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:
Feb. 24, 2004
Filed:
Oct. 02, 2000
Applicant:
Inventors:
Assignee:
Dowa Mining Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C01B 1/700 ; C01G 9/00 ; C22B 1/900 ;
U.S. Cl.
CPC ...
C01B 1/700 ; C01G 9/00 ; C22B 1/900 ;
Abstract
A sulfurous compound such as a sulfur-rich “float” (concentrate) obtained by flotation of the residue from the leaching of a zinc concentrate is heated at a temperature not lower than the melting point of sulfur but below its boiling point, preferably not higher than 200° C., more preferably not higher than 140° C., and the evolving gas containing sulfur vapor is cooled at a temperature less than the melting point of sulfur, preferably at ordinary temperature, to condense sulfur.