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Aluminum-chrome-magnesium refractory brick and preparing method thereof

A refractory brick, aluminum-chromium-magnesia technology, applied in the field of refractory materials, can solve the problems of high impurity content of waste magnesia bricks, unstable product quality, and affecting the service life of kilns, etc., and achieve low porosity and excellent corrosion resistance Sex and thermal shock stability, high strength effect

Active Publication Date: 2019-08-27
RUITAI MATERIALS TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, after the use of aluminum-chrome bricks, part of the trivalent chromium is converted into toxic and carcinogenic hexavalent chromium, polluting the environment
[0003] CN102603325A discloses a regenerated magnesia-aluminum-chrome brick and a preparation method thereof, which uses aluminum-chromium slag and waste magnesia bricks as raw materials, is cheap and solves the problem of environmental pollution, but the waste magnesia bricks contain many impurities and the quality of raw materials is not good. Uniformity, resulting in unstable product quality and affecting the overall service life of the kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The raw material formula is expressed in mass percentage as follows: 3-1mm sub-white corundum 26%, 2-1mm aluminum-magnesium spinel 15%, 1-0.088mm aluminum-magnesium spinel 10%, 1-0.088mm 17% aluminum-chromium composite material, 32% aluminum-chromium composite material 3 ; The preparation process of Al-Cr-Mg refractory bricks includes: a. According to the above formula, weigh 3-1mm sub-white corundum, 2-1mm Al-Mg spinel, 1-0.088mm Al-Mg spinel and 1-0.088mm Add the aluminum-chrome synthetic material to a wet mill for mixing, then add a binder and mix for 12 minutes, and finally add 3 , apparent porosity 14.9%, normal temperature compressive strength 72.3MPa, thermal shock stability 1100°C water cooling 5 times, load softening temperature T 0.6% 1700℃, Cr 2 o 3 The content is 7.35%.

Embodiment 2

[0031] In terms of mass percentage, the formula is as follows: 3-1mm sub-white corundum 15%, 2-1mm aluminum-magnesium spinel 25%, 1-0.088mm aluminum-magnesium spinel 8%, 1-0.088mm aluminum Chromium synthetic material 16%, 3 The preparation process of aluminum-chromium-magnesia refractory bricks includes:

[0032] a. Weigh 3-1mm sub-white corundum, 2-1mm aluminum-magnesium spinel, 1-0.088mm aluminum-magnesium spinel and 1-0.088mm aluminum-chromium synthetic material and add them to a wet mill for mixing, and then add the combined Mix and grind for 10 minutes, and finally add 3 , apparent porosity 14.5%, normal temperature compressive strength 76.2MPa, thermal shock stability 1100°C water cooling 5 times, load softening temperature T 0.6% / ℃1700, Cr 2 o 3 The content is 7.8%.

Embodiment 3

[0034]For the production of colored industrial aluminum-chromium-magnesia refractory bricks, the formula expressed in mass percentage is: 10% of sub-white corundum with a particle size of 3-1mm, 30% of aluminum-magnesium spinel with a particle size of 2-1mm, and 1-0.088mm Al-Mg spinel 6%, 1-0.088mm aluminum-chromium synthetic material 20%, 3 ; The preparation process of aluminum-chromium-magnesia refractory bricks includes: a. First, weigh various raw materials according to the above-mentioned proportions, first weigh 3-1mm sub-white corundum, 2-1mm and 1-0.088mm aluminum-magnesium spinel Stone, 1-0.088mm aluminum-chromium synthetic material is added to a wet mill for mixing, then a binder is added and mixed for 10 minutes, and finally the 3 , apparent porosity 13.9%, normal temperature compressive strength 84.9MPa, thermal shock stability 1100°C water cooling 4 times, load softening temperature T 0.6% / ℃1700, Cr 2 o 3 The content is 8.1%.

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Abstract

The invention discloses an aluminum-chrome-magnesium refractory brick for glass industries and nonferrous industries and a preparing method of the aluminum-chrome-magnesium refractory brick. The aluminum-chrome-magnesium refractory brick is prepared from, by mass percentage, 10-30% of sub-white corundum with the particle size of 1-3 mm, 10-35% of aluminum magnesium spinel with the particle of 1-2mm, 5-15% of aluminum magnesium spinel with the particle size of 0.088-1 mm, 10-25% of an aluminum-chrome composite material with the particle size of 0.088-1 mm and 25-40% of an aluminum-chrome composite material with the particle size of 0.088 or below. Besides, a binding agent which accounts for 2-7% of the total mass of all the raw materials is added. By means of the prepared aluminum-chrome-magnesium refractory brick, the pollution of hexavalent chromium in residual bricks is reduced, and the problem of shortage of aluminum-chrome raw materials is solved. The aluminum-chrome-magnesium refractory brick has the advantages of being stable in production and preparation process, high in manufacturing yield, and excellent in erosion resistance and thermal shock stability, and can achieve agreat effect when applied to thermal storage chambers of glass kilns or rotary kilns for the nonferrous industries.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an aluminum-chrome-magnesia refractory brick and a preparation method thereof. Background technique [0002] At present, basic refractory materials such as magnesia-chrome bricks are still mainly used in the regenerators of glass melting furnaces and some non-ferrous industrial furnaces. However, in some cases, the kiln material or slag is neutral or even slightly acidic, and the erosion resistance of alkaline refractories is not ideal. For example, when petroleum coke is used in a glass kiln, the sulfur-alkali ratio of the kiln material is high because some petroleum coke contains high sulfur. Another example is that the slag of some zinc oxide volatilization kilns is neutral. At this time, the life of using neutral refractory materials such as aluminum chrome bricks is better than that of magnesia chrome bricks. However, this brings up two problems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/105C04B35/622
CPCC04B35/105C04B35/622C04B2235/3217C04B2235/3222C04B2235/77C04B2235/96C04B2235/9607
Inventor 徐琳琳王杰曾徐如林胡建辉尹超男闫昕王俊涛周严敦刘锡俊
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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