氧化铝生产中石灰消化残渣高效回收利用技术研究与实践  

Research and Practice on Hign Efficient Recycling Technology of Lime Digestion Residue in Alumina Production

作　　者：张天星 曾宪飞 ZHANG Tianxing;ZENG Xianfei

机构地区：[1]贵州华锦铝业有限公司,贵州贵阳551405

出　　处：《绿色矿冶》2023年第4期46-49,共4页Sustainable Mining and Metallurgy

摘　　要：本文针对氧化铝企业的石灰消化残渣,提出了一种将消化残渣代替石灰返回氧化铝生产流程的回收利用新工艺。消化残渣经破碎磨细后与石灰乳混合用于碳酸钠苛化,苛化试验结果表明,随着石灰消化残渣添加量的增加,苛化效率逐渐增大,说明石灰消化残渣中的有效成分CaO能够进行苛化反应,利用消化残渣替代石灰具有可行性。为此,改造传统处理工艺,增设残渣处理工艺,使得残渣由完全开放堆存转运处理转变为连续封闭再处理,并将该工艺应用于某氧化铝企业,获得了较好的经济效益。该工艺避免残渣返回生产系统前端发生反苛化反应,减少碳酸钠进入系统,降低排盐消耗,实现了残渣在线连续封闭处理,解决了传统残渣完全开放处理的不足,取得较好的经济效益和社会效益,具有一定的推广应用价值。Aiming at the lime digestion residue of alumina enterprises,this paper proposed a new process of recycling the digestion residue instead of lime to return to the alumina production process.The digestion residue was mixed with lime milk for causticization of sodium carbonate after crushing and grinding.The results of causticization test showed that the causticization efficiency increased gradually with the increase of lime digestion residue,indicating that the effective component CaO in lime digestion residue could carry out causticization reaction,and it was feasible to replace lime with digestion residue.Therefore,the traditional treatment process was reformed and the residue treatment process was added,so that the residue was changed from completely open storage and transportation treatment to continuous closed retreatment.The process was applied to an alumina enterprise,and good economic benefits were obtained.The process avoids the anti-causticization of the residue returning to the front end of the production system,reduces the sodium carbonate entering the system,reduces the salt discharge consumption,realizes the online continuous closed treatment of the residue,solves the shortcomings of the traditional complete open treatment of the residue,and achieves better economic and social benefits.It has certain application value.

关 键 词：石灰消化残渣 回收利用 消化反应 苛化 反苛化 

分 类 号：TF821[冶金工程—有色金属冶金]