水化石榴石向钙铁榴石碱热转变动力学  

Kinetics of Alkali-Thermal Transformation from Hydrogarnet to Hydroandradite

作　　者：杨再明 吴鸿飞 潘晓林 YANG Zaiming;WU Hongfei;PAN Xiaolin(Northeastern University Engineering and Research Institute Co.,Ltd.,Shenyang 110013,China;School of Metallurgy,Northeastern University,Shenyang 110819,China;Key Laboratory for Recycling of Nonferrous Metal Resources(Shenyang),Shenyang 110819,China)

机构地区：[1]东北大学设计研究院(有限公司),沈阳110013 [2]东北大学冶金学院,沈阳110819 [3]沈阳市有色金属资源循环利用重点实验室,沈阳110819

出　　处：《有色金属（冶炼部分）》2024年第2期35-40,共6页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(22078055,51774079);中央高校基本科研业务费专项资金资助项目(N2225002)。

摘　　要：基于高效脱硅产物钙铁榴石,从制备的水化石榴石中高效提取氧化铝,系统研究了不同参数对水化石榴石碱热转化的影响规律和反应动力学行为。结果表明,制备的水化石榴石主要由立方体颗粒团聚而成,化学组成与标准分子式基本一致。铁铝比的增加、反应温度的升高、反应时间的延长和分子比的增加均有利于水化石榴石中氧化铝的回收。水化石榴石最佳碱热转化工艺为:铁铝比1.0、反应温度280℃、反应时间60 min、分子比30,此条件下氧化铝回收率为63.12%。碱热转化过程中大部分水化石榴石转化为钙铁榴石,氧化铝的碱热反应主要受界面传输和扩散共同控制,反应表观活化能为26.60 kJ/mol。The alumina was efficiently extracted from prepared hydrogarnet through alkali-thermal transformation based on the efficient desilication product of hydroandradite.The effects of different parameters on alkali-thermal transformation of hydrogarnet and the reaction kinetics were systematically investigated.The results show that the prepared hydrogarnet is mainly formed by the aggregation of cubic particles,and its chemical composition is consistent with the standard molecular formula.The recovery efficiency of alumina increases by increasing the ratio of iron to alumina,enhancing the reaction temperature,prolonging the reaction time as well as increasing the molecular ratio.The recovery efficiency of alumina is 63.12% under the optimum conditions including the ratio of iron to alumina of 1,reaction temperature of 280℃,reaction time of 60 min,and molecular ratio of 30.Most of the hydrogarnet is converted to hydroandradite during alkali-thermal transformation.The reaction kinetics of alumina is controlled by interface transfer and diffusion across the product layer,and the apparent activation energy is 26.60 kJ/mol.

关 键 词：水化石榴石 钙铁榴石 转化规律 动力学 

分 类 号：TF821[冶金工程—有色金属冶金]