Method for manufacture of phosphoric acid from phosphate rock

Details Method for manufacture of phosphoric acid from phosphate rock Method for manufacture of phosphoric acid from phosphate rock

1977-01-24

1978-08-22

Padgett, Benjamin R.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Radioactive metal

423 11, 423 18, 423 20, 423308, 423309, 423319, 423320, 423167, 423635, C01G 4300

Patent

active

041089570

ABSTRACT:
A method is disclosed for the manufacture of phosphoric acid directly from phosphate rock wherein the crushed phosphate rock is mixed with dilute phosphoric acid to form a slurry and the slurry is then heated to produce calcium monophosphate. Thereafter, oxalic acid is added to the slurry to precipitate the calcium therein as calcium oxalate which is separated. The liquid resulting therefrom which contains the phosphoric acid from the rock is then treated conventionally to recover the phosphoric acid therein.

REFERENCES:
patent: 2882123 (1959-04-01), Long
patent: 3311450 (1967-03-01), Alon et al.
patent: 3363978 (1968-01-01), De Rooij et al.
patent: 3792151 (1974-02-01), Case
patent: 3928016 (1975-12-01), Michel
patent: 4012491 (1977-03-01), Hauge
patent: 4044107 (1977-08-01), Houghtaling

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