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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/27813


    標題: Controlling sintering atmosphere to reduce the hazardous characteristics of low-energy cement produced with chromium compounds
    作者: Chen, Ying-Liang
    Lai, Yi-Chieh
    Lin, Chien-Jung
    Chang, Yi-Kuo
    Ko, Ming-Sheng
    貢獻者: 環境資源管理系
    關鍵字: Chromium
    Cement Manufacturing
    Sintering Atmosphere
    Dicalcium Silicates
    Leaching
    日期: 2013-03
    上傳時間: 2014-05-26 10:44:43 (UTC+8)
    出版者: Elsevier Sci Ltd
    摘要: Chromium is a common element present in cement clinkers, and its toxicity is highly related to the oxidation states. It is known that hexavalent chromium, Cr(VI), is much more toxic than other oxidation states, and is easily formed after a high-temperature burning process. This paper describes the influence of sintering atmosphere on phase transformation of dicalcium silicates (Ca2SiO4, C2S) and chromium oxidation states in the production of a low-energy cement, and examines the chromium leachability of the resulting clinkers. The results show that C2S can be synthesized under both oxidizing and reducing atmospheres, and the presence of chromium including Cr(III) and Cr(VI) was effective in inhibiting C2S from transforming to the nonhydraulic gamma phase. While the reducing atmosphere relatively increased the level of chromium evaporation, it prevented most of the residual chromium being Cr(VI) and reduced chromium leaching, and this therefore makes the resulting clinkers more environmentally-friendly. (C) 2013 Elsevier Ltd. All rights reserved.
    關聯: Journal of Cleaner Production, v.43 n. pp.45-51
    Appears in Collections:[環境資源管理系(所)] 期刊論文

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