Chemistry of inorganic compounds – Treating mixture to obtain metal containing compound – Alkaline earth metal
Patent
1986-09-02
1987-10-27
Doll, John
Chemistry of inorganic compounds
Treating mixture to obtain metal containing compound
Alkaline earth metal
C01B 2516
Patent
active
047028963
ABSTRACT:
An improved, substantially more energy efficient, thermal treatment process for use on relatively high organic content phosphate rock is herein taught wherein such rock is heated in two stages under controlled conditions to thereby yield an improved calcined product rendered more suitable for subsequent processing into wet-process phosphoric acid by, for example, acidulation with a mixture of phosphoric and sulfuric acids. The two-stage thermal treatment of the instant invention has been demonstrated to be especially beneficial when applied to an apatitic phosphate rock possessing a high content of organic matter and a high degree of carbonate substitution in the apatite crystal lattice thereof. It now has been discovered that by utilizing heating conditions considerably milder than those that are suggested by the teachings of the prior art, the practice of the instant improved process requires less externally supplied energy that such prior art calcination processes while still yielding calcined products of at least, and in most cases, greater than equivalent quality.
REFERENCES:
patent: T105602 (1985-07-01), Mair
patent: 3995987 (1976-12-01), MacAskill
patent: 4017585 (1977-04-01), Angevine et al.
patent: 4321238 (1982-03-01), Henin
patent: 4325928 (1982-04-01), Lowe
patent: 4389380 (1983-06-01), Parks
Doll John
Langel Wayne A.
Petrusek Robert A.
Tennessee Valley Authority
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