Light weight microporous corundum aggregate and preparation method thereof

A lightweight corundum bone technology, which is applied in the field of lightweight microporous corundum aggregates and its preparation, can solve the problems of uncontrollable pore size and quantity inside the material, poor resistance to molten steel and steel slag erosion and permeability, and large amount of water added in the wet grinding process and other problems, to achieve the effect of improving thermal shock stability, good thermal shock stability, and increasing service life

Active Publication Date: 2014-07-02
浙江自立新材料股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The disadvantages of this method are: 1) The amount of water added in the wet grinding process is large, and the energy consumption in the later drying process is very large; 2) The size and number of pores inside the material are uncontrollable
[0008] The disadvantages of this method are: 1) The purity is low, and substances such as sillimanite and sintering accelerator are added. If it is used as a working lining refractory, the anti-erosion effect is poor and the service life is short; 2) The pores are introduced in the form of adding foam , so that the apparent porosity of the obtained material is too high, and the corrosion resistance and permeability of molten steel and steel slag are poor

Method used

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  • Light weight microporous corundum aggregate and preparation method thereof

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Embodiment 1～22

[0041] After the components in the raw materials are mixed evenly, the pellets are formed into balls with a diameter of 20 mm, and then kept at a certain temperature for a period of time to obtain lightweight microporous corundum aggregates.

[0042] The proportion by weight of each component in the raw material and the average particle size of each raw material are shown in Table 1, wherein, the Al in the industrial alumina fine powder used 2 O 3 The weight percentage of aluminum fine powder is ≥99%, and the aluminum fine powder is stirred in the air for 24h before use. The amount of water added into the ball, the holding temperature and the holding time are shown in Table 2. The performance of the prepared lightweight microporous corundum aggregate is shown in the table. 3 shown.

[0043] Table 1

[0044]

[0045] Table 2

[0046] Example serial number

[0047] table 3

[0048] Example serial number

[0049] Example 3

[0050] As can be see...

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PUM

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Abstract

The invention discloses light weight microporous corundum aggregate and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing components of raw materials and balling, wherein the balling water addition is 5-30%; and then, insulating for 0.5-6 hours at 1600-1950 DEG C to obtain the light weight microporous corundum aggregate. The raw materials comprise the following components in parts by weight: 55-99 parts of industrial aluminum oxide fine powder, 0-30 parts of p-Al2O3 micropowder and 1-20% of aluminum micropowder. The light weight microporous corundum aggregate provided by the invention is simple in preparation method, low in apparent porosity, lower than sintered plate corundum in volume density and high in refractoriness.

Description

technical field [0001] The invention belongs to the technical field of corundum refractory materials, and particularly relates to a lightweight microporous corundum aggregate and a preparation method thereof. Background technique [0002] With the continuous progress of iron and steel smelting technology, especially the smelting of some high-quality steel grades, higher requirements are placed on the purity of refractory materials for smelting furnaces. [0003] The ladle is an important steel container in the steelmaking process. At present, most of the refractory materials used for the ladle wall in the molten pool of the domestic ladle are carbon-free prefabricated blocks or castables. The main raw materials used are sintered tabular corundum, fused white corundum and brown corundum. Corundum. [0004] Because of the high purity of sintered tabular corundum, good thermal shock stability and mature production technology, its usage is also the largest. As the iron and ste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/10C04B35/622
Inventor 方义能王落霞沈明科程文雍方斌祥吴斌马列鹰
Owner 浙江自立新材料股份有限公司
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