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Reburnt magnesia powder is an indispensable refractory

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Reburnt magnesia powder is an indispensable refractory

Date:2017-05-06 author: click:

Reburnt magnesia powder is an indispensable refractory




Aluminum oxide (_-Al2O3) powder, silica powder and pure calcium aluminate cement are used as aggregates, and the amount of alumina powder is added. Increasing alumina powder will greatly improve the high temperature strength and wear resistance of castables, but too much alumina powder will affect the construction performance of castables, and also have a negative impact on the alkali resistance and corrosion resistance of castables. Therefore, the addition of alumina powder plays an important role in the overall performance of castables.




The pouring material after vibration should keep its natural surface, not be polished with tools, and not be polished with cement powder. After the completion of the construction, the construction body should be strictly prohibited from moving, knocking and shaking within 24 hours, especially before the hardening of the casting material, otherwise cracks will occur to complete destruction. Because the production and process control of cement enterprises have their own characteristics, the development of high-performance wear-resistant and refractory castables is to improve the performance of refractory materials (i.e. strength and wear-resistant, alkali-resistant and corrosion-resistant) in the third air duct, windshield valve, grate cooler throat and kiln door cover, while improving the construction scheme and guaranteeing the construction quality. The addition amount of pure calcium aluminate cement. Adding proper amount of pure calcium aluminate cement can improve the high temperature service performance and low temperature service strength of castables. However, excessive addition will affect the construction performance of castables and shorten the hardening time of castables. Therefore, the pure calcium aluminate cement in the castable must be appropriate. Water addition during construction.




The construction performance of castable is not obtained by simply adding water. If too much water is added, the aggregate will be separated from the base material, which will affect the performance of the castable. It will also reduce the density, strength, alkali resistance and wear resistance of the castable. Insufficient water supply, poor construction performance, material can not flow normally and achieve compact filling, bubble can not be discharged, can not form a compact accumulation, will also affect the performance of castables. Therefore, it is very important to control the amount of water added during the construction of castables for the performance of castables.




Refractory castables are the basic castables that can not be shortage in high temperature technology industry. The development of hardware industry, pig iron industry, non-ferrous metal metallurgy industry, machinery industry, chemical industry, modern high-tech industry (rocket, thermonuclear reactor) and other key pillar industries of people's finance are inseparable from the development of refractory castable industry. The quality and functional characteristics of refractory castables not only directly affect the commodity quality, production cost and financial benefits of refractory castables users, but also affect production and human safety. The development of refractory castable industry has become one of the key prerequisites for people's financial development.




The construction of castables depends on the rheological properties of castables, and the rheological properties of castables depend on the particle size distribution of castables (i.e. the ratio of aggregate to matrix). At the same time, according to the process requirements of cement kiln (including process temperature, dust content, etc.), the alkali resistance and wear resistance of castables are improved.

Reburnt magnesia powder

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