Magnesia-hercynite brick used by high temperature zone of cement kiln and use method thereof

Abstract

The invention belongs to the field of refractory materials and relates to a magnesia-hercynite brick used by the high temperature zone of a cement kiln and a use method thereof. The brick is characterized in that high-quality magnesia and electric melting synthesis hercynite are taken as main raw materials which comprises the following components in percentage by weight: 40-50 percent of 3-1mm coarse magnesia, 10-15 percent of 1-0.088mm medium magnesia, 30-35 percent of fine magnesia less than 0.088mm, and 6.5-11.5 percent of 3-0mm electric melting synthesis hercynite. The raw materials after mixing are added with pulp mill waste for mixing, pressing, drying and sintering at the temperature more than 1,600 DEG C, thus obtaining the magnesia-hercynite brick. The mass percentage of the ingredients of the produced magnesia-hercynite brick is as follows: 2.5-5.5 percent of Fe2O3, 4.0-6.0 percent of Al2O3 and 93.0-89.0 percent of MgO plus other microcomponents. According to different operating situations of different cement kilns and by combining the characteristic of chrome-free brick, the invention replaces magnesite-chrome brick region by region, makes full use of the advantages and bypasses the disadvantages, improves the cost performance of the refractory brick used by the high temperature zone to the greatest extent and realizes chrome-free refractory brick used by the cement kiln.

Description

Technical field: [0001] The invention belongs to the field of refractory materials, and relates to a magnesium-iron-aluminum spinel brick used in a high-temperature zone of a cement kiln and a use method thereof. According to the different operating conditions of different cement kilns, combined with the characteristics of chrome-free bricks, replace magnesia-chrome bricks in different areas, maximize the strengths and avoid weaknesses, improve the cost performance of refractory bricks for high-temperature zones as much as possible, and realize the chrome-free refractory bricks for cement kilns. Background technique: [0002] The high temperature zone of the dry process cement kiln can be divided into a firing zone and a transition zone, see the attached figure 1 . The kiln lining in the high temperature zone of the cement kiln is subject to the most severe thermal, mechanical and chemical damage. 60-70% of the total consumption of refractory materials in the whole kiln sys...

AI Technical Summary

Problems solved by technology

However, the comprehensive performance is not as good as that of magnesia-chrome bricks. Therefore, in order to realize the chrome-free refractory materials used in the high-temperature zone of cement kiln, we must, according to the advantages and disadvantages of different chrome-free bricks, maximize the strengths and avoid weaknesses, and replace magnesia-chrome bricks in sections to improve the chrome-free bricks as much as possible. value for money

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