Retention of arsenic using alkali- and acid-bonded low temperature ceramics

W. Bruckard, D. Brew, E. Vance, G. Sparrow
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引用次数: 0

Abstract

ABSTRACT Immobilisation of AsIII and AsV using alkali- and acid-bonded low temperature ceramics (LTCs), respectively, has been investigated. Arsenic was loaded into these matrices as solubilised arsenic or as a solid via precipitation with a metal nitrate. Where appropriate, samples were heated to 1000°C to consolidate their microstructure and reduce their open porosity. Samples were assessed according to microstructural characterisation and standard leaching protocols. Alkali-bonded LTCs, even after the application of a thermal treatment, did not bind arsenic sufficiently to pass a TCLP protocol, whereas acid bonded LTCs showed better potential for immobilising As. At a loading of 5 wt% As2O5, a TCLP leach test on an acid bonded LTC resulted in As levels of 7 ppm, close to the regulatory limit of 5 ppm As.
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碱-酸结合低温陶瓷对砷的保留作用
摘要研究了分别使用碱键合和酸键合低温陶瓷(LTCs)对AsIII和AsV的固定化。砷以溶解的砷或通过与金属硝酸盐沉淀而以固体的形式加载到这些基质中。在适当的情况下,将样品加热至1000°C,以巩固其微观结构并降低其开放孔隙率。根据微观结构特征和标准浸出方案对样品进行评估。碱键合的LTCs,即使在应用热处理后,也不能充分结合砷以通过TCLP方案,而酸键合的LTC显示出更好的固定As的潜力 wt%的As2O5,在酸结合LTC上进行的TCLP浸出试验导致As水平为7 ppm,接近5的监管限值 ppm As。
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CiteScore
3.50
自引率
0.00%
发文量
6
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