1) Ball mill. The cylinder is a cylindrical or tapered type, and a metal ball is used as a grinding medium. According to the discharge method, it is divided into overflow type and lattice type. Ball mills are widely used in concentrators to mill a variety of ores. 2) Rod mill. The cylinder is a long cylinder type, and the metal rod is used as a grinding medium. Due to the selective grinding effect, the product has a uniform particle size and is mostly used for re-election. 3) The gravel mill is a non-steel medium grinding equipment that grinds the ore by means of gravel or hard rock blocks of various sizes. 4) Self-grinding machine. In the short cylinder, the ore impacts on itself. Grinding and crushing. The ore is both a grinding medium and an abrasive material. In order to improve the self-grinding effect, a small amount (2%-8%) of steel balls is sometimes added to the cylinder, which is called semi-self-grinding. The self-grinding machine has a large pulverization ratio, which greatly simplifies the pulverization process 5) Superfine pulverizing equipment. At present, this kind of equipment is mainly used for deep processing of non-metallic minerals, mainly including mechanical and airflow impact type. The mechanical superfine pulverizing equipment is a kind of pulverized body (hammer head, blade, dent, etc.) that rotates at a high speed to collide with coarse ore particles dispersed in the inner wall of the pulverizing chamber due to centrifugal force, or to give these ore particles a certain line. The speed causes the particles to collide with each other. Such equipment includes vibrating mills, agitating mills, roller mills (Raymond mills), tower mills, colloid mills, centrifugal mills and high pressure (extrusion) disc mills, etc., airflow type ultrafine powder The grinding equipment utilizes a high-pressure airflow (compressed air or superheated steam) to cause the materials to collide with each other and collide with the friction to achieve the pulverization by shearing action. The product size is generally up to 1.0-5.0 um or finer. Such pulverizers have flat flow pulverizers, circulating tube air pulverizers, jet mills, etc. These grinding equipments are mainly used for ultrafine grinding of materials.
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Classification and use of common mills and grinding equipment
The mill generally treats materials with a small particle size, and the product can reach 0.074 mm or finer. It is made of ore particles sandwiched between medium (steel medium or non-metal medium) and is crushed by impact and abrasion. . According to the fineness of the obtained product, it is divided into coarse grinding (1-0.3mm), fine grinding (0.1-0.074mm) and ultrafine (micro) grinding (usually refers to the production of powder materials of 1.0-10.0um or finer). Grinding machines are roughly classified into the following categories according to their uses and characteristics: