Means for separating out noxious substances from gases and...

Details Means for separating out noxious substances from gases and... Means for separating out noxious substances from gases and...

B - Operations, Transporting

01

J

252/18, 23/341

B01J 20/04 (2006.01) B01D 53/34 (2006.01) B01D 53/64 (2006.01) B01D 53/72 (2006.01)

Patent

CA 2015974

A composition for separating out volatile pollutants from gases and exhaust gases comprising calcium hydroxide and water-soluble salts of sulfur-containing compounds, e.g., mercaptans, sulfides, polysulfides, polythionates and thiosulfates or elementary sulfur which are used in combination with surface- active substances. Possible ways to produce the composition include adding the sulfur-containing compounds to quicklime during slaking, to the slaking water or, subsequent to slaking, to calcium hydroxide. The compositions are used for removing the volatile heavy metals, particularly mercury, arsenic, cadmium, thallium, antimony and lead, at temperatures ranging from 0 ° C to 400 ° C. For this purpose, the composition is blown as powder into the exhaust gas stream, and the resultant products are separated out at fabric filters. Upon addition of surface-active substances, volatile organic pollutants are removed simultaneously with the afore-mentioned inorganic pollutants.

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