白云石质磷尾矿制备镁钙质耐火材料的热力学分析
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摘要
本文利用HSC Chemistry软件对白云石质磷尾矿制备镁钙质耐火材料进行了热力学分析,结果表明,在煅烧过程中,除白云石的分解为吸热反应外,其他反应均为放热反应。CaO的标准摩尔Gibbs自由能为-634.920kJ/mol,MgO的标准摩尔Gibbs自由能为-601.600kJ/mol,CaO比MgO更易与其他杂质发生反应,生成相应的化合物。高温下含有Ca的氧化物形成液相,这使得耐火材料在煅烧过程中更加致密。该方法为制备耐火材料提供了一定的理论依据。
The thermodynamic analysis for the preparation of magnesium-calcium refractory from dolomite phosphate tailings was made by using HSC chemistry software.The results show that in the calcining process,all the reactions are exothermic except the decomposition of dolomite into endothermic reaction.The standard molar Gibbs free energy of CaO is-634.920 kJ/mol,and the standard molar Gibbs free energy of MgO is-601.600 kJ/mol.CaO is more likely to react with other impurities than MgO to form the corresponding compound.At high temperatures,the oxides of Ca form a liquid phase,which makes the refractory denser in the calcining process.This method provides a certain theoretical basis for the preparation of refractory materials.
The thermodynamic analysis for the preparation of magnesium-calcium refractory from dolomite phosphate tailings was made by using HSC chemistry software.The results show that in the calcining process,all the reactions are exothermic except the decomposition of dolomite into endothermic reaction.The standard molar Gibbs free energy of CaO is-634.920 kJ/mol,and the standard molar Gibbs free energy of MgO is-601.600 kJ/mol.CaO is more likely to react with other impurities than MgO to form the corresponding compound.At high temperatures,the oxides of Ca form a liquid phase,which makes the refractory denser in the calcining process.This method provides a certain theoretical basis for the preparation of refractory materials.
引文
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[8]钱跃进,蒋明学,李柳生.从热力学计算分析气氛对高铬耐火材料烧结的影响[J].硅酸盐学报,2009,37(9):1 526-1 530.
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[11]蒯超.白云石制品的优化制备工艺及性能研究[D].武汉:武汉科技大学,2013.
[2]金绍祥,杨涛.贵州瓮福地区磷尾矿中钙、镁、磷的赋存状态测定[J].理化检验(化学分册),2012(5):590-593.
[3]李艳峰,方明山.贵州瓮福磷尾矿工艺矿物学研究[J].有色金属(选矿部分),2013(4):1-4.
[4]张伟,代佳雨.磷尾矿综合利用现状及展望[J].化工矿物与加工,2015,44(9):52-55.
[5]田兴.反浮选磷尾矿的综合利用[D].武汉:武汉工程大学,2013.
[6]何宾宾,张晖,方世祥,等.磷矿浮选尾矿的综合利用途径[J].磷肥与复肥,2015,30(8):28-30.
[7]马艳龙,尹洪峰,史绪波,等.镁钙材料表面包裹MgO膜过程的热力学分析及试验验证[J].耐火材料,2010,44(3):192-195.
[8]钱跃进,蒋明学,李柳生.从热力学计算分析气氛对高铬耐火材料烧结的影响[J].硅酸盐学报,2009,37(9):1 526-1 530.
[9]陈纪东,程列鑫,曾丽,等.铝铬耐火材料抗侵蚀的热力学模拟[J].硅酸盐通报,2015,34(12):3 737-3 740.
[10]黄芳,刘世荣,王华,等.高镁磷尾矿的矿石结构与矿物组成[J].矿物学报,2010,30(1):130-135.
[11]蒯超.白云石制品的优化制备工艺及性能研究[D].武汉:武汉科技大学,2013.