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Periclase-magnesium aluminate spinel refractory material for rotary cement kiln and preparation method thereof

A technology of magnesia-alumina spinel and cement rotary kiln, which is applied in the field of refractory materials for cement rotary kiln, can solve the problems of not being widely used and poor performance of hanging kiln skin, and achieve good thermal shock stability and good performance of hanging kiln skin , distribution controllable effect

Inactive Publication Date: 2015-06-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production method of magnesia-alumina-spinel bricks (ZL 200910066276.9)), the periclase-magnesia-alumina-spinel refractory material prepared by these technologies has poor kiln skin hanging performance, and still cannot be widely used in the firing zone of cement rotary kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A periclase-magnesia-alumina-spinel refractory material for cement rotary kiln and its preparation method: 15-18wt% of periclase-magnesia-alumina-spinel composite material with a particle size of 5-3mm, 30-33wt% % of periclase-magnesium aluminum spinel composite material with a particle size of 3~1mm, 15~17wt% of periclase-magnesium aluminum spinel composite material with a particle size of 1~0.088mm, 15~18wt% The periclase-magnesia-aluminum spinel composite material whose particle size is less than 0.088mm, 15~20wt% magnesia and 3~5wt% magnesia-alumina spinel are mixed to obtain a mixture, and the mixture 3~ 5wt% sulfurous acid pulp waste liquor, stirred evenly, and machine-pressed under a pressure of 180-250MPa. The molded body is dried at 110°C for 8-24 hours, and finally fired at 1550-1650°C for 4-9 hours to obtain periclase-magnesia-alumina-spinel refractories for cement rotary kilns.

[0021] In this embodiment: the phase composition of the periclase-magnesium al...

Embodiment 2

[0024] A periclase-magnesia-alumina-spinel refractory material for cement rotary kiln and its preparation method: 17-19wt% of periclase-magnesia-alumina-spinel composite material with a particle size of 5-3mm, 32-34wt% % of periclase-magnesium aluminum spinel composite material with a particle size of 3~1mm, 16~18wt% of periclase-magnesium aluminum spinel composite material with a particle size of 1~0.088mm, 18~22wt% The periclase-magnesia-alumina-spinel composite material whose particle size is less than 0.088mm, the magnesia of 10~15wt% and the magnesium-alumina spinel of 2~4wt% are mixed to obtain a mixture, and the mixture is added with 4~ 6wt% magnesium chloride aqueous solution, stirred evenly, and machine-pressed under the pressure of 150~200MPa. The molded body is dried at 110°C for 10-30 hours, and finally fired at 1500-1600°C for 9-15 hours to obtain periclase-magnesia-aluminum spinel refractories for cement rotary kilns.

[0025] In this embodiment: the phase compo...

Embodiment 3

[0028] A periclase-magnesia-alumina-spinel refractory material for a cement rotary kiln and a preparation method thereof: 35-40wt% of a periclase-magnesia-alumina-spinel composite material with a particle size of 3-1mm, 30-35wt% Periclase-magnesium-aluminum spinel composite materials with a particle size of 1~0.088mm, 15~20wt% of periclase-magnesium-aluminum spinel composite materials with a particle size of less than 0.088mm, 4~10wt% Magnesia and 0.5-3wt% magnesium-aluminum spinel are mixed to obtain a mixture, and 1-3wt% magnesium chloride aqueous solution and 2-5wt% sulfurous acid pulp waste liquid are added to the mixture and stirred evenly. Under the machine press molding. The molded green body is dried at 110°C for 20-36 hours, and finally fired at 1520-1620°C for 6-10 hours to obtain periclase-magnesia-aluminum-spinel refractories for cement rotary kilns.

[0029] In this embodiment: the phase composition of the periclase-magnesium aluminum spinel composite material is...

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Abstract

The invention relates to a periclase-magnesium aluminate spinel refractory material for a rotary cement kiln and a preparation method thereof. according to the technical scheme, 75-95wt% of periclase-magnesium aluminate spinel composite material, 4-20wt% of magnesite and 0.5-5wt% of magnesium aluminate spinel are mixed together to obtain a mixture; a binder accounting which is 3-8wt% of the mixture is added to the mixture and mixed evenly, and then the final mixture is mechanically pressed and formed; the formed blank is dried at 110 DEG C for 8-36 hours and then fired at 1500-1650 DEG C, and furthermore, heat is preserved for 4-15 hours, and finally, the periclase-magnesium aluminate spinel refractory material for the rotary cement kiln is obtained. The preparation method of the periclase-magnesium aluminate spinel refractory material for the rotary cement kiln is simple; the periclase-magnesium aluminate spinel refractory material prepared has the characteristic of controllable distribution of magnesium aluminate spinel, and also the characteristics of good coating formation property, good thermal shock resistance and high medium erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of refractories for cement rotary kilns. Specifically, it relates to a periclase-magnesia-aluminum spinel refractory material for a cement rotary kiln and a preparation method thereof. Background technique [0002] Magnesium-chromium refractories have excellent kiln skin-hanging properties and corrosion resistance, and are widely used in the firing zone of cement rotary kilns in my country. In order to solve the Cr 6+ Public nuisance, research and development of new chrome-free refractory materials has become a hot spot in the work of refractory materials. Compared with magnesia-chromium refractories, periclase-magnesia-alumina-spinel refractories not only improve the creep resistance and thermal shock stability of the rotary kiln lining, but also maintain better stability in oxidizing or reducing atmospheres. It is one of the main varieties to replace magnesia-chromium refractories. [0003] At present,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/622C04B35/66
Inventor 鄢文陈俊峰李楠韩兵强魏耀武柯昌明
Owner WUHAN UNIV OF SCI & TECH
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