Alumina Chute Wear Liners Industrial Ceramic Composite Liner Rubber

​Product Description

The ceramic composite liner of the vertical coal mill is used to protect the cylinder and the casing of the coal mill, so that the cylinder is free from the impact and friction of abrasives and soot gas, and improves the crushing effect of abrasives on materials, which is conducive to improving the cutting of abrasives Efficiency, increase output and reduce metal material consumption.

​The ceramic composite liner of the coal mill can be installed on-site, or the wear-resistant ceramic composite liner can be installed on the curved steel plate in the factory first, then welded to the mill shell.

​Principle of coal mill wear

The medium-speed coal mill refers to the machine whose working speed ranges from 50 to 300r/min. Generally speaking, the temperature of the inlet and outlet of the medium-speed coal mill is between 100 and 120°C. The material moves in the internal structure of the coal mill, with continuous friction, erosion, and impact, and the wear and tear of the machine body are inevitable.

​The factors for the wear of the coal mill barrel are relatively complex, including abrasive particle wear caused by the rolling of coarse and fine particle materials, wind erosion landform wear caused by the rapid erosion of high-concentration soot gas, coarse and fine particle materials and even abrasives crushed by ball mills, etc. Impact wear due to impact.

​The role of vertical coal mill liner

The area within 2 meters above the grinding plate is severely scoured, and there are large particles of material impacted. It is recommended to choose a cemented ceramic composite liner. This product is made with a unique process and has the characteristics of high strength and good ductility. Fixed, especially suitable for places with high temperature and high impact.

​Alumina ceramic technical parameters

Rubber technical parameters

Comparative analysis of several common wear-resistant materials for coal mills

High manganese steel: high manganese steel is mainly used for working conditions with high impact. It is more wear-resistant when the impact force of the material is large. The impact force of the coal mill is relatively small. Now few manufacturers choose this material.

​High chromium cast iron: High chromium cast iron has much stronger toughness, high-temperature strength, heat resistance, and wear resistance than ordinary cast iron, but the cost is relatively high, the welding and cutting performance is poor, and the brittleness is high. It has certain processing difficulties and is not recommended as a coal mill. Liner use.

​Alloy: After quenching, the hardness of the alloy liner can reach above HRA65, and the impact toughness is strong. Stable performance, easy installation and use, and average wear resistance.

​Medium chromium steel: medium chromium steel refers to the alloy steel containing chromium, and at the same time, elements such as molybdenum and nickel are added. Chromium can increase the hardenability of steel, improve the strength and wear resistance of steel, and chromium steel is easy to whiten after forging Point, after carburizing, low-carbon chromium steel has a higher carbon concentration in the surface layer, is more brittle, and has higher wear resistance than alloy materials, but has poor weldability, high welding difficulty, and difficult installation.

​Wear-resistant ceramics: Wear-resistant ceramics have been highly recognized by customers because of their super wear resistance. The hardness can reach HRA88-HRA90, and the wear resistance far exceeds the above metal wear-resistant materials. For the impact wear of coal mills, we can increase the thickness of alumina ceramics to solve this problem. The service life is 10-20 times that of metal wear-resistant linings. Based on the above comparisons, wear-resistant ceramic linings are the most cost-effective anti-wear solution.

​Anti-wear scheme of coal mill barrel

At the bottom of the barrel of the medium-speed coal mill, the impact of the material extruded by the grinding roller and the erosion of the high-temperature and high-concentration powder is very serious.

According to the operation characteristics of the coal mill, we have designed different anti-wear design schemes, which can completely solve the anti-wear problem of medium-speed mills.

​Coal mill barrel: the bottom of the barrel has high particle concentration, fast flow rate, strong scouring force, high temperature, high wear, and strong material scouring and collision force. It is recommended to use wear-resistant ceramic liners with dovetail slots. The liner is to fix the dovetail-shaped ceramics to the arc-shaped steel plate, which is double fixed by dovetail strips and welding and is made into a ceramic + steel plate two-in-one ceramic liner. It is fixed to the wall of the medium-speed grinding cylinder in a fixed way to form a protective layer of wear resistance, high-temperature resistance, and impact resistance.

The surface of the wear-resistant ceramic liner of the dovetail card slot is smooth and impact-resistant and has a strong mechanical self-locking force, which effectively prevents the ceramic from falling off. The staggered installation reduces the impact of high-velocity powder and airflow on the liner of the vertical mill cylinder. Erosion wear.

​Coal pulverizer casing: The impact force of the casing is small under normal temperature operation. We use direct-bonded ceramic lining plates with a thickness of 5mm-10mm. The ceramic adopts the dislocation bonding method to ensure that the inner wall is smooth and does not stick to the material.

​Construction steps of adhesive wear-resistant ceramic liner

1. Clean, polish, and dust the equipment to be pasted with ceramics, and remove the oxide layer until the iron white is seen.

2. Cleaning: Clean the equipment with a thinner to remove the dust and oil stains that fell on it after grinding.

3. Brush the rubber surface of the product to increase the surface contact area.

4. The quality inspector checks whether the surface treatment quality meets the requirements and those who fail to rework.

5. Mix and stir the metal surface treatment agent A and B group, and then evenly brush 1-2 times on the metal surface, and let it dry before use.

6. Apply the metal/rubber adhesive directly on the rubber and the treated metal surface and evenly brush the glue two to three times.

7. Bonding: Based on roughening the rubber surface and dusting and cleaning the metal surface, evenly open the glue on the rubber surface and the adhered metal surface twice. When the glue dries until it is not sticky and has a sticky feeling, it can be bonded, and then it can be tapped with a hammer to get rid of the air.

9. The curing time is 48 hours at room temperature.

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