Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1980-05-01
1981-08-18
Carter, Herbert T.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423167, 423319, 423320, C01B 2546, C01B 2522
Patent
active
042846145
ABSTRACT:
High quality phosphoric acid is produced from phosphate rock and high alumina pebble which is a byproduct of phosphate rock mining operations. The rock or pebble with or without comminution is digested in phosphoric and sulfuric acid and the resultant phosphoric acid contains the metallic ions normally present in the treated rock and pebble. The metallic ions are then extracted from the acid by ion exchange with a water-immiscible organic sulphonic acid compound (preferably in the presence of an organophosphate or phosphonate). After phase separation the organic phase containing the extracted metallic ions can be regenerated. The process is especially useful when the digestion is done at a P.sub.2 O.sub.5 concentration and temperature which produces calcium sulfate hemihydrate.
REFERENCES:
patent: 1894514 (1933-01-01), Heckenblerkner
patent: 2013970 (1935-09-01), Moore
patent: 2288752 (1942-07-01), Simpson
patent: 3694153 (1972-09-01), Williams et al.
patent: 3792151 (1974-02-01), Case
van Dalen et al., "Proceedings of the International Solvent Extraction Conference", The Hague, 1971, vol. II, pp. 1096-1100.
Bisson Barry A.
Carter Herbert T.
Grannen, Jr. Edward A.
Lane William G.
Occidental Petroleum Corp.
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