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Preparation method of magnesium aluminate spinel brick

A magnesia-alumina spinel brick and magnesia-alumina spinel technology, applied in the field of refractory materials, can solve the problem of weakening the load softening temperature and thermal shock stability of magnesia-alumina spinel bricks, low thermal strength at high temperature, and thermal shock stability In order to achieve the effects of low production cost, low change rate of refiring line and high thermal shock stability

Active Publication Date: 2016-08-10
江苏诺明高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesia-alumina spinel bricks are widely used in industrial kilns due to their advantages of good corrosion resistance, abrasion resistance and slag resistance. However, the magnesium-alumina spinel bricks prepared by existing technical methods often have high temperature Defects such as low strength and poor thermal shock stability
Although some performance defects of the material can be made up for through technical improvement: for example, the strength of the material can be improved by introducing additives to promote sintering and densification, but the introduction of additives leads to the formation of high-temperature liquid phase of the material, which weakens the magnesia-aluminum spinel brick. The load softening temperature and thermal shock stability; for example, the introduction of carbon-containing or other non-oxide additives can promote densification and improve the thermal shock stability and strength of the product, but the magnesium-aluminum tip prepared by this method Spar bricks are not suitable for use in neutral / oxidative atmosphere conditions, and the presence of non-oxide components makes the structure and performance of the working lining rapidly decline with the prolongation of working time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In the first step, calculated by mass percentage, 20wt% of magnesia particles (with a particle size of 1-3mm), 70wt% of corundum fine powder (with a particle size of <0.088mm), and the remainder supplemented by the binder aluminum dihydrogen phosphate, Mix evenly and granulate according to the proportion. After heat treatment at 1500-1700℃ for 1 hour, the obtained material is sieved according to the particle size. mm is material B (including 1mm, excluding 3mm, the same below).

[0018] In the second step, 10wt% magnesia fine powder (particle size<0.088mm), 50wt% corundum fine powder (particle size<0.088mm), 30wt% magnesium aluminum spinel fine powder (particle size<0.088mm) , the balance is made up with the binder silica sol, mixed evenly, pressed and formed under the condition of 100-120 MPa, and then heat-treated at 1300-1500°C for 5 hours, and then the material was crushed, ground, and sieved to obtain a particle size of 1 -0.088mm (including 1mm and 0.088mm, the s...

Embodiment 2

[0023] In the first step, 35wt% of magnesia particles, 64wt% of corundum fine powder, and the balance are supplemented with silica sol, mixed evenly, granulated, heat treated at 1500-1600°C for 5 hours, and sieved to obtain a particle size of 5- A material with a particle size of 3 mm and a B material with a particle size of 3-1 mm.

[0024] In the second step, 20-30 wt% magnesia fine powder, 40-50 wt% corundum fine powder, 10-20 wt% magnesium aluminum spinel fine powder, 5-10 wt% aluminum dihydrogen phosphate Mix evenly in proportion, press and form at 100-150 MPa, heat treat at 1400-1600°C for 1-5 hours, crush, grind, and sieve to obtain C materials with a particle size of 1-0.088 mm and a particle size of less than 0.088 mm mm of D material.

[0025] In the third step, 5-10 wt% of A material, 5-10 wt% of B material, 10-20 wt% of C material, 20-30 wt% of D material, 10-20 wt% of magnesium aluminum tip Spar fine powder, 1-5 wt% magnesia fine powder, 1-5 wt% corundum fine po...

Embodiment 3

[0029] In the first step, in terms of mass percentage, 40wt% of magnesia particles, 55wt% of corundum fine powder, and the balance are supplemented with aluminum dihydrogen phosphate, mixed evenly, granulated, and heat treated at 1600-1700°C for 3 hours. Sieve to obtain material A with a particle size of 5-3 mm and material B with a particle size of 3-1 mm.

[0030] In the second step, 25-30 wt% of magnesia fine powder, 30-40 wt% of corundum fine powder, 20-30 wt% of magnesium aluminum spinel fine powder, and 5-10 wt% of silica sol are proportionally Mix evenly, press and form under the condition of 100-150 MPa, heat treatment at 1300-1500°C for 1-5 hours, crush, grind and sieve to obtain C materials with a particle size of 1-0.088 mm and C materials with a particle size of less than 0.088 mm D material.

[0031] In the third step, 5-10 wt% of A material, 5-10 wt% of B material, 10-20 wt% of C material, 20-30 wt% of D material, 10-20 wt% of magnesium aluminum tip Spar fine p...

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Abstract

The invention provides a preparation method of a magnesium aluminate spinel brick, wherein the preparation method comprises the specific steps: A, mixing evenly magnesia particles, a corundum fine powder and a binder, then granulating, carrying out heat treatment, and screening to obtain a material A and a material B; B, mixing a magnesia fine powder, a corundum fine powder, a magnesium aluminate spinel fine powder and a binder evenly, carrying out heat treatment, then crushing and screening to obtain a material C and a material D; C, mixing evenly the material A, the material B, the material C, the material D, a magnesium aluminate spinel fine powder, a magnesia fine powder, a corundum fine powder and a binder, and then carrying out heat treatment, to obtain the magnesium aluminate spinel brick. The method is beneficial for close contact of all kinds of raw material particles, but also makes full use of structural characteristics of materials at different temperatures; the prepared magnesium aluminate spinel brick has excellent characteristics of high room-temperature compressive strength, high thermal shock stability, high load softening temperature, and low reburning line change rate.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a preparation method of magnesia-aluminum spinel bricks. Background technique [0002] Magnesia-alumina spinel bricks are widely used in industrial kilns due to their advantages of good corrosion resistance, abrasion resistance and slag resistance. However, the magnesium-alumina spinel bricks prepared by existing technical methods often have high temperature Low strength, poor thermal shock stability and other defects. Although some performance defects of the material can be made up for through technical improvement: for example, the strength of the material can be improved by introducing additives to promote sintering and densification, but the introduction of additives leads to the formation of high-temperature liquid phase of the material, which weakens the magnesia-aluminum spinel brick. The load softening temperature and thermal shock stability; for example, the introduc...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/63C04B35/443
CPCC04B35/443C04B35/6309C04B35/6316C04B35/66C04B2235/5427
Inventor 钱志明刘成强蒋菊芳
Owner 江苏诺明高温材料股份有限公司
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