Fuming


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Fuming

 

a method of recovering volatile components from fused slags containing zinc, lead, or tin. Slags containing lead and zinc are blasted with a coal and air mixture at 1200°–1250°C to reduce the oxides of lead and zinc; natural gas may be used in place of coal dust in the mixture. The metal vapors are removed with the gases and react with carbon dioxide to form oxidized sublimates; after being cooled in a waste-heat boiler, the sublimates are recovered in bag filters. The process is carried out in a rectangular shaft furnace equipped with 40–50 tuyeres. In order to obtain pure zinc oxide and to separate the lead oxides from it, the sublimates are roasted in a rotary furnace. When tin-bearing slags are fumed, the tin is removed as the volatile sulfide.

REFERENCE

Osnovy metallurgii, vol. 2. Moscow, 1962. Pages 415–21.

M. M. LAKERNIK

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