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US 10,981,821 B2Granted
Environmentally sustainable cement composition, its use for inerting dredging sediments/sludges, relative method and apparatus for inerting
OwnerFabio Corazza, Sara Cepolina +4inventors
InventorsFabio Corazza, Sara Cepolina, Maurizio Di Dio, Gerardo Capannelli, Antonio Comite, Gustavo Capannelli
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Abstract
A cement composition based on a sulfoaluminate clinker is described, together with its use for agglomerating and inerting sediment/dredging sludge, and the relative inerting method and apparatus.
Claims8
A method for inerting sediment/dredging sludge, which comprises the following steps:
- sucking/removing sediment from a bottom of a water basin forming dredging sludge;
- feeding the dredging sludge to a mixing and sedimentation chamber;
- feeding a cement composition to the mixing and sedimentation chamber, the cement composition comprising a sulfoaluminate clinker in a percentage ranging from 75 to 97.9% by weight with respect to the weight of the cement, ferrous sulfate (FeSO4nH2O) in a percentage ranging from 2 to 20% by weight with respect to the weight of the cement, and an accelerating agent of a hydration reaction in a percentage ranging from 0.1 to 5% by weight with respect to the weight of the cement, said accelerating agent of the hydration reaction being selected from the group consisting of alkaline metal carbonate, sulfate, or nitrate salts;
- mixing of the dredging sludge with the cement composition for a time ranging from 10 seconds to 5 minutes;
- sedimentation of the mixture thus obtained for a time ranging from 2 to 120 minutes;
- solidification of the sediment thus obtained for a time ranging from 1 to 24 hours;
- the entire method being carried out underwater.
4 more elements
Dependencies are inferred from the claim text.