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Method for preparing ceramic liner of continuous melting furnace for high-purity alumina, and continuous melting furnace

A high-purity alumina, ceramic liner technology, applied in the direction of alumina/aluminum hydroxide, etc., can solve the problem that the liner material cannot meet the use, and achieve the effect of high overall reliability, uniform microstructure and high strength

Inactive Publication Date: 2013-11-20
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no ceramic liner type high-purity alumina continuous melting technology with a temperature exceeding 2000 ° C. The main reason is that the key liner material cannot meet the requirements of the application.

Method used

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  • Method for preparing ceramic liner of continuous melting furnace for high-purity alumina, and continuous melting furnace
  • Method for preparing ceramic liner of continuous melting furnace for high-purity alumina, and continuous melting furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 95% hafnium diboride powder with a particle size of less than 2 μm, 4% aluminum oxide with a particle size of less than 1 μm, and 1% carbon powder, and mix it with a phenolic resin solution with an alcohol content of 50% at a ratio of 100:10 Mix evenly, dry at 80°C and make 100μm granulated powder, isostatically press at a pressure of 150Mpa and keep the pressure for 30 minutes to make high-purity alumina ceramics for continuous melting furnace The inner biscuit bell is then demoulded and fired at 2000°C for 2 hours to make a bell with a wall thickness of 5mm, an outer diameter of the upper cylinder of ?200mm, a height of 500mm, an outer diameter of the lower cylinder of ?30mm, and a height of 50mm Ceramic liner for high-purity alumina continuous melting furnace.

[0015] The purity of the batching raw materials used in the experiment is industrial pure.

Embodiment 2

[0017] Mix 89% of hafnium diboride powder with a particle size of less than 2 μm, 8% of aluminum oxide with a particle size of less than 1 μm, and 3% of carbon powder, and mix it with a phenolic resin solution with an alcohol content of 50% at a ratio of 100:10 Mix evenly, dry at 80°C and make 200μm granulated powder, press isostatic pressing under pressure of 150Mpa and keep the pressure for 30 minutes to make high-purity alumina ceramic inner for continuous melting furnace The biscuit is then demolded and fired at 1800°C for 2.5 hours to make a high-purity steel with a wall thickness of 15mm, an outer diameter of the upper cylinder of ?150mm, a height of 300mm, an outer diameter of the lower cylinder of ?25mm, and a height of 40mm. Ceramic liner for alumina continuous melting furnace.

[0018] The purity of the batching raw materials used in the experiment is industrial pure.

Embodiment 3

[0020] Mix 78% of hafnium diboride powder with a particle size of less than 2 μm, 17% of aluminum oxide with a particle size of less than 1 μm, and 5% of carbon powder, and mix it with a phenolic resin solution with an alcohol content of 50% at a ratio of 100:10 Mix evenly, dry at 80°C and make 300μm granulated powder, isostatically press at a pressure of 150Mpa and hold the pressure for 30 minutes to press into high-purity alumina ceramic inner for continuous melting furnace The biscuit is then demolded and fired at 1600°C for 3 hours to make a high-purity steel with a wall thickness of 20mm, an outer diameter of the upper cylinder of 50mm and a height of 50mm, an outer diameter of the lower cylinder of 22mm and a height of 30mm. Ceramic liner for alumina continuous melting furnace.

[0021] The purity of the batching raw materials used in the experiment is industrial pure.

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Abstract

The invention discloses a method for preparing a ceramic liner of a continuous melting furnace for high-purity alumina, and the continuous melting furnace. The continuous melting furnace for the high-purity alumina is characterized by consisting of a cooling water jacket furnace shell 1, a carbon fiber insulation material 2, a ceramic liner seat 3, a graphite heater 4, the ceramic liner 5, a feeding nozzle 6, a furnace body upper cover 7, an upper cooling cavity 8, a hearth 9, a lower cooling cavity 10 and a furnace body lower cover 11, wherein the cooling water jacket furnace shell is a cooling water jacket; and the ceramic liner of the continuous melting furnace for the high-purity alumina is a compounding material prepared from combined aluminum nitride and hafnium boride obtained through reactive sintering, the using temperature is 1,600 to 2,200 DEG C, and the atmosphere is the argon atmosphere. The prepared ceramic liner for the continuous melting furnace for the high-purity alumina and the continuous melting furnace have the characteristics of uniform microstructure, high intensity, high integral reliability, high oxidation resistance, capacity of continuously producing the high-purity alumina, and high production efficiency and the like, do not pollute high-purity alumina melt and can be used at the temperature of 2,200 DEG C for a long time.

Description

technical field [0001] The invention relates to a ceramic liner for a high-purity alumina continuous melting furnace, which belongs to the technical field of structural ceramic preparation. Background technique [0002] At present, alumina melting is mainly used in the production of alumina hollow spheres, and the melting temperature is about 1900°C due to the addition of low-temperature flux. At present, there is no ceramic liner type high-purity alumina continuous melting technology with a temperature exceeding 2000 ° C. The main reason is that the key liner material cannot meet the requirements. Contents of the invention [0003] The object of the present invention is to provide a kind of preparation method that can overcome above-mentioned defect, realize the ceramic liner of high-purity alumina continuous melting furnace. Its technical solution is: [0004] High-purity alumina continuous melting furnace is composed of cooling water jacket furnace shell (1), carbon f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/58C04B35/622C01F7/02
Inventor 唐竹兴周倩张颖
Owner SHANDONG UNIV OF TECH
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