Controlling sintering atmosphere to reduce the hazardous characteristics of low-energy cement produced with chromium compounds

doi:10.1016/j.jclepro.2012.12.027

CNU IR > College of Sustainable Environment and Recreation > Dept. of Environmental Resources Management > Periodical Articles > Item 310902800/27813

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题名:	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
贡献者:	環境資源管理系
关键词:	Chromium Cement Manufacturing Sintering Atmosphere Dicalcium Silicates Leaching
日期:	2013-03
上传时间:	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
显示于类别:	[Dept. of Environmental Resources Management] Periodical Articles

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