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 3/06 (2006.01) D21C 3/02 (2006.01) D21C 11/12 (2006.01)

Patent

CA 1061962

REMOVAL OF SODIUM CHLORIDE FROM PULP MILL SYSTEMS ABSTRACT OF THE DISCLOSURE Smelts produced in spent pulping liquor recovery operations and containing sodium chloride are treated to remove sodium chloride therefrom in pure form while the loss of usable components is avoided. A solid mixture of sodium chloride, sodium carbonate and sodium sulphate is provided as such in a soda mill, or first is separated from sodium sulphide, by fractionating the smelt where sodium sulphide is present, as in the Kraft mill. The solid mixture is leached at a high temperature to remove all the sodium chloride values therefrom, along with part of the sodium carbonate and sodium sulphate. Pure sodium chloride is deposited by cooling the leach liquor and the mother liquor is recycled to the leaching step.

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