Analysis of Principle and Characteristics of Quartz Ultrafine Jet Mill
Quartz sand is an important industrial mineral raw material, widely used in glass, casting, ceramics and refractory materials, metallurgy, construction, chemical industry, plastics, rubber, abrasives and other industries. Quartz sand is a kind of quartz particles produced by crushing quartz stone, which is a difficult raw material to process in non-metallic minerals. The strong representative material in mineral crushing is quartz, which has a density of 2.6g/cm3 and a Mohs hardness of 6.5-7.5, which is a natural high-hardness and wear-resistant material. Quartz sand grinding requires low iron content, good grain shape, concentrated particle size, less fine powder, and no dust flying. It is a relatively difficult raw material to process in non-metallic minerals.
The ultra-fine jet mill is a compressed air that is frozen, filtered and dried, and then forms a supersonic airflow through the nozzles to be injected into the grinding chamber to fluidize the material. The accelerated material merges at the intersection of the jet airflows of several nozzles to produce Violent collision, friction, and shearing can achieve ultra-fine pulverization of particles. The pulverized material is transported to the impeller classification area by the rising airflow. Under the action of the centrifugal force of the grading wheel and the suction force of the fan, the coarse and fine powder are separated. The airflow enters the cyclone collector, the fine dust is collected by the bag filter, and the purified gas is discharged by the induced draft fan.
Features of superfine jet mill:
(1) This machine is the latest combination of fluidized bed and high-precision vertical turbine classifier.
(2) High efficiency: The full use of jet energy greatly improves the crushing efficiency.
(3) Low abrasion: “Fluidized bed + vertical turbine classifier” can process ultra-fine powder with high purity and ultra-narrow, avoiding the abrasion of the crushing part of the “spray + vertical classifier” and “fluidization” Wear of the “bed + horizontal classifier” classification part. Under the same material, the service life of equipment wearing parts is equivalent to 8 times that of similar international products.
(4) High classification accuracy: stable and complete classification flow field and special sealing measures can effectively avoid the leakage of coarse particles. The vertical turbine classifier and the fluidized bed form an internal circulation to ensure the qualified product particle size d97=2 -74µm.
(5) Less over-crushing: The unique classification flow field reduces the gas-solid concentration in the classification zone and avoids over-crushing.
(6) Variable combination structure: It can be used as a machine for two purposes. It can be used as a crushing classifier or a separate classifier.
(7) Fully enclosed negative pressure operation, no dust pollution, dust removal rate above 99.9%.
(8) The equipment is easy to operate and maintain, easy to disassemble and wash, and has low noise.
(9) The equipment has particle shape control technology, which can maintain the material characteristics.
Jet mills are also widely used in ultra-fine grinding of low-temperature, high-purity and high-hardness dry materials such as chemicals, abrasives, ceramics, environmental protection, new materials, new energy, non-metallic minerals, medicine and food, powder metallurgy, battery materials, etc.