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| This efficient, high yield process technology has higher recovery of fluorine from the fluosilicic acid (FSA) and produces low silica calcium fluoride --- ideal as the fluorine source in fluorochemicals and fluoropolymers manufacture. The process involves mixing aqueous fluosilicic acid with phosphate rock containing fluorapatite at moderate conditions to produce a second mixture containing the calcium fluoride.calcium fluoride three steps(a) mixing aqueous H3PO4with H2SiF6to mixture concentration H3PO4is least moles/liter (b) adding phosphate rock rate pH maintained less 10 temperature sufficient second and(c) separating current naturally occurring typically composed tricalcium (Ca3(PO4)2) carbonate (CaCO3) (CaF2) |
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