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| 灼烧处理对纤蛇纹石反应活性的影响 | |
| 引用本文： | 高雄,朱辰,赵良.灼烧处理对纤蛇纹石反应活性的影响[J].高校地质学报,2012,18(2):273. |
| 作者姓名： | 高雄 朱辰 赵良 |
| 作者单位： | 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 |
| 基金项目： | 国家863项目，国家自然科学基金，中国地调局工作项目，江苏省科技厅创新学者攀登项目 |
| 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 |
Impact of Heat-pretreatment on the Reactivity between Ammonium Chloride and Chrysotile |
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| GAO Xiong , ZHU Chen , ZHAO Liang.Impact of Heat-pretreatment on the Reactivity between Ammonium Chloride and Chrysotile[J].Geological Journal of China Universities,2012,18(2):273. | |
| Authors: | GAO Xiong ZHU Chen ZHAO Liang |
| Institution: | Key Laboratory of Surficial Geochemistry, Ministry of Education; School of Earth Sciences and Engineering, Nanjing University, Nanjing |
| 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. |
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