Anti shedding high alumina brick is a fired product made of high-grade high alumina bauxite clinker and ZrO2 containing composite materials, which are formed by high-pressure molding according to a certain ratio.
Anti shedding high alumina bricks have strong anti shedding ability, high fire resistance, good crack resistance, and strong corrosion resistance. They also have the functions of resisting corrosion from potassium, sodium, sulfur, chlorine, and alkaline salts, low thermal conductivity, etc. They are ideal materials for the transition zone and differentiation zone of cement kilns, and can be used for kiln door covers, cooling machines, and other parts of cement kilns. At present, anti shedding high alumina bricks are primarily used in cement kilns. Anti falling high alumina bricks have a regular appearance, smooth flow channels, and accurate dimensions.
The mineral composition of anti shedding high alumina bricks is primarily composed of mullite (3Al2O3 · 2SiO2), corundum (Al2O3), and glass phase. The solid-phase reaction between the composition of limestone and the brick lining is primarily:
CaO+Al2O3→CaO·Al2O3
CaO+Fe2O3→ CaO·Fe2O3
Solid phase reaction changes the original arrangement structure of refractory bricks. When the composition of the materials entering the kiln is inappropriate or the kiln temperature is too high, excessive infiltration and accumulation of liquid phase can cause the structure of high alumina bricks to become loose, brittle and hard, thereby reducing the service life of the brick lining. Handling method. Based on the above analysis results, our company's handling measures are as follows:
(1) Repair the raw material batching scale, adjust the composition of the raw materials entering the kiln, appropriately increase the saturation coefficient of the raw materials entering the kiln, control the clinker ratio values to KH: 0.90 ± 0.02, SM: 2.6 ± 0.2, IM: 1.7 ± 0.2, improve the burnability of the raw materials, and reduce the corrosion of the kiln lining by the clinker.
(2) Strengthen the control of coal powder fineness and adjust the coal powder fineness to 0.080mm square hole sieve residue<10%, requiring a pass rate of over 95%.
(3) Organize the discharge chutes at the bottom of the raw material homogenization silo to ensure smooth discharge in each area. Ensure that all pneumatic valves and electric actuators are sensitive and in place, and restore the automatic control circuit at the bottom of the silo. Stabilize the weighing bin material level between 20-25t, ensuring that the amount of raw material entering the kiln is stable at ± 5t/h.
(4) Strengthen operation and control the kiln tail temperature between 1050-1100 ℃.
(5) Starting from maintaining the kiln lining, eradicate the phenomenon of "grinding and cooling the kiln".
(6) After stopping the kiln, a special wrench was made to tighten the connecting bolts of the large gear ring, and welded firmly with electric welding to prevent the bolts from loosening again.
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Email:wp@cnjingganrefractory.com/sdwenping@163.com
TEL: 86-0533-4188518 / FAX: 86-0533-4188518
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