氧化铝种分过程浓度及质量比模型的研究  

Concentration and mass ratio model of gibbsite precipitation process in alumina production

作　　者：张家元[1] 李永清[1,2] 付明辉[1] 刘斌[1] 李黎[1] 

机构地区：[1]中南大学能源科学与工程学院,湖南长沙410083 [2]湖南工业大学冶金工程学院,湖南株洲412007

出　　处：《中南大学学报（自然科学版）》2011年第6期1543-1548,共6页Journal of Central South University:Science and Technology

基　　金：中国博士后基金资助项目(291054)

摘　　要：从种分过程的动力学机理出发,结合实验室实验和生产现场的工业试验,以铝酸钠溶液分解过程的动力学方程为数学模型,利用Simulink软件包建立种分过程的浓度变化的动态模型对种分过程进行模拟,预测不同工艺条件下连续分解槽的氧化铝浓度变化。基于分解槽浓度变化直接影响铝酸钠溶液的分解率,利用模型来研究不同工艺制度下种分过程分解率的变化,同时建立连续分解槽的质量比(Rp)模型,通过Rp模型预测不同工艺条件下种分过程的分解率。研究结果表明:降低初温和降低末温有利于提高分解率;实际生产过程的温度是波动变化的,温度异相位波动比同相位波动对分解率影响更大,故可根据天气状况及时调整种分工艺条件,为分解工艺参数的调整和优化提供一定的参考依据。The kinetic mechanism,laboratory experiments and industrial tests of the gibbsite precipitation process were employed.On the basis of the dynamic model of decomposition of sodium aluminate solution,a combined dynamic model of Al2O3 concentration was developed with the simulink package to simulate the gibbsite precipitation process,and the Al2O3 concentration was predicted in continuous decomposer tank in different conditions.Because the change of Al2O3 concentration affects the decomposition rate of sodium aluminates solution directly,so the mode can be used to study the value ranges of decomposition rate in different conditions.The mass ratio（Rp） model of the continuous decomposition tank was established,and the decomposition rate of the gibbsite precipitation process in different conditions was predicted.The results show that if the beginning and end temperatures reduce,the decomposition rate will be improved.In practical process,the temperature is fluctuant,and compared with the same-phase fluctuation of the temperature,iso-phase fluctuation has greater impact on the decomposition rate.The technology conditions can be adjusted according to weather conditions to guide the production process and provide reference for the adjustment and optimization of the decomposition parameters.

关 键 词：氧化铝 种分过程 模型 浓度 分解率 

分 类 号：TF803.22[冶金工程—有色金属冶金]