石灰活性度的测定及其影响因素研究——以内蒙古清水河地区为例

Determination of lime activity and its influencing factors:taking Qingshuihe area in inner Mongolia as an example

本文通过对内蒙古清水河地区石灰岩的石灰活性度测定及影响因素研究发现:在生产活性石灰的煅烧过程中,其预热时间、预热及煅烧温度影响石灰石中CaCO3的分解程度,从而决定石灰活性度的高低。石灰活性度测定的最佳工艺参数为:活性石灰煅烧的最佳预热时间为45 min,最佳预热温度为800℃左右,而最佳煅烧温度为1 100℃。此外,寒武系凤山组与奥陶系马家沟组地层中石灰石的石灰活性明显优于寒武系张夏组地层,其原因为石灰岩形成的地质年代越晚,存在的微晶结构越多,结构越疏松,比表面越大,可提供更多的反应面积。

The activity of limestone collected from Qingshuihe area in Inner Mongolia was determined and their influencing factors were studied. The results showed that the activity of lime was determined by degree of decomposition influenced by preheating time, preheating temperature and calcining tem- perature. The optimum technological parameters of determination of lime activity are as follow： the optimum preheating time was 45 min, the optimum preheating temperature was about 800~C, and the optimum calcining temperature was 1 100~C. Besides, the lime activity of limestone from Fengshan Formation was better than Majiagou FormationS. Its reason was closely related with high special sur- face of limestone with loose microcrystalline structure in old strata, which has high reaction area.