东南大学学报（英文版）2022，Vol.38Issue(1)：62-69,8.DOI:10.3969/j.issn.1003-7985.2022.01.010
混钙高岭土炉内原位捕集气态重金属的试验研究
Experimental study on in-situ capture of gaseous heavy metals by calcium-doped kaolinite in furnace
摘要
Abstract
For revealing the effect of calcium on heavy metal in-furnace capture by kaolinite,gaseous PbCl2 and CdCl2 adsorptions by calcium-doped kaolinite at high temperatures and their mechanisms were investigated through experiments in a fixed-bed furnace,where factors of temperatures and the mixing proportion of limestone and kaolinite were considered.The results show that the adsorption efficiency of cadmium by the mixed sorbents is lower than that by single sorbents,mainly due to the consumption of lime or limestone,whereas that of lead varies at different reaction temperatures.Two kinds of areas,named as Ca-rich zone and Ca-low zone,are found in the sorbents of calcium-doped kaolinite.The Ca-rich zone tends to lessen the capture efficiencies for the two metals,whereas the Ca-low zone can enhance their adsorption.The heterogeneous distributions of calcium have multiple effects on metal sorption,including the diffusion enhancement through the eutectic effect by forming low-melting-point substances,the inhibition by the competitive occupation of reaction sites,and the block of pores caused by sintering at a high temperature.关键词
吸附/重金属/高温/高岭土/矿物反应Key words
adsorption/heavy metal/high temperature/kaolinite/mineral reaction分类
资源环境引用本文复制引用
查健锐,黄亚继,夏志鹏,朱志成..混钙高岭土炉内原位捕集气态重金属的试验研究[J].东南大学学报（英文版）,2022,38(1):62-69,8.基金项目
The National Natural Science Foundation of China(No.51976036),the Scientific Research Foundation of the Graduate School of Southeast University(No.3203009748). （No.51976036）
