含砷石灰铁盐渣的理化特性及其浸出行为（英文）

发布时间：2018-01-20 22:53

本文关键词： 含砷固废石灰铁盐渣理化特性浸出行为 BCR连续提取法　出处：《Transactions of Nonferrous Metals Society of China》2017年05期 　论文类型：期刊论文

【摘要】：以典型石灰铁盐法处理二种含砷废水产生的污泥(污酸渣和砷酸钙渣)为研究对象,采用ICP-AES、SEM-EDS、XRD、XPS和化学物相分析等检测手段对其化学组成、形貌特征、物相结构及砷的赋存状态进行研究,采用毒性浸出实验和BCR三步连续提取法考察污泥中砷的浸出行为。研究结果表明,污酸渣和砷酸钙渣中砷的含量分别为2.5%和21.2%,主要组成物相为砷酸盐及砷氧化物,均以无定型的颗粒均匀分散或团聚在污泥中。砷的浸出毒性超出TCLP标准规定限值的119和1063倍,浸出率分别为47.66%和50.15%。砷以酸可提取态和可还原态为主,两者共占90%左右,而稳定的残渣态含量相对较低,这是含砷石灰铁盐渣浸出毒性大、环境活性高的直接原因。本研究为含砷石灰铁盐渣无害化处理技术提供了大量有用的基本数据。
[Abstract]:Two kinds of sludge treatment of arsenic containing wastewater produced by lime ferric salt method (typical waste acid slag and calcium arsenate slag) as the research object, using ICP-AES, SEM-EDS, XRD, XPS and chemical phase analysis and feature detection methods of its chemical composition, phase structure and occurrence of arsenic were studied by the leaching test and BCR three step sequential extraction of arsenic in activated sludge was investigated. The results show that the leaching behavior of waste acid content, slag and slag calcium arsenate arsenic were 2.5% and 21.2%, the main composition phase of arsenate and arsenic oxides are amorphous particles dispersed or reunion in the sludge. The leaching toxicity of arsenic exceeded the TCLP standard limit of 119 and 1063 times, the leaching rate is 47.66% and 50.15%. respectively with arsenic acid extractable and reducible, both accounted for about 90%, the residual content and stability is relatively low, it is with arsenic leaching residue This study provides a large number of useful basic data for the harmless treatment technology of arsenic containing lime iron salt slag.

【作者单位】：中南大学冶金与环境学院;中南大学国家重金属污染防治工程技术研究中心;
【基金】：Project(201509050)supported by Special Program on Environmental Protection for Public Welfare,China Projects(51474247,51634010)supported by the National Natural Science Foundation of China Project(2015CX001)supported by Grants from the Project of Innovation-driven Plan in Central South University,China
【分类号】：X703
【正文快照】： 1 IntroductionArsenic pollution both in aqueous solutions[1-8]and contaminated soils[9-14]aroused a significantenvironmental concern.Various treatment processes suchas coagulation,precipitation,ion exchange andadsorption were extensively employed for the

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