Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,abbreviated as C4A3S)was synthesized by sintering at1375°C for2h with analytically pure carbonate calcium,alumina and dihydrate calcium sulfate.The crystal stru...Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,abbreviated as C4A3S)was synthesized by sintering at1375°C for2h with analytically pure carbonate calcium,alumina and dihydrate calcium sulfate.The crystal structure of C4A3S was characterized by XRD,SEM and TEM.Alumina leaching properties in Na2CO3solution were studied,and the leaching mechanism was investigated by means of Raman spectrum and XRD.The results show that C4A3S has porous morphology.The polycrystallines and single crystals coexist in C4A3S and grow along different directions.The alumina leaching rate of C4A3S is98.41%,which is higher than that of12CaO·7Al2O3under the optimal condition.The aluminum and sulfur elements exist in the leaching solution in the form of Al(OH)4and24SO,respectively,and the calcium exists as CaCO3in the leaching residues.展开更多
基金Project (E2016208107) supported by the Natural Science Foundation of Hebei Province,ChinaProjects (QN2015002,BJ2016023) supported by the Science and Technology Foundation of Higher Education Institution of Hebei Province,China
文摘Calcium sulphoaluminate(3CaO·3Al2O3·CaSO4,abbreviated as C4A3S)was synthesized by sintering at1375°C for2h with analytically pure carbonate calcium,alumina and dihydrate calcium sulfate.The crystal structure of C4A3S was characterized by XRD,SEM and TEM.Alumina leaching properties in Na2CO3solution were studied,and the leaching mechanism was investigated by means of Raman spectrum and XRD.The results show that C4A3S has porous morphology.The polycrystallines and single crystals coexist in C4A3S and grow along different directions.The alumina leaching rate of C4A3S is98.41%,which is higher than that of12CaO·7Al2O3under the optimal condition.The aluminum and sulfur elements exist in the leaching solution in the form of Al(OH)4and24SO,respectively,and the calcium exists as CaCO3in the leaching residues.
