The invention relates to the devices for dry and wet fine and ultrafine grinding in a wide range of materials, including organic and cellulose-containing, in a mill and can be used in powder metallurgy, radiochemical, medical, agricultural and other industries.The mill has a body having oppositely charge and discharge pipes. The rotor in form of a disc with grinding elements, mounted on a drive shaft within the body with clearance relative to its lateral surface. The body is freely oriented in the diametric plane of the axis of rotation of the rotor with the possibility of its fixing in the shifted position. The rotor from the side of discharge pipe has blades that perform the functions of the classifier. The charge pipe is equipped with a device to control a supply of air or water to the central part of the rotor.