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:
May. 08, 1984
Filed:
Jun. 30, 1982
Paul Lazik, Cologne, DE;
Rheinische Braunkohlenwerke AG, Cologne, DE;
Abstract
In a process for separating sand from a brown coal or lignite material containing sand, wherein the sand is present entirely or predominantly in a grain size range covering only a part of the grain size range of the brown coal or lignite, with the grain size of the coarsest grains of the sand being markedly lower than the grain size of the coarsest coal grains, the coal in the grain size range between zero and at least the grain size corresponding to the maximum grain size of the sand is removed by a gaseous classifying operation, and the remaining material is subjected to a sieving or screening operation, the cut-off line of which is in the region of the grain size of the coarsest grains of the sand to be removed.