US 4,363,657 AGranted

Process for obtaining manganese- and silicon-based alloys by silico-thermal means in a ladle

AssigneeSociete Francaise d'Electrometallurgie Sofrem

InventorsLouis Boscaro, Michel Demange, Jean-Philippe Bucher, Francis Dubrous, Louis Septier

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Abstract

The invention relates to a process for obtaining manganese- and silicon-based alloys by silico-thermal means in a ladle. An oxidized liquid slag, usually originating from earlier metallurgical operations and still containing from 10 to 40% of manganese in the form of MnO is treated by a silicon-based reducing alloy (silicon content of at least 60% and preferably at least 70%) with agitation. A slag which is substantially exhausted of manganese and a metal containing more than 60% and generally more than 70% of manganese and from 5 to 40% and preferably from 10 to 35% of silicon are thus obtained.

Claims16

Dependent claims

A process for obtaining a manganese-based alloy by silico-thermia in a ladle from a heated oxidized slag containing manganese oxide comprising:

(a) introducing the heated oxidized slag, containing from 10 to 40% manganese oxide with the manganese being present essentially in the divalent state, into the ladle;
(b) introducing a crushed solid silicon-based reducing alloy, containing more than 60% silicon, into the ladle;
(c) contacting the heated oxidized slag and the silicon-based reducing alloy with agitation to exothermically reduce the oxidized slag without the further application of heat from an external source;
(d) separating a slag which is substantially free of manganese from a metal having a manganese content of at least 60% and a silicon content within the range of 5 and 40% by decantation.

1 more element

Dependencies are inferred from the claim text.