Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1983-10-11
1985-02-05
Andrews, M. J.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
266214, 266240, 222604, 432157, C22B 1112
Patent
active
044976585
ABSTRACT:
A highly compact and efficient tilting crucible furnace and smelting method is disclosed for use in the direct smelting of a precious metal containing material. A furnace body having a refractory lined cavity which has a top opening is pivotally mounted on a support frame to allow tipping thereof. A cover having a first opening to receive a gas burner and a second multi-purpose opening therein is rigidly attached to the body. A gas burner attached to the cover provides a downwardly directed oxidizing flame into the cavity to oxidize iron which is added to the cavity and other impurities in the precious metal containing material. A flux is provided to provide a thoroughly liquid mixture and after heating, the molten mass is poured through the multi-purpose cover opening into a mold. As the mold cools, a dore button of precious metal settles to the bottom of the mold and slag containing impurities forms on the top.
REFERENCES:
patent: 486613 (1892-11-01), Langguth
patent: 792642 (1905-06-01), Williams
patent: 2828516 (1958-04-01), Black et al.
patent: 3372993 (1968-03-01), Brown
patent: 3970444 (1976-07-01), Brotzmann et al.
patent: 4404022 (1983-09-01), Godbehere
Andrews M. J.
Silverman Arnold B.
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