摘要
工业含氯固废对环境危害很大,以水洗方法脱氯可能产生大量的废水和二次污染。采用有机胺萃取耦合CO_(2)矿化反应方法对氯化提钛尾渣进行了脱氯处理,通过有机胺萃取Cl^(-)避免了大量废水的产生。对比研究了水洗、矿化水洗等工艺的参数,结果表明,在更低的耗水量下,萃取矿化可以达到与3级水洗和3级逆流水洗相同的脱氯效果。在工业低温氯化矿渣的脱氯实验中,可以达到90%的脱氯效率,重复脱氯实验结果表明该工艺具有很好的重复性。有机胺再生实验结果表明有机胺再生率可以达到99%,通过有机胺萃取循环再生,矿化水洗技术可以实现无水排放的废渣脱氯工艺。
Chlorinated solid wastes discharged from industry are greatly harmful to environment,the removal of chlorine by water washing may produce large amount of chlorine-contained waste water that results in secondary pollution.In this work,a new method of CO_(2) mineralization coupled with organic amine extraction was applied to remove the chlorine residue in slag from TiO_(2) production.By extracting Cl^(−) into organic phase,the discharge of chlorine-contained water was avoided in the washing process.The process parameters of both water washing and washing-mineralization were comparatively investigated,and the results showed that washing-mineralization consumed less water and achieved the same removal efficiency of three-stages countercurrent washing.In the de-chloride process of the low temperature chlorination slag from a plant,the de-chlorination ratio reached 90%and the tests showed the method was well repeatable.In the organic amine regeneration experiment,the organic amine regeneration ratio reached 99%,which showed the organic amine was recyclable.Because the amine is regeneratable and recyclable,the washing-mineralization method avoids the dischargement of waste water in de-chlorination of chlorine-contained slag.
作者
沈坤杰
唐思扬
钟山
梁斌
SHEN Kunjie;TANG Siyang;ZHONG Shan;LIANG Bin(School of Chemical Engineering,Sichuan University,Chengdu 610207,China;Institute of New Energy and Low-Carbon Technology,Sichuan University,Chengdu 610207,China)
出处
《化学反应工程与工艺》
CAS
2023年第3期234-239,共6页
Chemical Reaction Engineering and Technology
基金
国家重点研发计划项目(2018YFB06057)。
关键词
含氯固废
有机胺萃取
二氧化碳矿化
脱氯
chlorinated solid wastes
amine extraction
carbon dioxide mineralization
de-chlorination
