The erosion mechanism of refractory brick

Both the wet process kiln, or new dry rotary kiln, in the clinker calcinations process, because the kiln gas temperature is much higher than the temperature of the materials, kiln rotates one circle, kiln lining surface is subjected to thermal shock cycle, changes in temperature range of 150 ~ 250 DEG C, 10 to 20mm in the kiln lining surface within the scope of generating heat stress. Kiln lining also bear due to the rotation of the brick kiln alternating radial and axial mechanical stress, and calcining materials erosion wear. Due to simultaneous silicate melt, easily in the environment of high temperature and kiln refractory lining surface interaction between the formation of the initial layer, and at the same time along the internal refractory brick pores to refractory bricks, refractory bricks with bonded together, make the refractory brick surface 10 ~ 20mm within the scope of the chemical composition and phase composition changes, techniques to reduce the performance of refractory brick. When the sintering range of material forming narrow or short flame burning urgency to produce local high temperature, the lowest temperature of kiln will make the skin surface is higher than that of material liquid solidification temperature, kiln skin surface layer from solid to liquid and fall off, and from the outside to the inside into the initial kiln crust is formed after the initial layer of the new kiln crust. When this happens repeatedly, firing zone kiln gradually thinned, even completely off, leading to local exposed kiln body and red kiln. In fact, firing zone kiln lining damage is that, in the high temperature region residual firebrick thickness is substantially larger radius of curvature of the curve distribution of arc bottom, sometimes falls on the inner surface of the kiln.