Production of low carbon chromium iron alloys from chromite concentrates
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United States of America Patent
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Oct 21, 2014
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Oct 21, 2013
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Abstract
A process for producing low carbon chromium iron alloys directly from chromite concentrates wherein superheated liquid aluminum is flowed in a controlled manner into a reaction vessel preheated to a temperature of approximately 1,000° C. while simultaneously feeding chromite concentrates preheated to a temperature in the same range at a controlled rate into the preheated reaction vessel. The ratio of chromite to aluminum is controlled to be at or above the stoichiometric ratio required to reduce the oxide from chromium and iron to low carbon ferrochrome alloy. Burnt lime is continuously added to the vessel in an amount sufficient to form and flux a slag of the eutectic composition known as calcium aluminate.
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