Different materials are used as media, including ceramic balls, flint pebbles and stainless steel balls. An internal cascading effect reduces the material to a fine powder. Industrial ball mills can operate continuously, fed at one end and discharged at the other end. Large to medium-sized ball mill are mechanically rotated on their axis, but small ones normally consist of a cylindrical capped container that sits on two drive shafts (pulleys and belts are used to transmit rotary motion). A rock tumbler functions on the same principle. Ball mills are also used in pyrotechnics and the manufacture of black powder, but cannot be used in the preparation of some pyrotechnic mixtures such as flash powder because of their sensitivity to impact. High-quality ball mills are potentially expensive and can grind mixture particles to as small as 5 nm, enormously increasing surface area and reaction rates.
The Ball Millis a horizontal rotary drum apparatus driving by gears outside. It is a lattice pattern with two storage cells. The raw materials enter into the first cell of the Ball Millevenly through the quill shaft in charging part.
ball mill – grinidng mill
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Since in 1880 in industrial production ceramic grinding materials used since the ball more than 100 years history, despite a few advanced countries due to material technology development and only used in ceramic production only plays the ball mill ingredients (mixed), but most of the countries in ceramic production is widely used for grinding mill with mixed casting glaze ceramic raw materials, and paints. However, the efficiency of the ceramic production of ball mill is lower — about 1 %, so that a large amount of energy consumption. According to statistics, ceramic production in about 40 percent of the energy consumption in the ball grinding process. The ball mill process of material of particle shape and size distribution, the fineness, physical and chemical properties, production efficiency has important influence, this paper will be of ball mill process of related problems were discussed. The superficial
2 、the crushing mechanism of materials
Material in the ball mill process is shattered due to its body and abrasive abrasive results. However, the grinding process is extremely complex. If a single particles as research object, the ball mill process it may repeatedly by grinding compressive stress, which exists in the role of the particles on the surface of a new generation of inherent or expansion crack, and lead to its broken or plastic deformation. When the particles are constantly shattered. A certain level of new particles can be further ground, because the new particles on the surface of the crack, and appear a certain minimum fracture risk of crack stress reduced ACTS. When breaking process continues, the final for crushing stress could increase to make granules of plastic deformation degree. Now, with the plastic deformation, particle size is the will. Thus, when the materials are a grinding size limit. For raw materials, quartz can be ground for 1 micron in size limit, and as the extremum, limestone for 3 ~ 5 micron. That is, when the grinding materials into the scope of ultra-fine grinding mill, the effect was more difficult. In most of the grinding system has a real grind limit, this limit the main on grinding particles produced products, and the tendency to accumulate accumulate and broken up between the physical balance. Therefore, a long ball grinding extended time is meaningless, only leads to increased energy, because the meticulous grain can effectively storage needed to crack expansion of elastic energy.
The actual grinding process than the above discussion, the situation is much more complex particle surface crack expanding and new crack appear because each particle interaction among cracks, the sub-tissue particles interact with the wall, the function, the secondary role between particles and the effect with abrasive particles, particle physics and chemistry of the smell of particles and abrasive environments and aggravate, particle breaking. But, for the recognition of the essence of the visual sense or only on the basis of reasoning.
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