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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.


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


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In those instances when a firearms examination is to be done or anticipated, each chamber opening (e.g., the cylinder of a revolver) and each barrel opening should be covered with a small piece of tape (just large enough to cover the opening) before fuming with glue.
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