Abstract
A pyrometallurgical process for the recovery of metallic lead from lead chloride has been studied. The process consisted of smelting lead chloride with sodium carbonate and carbon so that the following reaction occurred in the liquid state:PbCl2(1) + Na2CO3(1) + 2C(s) = Pb(l) + 2NaCl(l) + 3CO(g).At smelting temperatures of over 801°C, the reaction products were molten metallic lead and molten sodium chloride. The effects of the following variables on lead recovery were investigated: smelting temperature, smelting time, and carbon and sodium carbonate additions. Also, it is shown that other pure alkali carbonates, alkali hydoxides, or their mixtures can be used. The smelting temperature can be reduced when mixtures are employed. In this process, the lead which is produced can be used as a low temperature getter to recover silver from silver chloride. In addition, a low temperature smelt-leach process for the recovery of lead oxide from lead chloride is described.
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