| 1 Three-rings micro Mill is an equipment which produce thin powder and super thin powder, be applicable middle and low rigidity.2 It is able to product powder form various non-flammable and non-explosive minerial with Mohs’ hardness below 6.(such as calcite, chalk, limestone, dolomite, kaolin, bentonite, steatite, mica, magnesite, meerschaum, diatomite, barite, gypsum, alunite, graphite, fluorite, floatstone, etc.)Load the material for grinding evenly and continuously into the grinding chamber of the main frame. Due to the centrifugal force in rotation, the roller swings outward and presses closely upon the ring. The shovel carries the material to the space between the roller and ring. When the roller rolls, the material is thus ground.3 After being ground, the material is routed to the sorter along the wind belt of the blower and the coarse powder will be put back to the mill for regrinding. The fine powder flows into the cyclone collector together with airflow and is expelled from the discharge pipe as final product. In the grinding chamber, since the material may contain moisture to some extent, the heat generated during grinding makes the moisture evaporated and the pipeline joints are not airtight, the external air is sucked in and the circulation air amount increases. In order to enable the mill to work under negative pressure, the increased airflow is guided to the deduster anew sequentially to the atmosphere after purification. | 
