Method of producing silicon containing cast iron
AssigneesHarold Huston, Ronald Beyerstedt
InventorJohn D. Coyle
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Abstract
A method of producing cast iron including the steps of providing an initial cupola charge having a silicon content less than the silicon content required, melting the charge, conducting the melt to a mixing vessel, substantially increasing the silicon content of the melt by adding granular silicon carbide to the mixing vessel while simultaneously agitating the melt to achieve a good mix and conducting the silicon-enriched melt to a holding vessel or a molding line.
Claims12
A method of producing cast iron in a cupola comprising the steps of:
- (a) providing an initial cupola charge having a silicon content significantly less than the silicon content required in the melt,
- (b) loading and melting the charge in a cupola,
- (c) conducting the molten metal to a mixing vessel,
- (d) increasing the silicon content by a substantially continuous addition of commercially pure granular silicon carbide to the mixing vessel while simultaneously agitating the molten metal by external means to an extent sufficient to bring the silicon into solution with the molten metal and
- (e) conducting the silicon-enriched molten metal away from the mixing vessel.
A method of producing cast iron in a cupola comprising the steps of:
- (a) charging a cupola with a charge having a total silicon content significantly less than the silicon content required in the molten metal,
- (b) melting the charge,
- (c) conducting the melt to a mixing vessel,
- (d) increasing the silicon content of the melt by at least about 0.50 percent by weight by a substantially continuous addition of commercially pure granular silicon carbide to the mixing vessel while simultaneously agitating the melt by introducing gas under pressure through the bottom of the mixing vessel to mix the silicon with the melt, and
- (e) conducting the silicon-enriched melt to a holding vessel.
A method of producing grey iron in a cupola which permits the use of low silicon metallics in the cupola charge and the elimination of silicon-containing additives from the cupola charge comprising the steps of:
- (a) providing an initial cupola charge including a substantial portion of silicon-poor metallics such that the total silicon content of the charge is significantly less than the silicon content required in the molten metal whereby the material cost of the initial cupola charge is reduced,
- (b) loading and melting the charge in a cupola,
- (c) conducting the molten metal to a mixing vessel,
- (d) increasing the silicon content of the molten metal by an addition of commercially pure granular silicon carbide in divided form to the mixing vessel while simultaneously agitating the melt by external means to an extent sufficient to bring the silicon into solution with the molten metal and
- (e) conducting the silicon-enriched melt away from the mixing vessel.
A method of producing grey iron in a cupola which permits the use of low silicon metallics in the cupola charge and the elimination of silicon containing additives from the cupola charge comprising the steps of:
- (a) providing an initial cupola charge including a substantial portion of silicon poor metallics such that the total silicon content of the charge is significantly less than the silicon content required in the molten metal,
- (b) loading and melting the charge in a cupola,
- (c) conducting the molten metal to a mixing vessel,
- (d) increasing the silicon content of the molten metal by a substantially continuous addition of a silicon containing material to the mixing vessel while simultaneously agitating the melt by external means to an extent sufficient to bring the silicon into solution with the molten metal and
- (e) conducting the silicon enriched melt away from the mixing vessel.
Dependencies are inferred from the claim text.