https://www.sciencedirect.com/search?qs=fine%20particle%20ball%20milling%20process&show=25&sortBy=relevance

Hi Ardalan,

probably you will have no "real" milling but only de-agglomeration as your agate milling balls are actually much softer than the material you want o mill and have a low density and therefore low impact. Moreover you will produce a lot of silica debris which may contaminate your sample.

@ Md. Washim Akram

thanks for your references, I didnt find ball size in your first reference.

Thanks