Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1974-03-25
1976-10-05
Vertiz, Oscar R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423167, C01B 2516
Patent
active
039845257
ABSTRACT:
Production of phosphoric acid by the wet process and by-product calcium sulphate hemihydrate. Sulphuric acid reacts with phosphate rock in such conditions that gypsum is precipitated, the resulting slurry is transferred to a second vessel in which the conditions are such that the gypsum recrystallises to calcium sulphate hemihydrate. Calcium sulphate hemihydrate so produced may be converted to cement and sulphuric acid by a process analogous to the anhydrite process for production of sulphuric acid. The phosphoric acid produced may be desulphated in a process integrated with the phosphoric production.
REFERENCES:
patent: 3124419 (1964-03-01), Germaine et al.
Thomson Alexander
Williams Thomas Alan
Albright & Wilson Limited
Goodman Herbert H.
Heller Gregory A.
Vertiz Oscar R.
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