Use of ferrous sulfide for the removal of selenium from gases
AssigneeRedox Technology Group, LLC
InventorsGary J. Meyer, Thomas P. McCullough, Anthony J. Kriech
Life of this patent
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Abstract
A liquid suspension comprised of ferrous sulfide particles and method of using the same for the removal of selenium from industrial gas. Said liquid suspension may be (1) directly injected, or (2) coated onto or into a substrate and then injected into an industrial gas containing selenium to remove said selenium from the industrial gas stream in a dry scrubber system. Said liquid suspension of ferrous sulfide particles may also be used to remove selenium contained in industrial gases in a wet scrubber system.
Claims20
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.
In a method of using a wet gas scrubber to remove selenium from an industrial gas, said wet gas scrubber having a scrubber liquor and being configured for receiving and scrubbing said industrial gas with the scrubbing liquor, the improvement comprising providing as said scrubber liquor an alkaline liquid suspension of ferrous sulfide particles which removes selenium from the industrial gas 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.
Dependencies are inferred from the claim text.