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    • 5. 发明授权
    • Removal of P.sub.2 O.sub.5 from aluminum fluoride enriched
crystallization mother liquors
    • 从氟化铝富集的结晶母液中除去P'2'O'5'
    • US3965248A
    • 1976-06-22
    • US496447
    • 1974-08-12
    • Tadeusz K. WiewiorowskiMichael O. Nutt
    • Tadeusz K. WiewiorowskiMichael O. Nutt
    • C01B25/37C01F7/50C01B25/26C01G29/00
    • C01B25/37C01F7/50
    • Aqueous AlF.sub.3 enriched crystallization mother liquors contaminated with P.sub.2 O.sub.5 values and having less than 5% free acidity are treated with a material which provides bismuth ions in the mother liquor in amounts small enough to insure that the Bi/PO.sub.4 mole ratio remains below about 1.05. Under these conditions, the bismuth and P.sub.2 O.sub.5 react essentially quantitatively to form a BiPO.sub.4 precipitate by which the P.sub.2 O.sub.5 can be separated from the mother liquor. Bismuth can be regenerated from the BiPO.sub.4 and recycled for further use in the process.The invention finds utility in the preparation of AlF.sub.3 by the reaction of an aluminum ore and P.sub.2 O.sub.5 contaminated HF or H.sub.2 SiF.sub.6 such as that available as a by-product of wet process phosphoric acid manufacture. The AlF.sub.3 reaction product is recovered by a crystallization step which, because it is normally only about 70 to 90% efficient, produces a mother liquor containing substantial amounts of AlF.sub.3. For economic reasons, this mother liquor is usually recycled to the process. However, the P.sub.2 O.sub.5 introduced with the HF or H.sub.2 SiF.sub.6 reactant appears in the AlF.sub.3 enriched mother liquor and prevents recycle of the mother liquor for fear of contaminating the AlF.sub.3 product with P.sub.2 O.sub.5. The bismuth treatment of the present invention permits the recycle of the mother liquor to recover its AlF.sub.3 content by reducing the P.sub.2 O.sub.5 level, without leaving undesirably high levels of bismuth contaminants in the recycled mother liquor.