Metal melting method using electric arc furnace
OwnerSadamu Kinoshitainventor
Life of this patent
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Abstract
An electric arc furnace of the closed type for melting metals, having three heating electrodes and equipped with raw material charging inlets and a tapping hole in the furnace body. The three electrodes are arranged in a substantially straight line, and the raw material charging inlets are arranged in the furnace trunk or body so as to permit raw materials in chip form to be fed into the furnace in parallel with the line of the three electrodes. The raw material charging inlets also serve to exhaust dust and smoke produced in the course of operating the electric furnace.
Claims2
A method of melting and refining cast iron in an electric arc furnace of the closed type comprising the steps of:
- generating an electric arc in said furnace using suitable electrodes;
- charging raw materials into said furnace, said charging being accomplished so that said raw materials form heaps around said electrodes and cover said arc;
- maintaining a reductive atmosphere and a positive pressure in said furnace using gas generated within said furnace;
- melting said heaped raw materials so that fresh raw materials slide down, section by section, into said arc to be melted into drops of molten metal;
- forming a layer of slag from a basic material having a melting point higher than that of the molten metal;
- removing oxygen and sulfur from said molten metal by passing said drops of molten metal through said layer of slag;
- and
- continuously tapping said molten metal after passage through said layer of slag.
Dependencies are inferred from the claim text.