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Calcic spinel refractory material and preparation method thereof

A refractory raw material, calcium spinel technology, applied in the field of calcium-containing spinel refractory raw materials and its preparation, can solve the problems of spinel mineral erosion, limited use, burning flow of kiln skin, etc., to reduce the contact area, Effect of improving thermal shock resistance and improving thermal shock resistance

Inactive Publication Date: 2012-09-12
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for better control over properties such as strengths, durability, etc., during production compared to traditional methods like sintered ceramics made through processes involving chemical reactions between different components that have been mixed together beforehand. By adding certain elements (Ca) to this mixture, it becomes possible to create new types of compositions called calcined spinals which contain multiple calcium atoms within their structure rather than just two ones - lithium oxide (Li2C03). These composites exhibit improved heat stability when fired under specific conditions, resulting in longer lifespan and reduced maintenance costs associated therewith.

Problems solved by technology

This patents discusses improving magnetic properties on ceramics such as MgO - Al2/3-12

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A calcium-containing spinel refractory raw material and its preparation method: first, 55~65wt% alumina raw material, 30~40wt% magnesia raw material and 1~5wt% raw dolomite are co-ground, dried, and kneaded , extruded into a green body; keep the green body at 110-200°C for 12-48 hours, then put it into a high-temperature kiln, and calcinate it at 1600-1730°C, and then crush the calcined product to obtain calcium-containing Spinel refractory raw material.

[0023] In this embodiment, the raw material of alumina is industrial alumina; the raw material of magnesia is light-burned magnesia.

[0024] The main physical properties of the calcium-containing refractory raw materials prepared in this example are: the bulk density is 2.70~3.20g / cm 3 , the apparent porosity is 5~20%, and the compressive strength is 40~70MPa; the XRD test results show that the main crystal phase is MgAl 2 o 4 , the subcrystalline phase is CaAl 4 o 7 .

Embodiment 2

[0026] A calcium-containing spinel refractory raw material and its preparation method: first, 65~75wt% alumina raw material, 20~30wt% magnesia raw material and 5~10wt% raw dolomite are co-ground, dried, and kneaded , extruded into a green body, and keep the green body at 110-200°C for 12-48 hours; then put it into a high-temperature kiln, calcined at 1730-1850°C, and then crush the calcined product to obtain calcium-containing Spinel refractory raw material.

[0027] In this embodiment, the alumina raw material is aluminum hydroxide fine powder; the magnesium oxide raw material is magnesite.

[0028] The main physical properties of the calcium-containing refractory raw materials prepared in this example are: the bulk density is 3.00~3.50g / cm 3 , the apparent porosity is 5~20%, and the compressive strength is 40~70MPa; the XRD test results show that the main crystal phase is MgAl 2 o 4 , the subcrystalline phase is CaAl 12 o 19 .

Embodiment 3

[0030] A calcium-containing spinel refractory raw material and a preparation method thereof. Except following raw material, all the other are with embodiment 1:

[0031] The alumina raw material is alumina micropowder; the magnesium oxide raw material is magnesium hydroxide.

[0032] The main physical properties of the calcium-containing refractory raw materials prepared in this example are: the bulk density is 2.70~3.20g / cm 3 , the apparent porosity is 5~20%, and the compressive strength is 40~70MPa. The XRD detection result shows that the main crystal phase is MgAl 2 o 4 , the subcrystalline phase is CaAl 4 o 7 and CaAl 12 o 19 .

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Abstract

The invention particularly relates to calcic spinel refractory material and a preparation method thereof. According to the technical scheme, the preparation method includes: firstly, subjecting 55-75wt% of aluminum oxide material, 20-40wt% of magnesium oxide material and 1-10wt% of crude dolomite to co-milling, drying, mixing and pressing to obtain a blank; and secondly, keeping the blank at 110-200 DEG C for 12-48 hours, placing the blank in a high-temperature kiln for calcining at 1600-1850 DEG C, and breaking products of calcining to obtain the calcic spinel refractory material. The calcic spinel refractory material has superior kiln coating adherence and fine high-temperature service performance, kiln coating adherence of periclase-spinel bricks on burning zone of a cement kiln can be effectively improved, and thermal shock resistance of the periclase-spinel bricks can be improved.

Description

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Claims

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Application Information

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Owner WUHAN UNIV OF SCI & TECH
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