Methods and systems for utilizing carbide lime or slag
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.
- Research Organization:
- National Energy Technology Laboratory, Pittsburgh, PA, and Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- FE0002472
- Assignee:
- CALERA CORPORATION (Moss Landing, CA)
- Patent Number(s):
- 9,902,652
- OSTI ID:
- 1423456
- Country of Publication:
- United States
- Language:
- English
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