一、引言 膨润土的一系列重要物理化学性质、使用性能(例如铸造生产中型砂的工艺性能、石油钻井泥浆等)主要由膨润土中的蒙脱石矿物含量所决定。有人通过试验证明,膨润土中的蒙脱石含量与型砂的湿压强度呈正相关关系。所以,除了鉴别膨润土的类型是属于钙基或是钠基等外,一个评阶膨润 I. INTRODUCTION A series of important physico-chemical properties of bentonite, service properties (such as the performance of foundry-produced sand, oil drilling mud, etc.) are mainly determined by the montmorillonite content of bentonite. It was proved through experiments that the montmorillonite content in bentonite was positively correlated with the wet compressive strength of sand. Therefore, in addition to identify the type of bentonite is a calcium-based or sodium-based, etc., a rating swelling