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Yang Z.,Datang International High Alumina Coal R and nter | Sun J.,Datang International High Alumina Coal R and nter | Zhang Z.,Datang International High Alumina Coal R and nter | Ye J.,Key Laboratory of Cement Based Materials Science China Building Materials Academy | Miao R.,Datang International High Alumina Coal R and nter
Chinese Journal of Environmental Engineering | Year: 2014

To massively utilize the silicate-calcium slag, which is generated in process of aluminum extraction from fly ash, as cement mixture, in current study, effects of addition of crude and/or dealkalized silicate-calcium slag on the strength and stability of the cement were analyzed through cement strength assay, hydration heat release assay and dry shrinkage assay. Results showed that even when the amount of added silicate-calcium slag was up to 30%, the strength of the cement still met the criteria of P.C. 32.5. And as the slag addition increased, the heat release rate during the initial hydration increased, meanwhile the cumulative heat release and dry shrinkage significantly decreased. Compared with the crude silicate-calcium slag at the same addition amount, dealkalized silicate-calcium slag is more beneficial to maintaining the cement strength, lowering the hydration heat release and reducing the dry shrinkage. Source


Sun J.-M.,Datang International High Alumina Coal R and nter | Sun J.-M.,State Key Laboratory of Development and Utilization of High Alumina Coal | Wang C.-H.,Datang International High Alumina Coal R and nter | Wang C.-H.,State Key Laboratory of Development and Utilization of High Alumina Coal | And 9 more authors.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2014

The porous calcium silicate prepared from fly ash has characteristics of lower density (true density 1.1~1.3 g/cm3), higher bulk volume (bulk density 0.17~0.3 g/cm3), higher porosity (specific surface area 160~400 m2/g) and strong adsorption capacity. Research results showed that ash content of the paper increased from original 22.0% to 29.7% when the talc was used as the filler and the dosage of 5% of porous calcium silicate was added, indicating that porous calcium silicate was able to improve the retention of talc significantly. In addition, the study also showed that pore-effect, hydroxyl-effect and nano-effect of the porous calcium silicate appeared in papermaking system were the main reasons leading to significant adsorption and retention functions. Source


Sun J.,Datang International High Alumina Coal R and nter | Wu Z.,Datang International High Alumina Coal R and nter | Wu Z.,China University of Mining and Technology | Cheng H.,China University of Mining and Technology | And 3 more authors.
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

Raman spectroscopy was used to characterize and differentiate the two minerals calcite and dolomite and the bands related to the mineral structure. The (CO3)2- group is characterized by four prominent Raman vibrational modes: (a) the symmetric stretching, (b) the asymmetric deformation, (c) asymmetric stretching and (d) symmetric deformation. These vibrational modes of the calcite and dolomite were observed at 1440, 1088, 715 and 278 cm-1. The significant differences between the minerals calcite and dolomite are observed by Raman spectroscopy. Calcite shows the typical bands observed at 1361, 1047, 715 and 157 cm-1, and the special bands at 1393, 1098, 1069, 1019, 299, 258 and 176 cm-1 for dolomite are observed. The difference is explained on the basis of the structure variation of the two minerals. Calcite has a trigonal structure with two molecules per unit cell, and dolomite has a hexagonal structure. This is more likely to cause the splitting and distorting of the carbonate groups. Another cause for the difference is the cation substituting for Mg in the dolomite mineral. © 2013 Elsevier B.V. All rights reserved. Source

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