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

1975-10-15

1977-08-23

Vertiz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423308, 134 13, 156642, 423305, C01B 1516, B08B 704

Patent

active

040441067

ABSTRACT:
Rinse acid collected from an aluminum bright dipping operation is reacted with soda alkalies at 80.degree. C or higher to yield a solution of trisodium phosphate, Na.sub.3 PO.sub.4, sodium aluminate, NaAlO.sub.2, sodium nitrate, NaNO.sub.3, and trace insolubles. The hot solution is quickly filtered to remove all insoluble impurities and then cooled so that the trisodium 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.

REFERENCES:
patent: 1676556 (1928-07-01), Howard
patent: 1897705 (1933-02-01), Mandlen et al.
patent: 2050249 (1936-08-01), Adler
"Quality and Cost Improvement in the Aluminum Bright Anodizing Process," Nelson et al., Plating, Jan. 1966, p. 72-77.
"Spent Phosphoric Acid: To Recover or Not to Recover" Monsanto Bright Dip, vol. 2, Issue 2.

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