碱性长石中的微孔及微裂隙特征研究

Characteristic Research of Micropores and Microcracks in Alkali Feldspar

扫描电镜(SEM)显示长石矿物中存在不同形态的微孔和微裂隙,大小从几十纳米到几十微米不等,其表面形态主要有圆形、椭圆形和槽形。不同类型的长石微孔和微裂隙的分布不均匀,无色透明的长石比较致密,微孔和微裂隙较少;而半透明长石中的微孔和微裂隙较多,孔密度较大。N2吸附实验表明,碱性长石矿物的比表面积为1.833 m2/g;长石矿物的BET吸附等温线为II型,吸附回线类型为H3和H4型回线,表明长石中主要为圆形孔和裂隙形孔。

Scanning Electronic Microscopy （SEC） study showed that there were different kinds of micropores and microcrackes, from tens of nanometers to several tens of millimeters, in the minerals of feldbar. The major surface types of micropores or microerackes in feldspars are round, ellipse and slot. Micropores and microerackes were not homogeneously distributed in the different types of feldbar. Only a small amount of micropores and microcrackes were found in the colorless and transparent feldspar, while a large amount of micropores and mierocrackes were found in the translucent and pink feldspars. The BET analysis using N2 gas showed that the surface area of micropores and microeraekes in alkali feldspar was 1. 833 m2/g, the BET adsorption isotherm of feldbar was type II isotherm with a hysteresis of H3 or H4 type. All of these results indicated that the major types of the micropore existed in feldbar samples were round and crack-like.