AZC (alumina-zirconia-chromium sesquioxide) lattice brick, manufacturing method of AZC lattice brick and heat accumulation chamber built of AZC lattice brick

A regenerator and checker brick technology, applied in the field of regenerators, can solve the problems of shortening the service life of a glass melting furnace, speeding up the damage rate of refractory materials, eroding refractory materials, etc., and achieving a simple and easy preparation method and low apparent porosity. , the effect of improving the service life

Active Publication Date: 2015-06-10
江苏中正耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, petroleum coke will release vanadium pentoxide, sulfur, nickel oxide and other gases during combustion, which are extremely corrosive, which will not only erode refractory materials and the upper space of the glass kiln, but also significantly accelerate the damage speed of refractory materials, thus The service life of the glass melting furnace is greatly reduced

Method used

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  • AZC (alumina-zirconia-chromium sesquioxide) lattice brick, manufacturing method of AZC lattice brick and heat accumulation chamber built of AZC lattice brick

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Raw materials:

[0029] Alumina, 99.9% pure, 73%, particle size 6000 mesh; Zirconium dioxide, 99.9% pure, 10%, Chromium trioxide, 88% pure, 8%; Aluminum phosphate 10%; Carboxylic acid 3.5% Methylcellulose; 2% Rare Earth B nucleating agent.

[0030] Among the above raw materials, except for dichromium trioxide and aluminum phosphate, the rest can be purchased from outside.

[0031] (2) Preparation method:

[0032] 1. Prepare chromium trioxide: sinter the waste chromium trioxide at 1900°C for 4 hours, add 3% nano-sized alumina during the sintering process, and obtain chromium trioxide of 6000 mesh;

[0033] 2. Prepare aluminum phosphate: it is prepared from 1% phosphoric acid, 33% alumina and 66% water.

[0034] 3. After mixing all raw materials, carry out molding and pressing, drying, sintering and heat preservation in sequence to obtain AZC bricks. The sintering temperature is 1600°C, the sintering time is 55 hours, and the heat preservation time is 5 hours.

[...

Embodiment 2

[0042] (1) Raw materials:

[0043] Alumina, 99.9% pure, 70%, particle size 6000 mesh; Zirconia, 99.9% pure, 7%,; Chromium oxide, 80% pure, 6%; Aluminum phosphate 10%; Rare earth 0.3% B nucleating agent.

[0044] (2) Preparation method:

[0045] 1. Prepare chromium trioxide: sinter the waste chromium trioxide at a temperature of 1800°C for 3 hours;

[0046] 2. Prepare aluminum phosphate: it is prepared by mixing 1% phosphoric acid, 33% alumina and 66% water.

[0047] 3. After mixing all the raw materials, perform forming and pressing, drying, sintering and heat preservation in sequence to obtain AZC bricks. The sintering temperature is 1550°C, the sintering time is 48 hours, and the heat preservation time is 4 hours.

[0048] (3) Performance testing

[0049] According to the test, the apparent porosity of the brick is 16.5%, and the bulk density is 3.1g / cm 3 , The compressive strength at room temperature is 80MPa, and the softening temperature under 0.2MPa load is 1700℃.

Embodiment 3

[0051] (1) Raw materials:

[0052] 99.9% pure alumina, 75%, particle size 6000 mesh; 99.9% pure zirconia, 12%, 85% pure chromium oxide, 6%; aluminum phosphate, 12%; 2.5% carboxylate Methylcellulose.

[0053] Among the above-mentioned raw materials, except for dichromium trioxide, the rest can be purchased from outside.

[0054] (2) Preparation method:

[0055] 1. Prepare chromium trioxide: sinter the waste chromium trioxide at a temperature of 2000°C for 6 hours;

[0056] 2. After mixing all the raw materials, perform forming and pressing, drying, sintering and heat preservation in sequence to obtain AZC bricks. The sintering temperature is 1650°C, the sintering time is 60 hours, and the heat preservation time is 6 hours.

[0057] (3) Performance testing

[0058] According to the test, the apparent porosity of the brick is 16.2%, and the bulk density is 3.15g / cm 3 , The compressive strength at room temperature is 80MPa, and the softening temperature under 0.2MPa load is 1...

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Abstract

The invention discloses an AZC (alumina-zirconia-chromium sesquioxide) lattice brick, a manufacturing method of the AZC lattice brick and a heat accumulation chamber built of the AZC lattice brick. The AZC lattice brick is manufactured from the following components in percentage by weight: 70-75% of alumina, 7-12% of zirconia, 6-10% of chromium sesquioxide and 9-12% of aluminum phosphate, wherein the chromium sesquioxide is prepared by calcining waste chromium sesquioxide twice, and the chromium sesquioxide has a particle size of more than 6,000 meshes. The AZC lattice brick has quite low apparent porosity, high bulk density, high compression strength at normal temperature and high refractoriness under the load of 0.2MPa. External substances (harmful gases generated during the combustion of petroleum coke) can be prevented from intruding into the AZC lattice brick so that the organizational structures of refractory materials can be kept intact. In addition, the AZC lattice brick has strong capacity of resisting the erosion of harmful gases generated during the combustion of petroleum coke and has good creep resistance.

Description

technical field [0001] The invention relates to a refractory material, in particular to a checker brick (AZC brick) for a petroleum coke float heat storage chamber and a preparation method thereof, and also to a heat storage chamber arranged using the AZC checker brick. Background technique [0002] At present, glass melting furnaces use petroleum coke, a high-calorie fuel, to replace ordinary fuels to produce glass, which is an effective means to save energy consumption, reduce emissions, reduce manufacturing costs and improve the level of glass melting furnaces. However, petroleum coke will release vanadium pentoxide, sulfur, nickel oxide and other gases during combustion, which are extremely corrosive, which will not only erode refractory materials and the upper space of the glass furnace, but also significantly accelerate the damage speed of refractory materials, thus The service life of the glass melting furnace is greatly reduced. According to the statistics of releva...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03B18/16C03B5/43C04B35/66
Inventor 蒋优君蒋翔顾炎
Owner 江苏中正耐火材料有限公司
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