Preparation method of magnesia-alumina-spinel high-grade thermal-insulation material

A technology of magnesia-aluminum spinel and thermal insulation materials, which is applied in the field of preparation of magnesia-alumina spinel advanced thermal insulation materials, can solve the problems of high volume density, high thermal conductivity, poor thermal insulation performance, etc., and achieve low volume density , small thermal conductivity and high porosity

Inactive Publication Date: 2016-05-11
HUNAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The bulk density of the magnesia-aluminum spinel thermal insulation material prepared by the above research is relatively large (greater than 0.8g / cm 3 ), so the thermal conductivity is high, and the thermal insulation performance is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A preparation method of a magnesium-aluminum spinel-based high-grade thermal insulation material, comprising 65-70 parts by mass of white corundum fine powder, 15-20 parts by mass of fused magnesia and 12.5-15 parts by mass of ρ-Al 2 o 3 as raw material, co-milled in a ball mill for 3 hours, and mixed uniformly to obtain a raw material powder; add 45 to 48 parts by mass of clean water, 1.5 parts by mass of green body strengthening agent and 0.1 part by mass of hydration control agent, and mix uniformly to obtain a raw material slurry body; weigh an appropriate amount of foaming liquid, and use a high-speed mixer to foam for 3 to 5 minutes to obtain foam; add the foam to the raw material slurry, the calibrated volume is about 2 times that of the raw material slurry and mix evenly, pour into shape, and after drying Fire at 1650°C for 5 hours.

[0015] The volume density of the magnesia-aluminum spinel high-grade insulation material prepared in this embodiment is about 0....

Embodiment 2

[0017] A preparation method of a magnesium-aluminum spinel-based high-grade thermal insulation material, comprising 65-70 parts by mass of white corundum fine powder, 15-20 parts by mass of fused magnesia and 15-17.5 parts by mass of ρ-Al 2 o 3 as raw material, co-milled in a ball mill for 3 hours, and mixed uniformly to obtain a raw material powder; add 48 to 52 parts by mass of clean water, 2 parts by mass of green body strengthening agent and 0.15 part by mass of hydration control agent, and mix uniformly to obtain a raw material slurry body; Weigh an appropriate amount of foaming liquid, use a high-speed mixer to foam for 3 to 5 minutes, and make foam; add the foam to the raw material slurry, the calibrated volume is about 2.5 times the raw material slurry and mix evenly, pour into shape, and after drying Fire at 1600°C for 5 hours.

[0018] The volume density of the magnesia-aluminum spinel high-grade thermal insulation material prepared in this example is about 0.4g / cm ...

Embodiment 3

[0020] A preparation method of a magnesium-aluminum spinel-based high-grade thermal insulation material, comprising 65-70 parts by mass of white corundum fine powder, 20-25 parts by mass of fused magnesia and 12.5-15 parts by mass of ρ-Al 2 o 3 as raw material, co-milled in a ball mill for 3 hours, and mixed uniformly to obtain a raw material powder; add 48 to 52 parts by mass of clean water, 2 parts by mass of green body strengthening agent and 0.15 part by mass of hydration control agent, and mix uniformly to obtain a raw material slurry body; weigh an appropriate amount of foaming liquid, use a high-speed mixer to foam for 3 to 5 minutes, and make foam; add an appropriate amount of foam to the raw material slurry, the calibrated volume is about 2 times the raw material slurry and mix evenly, cast and dry After that, it is fired at 1600°C for 3 hours.

[0021] The volume density of the magnesia-aluminum spinel high-grade insulation material prepared in this embodiment is ab...

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Abstract

The invention relates to a preparation method of a magnesia-alumina-spinel high-grade thermal-insulation material, which comprises the following steps: by using 56-71.8 parts by mass of white alundum fine powder, 15-28.2 parts by mass of fused magnesite and 12.5-17.5 parts by mass of rho-Al2O3 as raw materials, carrying out co-grinding in a ball grinder for 1-5 hours to obtain raw material powder; adding 37-52 parts by mass of water solution containing 2-5 parts by mass of additional component to obtain raw material slurry; weighing a right amount of 1 wt% foaming solution, and foaming for 3-5 minutes by using a high-speed stirrer to obtain foam; and adding the foam into the raw material slurry, calibrating the volume, stirring uniformly, carrying out cast forming, drying, and firing by keeping the temperature at 1550-1650 DEG C for 3-6 hours. The particle size of white alundum fine powder is 180 meshes; the particle size of the fused magnesite is 200 meshes; and the additional component comprises a billet reinforcer containing one or more of polyvinyl alcohol, calcium lignosulphonate and starch, and a rho-Al2O3 hydration control agent containing one or more of sodium carbonate, sodium hexametaphosphate, sodium tripolyphosphate and lithium carbonate.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, and in particular relates to a preparation method of a magnesium-aluminum spinel high-grade thermal insulation material. Background technique [0002] The thermal insulation, energy saving and consumption reduction of high temperature kilns and thermal equipment have always been highly concerned by people. Insulation materials for medium and high temperature (below 1500°C) kilns and thermal equipment include lightweight clay bricks, anorthite lightweight insulation bricks, lightweight high alumina bricks, lightweight silica bricks and lightweight mullite bricks. Stone bricks, etc., but the advanced insulation materials used for high temperature and ultra-high temperature kilns and thermal equipment above 1500 °C are currently mainly (polycrystalline) alumina (zirconium) refractory fibers and alumina (zirconium) hollow ball bricks. Although (polycrystalline) alumina (zirconiu...

Claims

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Application Information

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IPC IPC(8): C04B35/443C04B35/634C04B35/636C04B35/63C04B38/10
CPCC04B35/443C04B35/6303C04B35/634C04B35/63416C04B35/636C04B38/106C04B2235/5436C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615
Inventor 张欣李沅铮
Owner HUNAN UNIV OF SCI & TECH
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