Grinding mill of vertical roller mill in cement plant

What are the different types of grinding mills?

There are three main types of grinding mills: ball mills, rod mills, and SAG mills. Ball mills are the most common type of mill used in minerals processing plants. They are typically either open circuit or closed circuit. Rod mills are less common than ball mills for grinding minerals. The rods used in the mill, usually a high-carbon steel, can vary in both the length and the diameter. However, the smaller the rods, the larger is the total surface area and hence, the greater the grinding efficiency. SAG mills are primarily used in mining applications for grinding ores before being passed to a secondary crusher such as a ball mill.

How do grinding mills work?

grinding mill is widely used in mining industry, metallurgy, building materials, chemical engineering and other fields. It can be divided into two main types: ball mill and vertical roller mill.

The ball mill is the most common type of grinding mill used in cement plants. It consists of a large cylinder that is filled with steel balls (of different sizes) that act as the grinding media. The cylinder rotates around a horizontal axis, and the material to be ground is fed into the chamber from one end. As the cylinder rotates, the steel balls crush the material, grabbing it and pulling it up against the inner walls of the chamber. The size of the steel balls has a direct effect on the size of the output material; smaller balls produce finer particles while larger ones yield coarser results. The ball mill has a rotating hollow cylindrical shell that revolves about its own axis. This axis is called the axis of rotation or simply ‘the axis’. The cylindrical shell is filled with many small balls made up of iron or steel depending on their application. These balls are called ‘grinding media’. When in operation, this cylindrical shell rotates about its own axis at a particular speed known as ‘critical speed’ which happens to be equal to square root of [(2 x GM)/(R x g)] where GM = Grinding Media weight in kgs; R = Radius of Cylinder in cms; g = Acceleration due to gravity (9.81 m/sec2) The critical speed of ball mill is given by, where R = radius of ball mill; r = radius of ball. For R = 1000 mm and r = 50 mm, nc = 30.7 rpm But the mill is operated at a speed of 15 rpm Therefore, the mill is operated at 100 x 15/30.7 = 48.86 % of critical speed If 100 mm dia balls are replaced by 50 mm dia balls, and the other conditions are remaining same, Speed (RPM) nc = 54.19 rpm.

Vertical Roller Mills

In vertical roller mills, high temperatures can occur if there is no water injected as grinding aid. This causes gypsum dehydration & thus partial or complete loss of setting properties and ultimately strength. To avoid this problem, water injection for temperature control is necessary when using VRMs as raw meal or cement grinding mills usually have fan installed so that fresh air can be supplied to the mill when needed in case of high temperature inside the mill.

What are the benefits of using a grinding mill in a cement plant?

The grinding mill is the key equipment for re-crushing the materials after they are primarily crushed. It is widely used in the cement silicate product new building material refractory material chemical fertilizer black and non-ferrous metal ore-dressing and glass ceramics industry.

vertical roller mill in cement plant has many advantages than other grinding systems such as ball mills or roll presses. The energy efficiency of vertical roller mill in cement plant is very high, and it can save a lot of energy compared with other kinds of grinding systems. In addition, vertical roller mill in cement plant has many other advantages such as less space required, low noise level and low maintenance cost.

What is vertical roller mill?

A vertical roller mill is a type of industrial equipment used to crush or grind materials into small particles. These machines consist of a large, rotating drum that relies on gravity to feed the material through the rotary table underneath. The table is powered by either electric or hydraulic motors, and as the material passes through the table, it is crushed or ground into smaller pieces.

Vertical roller mills are often used in the cement industry because they are very efficient at grinding raw materials into clinker, which is a finely-ground powder that can be used to make cement. This type of mill is also popular in other industries that process materials into fine powders, such as power plants, where large chunks of coal are ground into dust.

Application of vertical roller mill in cement plant

Vertical roller mill is an energy-efficient grinding solution that relies on technology to reduce power consumption. It is a common grinder that is used in many cement plants. As a result, it can help you save on your energy bill every month. In addition, this type of mill is also very versatile and can be used in a variety of other industries, such as the mining and metallurgical sector.

How does it work?

The working principle of the grinding mill is that the material to be ground enters the mill from the feeding side, and is ground by the grinding roller on the inner surface of the grinding disc. Under the action of centrifugal force, it is thrown outwards and crushed by the grinding ring on the outer surface of the grinding disc. At the same time, hot air is blown up from below through the mill, so that The material to be ground is dried and ground at the same time.

Advantages of using a vertical roller mill in cement plant

One of the main advantages of using a vertical roller mill in cement plants is its energy efficiency. By using a VRM, raw materials can be ground more efficiently and with less energy consumption, leading to lower operating costs for the cement plant.

In addition, a VRM can lead to a smaller carbon footprint due to its lower energy consumption. This can be beneficial for both the environment and the company's bottom line.

Another advantage of using a VRM is that it can help improve the quality of the final product. By grinding the raw material more finely, a VRM can help create a more consistent product with fewer unwanted particles.

Overall, using a VRM in a cement plant can offer many benefits, both in terms of energy efficiency and product quality.

Conclusion

In conclusion, the vertical roller mill is a versatile and powerful tool that can be used in a wide variety of applications. From cement plants to power plants, it has proved to be an effective and efficient way to grind raw materials and achieve the desired results. We hope that this article has given you a better understanding of how the vertical roller mill works and how it can be used in your own facility. If you have any further questions, please don't hesitate to contact us.