Coal Ball Mill

Coal ball mill is the equipment used for grinding and drying coal with different hardness. It is mainly composed of feeding device, principal axis, rotating part, transmission part, discharging part, high-pressure starting device and lubrication system. It also widely used to break various hardness of coal in cement industry, metallurgy industry and chemical industry and so on.

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  • It is an efficient tool for grinding coal into fine powder.
  • The capacity and fineness can change with the diameter of the ball.
  • Low speed driving unit with lifting device, convenient for maintenance.
  • Increase vulnerable parts’ life with new endurable wearing parts.

Product Introduction

Coal ball mill is a machine that crushes and grinds the coal briquette into pulverized coal. It is important auxiliary equipment of pulverized coal furnace. During the coal grinding process, the coal is crushed and its superficial area increases continually. To add new superficial area, the bond between solid molecules must be overcome, so the energy is consumed. The coal is grinded into pulverized coal in the coal mill mainly by means of three ways: press, strike and grind. Among them, the first way is the most energy-saving, and the last one most energy-consuming. During the milling process, all kinds of coal mills use two or three of these ways.

Compared with ball mills with the same specification, the yield of coal mill increases drastically, and the finished product is fine, achieving the high-yield and super-fine goal. It provides a new kind of grinding equipment to produce high-quality pulverized coal.

coal ball mill Structure characteristics:

1.The sealing elements between the feeding apparatus and rotary part, the discharging device and rotary part can prevent the powder from leaking.

2.The cooling water moves in the interior of main bearing to cool the bearing bush and abate its temperature.

3.The heat cover on the exterior of cylinder of the mill is not only heat retaining, but also is sound-proofing.

4.The tooth surface of the reducer is medium-hard or hard, so the reducer has good bearing capacity, long life time and light weight.

Coal ball mill working principle:

Feeding equipment sends the raw coal into louver scraper-trough conveyer of feeding apparatus. While the materials slipping down,the hot-blast air about 300℃ also enters the mill through the blast pipe and stove the raw coal. By means of the kinetic energy while slipping down, the raw coal enters the drying storehouse through the hollow shaft, and then enters the second cabin through the partition after being fully stoved. In the second cabin, there are a certain number of grinding media. Due to the rotation of cylinder, the classifying liner brings the grinding media to a certain height. Taking advantage of the impact energy and frictional energy while falling down, they crush and grind the raw coal. At the same time, the special ventilator sucks the grinded powder and the used hot-blast air out of the mill from its discharging device. The special separator separates the unqualified coarse power from the mixture of fine power and hot-blast air, and sends it back to the mill to grind again. The qualified fine powder and hot-blast air is sent into the rotoclone collector and separate here.


ball mill structure01_77.jpg


Technical parameters:

Model (m) Output (t/h) Rotate Speed (r/min) Grinding Media Load (t) Effective Volume (m³) Motor (kW) Gearbox Weight (t)
Φ2.4×4.75 12 20.4 22 19.3 280 ZD60 50
Φ2.4×4.5+2.0 12 20.4 22.6 18.3 280 JD450 70.1
Φ2.8×5.75+2.25 18-20 18.7 38 32.9 500 MBY630 116.5
Φ2.9×4.1 16 18.8 35 27.1 475 JDX560 74
Φ3.0×6.5+2.5 20 18.4 46.5 43.3 710 JDX630 119
Φ3.2×6.5+2.5 28 18 65 67 710 JDX800 MBY800 153
Φ3.4×6.0+3.0 30 17.47 60 64 900 JDX800 167
Φ3.4×7.5+1.5 30-38 17.5 70 64.1 800 JDX710 160
Φ3.6×6.5+2.5 32 17 60 69 1000 MBY800 203
Φ3.8×70+2.5 38 16.4 80 75 1250 MBY710 216

Application case:

1. Vietnam CAC Corporation Φ2.4×4.75m coal mill

2. Xuzhou Longshan Cement Plant 5000t/d production line Φ3.8×9.5m coal mill

3. Henan Meng Electric Group Cement Co., LTD 5000t/d production line Φ3.8×9.5m wind swept coal mill

4. Riverside Group Co.,LTD 3000t/d production line Φ3.4×6+3m coal mill

Coal ball mill is the equipment used for grinding and drying coal with different hardness,widely be used in Cement Plant, Clinker Grinding Unit, Thermal Power Plant.

Pre-sales Service:

The wide product range enables us to provide our customers with stand-alone machines or complete processing plants. Based on our customers’ request and budget, our experts make efficient, reliable solutions. Following customers’ order we produce strictly, what’s more, before placing the order every customer has the chance to visit XinXiang Great Wall (Chaeng) working machines or complete plant in the site.

To ease the trip for every visitor to China, in particular the first-time visitor, we provide FOR FREE all relevant visitor-friendly services including invitation letter preparation, hotel reservation, airport pick-up, incity transportation, and sightseeing guide, etc.


After-sales Service:

Experienced technicians guidance is available on the phone, and on the internet. One or more engineers will be dispatched to the quarry site to help install the customers’ plants. Necessary training about machine daily maintenance to local workers is provided also.

After-Sales department is made of well-trained employees and installation engineers, the installation engineers are special and professional members of XinXiang Great Wall (Chaeng), they are now strategically located home and abroad, working for our customers.


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