Fe-Zn基废脱硫剂制备铁碳材料及其对废水微电解性能  

Utilization of Fe-Zn-based waste desulfurizer to produce Fe-C materials for removing COD from waste water

作　　者：张霄玲 于凤芹 皇甫林 王超[3] 李长明[2] 高士秋[2] 余剑[2] ZHANG Xiaoling;YU Fengqin;HUANGFU Lin;WANG Chao;LI Changming;GAO Shiqiu;YU Jian(School of Chemistry and Chemical Engineering,University of Chinese Academy of Science,Beijing 100049,China;State Key Laboratory of Multi-phase Complex System,Institute of Process Engineering,Chinese Academy of Sciences,Beijing 100190,China;School of Chemical Engineering,Xiangtan University,Xiangtan 411105,Hunan,China)

机构地区：[1]中国科学院大学化学与化工学院,北京100049 [2]中国科学院过程工程研究所多相复杂系统国家重点实验室,北京100190 [3]湘潭大学化工学院,湖南湘潭411105

出　　处：《化工学报》2020年第2期788-798,共11页CIESC Journal

基　　金：国家自然科学基金青年基金项目(21878310)

摘　　要：以Fe-Zn基废脱硫剂、煤、Na2CO3为原料进行高温炭热还原反应,制备了铁碳材料,实现了Zn和S的分离,有望能实现废脱硫剂的综合利用。考察不同工艺条件(配比,温度,时间)对铁碳材料品质,Zn单质分离效率和Na2S的收率影响。结果表明:反应温度≥900℃,煤∶废脱硫剂≥1,Na2CO3∶废脱硫剂≥1.5,反应时长≥2h,Zn、S的分离回收效率可达到95%以上。且900℃制备的铁碳材料比表面高达193.6 m^2/g,介孔孔体积为0.028cm^3/g,炭均匀附着于铁骨架。微电解-芬顿联用降解有机废水实验表明:仅微电解或微电解-芬顿联用(H2O2=COD=1500 mg/L)时,自制铁碳材料的稳定化学需氧量(COD)去除效率(41.78%、73.56%)都高于商业铁碳(8.43%、48.43%)。本文实验结果表明废脱硫剂与煤和碳酸钠混烧可实现废脱硫剂中Zn与S的分离回收,成功获得了比表面高、去除COD性能好的铁碳材料。The Fe-Zn-based waste desulfurizer,coal and Na2CO3 were used as raw materials to carry out hightemperature carbon thermal reduction reaction,and iron-carbon materials were prepared to realize the separation of Zn and S.It is expected to realize the comprehensive utilization of waste desulfurizer.The effect of different preparation parameters(e.g.,ratios,temperature,time)were investigated to improve the removal efficiency of Zn/S and obtain high-quality Fe-C materials.The best results can be achieved with separation efficiency of Zn and S above 95%with the ratio of 1/1/1.5 for coal/waste desulfurizer/Na2CO3 at 900℃for 2 h.Moreover,the specific surface area of the prepared Fe-C material can reach as high as 193.6 m^2/g with the mesoporous volume of 0.028 cm^3/g.In addition,the micro-electrolysis-Fenton test showed the removal efficiency of COD for the as-prepared Fe-C material are 41.78%and 73.56%without/with H2O2(H2O2=COD=1500 mg/L),respectively,which is much better than commercial Fe-C material with the removal efficiency of 8.43%and 48.43%on the same condition.These results demonstrate the heat treatment process of waste desulfurizer with Buliangou-coal and Na2CO3 may be an effective way for its resource utilization to separate Zn and S as well as produce Fe-C material.

关 键 词：Fe-Zn基废脱硫剂 炭热还原 微电解-芬顿 COD 

分 类 号：TQ420.6[化学工程]