Light slightly-closed hole corundum complex-phase refractory material and preparation method thereof

A refractory material and lightweight technology, which is applied in the field of lightweight micro-closed-cell corundum composite refractory materials and their preparation, can solve the problem that the lightweight materials are difficult to meet the requirements, the slag resistance performance is very different, and the slag diffusion channels are many. problems, to achieve the effects of good thermal shock stability, improved slag resistance, and strong slag erosion resistance

Active Publication Date: 2016-01-13
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It shows that the slag resistance performance of lining materials is quite different under different smelting conditions such as slag system, slag composition, and steel type. In particular, lightweight refractory materials have more slag diffusion channels due to their lower bulk density and more pores. The slag erosion process is more complicated
This requires lightweight refractory materials to have more micro-closed pores and the ability to form a slag-resistant protective layer under a wider range of slag composition conditions, but the currently reported lightweight materials are still difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Preparation of lightweight micro-closed-cell corundum composite refractory material

[0022] 95-97 parts by weight of α-Al 2 o 3 Micropowder and 3-5 parts by weight of dolomite clinker are used as raw materials, plus 12-15 parts by weight of nano-alumina sol, dextrin of 10-15 parts by weight and ethanol of 30-40 parts by weight. The ball mill is mixed and wet-milled for 0.5-1 hour to obtain a slurry; then the slurry is placed in a mold, first placed at a room temperature of 15-25°C for 6-12 hours, and then kept at a constant temperature of 60-90°C for 6-12 hours. After 12 hours, demould; then dry the demoulded green body at 110-160°C for 24-30 hours, and keep it at 1900-2000°C for 2-4 hours to obtain light micro-closed-cell corundum composite phase refractory material.

[0023] The lightweight micro-closed-cell corundum composite refractory material prepared in this example is tested: the bulk density is 2.75-2.85g / cm 3 ; Closed porosity accounts for more...

Embodiment 2

[0024] Example 2: Preparation of lightweight micro-closed-cell corundum composite refractory material

[0025] 95-97 parts by weight of α-Al 2 o 3 Micropowder and 3 to 5 parts by weight of dolomite clinker are used as raw materials, plus 12 to 15 parts by weight of nano-alumina sol, 5 to 10 parts by weight of starch and 40 to 50 parts by weight of polyvinyl alcohol. The planetary ball mill was mixed and wet-milled for 0.1-0.6 hours to obtain a slurry; then the slurry was placed in a mold, first placed at a room temperature of 15-25°C for 6-12 hours, and then kept at a constant temperature of 60-90°C for 6 ~12 hours, demould; then dry the demoulded green body at 150-200°C for 30-36 hours, and keep it at 1800-1900°C for 3-5 hours to obtain light micro-closed-cell corundum complex phase refractories.

[0026] The lightweight micro-closed-cell corundum composite refractory material prepared in this example is tested: the bulk density is 2.80-2.88g / cm 3 ; Closed porosity accoun...

Embodiment 3

[0027] Example 3: Preparation of lightweight micro-closed-cell corundum composite refractory material

[0028] 95-97 parts by weight of α-Al 2 o 3 Micropowder and 3-5 parts by weight of dolomite clinker are used as raw materials, plus 8-12 parts by weight of nano-alumina sol, 10-15 parts by weight of chitin and 30-40 parts by weight of tert-butanol, Use a planetary ball mill to mix and wet grind for 0.5-1 hour to obtain a slurry; then put the slurry in a mold, first place it at room temperature of 15-25°C for 6-12 hours, and then keep it at a constant temperature of 60-90°C 6-12 hours, demould; then dry the demoulded green body at 110-160°C for 24-30 hours, and keep it at 1900-2000°C for 2-4 hours to obtain light micro-closed-cell corundum Composite refractories.

[0029] The lightweight micro-closed-cell corundum composite refractory material prepared in this example is tested: the bulk density is 2.80-2.85g / cm 3 ; Closed porosity accounts for more than 56% of the total p...

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Abstract

The invention provides a light slightly-closed hole corundum complex-phase refractory material and a preparation method thereof. The refractory material is prepared by conducting mixing and wet grinding to obtain slurry with, by weight, 95-99 parts of alpha-Al2O3 and 1-5 parts of doloma as raw materials and, by weight, 2-15 parts of nanometer alumina sol, 5-15 parts of saccharide polymers and 30-50 parts of organic alcohol as additives, placing the slurry in a mold for 6-12 hours under the temperature of 15-25 DEG C, placing the mold at the temperature of 60-90 DEG C, keeping the temperature for 6-12 hours, conducting demolding, drying a blank obtained after demolding for 24-36 hours under the condition that the temperature is 110-200 DEG C, keeping the temperature for 2-5 hours under the condition that the temperature is 1800-2000 DEG C, and obtaining the light slightly-closed hole corundum complex-phase refractory material. The invention further discloses the preparation method of the light slightly-closed hole corundum complex-phase refractory material. The light slightly-closed hole corundum complex-phase refractory material has the advantages of being low in volume density, small in average pore size, high in closed porosity, low in heat conductivity, high in thermal shock resistance, resistant to flushing and high in slag corrosion resistance.

Description

technical field [0001] The invention relates to a corundum refractory material and a preparation method thereof, in particular to a light micro-closed-cell corundum composite refractory material and a preparation method thereof. Background technique [0002] Steel is the foundation of national industry, and ladles are important equipment for storing, transporting and refining molten steel. Almost all new steel types are developed through secondary refining in ladles. The refractory material is not only a furnace lining material, but also participates in the metallurgical process. It is one of the important sources of non-metallic inclusions and harmful elements in steel, and is also the main channel for energy consumption in the steel smelting process. Therefore, refractories have become a key link in the modern iron and steel smelting process. [0003] At present, the damage of refractory materials is mainly manifested as slag corrosion damage. Compared with other refracto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10
CPCC04B35/101C04B35/111C04B38/0645C04B2111/00431C04B2111/0087C04B2235/321C04B2235/5436C04B2235/5445C04B2235/5454C04B2235/606C04B2235/6567C04B2235/77C04B2235/9669C04B38/0061C04B38/0074C04B38/0054C04B38/067C04B2235/3217C04B2235/602
Inventor 顾华志黄奥付绿平张美杰李楠
Owner WUHAN UNIV OF SCI & TECH
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