Low-carbon magnesia carbon brick with oxidation resistance and preparation method thereof

Abstract

The invention relates to the technical field of refractory materials, in particular to a low-carbon magnesia carbon brick with oxidation resistance and a preparation method thereof. The low-carbon magnesia carbon brick comprises the following components in parts by weight: 88-96 parts of fused magnesite, 1-3 parts of metal aluminum powder, 3 parts of resin, 1-3 parts of a ZrB2-Cr7C3 multi-phase material, 1-3 parts of high-temperature asphalt and 1-3 parts of -196 graphite. Through the structural design of the low-carbon magnesia carbon brick with oxidation resistance, the technical problems that in the prior art, the excellent performance of the magnesia carbon brick depends on the existence of carbon in the brick, the oxidation of the carbon easily causes the deterioration of the product structure in the use process, slag intrudes into the brick along gaps to erode MgO particles, and the service life of the MgO-C brick is shortened are solved.

Description

technical field

[0001] The invention relates to the technical field of refractory materials, in particular to a low-carbon magnesia-carbon brick with oxidation resistance and a preparation method thereof. Background technique

[0002] As a composite refractory material, magnesia carbon brick has a decisive relationship with the introduction of carbon for its excellent performance. Magnesia itself has strong corrosion resistance to alkaline slag and high-iron slag, and magnesia has super high refractoriness. However, the high temperature thermal expansion coefficient of magnesia is relatively high, resulting in poor spalling resistance and thermal shock stability of magnesia. Therefore, carbonaceous elements are introduced, and the high thermal conductivity and low expansion of the carbonaceous elements themselves are used to reduce the temperature difference of the brick body and improve the thermal shock stability of the brick body. At the same time, the wetting angle of t...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing low-carbon magnesia-carbon bricks with anti-oxidation properties as described in any one of the above, comprising the following preparation steps:

[0032] After dry mixing the fused magnesia, add resin, the speed of adding resin is 15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, after stirring, finally add metal aluminum powder and ZrB 2 -Cr 7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0033] The low-carbon magnesia-carbon brick preparation material is put into the mold, pressed and formed to obtain brick embryos;

[0034] The brick embryos are pushed into a heat treatment kiln for heat treatment to obtain low-carbon magnesia carbon bricks.

[0035] Preferably, during pressing, a 1000T electric screw press is used for pressing; during heat treatment, the temperature inside the heat treatment kiln is 180°C-2...

Embodiment 1

[0039] Preparation of low-carbon magnesia-carbon bricks with excellent oxidation resistance (sample 1):

[0040] In parts by weight, it includes 95 parts of fused magnesia, 1 part of metal aluminum powder, 3 parts of liquid phenolic resin, ZrB 2 -Cr 7 C 3 1 part of composite material, 1 part of high-temperature pitch and 2 parts of -196 graphite.

[0041] 101) According to the parts by weight, after dry mixing the fused magnesia, add liquid phenolic resin, the liquid phenolic resin is added at a rate of 10~15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, After stirring, finally add metal aluminum powder and ZrB 2 -Cr7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0042] 102) The low-carbon magnesia-carbon brick preparation material is put into the mould, pressed and formed, and the brick embryo is obtained;

[0043] 103) Push the brick embryo into a heat treatment kiln for ...

Embodiment 2

[0048] Preparation of low-carbon magnesia-carbon bricks with excellent oxidation resistance (sample 2):

[0049] In parts by weight, it includes 94 parts of fused magnesia, 1 part of metal aluminum powder, 3 parts of liquid phenolic resin, ZrB 2 -Cr 7 C 3 2 parts of composite material, 1 part of high-temperature pitch and 2 parts of -196 graphite.

[0050] 201) According to the number of parts by weight, after dry mixing the fused magnesia, add liquid phenolic resin, the liquid phenolic resin is added at a rate of 10~15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, After stirring, finally add metal aluminum powder and ZrB 2 -Cr 7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0051] 202) The low-carbon magnesia-carbon brick preparation material is put into the mould, pressed and formed to obtain the brick embryo;

[0052] 203) Push the brick embryo into a heat treatment kil...

technical field

[0001] The invention relates to the technical field of refractory materials, in particular to a low-carbon magnesia-carbon brick with oxidation resistance and a preparation method thereof. Background technique

[0002] As a composite refractory material, magnesia carbon brick has a decisive relationship with the introduction of carbon for its excellent performance. Magnesia itself has strong corrosion resistance to alkaline slag and high-iron slag, and magnesia has super high refractoriness. However, the high temperature thermal expansion coefficient of magnesia is relatively high, resulting in poor spalling resistance and thermal shock stability of magnesia. Therefore, carbonaceous elements are introduced, and the high thermal conductivity and low expansion of the carbonaceous elements themselves are used to reduce the temperature difference of the brick body and improve the thermal shock stability of the brick body. At the same time, the wetting angle of t...

Examples

preparation example Construction

[0031] The present invention also provides a method for preparing low-carbon magnesia-carbon bricks with anti-oxidation properties as described in any one of the above, comprising the following preparation steps:

[0032] After dry mixing the fused magnesia, add resin, the speed of adding resin is 15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, after stirring, finally add metal aluminum powder and ZrB 2 -Cr 7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0033] The low-carbon magnesia-carbon brick preparation material is put into the mold, pressed and formed to obtain brick embryos;

[0034] The brick embryos are pushed into a heat treatment kiln for heat treatment to obtain low-carbon magnesia carbon bricks.

[0035] Preferably, during pressing, a 1000T electric screw press is used for pressing; during heat treatment, the temperature inside the heat treatment kiln is 180°C-2...

Embodiment 1

[0039] Preparation of low-carbon magnesia-carbon bricks with excellent oxidation resistance (sample 1):

[0040] In parts by weight, it includes 95 parts of fused magnesia, 1 part of metal aluminum powder, 3 parts of liquid phenolic resin, ZrB 2 -Cr 7 C 3 1 part of composite material, 1 part of high-temperature pitch and 2 parts of -196 graphite.

[0041] 101) According to the parts by weight, after dry mixing the fused magnesia, add liquid phenolic resin, the liquid phenolic resin is added at a rate of 10~15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, After stirring, finally add metal aluminum powder and ZrB 2 -Cr7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0042] 102) The low-carbon magnesia-carbon brick preparation material is put into the mould, pressed and formed, and the brick embryo is obtained;

[0043] 103) Push the brick embryo into a heat treatment kiln for ...

Embodiment 2

[0048] Preparation of low-carbon magnesia-carbon bricks with excellent oxidation resistance (sample 2):

[0049] In parts by weight, it includes 94 parts of fused magnesia, 1 part of metal aluminum powder, 3 parts of liquid phenolic resin, ZrB 2 -Cr 7 C 3 2 parts of composite material, 1 part of high-temperature pitch and 2 parts of -196 graphite.

[0050] 201) According to the number of parts by weight, after dry mixing the fused magnesia, add liquid phenolic resin, the liquid phenolic resin is added at a rate of 10~15kg / min, then add -196 graphite, mix for 5-10min, add high temperature asphalt, After stirring, finally add metal aluminum powder and ZrB 2 -Cr 7 C 3 Composite materials, after stirring evenly, obtain low-carbon magnesia-carbon brick preparation materials;

[0051] 202) The low-carbon magnesia-carbon brick preparation material is put into the mould, pressed and formed to obtain the brick embryo;

[0052] 203) Push the brick embryo into a heat treatment kil...

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