Novel technique for preparing high-purity montmorillonite by deeply purifying bentonite

The invention discloses a novel technique for preparing high-purity montmorillonite by deeply purifying bentonite which does not contain cristobalite. According to the novel technique, impurity phases, particularly superfine quartz concomitant with montmorillonite in calcium bentonite can be effectively removed, and furthermore, the components and the structure of prepared high-purity montmorillonite are unchanged. According to the technological idea, firstly montmorillonite and impurity quartz particles are depolymerized by virtue of a certain mechanical force, so that the occurring states of montmorillonite and quartz are changed, and the binding force between montmorillonite and quartz is weakened; secondly, the dispersing difference between montmorillonite and quartz is expanded by virtue of a small amount of dispersing agent, so that the separation is relatively easy; finally, high-yield and high-purity montmorillonite is obtained by virtue of the dispersing difference between montmorillonite and quartz through centrifugal separation. The novel technique has the characteristics of simple process, mild conditions, low equipment requirement, high product additional value and the like.