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MgO-CaO-ZrO2 brick for cement kiln high-temperature zone and its preparation method

A manufacturing method and high-temperature zone technology, applied in the field of high-temperature materials, can solve the problems of complex process control, difficult control of the molding process, and difficulty in popularization and use, and achieve simple process operation, simple and easy process control, and improved direct integration rate effect

Inactive Publication Date: 2008-02-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both of these two production processes use pre-synthesized high-purity raw materials, so the cost is high, expensive, and difficult to promote and use in China
Especially when using synthetic magnesia-calcium sand, due to consideration of the hydration problem of magnesia-calcium sand, expensive waterproof organic binders have to be used, the molding process is difficult to control, and the process control is complicated, making it popular in China. very restrictive

Method used

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  • MgO-CaO-ZrO2 brick for cement kiln high-temperature zone and its preparation method
  • MgO-CaO-ZrO2 brick for cement kiln high-temperature zone and its preparation method
  • MgO-CaO-ZrO2 brick for cement kiln high-temperature zone and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0023] The chemical composition of various raw materials is as follows:

[0024]

[0025] The batching range of various raw materials is as follows (wt):

[0026] 40-60% of sintered magnesia, 30-40% of fused magnesia, 3-13% of light calcium carbonate, 2-10% of desiliconized zirconium, 2-6% of calcium zirconate, 1-6% of additive iron red 4%.

[0027] The material is fired in a 98.4-meter large tunnel kiln using a one-step calcination process. The firing temperature is 1680-1750°C, and it is kept at high temperature for 8-12 hours.

[0028] Below are three concrete production examples of the present invention, can understand the present invention in further detail by example.

example 1

[0030] (1) Material preparation: Prepare the raw materials required for production.

[0031] (2) Ingredients: 35% of 5-2mm97 high-purity magnesia, 18% of 95 sintered magnesia less than 2mm, 18% of 96 fused magnesia less than 2mm, 12% of 96 fused magnesia less than 0.088mm, light The added amount of calcium carbonate is 7%, the added amount of desiliconized zirconium is 2%, the added amount of calcium zirconate is 6%, and the added amount of additive iron red is 2%.

[0032] (3) Mixing: Mixing in a small mixing machine in the industrial laboratory, the mixing sequence is: first pour magnesia particles of 5-2mm and less than 2mm into the mixer for dry mixing for 3 minutes, and then pour Pulp waste liquid, mix for about 5 minutes, add the pre-mixed fine powder, and mix for about 20 minutes

[0033] (4) Molding: After the mixed wet material is trapped for 3 hours, it is pressed and formed on a 630T friction brick press. The formed sample is a standard brick for cement kiln, and t...

example 2

[0037] (1) Same as Example 1

[0038] (2) Ingredients: Ingredients: 25% of 5-2mm96 high-purity magnesia, 15% of 5-2mm95 mid-range sintered magnesia, 17% of 95 sintered magnesia less than 2mm, 13 less than 2mm 96 fused magnesia, less than 0.088mm 8% of the 96 fused magnesia, the addition of light calcium carbonate is 12%, the addition of desiliconized zirconium is 4%, the addition of calcium zirconate is 3%, and the addition of additive iron red is 3%.

[0039] (3) Same as Example 1

[0040] (4) Same as Example 1

[0041] (5) Same as Example 1

[0042] (6) Firing: Firing in a 98.4-meter high-temperature tunnel kiln, the firing temperature is 1680°C, and the temperature is kept at high temperature for 8 hours. The total firing time is 87 hours

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Abstract

The invention discloses MgO-CaO-ZrO2 bricks for cement kiln hot zones, wherein the components include magnesite clinker or fused magnesia sand containing 94-99% of magnesium oxide 75-85%, light calcium carbonate 3-13%, zirconium dioxide 2-10% or calcium zirconate 2-6%, iron-oxide red as addition agent 1-4%, and balancing sulfite black liquor as binder bonding agent. The invention also discloses a process for making the MgO-CaO-ZrO2 bricks.

Description

technical field [0001] The invention relates to high-temperature materials used in cement kilns, in particular to MgO-CaO-ZrO for high-temperature zones of cement kilns 2 Brick, the present invention also relates to the MgO-CaO-ZrO 2 Brick manufacturing method. Background technique [0002] Since the 1970s, the modernization process of cement kilns, which is based on dry process, large-scale cement kilns and new precalciner furnaces, has developed rapidly, resulting in the refractory materials used in cement kilns as the main equipment for calcining cement. Greater thermal loads, mechanical stress and chemical attack. Traditional refractory materials have become more and more difficult to meet the demand for refractory materials in the high temperature zone of cement kilns. This results in good resistance to SiO 2 Magnesia-chrome bricks with high temperature strength, good mechanical stress resistance and kiln skin hanging performance are widely used in cement kilns. At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/04C04B35/622
Inventor 高里存孙义王领航
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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