Aluminum Silicate Ceramic Fiber Cotton

Aluminum silicate fiber cotton is a new, lightweight refractory material and an excellent high-temperature insulation material. ‌Famous for its excellent high temperature resistance, ‌good thermal stability, ‌low thermal conductivity, ‌small heat capacity, ‌good resistance to mechanical vibration, ‌small thermal expansion and excellent thermal insulation properties. ‌This material mainly uses burnt gemstone as the main raw material. After being melted at high temperature, it is processed using high-speed centrifugal method or blowing method, spinning fiber forming process and other processes. ‌‌It can be woven or woven into aluminum silicate fiber board, ‌Aluminum silicate fiber felt, ‌Aluminum silicate fiber rope, ‌Aluminum silicate fiber blanket and other products, ‌These products are non-toxic, ‌long service life, ‌high tensile strength, ‌high temperature resistance, light weight, and It has good elasticity, excellent filling performance and thermal shock resistance, and low thermal conductivity. It has become an ideal material to replace asbestos and can resist the attack of most chemicals except hydrofluoric acid, phosphoric acid and strong alkali. erosion. In addition, it has good sound-absorbing performance that cannot be compared with other materials, and has significant energy-saving and heat-storage effects; it is easy to construct, does not require an oven, shortens the construction period, and is easy to install.

It is particularly suitable for heat preservation of thermal energy equipment in the fields of metallurgy, electricity, machinery, chemical industry, etc. In addition, it has excellent sound insulation and sound absorption properties. Its porous structure can effectively absorb sound waves and provide excellent sound insulation effect.

 

Aluminum silicate ceramic fiber wool is a loose cotton-like fiber, which is also the basic form of refractory fiber. It is characterized by high temperature resistance, light weight, good elasticity, excellent filling performance and thermal shock resistance, and low thermal conductivity. Aluminum silicate ceramic fiber wool is an excellent high-temperature thermal insulation material. There are generally two types of aluminum silicate ceramic fiber wool, one is unprocessed raw cotton, and the other is processed cotton. Its length is generally less than 25 mm. It is mainly used as a filling material for industrial kiln expansion joints, backing insulation materials, and raw materials for refractory fiber products.

Aluminum silicate ceramic fiber wool is mainly made of calcined coke refractory clay raw materials, calcined materials of natural minerals such as kaolin or refractory clay, and some are added with a small amount of additives such as B₂O₃ or ZrO₂, which are melted in an arc furnace or resistance furnace to form a stable stream. The molten liquid stream is dispersed and fiberized by the blowing method or centrifugal spinning method to make aluminum silicate ceramic fiber wool. The obtained ordinary aluminum silicate fiber can be further processed into various forms of secondary products.

Raw materials Aluminum silicate ceramic fiber wool uses refractory clay clinker (coal ore) as the main raw material (see kaolin). Coal ore used as the raw material of refractory fiber should especially control the content of Fe₂O₃, K₂O and Na₂O. Generally, Al₂O₃ 43%~54%, SiO₂ 47%~53%, and Fe₂O₃＜1.2% are required.

Technology The production process of aluminum silicate ceramic fiber wool mainly includes three steps: raw material processing, melting and fiber forming.

Aluminum silicate ceramic fiber wool raw material processing:The coke is crushed into particles smaller than 3 mm (when melting in an electric arc furnace, the particle size should be slightly larger). In order to make the melt formed after the batch material is melted have a viscosity suitable for fiber formation and to improve certain properties of the fiber, a small amount of additives such as borax can be added to the ingredients.

melt:The melting temperature of refractory fiber batch is 2000～2200℃. In order to obtain such a high temperature, electric furnace can only be used as melting equipment. Electric furnace can be divided into arc furnace and resistance furnace. Arc furnace has two types: single-phase and three-phase. The commonly used arc furnace is three-phase. Generally, no molten pool is formed in the arc furnace, and the melt flows with the flow, and the flow is discontinuous and unstable. Therefore, it cannot operate continuously, the thermal efficiency is low, and the fiber quality is poor. The power consumption per ton of fiber is 4000～5000kW·h, and the electrode consumption is 40～80kg/t. The slag ball content of refractory fiber is as high as 20%～40%. The resistance furnace is to immerse the metal electrode in the molten material. When the strong current passes through the electrode and passes through the aluminum silicate melt, the melt continuously generates a lot of heat due to its own resistance, thereby generating a high temperature zone in the center of the furnace, gradually melting the added charge. The melt is discharged outward through the center flow port of the furnace. Continuously add materials to the furnace, the charge is continuously melted, and the melt is continuously discharged out of the furnace and fiberized. The core of the operation of the resistance furnace is to achieve the dynamic balance of the above points. The resistance furnace has a stable working state, high thermal efficiency and good fiber quality. The power consumption is 3000-4000kW·h per ton of fiber, and the molybdenum electrode consumption is 2kg. The slag ball content of the refractory fiber is 3%-4%.

Fiberization:There are two fiber-forming methods for aluminum silicate ceramic fiber wool melt, namely, blowing or centrifugal spinning. The blowing method is simpler, usually using compressed air or high-temperature steam to spray on the melt stream flowing out of the electric furnace spout. The melt is affected by the high-speed airflow and firstly divided into fine droplets, and then the fine droplets are elongated under the action of the airflow, so that the melt is fiberized. The commonly used gas pressure of the blowing method is 0.6-0.8MPa. The blowing method has simple equipment and the obtained fiber is finer, but the fiber is short and the slag ball content is higher.

Performance The maximum operating temperature of aluminum silicate ceramic fiber wool is 1260℃, and the long-term operating temperature is about 1000℃.

Aluminosilicate refractory fiber is a glass fiber heat-insulating refractory material made of refractory clay clinker as the main raw material. Aluminosilicate refractory fiber is also called ordinary aluminum silicate refractory fiber.

Aluminum silicate ceramic fiber wool is made of high-purity raw materials melted at high temperature in a resistance furnace and then produced by blowing or spinning. It has the characteristics of high temperature resistance, good heat insulation performance, and softness. It can resist the erosion of most chemicals except hydrofluoric acid, phosphoric acid and strong alkali. In addition, it has good sound absorption performance that other materials cannot match.

■ Low thermal conductivity and heat capacity;

■ Excellent thermal stability, not easy to powderize at high temperature;

■ Good chemical stability, no corrosive substances;

■ Excellent heat insulation and sound absorption.

Applications

■ Filling materials for gaps in the wall lining of kiln cars, chimneys, and high-temperature kiln heating devices;

■ Raw materials for the production of fiber paper, vacuum-formed products, refractory fiber castings, and other refractory fiber products.

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