Limestone-based sorbent agglomerates for removal of sulfur...

Details Limestone-based sorbent agglomerates for removal of sulfur... Limestone-based sorbent agglomerates for removal of sulfur...

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B01J 20/02 (2006.01) B01D 53/50 (2006.01) B01D 53/52 (2006.01) B01J 20/04 (2006.01) C10B 47/24 (2006.01) C10B 57/06 (2006.01)

Patent

CA 1151632

ABSTRACT OF THE DISCLOSURE Sulfur-containing compounds such as hydrogen sulfide and sulfur oxides arising from gasification or combustion of organic fuels such as coal may be removed from the hot gases by attrition resistant, highly reactive limestone-based sorbent agglomerates. The agglomerates are formed by crushing and powdering naturally occurring limestone into grains with a binder that is stable at high temperature, for example a colloi- dal grade of attapulgite clay. Volatile liquid is added to the mix of binder and powdered limestone to form a paste-like mix- ture, which is then agglomerated in compression-type agglomerat- ing equipment to form spheroidal agglomerates having good green strength. In fluidized bed combustion applications, these ag- glomerates have attrition resistance equivalent to conventional natural limestone granules and far more reactive in terms of sulfur pickup.

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