This article reports on the study to evaluate the potential possibility of regulating the tricalcium aluminate (C3A) hydration process by the addition of calcium sulfite hemihydrate. The kind and the form of hydration products were studied in the system: C3A–CaSO3·0.5H2O–H2O and C3A–CaSO3·0...detailed
Massive quantities of sulfite-rich flue gas desulfurization (FGD) scrubber sludge have been generated by coal burning power plants. Utilization of the sulfite-rich sludge for preparing α-calcium sulfate hemihydrate (α-HH), an important kind of cementitious material, is of particular interest t...detailed
The disposal of sulfite-rich flue gas desulfurization (FGD) scrubber sludge has been a tough problem. The sludge now finds its prospective utilization way by being transformed into α-calcium sulfate hemihydrate (α-HH). At low pH, atmospheric pressure and 95.0 °C, the calcium sulfite hemihydra...detailed
Calcium sulfite waste was successfully transformed to hydroxyapatite (HAp) by oxidation using H2O2, followed by reaction with (NH4)2HPO4 under an NH4OH atmosphere. A single phase hydroxyapatite was obtained by stirring at 60, 80, or 100 °C rather than by hydrothermal treatment at 150 °C. Such ...detailed