基于六水铝酸三钙的双电层调控从铝酸钠溶液中短流程脱除有机物  

A short process for organics removal from sodium aluminate solution by regulating electrical double layer of tricalcium aluminate hexahydrate

作　　者：符振江 刘桂华 齐天贵 申雷霆 彭志宏 周秋生 王一霖 房辉 王永林 Zhen-jiang FU;Gui-hua LIU;Tian-gui QI;Lei-ting SHEN;Zhi-hong PENG;Qiu-sheng ZHOU;Yi-lin WANG;Hui FANG;Yong-lin WANG(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Longkou Donghai Alumina Company Limited,Longkou 265713,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]龙口东海氧化铝有限公司,龙口265713

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第7期2354-2366,共13页中国有色金属学报（英文版）

基　　金：the financial support provided by the National Natural Science Foundation of China(No.51874366)。

摘　　要：从铝酸钠溶液中经济地脱除有机物是长期以来的研究重点。基于叶滤环节将六水铝酸三钙(TCA)作为助滤剂的工艺,提出一种短流程同时滤除杂质颗粒和吸附脱除有机物的新方法。在浓缩铝酸钠溶液中制备结晶度低、TCA含量高、表面能高、晶格畸变大的超细TCA样品。同时,TCA样品在碱性溶液中的Zeta电位线性依赖于TCA含量,揭示二元混合物Zeta电位的可加性。描述在碱性溶液中TCA二元混合物双电层的演化规律。此外,超细TCA样品对长烷基链及高相对分子质量有机物具有较高的吸附容量,对腐殖酸钠的吸附容量可达69.69mg/g(以有机碳计),而高温溶出过程会显著降低TCA的吸附容量。The economical removal of organics from sodium aluminate solutions has been required for decades.Based on security filtration using tricalcium aluminate hexahydrate(TCA)as a filter aid,a novel short process to eliminate impurity particles and remove organics simultaneously was presented.Ultrafine TCA samples with poor crystallization,high TCA content,high surface free energy,and large lattice distortion were prepared in the concentrated sodium aluminate solution.The zeta potential of the TCA binary mixture in alkaline solutions was linearly depended on the TCA content,suggesting the additivity of the zeta potential in the binary mixture.The variation in the electrical double layer of the TCA binary mixture was demonstrated in the alkaline solution.Furthermore,the ultrafine TCA exhibited a high adsorption capacity for organics with long alkyl chains and high relative-molecular-mass.The adsorption capacity of 69.69 mg/g organic carbon for sodium humate was achieved,whereas the digestion at a high temperature remarkably reduced the adsorption capacity of TCA.

关 键 词：有机物脱除 六水铝酸三钙 铝酸钠溶液 ZETA电位 双电层 

分 类 号：TQ131.12[化学工程—无机化工] O647.3[理学—物理化学]