Method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature by two-step method

A technology of magnesium-aluminum spinel and calcium hexaaluminate is applied in the field of two-step low-temperature preparation of light calcium hexaaluminate-magnesium-aluminum spinel composite refractory materials, and can solve the problems of poor product quality, high energy consumption, The problem of high firing temperature can achieve the effect of low wettability, good thermal conductivity and low solubility

Active Publication Date: 2015-10-28
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the firing temperature of this preparation method is high, the energy consumption is large, and the product quality is relatively poor, and there are still deficiencies in the prior art

Method used

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  • Method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature by two-step method
  • Method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature by two-step method
  • Method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature by two-step method

Examples

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Effect test

Embodiment 1

[0058] A method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature in a two-step method, the steps are:

[0059] Grind the dolomite and industrial aluminum hydroxide with a crushing ball until the particle size is less than 0.15mm, and mix with a certain admixture for wet co-grinding for 4 hours; the molar ratio of the starting materials is: CaO:Al 2 o 3 :MgO=1:7:1, the admixture is 20% of the raw material mass, the water-solid mass ratio is 2.17, and the operating frequency of the planetary mill is set to 20Hz; the ground slurry is autoclaved in an autoclave for 10h, and the autoclaved The temperature is 150°C, and the stirring speed is 150r / min;

[0060] Take out the autoclaved slurry, separate the solid from the liquid, dry for 40 minutes, and make pellets with a diameter of about 1 mm; dry the pellets at 110°C for 8 hours, and calcinate them at 1400°C for 3 hours in a high-temperature furnace. The heating r...

Embodiment 2

[0062] A method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature in a two-step method, the steps are:

[0063] Grind the dolomite and industrial aluminum hydroxide with a crushing ball until the particle size is less than 0.15mm, and mix with a certain admixture for wet co-grinding for 3 hours; the molar ratio of the starting materials is: CaO:Al 2 o 3 : MgO=1:7.2:1, the admixture is 20% of the raw material mass, the water-solid mass ratio is 2.07, and the operating frequency of the planetary mill is set to 20Hz; the ground slurry is autoclaved in an autoclave for 8 hours, and the autoclaved The temperature is 150°C, and the stirring speed is 150r / min;

[0064] Take out the autoclaved slurry, separate the solid from the liquid, dry for 40 minutes, and make pellets with a diameter of about 1 mm; dry the pellets at 110°C for 8 hours, and calcinate them at 1450°C for 3 hours in a high-temperature furnace, with a...

Embodiment 3

[0066] A method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory material at low temperature in a two-step method, the steps are:

[0067] Grind the dolomite and industrial aluminum hydroxide with a crushing ball until the particle size is less than 0.15mm, and mix with a certain admixture for wet co-grinding for 3 hours; the molar ratio of the starting materials is: CaO:Al 2 o 3 : MgO=1:6.9:0.8, the admixture is 20% of the raw material mass, the water-solid mass ratio is 2.11, and the operating frequency of the planetary mill is set to 20Hz; the ground slurry is autoclaved in an autoclave for 8h, autoclaved The temperature is 150° C., and the stirring speed is 150 r / min.

[0068] Take out the autoclaved slurry, filter and dry it for 40 minutes, and then make pellets with a diameter of about 1mm; dry the pellets at 110°C for 8 hours, and calcinate them at 1500°C for 3 hours in a high-temperature furnace. The heating rate is: room temper...

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Abstract

The invention discloses a method for low temperature preparation of a lightweight calcium-hexaluminate-magnesium aluminate spinel multiphase refractory material by a two step method, and the methos is characterized in that: together grinding a weighed a calcareous material, a magnesium material, an aluminum raw material and additives by wet method to prepare a slurry material; autoclaving the slurry material in an autoclave kettle; performing suction filtration on the autoclaved slurry material for solid-liquid separation, then drying, pelletizing, putting dried spheres into a high temperature furnace for calcining at 1300 to 1500 DEG C, and with the heating rate of 2 to 10 DEG C / min, performing heat insulation for 1-5h to prepare the lightweight calcium-hexaluminate-magnesium aluminate spinel multiphase refractory material. By adopting the method, the calcination temperature is reduced by more than 100 DEG C compared with a process the prior art, the energy consumption is low, the prepared multiphase refractory material has the characteristics of light weight and high strength, good heat insulation effect, and good stability in reducing atmosphere and chemical environment, and can be widely used in iron and steel industry and petrochemical industry.

Description

technical field [0001] The invention belongs to refractory materials, and relates to a method for preparing light calcium hexaaluminate-magnesium aluminum spinel composite refractory materials at low temperature in a two-step method. The light calcium hexaaluminate-magnesium aluminum spinel composite refractory material prepared by the invention is a light heat insulation refractory material and can be widely used in steel and petrochemical industries. Background technique [0002] With the rapid development of my country's economy and the increase in energy demand, energy conservation has increasingly become the subject of people's attention. Industrial kilns are the main energy-consuming equipment in industrial production, especially in the heat treatment process of metallurgy, building materials, ceramics, and chemicals. However, the heat loss of various industrial kilns at present is very large, the thermal efficiency is low, and the energy utilization rate is less than 3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/44C04B35/443C04B35/622
Inventor 严云李利平胡志华范晓正
Owner SOUTHWEAT UNIV OF SCI & TECH
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