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Calcium silicate hydrate (CSH) from Egyptian heap fired rice straw ash (RSA). Preparation, characterization & some application

Alam El-Deen M.Bastawisy, Raafat M.Issa, Morsi M.Abou-Sekkina, Wael A.El-Helece

Some Calcium silicate hydrates (CSH) were obtained by the reaction of calcium hydroxide and silicic acid prepared from silica present in the ash remained after heap burning rice straw. Either pure CSH orCSH with carbon and other compounds present in the ash and insoluble in sodium hydroxide solution can be prepared by this technique. The obtained calcium silicate hydrates were characterized by IR and XRD analysis; some heavy metals present in waste water and underground water were efficiently removed by them.