Montmorillonite is a layered mineral composed of extremely fine-grained hydrous aluminosilicates, and its name comes from Montmorillon, France, where it was first discovered. The montmorillonite subfamily belongs to one of the smectite group minerals and is an important clay mineral, generally in the form of lumps or soils. Molecular formula (Na,Ca)0.33(Al,Mg)2[Si4O10](OH)2·nH2O, the middle is aluminum-oxygen octahedron, and the upper and lower are three-layer sheet-like clay minerals composed of silicon-oxygen tetrahedron. The interlayer contains water and some exchange cations, has a high ion exchange capacity, and has a high water absorption and swelling capacity. Montmorillonite crystals are monoclinic aqueous layered silicate minerals.

Montmorillonite is the main component of Bentonite Desiccat minerals. Bentonite ore can be purified to obtain high-purity montmorillonite. In order to distinguish bentonite, industrial montmorillonite has added another definition. In bentonite raw ore, when the content of silicon montmorillonite is more than 80%, it is called montmorillonite. The raw material of montmorillonite desiccant is obtained after the natural bentonite ore is purified, crushed, dried, screened and other physical processing procedures.

But not all Bentonite Desiccat is suitable for the purification and processing of montmorillonite. The grade of montmorillonite in some bentonite origins is very low and there is no need for finishing; It exceeds the standard in terms of toxic and harmful elements; the montmorillonite of bentonite in some origins is even accompanied by cristobalite carcinogens that are difficult to separate; the harmless bentonite ore is the basis for the processing of high-purity montmorillonite. Therefore, the Bentonite Desiccat and the montmorillonite desiccant in the current desiccant market are not much different in composition, the difference is only the purity of the montmorillonite.