Corundum-spinel refractory brick and preparation method thereof

A technology of spinel and refractory bricks, applied in the field of corundum-spinel refractory materials, can solve the problem of reducing the sintering performance and slag erosion resistance of corundum-spinel refractory materials, and increasing the corundum-spinel refractory The development cost of stone refractory materials, reducing the high-temperature strength of corundum-spinel refractory materials, etc., achieve the effects of saving labor resources, improving slag erosion resistance, and low cost

Inactive Publication Date: 2017-06-20
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the large difference in thermal expansion coefficient between corundum and spinel (or spinel formed by in-situ reaction), corundum-spinel refractories are prone to produce a large number of microcracks during the firing process, making it difficult to sinter densely, thereby greatly reducing the The sintering performance and slag erosion resistance of corundum-spinel refractory materials; at the same time, the impurity components in the raw material components are easy to form low-melting point phases and enriched in the grain boundaries, resulting in weak bonding between the corundum phase and the spinel phase grain boundary , which reduces the high temperature strength of corundum-spinel refractories; in addition, tabular corundum, spinel and α-Al 2 o 3 The cost of other raw materials is high, which increases the development cost of corundum-spinel refractories

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A corundum-spinel refractory brick and a preparation method thereof. The preparation method described in this embodiment is:

[0029] With 58-60wt% brown corundum particles as aggregate, 23-25wt% aluminum-magnesium spinel fine powder, 15-17wt% lightly burned magnesium powder, 1-1.4wt% aluminum powder and 1-3wt% The iron red powder is the base material; first mix the base material, then add the aggregate, mix for 5-8 minutes, and then add 3-5wt% of the base material and the aggregate The thermosetting phenolic Resin, mixed for 10-15 minutes, machine-pressed, cured at 200-250°C for 12-18 hours; finally placed in a muffle furnace, heated to 1500-1600°C under a nitrogen atmosphere, and kept for 2-3 hours , cooling with the furnace to produce corundum-spinel refractory bricks.

[0030] The corundum-spinel refractory brick prepared in this example is measured: the bulk density is 3.15-3.17g / cm 3 ; 1400 ℃ × 3h static crucible method anti-slag test erosion index is 1 ~ 3%; h...

Embodiment 2

[0032] A corundum-spinel refractory brick and a preparation method thereof. The preparation method described in this embodiment is:

[0033] With 57-59wt% brown corundum particles as aggregate, 22-24wt% aluminum-magnesium spinel fine powder, 16-18wt% lightly burned magnesium powder, 1.2-1.6wt% aluminum powder and 1-3wt% The iron red powder is the base material; first mix the base material, then add the aggregate, mix for 5-8 minutes, and then add 3-5wt% of the base material and the aggregate The thermosetting phenolic Resin, mixed for 10-15 minutes, machine-pressed, cured at 200-250°C for 12-18 hours; finally placed in a muffle furnace, heated to 1500-1600°C under a nitrogen atmosphere, and kept for 2-3 hours , cooling with the furnace to produce corundum-spinel refractory bricks.

[0034] The corundum-spinel refractory brick prepared in this example is measured: the bulk density is 3.16-3.18g / cm 3 ; 1400 ℃ × 3h static crucible method anti-slag test erosion index is 1 ~ 3%;...

Embodiment 3

[0036] A corundum-spinel refractory brick and a preparation method thereof. The preparation method described in this embodiment is:

[0037] With 56-58wt% brown corundum particles as aggregate, 21-23wt% aluminum-magnesium spinel fine powder, 17-19wt% lightly burned magnesium powder, 1.4-1.8wt% aluminum powder and 2-4wt% iron red powder as the base material; first mix the base material, then add the aggregate, mix for 5 to 8 minutes, and then add thermosetting phenolic aldehyde accounting for 4 to 6 wt% of the sum of the base material and the aggregate Resin, mixed for 10-15 minutes, machine-pressed, cured at 200-250°C for 12-18 hours; finally placed in a muffle furnace, heated to 1500-1600°C under a nitrogen atmosphere, and kept for 2-3 hours , cooling with the furnace to produce corundum-spinel refractory bricks.

[0038] The corundum-spinel refractory brick prepared in this example is measured: the bulk density is 3.17~3.19g / cm 3 ; 1400 ℃ × 3h static crucible method anti-...

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Abstract

The invention relates to a corundum-spinel refractory brick and a preparation method thereof. The corundum-spinel refractory brick comprises 55 to 60% by weight of brown fused alumina particles as aggregates, 20 to 25% by weight of aluminum-magnesium spinel fine powder as a base material, 15 to 20% by weight of caustic calcined magnesite powder as a base material, 1 to 2% by weight of aluminum powder as a base material and 1 to 4% by weight of iron powder as a base material. The preparation method comprises uniformly mixing the base materials, adding the aggregates into the base materials, mixing the mixture for 5 to 8 minutes, adding 3 to 6 wt% of thermosetting phenolic resin into the base materials and aggregates, mixing the mixture for 10 to 15 minutes, carrying out mechanical pressing molding, carrying out maintenance at a temperature of 200-250 DEG C for 12 to 18 hours, putting the molded material into a muffle furnace, carrying out heating to 1500-1600 DEG C under nitrogen atmosphere conditions, carrying out thermal insulation for 2 to 3 hours, and carrying out furnace cooling to obtain the corundum-spinel refractory brick. The preparation method has the characteristics of low cost and simple processes. The corundum-spinel refractory brick has high sintered density, large high temperature flexural strength and strong anti-slag erosion resistance.

Description

technical field [0001] The invention belongs to the technical field of corundum-spinel refractory materials. Specifically relates to a corundum-spinel refractory brick and a preparation method thereof. Background technique [0002] Corundum-spinel refractories refer to refractory materials with corundum and spinel as the main phase. Since corundum and spinel have high melting points and stable chemical properties, corundum-spinel Refractory materials have excellent characteristics such as high temperature resistance, strong chemical corrosion resistance and strong resistance to oxidation-reduction atmosphere changes, and are widely used in high-temperature industrial fields such as metallurgy and building materials. [0003] At present, corundum-spinel refractories mainly use platy corundum or sintered corundum as aggregates, and spinel fine powder, α-Al 2 o 3 Micropowder and magnesia fine powder are used as the matrix, and pulp waste liquid or sol is used as the binder. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101C04B35/622
CPCC04B35/101C04B35/622C04B2235/3206C04B2235/3222C04B2235/3272C04B2235/402C04B2235/656C04B2235/658C04B2235/77C04B2235/96C04B2235/9669
Inventor 张寒周艳焰林诗艺赵惠忠李静捷余俊
Owner WUHAN UNIV OF SCI & TECH
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