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:
Jun. 21, 1983
Filed:
Oct. 24, 1980
Steag Aktiengesellschaft, Essen, DE;
Abstract
A dry method of removing pyrite from mineral coal in which the coal is mill-dried in a milling gas stream and the milled product is subjected to classification to recover a predominantly coal combustible fine fraction and a gravel or coarse fraction containing mining detritus, pyrite and coal. The gravel or coarse fraction, according to the invention, is subjected to density separation in whole or in part before being recycled to the milling stage and the density separation separates a light coal fraction from a heavy fraction containing the pyrite and detritus. This coal fraction can be returned to the miling stage while the heavy fraction can be subjected to further separation to recover the pyrite for other use or treatment.