High-temperature experiments were carried out for the slag systems of“FeO”−SiO2−CaO−Al2O3and“FeO”−SiO2−CaO−MgO at 1200℃and p(O2)of 10−7kPa.The equilibrated samples were quenched,and the phase co...High-temperature experiments were carried out for the slag systems of“FeO”−SiO2−CaO−Al2O3and“FeO”−SiO2−CaO−MgO at 1200℃and p(O2)of 10−7kPa.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 wFe/w_(SiO2)ratio in the slag.Both MgO and Al2O3in 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
A simplified CaO-V2O5-MnO2 system was established to qualitatively and quantitatively investigate the transformation behavior of vanadates.The results demonstrated dynamic transformations between calcium vana...A simplified CaO-V2O5-MnO2 system was established to qualitatively and quantitatively investigate the transformation behavior of vanadates.The results demonstrated dynamic transformations between calcium vanadate and manganese vanadate as n(CaO)(V2O5)(MnO2)ratios and roasting temperatures varied.When MnO2 was incrementally added with n(CaO)(V2O5)of 2,some Ca2V2O7 converted to Mn2V2O7.The mass of vanadium as calcium vanadate consistently exceeded that as manganese vanadate.Conversely,when CaO was gradually added with n(MnO2)(V2O5)of 2,Mn2V2O7 tended to transform into Ca2V2O7 and Ca3V2O8.The affinity of vanadium for calcium was higher compared that of vanadium for manganese.The specific type of calcium vanadate formed depended on both n(CaO)(V2O5)(MnO2)values and roasting temperatures,while manganese vanadate remained predominantly as Mn2V2O7.The influence of roasting temperature on the conversion between calcium vanadate and manganese vanadate was minimal.At n(CaO)(V2O5)(MnO2)of 2/1/2 and temperatures ranging from 650 to 850°C,the mass ratio of vanadium present as calcium vanadate to manganese vanadate stabilized at approximately 2.展开更多
摘要High-temperature experiments were carried out for the slag systems of“FeO”−SiO2−CaO−Al2O3and“FeO”−SiO2−CaO−MgO at 1200℃and p(O2)of 10−7kPa.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 wFe/w_(SiO2)ratio in the slag.Both MgO and Al2O3in 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.
基金finally supported by the National Natural Science Foundation of China (Nos.52204309,52174277,52374300)。
摘要A simplified CaO-V2O5-MnO2 system was established to qualitatively and quantitatively investigate the transformation behavior of vanadates.The results demonstrated dynamic transformations between calcium vanadate and manganese vanadate as n(CaO)(V2O5)(MnO2)ratios and roasting temperatures varied.When MnO2 was incrementally added with n(CaO)(V2O5)of 2,some Ca2V2O7 converted to Mn2V2O7.The mass of vanadium as calcium vanadate consistently exceeded that as manganese vanadate.Conversely,when CaO was gradually added with n(MnO2)(V2O5)of 2,Mn2V2O7 tended to transform into Ca2V2O7 and Ca3V2O8.The affinity of vanadium for calcium was higher compared that of vanadium for manganese.The specific type of calcium vanadate formed depended on both n(CaO)(V2O5)(MnO2)values and roasting temperatures,while manganese vanadate remained predominantly as Mn2V2O7.The influence of roasting temperature on the conversion between calcium vanadate and manganese vanadate was minimal.At n(CaO)(V2O5)(MnO2)of 2/1/2 and temperatures ranging from 650 to 850°C,the mass ratio of vanadium present as calcium vanadate to manganese vanadate stabilized at approximately 2.