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J4 ›› 2012, Vol. 18 ›› Issue (2): 273-.

• CO2封存 • 上一篇    下一篇

灼烧处理对纤蛇纹石反应活性的影响

高 雄,朱 辰,赵 良   

  1. 表生地球化学教育部重点实验室,南京大学 地球科学与工程学院,南京
  • 出版日期:2012-06-20 发布日期:2012-07-11
  • 通讯作者: 赵良,男,副教授,从事二氧化碳封存相关矿物学、地球化学等方面的教学和科研工作;E-mail: zhaoliang@nju.edu.cn
  • 作者简介: 高雄,男,硕士研究生,地球化学专业; E-mail: gaoxiong01@gmail.com

Impact of Heat-pretreatment on the Reactivity between
Ammonium Chloride and Chrysotile

GAO Xiong, ZHU Chen, ZHAO Liang    

  1. Key Laboratory of Surficial Geochemistry, Ministry of Education; School of Earth Sciences and Engineering, Nanjing University, Nanjing
  • Online:2012-06-20 Published:2012-07-11
  • Contact: Zhao Liang, Associate Professor;E-mail: zhaoliang@nju.edu.cn

摘要:

    使用可循环的NH4Cl 溶液作为中间媒介获取Mg2+用于CO2 矿物封存是一种新兴工艺,但是纤蛇纹石在NH4Cl 溶液中较
低的Mg2+浸出率却是这项工艺发展的瓶颈。针对这一问题,本文采用灼烧处理对纤蛇纹石进行改性。结果表明, 灼烧处理
可以有效改变纤蛇纹石中Mg2+反应活性。在600℃灼烧后,所得产物与NH4Cl 反应的转化率达到55.64%,比灼烧前提高了
约43%。600℃灼烧处理脱除了纤蛇纹石外羟基,增大了矿物的反应表面积和具反应活性的Mg2+的量,促进了其与NH4Cl 的
反应 ;脱除内羟基后,具反应活性Mg2+减少,与NH4Cl 反应的转化率降低。

关键词: 氯化铵, 纤蛇纹石, 灼烧, 二氧化碳矿物封存

Abstract:

       Using recyclable NH4Cl (ammonium chloride) as medium of CO2 mineral sequestration has become an emerging
technology, while the low ammonium chloride leaching rate of chrysotile turn into a bottleneck restricting the development of this
process. To solve the problem, this study carried on heat-pretreatment to modify the property of chryattile. Results show that heatpretreatment
can efficiently increase the reactivity of Mg2+ leached from chryostile. After heated at 600℃, the leaching effuciency of chryostile reacted with NH4Cl can reach to 55.64%, increasing about 43%, compared to reaction without heating. Heatpretreatment at 600℃ can remove the outer hydroxyl group in the layers of chryostile, and greatly increase the reactive surface area of minerals and reactive mg2+ it concentration, leading to the improvement of reaction rate. But if the roasting temperature was increased above 600℃, the leaching efficiency of chryostile dropped again since the reactive Mg2+ ot content decreases after removing inner hydroxyl group in the layers of chryostile.

Key words: ammonium chloride, chrysotile, heat-pretreatment, CO2 mineral sequestration

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