Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1975-09-10
1976-08-17
Stallard, W.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 5BA, B22F 900, C21B 1500
Patent
active
039751864
ABSTRACT:
Iron oxide particles are made by spray calcination and the oxide is reduced at least substantially in CO at temperatures between 800.degree. and 1000.degree. C. The oxide is heat-treated prior to calcination or CaO is added to enhance formation of iron fibers. The reducing atmosphere may in parts include hydrogen or the last phase of reduction is carried out in hydrogen. The iron cake is cooled and broken up in a grinder. The resulting powder has low bulk density due to a fiber-like, non-porous consistency of its particles. Grinding may continue to increase bulk density.
REFERENCES:
patent: 2065618 (1936-12-01), Sherwood
patent: 2735757 (1956-02-01), Zapf
patent: 2818328 (1957-12-01), Francis
patent: 2867524 (1959-01-01), Chang
patent: 2927016 (1960-03-01), Francis
patent: 3044868 (1962-07-01), Francis
Dautzenberg Norbert
de Haas Hans
Grebe Klaus
Hewing Josef
Mannesmann Aktiengesellschaft
Siegemund Ralf H.
Stallard W.
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