Vertical Roller Mill VS Ball Mill

Speaking of ball mill, everyone must be familiar with it. As a large-scale mine mill, it is widely used in various industries due to its low price and high production capacity. The device has extremely powerful performance advantages. Do not believe? Let’s take a look together!

1. Structure and installation

The vertical roller mill has a simple structure and adopts vertical vertical installation, which occupies a small area, simple infrastructure, convenient installation, and short time-consuming. The structure of the ball mill is more complicated, and it adopts horizontal and horizontal installation. Large area. Both can be arranged in the open air, but in general, the construction area of ​​the vertical roller mill is 70% of the ball mill, and the building space is 50% -60% of the ball mill, and the investment cost is low.

2.In terms of crushing methods

The vertical roller mill mainly adopts the grinding and crushing method, followed by the impact force. It is suitable for fine grinding and ultrafine grinding. The grinding medium consumption is small and the lining has a long service life. The ball mill mainly adopts the impact crushing method, followed by grinding, which is suitable for rough grinding and fine grinding. The grinding medium consumption is large and the service life of the lining is short.

3. Process flow

The vertical roller mill integrates crushing, drying, grinding, and grading and conveying. Compared to the ball mill, the vertical roller mill has a simple process flow and a small capital investment, which can save a dryer for the mill system. Another vertical roller mill has a separator, which uses hot flue gas to transport the material, and does not require a powder separator and a lifter. The dust containing the outgoing mill is directly fed into the dust collector to collect. Therefore, the vertical roller mill system has a simple process, low failure rate and high operating rate. The layout is compact.

Generally speaking, the finished products of the same fineness adopt the vertical grinding process. After two stages of grinding, the product fineness can reach the requirements. The traditional ball mill process requires three stages of grinding.

4. In terms of energy consumption

The vertical roller mill has fewer moving parts and is of a low energy consumption type with low vibration. All parts of the ball mill are basically in motion and belong to a high energy consumption type with large vibration. In addition, the vertical roller mill uses grinding rollers to directly crush the ground material on the grinding disc, which saves 30% to 40% of energy consumption compared with the ball milling system.

Generally speaking, in the case of the same raw material abrasiveness and product particle size, the power consumption of the vertical roller mill can be reduced by 30% to 50% compared with the energy consumption of the ball mill.

5. In terms of drying capacity

The vertical roller mill is a combination of grinding, classification and drying (when the moisture content of the material is large). It is integrated into one body and uses hot air to transport materials. It can be used when grinding materials with relatively high moisture content (such as coal, slag, etc.). Control the inlet air temperature to make the product reach the final moisture. The vertical roller mill can dry materials with moisture of 12% -15%. The drying ability is strong. Even if it is a ball mill, it can only dry materials with moisture of 3% -4%. . Therefore, the vertical roller mill is used for the production of materials with larger moisture, which not only saves economic costs, but also saves time costs.

6. Material discharge method

The discharge material of the vertical roller mill is forced to avoid over-grinding. After the material is pressed by the grinding roller on the grinding plate, it is taken away by the high-speed air flow of the wind ring at the edge of the grinding plate. The qualified fine powder is collected by the dust collector along with the air flow through the dust collector.

The discharge material of the ball mill is self-discharging, which is prone to over-grinding. Especially for overflow ball mill, its material is automatically overflowed. When the material level is higher than the discharge port, it is automatically discharged, which consumes energy and is easy to over-grind.

7. the quality of the product

  • (1) Compared with the ball mill, the vertical roller mill has a higher degree of homogenization and higher purity. This is because the vertical grinding mill takes a short time to classify the finished powder during work and avoids overgrinding.
  • (2) Due to the unique working principle, during the operation of the vertical roller mill, there is no direct metal contact between each other, metal wear is small, and the pollution to the finished material is small.
  • (3) The vertical roller mill is very convenient to adjust the separator’s speed, wind speed and pressure of the roller, so that the fineness of the product can be adjusted easily. The built-in powder selection device can eliminate fine powder in time, reduce over-milling, and the product particle composition is stable. . ball mill are prone to over-grinding. The unit wear of limestone is generally 4-6 g / ton, and ball mill are up to 500 g / ton.
  • (4) The whiteness of the vertical roller mill when grinding white minerals is much smaller than that of a ball mill.

8. Environmental impact

(1) The vertical roller mill is soft in work, usually around 80dB. The grinding roller is not in direct contact with the grinding disc (installed with a device to prevent direct contact to avoid destructive impact and severe vibration), and the noise is about 20-25 decibels lower than that of the ball mill.

(2) The vertical roller mill adopts an overall seal, and the system operates under negative pressure, with less dust and clean environment. The ball mill is open and there is a problem of dust.

9. Development and application

The process manufacturing technology of the vertical roller mill started late, and the industrial production application is in the promotion stage; the process manufacturing technology of the ball mill is relatively mature, and industrial production has been widely used. But in the future, as the vertical roller mill technology becomes more mature and efficient and environmentally friendly equipment, its application scope will definitely be more extensive.

10. Price and capacity

The popularity of ball mill is not without reason. Among large-scale mill production equipment, ball mill are relatively cheap, with small disposable investment, high production capacity, wide application range, and simple operation. vertical roller mills do not have an advantage in terms of price, but they are equipped with a hydraulic system for convenient and fast maintenance operations.

As an efficient and energy-saving grinding equipment, vertical roller mills are gradually applied to many industries such as slag grinding, cement clinker grinding, power plant desulfurization, phosphate ore grinding, manganese ore grinding and other industries due to their excellent performance. The preferred milling equipment for environmental protection. Today, environmental protection requirements are becoming more and more stringent, and vertical roller mills have become the first choice of international raw material and coal mills.

Relate Project

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