Periclase-calcium-containing spinel brick for cement rotary kiln burning zone and preparation method thereof

A technology of cement rotary kiln and calcium spinel, which is applied in the field of periclase-calcium spinel bricks used in the firing zone of cement rotary kiln and its preparation field, which can solve the problems of poor sticking and hanging kiln skin and achieve good The effect of sticking to the kiln skin, improving the service life, and excellent sticking to the kiln skin

Active Publication Date: 2013-12-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Magnesia spinel brick has the advantages of good thermal shock stability and corrosion resistance to alkali, chlorine and sulfur. The problem of poor performance of hanging kiln skin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0015] The preparation method of the calcium-containing spinel is as follows: first co-grind 55-75wt% alumina raw material, 20-40wt% magnesia raw material and 1-10wt% raw dolomite, dry, knead, Extruded into a green body; then keep the green body at 110-200°C for 12-48 hours, put it into a high-temperature kiln, and calcinate it at 1600-1850°C, and then crush the calcined product to obtain calcium-containing tips spar.

[0016] Both the MgO content of the fused magnesia and the sintered magnesia are ≥95wt%.

Embodiment 1

[0018] A periclase-calcium-containing spinel brick for the firing zone of a cement rotary kiln and its preparation method: first, 60-70wt% of sintered magnesia and 30-40wt% of calcium-containing spinel are used as raw materials, mixed, Then add 2~4wt% pulp waste liquid of the above raw materials, knead, shape, bake, and then keep warm at 1500~1600°C for 2~4 hours to obtain the periclase-containing Calcium spinel bricks.

[0019] The particle gradation of sintered magnesia in this embodiment is: the particle size is 5-0.088mm, accounting for 25-32wt% of the raw material, and the particle size is less than 0.088mm, accounting for 35-38wt% of the raw material.

[0020] The gradation of calcium-containing spinel particles in this embodiment is: the particle size is 5-0.088 mm, accounting for 15-20 wt% of the raw material, and the particle size is less than 0.088 mm, accounting for 15-20 wt% of the raw material.

[0021] The forming in this embodiment is machine press forming, and...

Embodiment 2

[0024] A periclase-calcium-containing spinel brick for the firing zone of a cement rotary kiln and its preparation method: first, 70-80wt% fused magnesia and 20-30wt% calcium-containing spinel are used as raw materials, and mixed , and then add 3~5wt% pulp waste liquid of the raw material, knead, shape, bake, and then keep warm for 3~5 hours under the condition of 1600~1650°C to obtain periclase for cement rotary kiln firing belt- Calcium spinel bricks.

[0025] The particle gradation of the fused magnesia in this embodiment is: the particle size is 5-0.088 mm, accounting for 32-40 wt% of the raw material, and the particle size is less than 0.088 mm, accounting for 38-40 wt% of the raw material.

[0026] The gradation of calcium-containing spinel particles in this embodiment is: the particle size is 5-0.088 mm, accounting for 10-15 wt% of the raw material, and the particle size is less than 0.088 mm, accounting for 10-15 wt% of the raw material.

[0027] The forming in this e...

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Abstract

The invention in particular relates to a periclase-calcium-containing spinel brick for a cement rotary kiln burning zone and a preparation method thereof. The preparation method is characterized by firstly mixing 60-95wt% of magnesia and 5-40wt% of calcium-containing spinel as raw materials, then adding pulp waste liquid accounting for 2-5wt% of the raw materials, mulling, forming and baking the materials and then insulating the product at 1500-1800 DEG C for 2-5 hours, thus obtaining the periclase-calcium-containing spinel brick for the cement rotary kiln burning zone. A preparation method of calcium-containing spinel is characterized by firstly grinding 55-75wt% of raw material aluminium oxide, 20-40wt% of raw material magnesium oxide and 1-10wt% of raw dolomite together, drying and mixing the powder and extruding the mixture into a green body; then insulating the green body at 110-200 DEG C for 12-48 hours, putting the green body in a high temperature kiln to be calcined at 1600-1850 DEG C and then breaking the product after calcination, thus obtaining calcium-containing spinel. The periclase-calcium-containing spinel brick prepared by the preparation method has excellent performance of sticking to kiln coatings and prolongs the service lives of refractory materials.

Description

technical field [0001] The invention belongs to the technical field of periclase-calcium-containing spinel bricks, and in particular relates to a periclase-calcium-containing spinel brick for a firing zone of a cement rotary kiln and a preparation method thereof. Background technique [0002] The sticking performance of the kiln skin is an important operational performance of the refractories used in the firing belt of the cement rotary kiln. The heat insulation effect brought by the kiln skin with an appropriate thickness on the surface of the refractory brick can effectively reduce the temperature gradient between the surface temperature of the refractory brick and the inside of the brick, and reduce the damage to the refractory brick caused by the thermal stress inside the brick. At the same time, the existence of the kiln skin can also effectively reduce the cement Chemical attack of clinker on refractory bricks. The stable adhesion of the kiln skin on the surface of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 顾华志罗琼孙光思
Owner WUHAN UNIV OF SCI & TECH
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