Effects of electrolysis process parameters on alumina dissolution and their optimization  

电解工艺参数对氧化铝溶解的影响及优化

作　　者：Wen-yuan HOU He-song LI Mao LI Ben-jun CHENG Yuan FENG 侯文渊;李贺松;李茂;程本军;冯源(中南大学能源科学与工程学院,长沙410083)

机构地区：[1]School of Energy Science and Engineering,Central South University,Changsha 410083,China

出　　处：《Transactions of Nonferrous Metals Society of China》2020年第12期3390-3403,共14页中国有色金属学报（英文版）

基　　金：Project(2010AA065201)supported by the High Technology Research and Development Program of China;Project(2018zzts157)supported by the Fundamental Research Funds for the Central Universities of Central South University,China。

摘　　要：The Box–Behnken design and desirability approach were used to investigate and optimize the process parameters for aluminum reduction cells related to alumina dissolution. The bath temperature, alumina content, current and alumina temperature were chosen as the design parameters. The content of cumulative dissolved alumina(CCDA) and the relative deviation from the target content(RDTC) were adopted as the responses. The interactive influence results show that increasing the bath temperature and alumina temperature, as well as decreasing the alumina content, can increase CCDA. Increasing the bath temperature and lowering the current are beneficial for obtaining a more uniform alumina distribution. The optimal operating parameters were determined to be as follows: bath temperature of 958.8 ℃, alumina content of 2.679 wt.%, current of 300 kA and alumina temperature of 200 ℃.采用Box-Behnken设计和满意度函数法研究和优化与氧化铝溶解有关的铝电解工艺参数。选择电解质温度、氧化铝含量、电流和氧化铝温度作为影响参数,采用氧化铝累积溶解含量(CCDA)和相对偏离目标含量(RDTC)作为响应值。交互影响研究结果表明:增加电解质温度和氧化铝温度,以及降低氧化铝含量可以提高CCDA;提高电解质温度和降低电流有利于氧化铝分布更加均匀。最优的工艺条件为:电解质温度958.8℃、氧化铝含量2.679%(质量分数)、电流300 kA以及氧化铝温度200℃。

关 键 词：aluminum reduction cell alumina dissolution response surface methodology desirability approach heat and mass transfer 

分 类 号：TF821[冶金工程—有色金属冶金]