Appliable materials of micro powder grinding mill. Ultrafine grinding mill machine is mainly used to process the non-flammable and explosive minerals that Mohs hardness is below 9.3, and humidity is less than 7%, such as sand, quartz, feldspar, calcite, limestone, talc, ceramic, marble, granite, dolomite, bauxite, iron ore, barite, bentonite, coal gangue, coal, …