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Mill (grinding) - Wikipedia

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  • LM Vertical Mill

    LM Vertical Mill

    High drying efficiency, Low running cost, Good environmental effect

    LM Vertical Mill integrates crushing, drying, grinding, classifying and conveying together, and it is specialized in processing non-metallic minerals, pulverized coal and slag. Its coverage area is reduced by 50% compared with ball mill, and the energy consumption is saved by 30%-40% similarly.
    Applications: Cement, coal, power plant desulfurization, metallurgy, chemical industry, non-metallic mineral, construction material, ceramics.


    LM series vertical mill is one advanced mill, adopting top technology domestic and abroad, and based on many years’ mill experiences. It can crush, dry, grind, and classify the materials.

    LM series vertical milling machine can be widely used in such industries as cement, power, metallurgy, chemical industry, non-metallic mineral. It is used to grind granular and powdered materials into powder with required fineness.


    Learn More About Liming® LM Vertical Mill


    1. Low Investment Cost. This mill itself can crush, dry, grinding, classifying, so the system is simple, and occupation area is about 50% of ball mill system. In addition, it can be installed outside, so it will reduce a large number of investment costs.

    2. Low Operation Cost.  ⑴ High efficiency: roller compacted materials directly onto the grinding disc, so power consumption is low. Compared with ball mill, it saves energy consumption by 30% ~ 40%. ⑵ Less wear and tear: As the roller is not in direct contact with the disc, and material of the roller and liner is high quality, so life lime is long.

    3. High Drying Ability.  As the hot air inside contacts directly with the material, drying ability is higher, and it saves energy. By regulating the air temperature, it can meet requirements with different humidity.

    4. Simple and reliable operation.  ⑴ It is equipped with automatic control systems, so remote control makes it easy to operate. ⑵ It is equipped with one device,which prevents the roller from contacting with the liner directly, and avoids the destructive impact and severe vibration.

    5. The stability of product quality.  As the material stays in the mill for a short time, it is easy to detect and control the product particle size and chemical composition, to reduce duplication of milling, stable product quality.

    6. Maintenance convenience.  By repairing fuel tank, rotating the arm, it is fast to replace the roller sleeve, and liner, and reduce the downtime loss.

    7. Environmental protection.  It is with small vibration, low noise, and the overall sealing. The system works under negative pressure, so there is no dust going out. It meets the requirements of the state Environmental Protection.


    Working Principle


    Vertical mill has two pairs of grinding rollers, each pair of roller composed of two narrow rollers, mounted on the same axis and can rotate at different speeds. There are two circular disc slot, and roller to the tire shape, work pressure in the tank. Disc roller and the relative sliding velocity between small and roller can swing, even if the roller sleeve and the disc after the liner wear can guarantee a good abrasive, will not affect the grinding effect. Roller symmetrical structure, one side can be upside down after use and wear. Material grinding process: hydraulic pneumatic roller device through the pressure applied to the material on the crushing of materials, the materials have been moved to crush the edge of disc, from the disc around the nozzle from the exhaust air to improve these materials to Separator.Meal to separate returns after a concentrated mill, fine powder was collected in the precipitator unloading. In the gas flow is small, the meal can not be increased to enhance air flow, they would fall through the nozzle discharged outside the mill, bucket elevator to be transported to the feeder of vertical mill and was re-grinding mill feed people.

    This cycle features of the way there:

    ring by adjusting the air valve, can change the product fineness can shide mill bed load material uniformity and stability, improving the grinding efficiency;
    coarse particles in the external circulation, helps reduce Fan power consumption and overall system power.


    Specifications - Technical Data


    Series Ore Mill
    Model LM130K LM150K LM170K LM190K LM220K LM240K LM280K LM340K LM370K
    Disc Dia. (mm) 1300 1500 1700 1900 2200 2400 2800 3400 3700
    Capacity (t/h) 10~30 13~40 18~57 23~72 36~114 41~128 50~196 70~260 90~320
    Output fineness micron 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45
    mesh 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325
    Product moisture ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1% ≤1%
    Max.input size (mm) <38 <40 <42 <45 <50 <55 <58 <62 <65
    Best input moistrure <4% <4% <4% <4% <4% <4% <4% <4% <4%
    input moistrure(drying required) 4~15% 4~15% 4~15% 4~15% 4~15% 4~15% 4~15% 4~15% 4~15%
    Inlet air temperature (℃) <350 <350 <350 <350 <350 <350 <350 <350 <350
    Outlet air temperature (℃) 70~95 70~95 70~95 70~95 70~95 70~95 70~95 70~95 70~95
    Power (KW) 185~220 250~280 355~400 450~500 710~800 800~900 1120 1800 2240


    1. Material should be with hardness less than 7 in Mohs.
    2. Hot air is only necessary if outlet moisture is required to be less than inlet moisture.
    3.When grinding mateiral that is difficult to grind, please use the largest power.


    Series Coal mill
    Model LM130M LM150M LM170M LM190M LM220M LM240M
    Disc Dia. (mm) 1300 1500 1700 1900 2200 2400
    Capacity (t/h) 10~15 16~22 20~28 26~35 35~45 40~50
    fineness (R0.08) <15% <15% <15% <15% <15% <15%
    Coal powder moisture <1% <1% <1% <1% <1% <1%
    Max.input size (mm) <38 <40 <42 <45 <50 <55
    input moistrure <15% <15% <15% <15% <15% <15%
    Inlet air temperature (℃) <350 <350 <350 <350 <350 <350
    Outlet air temperature (℃) 75~95 75~95 75~95 75~95 75~95 75~95
    Dimension Lmm 3500 4200 4700 8500 10200 11700
    Wmm 3400 3900 4500 5600 6700 7710
    H mm 5800 7100 8300 8800 10600 12200
    Weight (t) 46 75 94 100 122 157



    Series LM for hard materials
    Model LM130N LM150N LM170N LM190N LM220N LM240N LM280N LM340N LM370N
    Disc Dia. (mm) 1300 1500 1700 1900 2200 2400 2800 3400 3700
    Capacity (t/h) 7~11 9~13 11~15 14~20 22~26 27~35 48~55 65~89 90~100
    Output fineness Micron(μm) 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45 170~45
    mesh 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325 80~325
    Moisture of slag ≤12%
    Product Blaine ≥420㎡/kg
    product moisture ≤1%
    Main mill power(kw) 200 280 400 500 800 900 1120 1800 2240


    © Copyright 2004-2017 by China Liming Heavy Industry Science and Technology Co. LTD All rights reserved


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