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:
Oct. 23, 1984
Filed:
Mar. 03, 1983
Applicant:
Inventors:
Albert Kruger, Redland, GB;
Richard Healey, Clevedon, GB;
Assignees:
Metallurgical Processes Limited, Nassau, BS;
I. S. C. Smelting Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01G / ; C22B / ;
U.S. Cl.
CPC ...
423 89 ; 423 99 ; 423100 ; 75-7 ;
Abstract
In the roasting (oxidation) of mixed zinc sulphide/lead sulphide concentrates, to give an oxidic product for reduction, improved sulphur elimination and reduced lead volatilization are achieved by mixing 2-20% by weight of zinc oxide with the mixed sulphide materials, forming pellets of 2-15 mm diameter and roasting these under controlled oxidation conditions, firstly at a lower temperature and then at a higher temperature; preferably at 850.degree.-950.degree. C. for the first stage and at 950.degree.-1050.degree. C. for the last stage.