| 废物水泥窑共处置过程砷的固定特性及产物的环境安全性 |
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| 引用本文： | 王雷,金宜英,李润东,聂永丰.废物水泥窑共处置过程砷的固定特性及产物的环境安全性[J].化工学报,2011,62(3):816-822. |
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| 作者姓名： | 王雷 金宜英 李润东 聂永丰 |
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| 作者单位： | 沈阳航空航天大学辽宁省能源重点实验室;清华大学环境科学与工程系 |
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| 基金项目： | 国家自然科学基金项目，辽宁省创新团队项目 |
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| 摘 要： | 针对含As试样开展熟料煅烧实验、浸出实验、连续提取实验及能谱分析(SEM-EDS),以重金属浸出特性及化学形态为指标,考察As在熟料煅烧过程以及水化过程的迁移特性及固定机理.结果表明,煅烧过程中As的固定率较高,大于60%,As在熟料的主要矿物相C3S中的含量范围为0.4%～0.6%,As和Fe有很强的依存关系,煅烧过...
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| 关 键 词： | 砷 水泥窑共处置 浸出 化学形态 连续提取 能谱分析 |
Stabilization of arsenic in waste during co-processing with cement kiln and leaching characteristics of clinker |
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| WANG Lei,JIN Yiying,LI Rundong,NIE Yongfeng.Stabilization of arsenic in waste during co-processing with cement kiln and leaching characteristics of clinker[J].Journal of Chemical Industry and Engineering(China),2011,62(3):816-822. |
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| Authors: | WANG Lei JIN Yiying LI Rundong NIE Yongfeng |
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| Abstract: | The arsenic contained reagent was added to the cement raw meal to produce clinkers.Leaching test, sequential extraction procedures and SEM-EDS analysis were employed to evaluate the migration characteristics and the mineralogy change of arsenic during the sintering and hydration process.The results show the retention rate of arsenic during the sintering process is higher than 60%, while the content of arsenic in C3S, the major mineral phase in clinker was only 0.4%—0.6%.The SEM-EDS analysis of clinkers show arsenic has a strong dependent relationship with Fe.XRD analysis of clinkers showed the complex compounds with the chemical form of AsCrxFey or AsCrxVy were generated during the clinkerisation process, which were more stable under the high pH environment during the hydration process.Leaching test shows that the leaching concentration of arsenic has no considered increase compared to the blank samples.The BCR sequential extraction procedure analysis of the clinkers showed that the exchangeable water and acid-soluble phase of arsenic was only account for 0.01% of the total, while the easily reduced phase of arsenic had the biggest ratio, up to 39.35%.Finally, the residue fraction of arsenic accounts for 25.41% of the total, which show that the co-processing of high arsenic contained waste in the cement kiln has the potential environmental impact. |
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