林业工程学报2025，Vol.10Issue(3)：61-67,7.DOI:10.13360/j.issn.2096-1359.202406008
废粉状活性炭的成型与再生试验
Research on the formation and regeneration of spent powdered activated carbon
摘要
Abstract
Powdered activated carbon is widely used for decolorization.Once this type of activated carbon becomes ineffective,it is typically disposed as solid waste,which not only increases the environmental protection costs for enterprises,but also wastes resources.Therefore,regenerating and reusing spent powdered activated carbon for decolorization is of important research significance.In order to achieve the regeneration and high-value utilization of spent powdered activated carbon,this study used attapulgite as a binder to bond and shape spent powdered activated carbon,followed by thermal regeneration.The effects of material properties,forming conditions,regeneration conditions and other factors on the performance and pore structure of activated carbon were investigated.The maximum adsorption capacity and adsorption heat of formed activated carbon on n-butane were studied by the synchronous thermal analyzer(TG-DSC).The results showed that the attapulgite was a good molding adhesive and flame retardant.Its good thermal stability was the cause of formed activated carbon with high yield,ignition point and low adsorption heat release.Heat treatment can regenerate spent powdered activated carbon.The thermal weight loss process of spent powdered activated carbon involved the pyrolysis of organic adsorbates and the decomposition of inorganic CaCO3.The optimal thermal regeneration temperature was 500℃and the thermal regeneration time was 15 min.The optimal thermal regeneration temperature of formed activated carbon was consistent with that of spent powdered activated carbon,indicating that the addition of attapulgite neither alter the release conditions of adsorbed substances in spent powdered activated carbon,nor did it block its pores.This was further supported by the linear correlation between the addition ratio of attapulgite and both the iodine adsorption value and the total pore volume of activated carbon.The optimal conditions for preparing formed activated carbon were the attapulgite addition of 40%,heat treatment time of 500℃,and heat treatment time of 15 min.The iodine adsorption value of the prepared formed activated carbon was 580 mg/g,the adsorption rate of carbon tetrachloride was 43.49%,the ignition point was 358℃,the strength was 92%,the maximum adsorption capacity of butane was 59.05 mg/g,the heat of adsorption per unit mass and per unit adsorption capacity for n-butane were-37.049 J/g and-0.627 J/mg,respectively.This study successfully achieved the formation and regeneration of spent powdered activated carbon,resulting in the preparation of high-performance formed activated carbon that is high-temperature resistant and safe to use,thereby expanding the high-value utilization of spent powdered activated carbon.关键词
活性炭/废粉状活性炭/凹凸棒土/成型/再生利用Key words
activated carbon/spent powdered activated carbon/attapulgite clay/forming/regeneration分类
化学工程引用本文复制引用
许伟,刘军利,孙康,呼生春,洪超,黄毅成..废粉状活性炭的成型与再生试验[J].林业工程学报,2025,10(3):61-67,7.基金项目
云南省重大科技专项计划项目(202402AE090027). （202402AE090027）
