What refractory castable should be used for kiln lining at 1300℃?
The choice of refractory castables when the furnace lining temperature is 1300°C depends on different furnace types and different furnace lining atmospheres. No matter what material is selected, the ultimate goal is to save energy and reduce consumption, achieve effective use and have a long service life.
1. Consider the fuel used by the stove
Before choosing, you must first consider the fuel used in the furnace, the raw material medium of the fired product, and the degree and nature of the corrosiveness of the raw material components. Is it acidic or alkaline? In addition, there are external factors to consider such as the furnace type, whether there is erosion and wear caused by wind speed and mechanical stress, and the combustion method.
2. Fire resistance and operating temperature are very important
The furnace temperature of 1300°C is the direct contact temperature of the flame, not the refractory temperature. The definition of refractory degree and operating temperature is very important. Generally, high alumina refractory castables can be used for a furnace temperature of 1300°C. Currently, all high-aluminum castables are used. Basically, low-cement materials are used, but if the erosion is severe, acidic or alkaline corrosion-resistant materials must be selected according to the nature of the erosion. If it is acidic corrosion, you can choose water glass binder or phosphoric acid-bonded refractory castable. If it is alkaline corrosion, you can choose high wear-resistant material and magnesium refractory castable. The high wear-resistant material is added with silicon carbide, which can resist erosion and play a role. Wear resistance. When selecting magnesium materials, attention should be paid to the moisture and wind pressure issues in the furnace lining.
3. The construction link is also very important
After selecting high-aluminum refractory castables, the construction process is also very important, because the selected high-aluminum castables are also divided into different quality levels. If the early setting is too fast, it may be that the control ratio of binder and micro powder is unreasonable. If it is the amount of cement Adding too much will not only cause the problem of rapid condensation, but also cause the later strength of the high-aluminum refractory castable to be affected.
If the high-aluminum castable solidifies too slowly, the construction temperature should be considered. When adding water, the amount should be controlled. When the temperature is low, the drinking water should be heated to 30°C, and then mixed with the material before use. If it clots within 40 minutes. Then baking according to a reasonable baking system can completely ensure the service life of high-aluminum refractory castables.
