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Preparation method of multi-morphology coexisting MgAlON refractory material for RH (Ruhrstahl Heraeus) refining furnace

A refractory material, magnesium aron technology, applied in the field of refractory materials, can solve the problems that the mechanical properties and thermal shock stability of refractory materials cannot be taken into account at the same time, so as to achieve the improvement of anti-permeability and thermal shock stability, reduce the pore diameter, and improve the The effect of thermal shock stability

Pending Publication Date: 2022-05-13
洛阳利尔功能材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Studies have shown that relative to the composite refractory matrix, the granular ceramic reinforcement plays the role of dispersion toughening, bridging cracks, etc., and improves the mechanical properties of the composite refractory; the flaky or fibrous ceramic phase can absorb and consume the energy of crack propagation to improve The purpose of thermal shock stability, while the microstructure of traditional refractory materials is mostly one or two kinds of morphology coexistence, which cannot take into account the mechanical properties and thermal shock stability of refractory materials at the same time

Method used

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  • Preparation method of multi-morphology coexisting MgAlON refractory material for RH (Ruhrstahl Heraeus) refining furnace
  • Preparation method of multi-morphology coexisting MgAlON refractory material for RH (Ruhrstahl Heraeus) refining furnace
  • Preparation method of multi-morphology coexisting MgAlON refractory material for RH (Ruhrstahl Heraeus) refining furnace

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Embodiment 1

[0017] A method for preparing a MgAlON refractory material with coexistence of multiple shapes for RH refining furnaces. Aggregate magnesia particles, matrix and magnesium aluminate sol binder with a weight percentage of 4% are uniformly mixed to form a raw material mixture, wherein the aggregate The magnesia particles are fused magnesia with a purity of 96%. The weight percentage of the magnesia particles with a particle size of 5-3mm is 11wt%, and the weight percentage of the magnesia particles with a particle size of 3-1mm is 30wt%. The weight percentage of -0mm magnesia particles is 30wt%, and the matrix is ​​metal aluminum powder with a particle size of ≤74 μm, a weight percentage of 10wt%, and a purity of 99.3% and a particle size of ≤74 μm, a weight percentage of 13wt%, and a purity of It is a mixture of 96% fused magnesia and activated alumina with a particle size of ≤5 μm, a weight percentage of 6 wt%, and a purity of 99.4%. Weigh fused magnesia particles, metal alumin...

Embodiment 2

[0019] A method for preparing a MgAlON refractory material coexisting with multi-morphology for RH refining furnaces. Aggregate magnesia particles, matrix, and binder pulp waste liquid with a weight percentage of 4.5% are uniformly mixed to form a raw material mixture, wherein the magnesium in the aggregate The sand particles are sintered magnesia with a purity of 98%: the mass percentage of magnesia particles with a particle size of 5-3mm is 12wt%, and the mass percent composition of magnesia particles with a particle size of 3-1mm is 27wt%. The mass percentage of magnesia particles with a particle size of 1-0 mm is 32 wt%, and the matrix is: metal aluminum powder with a particle size of ≤74 μm, a weight percentage of 12 wt%, a purity of 99.3%, and a particle size of ≤74 μm, a weight percentage of A mixture of sintered magnesia with a particle size of 10wt% and a purity of 98% and activated alumina powder with a particle size of ≤5 μm and a weight percentage of 7wt% and a puri...

Embodiment 3

[0021] A method for preparing a MgAlON refractory material with multiple shapes coexisting for RH refining furnaces, mixing aggregate particles, matrix, and binder phenolic resin with a weight percentage of 3.5% to form a raw material mixture, wherein the magnesia particles in the aggregate It is high-purity magnesia with a purity of 97%, and the particles are 9 wt% of magnesia particles with a particle size of 5-3mm, and 33 wt% of magnesia particles with a particle size of 3-1mm, and magnesia with a mass percentage of 1-0mm. The mass percentage of sand particles is 29 wt%, and the matrix is: metal aluminum powder with a particle size of ≤74 μm, a mass percentage of 9 wt%, and a purity of 99.3% and a particle size of ≤74 μm, a mass percentage of 12 wt%, and a purity of 97.8 % of high-purity magnesia and a mixture of activated alumina powder with a particle size of ≤5 μm, a mass percentage of 8wt%, and a purity of 99.4%, take high-purity magnesia particle raw materials and metal...

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Abstract

The invention relates to a refractory product in the field of refractory materials, in particular to a preparation method of a multi-morphology coexisting MgAlON refractory material for an RH (Ruhrstahl Heraeus) refining furnace, which comprises the following steps: by taking magnesia particles as aggregates and taking a mixture of activated alumina powder, metal aluminum powder and magnesia fine powder as a matrix, adding a binding agent, uniformly mixing, mixing, performing dry-pressing molding, and drying, thereby obtaining the multi-morphology coexisting MgAlON refractory material for the RH refining furnace. The dried green brick is put into a high-temperature furnace in a nitrogen atmosphere, heat preservation is carried out, when the furnace temperature is naturally cooled to the normal temperature, a multi-morphology coexisting magnesia-AlON refractory material product is obtained, granular, shell-shaped, sheet-shaped and fiber-shaped magnesia-AlON spinel reduces the pore diameter of pores and is distributed in a matrix in a crossed mode, permeation of steel slag is facilitated, the thermal shock resistance of the material can be improved, and the thermal shock resistance of the material is improved. The erosion resistance, the penetration resistance and the thermal shock resistance of the prepared multi-morphology coexisting magnesia-AlON refractory material are improved through the combined action of the two, the magnesia-AlON refractory material can replace a magnesite-chrome brick refractory material to be used in a key part in an RH refining furnace, and the service life of the RH refining furnace is prolonged.

Description

technical field [0001] The invention relates to refractory products in the field of refractory materials, in particular to a method for preparing magnesium aron refractory materials with coexisting multi-morphologies for RH refining furnaces. Background technique [0002] Magnesium Alon is a magnesium aluminum oxynitride compound MgAlON, which is a new type of refractory material. Magnesium Alon refractory material and MgO-Y 2 O 3 , MgO-C, MgO-ZrO 2 , MgO-CaO and other refractory materials are chromium-free refractory materials that have been studied more on RH refining furnaces. MgO-Y 2 O 3 High-quality refractories have better resistance to steel slag penetration. Compared with magnesium-chromium refractories, their anti-stripping performance is poor. In addition, Y 2 O 3 Belonging to rare earth oxides, the price is expensive and the cost of use is high; MgO-C refractories have excellent spalling resistance and steel slag erosion resistance, but due to the introducti...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/80C04B35/58C04B35/622
CPCC04B35/66C04B35/80C04B35/58C04B35/622C04B2235/3222C04B2235/524C04B2235/9607C04B2235/96
Inventor 仝尚好赵继增邵晶侯耀仲刘雷李勇
Owner 洛阳利尔功能材料有限公司
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