May. 10, 2021
Aluminum silicate refractory fiber is a new lightweight refractory material. It has the advantages of light weight, high temperature resistance, good thermal stability, low thermal conductivity, and small heat capacity. It is often used in various industrial furnaces.
There are two basic production methods for aluminum silicate refractory fiber; one is the spinning method (centrifugal method) and the other is the blowing method. The process is raw material-cleaning and collecting of material-crushing-melting-wool making-wool collecting chamber. The following is a detailed introduction of blowing method.
(1) Raw material: The performance of the fiber, especially the high temperature working performance, has an important relationship with the composition of the raw material. The most widely used aluminum silicate refractory fiber in various industrial furnaces is made from Shandong's flint as raw material. The molten material flint is blown into fibers at high speed and quenching, and its internal structure is amorphous. Once the temperature exceeds 900°C, mullite crystals begin to precipitate, and when the temperature is 1200°C, cristobalite begins to precipitate. As the temperature continues to rise above 1200°C, a large amount of crystal phase is precipitated, the fiber gradually becomes brittle, and the strength decreases sharply. Falling off under corrosion and vibration. In order to increase the working temperature of the fiber, a combination of natural minerals and industrial alumina powder is also used to produce high-alumina refractory fiber. The characteristic of this method is to increase the Al2O3 content of the product to increase its working temperature. Because of the increase in Al2O3 content, the maximum working temperature of the product also increases.
Next issue we will continue to introduce production process of aluminum silicate refractory fiber. Please stay tuned!