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:
Aug. 12, 1997
Filed:
Sep. 29, 1994
Akita Zinc Col., Ltd., Tokyo, JP;
Abstract
Mercury in trace amounts in sulfur that has been recovered from zinc concentrates by direct pressure leaching or other hydrometallurgical processes can be removed effectively by bringing the molten sulfur, as it is held at a temperature not lower than the melting point of sulfur, into contact with activated alumina by passage through a packed layer of activated alumina or a filter coated with activated alumina, or by mixing with activated alumina under stirring or by passage through a fluidized layer of activated alumina. The method is capable of reducing the mercury content to 1 ppm or less, whereby sulfur having a purity of at least 99.99% that is advantageous for use as a raw material in the production of sulfuric acid and in other industries is manufactured at low cost on simple equipment.