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Ball mill is the vital equipment for recrushing after being crushed.
Applied material:cement, silicate, new-type building material, refractory material, fertilizer, ore dressing of ferrous metal and non-ferrous metal, glass ceramics, etc.
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We know ball mill is a piece of equipment for grinding mills materials, and it's widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass ceramics, etc. as well as for ore dressing of both ferrous and non-ferrous metals. The ball mill can grind various ores and other materials either wet or dry. There are two kinds of ball mill, grate type and overfall type due to different ways of discharging material. There are many types of grinding media suitable for use in a ball mill, each material having its own specific properties and advantages. Key properties of grinding media are size, density, hardness, and composition.
A ball mill is a type of grinder used to grind materials into extremely fine powder for use in mineral dressing processes, paints, pyrotechnics, ceramics and selective laser sintering.and works on the principle of impact: size reduction is done by impact as the balls drop from near the top of the shell.
The longer a ball mill operates, the smaller the particles will become. They will even reach the sub-micron level if the mill is allowed to run long enough. Always use as little material in the barrel as possible for maximum grinding efficiency. The more of your material you place in the barrel, the more it will cushion the impact of the media, reducing the grinding action. Several small capacity runs are much better than one long run with your barrel packed to capacity with the material you want to powder.
Ball milling boasts several advantages over other systems: the cost of installation, power and grinding medium is low; it is suitable for both batch and continuous operation, similarly it is suitable for open as well as closed circuit grinding and is applicable for materials of all degrees of hardness
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Advantages: ① has the lowest flow resistance (actually 0); ② is not stuck when working (in the absence of lubricant) Therefore, it can be applied reliably in corrosive medium and low boiling liquid, and the ③ can be fully sealed in the range of pressure and temperature, the ④ can realize the rapid opening and closing, and the open and close time of some structures is only 0.05~0.1s, To ensure that it can be used in the automation system of the test bed. Fast opening and closing valve, the operation without impact. The ⑤ spherical closed parts can be positioned automatically at the boundary position, and the ⑥ working medium is sealed reliably on both sides; ⑦ the sealing surface of the ball and the seat is separated from the medium in full open and closed, so the medium with high speed through the valve will not cause the erosion of the sealing surface; ⑧ Compact and lightweight It is considered that it is the most reasonable valve structure for cryogenic medium system, the ⑨ valve body symmetry, especially the welded valve body structure, can withstand the stress from the piping well, and the ⑩ close part can withstand the high pressure difference when it closes. ⑾ fully welded valve body ball valve, can be buried directly in the ground, so that the valve is not immersed in the corrosion, the maximum service life of up to 30 years, oil, natural gas pipeline is the most ideal valve
Disadvantage: ① because the ball valve is the most important valve seat sealing material is PTFE, it is inert to almost all chemical substances, and has a small friction coefficient, stable performance, not easy to aging, wide range of temperature application and excellent sealing performance of the comprehensive characteristics. However, the physical properties of PTFE, including higher coefficient of expansion, sensitivity to cold flow and poor heat conductivity, require that the design of the seat seals be carried out around these characteristics. Therefore, when the sealing material hardens, the reliability of the seal is damaged. Moreover, the temperature resistance of PTFE is lower and can only be used in less than 180 ℃. More than this temperature, the sealing material will be aging. And considering the long-term use of the case, generally will only be used in 120 ℃. ② its adjustment performance relative to the cut-off valve to some, especially the pneumatic valve (or electric valve)
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