Abstract: Objective: the ultra grinding technology of montmorillonite powder grinding, with montmorillonite powder particle size as indexes, for the simultaneous determination of main components of montmorillonite in the aluminum oxide content. Methods: in do not shatter time based on montmorillonite powder of ultra-fine powder, the particle size distribution of detection, and simultaneous detection of three two aluminum oxide content in compliance with the standard. Results: in montmorillonite powder grinding time? S, grinding temperature of 4 degrees centigrade, the particle size distribution in the range, aluminum oxide content. Conclusion: using superfine grinding technology, montmorillonite powder further crushed, there is no change in the content of the main components, to provide a theoretical basis for its application in adsorption force. Key words: ultra fine powder, montmorillonite, particle size, three oxidation two aluminum content determination
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