Process for removing phosphorus from phosphorus-containing fluorite
AssigneeCentral Glass Company, Limited
InventorsToshiyuki Shibata, Hiroshi Ono, Kenji Isoyama
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Abstract
A process for removing a phosphorus component from fluorite containing such phosphorus component, which process comprises adding powder of the fluorite to an aqueous acid solution having an acid concentration of from 1.0 to 20 Wt% in an inorganic acid/phosphorus ratio of above 25:1 by mole to give a slurry, agitating the slurry at a temperature below 50.degree. C., and collecting the powder from the slurry. The mother liquor obtained after separation of the powder from the slurry may be recycled to the first step.
Claims7
A process for removing a phosphorus impurity from fluorite, the process comprising adding powder of fluorite containing the phosphorus impurity to an aqueous solution of an inorganic acid having an acid concentration of from 1.0 to 20 Wt% in an inorganic acid/phosphorus ratio of above 25:1 by mole to give a slurry, agitating the slurry at a temperature below 50.degree. C., and collecting the powder from the slurry.
Dependencies are inferred from the claim text.