Lightweight heat-insulating fire brick and preparation method thereof

A technology of lightweight heat insulation and refractory bricks, which is applied to ceramic products, other household appliances, household appliances, etc., can solve the problems of poor heat insulation performance, low strength of heat insulation refractory materials, and poor thermal damage resistance, etc., to achieve Reduce pulverization, reduce energy consumption, and have good thermal shock stability

Inactive Publication Date: 2014-04-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of low strength, poor heat insulation performance, poor thermal damage resistance and easy pulverization in use of the existing heat insulation refractory materials in the prior art, and provides a kind of strength at least 4MPa, and the thermal shock resistance performance reaches More than 5 times, light-weight heat-insulating refractory brick and its preparation method that reduce pulverization during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A light-weight heat-insulating refractory brick, its raw materials and weight percentage content are: plastic hollow balls with a particle size of 2-0.5mm: 3%, clay powder with a particle size of ≤0.088mm: 85%; high-alumina particles with a particle size of ≤0.088mm Bauxite powder: 6.5%, kyanite powder with particle size ≤0.1mm: 4%, bentonite: 1%, aluminum dihydrogen phosphate: 0.4%, sodium tripolyphosphate: 0.1%.

[0027] Preparation steps:

[0028] 1) First mix 3% of plastic hollow spheres with a particle size of 2~0.5mm, 0.4% of aluminum dihydrogen phosphate and 1% of bentonite, and let stand for 0.5 hours;

[0029] 2) Mix the mixture in step 1) with 85% of clay powder, 6.5% of high alumina bauxite powder, 4% of kyanite powder and 0.1% of sodium tripolyphosphate, and digest for 22 hours;

[0030] 3) Add lignosulfonate and 6% water according to 2% of the total weight percentage of the total raw material mixture added and mix evenly; press molding;

[0031] 4) Dry at...

Embodiment 2

[0034] A light-weight heat-insulating refractory brick, its raw materials and weight percentage content are: plastic hollow balls with a particle size of 2-0.5mm: 15%, clay powder with a particle size of ≤0.088mm: 76%; high-alumina powder with a particle size of ≤0.088mm Bauxite powder: 0%, kyanite powder with particle size ≤0.1mm: 3.5%, bentonite: 3%, aluminum dihydrogen phosphate: 2.45%, sodium tripolyphosphate: 0.05%.

[0035] Preparation steps:

[0036] 1) First mix 15% of plastic hollow spheres with a particle size of 2~0.5mm, 2.45% of aluminum dihydrogen phosphate and 3% of bentonite, and let stand for 1 hour;

[0037] 2) Mix the mixture in step 1) with clay powder 76%, kyanite powder 3.5% and sodium tripolyphosphate 0.05, and digest for 24 hours;

[0038] 3) According to 0.3% of the total weight percentage of the total raw material mixture added, add lignosulfonate and 5% water and mix evenly; press molding;

[0039] 4) Dry at 115°C for 21 hours, then burn at 1300°C f...

Embodiment 3

[0042] A light-weight heat-insulating refractory brick, its raw materials and weight percentage content are: floating beads in fly ash with a particle size of 2-0.5mm: 10%, clay powder with a particle size of ≤0.088mm: 3%; particle size ≤0.088 mm high alumina bauxite powder: 74.7%, kyanite powder with particle size ≤0.1mm: 6%, bentonite: 2.3%, aluminum dihydrogen phosphate: 3.5%, sodium tripolyphosphate: 0.5%.

[0043] Preparation steps:

[0044] 1) First mix 10% of floating beads, 3.5% of aluminum dihydrogen phosphate and 2.3% of bentonite in fly ash with a particle size of 2~0.5mm, and let it stand for 0.6 hours;

[0045] 2) Mix the mixture in step 1) with clay powder 3%, kyanite powder 3.5%, high alumina bauxite powder 74.7% and sodium tripolyphosphate 0.5%, and digest for 24.5 hours;

[0046] 3) According to 0.1% of the total weight percentage of the total raw material mixture added, add lignosulfonate and 7% water and mix evenly; press molding;

[0047] 4) Dry at a temp...

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Abstract

The invention discloses a lightweight heat-insulating fire brick comprising the following raw materials in percentage by weight: 3%-15% of plastic hollow balls or floating beads in fly ash, 3%-90% of clay powder, 0-90% of bauxite powder, 3%-8% of kyanite powder, 1%-4% of bentonite, 0-5% of aluminum dihydrogen phosphate and 0.01%-0.5% of sodium tripolyphosphate. The preparation method of the lightweight heat-insulating fire brick comprises the steps of firstly, mixing the plastic hollow balls or the floating beads in fly ash with the aluminum dihydrogen phosphate and the bentonite, and standing; then, adding the clay powder, the bauxite powder, the kyanite powder and the sodium tripolyphosphate, mixing and performing decomposition; adding lignosulfonate the weight of which accounts for 0.1%-2% of the total weight of the total raw material mixture and water the weight of which accounts for 5%-9% of the total weight of the total raw material mixture, and mixing; performing compression molding; and drying and firing. The strength of the lightweight heat-insulating fire brick disclosed by the invention is not lower than 4MPa after the brick is dried at 110 DEG C for 24 hours, the air-cooled thermal shock resistance stability of the brick is good at 1000 DEG C, the lightweight heat-insulating fire brick does not generate large cracks and damages for at least 5 times, the probability of chalking in use is reduced, and the brick is favorable for reducing energy consumption.

Description

technical field [0001] The invention relates to a refractory brick and a preparation method thereof, in particular to a light-weight heat-insulating refractory brick mainly used in blast furnace hot air pipe system refractory materials, heating furnaces and soaking furnaces and a preparation method thereof. Background technique [0002] In the heating furnace used in the steel industry, a large number of lightweight clay bricks and high alumina bricks are used in the piping system of the blast furnace hot blast stove. Due to the pressure of the gas, the impact force and the long-term load, they are easily deformed and crushed. Ordinary lightweight clay-based and high-alumina bricks are formed by sintering clay, which has low strength, poor thermal damage resistance, and is easy to be damaged during use. [0003] After searching, the patent literature with the Chinese patent application number CN201010587287.4 was found, which disclosed a composition of lightweight refractory...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B38/06C04B38/00
Inventor 徐国涛鲁婷周旺枝张洪雷
Owner 武汉钢铁有限公司
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