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RECORD NUMBER: 219 OF 1152

OLS Field Name OLS Field Data
Main Title Control of Sulfur Dioxide Emissions from Copper Smelters: Volume II. Hydrogen Sulfide Production from Copper Concentrates.
Author Rohrmann, C. A. ; Fullam., H. T. ;
CORP Author Battelle-Pacific Northwest Labs., Richland, Wash.;National Environmental Research Center, Research Triangle Park, N.C. Control Systems Lab.
Year Published 1974
Report Number EPA-68-02-0025; EPA/650/2-74-085-b;
Stock Number PB-237 928
Additional Subjects Smelting ; Sulfur dioxide ; Sulfur ; Hydrogen sulfide ; Iron oxides ; Roasting ; Leaching ; Pyrite ; Materials recovery ; Copper sulfides ; Cost analysis ; Hydrochloric acid ; Copper industry ; Air pollution control
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB-237 928 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 119p
Abstract
A laboratory investigation has been made of a modified copper smelting process which provides a solution to the sulfur dioxide air pollution problem. Preliminary economic evaluation of the process appears favorable with good prospects for further improvements when compared with conventional processes provided with equivalent air pollution abatement capabilities. The process would involve (1) neutral roasting of pyritic copper concentrates to convert the contained iron into an acid-soluble form with evolution of some elemental sulfur in this step, (2) hydrochloric acid leaching of the roasted concentrate to disolve the iron with simultaneous hydrogen sulfide generation and production of an enriched copper sulfide residue, (3) converting the copper sulfide residue to blister copper by conventional means, (4) reducing the sulfur dioxide formed in the converting step to elemental sulfur with hydrogen sulfide from the leaching step, and (5) processing the iron chloride leach solution to regenerate hydrochloric acid and to yield a marketable iron oxide.