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:
Jan. 25, 1977
Filed:
May. 20, 1975
Applicant:
Inventors:
Stephen Peter Beaton, Amherstview, CA;
David Alan Harbourne, Kingston, CA;
Assignee:
Du Pont of Canada Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B / ;
U.S. Cl.
CPC ...
75 77 ; 423 95 ; 4235 / ; 423559 ;
Abstract
A process for the treatment of lead sulphide with an aqueous solution of sulphur dioxide at a temperature of at least 20.degree. C and in the absence of oxygen is disclosed. In a preferred embodiment the lead sulphate and/or lead sulphite so formed is heated with lead sulphide at a temperature of 700.degree. to 1200.degree. C in the absence of oxygen. Metallic lead is obtained. In the preferred embodiment the lead sulphide may contain zinc sulphide whereby both metallic lead and metallic zinc may be obtained.