Method of stabilizing wet process phosphoric acid for solvent ex

Details Method of stabilizing wet process phosphoric acid for solvent ex Method of stabilizing wet process phosphoric acid for solvent ex

1980-06-30

1982-04-27

Vertiz, O. R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 9, 423 10, 423 63, 423321S, B01D 1100, C01G 5600, C22B 6002, C01B 2516

Patent

active

043270611

ABSTRACT:
A method of stabilizing wet process phosphoric acid containing acid soluble impurities preparatory to solvent extraction for the recovery of valuable minerals. The acid is introduced into a vessel containing crystal seed bed of the impurities. A portion of the acid then is withdrawn and concentrated to effect supersaturation of the impurities contained therein. The supersaturated acid is returned to the vessel to mix with the remaining solution and cause additional impurities to precipitate. Thereafter, a portion of the solution, containing precipitated impurities, is withdrawn and introduced into a separator. In the separator, the solution is separated into an essentially solids-free stream containing unprecipitated soluble impurities and a solids-containing stream. The solids-free stream is admixed with an aqueous diluent to dilute it to a concentration level below the concentration at which the precipitable impurities are saturated therein but without a substantial change in phosphate concentration to thereby stabilize the acid stream. The stabilized acid is contacted with an organic extractant to selectively extract at least one of the remaining unprecipitated soluble impurities without substantial precipitation of any other of the remaining soluble impurities.

REFERENCES:
patent: 3206282 (1965-09-01), Crawford et al.
patent: 3607029 (1971-09-01), Goret et al.
patent: 3684439 (1972-08-01), Rose et al.

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