Product Introduction
Kaolin rotary kiln is a kind of equipment specially used for calcining kaolin. Kaolin is a non-metallic mineral widely used in papermaking, ceramics, coatings, rubber and other industries. By calcining kaolin in a rotary kiln, its chemical stability, whiteness and adsorption can be improved, and its physical and chemical properties can be improved, making its performance in industrial applications more excellent.
Structural Composition
1. Cylinder: The core part of the rotary kiln, composed of high-temperature resistant steel and refractory bricks. The kiln body is usually an inclined structure, and the material is heated evenly in the kiln through slow rotation.
2. Transmission system: including motor, reducer and gear system, driving the cylinder to rotate to ensure the continuous movement of materials.
3. Combustion system: Provide the kiln with high-temperature heat source required for calcination. The fuel can be coal, natural gas, heavy oil, etc. The appropriate fuel supply method is selected according to the needs.
4. Cooling device: used to quickly cool down the calcined kaolin to maintain its activity and physical properties. Air or water cooling devices are usually used.
5. Exhaust gas treatment system: including dust collector and exhaust gas purification device, which effectively treats the flue gas and dust generated during the calcination process to ensure environmental protection standards.
Table of Contents
Working principle
The working process of the kaolin rotary kiln is to dehydrate and decarbonize the original kaolin ore through high-temperature calcination to obtain a more stable and high-purity calcined kaolin. Its working principle is as follows:
1. Feeding: The kaolin ore enters the rotary kiln evenly through the conveying device, and the particle size of the material entering the calcination system is usually pretreated to ensure uniform calcination.
2. Preheating: Before entering the high-temperature zone of the rotary kiln, the kaolin is first heated in the preheating zone, so that its temperature gradually rises, part of the water evaporates, and the material begins to dehydrate.
3. Calcination: Kaolin is calcined in the high-temperature zone of the rotary kiln (usually between 950℃ and 1050℃). Through high-temperature treatment, the structural water and organic impurities in the kaolin are removed, the crystal structure changes, and high-temperature phase kaolin or metakaolin is generated.
4. Cooling: The calcined kaolin is quickly cooled by the cooling device to stabilize the physical and chemical properties of the material. The cooled kaolin is discharged from the kiln tail for further processing or use.
5. Tail gas treatment: The waste gas generated during the calcination process is dusted and purified by the tail gas treatment device to ensure compliance with environmental emission standards.
Application areas
Papermaking industry
Calcinated kaolin is used as a filler for papermaking coatings to increase the whiteness and smoothness of paper and improve the printing performance of paper.
Ceramic industry
Kaolin is an important component of ceramic raw materials. Calcinated kaolin has better chemical stability and high temperature resistance, which helps to shape and improve the quality of ceramic products.
Coating and paint industry
Calcinated kaolin can be used as a filler in coatings and paints to increase their hiding power and anti-aging properties.
Rubber industry
Calcinated kaolin can improve the mechanical strength, wear resistance and aging resistance of rubber products.
Plastic and chemical industry
Calcined kaolin is used in plastics and chemical raw materials, which can enhance the physical properties of the materials, such as increasing heat resistance and impact resistance.
Advantages
1. Continuous production: The rotary kiln can achieve continuous production and is suitable for large-scale kaolin calcination processing needs.
2. Easy operation: The rotary kiln has a high degree of automation, simple operation, convenient maintenance, and saves labor costs.
3. High efficiency and low energy consumption: Through efficient thermal energy utilization design, the calcination process has low energy consumption and high equipment operation efficiency.
4. Stable product quality: The kaolin calcined in the rotary kiln has uniform quality, and the whiteness and physical and chemical properties of the product are stable, which meets the needs of high-standard industrial applications.
5. Good environmental protection: The use of efficient tail gas treatment equipment reduces environmental pollution during the calcination process and meets the environmental protection standards of modern industry.