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United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Provided herein are methods comprising a) treating a slag solid or carbide lime suspension with an ammonium salt in water to produce an aqueous solution comprising calcium salt, ammonium salt, and solids; b) contacting the aqueous solution with carbon dioxide from an industrial process under one or more precipitation conditions to produce a precipitation material comprising calcium carbonate and a supernatant aqueous solution wherein the precipitation material and the supernatant aqueous solution comprise residual ammonium salt; and c) removing and optionally recovering ammonia and/or ammonium salt using one or more steps of (i) recovering a gas exhaust stream comprising ammonia during the treating and/or the contacting step; (ii) recovering the residual ammonium salt from the supernatant aqueous solution; and (iii) removing and optionally recovering the residual ammonium salt from the precipitation material.
Devenney, Martin (Mountain View, CA), Fernandez, Miguel (San Jose, CA), Chen, Irvin (Santa Clara, CA), Calas, Guillaume (Mountain View, CA), Weiss, Michael Joseph (Los Gatos, CA), Tester, Chantel Cabrera (San Jose, CA)
14/ 694,348
April 23, 2015
GOVERNMENT SUPPORT [0002] Work described herein was made in whole or in part with Government support under Award Number: DE-FE0002472 awarded by the Department of Energy. The Government has certain rights in this invention.