Preparation method of light-weight high-strength calcium hexaluminate fire resistant material

A calcium hexaaluminate and refractory technology, applied in the field of refractory materials or porous ceramics, can solve the problems of low production efficiency, low bulk density, environmental pollution, etc., and achieve no harmful gas emissions, controllable pore size, closed porosity, etc. high effect

Active Publication Date: 2018-09-21
遵义润辉实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the preparation process of this kind of method, the burnt matter generates gas and is discharged from the inside of the material, forming mostly continuous open pores, which reduces the performance of the refractory material
At the same time, organic incineration will produce harmful gases and a large amount of CO 2 , causing pollution to the environment
Chinese patent "a high-strength calcium hexaaluminate lightweight heat insulation material and its preparation method" (CN 103496993 A), using nano-calcium carbonate and ρ-Al 2 o 3 Micropowder is the main raw material, and the method of adding alkaline foaming agent is used to prepare the calcium hexaaluminate thermal insulation material with micro-closed cell structure. The obtained material has a small volume density and good thermal insulation performance, but the process control of the foaming method is relatively complicated. , easily lead to uneven material and low production efficiency
[0004] Chinese patent "a high-strength microporous calcium hexaaluminate lightweight aggregate and its preparation method", (CN 105948772 A) uses alumina hydrate and calcium carbonate as the main raw materials, and uses alumina hydrate and calcium carbonate as raw materials in the calcining process. Calcium hexaaluminate lightweight aggregate with microporous structure was prepared by the method of site decomposition. This method has simple process and no pollution in the production process, but the chemical reaction rate is not easy to control and it is easy to crack during the calcination process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Mix 38 wt% nano-calcium carbonate and 62 wt% aluminum hydroxide, then add 90 wt% water, 0.05 wt% sodium tripolyphosphate as dispersant and 4 wt% dextrin As a binding agent, ball milled for 3 hours to obtain a mixed slurry;

[0022] (2) Spray and granulate the mixed slurry to obtain a spherical granule body;

[0023] (3) The spherical pellet body is calcined at 1100°C to obtain lightweight porous balls, and the bulk density of the porous balls is 0.63g / cm 3 , the particle size is 0.044~0.3mm;

[0024] (4) Mix 30wt% lightweight porous balls and 70wt% α-alumina fine powder (raw material particle size≦0.074mm), add 4wt% dextrin as a binder of the sum of the above raw materials, and stir evenly, 10MPa pressure compression molding, calcination under the condition of 1600 ℃ for 8 hours, to obtain high-strength and light-weight calcium hexaaluminate refractory material.

[0025] The technical indicators of the lightweight high-strength calcium hexaaluminate refractory ma...

Embodiment 2

[0028] (1) Mix 52 wt% light calcium carbonate and 48 wt% aluminum hydroxide, add 100 wt% water, 0.03 wt% sodium lignosulfonate as dispersant and 2 wt% formazan The base cellulose is used as a binding agent, and ball milled for 4 hours to obtain a mixed slurry;

[0029] (2) Spray and granulate the mixed slurry to obtain a spherical granule body;

[0030] (3) Calcining the spherical pellet body at 1150°C to obtain lightweight porous balls, the bulk density of which is 0.52g / cm 3 , the particle size is 0.044~0.3mm;

[0031] (4) Mix 22wt% lightweight porous balls, 40wt% calcined corundum fine powder (raw material particle size ≦0.074mm) and 38% industrial alumina for analysis, and add the sum of the above raw materials as a binder of methyl fiber 3wt% element, after stirring evenly, press molding under 20MPa pressure, and calcined at 1650°C for 7 hours to obtain high-strength and light-weight calcium hexaaluminate refractory material.

[0032] The technical indicators of the li...

Embodiment 3

[0035] (1) Mix 60 wt% of ordinary calcium carbonate and 40 wt% of aluminum hydroxide, add 100 wt% of water, 0.05 wt% of sodium hexametaphosphate as a dispersant and 4 wt% of sulfurous acid pulp The waste liquid is used as a binding agent, and ball milled for 5 hours to obtain a mixed slurry;

[0036] (2) Spray and granulate the mixed slurry to obtain a spherical granule body;

[0037] (3) The spherical pellet body is calcined at 1200°C to obtain lightweight porous balls, and the bulk density of the porous balls is 0.61g / cm 3 , the particle size is 0.044~0.3mm;

[0038] (4) Mix 20wt% light porous balls and 80wt% industrial alumina fine powder (raw material particle size 0.074mm), add 3wt% methyl cellulose as the binder of the sum of the above raw materials, stir well, Compressed under the condition of 15MPa, and calcined under the condition of 1650°C for 7 hours, a high-strength and light-weight calcium hexaaluminate refractory material is obtained.

[0039] The technical in...

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Abstract

The invention provides a preparation method of a light-weight high-strength calcium hexaluminate fire resistant material. The method is characterized by comprising the following steps that (1) 38-60%of calcarea carbonica raw material and 40-62% of aluminium hydroxide are mixed by weight and mixed with, by weight, 80-120% of water, 0.02-0.05% of dispersing agent and 1-4% of binding agent, and ball-milling is carried out for 3-5 hours to obtain a mixed slurry; (2) spray granulation is carried out on the mixed slurry to obtain spherical fine particles; (3) the spherical fine particles are calcined at 1000-1200 DEG C to obtain light-weight porous beads; (4) 15-30% of light-weight porous beads and 70-85% of aluminium oxide raw material are mixed by weight and mixed with 2-6% of binding agent by weight, after stirring is uniform, compression molding is carried out under 10-30 MPa, and calcination is carried out for 6-8 hours at 1600-1700 DEG C to obtain the light-weight high-strength calcium hexaluminate fire resistant material.

Description

technical field [0001] The invention belongs to the technical field of refractory materials or porous ceramics, and in particular relates to a light-weight high-strength calcium hexaaluminate refractory material and a preparation method thereof. Background technique [0002] High temperature industries are characterized by high energy consumption and high emissions. As the society attaches great importance to energy and environmental protection, reducing energy consumption, green production is the most urgent task in the current high-temperature industry. Most of the heat in high temperature industries is dissipated and lost from refractory materials. The development of heat-insulating refractory materials with low thermal conductivity, high service temperature and good high-temperature performance is the key to reducing energy consumption and emissions in high-temperature industries. CA 6 (Calcium hexaaluminate) has the excellent characteristics of high refractoriness (1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/622C04B35/626C04B38/08
CPCC04B35/44C04B35/622C04B35/6267C04B35/62695C04B35/66C04B38/085C04B2235/3208C04B2235/3217C04B2235/3218C04B2235/77C04B2235/96C04B38/0067
Inventor 赵飞葛铁柱赵华徐恩霞高金星
Owner 遵义润辉实业有限公司
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