Crude Lead

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 It might be outdated or ideologically biased.

Lead, Crude

 

lead with an admixture of other metals; obtained from smelting lead ores or ore agglomerates. The percentage of impurities in crude lead is 2-3 percent, rarely up to 10 percent. Usually copper and antimony are present in crude lead; less frequently, arsenic, tin, and bismuth; and sometimes zinc, nickel, and cobalt in small quantities. In addition to these, crude lead contains sulfides of lead, iron, and copper. Silver is almost always present; gold is often present. Crude lead is refined to obtain pure lead.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
The topics include the effect of velocity on the dispersion of pollutants in a hypothetical Arctic open-pit mine, an inventory of highly resolved temporal and spatial volatile organic compound emissions in China, the quality of the work environment at the shaft furnace of a crude lead tapping and refining facility, diffusive sampling of air pollutants in US basins with oil and gas development, and household air pollution in South African low-income settlements: a case study.
They recall some of those crude lead figures supposedly forged in Sardinia or England.
Crude lead (lead bullion), containing 0.02% or more silver and intended for refining, classed under CN Code 7801 99 10, is exempt from charges on the condition that the criteria for its final use are put together.
The lead Isasmelt process is a continuous two-stage process for the production of crude lead from concentrate.