Record Display for the EPA National Library Catalog


Main Title Continuously Operating Direct Lead Smelting Process (QSL). Compendium on Low- and Non-Waste Technology. Addendum. Monograph.
CORP Author Economic Commission for Europe (UN), Geneva (Switzerland).;Environmental Protection Agency, Washington, DC.
Publisher 22 Feb 84
Year Published 1984
Stock Number PB95-237640
Additional Subjects Air pollution control ; Smelters ; Lead(Metal) ; Metal industry ; Lead smelting ; QSL process
Library Call Number Additional Info Location Last
NTIS  PB95-237640 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
The QSL Process has been developed to smelt lead sulphide concentrates as well as sulphate and mixed oxide-sulphate secondaries such as flue dusts, battery paste or lead-silver residues. As in conventional lead smelting, the gangue minerals contained in the raw materials are separated from the molten metal in the form of a fluid siliceous slag. Instead of two separate steps of sintering and blasting in a furnace, the QSL Process is a one-step process of continuous smelting of the charge, with the resulting pellets directly fed to the oxidation and reduction zones of the reactor. Sulphur dioxide gas emissions of about 15 to 25% by volume are utilized in the manufacture of sulfuric acid. Any sulphur contained in reduction coal or fuel is recovered, and the precipitated flue dust is directly recycled to the mixing section.