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. 02, 2020
Filed:
Mar. 17, 2017
Applicant:
University of North Dakota, Grand Forks, ND (US);
Inventors:
Daniel Laudal, Grand Forks, ND (US);
Steven Benson, Grand Forks, ND (US);
Assignee:
University of North Dakota, Grand Forks, ND (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C22B 59/00 (2006.01); C22B 60/02 (2006.01); C22B 3/08 (2006.01); C22B 3/12 (2006.01);
U.S. Cl.
CPC ...
C22B 59/00 (2013.01); C22B 3/08 (2013.01); C22B 3/12 (2013.01); C22B 60/0234 (2013.01); C22B 60/0291 (2013.01); Y02P 10/234 (2015.11);
Abstract
A method includes contacting a coal feedstock with an acidic solution to form residual coal and a leachate. The method further includes separating the residual coal from the leachate where the leachate contains rare earth elements and where the residual coal has preserved organic content and reduced inorganic content. Another method includes contacting a coal feedstock with a basic solution to form residual coal and a leachate. The method further includes separating the residual coal from the leachate where the leachate contains rare earth elements.