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Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof

A refractory material, a technology of magnesia-aluminum spinel, is applied in the field of aluminum-spinel-magnesia composite refractory material and its preparation, and can solve the problems of replacing magnesia-chromium refractory material, high use cost, poor slag resistance and the like, Achieve the effect of improving slag resistance, reducing pollution and reducing energy consumption

Active Publication Date: 2012-08-15
江苏诺明高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above chromium-free refractory materials cannot completely replace magnesium-chromium refractory materials in industry due to poor slag resistance, high cost of use or pollution to molten steel.

Method used

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  • Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof
  • Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof
  • Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh the required raw materials according to the ratio in Table 1, first stir the raw materials with a particle size > 0.088mm at 50r / min for 5min, add half of the inorganic binder at 50r / min and stir for 5min, and mix the raw material fine powder with a particle size of ≤0.088mm at 50r / min Min and stir for 5 minutes, add the remaining inorganic binder and continue to stir at 50r / min for 10min, stop stirring to fully trap the stirred mixture, then press the trapped mixture on a press with a pressure of 150MPa to become a standard size brick, and finally put The molded refractory material is obtained by heat treatment between 300°C and 600°C.

[0030] Table 1 Sample ratio (w)

[0031]

[0032] The heat-treated samples were tested for conventional physical and chemical properties such as apparent porosity (GB / T2997-2000), bulk density (GB / T2997-2000), and room temperature compressive strength (GB / T3997.2-1998). The test results are shown in Table 2.

[0033] Table 2...

Embodiment 2

[0036] Make a cylindrical crucible with a diameter of 50mm and a depth of 50mm in the center of the samples 1-2, 1-3, and 1-4 of Example 1, put 10g of steel slag in it, put it in a tunnel kiln at 1700°C for 3 hours, and cool it naturally to room temperature . The steel slag of the sample is the steel slag refined by RH, and the chemical composition of the steel slag is (W): Al 2 o 3 42.2%, CaO 37.6%, MgO 7.35%, SiO 2 5.67%, Fe 2 o 3 1.53%, Na 2 0 0.13%, K 2 O0.14%, TiO 2 0.14%; m(CaO) / m(SiO 2 )≈7.5. Slices of the samples after the test are shown in figure 2 As shown, the three crucibles all maintain good shape, the erosion and penetration of slag are not serious, and the slag resistance is good.

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Abstract

The invention belongs to the field of refractory, and discloses an aluminum-spinel-magnesia composite refractory as well as a preparation method and an application thereof. The aluminum-spinel-magnesia composite refractory comprises a raw material and an additional inorganic binding agent, wherein the raw material comprises the following components by weight: 60-94% of magnesia, 5-30% of magnesium-rich spinel or magnesium-aluminum spinel and 1-15% of metal aluminum powder, and the inorganic binding agent is 1-5% of the raw material. The aluminum-spinel-magnesia composite refractory is mainly used for substituting for magnesite-chrome bricks in an RH refining surface. The refractory can be thermally prepared at low temperature, so that energy consumption in the preparation process is lowered and the environmental pollution is reduced; and in the using process, part of the added aluminum powder is oxidized and forms a CA2 protective layer together with the calcium oxide in the slag so that the anti-slag permeability is improved.

Description

technical field [0001] The invention belongs to the field of refractory materials, and relates to an aluminum-spinel-magnesia composite refractory material and a preparation method and application thereof. Background technique [0002] During the global financial crisis, the world economy has undergone profound changes. In order to maintain a competitive advantage, various countries are speeding up the adjustment of economic structure, strengthening their research and development capabilities, and paying more attention to resources, energy and the environment. As a high-energy and resource-consuming industry, refractory materials are more closely related to energy efficiency, energy conservation and environmental protection in high-temperature industries. With the recent intensification of some environmental problems (such as Zijin Mining), people have further enhanced their awareness of environmental protection. [0003] In the RH refining furnace, the lining is subjected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/622
Inventor 马国栋钱志明黄京衡高原马礼涛洪珊珊李进宝王丽君
Owner 江苏诺明高温材料股份有限公司
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