Process for the manufacture of ore pellets

Details Process for the manufacture of ore pellets Process for the manufacture of ore pellets

1975-08-27

1978-09-26

White, Robert F.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 3, 75 5, 264117, 264122, C21B 500

Patent

active

041166817

ABSTRACT:
Ore pellets of homogeneous composition and loose consistency, free of pellet germs and having a reduced content of adhesive, are formed by dry mixing ore powder of particle size less than 90 microns (preferably about 65% less than 40 microns), with a moisture content of less than 0.1%, and powdered adhesive, e.g. bentonite, 0.05 to 1 percent by volume preferably added over a period of at least 11/2 minutes; then adding to the dry mix 8 to 9% of water at 50.degree. to 90.degree. C., and then homogenizing by a plowing action by which the mass is torn and whipped apart without being allowed to perform a strong rolling action, preferably for only 50 to 90 seconds at a temperature of 60.degree. to 70.degree., rubbing under pressure also being avoided, after which the mixture is formed into pellets with addition of 0.4 to 0.5% of water during the forming process. The formed pellets may be roasted, baked or sintered.

REFERENCES:
patent: 2743172 (1956-04-01), DeVaney
patent: 3555133 (1971-01-01), Gentaz
Chem. Engr's. Handbook, by Perry et al., McGraw-Hill Book Co., New York, 1973, pp. 21-31 to 21-34.

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