Method of producing a reduced metal, and traveling hearth furnace for producing same
AssigneeKawasaki Steel Corporation
InventorsYoshitaka Sawa, Tetsuya Yamamoto, Kanji Takeda, Hiroshi Itaya
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Abstract
Producing reduced metal by charging and stacking a raw material containing a metal-containing material and a solid reducing material on a horizontally moving hearth of a traveling hearth furnace, by disposing a solid reducing material layer on the hearth, forming concave portions at the solid reducing material surface, stacking the raw material on the surface of the solid reducing material layer, reducing raw material by at least once heating and melting the material on the hearth to separate metal and gangue and ash ingredients, and discharging metal from the hearth.
Claims15
A method of producing a reduced metal from a metal-containing material, by previously charging a solid reducing material on a moving hearth of a traveling hearth furnace with the solid reducing material covering the hearth surface, thereafter stacking separate stacks of reducible material on and in said reducing material, and heating resulting material during movement of the hearth in the furnace to obtain a reduced metal, wherein the method comprises forming a solid reducing material layer on the hearth, charging and stacking the resulting material on the solid reducing material layer, reducing the solid reducible material by heating, putting the material into separate bodies of molten reduced metal and molten slag by melting and then solidifying the reducible material.
A method of producing a reduced metal from a reducible metallic material on a hearth surface, which method comprises:
- forming a continuous layer of solid reducing material on said hearth surface,
- charging said reducible metallic material in the form of a continuous layer on said solid reducing material layer, said reducible metallic material being physically arranged in the form of generally spotwise separate depressions on the surface of said solid reducing material layer, in the form of islands separated from each other and composed of reduced metallic material,
- reducing said reducible material by heating above said hearth to produce a plurality of reduced cups or depressions,
- further heating said reduced metallic material to melt said islands to produce separate bodies of molten reduced metal and molten slag in said depressions, and
- solidifying said molten metal and said molten slag individually in said depressions.
Dependencies are inferred from the claim text.