Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1992-10-01
1994-11-08
Langel, Wayne
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
423490, C01F 1122
Patent
active
053624610
ABSTRACT:
Calcium fluoride with high purity of very small content of unreacted calcium carbonate and silica is recovered from an etchant mainly composed of hydrogen fluoride or hydrogen fluoride and ammonium fluoride. The etchant is reacted with calcium carbonate with transfer directions of the etchant and calcium carbonate being controlled within a composition region in which mole equivalent ratio of ammonium fluoride/hydrogen fluoride is specified.
REFERENCES:
patent: 4093706 (1978-06-01), Augustyn et al.
patent: 4098873 (1978-07-01), Hollingsworth
patent: 4120940 (1978-10-01), Warneke
Eto Yoshihiro
Fukutome Toshiro
Harada Hiroyuki
Maeno Matagoro
Miki Nobuhiro
Kurita Water Industries Ltd.
Langel Wayne
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