Potassium fluoride removal from potassium chloride

Details Potassium fluoride removal from potassium chloride Potassium fluoride removal from potassium chloride

1990-01-05

1990-12-04

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

23296, 23302R, 423499, B01D 902, B01D 1104

Patent

active

049752006

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.

REFERENCES:
Yoshiharu et al., Japanese Application 53 033995, Published Mar. 30, 1978, (Derwent Abstracts, XRAM Acc No. C78-A34220 and Chem. Abs., 89, 26936x (1978).
Kirk-Othmer Encyclopedia of Chemical Technology, Third Edition, 18, pp. 933-935.

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