Xiang Gao, Rui-tang Guo, Hong-lei Ding, Zhong-yang Luo, Ke-fa Cen
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, PR China.
J Hazard Mater. 2009 Sep 15;168(2-3):1059-64. doi: 10.1016/j.jhazmat.2009.02.156. Epub 2009 Mar 11.
Limestone dissolution rate was measured by a pH-stat method with CO(2) sparging and dissolved sulfite. The dissolution rate of limestone under these conditions was found to be controlled by mass transfer and surface kinetics. As can be seen from the results, in the presence of sulfite, limestone dissolution rate increases with increasing stirring speed, reaction temperature and CO(2) partial pressure. The crystallinity of limestone has a great impact on the dissolution rate: The lower the value of the crystallinity of limestone is, the higher the dissolution rate is. The presence of sulfite promotes the dissolution rate when pH value is below 5.5 but inhibits it when pH value is above 5.5.
采用pH计法并通过鼓入二氧化碳和溶解亚硫酸盐来测定石灰石的溶解速率。发现在这些条件下石灰石的溶解速率受传质和表面动力学控制。从结果可以看出，在亚硫酸盐存在的情况下，石灰石的溶解速率随搅拌速度、反应温度和二氧化碳分压的增加而增加。石灰石的结晶度对溶解速率有很大影响：石灰石结晶度值越低，溶解速率越高。当pH值低于5.5时，亚硫酸盐的存在促进溶解速率，而当pH值高于5.5时则抑制溶解速率。
