Method of producing cement
AssigneeLectromelt Corporation
InventorsHoward F. Davis, Jr., John A. Persson
Life of this patent
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Abstract
Tricalcium silicate materials useful in the production of Portland and other cements are prepared by melting a mixture of materials comprising basically line and silica in an electric furnace. The voltage between the electrodes and the conductivity of the melt are controlled so that a predetermined separation will be maintained between the lower end of the carbon electrode and the melt.
Claims8
A method of producing Portland cement composition melts in an electric arc furnace including the steps of:
- charging a mixture of first material containing calcium oxide and a second material containing silicon dioxide into an electric arc furnace having at least two carbon electrodes, energizing the electrodes to maintain a temperature in the furnace of about 3200.degree. F., feeding said materials into the furnace at such a rate that the conductivity thereof remains about 175 mho per meter, and maintaining a ratio of the electrode voltage to current at a level that ensures that the electrode will remain in close proximity to, but out of contact with the molten furnace bath.
A method of producing tricalcium silicate in an electric arc furnace including the steps of charging a mixture of calcium sulfate containing material and a silicon dioxide containing material into an electric arc furnace having at least one electrode, energizing the electrode to maintain a temperature in the furnace of about 2900.degree. -3200.degree. F., recovering SO.sub.3 gas generated from the melted materials and recovering material which is principally tricalcium silicate from the melt.
Dependencies are inferred from the claim text.