Liaoning Kaolin Calcination Process Operation Requirements

　　Kaolin is soft clay, white and fine, with fire resistance, plasticity and other characteristics. Kaolin is widely used, mainly for refractory materials, paper making, ceramics, as well as coatings, rubber, plastics, pigments, cosmetics, pharmaceuticals, textiles, chemicals and other industries. Then, the following describes the operation requirements of Liaoning kaolin calcination process.

Liaoning kaolin calcination process operation requirements:

1. Liaoning kaolin calcination process calcination ignition operation

Ignition may occur after new construction or maintenance, but the whole roasting system shall be subject to linkage commissioning before ignition. Avoid small equipment faults during operation, which may lead to temperature rise of preheater system, blockage of cyclone and raw material pipeline, etc. Either firewood or diesel will ignite. All high temperature fan dampers must be closed, and the ignition chimney should be properly opened when necessary to keep the kaolin rotary kiln head in a slight negative pressure state, so as to avoid too much wind and difficult ignition. When pulverized coal is injected, the combustion rate of pulverized coal shall be ensured as far as possible, and excessive injection is not allowed. Slowly add coal; Turn the kiln every 1/4 time at regular intervals to avoid bending and deformation of the barrel. When the temperature reaches above 700, use the auxiliary conveyor to rotate the continuous kiln, start the high-temperature fan if necessary, and adjust the opening of the air door appropriately; When the temperature reaches 900, the main pass kiln can be used. When the diesel engine is ignited, close all oil pumps, but adjust the valve opening properly; Refueling can be stopped only after the materials reach the burning zone after feeding. The feeding time depends on the kiln tail temperature of the kaolin rotary kiln and the outlet temperature of the preheater; The initial feeding amount of kaolin rotary kiln should be relatively high, generally not less than 60% of the design output. Then gradually increase the supply, and the supply range shall not be less than or greater than the normal supply; In addition, the operation time under low supply shall be shortened as much as possible. This is because the edge collapse is easy to occur during this period, and the preheater system is easy to be blocked.

2. Liaoning kaolin calcination process hanging kiln skin operation

After the bricks are replaced, the kiln shall be properly fired to avoid sharp temperature rise. First of all, there are certain requirements for raw material composition, especially the amount of liquid phase and the refractoriness of materials. Large amount of liquid phase is easy to form kiln skin, but it is easy to collapse, unstable, and cannot withstand high temperature calcination; In the case of less liquid phase and refractory materials, it is difficult to form the kiln skin of kaolin rotary kiln, which is quite solid after formation, but it is not easy to replenish materials in case of collapse. According to years of experience of our factory, when hanging the kiln skin, it is generally appropriate to use the raw material powder from normal production, which is conducive to forming the kiln skin. During the calcination process, the kiln skin of the kaolin rotary kiln is dynamically balanced, and even if the small pieces collapse, it is easy to make up in time. However, it is necessary to avoid insufficient cloth walking and burning through during the process of hanging kiln skin.

3. Unstable processing operation of raw materials for calcination process of high Liaoning kaolin

In normal production, the supply of raw materials fluctuates, but the fluctuation range is small. However, when there are some problems with the equipment, or the moisture of raw materials is difficult to control in the rainy season, the raw materials are caked on the top or wall of the warehouse, and the supply of raw materials is not smooth, large fluctuations will occur. In this case, the operator is required to observe carefully, adjust carefully and have a certain predictability. Determine the amount of materials according to the current change of some transportation equipment. Take countermeasures in advance to reduce adverse effects on output, quality and equipment.

The above is the operation requirements of Liaoning kaolin calcination process. For more information, please feel free to contact us! Our company has many years of experience and is looking forward to your joining at any time.