- Time:Sep 04, 2023
With the continuous increase of cement clinker production, the speed of cement kiln continues to increase, the kiln calcination temperature continues to increase, and more and more production lines begin to process garbage, hazardous waste and other substances at the same time, all of which have brought great impact on the service life of refractory bricks in cement kilns. great challenge. In addition, the damage of refractory bricks is also affected by chemical factors. In order to improve the life of cement kiln refractory bricks, cement kiln refractory bricks are required to have corrosion resistance. The following will introduce which refractory bricks can resist chemical erosion of cement kiln.
In order to solve the above chemical damage problems in cement kilns, the ZJMA magnesia-alumina spinel bricks and ZJMI magnesia-iron spinel bricks developed and produced by Zhenjin Refractories can effectively reduce the damage of refractory materials caused by chemical factors and prolong the cement life. The service life of refractory bricks for kiln.
1. Advantages and applicable areas of ZJMA magnesia-alumina spinel bricks
ZJMA magnesia-aluminum spinel bricks, through the optimal selection of raw materials, reduce SiO2 and Fe2O3 that affect product stability to a reasonable range, and improve the corrosion resistance of spinel bricks. By introducing alumina-based spinel, the product is produced in-situ spinel during high-temperature sintering, and the thermal shock stability of the product is improved by using the microcracks generated during the reaction process.
Because the magnesia-alumina spinel phase is stable at high temperature and is not easily corroded by alkaline substances, the magnesia-alumina spinel brick has a lower ASR and is less likely to react with alkaline substances. The magnesia-alumina spinel phase has low solubility and chemical activity, so it can maintain structural stability in an alkaline environment, making the magnesia-alumina spinel brick resistant to alkaline erosion and prolonging its service life.
Because magnesia-aluminum spinel bricks are widely used in the transition zone of cement kiln, and the firing zone of cement kiln has higher temperature and more complex environment, so the ZJMI magnesia-iron spinel brick suitable for firing zone has been developed.
2. Advantages and applicable areas of ZJMI magnesia-iron spinel bricks
ZJMI magnesia-iron spinel bricks are based on magnesia and iron-aluminum spinel as the main materials, and by introducing active spinel into the matrix components, the products form a network-like spinel structure during the sintering process. , to achieve the effect of anti-corrosion and penetration of sulfur, chloride and saline alkali components.
The iron-aluminum spinel phase in magnesia-iron spinel bricks is not easy to react with alkaline substances, so it has a low ASR, which enables magnesia-iron spinel bricks to maintain structural stability when exposed to alkaline environments.
At the same time, magnesia-iron spinel has high chemical inertness, low solubility and reactivity to alkaline substances, so in alkaline environment, magnesia-iron spinel bricks can effectively resist the erosion and corrosion of alkaline substances.
In addition, magnesia-iron spinel bricks are also chromium-free and low-iron environmental protection bricks, which can widely replace magnesia-chrome bricks in the cement industry and are suitable for the firing zone of cement kilns.
Magnesia-iron spinel bricks and magnesia-alumina spinel bricks have low ASR, excellent alkali resistance, excellent resistance to alkali and salt penetration, and the products are chromium-free and low-iron. The superposition of these advantages enables the product to effectively solve the common chemical damage of cement kilns, ensure the efficient and safe operation of cement kilns, and achieve the purpose of saving energy, reducing consumption, and reducing costs. It is an ideal environmentally friendly alkaline refractory material for cement kilns.
