The simulation of blast furnace slag was prepared by pure chemical reagents.Test methods like DSC,XRD and SEM were used to study the effect of Al2O3 and MgO content on crystallization of blast furnace slag during fibe...The simulation of blast furnace slag was prepared by pure chemical reagents.Test methods like DSC,XRD and SEM were used to study the effect of Al2O3 and MgO content on crystallization of blast furnace slag during fiber formation.The results show that as Al2O3 and MgO contents in the sample changed,blast furnace slag was crystallized at the average temperature below 1232 K.When the ratio of Mg/Al in the samples is 0.6 calculated by Kissinger equation,crystallization activation energy is at the maximum value and the system is in the most stable condition.The sample crystallization phases are mainly calcium akermanite(2CaO?MgO?2SiO2)and gehlenite(2CaO?Al2O3?SiO2).Secondary crystallization phases are anorthite(CaAl2Si2O8),wollastonite minerals(WOLLA)and pyroxene minerals(cPyrA).Meanwhile,the principal crystallization phases of the samples are different types and have different contents,and the microstructures of the sample sections are different due to the difference between MgO/Al2O3 ratio.展开更多
利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,...利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,调质熔渣黏度对温度变化的敏感性逐渐减弱,适宜成纤黏度范围对应的温度区间逐渐增大,适宜成纤黏度范围内最低成纤温度与析晶温度之差Δ t =( t w- t l)逐渐增大,当 M k为1.2时Δ t 为101.7 ℃;在调质熔渣适宜成纤温度范围内, M k 对熔渣表面张力的影响不大,熔渣表面张力与黏度的比值σ/η(表征熔渣成形难易程度)随 M k 的增大逐渐减小.展开更多
基金Project(51474090)supported by the National Natural Science Foundation of China
文摘The simulation of blast furnace slag was prepared by pure chemical reagents.Test methods like DSC,XRD and SEM were used to study the effect of Al2O3 and MgO content on crystallization of blast furnace slag during fiber formation.The results show that as Al2O3 and MgO contents in the sample changed,blast furnace slag was crystallized at the average temperature below 1232 K.When the ratio of Mg/Al in the samples is 0.6 calculated by Kissinger equation,crystallization activation energy is at the maximum value and the system is in the most stable condition.The sample crystallization phases are mainly calcium akermanite(2CaO?MgO?2SiO2)and gehlenite(2CaO?Al2O3?SiO2).Secondary crystallization phases are anorthite(CaAl2Si2O8),wollastonite minerals(WOLLA)and pyroxene minerals(cPyrA).Meanwhile,the principal crystallization phases of the samples are different types and have different contents,and the microstructures of the sample sections are different due to the difference between MgO/Al2O3 ratio.
文摘利用铁尾矿进行高炉渣调质实验,研究了酸度系数( M k )对调质高炉熔渣析晶性能、黏度及表面张力的影响.结果表明:随 M k 的增加,调质熔渣的析晶温度明显降低,当 M k 高于1.4时熔渣温度降至 1 100℃,体系仍为无序玻璃相;随 M k 的增大,调质熔渣黏度对温度变化的敏感性逐渐减弱,适宜成纤黏度范围对应的温度区间逐渐增大,适宜成纤黏度范围内最低成纤温度与析晶温度之差Δ t =( t w- t l)逐渐增大,当 M k为1.2时Δ t 为101.7 ℃;在调质熔渣适宜成纤温度范围内, M k 对熔渣表面张力的影响不大,熔渣表面张力与黏度的比值σ/η(表征熔渣成形难易程度)随 M k 的增大逐渐减小.
