Copper speiss as a co-additive in refining crude lead bullion

Details Copper speiss as a co-additive in refining crude lead bullion Copper speiss as a co-additive in refining crude lead bullion

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

051834960

ABSTRACT:
Previously formed copper speiss in an amount of about 6.5% by weight is a co-additive which extends the usefulness of sodium in refining crude lead bullion, which has a sulfur content generally less than about 1.3% by weight.

REFERENCES:
patent: 2110445 (1938-03-01), Lefferrer
patent: 2765328 (1956-10-01), Padgitt
patent: 4033761 (1977-07-01), Di 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, International Symposium on Injection in Process Metallurgy, Feb. 21, 1991.

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