Formation process and chemistry of the mineral 3CA·BaSO 4 have been studied. Research results show that the formation types of 3CA·BaSO 4 have three kinds of chemistry reaction at least. CA, C 12 A 7 and CA ...Formation process and chemistry of the mineral 3CA·BaSO 4 have been studied. Research results show that the formation types of 3CA·BaSO 4 have three kinds of chemistry reaction at least. CA, C 12 A 7 and CA 2 are the intermediate calcium aluminate phase during the formation process of 3CA·BaSO 4. BA exists in the clinkered sample as the impurity.展开更多
The Co2O3-doping effect on the formation of 3CaO · 3A12O3· CaSO from CaCO3-A12O3-CaSO4, 2H20 mixtures was investigated by means of SO2 emission behavior, chemical analysis, X-ray diffraction, differential th...The Co2O3-doping effect on the formation of 3CaO · 3A12O3· CaSO from CaCO3-A12O3-CaSO4, 2H20 mixtures was investigated by means of SO2 emission behavior, chemical analysis, X-ray diffraction, differential thermal analysis and scanning electron microscopy. The experimental results show that CO2O3 addition increases the reactivity of the CaCO3-A12O3-CaSO4·2H2O system significantly, by reducing SO2 emissions in combustion andf-CaO contents in the clinkers, promoting the nucleation and growth of 3CaO·3A12O3-CaSO4, and intensifying the formation of 3CaO·3A12O3·CaSO4. Moreover, CO2O3 addition lowers the formation temperature of 3CaO·3A12O3·CaSO4 by 18 ℃, and similarly increases the thermal stability of it at a wider temperature range.展开更多
High-temperature experiments were carried out for the slag systems of“FeO”−SiO_(2)−CaO−Al_(2)O_(3)and“FeO”−SiO_(2)−CaO−MgO at 1200℃and p(O_(2))of 10^(−7)kPa.The equilibrated samples were quenched,and the phase co...High-temperature experiments were carried out for the slag systems of“FeO”−SiO_(2)−CaO−Al_(2)O_(3)and“FeO”−SiO_(2)−CaO−MgO at 1200℃and p(O_(2))of 10^(−7)kPa.The equilibrated samples were quenched,and the phase compositions were measured by electron probe microanalysis(EPMA).A series of pseudo-ternary and pseudo-binary phase diagrams are constructed to demonstrate their applications in copper smelting process and evaluation of the thermodynamic database.Spinel and tridymite are identified to be the major primary phases in the composition range related to the copper smelting slags.It is found that the operating window of the smelting slag is primarily determined by w_(Fe)/w_(SiO_(2))ratio in the slag.Both MgO and Al_(2)O_(3)in the slag reduce the operating window which requires extra fluxing agent to keep the slag to be fully liquid.Complex spinel solid solutions cause inaccurate predictions of the current thermodynamic database.展开更多
文摘Formation process and chemistry of the mineral 3CA·BaSO 4 have been studied. Research results show that the formation types of 3CA·BaSO 4 have three kinds of chemistry reaction at least. CA, C 12 A 7 and CA 2 are the intermediate calcium aluminate phase during the formation process of 3CA·BaSO 4. BA exists in the clinkered sample as the impurity.
基金Funded by the National Natural Science Foundation of China(No.50972116)
文摘The Co2O3-doping effect on the formation of 3CaO · 3A12O3· CaSO from CaCO3-A12O3-CaSO4, 2H20 mixtures was investigated by means of SO2 emission behavior, chemical analysis, X-ray diffraction, differential thermal analysis and scanning electron microscopy. The experimental results show that CO2O3 addition increases the reactivity of the CaCO3-A12O3-CaSO4·2H2O system significantly, by reducing SO2 emissions in combustion andf-CaO contents in the clinkers, promoting the nucleation and growth of 3CaO·3A12O3-CaSO4, and intensifying the formation of 3CaO·3A12O3·CaSO4. Moreover, CO2O3 addition lowers the formation temperature of 3CaO·3A12O3·CaSO4 by 18 ℃, and similarly increases the thermal stability of it at a wider temperature range.
文摘High-temperature experiments were carried out for the slag systems of“FeO”−SiO_(2)−CaO−Al_(2)O_(3)and“FeO”−SiO_(2)−CaO−MgO at 1200℃and p(O_(2))of 10^(−7)kPa.The equilibrated samples were quenched,and the phase compositions were measured by electron probe microanalysis(EPMA).A series of pseudo-ternary and pseudo-binary phase diagrams are constructed to demonstrate their applications in copper smelting process and evaluation of the thermodynamic database.Spinel and tridymite are identified to be the major primary phases in the composition range related to the copper smelting slags.It is found that the operating window of the smelting slag is primarily determined by w_(Fe)/w_(SiO_(2))ratio in the slag.Both MgO and Al_(2)O_(3)in the slag reduce the operating window which requires extra fluxing agent to keep the slag to be fully liquid.Complex spinel solid solutions cause inaccurate predictions of the current thermodynamic database.
