• 09 Aug, 2022
• By EPIC Powder
• 2 Comments

Ceramic-Lined Jet Mill

Some materials may adhere during the crushing process because of their special material properties, resulting in blocking or agglomeration, which brings considerable trouble to the crushing work. After long-term experience accumulation and continuous innovation and improvement, the ceramic-lined jet mill is specially launched for the phenomenon of material adhesion.
The fluidized bed air flow crusher, which uses high hardness engineering ceramics to make all flow passage parts, is an ideal crushing equipment for crushing high hardness brittle materials, elastic-plastic materials, condensed materials, fibrous materials, such as zircon, alumina, rutile titanium dioxide, zirconia, talc, kaolin, graphite, coatings, pesticides, chemical fertilizers, pollen, food raw materials, etc. The ceramic-lined jet mill has the advantages of the general Fluidized Bed Jet Mills. What’s more, because the lining of the machine is made of high-strength wear-resistant and high-temperature engineering ceramics, it can not only adapt to the high-temperature superheated steam working medium up to 400℃, but also has no pollution to the crushed materials, thus it is the necessary equipment for high-quality ultra-fine pulverization; At the same time, the cost of airflow superfine grinding is mainly the cost of grinding working medium, while the cost of superheated steam working medium is reduced by one quarter compared with that of compressed air. In addition, the superheated steam working medium will not generate static electricity, wall sticking phenomenon will not occur. Therefore, it is suitable for crushing some materials that will stick to the wall with compressed air at room temperature, such as the production of titanium dioxide.
The ceramic-lined jet mill is mainly composed of a feeding device, a crushing chamber, a discharge outlet, a steam distribution pipe and a nozzle. The feeding nozzle and pulverizing nozzle are made of high-strength, wear-resistant and high-temperature resistant special alloy, and the nozzle structure is supersonic design; The lining of other flow passage parts is made of high-strength wear-resistant and high-temperature resistant engineering ceramics, of which the feed venturi, ceramic middle ring, outlet lining, ceramic upper cover and ceramic lower cover are made of high-strength reaction sintered silicon carbide; Parts such as steam distribution pipe and main engine casing are made of stainless steel and polished, making the whole machine appearance beautiful and compact. The ceramic-lined jet mill can be used together with the Air Classifier. According to the physical characteristics of materials and the purity requirements of finished products, lining ceramic tiles inside the equipment to increase the wear resistance, reduce the impact of materials on the equipment, increase the service life of the equipment, and accurately control the iron content of materials in the process of crushing and classification, successfully solved a series of problems such as the adhesion of battery materials, poor fineness and inaccurate classification.
Working principle of ceramic-lined jet mill: after filtering and drying, compressed air is sprayed into the crushing chamber at high speed through Laval nozzle, and materials are crushed by repeatedly collision and friction at the intersection of high-pressure air flow. The crushed coarse and fine mixture reaches the classification area under the action of negative pressure fan, and the coarse and fine materials are separated under the action of strong centrifugal force generated by the high-speed rotating classification turbo, The materials meeting the particle size requirements enter the cyclone separator and dust collector for collection through the classifying wheel, and the coarse particles fall to the crushing area for further crushing.
 
Ceramic lined jet mill has the following performance advantages:

1. It is suitable for dry grinding of various materials with Mohs hardness below 9, especially suitable for high hardness, high purity and high value-added materials.
2. The breakthrough of particle acceleration technology has greatly improved the crushing efficiency and reduced energy consumption. The over crushing is small, the particle shape is good, the particle size distribution is narrow and there are no large particles, and the product particle size is arbitrarily adjusted between d97=3-74 microns.
3. In the process of crushing, the temperature of air flow is reduced due to the rapid expansion of air flow, which is especially suitable for the crushing of heat sensitive, low melting point and volatile materials.
4. The materials collide with each other for crushing, which is different from the mechanical crushing, which relies on the impact crushing of the materials by the blade or hammer, plus the all-round ceramic lining, so the equipment wear is small and the product purity is high.
5. It can be used in series with multi-grade Air Classifier to produce products with multiple particle size segment at one time.
6. The ceramic lined jet mill is compact in structure, easy to disassemble and clean, and the inner wall is smooth without dead ends.
7. The whole system operates under full negative pressure and airtight, with no dust and low noise, and the production process is clean and environmental-friendly.