- Time:Jul 19, 2022
Refractory materials for cement kiln are divided into shaped refractory materials and unshaped refractory materials. The former refers to refractory bricks, including periclase-hercynite refractory bricks, magnesia-alumina spinel bricks, GUIMO abrasion resistant bricks, spalling resistant high alumina bricks, HX-35 low thermal conductivity, abrasion resistant bricks, high-strength alkali-resistant bricks, composite structure GUIMO bricks etc
Domestic CRK-cement rotary kiln from wet to dry, from scratch, from 2500t/d to 10000t/d, the quantity is from small to large, and gradually phase out small CRK-cement rotary kiln, equipped with large CRK-cement rotary kiln, From the single production of cement clinker to the co-processing of waste solid-liquid gas waste, the refractory materials for CRK kilns have also been changing. Due to the special structure of CRK: the total length is about 60-100 meters, in addition to the complex preheating decomposition In addition to the main system, there are also huge auxiliary systems such as ventilation and waste heat power generation, and these systems are all under high temperature and require the protection of refractory bricks and castables.
In addition, this huge main and auxiliary system is in a severe chemical erosion working environment, and there are many differences in each part: high and low temperature, frequency and amplitude changes, the degree of scouring of the air flow, and the vastly different stress conditions. The size of the mechanical stress and the degree of wear of the raw clinker are different, resulting in complicated internal conditions, so the performance requirements for refractory materials are also very complex.
Although the use environments of refractory materials for CRK are very different, they also have some things in common: severe chemical aggressive atmosphere; large mechanical stress and wear, strong thermal shock stress, so a series of refractory materials must be used. Looking at the above situation, the difference is mainly the temperature difference. For this reason, the main requirements for refractory materials are: strong chemical corrosion resistance, high strength, wear resistance, strong thermal shock resistance, and the refractoriness of different parts is quite different.
The damage causes of refractory materials for CRK can be roughly divided into: thermal shock cracks and mechanical stress damage, alkali spalling, wear and tear of abrasive air scouring materials, and damage caused by non-material properties such as construction and maintenance. Therefore, the choice of refractory materials should be more careful.
Refractory materials for cement kiln are divided into shaped refractory materials and unshaped refractory materials. The former refers to refractory bricks, including periclase-hercynite refractory bricks, magnesia-alumina spinel bricks, GUIMO abrasion resistant bricks, spalling resistant high alumina bricks, HX-35 low thermal conductivity, abrasion resistant bricks, high-strength alkali-resistant bricks, composite structure GUIMO bricks etc.
Unshaped refractory materials are widely used in CRK-cement rotary kiln. Among them, the commonly used refractory castables are: special castables for kiln mouth, special castables for coal injection pipes, silicon carbide anti-skin castables, high-performance castables, Steel fiber reinforced wear-resistant castables and high-strength alkali-resistant castables, etc., have their own advantages and disadvantages due to the different properties of different types of refractory castables, and can be selected according to the needs of different parts of the cement kiln.
