C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
23/170
C01D 3/14 (2006.01)
Patent
CA 1144738
ABSTRACT OF THE DISCLOSURE Industrially produced potassium chloride particles containing a minor contaminating amount of sodium chloride are treated to substantially reduce the sodium chloride content of such particles. The disclosed treat- ment comprises, (1) introducing an aqueous slurry of the potassium chloride particles into the top of a leaching column, (2) contacting the particles countercurrently with an aqueous leaching salt solution that is saturated with respect to potassium chloride and contains less than 45 grams of sodium chloride per liter of solution, (3) removing aqueous effluent from near the top of the leaching column and utilizing said effluent for the preparation of further potassium chloride slurry that is introduced to the leaching column, (4) removing a slurry of potassium chloride particles sub- stantially reduced in sodium chloride content from near the bottom of the leaching column, (5) separating and optionally washing leached potassium chloride particles from the mother liquor of the slurry removed from the bottom of the leaching column and recycling the mother liquor to the leach- ing column as leaching salt solution, and (6) drying the potassium chloride particles obtained in step (5), thereby obtaining potassium chloride par- ticles substantially reduced in sodium chloride content.
380450
Borden Ladner Gervais Llp
Ppg Industries Canada Ltd.
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