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

氧化钙对流化床燃煤飞灰中砷的淋滤特性影响

1.
国家煤化工产品质量监督检验中心, 安徽淮南 232001;
2.
安徽理工大学化学工程学院, 安徽淮南 232001

基金项目: 国家质检总局科技计划（2013QK344）；淮南市科技计划（2013A04）；教育部留学回国人员科研启动基金。

详细信息

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。

中图分类号: X506
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出版历程
- 收稿日期: 2013-10-25
- 修回日期: 2014-01-19
- 刊出日期: 2014-05-30

Effect of CaO on leaching characteristics of arsenic in fly ash from fluidized bed coal combustion

1.
National Center of Coal Products Quality Supervision & Inspection, Huainan 232001, China;
2.
School of Chemical Engineering, Anhui University of Science and Technology, Huainan 232001, China

摘要

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。
- 砷 /
- 流化床 /
- 氧化钙 /
- 淋滤特性
Abstract: The leaching characteristics of arsenic in fly ash from coal combustion in lab-scale fluidized bed were clarified. Calcium oxide was mixed with fed coal for matching different Ca/S molar ratio to investigate the role of calcium on the leaching behavior of arsenic. The results indicate that increase in Ca/S molar ratio promotes the retention of arsenic in fly ash and in turn reduces its emission. The reaction between CaO and arsenic is largely dependent on the sulfation of CaO. Leaching of arsenic from fly ash is greatly dependent on the pH value of leachate. Alkali fly ash generates a high pH value solution during leaching test, facilitating the prohibition of arsenic leaching. The mechanism of arsenic leaching in alkali fly ash can be described as that arsenic first releases from fly ash quickly and then subjects to the reaction with calcium to form precipitate under high pH value condition.
- arsenic /
- fluidized bed /
- calcium oxide /
- leaching characteristic

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参考文献(15)

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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。

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Effect of CaO on leaching characteristics of arsenic in fly ash from fluidized bed coal combustion

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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。

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出版历程

Effect of CaO on leaching characteristics of arsenic in fly ash from fluidized bed coal combustion

计量

出版历程

目录

2023年《燃料化学学报（中英文）》评优结果公布！

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。