Iron and a copper speiss as co-additives in refining crude lead

Details Iron and a copper speiss as co-additives in refining crude lead Iron and a copper speiss as co-additives in refining crude lead

1992-02-13

1993-02-02

Andrews, Melvyn J.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

C22B 1306

Patent

active

051834979

ABSTRACT:
A process for using an iron-containing sulfide reagent and a previously formed copper speiss as joint co-additives to extend the usefulness of the sodium in refining crude bullion which has less than about 1.3 wt. % sulfur.

REFERENCES:
patent: 2110445 (1938-03-01), Lefferrer
patent: 2765328 (1956-10-01), Padgitt
patent: 4033761 (1977-07-01), De Martini et al.
patent: 4153451 (1979-05-01), Crasto et al.
patent: 4333763 (1982-06-01), Di Martini et al.
patent: 4404026 (1983-09-01), Di Martini et al.
patent: 5100466 (1992-03-01), Blenk
"Sodium Treatment of Copper Dross", C. Bates and C. Di Martini Journal of Metals, Aug. 1986, pp. 43-45.
"Process for Separating Impurities from Crude Lead Bullion Via Sodium Metal Injection", M. B. Blenk, R. B. Diemer and J. P. Hager, Internal Symposium on Injection in Process Metallurgy, Feb. 21, 1991.

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