Due to the process and equipment requirements of industrial kilns in metallurgy, building materials, glass, electric power, chemical industries and other industries, refractory materials must be built as linings. The performance of refractory materials directly affects the quality and output of industrial products in the production process, as well as the life of industrial kilns and products. Therefore, in the design, manufacture and use of industrial kilns, refractories have always been a topic of concern to enterprises and scientific and technical personnel.
Anti-stripping high-alumina brick is a new type of high-aluminum material specially produced for the production of cement kiln lining in my country. It has excellent thermal shock stability, high load softening temperature, high high temperature strength, alkali resistance and clinker corrosion, high temperature wear resistance, peeling resistance, anti-skinning, ring formation and low thermal conductivity. It has been widely used in my country's new dry process kiln, Liboer kiln and wet process kiln. The parts used include the kiln door cover, the rising flue, the cooling belt, the decomposition belt, the safety belt, the transition belt, the rear wall and side wall of the cooler, and the curved roof of the beam. It has been successfully applied in almost all internal kilns.
composition:
Anti-stripping high alumina brick is a special product developed for alumina production clinker firing belt.
The anti-stripping high alumina brick is a fired product made by high-grade high alumina bauxite clinker and ZrO2 containing synthetic materials as raw materials and high-pressure molding in a certain proportion. The product has strong anti-stripping ability, but also has the properties of resistance to potassium, sodium, sulfur, chlorine and alkaline salt, and low thermal conductivity. It is an ideal material for cement void transition zone and decomposition zone. It can also be used for cement kiln doors. Covers, coolers and other parts.
The main mineral composition is mullite (3Al203·2SiO), corundum (Al03) and glass phase. The solid phase reaction between the calcareous composition and the brick lining is mainly:
CaO+Al03→CaO·Al203
CaO+Fe203→CaO·Fe203
The alumina clinker kiln material has the characteristics of high temperature, high alkali and strong wear. The calcined material contains about 20% soda ash, and the normal firing temperature is 1250°C-1360°C. In the past, ordinary clay bricks, high alumina bricks and phosphate combined high alumina bricks have been used as linings, but because of these refractory materials The load softening temperature is too low or too high, or the thermal shock stability is too poor, or is not resistant to wear, etc., which can cause the kiln skin to fail to hang, and the bricks will be severely peeled off, alkali corrosion, and abrasion, so that the kiln lining life is only about 120 days. The operating rate is only 70-80%, which seriously restricts continuous production. Therefore, the rotary kiln lining must have good high temperature resistance, corrosion resistance, certain strength and wear resistance, and should have excellent thermal shock during medium time. stability.
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