Refining process for removing antimony from lead bullion

Details Refining process for removing antimony from lead bullion Refining process for removing antimony from lead bullion

C - Chemistry, Metallurgy

22

B

53/338

C22B 13/06 (2006.01)

Patent

CA 1222872

ABSTRACT OF THE DISCLOSURE "An Improved Refining Process for Removing Antimony from Lead Bullion" An improved process for refining lead bullion containing antimony, in which the bullion is initially heated in a refining vessel to about 25°F (14°C) above the bullion melting point, and is thereafter kept molten primarily by exothermic process reactions. The process includes the steps of melting the lead-antimony bullion, agitating the bullion, adding caustic soda and metallic sodium to form an antimony-rich skimmable refining dross comprising a sodium-antimony inter- metallic and separating the dross from the refined bullion. Along with the antimony, other elements, such as arsenic, cadmium, copper, nickel, silver, sulfur, selenium, tellurium and zinc, if present in the bullion, are also removed in the dross by the sodium. The antimony-rich dross is accumulated for subsequent use. The process further comprises a cleansing operation wherein sodium present in solution in the refined bullion is removed using cleansing agents. This refining process is performed at a temperature between 600°F (316°C) and 800°F (427°C). Through thecontrol of temperature, reagent addition and agitation, the process provides an environmentally nonpolluting and controlled process in which economies of materials, energy, time and labor are realized over conventional refining processes.

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