The followings will make a brief introduction about the performance of the ultrafine mill.
I. low running costs,high grinding efficiency, low power consumption. for example, compared with ball mill, raymond mill,the ultrafine mill can reduce the power consumption by 40-50. grinding roller and disc are made of special wear-resistant welding castings. meanwhile ,the world-class technology can make its lifespan longer and reduce the metal contamination. external cycle apparatus can further reduce the energy consumption and improve the product fineness.
Ii. stable product quality. as raw material will be processed quickly in the lm grinding mill, it will be much easier to test and control the fineness and its elements. the installation of the high-precision classifier can separate the products from 325 mesh to 6000mesh.
Iii. trustworthy security. some other apparatus is fitted to avoid the direct contact of the roller and disc. by doing this, both the lifespan of the roller and disc can be greatly improved.
In the ever-increasing quest for reduced mineral processing costs and increased throughput tonnages, there has been a worldwide move towards larger and larger mill sizes. as such, flsmidth has supplied some of the worlds largest horisontal grinding mills with ball mills up to 28ft in diameter 22mw and sag mills up to 40ft in diameter 28 mw.
V. energy saving and environmental protection ,as well as small vibration and low noise. the whole system uses negative or positive pressure operation, no dust is left,nbsp which meets the national environmental protection requirements.
Vi.low construction costs.the ultrafine mill is integrated with crushing, grinding ,classifying and conveying system.in comparison with ball mill, chile ultrafine mill will take less 50 of the land to install. while the installation fee will be less than 70.
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Ball mills are used primary for single stage fine grinding, regrinding, and as the second stage in two stage grinding circuits. according to the need of customers, ball mill can be either wet or dry designs. ball mills have been designed in standard sizes of the final products between 0.074 mm and 0.4 mm in
Where d b.max is the maximum size of feed mm is compression strength mpa e is modulus of elasticity mpa b is density of material of balls kgm 3 d is inner diameter of the mill body m.. generally, a maximum allowed ball size is situated in the range from d 18 to d24.. the degree of filling the mill with balls also influences productivity of the mill and milling efficiency.
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A variant of this method is to direct pebblecrushing circuit product to the ballmill sump for secondary milling while convenient this has the disadvantage of not controlling the top size of feed to the ballmill circuit there have also been pioneer installations that have
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