氯化铵浸取纤蛇纹石动力学研究

高雄; 孟烨; 朱辰; 赵良

doi:10.3969/j.issn.1001-4810.2011.04.020

氯化铵浸取纤蛇纹石动力学研究

doi: 10.3969/j.issn.1001-4810.2011.04.020

南京大学地球科学与工程学院/表生地球化学研究所

基金项目: 国家自然科学基金项目(批准号:41002014)、国家863项目(批准号:2009AA06Z112)以及国家地调局项目(批准号:水[2010]矿评03-07-08)联合资助

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出版历程
- 收稿日期: 2011-10-14
- 发布日期: 2011-12-25

Study on the kinetics of extracting chrysotile with ammonium chloride

Institute of Surficial Geochemistry, School of Earth Sciences and Engineering, Nanjing University

摘要

摘要: 较低的矿物溶解率和反应剂的不可循环利用是CO2矿物封存发展的两大难题。针对这些问题,本文提出了一种新的以可循环的NH4Cl溶液作为中间媒介的CO2矿物封存工艺,并系统地研究了蛇纹石在氯化铵溶液中的液-固两相的反应动力学。实验研究发现:(1)纤蛇纹石的浸取符合Elovich模型,浸取过程基本在1h左右完成,在100℃、5mol/L氯化铵溶液中,纤蛇纹石的浸取率达到12.67%;(2)温度对纤蛇纹石初始反应速率的影响显著,温度越高,反应速率越快;(3)当氯化铵浓度在1~5mol/L范围内变化时,它对镁离子浸取率的影响不明显,反应速率随着浓度的升高而有所增加;(4)本实验反应表现出来的活化能大小为129.56kJ/mol。
- 氯化铵 /
- 纤蛇纹石 /
- Elovich模型 /
- 活化能 /
- 二氧化碳矿物封存
Abstract: Low mineral dissolution rate and the unrecyclable use of additives are two puzzles development of CO2 sequestration by mineral carbonation. This paper presents a new process of CO2 sequestration by mineral carbonation, which adopts NH4Cl solution as leaching agent, and study the reaction kinetics of chrysotile in NH4Cl solution in a systematic way. The results show that dissolution process is in conformity with the Elovich model and leaching process is usually finished in 1 hour. The leaching rate of magnesium can reach 12.67% when the concentration of NH4Cl is 5mol/L and the reacting temperature is 100℃. And the leaching rate rise with temperature, meanwhile, neither does the ammonium chloride concentration nor the solid/liquid ratio have much influence on it. The activation energy of dissolution process is determined to be 129.56kJ/mol in the test.
- ammonium chloride /
- chrysotile /
- Elovich model /
- activation energy /
- CO2 sequestration by mineral carbonation

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参考文献(19)

[1]	Teir S, Revitzer H, Eloneva S, et al, Dissolution of natural serpentinite in mineral and organic acids［J］. International Journal of Mineral Processing, 2007, 83(1-2): 36-46.
[2]	Teir S, Kuusik R, Fogelhohn C J, et al. Production of magnesium carbonates from serpentinite for long-term storage of CO2［J］. International Journal of Mineral Processing, 2007, 85(1-3): 1-15.
[3]	O'Connor W K, Dahlin D C, Rush G E, et al. Carbon dioxide sequestration by direct mineral carbonation: process mineralogy of feed and products［J］. Minerals & Metallurgical Processing, 2002, 19(2): 95-101.
[4]	Zhao L, Sang L Q, Chen J, et al. Aqueous Carbonation of Natural Brucite: Relevance to CO2 Sequestration［J］. Environmental Science & Technology, 2010, 44(1): 406-411.
[5]	Park A H A, Fan L S. CO2 mineral sequestration: physically activated dissolution of serpentine and pH swing process［J］. Chemical Engineering Science, 2004, 59(22-23): 5241-5247.
[6]	Kodama S, Nishimoto T, Yamamoto N, et al. Development of a new pH-swing CO2 mineralization process with a recyclable reaction solution［J］. Energy, 2008, 33(5):776-784.
[7]	Wang X, Maroto-Valer M M. Dissolution of serpentine using recyclable ammonium salts for CO2 mineral carbonation［J］. Fuel Processing Technology, 2010.
[8]	Yang H Q, Xu Z H, Fan M H, et al. Progress in carbon dioxide separation and capture: A review［J］. Journal of Environmental Sciences-China, 2008, 20(1): 14-27.
[9]	Mathieu P. The IPCC special report on carbon dioxide capture and storage［J］. ECOS 2006: Proceedings of the 19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, Vols 1-3, 2006: 1611-1617.
[10]	Sohn H, Wadsworth M. Rate Processes of Extractive Metallurgy［M］. Plenum Press, 1979, New York. 465.
[11]	Davis JA, Kent D B. Surface Complexation Modeling in Aqueous Geochemistry［J］. Reviews in Mineralogy, 1990, 23: 177-260.
[12]	Ju S H, Tang M T, Yang S H, et al. Dissolution kinetics of smithsonite ore in ammonium chloride solution［J］. Hydrometallurgy, 2005, 80(1-2): 67-74.
[13]	Meng X, Han K. The principles and applications of ammonia leaching of metals—a review［J］. Mineral Processing and Extractive Metallurgy Reviews, 1996, 16 (1): 23–61.
[14]	Demirkiran N, Kunkul A. Dissolution Kinetics of Ulexite Prepared under Different Calcination Temperatures［J］. Brazilian Journal of Chemical Engineering, 2008, 25(4): 751-758.
[15]	朱辰,高雄,赵良.基于二氧化碳封存的水镁石反应动力学研究［J］.第四纪研究,2011:31.
[16]	Ding Z Y, Yin Z L, Hu H P, et al. Dissolution kinetics of zinc silicate (hemimorphite) in ammoniacal solution［J］. Hydrometallurgy, 2010, 104(2): 201-206.
[17]	李作骏, 多相催化反应动力学基础［M］. 北京大学出版社, 1990.
[18]	李作骏,多相催化反应动力学基础［M］.北京大学出版社,1990.
[19]	黄芳,王华,李军旗,等.高镁磷尾矿中磷和镁在硫酸中的溶解动力学［N］.过程工程学报,2009:1121-1126.