(1. 中南大學(xué) 冶金與環(huán)境學(xué)院，長沙 410083；
2. 中南大學(xué) 能源科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 廢汞觸媒無害化處理回收汞后形成大量以活性炭為主要組分的廢棄物。本文利用鹽酸化學(xué)再生與熱再生相結(jié)合的方法，對廢汞觸媒活性炭進(jìn)行再生。比較不同再生條件下的再生性能，分析鹽酸濃度、浸漬時間、熱再生溫度和熱再生時間的影響。對再生后的活性炭樣品進(jìn)行了表征分析、吸附指標(biāo)測試以及固定床脫汞實驗。結(jié)果表明：采用化學(xué)再生與熱再生相結(jié)合的方法可以實現(xiàn)廢汞觸媒活性炭的高效再生；優(yōu)化的再生條件為酸濃度值0.6 mol/L、化學(xué)再生時間0.5 h、熱再生溫度750 ℃、熱再生時間2 h；再生活性炭碘吸附值最高可達(dá)1022.12 mg/g，亞甲基藍(lán)吸附值最高可達(dá)182.34 mg/g，與新鮮活性炭相當(dāng)；再生活性炭的汞吸附效率在3 h內(nèi)可以維持80%以上。本文提供一種簡單、經(jīng)濟(jì)、高效的廢汞觸媒活性炭再生方法，有利于實現(xiàn)廢汞觸媒的循環(huán)利用。
關(guān)鍵字: 廢汞觸媒；活性炭；化學(xué)再生；熱再生；汞
（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
