{"title":"Retention of arsenic using alkali- and acid-bonded low temperature ceramics","authors":"W. Bruckard, D. Brew, E. Vance, G. Sparrow","doi":"10.1080/25726641.2021.1942752","DOIUrl":null,"url":null,"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.","PeriodicalId":43710,"journal":{"name":"Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy","volume":null,"pages":null},"PeriodicalIF":0.9000,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mineral Processing and Extractive Metallurgy-Transactions of the Institutions of Mining and Metallurgy","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1080/25726641.2021.1942752","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MINING & MINERAL PROCESSING","Score":null,"Total":0}
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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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