Effect of MgO/Al2O3 on Crystallization Behavior of Molten Modified Slag in Preparation Process of Blast Furnace Slag Based Cotton
-
摘要: 为了探究MgO/Al2O3对高炉渣基矿渣棉制备过程中调质高炉熔渣析晶行为的影响，利用Factsage热力学软件模拟了不同MgO/Al2O3时调质高炉熔渣降温过程中的理论析晶温度和析晶种类及含量，在实验室条件下以化学纯试剂模拟制备不同MgO/Al2O3高炉熔渣，利用XRD和SEM定性分析了不同MgO/Al2O3调质高炉熔渣的析晶行为。结果表明：不同MgO/Al2O3调质高炉熔渣均出现析晶现象，析出相主要是钙镁黄长石（2CaO·MgO·2SiO2）和钙铝黄长石（2CaO·Al2O3·SiO2），且析出相含量随MgO/Al2O3的变化呈规律性变化；不同析出相的开始析出温度和熔渣的固相开始析出温度随MgO/Al2O3值变化呈规律性变化，当MgO/Al2O3为0.6时，熔渣固相开始析出温度最低，为1 406.83℃，此时析晶活化能最大，此时体系最稳定。Abstract: In order to explore the effect of MgO/Al2O3 ratio on crystallization behavior of molten modified slag in the preparation progress of blast-furnace-slag-based slag fiber,theoretical crystallization temperature and species and contents of precipitated phases at different values of MgO/Al2O3 ratio in cooling process of modified slag were simulated by FactSage thermodynamic software.Ballast furnace slag with different values of MgO/Al2O3 ratio was prepared using chemical pure agents under laboratory conditions and crystallization behavior of molten modified slag with different values of MgO/Al2O3 ratio was analyzed by XRD and SEM.The results indicated that crystallization phenomenon occurred in modified slag with various MgO/Al2O3 ratio and the precipitated phases are mainly composed of akermanite(2CaO·MgO·2SiO2) and gehlenite(2CaO·Al2O3·SiO2).Theoretical crystallization temperatures of different precipitated phases and modified slag change regularly with the change of the value of MgO/Al2O3 ratio.When the value of MgO/Al2O3 ratio is 0.6,crystallization temperature of molten slag is the lowest at 1 406.83℃,at which activation energy of crystallization is at maximum value and the complete system is the most stable.
-
Key words:
- blast furnace slag /
- slag fiber /
- MgO/Al2O3 ratio /
- crystallization /
- Factsage
-
点击查看大图
计量
- 文章访问数: 17
- HTML全文浏览量: 5
- PDF下载量: 1
- 被引次数: 0
下载:
