Pyrite cathode material for a thermal battery

Details Pyrite cathode material for a thermal battery Pyrite cathode material for a thermal battery

1991-02-07

1992-09-29

Straub, Gary P.

Chemistry of inorganic compounds

Sulfur or compound thereof

Binary compound

423565, 429218, H01M 4300, C01B 1700

Patent

active

051512629

ABSTRACT:
High purity synthetic pyrite is produced in a two-step and also in a one-step sulfidation reaction of iron powder. In a two-step process, a hydrogen-annealed iron powder is first reacted with molten sulfur at a temperature of from about 200.degree.-455.degree. C., while subjecting the reaction mass to mixing for a period sufficient to convert the iron powder to pyrrhotite, which is then reacted in a second step with sulfur vapor at a temperature of from about 420.degree.-550.degree. C., while subjecting the reaction mass to mixing for a period sufficient to convert the pyrrhotite to substantially pure pyrite. In a one-step process, iron powder is gradually heated from room temperature to about 550.degree. C. in the presence of sulfur while continuously mixing to prevent sintering and agglomeration.

REFERENCES:
patent: 3898096 (1975-08-01), Heredy et al.
patent: 3907589 (1975-09-01), Gay et al.
patent: 4119769 (1978-10-01), Schneider et al.
patent: 4649227 (1987-03-01), Tributsch
patent: 4675256 (1987-06-01), Winchester et al.
patent: 4676970 (1987-06-01), Todd et al.
Morimoto et al., Pyrrhotites: Stoichiometric compositions with composition en-1 Sn (N.gtoreq.8) Science, vol. 168, pp. 394-396, May 1970.

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