Method for eliminating bismuth from molten lead by adding...

Details Method for eliminating bismuth from molten lead by adding... Method for eliminating bismuth from molten lead by adding...

2005-01-11

2005-01-11

Andrews, Melvyn (Department: 1742)

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

Reexamination Certificate

active

06840980

ABSTRACT:
A method for eliminating bismuth from molten lead with calcium and magnesium, in which the addition of calcium and magnesium is made in the form of lumps two Mg—Ca alloys, one containing predominantly Mg, the other containing predominantly Ca, each having a liquidus temperature lower than 650° C., and preferably lower than 600° C. A preferred treatment utilizes a first alloy containing 12-25% Ca, close to the eutectic alloy at 16.2% by weight Ca, and a second alloy containing 60-80% Ca. The method enables rapid elimination of bismuth, and adjustment of the Ca/Mg ratio during the treatment.

REFERENCES:
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patent: 343012 (1995-09-01), None
patent: 2514786 (1983-04-01), None
patent: 2764905 (1998-12-01), None
patent: 378469 (1973-04-01), None

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