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氧化钙对流化床燃煤飞灰中砷的淋滤特性影响

焦发存 ,  周博涵 ,  闫玉乐 ,  周玉辉 ,  董众兵

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引用本文: 焦发存, 周博涵, 闫玉乐, 周玉辉, 董众兵. 氧化钙对流化床燃煤飞灰中砷的淋滤特性影响[J]. 燃料化学学报, 2014, 42(5): 534-538. shu
Citation:  JIAO Fa-cun, ZHOU Bo-han, YAN Yu-le, ZHOU Yu-hui, DONG Zhong-bing. Effect of CaO on leaching characteristics of arsenic in fly ash from fluidized bed coal combustion[J]. Journal of Fuel Chemistry and Technology, 2014, 42(5): 534-538. shu

氧化钙对流化床燃煤飞灰中砷的淋滤特性影响

    通讯作者: 焦发存(1980- ),男,博士,工程师,主要从事燃煤过程中污染物排放及控制技术研究。Tel:0554-6299080; E-mail:fcjiao80@gmail.com。
  • 基金项目:

    国家质检总局科技计划(2013QK344) (2013QK344)

    淮南市科技计划(2013A04) (2013A04)

    教育部留学回国人员科研启动基金。 

摘要: 在实验室小型流化床实验装置上,利用添加氧化钙研究了原煤中钙硫比变化对燃煤过程中砷在飞灰中的富集规律和飞灰中砷的浸出特性的影响。实验结果表明,增加钙硫比能有效促进砷在飞灰中富集,降低砷的排放。砷与氧化钙的反应受制于钙的硫化反应控制。飞灰中砷的浸出与滤液pH值关系显著,碱性飞灰导致滤液pH值增大,能有效抑制飞灰中砷的浸出。碱性飞灰中砷的浸出历程为飞灰中砷在短时间内快速溶出;随着滤液pH值增大,溶出的砷与钙发生二次反应形成钙砷化合物沉淀,降低滤液中砷浓度。

English

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  • 收稿日期:  2013-10-25
  • 网络出版日期:  2014-01-19
通讯作者: 陈斌, bchen63@163.com
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