Lime-fly ash-sulfite compositions

Details Lime-fly ash-sulfite compositions Lime-fly ash-sulfite compositions

C - Chemistry, Metallurgy

04

B

261/45, 261/83

C04B 7/26 (2006.01) C04B 7/12 (2006.01)

Patent

CA 1056409

A B S T R A C T Waste sulfite sludges are treated and disposed of by incorporation in hardenable compositions useful as structural materials. Such sulfite sludges may result from double alkali treatment or lime or limestone scrub- bing of sulfur oxide-containing gases, such as combustion furnace stack gases, for desulfurization thereof. After dewatering, alkaline earth metal material and a pozzolanically active waste material are added to the sludge. The resultant hardenable compositions has a solids content of 30-90%, by weight, the solids comprising 0.25 - 70% alkaline earth metal hydroxide, 0.25 - 70% alkaline earth metal sulfite and pozzolanic material sufficient to provide pozzolanic activity equal to 10 - 88.5% fly ash.

229901

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