期刊论文

Preparation of zeolite from calcium aluminate leaching residues and its adsorption properties for zinc metallurgical wastewater

中文

中国有色金属学报

1004-0609

2019

29

11

2653-2662

10.19476/j.ysxb.1004.0609.2019.11.22

湖南省自然科学基金资助项目(2016JJ6017) 湖南省重点研发计划项目(2017SK2254) 湖南省教育厅项目(15C0245)。

本校为第一机构

以聚合氯化铝(PAC)生产过程中铝钙粉浸出渣为原料,通过酸浸–焙烧–水热晶化工艺制备沸石,并研究其对锌冶炼废水中重金属的去除效果。结果表明:铝钙粉浸出渣通过酸浸–焙烧–水热晶化过程,当原料n(SiO_2)/n(Al_2O_3)=2时,产物物相为结构完整的A型沸石;当原料n(SiO_2)/n(Al_2O_3)=6时,产物物相为结构完整的P型沸石。拟二级动力学方程计算得到A型沸石对Zn~(2+)、Cd~(2+)的平衡吸附量分别为97.09、12.39 mg/g,P型沸石对Zn~(2+)、Cd~(2+)的平衡吸附量分别为57.84、10.82 mg/g。Freundlich吸附等温线拟合结果表明,A型沸石和P型沸石吸附Zn~(2+)、Cd~(2+)机理均为非均相表面的复杂吸附。当废水pH为8、吸...

Zeolites were prepared by the process of HCl leaching, roasting and hydrothermal crystallization using calcium aluminate leaching residues(CALR)which were generated from the production process of polyaluminum chloride, and raw their removal effect on heavy metals from zinc metallurgical wastewater were studied.The results show that, after CALR is treated through the process of HCl leaching, roasting and hydrothermal crystallization, when n(SiO_2)/n(Al_2O_3)in raw material is 2, the product is a structurally intact Zeolite A, when n(SiO_2)/n(Al_...