| 镉锌超积累植物伴矿景天焚烧飞灰的重金属浸出特性及安全处置 |
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| 引用本文： | 赵波,钟道旭,张亚平,吴龙华. 镉锌超积累植物伴矿景天焚烧飞灰的重金属浸出特性及安全处置[J]. 生态学杂志, 2022, 0(1): 116-123 |
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| 作者姓名： | 赵波 钟道旭 张亚平 吴龙华 |
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| 作者单位： | 中国科学院土壤环境与污染修复重点实验室;中国科学院大学;江苏省环境科学研究院;东南大学能源与环境学院 |
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| 基金项目： | 国家重点研发计划(2018YFC1802600);江苏省自然科学基金面上项目(BK20191501);江苏省环境工程重点实验室开放课题(ZX2017003)资助。 |
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| 摘 要： | 为探究超积累植物伴矿景天焚烧灰浸出回收有价金属的可行性,以800℃流化床焚烧旋风灰为材料,研究盐酸、硝酸、氯化铵以及不同浓度、液固比和浸出时间对飞灰中重金属浸出规律的影响,同时评价浸出残渣的安全性.结果 表明:浸提剂种类、浓度及液固比是影响浸出的重要参数,浸出时间的影响较小,酸性浸提剂浸出能力明显强于氯化铵盐溶液浸出;...
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| 关 键 词： | 焚烧飞灰 重金属 浸出 伴矿景天 |
Leaching of potentially toxic elements and safe treatment of fly ash following incineration of the cadmium and zinc hyperaccumulator Sedum plumbizincicola |
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| ZHAO Bo,ZHONG Dao-xu,ZHANG Ya-ping,WU Long-hua. Leaching of potentially toxic elements and safe treatment of fly ash following incineration of the cadmium and zinc hyperaccumulator Sedum plumbizincicola[J]. Chinese Journal of Ecology, 2022, 0(1): 116-123 |
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| Authors: | ZHAO Bo ZHONG Dao-xu ZHANG Ya-ping WU Long-hua |
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| Affiliation: | (CAS Key Laboratory of Soil Environment and Pollution Remediation,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China;University of Chinese Academy of Sciences,Beijing 100049,China;Key Laboratory of Environmental Engineering of Jiangsu Province,Jiangsu Provincial Academy of Environmental Sciences,Nanjing 210036,China;Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of the Ministry of Education,School of Energy and Environment,Southeast University,Nanjing 210096,China) |
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| Abstract: | We used fluidized bed incineration(800 ℃) cyclone ash to assess the feasibility of recovering metal(loid)s in the incineration ash of the hyperaccumulator Sedum plumbizincicola.We examined the factors affecting the leaching characteristics of metal(loid)s in fly ash,namely extractant type(hydrochloric acid,nitric acid or ammonium chloride) and concentration,liquid/solid ratio and leaching time.Furthermore,we evaluated the safety of the leaching residues.The type,concentration,and liquid-solid ratio of the extractant were important parameters influencing metal leaching performance,whereas leaching time had minor influence.Acids(hydrochloric acid,HCl;or nitric acid,HNO3) showed higher leaching efficiency than ammonium chloride.The leaching characteristics of cadmium(Cd),zinc(Zn),and lead(Pb) in fly ash can be described by the cationic leaching mode.The leaching efficiency of Cd,Zn,and Pb increased with increasing concentration and liquid/solid ratio of extractants,with the maximum leaching rates reaching 94.9%,90.2%,and 92.4%,respectively.The environmental risk from leaching residues was effectively reduced by increasing the liquid/solid ratio of the extractant.An optimum leaching procedure with 1 mol·L-1 HCl at a liquid/solid ratio of 16:1 for 30 minutes is suggested for the routine treatment of fly ash of S.plumbizincicola,which may meet the requirement for landfill.The leachates may be further used for the recovery of high-value metals. |
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| Keywords: | incineration fly ash heavy metal leaching Sedum plumbizincicola |
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