The lead-refining process is described as, "After copper drossing, generally Te, As, Sn and Sb are removed substantially by the Harris Refining Process using fused NaOH. A certain selectivity during refining is achieved by controlled addition of NaNO3. Another refining step is decopperizing by means of elemental sulfur.

Lead Refining Technology. Gravita's Refining Plant uses pyrometallurgical process for Lead Refining, producing Lead with a minimum purity level of 99.97% from Smelting furnaces tapped crude Lead.

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LEAD INDUSTRY PROFILE LEAD PRODUCTION About 60% of lead produced world-wide is derived from ore. ... between 70,000 and 90,000 people are employed in lead mining, smelting and refining, and over 2,000 more in lead oxide manufacture. ... plants, from below. The reaction is .

Lead Refining Plant:(Pyrometallurgical techniques) The Lead Bullion is fed into a refining kettle. Lead bullion contains many other metallic impurities including antimony, arsenic, copper, tin and zinc.