US 9,808,756 B2
Use of ferrous sulfide for the removal of selenium from gases
Gary J. Meyer, Indianapolis, IN (US); Thomas P. McCullough, Carmel, IN (US); and Anthony J. Kriech, Indianapolis, IN (US)
Assigned to Redox Technology Group, LLC, Indianapolis, IN (US)
Filed by Redox Technology Group LLC, Carmel, IN (US)
Filed on Aug. 26, 2016, as Appl. No. 15/248,537.
Claims priority of provisional application 62/213,082, filed on Sep. 1, 2015.
Claims priority of provisional application 62/233,842, filed on Sep. 28, 2015.
Prior Publication US 2017/0056818 A1, Mar. 2, 2017
Int. Cl. B01D 53/64 (2006.01); C01G 49/12 (2006.01); B01D 53/14 (2006.01); B01D 53/02 (2006.01); B01D 53/46 (2006.01); B01D 53/80 (2006.01)
CPC B01D 53/1493 (2013.01) [B01D 53/025 (2013.01); B01D 53/46 (2013.01); B01D 53/80 (2013.01); B01D 2252/10 (2013.01); B01D 2253/1128 (2013.01); B01D 2257/93 (2013.01)] 20 Claims
 
1. A method of removing selenium from an industrial gas containing selenium which method comprises the steps of:
providing an alkaline suspension of ferrous sulfide particles;
contacting said industrial gas containing selenium with an alkaline liquid suspension of ferrous sulfide particles;
contacting said industrial gas containing selenium with said alkaline liquid suspension of ferrous sulfide particles; and
allowing the industrial gas containing selenium to react with said alkaline liquid suspension of ferrous sulfide particles and be removed by at least one of:
i) adsorption onto said ferrous sulfide particles
ii) adsorption onto iron (hydr)-oxides or green rusts that form in said alkaline liquid suspension of ferrous sulfide particles; and
iii) absorption by reacting with sulfur formed in alkaline liquid suspension of ferrous sulfide particles and iron-selenium complexes or iron-selenium containing precipitates.