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

C - Chemistry – Metallurgy – 22 – B

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C22B 13/06 (2006.01) C22B 9/10 (2006.01) C22B 13/08 (2006.01)

Patent

CA 2405733

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.

L'invention a pour objet un procédé de débismuthage du plomb par le magnésium et le calcium, dans lequel le magnésium et le calcium sont introduits sous forme de morceaux de deux alliages Mg-Ca, l'un à prédominance Mg, l'autre à prédominance Ca, présentant chacun une température de liquidus inférieure à 650 ~C, et de préférence à 600 C. Les températures de liquidus des deux alliages sont de préférence voisines à moins de 20 ~C près. On obtient un traitement particulièrement efficace avec un alliage Mg-Ca proche de l'eutectique à 16,2 % (en poids) de calcium et contenant de 12 à 25 % de calcium, et un alliage Ca-Mg contenant entre 60 et 80 % de calcium. L'invention permet un débismuthage rapide et un ajustement du rapport Ca/Mg au cours du traitement.

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