摘要
焚烧垃圾底灰的主要氧化物组分为SiO2、CaO、Al2O3、Fe2O3、Na2O和MgO,该六元体系相关系和热力学性质对于焚烧底灰渣化处理中玻璃相形成以及重金属低浸出具有重要影响.本文运用计算热力学理论及相图计算方法,对CaO-SiO2-FeOx-MgO四元氧化物体系的热力学性质进行了研究,获得了描述该四元系液相吉布斯自由能的模型参数,并依此计算了不同温度及氧分压下SiO2-FeOx-MgO、CaO-SiO2-FeOx和CaO-SiO2-FeOx-MgO体系液相区和高铁区域的相关系.
The main oxide components of bottom ash are CaO, At2 03 , SiO2, F2O3, MgO, and Na2 O, and the thermodynamic properties of CaO - A12 03 - SiO2 - FeOx - MgO - Na20 six - component oxide system is of great scientific significance for formation of glass phase and low leaching of heavy metal. A study on the thermodynamic properties of the CaO - SiO2 - MgO - FeOx system was done by using CALPHAD method in this work. The modeling parameters to calculate the thermodynamic properties of the liquid phases in CaO - SiO2 - MgO - FeOx system were established, and the equilibrium phase relations and liquid zone of SiO2 - FeOX - MgO and CaO - SiO2 - FeOx - MgO systems were calculated at different temperatures and oxygen partial pressures. The results showed that the effects of temperature and oxygen partial pressure on the liquid zone and phase relation in the high FeOx field are remarkable.
出处
《材料与冶金学报》
CAS
北大核心
2012年第2期93-97,共5页
Journal of Materials and Metallurgy
基金
国家自然科学基金资助项目(50974034
51074039)
