Direct Smelting of Lead Sulfide.
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The extraction of lead from lead sulfide by a direct-smelting process that is free of sulfur oxide emissions was investigated. The process involved reducing lead sulfide with carbon in the presence of limestone. Under the conditions employed, limestone dissociates readily into lime and carbon dioxide. The limestone is the active desulfurizing agent that fixes the sulfur in the charge by forming cas residue. The investigation focused on the measurement of reduction kinetics in the temperature range of 768 deg. to 1,026 deg. C. The reduction of pbs in the presence of lime using co-co2-n2 gas reductant was also studied. The kinetics of both the catalyzed and uncatalyzed reduction processes were investigated. The catalyst used is an equimolar ternary eutectic (k,na,li)2co3 that has a relatively low melting point of 397 deg. C.
CP; Final Contract Report;
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University of Washington