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A method for preparing high-quality calcium hexaaluminate refractory raw materials by using a two-step roasting method

A technology of calcium hexaaluminate and refractory raw materials, which is applied in the field of refractory materials, can solve problems such as waste of energy consumption, reduce the limit temperature of refractory materials, and corrosion resistance, so as to increase content, improve refractoriness and slag resistance, and prevent The effect of volume expansion

Active Publication Date: 2021-06-29
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these methods will not only bring a lot of waste of energy consumption, but also reduce the limit temperature and corrosion resistance of refractory materials due to the introduction of additives

Method used

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  • A method for preparing high-quality calcium hexaaluminate refractory raw materials by using a two-step roasting method

Examples

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Effect test

Embodiment 1

[0023] In this example, α-Al produced by an aluminum industry in Shandong is used. 2 o 3 Calcium hexaaluminate is prepared for the aluminum raw material in the whole process and high-quality limestone as calcium source. First, the limestone is crushed and ground to a particle size of 0.075mm by a crushing and grinding machine. After that limestone powder and industrial α-Al 2 o 3 The powder (particle size: 0.075 mm) was mixed according to mass percentage of 14% and 86%, respectively. After fully mixing, send the mixed powder into a high-temperature kiln for 1500°C roasting for 30 minutes and then cool. The cooled powder was pressed into a cylindrical sample with a diameter of 5 cm by a press with a pressing force of 200 MPa. Finally, the sample is sent to a high-temperature kiln for 1 hour of roasting at 1600°C and then cooled to obtain a high-quality calcium hexaaluminate refractory raw material. like figure 1 As shown, in the X-ray diffraction pattern of the calcium h...

Embodiment 2

[0026] In this example, α-Al produced by an aluminum industry in Shandong is used. 2 o 3 Calcium hexaaluminate is prepared for the aluminum raw material in the whole process and high-quality limestone as calcium source. First, the limestone is crushed and ground to a particle size of 0.075mm by a crushing and grinding machine. After that limestone powder and industrial α-Al 2 o 3 The powder (particle size: 0.075 mm) was mixed according to mass percentage of 14% and 86%, respectively. After fully mixing, send the mixed powder into a high-temperature kiln for 1500°C roasting for 30 minutes and then cool. The cooled powder was pressed into a cylindrical sample with a diameter of 2 cm by a press using a pressing force of 100 MPa. Finally, the sample is sent to a high-temperature kiln for 1 hour of roasting at 1600°C and then cooled to obtain a high-quality calcium hexaaluminate refractory raw material. In the X-ray diffraction pattern of the calcium hexaaluminate prepared in...

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Abstract

The invention belongs to the field of refractory materials, and in particular relates to a method for preparing high-quality calcium hexaaluminate refractory raw materials by using a two-step roasting method. Industrially produced α‑Al 2 o 3 As the aluminum raw material in the whole process, high-quality limestone is used as the calcium source to prepare calcium hexaaluminate, including the following steps: (1) crushing and mixing; (2) primary calcination; (3) briquette forming; (4) calcination forming. The method can produce high-quality calcium hexaaluminate refractory raw materials with high purity through a short process flow and low energy consumption.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a method for preparing high-quality calcium hexaaluminate refractory raw materials by using a two-step roasting method. Background technique [0002] High temperature resistant lightweight refractory materials have always been a key development area in the field of refractory materials. Calcium hexaaluminate not only has the characteristics of high melting point and light weight, but also has the advantages of relatively stable chemical properties, good thermal conductivity, and poor thermal expansion. Its own flaky structure also makes it have a larger surface area, which can not only effectively reduce the heat radiation loss between the reactant and the environment under high temperature conditions, but also significantly reduce the weight of the modified material itself. At the same time, due to its high The alumina content also makes it relatively resistant t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 田晨袁磊靳恩东温天朋贾丹彬刘震丽于景坤
Owner NORTHEASTERN UNIV LIAONING