 3/04 (2006.01) C01D 3/06 (2006.01) D21C 3/02 (2006.01) D21C 11/12 (2006.01)

Patent

CA 1061512

SODIUM CHLORIDE REMOVAL IN PULP MILL SYSTEMS ABSTRACT OF THE DISCLOSURE Smelts produced in Kraft mill and soda mill spent pulping liquor recovery operations and containing sodium chloride are treated to remove sodium chloride therefrom in pure form while the removal of usable components is avoided. A solid mixture of sodium chloride, sodium carbonate and sodium sulphate is provided in the case of the soda mill, or first is separated from the sodium sulphide in the case of the Kraft mill. Thereafter, the solid mixture is leached to remove the sodium carbonate and sodium sulphate while leaving the sodium chloride in a substantially pure form, the resulting leach liquor being refrigerated to deposit sodium carbonate and sodium sulphate. The mother liquor, after removal of the deposited salts is recycled to the solid mixture leaching step. - 1 -

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