Fe_3O_4在铜闪速炉反应塔中的形成热力学  

Formation thermodynamic of Fe_3O_4 in reaction shaft of flash smelting furnace

作　　者：汪金良[1,2] 张传福[2] 张文海[3] 

机构地区：[1]江西理工大学冶金与化学工程学院,江西赣州341000 [2]中南大学冶金与环境学院,湖南长沙410083 [3]中国瑞林工程技术有限公司,江西南昌330002

出　　处：《中南大学学报（自然科学版）》2013年第12期4787-4792,共6页Journal of Central South University:Science and Technology

基　　金：国家科技支撑计划项目(2013BAB03B05);国家自然科学基金资助项目(50904027);江西省青年科学家(井冈之星)培养对象计划项目(20133BCB23018)

摘　　要：将闪速炉反应塔内部空间视为物料与反应气体不断达到局域平衡的体系,建立铜精矿在闪速炉反应塔内反应的热力学模型,并对Fe3O4在反应塔中的形成热力学进行研究。研究结果表明:随物料在反应塔中的下落,反应塔中的氧势呈先快后缓的下降趋势,其模型计算值与实测值吻合较好,说明模型能较好地反映铜精矿在反应塔内的热力学行为;对于一定成分的物料,反应塔中的温度和氧势对Fe3O4的形成具有显著影响;较低的温度和较高的氧势对Fe3O4的形成有利;反应塔上端较易形成Fe3O4,利于形成内壁挂渣,但下端应加强塔壁水冷保护。A thermodynamic model of the copper concentrate reaction in the flash smelting furnace reaction shaft was proposed by treating the shaft interior space as a system where the concentrate and oxygen-rich air achieve local equilibrium continuously while falling to the settler, and then the model was used to analyze the formation thermodynamic of Fe3O4 in the reaction shaft. The results show that the oxygen potential lgpo2 tends to go down fast first and then slow with the fall of the concentrate in the reaction shaft, and the model calculated lgpo2 is in good agreement with the measured data, showing that the model can wholly embody the thermodynamic behavior of the copper concentrate in the reaction shaft. For the copper concentrate with a certain composition, the temperature T and lgpo2 have a significant impact on the Fe3O4 formation, and lower T but higher lgpo2 are efficient to form Fe3O4 in reaction shaft. It＇s easier to get Fe3O4 and to form frozen slag for the upper part of the shaft than the under part where the shaft wall should be protected more strongly by cooling water.

关 键 词：铜闪速熔炼 反应塔 FE3O4 热力学 挂渣 

分 类 号：TF801[冶金工程—有色金属冶金]