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.

Abstract: The invention concerns a method for eliminating bismuth from molten lead with magnesium and calcium, which consists in inputting magnesium and calcium in the form of lumps of two Mg—Ca alloys, one containing predominantly Mg, the other containing predominantly Ca, each having a Liquidus temperature lower than 650° C., and preferably less than 600° C. The Liquidus temperatures of the two alloys are preferably close to less than about 20° C. A particularly efficient treatment is obtained with a Mg—Ca alloy close to the eutectic alloy at 16.2 wt. % of calcium and containing 12 to 25% of calcium and a Ca—Mg alloy containing between 60 and 80% of calcium. The invention enables fast elimination of bismuth and adjustment of the Ca/Mg ratio during treatment.