Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第31卷    第3期    总第264期    2021年3月

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文章编号:1004-0609(2021)-03-0715-09
废汞触媒活性炭再生实验
王盛才1,杨 琴2,张明光2,宋剑飞1,李海龙2,郭学益1

(1. 中南大学 冶金与环境学院,长沙 410083;
2. 中南大学 能源科学与工程学院,长沙 410083
)

摘 要: 废汞触媒无害化处理回收汞后形成大量以活性炭为主要组分的废弃物。本文利用盐酸化学再生与热再生相结合的方法,对废汞触媒活性炭进行再生。比较不同再生条件下的再生性能,分析盐酸浓度、浸渍时间、热再生温度和热再生时间的影响。对再生后的活性炭样品进行了表征分析、吸附指标测试以及固定床脱汞实验。结果表明:采用化学再生与热再生相结合的方法可以实现废汞触媒活性炭的高效再生;优化的再生条件为酸浓度值0.6 mol/L、化学再生时间0.5 h、热再生温度750 ℃、热再生时间2 h;再生活性炭碘吸附值最高可达1022.12 mg/g,亚甲基蓝吸附值最高可达182.34 mg/g,与新鲜活性炭相当;再生活性炭的汞吸附效率在3 h内可以维持80%以上。本文提供一种简单、经济、高效的废汞触媒活性炭再生方法,有利于实现废汞触媒的循环利用。

 

关键字: 废汞触媒;活性炭;化学再生;热再生;汞

Regeneration of activated carbon from waste mercury catalyst
WANG Sheng-cai1, YANG Qin2, ZHANG Ming-guang2, SONG Jian-fei1, LI Hai-long2, GUO Xue-yi1

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
2. School of Energy Science and Engineering, Central South University, Changsha 410083, China

Abstract:After the recovery of mercury by heat treatment of waste mercury catalyst, a large amount of waste with activated carbon as the main component was formed. The new method combined hydrochloric acid chemical regeneration with thermal regeneration processes. The regeneration performances under different regeneration conditions were compared, the effects of hydrochloric acid concentration, impregnation time, thermal regeneration temperature and thermal regeneration time were analyzed. The characteristics of the regenerated activated carbon samples were analyzed, the adsorption indexes were tested and the mercury removal experiment was carried out in fixed bed. The results show that the mercury adsorption capacity of the regenerated activated carbon significantly is improved after the combination treatment of chemical regeneration and thermal regeneration. The optimal regeneration conditions are as follows: acid concentration of 0.6 mol/L, chemical regeneration time of 0.5 h, thermal regeneration temperature of 750 ℃ and thermal regeneration time of 2 h. After regeneration, the highest iodine adsorption value is 1022.12 mg/g activated carbon, methylene blue adsorption value is 182.34 mg/g activated carbon, and after continuous adsorption by fixed bed for 3 h, the mercury adsorption efficiency of regenerated activated carbon is above 80%. To realize the high value utilization of waste activated carbon from waste mercury catalyst after mercury recovery, a low cost, simple and efficient method to regenerate activated carbon from waste mercury catalyst is provided in this work.

 

Key words: waste mercury catalyst; activated carbon; chemical regeneration; thermal regeneration; mercury

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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