Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1975-06-02
1977-08-02
Thomas, Earl C.
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423167, 423320, 423555, C01B 2516
Patent
active
040396169
ABSTRACT:
Calcium sulphate produced by reacting crude phosphate with sulphuric acid is washed with aqueous solutions of condensed and complex aluminium fluorides of the general formulae MeAlF.sub.4, Me.sub.2 AlF.sub.5 and Me.sub.5 Al.sub.3 F.sub.14 as well as AlF.sub.3.nH.sub.2 O, in which Me represents an alkali metal, ammonium or thallium-I ion and n is a number between 1 and 9.
REFERENCES:
patent: 3512927 (1970-05-01), Betts
patent: 3552918 (1966-11-01), Fitch et al.
patent: 3671189 (1972-06-01), Betts
patent: 3795728 (1974-03-01), Scheel
patent: 3972981 (1976-08-01), Harper et al.
Scheel Kurt
Wirsching Franz
DeLaurentis Anthony J.
Gebr. Knauf Westdeutsche Gipswerke
Langel Wayne A.
Thomas Earl C.
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