Reclamation of phosphate from bright dip drag-out

Details Reclamation of phosphate from bright dip drag-out Reclamation of phosphate from bright dip drag-out

C - Chemistry, Metallurgy

01

B

149/20, 23/67

C01B 25/44 (2006.01)

Patent

CA 1090984

Abstract of the Disclosure Rinse acid collected from an aluminum bright dip- ping operation is reacted with soda alkalies at 80°C or higher to yield a solution of trisodium phosphate, Na3PO4, sodium aluminate, NaAIO2, sodium nitrate, NaNO3, and trace insolubles. The hot solution is quickly filtered to remove all insoluble impurities and then cooled so that the tri- sodium phosphate crystallizes out which, after filtering, leaves a mother liquor containing some remaining trisodium phosphate and soluble impurities, namely, sodium aluminate and sodium nitrate. The mother liquor is then recycled repeatedly with further batches of rinse acid to maximize the phosphate recovery. i.

276097

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