Finegrained aluminium-chromium composite fireproof materials

A refractory raw material, fine-grained technology, applied in the field of new refractory raw materials, can solve the problems of difficult control of physical and chemical performance indicators, product chemical composition fluctuations, long smelting time, etc., to achieve easy control of the process and improve performance/ Price ratio, effect of improving erosion resistance

Active Publication Date: 2004-11-17
RUITAI MATERIALS TECHNOLOGY CO LTD
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AI Technical Summary

Problems solved by technology

The disadvantage of this technique is that although the zirconia and the intruded calcia react preferentially, since the alumina and zirconia particles are independently dispersed in the refractory
The main disadvantage of this technology is that the aluminum-zirconium composite raw material is produced by a slow cooling method, and the grain size is relatively large
The smelting time is long, the power consumption is high, the chemical composition of the product fluctuates, and the physical and chemical performance indicators are difficult to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0029] The ratio of raw materials is: 173kg of desiliconized zirconium, 228kg of industrial alumina, and 9kg of magnesia powder with MgO97%. %, produce the aluminum-zirconium composite raw material in the same manner as embodiment 1. The alumina and zirconia in the raw material are evenly mixed, the primary crystal size is about 2-4 μm, the material that cannot be crushed by compressed air is reduced from 25% in Example 1 to 10%, and the yield of the product has been greatly improved. After this kind of raw material is added to the magnesia-aluminum spinel brick at a dosage of 3%, the thermal shock resistance can be increased by 30-50%.

[0030] The main advantages of the invention are: small crystal grains, moderate chemical purity, low price, fast melting speed and convenient preparation. The raw material is used to prepare periclase-magnesia aluminum spinel material, which can significantly improve the thermal shock resistance, thermal conductivity and kiln skin hanging pr...

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PUM

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Abstract

The invention relates to a novel fire-resistant raw material for preparing periclasite magnesium aluminate spinel fireproof material and high grade fusion-cast AZS fireproof material whose formulation is, desiliconisation zirconium 30-73%, commercial alumina 27%-70%, magnesite 0-10%, wherein the content of zirconium dioxide in desiliconisation zirconium is 85-92%, the content of magnesium oxide in magnesite is 97%, the total content of magnesium oxide in the formulation is 0.2-10%, the total content of silicon oxide is 0.5-1.5%, the total content of zirconium oxide is 30-60%, the total content of alumina is 30-65%. The raw material can be used to prepare periclasite-magnesium aluminate spinel material with substantial improvement on heat and shock resistance, thermal conductivity.

Description

1 technical field [0001] The invention is a new type of refractory raw material for preparing periclase magnesium aluminum spinel refractory material and advanced casting AZS refractory material. 2 background technology [0002] 2.1 Periclase magnesium aluminum spinel material [0003] The use of magnesium-chromium materials will produce hexavalent chromium substances that are highly toxic, carcinogenic and seriously pollute the environment. Thus, periclase-magnesia aluminum spinel refractories have been developed. [0004] In the first generation of periclase (M) magnesium aluminum spinel (MA) material, Al was added during brick making 2 o 3 , the organization of MA-M matrix-bound M particles was generated by an in situ reaction. The performance of refractory bricks is poor due to the formation of MA accompanied by a volume change of about 10%. The second-generation spinel bricks are added with pre-synthesized MA particles to form an M matrix combining MA and M particl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/109C04B35/484
Inventor 王杰曾袁林刘锡俊曾鲁举王志武
Owner RUITAI MATERIALS TECHNOLOGY CO LTD
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