Alvin J Lappinga

age ~66

from Concord, CA

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Potassium Fluoride Removal From Potassium Chloride
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US Patent:

49752006, Dec 4, 1990
Filed:

Jan 5, 1990
Appl. No.:

7/461556
Inventors:

Alvin J. Lappinga - Martinez CA
George K. Tyson - Walnut Creek CA
Assignee:

The Dow Chemical Company - Midland MI
International Classification:

B01D 902
B01D 1104
US Classification:

210639
Abstract:

The removal of fluoride ion from potassium chloride containing at least a small amount of an acidic component with water is improved by adjusting the pH of the aqueous solution employed in a fractional crystallization of between about pH6 and about pH9 or adjusting the pH of the extractant used in an aqueous extraction by adding an amount of base so that final pH of the the extract is between about pH6 and about pH9. The fluoride ion contamination of potassium chloride, for example, was reduced from 1000 ppm to 90 ppm by adjusting the aqueous solution employed in a recrystallization of pH6. 5 before precipitation.