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提出了一种新的蒙脱石重液分离方法，蒙脱石在正辛胺水溶液中浸过后，密度降至１．６０×１０３ｋｇ／ｍ３以下，可用ＣＣｌ４作重液实现与其它粘土矿物及杂质的分离。用７．５ｍｏｌ／ＬＮａＯＨ溶液处理此含有正辛胺的蒙脱石，可得纯度很高的钠蒙脱石。用此法进行蒙脱石定量分析，所得结果与国际铸造协会推荐的溴仿酒精重液法相符合，且成本低、操作方便、污染小。
A new montmorillonite heavy liquid separation method was proposed. After the montmorillonite was immersed in n-octylamine aqueous solution, the density decreased to below 1.60 × 103kg / m3, and CCl4 was used as heavy liquid to achieve the reaction with other clay minerals and impurities The separation. Treatment of this montmorillonite containing n-octylamine with a 7.5 mol / L NaOH solution gave sodium montmorillonite of high purity. The method was used for the quantitative analysis of montmorillonite, and the results were in accordance with the bromoform-simulated alcohol heavy liquor method recommended by the International Foundry Association. The method has the advantages of low cost, convenient operation and low pollution.