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Mg-Ca-Zr-Ti brick for cement kiln and preparation method thereof

A technology of magnesia-calcium-zirconium-titanium bricks and cement kilns, which is applied in the field of magnesia-calcium-zirconium-titanium bricks for cement kilns and its production. It can solve the problems of easy hydration and poor thermal shock resistance, and achieve good hydration resistance and refractoriness. High, solve the effect of poor thermal shock resistance

Active Publication Date: 2013-06-26
辽宁青花耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a magnesia-calcium-zirconium-titanium brick for cement kiln and its production method, which overcomes the deficiencies of the prior art and solves the problems of poor thermal shock resistance and easy hydration of traditional magnesia-dolomite bricks

Method used

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  • Mg-Ca-Zr-Ti brick for cement kiln and preparation method thereof
  • Mg-Ca-Zr-Ti brick for cement kiln and preparation method thereof
  • Mg-Ca-Zr-Ti brick for cement kiln and preparation method thereof

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Effect test

Embodiment 1

[0036] Take 98% of magnesia-calcium sand, 1.5% of fused stabilized zirconia, and 0.5% of titanium dioxide to prepare brick materials according to the weight percentage. After firing at ℃, the refractory material is obtained.

[0037] After testing, the performance of the refractory material is: the bulk density is 2.99 g cm -3 , The apparent porosity is 14.8%, the normal temperature compressive strength is 58MPa, the high temperature flexural strength is 3.6 MPa, the number of forced air cooling at 950°C is 100 times, and the weight gain rate after the hydration test is 1.7%.

Embodiment 2

[0039] Take 97% of magnesia-calcium sand, 1.5% of fused stabilized zirconia, and 1.5% of titanium dioxide to prepare brick materials according to the weight percentage. After firing at ℃, the refractory material is obtained.

[0040] After testing, the performance of the refractory material is: the bulk density is 3.08 g cm -3 , the apparent porosity is 12.5%, the normal temperature compressive strength is 72MPa, the high temperature flexural strength is 4.5MPa, the number of forced air cooling at 950°C is 100 times, and the weight gain rate after the hydration test is 1.3%.

Embodiment 3

[0042] Take 98.5% of magnesia-calcium sand, 1% of fused stabilized zirconia, and 0.5% of titanium dioxide to prepare brick materials according to the weight percentage. After firing at ℃, the refractory material is obtained.

[0043] After testing, the performance of the refractory material is: the bulk density is 3.03 g cm -3 , the apparent porosity is 13.5%, the normal temperature compressive strength is 65MPa, the high temperature flexural strength is 3.7 MPa, the number of forced air cooling at 950°C is 80 times, and the weight gain rate after the hydration test is 1.7%.

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Abstract

The invention relates to the field of Mg-Ca-containing refractory materials, in particular to a Mg-Ca-Zr-Ti brick for a cement kiln and a preparation method of the brick; the Mg-Ca-Zr-Ti brick for the cement kiln is characterized by comprising the following raw materials by weight percent: 95-99% of synthesized Mg-Ca sand, 1-5% of electric smelting stable zirconium oxide, 1-3% of titanium dioxide and bonding agent, wherein the weight of the bonding agent accounts for 2-5% of the total weight of the three raw materials, and paraffin is adopted as the bonding agent. The preparation method of the brick has the technological process steps of: preparing the raw materials, blending, mixing, drying, molding by pressing and sintering and is characterized in that the sintering temperature is between 1520 DEG C and 1570 DEG C. Compared with the prior art, on the premise that the advantages of a magnesite-dolomite brick are maintained, the Mg-Ca-Zr-Ti brick effectively overcomes the disadvantages of the conventional magnesite-dolomite brick, such as thermal shock resistance and high hydration rate; and the Mg-Ca-Zr-Ti brick has the characteristics of good thermal shock resistance and good hydration resistance, and can be used for replacing a magnesite-chrome brick used for a cement kiln burning zone, thus realizing non-chromium characteristic of the refractory brick for the cement kiln.

Description

technical field [0001] The invention relates to the field of magnesium-calcium-containing refractory materials, in particular to a magnesium-calcium-zirconium-titanium brick for cement kilns and a production method thereof. Background technique [0002] At present, magnesia-chrome bricks are used as the main kiln lining in the firing zone of cement kilns. This kind of bricks has the following advantages: ① Good kiln skin hanging property ② Good thermal shock resistance and low thermal conductivity ③ Good for cement clinker Good corrosion resistance. However, when magnesia-chrome bricks are used in cement kilns, under alkaline and oxidizing atmospheres, Cr in magnesia-chrome bricks 3+ It is easily converted into Cr with strong oxidation ability 6+ , generating R 2 CrO 4 Such highly toxic and carcinogenic hexavalent chromium compounds are condensed in kiln bricks. After the kiln bricks are removed, the residual bricks with hexavalent chromium will cause serious pollution ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/63
Inventor 曹俊庆潘波王健东杨晓峰范连伟
Owner 辽宁青花耐火材料股份有限公司
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