High temperature softening of lead bullion

Details High temperature softening of lead bullion High temperature softening of lead bullion

C - Chemistry, Metallurgy

22

B

53/337

C22B 13/10 (2006.01) C22B 13/06 (2006.01) C22B 15/00 (2006.01)

Patent

CA 1225242

- 22 - ABSTRACT OF THE DISCLOSURE: A process for the refining of lead bullion containing lead and copper, plus one or more of the elements sulphur, arsenic, antimony, tin, silver, bismuth and other elements known to be contained in lead bullion is disclosed. The process comprises first desulphurizing and softening the lead bullion in a furnace at a temperature sufficiently high to prevent the formation of a separate copper contain- ing phase, and then cooling of the softened bullion in a kettle or furnace to a temperature near 330 C to form a dross or matte containing substantially all the copper originally contained in the bullion.

465820

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