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Methods and systems for utilizing carbide lime or slag

United States Patent

February 27, 2018
View the Complete Patent 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 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.