Qinghai Institute of Salt Lake

Xining, China

Qinghai Institute of Salt Lake

Xining, China

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Wu C.,Qinghai Institute of Salt Lake | Wu C.,University of Chinese Academy of Sciences | Zhang H.,Qinghai Institute of Salt Lake | Zhang H.,University of Chinese Academy of Sciences | And 2 more authors.
Advances in Cement Research | Year: 2013

Effects of alumina-leached coal fly ash residue (ACFAR) on magnesium oxychloride (MOC) cement are comprehensively investigated. The results show that the addition of ACFAR delayed the setting time of MOC paste. The compressive strength, the flexural strength and the water resistance of MOC are improved by the incorporation of ACFAR. Furthermore, the improvement effects of ACFAR are compared with those of raw coal fly ash (RFA) on MOC cement. Scanning electron microscopy analysis of MOC cement reveals that ACFAR decreases the interspaces in MOC cement and facilitates the radial growth of 5Mg(OH)2.MgCl2.8H2O. X-ray diffraction analysis of MOC cement with ACFAR indicates that the addition of ACFAR promotes the production of magnesium silicate, which can improve the compactness of 5Mg(OH)2.MgCl2.8H2O and the water resistance of MOC cement.


Wu C.-Y.,Qinghai Institute of Salt Lake | Wu C.-Y.,University of Chinese Academy of Sciences | Yu H.-F.,Qinghai Institute of Salt Lake | Yu H.-F.,Nanjing University of Aeronautics and Astronautics | And 2 more authors.
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2012

Aluminum was leached out from coal fly ash by pressure acid-leaching method. The effects of coal fly ash size, sulfuric acid concentration, reaction time and reaction temperature on extraction efficiency of aluminum were investigated comprehensively. The phase and morphology of coal fly ash and solid residues after reaction were analyzed by XRD, SEM and IR. The optimal technological conditions for extracting aluminum from coal fly ash were eventually confirmed that coal fly ash with size of 74 μm and sulfuric acid with concentration of 50 are mixed in pressure reaction kettle to react for 4 h at 180°C. Under the optimal conditions, the extraction efficiency of aluminum can reach 82.4. © 2012 The Nonferrous Metals Society of China.


Wu C.,Qinghai Institute of Salt Lake | Wu C.,University of Chinese Academy of Sciences | Zhang H.,Qinghai Institute of Salt Lake | Zhang H.,University of Chinese Academy of Sciences | Yu H.,Nanjing University of Aeronautics and Astronautics
Applied Mechanics and Materials | Year: 2012

Effects of aluminum-leached coal fly ash residue on water-resistance, compression strength and efflorescence of MOC cement have been investigated. The results show that the compression strength of MOC cement curried for 28 days increases with the dosage of ACFAR. The water resistance of MOC cement can be improved obviously. This study has proved that aluminum-leached coal fly ash residue can be used as the filling material of MOC cement with high compression strength and good water-resistance. © (2012) Trans Tech Publications.

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