The ball mill is a type of grinding equipment that further pulverizes the preliminarily crushed raw material. It uses a certain number of steel balls in the cylinder as grinding media to grind materials, hence its name. Ball mill grinders are widely used in various industries, such as cement factories, glass factories, ceramic factories, fertilizer factories, etc.
The liner is an important part of the ball mill and one of the wearing parts. It is mainly used to protect the casing and rotating parts as well as improve the service life and performance of the ball mill. Ball mill liners are generally made of wear-resistant, corrosion-resistant, high-strength materials. Commonly used materials include cast steel, alloy steel, high manganese steel, ceramics, rubber, etc. The choice of liner is ultimately determined by the grinding material, process requirements, and other factors.
The Function & Importance Of Ball Mill Liner Plate
Protect the cylinder and enhance rigidity: the ball mill lining can effectively prevent the cylinder and rotating parts from direct contact with the grinding media and materials to reduce wear and corrosion, extend service life, and reduce maintenance and replacement costs. In addition, the lining plate and the cylinder are closely combined, which enhances the rigidity of the cylinder and improves the performance of the ball mill.
Adjust the movement state of the grinding media: the lining plate enables the energy obtained by the grinding media to be rationally utilized during the operation of the ball mill. We can use lining plates of different shapes to adjust the movement state of the grinding media to enhance the grinding effect, thereby improving the grinding efficiency of the ball mill, increasing output, and reducing metal consumption.
Automatic grading of grinding media: the main feature of graded liners is that they have a certain slope along the axial direction. The shape of this type of liner allows the large-diameter grinding media to remain at the feed end of the ball mill and the small-diameter grinding media to collect at the discharge end. In this way, the grinding media can be automatically arranged from large to small along the axial direction of the ball mill, that is, automatic grading, which meets the needs of the material grinding process.
Types Of Ball Mill Liners
Cast steel lining: thecast steel lining plate is the most widely used lining plate in ball mills. It has the advantages of wear resistance, corrosion resistance, high strength, etc., and is suitable for grinding various ores and non-metallic minerals. However, it cannot be used to grind chemicals, nor is it suitable for working environments with high humidity, which is prone to rust.
Alloy steel lining: alloy steel lining plates are made by adding alloy elements to cast steel lining plates, thereby improving the hardness and wear resistance. It is suitable for grinding ores and minerals with higher hardness. However, its price is relatively high and it is not suitable for production occasions with low economic efficiency requirements.
High manganese steel lining: thehigh manganese steel lining plate has extremely high wear resistance, impact resistance, and toughness, and is suitable for grinding ores with high hardness and large impact. Its impact resistance can be further optimized from the original surface hardness of HRC20~HRC25 to over HRC40, and the impact resistance value can reach 700Nm/cm2. The total life of a high manganese steel lining plate is about 5000-6000 hours, and it is mostly used in medium and small ball mills.
Ceramic lining: ceramic lining plates have excellent wear resistance, corrosion resistance, and insulation properties, and are suitable for grinding hard and corrosive ores and minerals.
Rubber lining: the rubber lining has a wear resistance of up to 128%, a rebound of up to 80%, a tensile strength of up to 23.5MP, and a tear strength of up to 168N/mm. It is light in weight and has good resilience, fatigue resistance, chemical corrosion resistance, and shock absorption and noise reduction properties. It is mostly used for grinding ores with low hardness and working environments with high humidity. However, it is not resistant to high temperatures and is prone to aging and deformation
High chromium cast iron lining: the wear resistance of high chromium cast iron lining plate is more than 2 times higher than that of high manganese steel lining plate. Besides, it also has excellent high-temperature resistance and corrosion resistance, but its toughness and crack resistance are worse than those of high manganese steel lining and medium and high carbon alloy lining. And the price is expensive.
How To Select The Ball Mill Lining?
The selection of ball mill lining will directly affect grinding efficiency, grinding quality, and production cost. Therefore, how to choose the right ball mill lining is very important.
Grinding material: based on different grinding materials and production environments, we need to choose different materials for lining plates to meet the long-term and high-quality grinding effect.
Production cost: the price of the lining plate will affect the production cost, so we should choose the lining plate with an appropriate price based on the economic benefits.
Material cost: choosing wear-resistant materials with good quality and advanced technology can increase the service life of the lining plate, improve production efficiency, and reduce the number of replacement and maintenance times.
Lining shape: according to the requirements of different production processes, we can choose lining plates of different shapes to achieve high efficiency and expected grinding effects.