The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 27, 1977
Filed:
Jul. 14, 1976
Frank Lawson, Victoria, AU;
Glen Waverley, Victoria, AU;
Denby Harcourt Ward, Port Pirie, AU;
Robert George Kelly, Port Pirie, AU;
The Broken Hill Associated Smelters Proprietary Limited, Melbourne, AU;
Monash University, Melbourne, AU;
Abstract
A continuous sulphur drossing process for the decoppering of lead comprising the steps of flowing lead bullion into the first of a series of at least two reaction vessels; continuously agitating the lead bullion in the first reaction vessel, adding sulphur to the lead bullion during the continuing agitation; continuously and concurrently transferring the lead bullion, dross arising from the copper reacted with the sulphur, and any unreacted sulphur from each reaction vessel to the next in the series without backmixing; agitating the contents of each reaction vessel; maintaining the total residence time of the materials in the reaction vessels below that in which a significatn amount of reversion to elemental copper would occur, thereby substantially preventing re-solution of copper in he bullion; continuously and concurrently transferring decoppered bullion and dross from the final reaction vessel in the series to an unagitated dross separation vessel; removing the dross from the surface of the decoppered bullion in the dross separation vessel; and continuously withdrawing decoppered bullion from the dross separation vessel.