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:
Dec. 30, 1980
Filed:
Jun. 21, 1979
Simo A Makipirtti, Nakkila, FI;
Outokumpu Oy, Outokumpu, FI;
Abstract
A process for the selective removal of the impurities, arsenic, antimony, selenium, tellurium and bismuth, present in sulfidic complex or mixed ores and concentrates or industrial precipitates containing similar minerals, by breaking up and rearranging, at an elevated temperature of 600.degree.-900.degree. C. and a high partial pressure of at least 0.2 atm of elemental sulfur, the minerals present in the raw material, in order to cause the formed new impurity compounds to pass into the gas phase, wherein the rearranging is carried out in a gas atmosphere which, in addition to sulfur, contains a sulfur halide in order to halogenate the impurity compounds which have passed into the gas phase, to form stable halides which no longer affect the vaporization equilibrium.