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
符振江 1刘桂华 1齐天贵 1申雷霆 1彭志宏 1周秋生 1王一霖 1房辉 2王永林2
作者信息
- 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
- 折叠
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69.69 mg/g(以有机碳计),而高温溶出过程会显著降低TCA的吸附容量.
Abstract
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Key words
organics removal/tricalcium aluminate hexahydrate/sodium aluminate solution/zeta potential/electrical double layer引用本文复制引用
基金项目
National Natural Science Foundation of China(51874366)
出版年
2024
NETL
NSTL
万方数据