ultrafine grinding machine 10 07 2020· Ultrafine Grinding Mill Ultra Fine Grinder Ultrafine The grinding range of the ultrafine mill is a variety of non flammable and explosive mineral materials such as quartz feldspar porcelain clay clay bentonite calcite barite fluorite ball clay white mud gypsum and so on the Moh s hardness of which is below 7 level and the humidity of which is below 6%