侧壁定向凝固偏析法一次提纯工艺生产精铝产品实践  

Practice of Producing Pefined Aluminum Products by One-Time Purification Process of Side Wall Directional Solidification Segregation Method

作　　者：薛深壬 刘铭恩 XUE Shenren;LIU Mingen

机构地区：[1]广西百矿铝业有限公司,百色田阳533000

出　　处：《绿色矿冶》2023年第3期40-44,共5页Sustainable Mining and Metallurgy

摘　　要：某企业采用侧壁定向凝固偏析法生产精铝,出现锌和钒杂质含量无法达到行业标准3N5精铝的要求。本文通过理论分析原铝中各杂质元素的平衡分配系数并结合生产实际可知,锌杂质无法满足要求的原因是原铝中锌杂质含量较高,且锌在铝中的平衡分配系数相对偏大,去除效率低;钒杂质无法满足要求的原因是钒在铝中的平衡分配系数大于1,为5.1,无法通过偏析法提纯去除。本文根据精铝杂质控制要求和提纯除杂效率,推算出氧化铝中各杂质成分的控制要求,提出采用高品位优质原料的措施;针对钒无法通过偏析法去除的问题,采用硼砂和氯化锶除钒的方案。最终应用定向凝固偏析法成功生产合格的精铝产品。An enterprise uses the side wall directional solidification segregation method to produce refined aluminum,and the content of zinc and vanadium impurities cannot meet the requirements of the industry standard 3N5 refined aluminum.In this paper,through theoretical analysis of the equilibrium distribution coefficient of each impurity element in primary aluminum and combined with the actual production,it can be seen that the reason why zinc impurities cannot meet the requirements is that the content of zinc impurities in primary aluminum is high,and the equilibrium distribution coefficient of zinc in aluminum is relatively large,and the removal efficiency is low.The reason why vanadium impurities cannot meet the requirements is that the equilibrium distribution coefficient of vanadium in aluminum is 5.1,which is larger than 1 and cannot be purified by segregation method.Therefore,according to the impurity control requirements of refined aluminum and the purification and impurity removal efficiency,the control requirements of each impurity component in the alumina were calculated,and put forward the measures to adopt high-grade and high-quality raw materials;in order to solve the problem that vanadium cannot be removed by segregation method,borax and strontium chloride were used to remove vanadium.Finally,the directional solidification segregation method was successfully applied to produce qualified refined aluminum products.

关 键 词：精铝 偏析法 一次提纯 定向凝固 锌 钒 杂质去除 

分 类 号：TF821[冶金工程—有色金属冶金]