中文摘要：

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。

英文摘要：

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 5 mol/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 129.56 kJ/mol in the test.