Alloys or metallic compositions – Silicon base alloy containing metal
Patent
1989-07-26
1991-03-26
Dean, R.
Alloys or metallic compositions
Silicon base alloy containing metal
75327, C22C 2800
Patent
active
050027336
ABSTRACT:
A method of making a silicon alloy, and preferably a ferrosilicon alloy, having a controlled calcium content and optionally rare earth constituents wherein the calcium and rare earth constituents are separately introduced into the ferrosilicon smelting furnace in briquette form. The calcium briquettes comprise a compressed and cured mixture of calcium carbonate, preferably in the form of pulverized limestone, a carbon source, such as carbon black, and a binder. The briquetted calcium carbonate dissociates as it is heated during its descent in the smelting furnace and transforms to calcium oxide. The resultant calcium oxide reacts with the carbon in the briquette in the high temperature smelting zone to yield calcium carbide which then reacts with silica to form calcium silicide which then enters into solution with the molten ferrosilicon alloy. Rare earth oxides are also briquetted in ore form with a binder and charged into the smelting furnace wherein they are reduced by the excess carbon in the furnace charge to provide elemental rare earth constituents of controlled composition in the ferrosilicon alloy.
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Breton Ernest J.
Leszcynski Jan R.
Merritt Michael A.
Staggers John O.
American Alloys, Inc.
Dean R.
Schumaker David W.
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