CN111763076A - Chromium-free unburned brick for RH insertion tube and preparation method thereof - Google Patents

Chromium-free unburned brick for RH insertion tube and preparation method thereof Download PDF

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CN111763076A
CN111763076A CN202010566462.5A CN202010566462A CN111763076A CN 111763076 A CN111763076 A CN 111763076A CN 202010566462 A CN202010566462 A CN 202010566462A CN 111763076 A CN111763076 A CN 111763076A
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equal
granularity
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powder
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李长江
赵现华
张义先
尹斌
金钊
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Haicheng Lier Maige Xita Material Co ltd
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    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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    • C04B2235/402—Aluminium
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    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
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Abstract

The invention relates to a chromium-free unburned brick for an RH insertion tube and a preparation method thereof, wherein the chromium-free unburned brick comprises the following raw materials in parts by weight: 10-15 parts of 98 electric melting magnesia-alumina spinel with the granularity being more than 1mm and less than or equal to 3 mm; 25-30 parts of 98 electric melting magnesia with the granularity more than 0 and less than or equal to 1 mm; 15-20 parts of 98 electric melting magnesia with granularity being more than 1mm and less than or equal to 3 mm; 10-15 parts of 98 electric melting magnesia with the granularity being more than 3mm and less than or equal to 5 mm; 20-25 parts of 98-fused magnesite 200-mesh fine powder; 3-5 parts of tabular corundum superfine powder; 1-1.5 parts of aluminum powder; 1-1.5 parts of silicon powder; 2-4 parts of active desilicated zirconium superfine powder; 1-3 parts of titanium dioxide; 2-4 parts of a binding agent. The advantages are that: the harm of hexavalent chromium to the environment and a human body is effectively solved without adding chromium-containing raw materials, meanwhile, the high temperature resistance, the abrasion resistance, the stripping resistance and the thermal shock resistance of the unburned brick for the RH insertion tube are ensured, and the service life of the RH insertion tube is prolonged.

Description

Chromium-free unburned brick for RH insertion tube and preparation method thereof
Technical Field
The invention relates to a chromium-free unburned brick for an RH insertion tube and a preparation method thereof.
Background
One of the most important devices in the external refining technology of steel is an RH refining furnace, which carries out secondary refining on molten steel by adopting a vacuum method, and can improve the quality of the molten steel and reduce the industrial cost. The most important refractory part of the RH refining furnace is a dip pipe, namely an insert pipe. The existing RH insert tube refractory material is generally made of high-grade sintered compact magnesia-chrome brick. The magnesium-chromium refractory material has certain excellent performance, but hexavalent chromium generated in the production process has harm to the environment and a human body, so that the development of a chromium-free refractory material to replace the existing chromium-containing refractory material is urgently needed.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide the chromium-free unburned brick for the RH insertion tube and the preparation method thereof, which effectively solve the problem of harm of hexavalent chromium to the environment and a human body. The unburned bricks are used for replacing the burnt magnesia-chrome bricks, so that the production cost is reduced, and the harm to the environment and the human body is reduced.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a chromium-free unburned brick for an RH insert pipe comprises the following raw materials in parts by weight:
10-15 parts of 98 electric melting magnesia-alumina spinel with the granularity being more than 1mm and less than or equal to 3 mm; 25-30 parts of 98 electric melting magnesia with the granularity more than 0 and less than or equal to 1 mm; 15-20 parts of 98 electric melting magnesia with granularity being more than 1mm and less than or equal to 3 mm; 10-15 parts of 98 electric melting magnesia with the granularity being more than 3mm and less than or equal to 5 mm; 20-25 parts of 98-fused magnesite 200-mesh fine powder; 3-5 parts of tabular corundum superfine powder; 1-1.5 parts of aluminum powder; 1-1.5 parts of silicon powder; 2-4 parts of active desilicated zirconium superfine powder; 1-3 parts of titanium dioxide; 2-4 parts of a binding agent.
The granularity of the plate-shaped corundum superfine powder is 325 meshes.
The binder is a phenolic resin.
A preparation method of a chromium-free unburned brick for an RH insert pipe comprises the following steps:
1) crushing, screening and fine grinding of raw materials:
crushing 98 fused magnesia in a crusher to obtain 200-mesh fine powder with granularity of more than 0 mm and less than or equal to 1mm, granularity of more than 1mm and less than or equal to 3mm, granularity of more than 3mm and less than or equal to 5 mm;
2) premixing:
premixing plate corundum superfine powder, aluminum powder, silicon powder, active desiliconized zirconium superfine powder, titanium dioxide and a part of 98-fused magnesia with the granularity of more than 0 and less than or equal to 1mm according to a proportion;
3) mixing:
firstly, 98 fused magnesia with the granularity of more than 3mm and less than or equal to 5mm, 98 fused magnesia with the granularity of more than 1mm and less than or equal to 3mm and the rest 98 fused magnesia with the granularity of more than 0 and less than or equal to 1mm are dry-mixed for more than or equal to 3min, then a bonding agent is added and mixed for 3-5 min, the premix obtained in the step 2) and the fine powder of the 98 fused magnesia with 200 meshes are added, mixed and stirred for 20-25 min, and then the mixture is discharged;
4) and (3) mechanical pressing and forming:
molding by using a 1000-ton brick molding press, wherein the density of a molded body is more than or equal to 3.32g/cm3；
5) And (3) heat treatment:
the drying kiln is more than or equal to 200 ℃, and the heat treatment time is more than or equal to 12 hours.
Compared with the prior art, the invention has the beneficial effects that:
the chromium-free unburned brick for the RH insertion tube effectively solves the harm of hexavalent chromium to the environment and a human body without adding chromium-containing raw materials, simultaneously ensures the high temperature resistance, wear resistance, stripping resistance and thermal shock resistance of the unburned brick for the RH insertion tube, and prolongs the service life of the RH insertion tube. The unburned bricks are used for replacing the burnt magnesia-chrome bricks, so that the production cost is reduced, and the harm to the environment and the human body is reduced.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A chromium-free unburned brick for an RH insert pipe comprises the following raw materials in parts by weight:
10-15 parts of 98 electric melting magnesia-alumina spinel with the granularity being more than 1mm and less than or equal to 3 mm; 25-30 parts of 98 electric melting magnesia with the granularity more than 0 and less than or equal to 1 mm; 15-20 parts of 98 electric melting magnesia with granularity being more than 1mm and less than or equal to 3 mm; 10-15 parts of 98 electric melting magnesia with the granularity being more than 3mm and less than or equal to 5 mm; 20-25 parts of 98-fused magnesite 200-mesh fine powder; 3-5 parts of tabular corundum superfine powder; 1-1.5 parts of aluminum powder; 1-1.5 parts of silicon powder; 2-4 parts of active desilicated zirconium superfine powder with the granularity of 325 meshes; 1-3 parts of titanium dioxide; 2-4 parts of a binding agent, wherein the binding agent is phenolic resin.
A preparation method of a chromium-free unburned brick for an RH insert pipe comprises the following steps:
1) crushing, screening and fine grinding of raw materials:
crushing 98 fused magnesia in a crusher to obtain 200-mesh fine powder with granularity of more than 0 mm and less than or equal to 1mm, granularity of more than 1mm and less than or equal to 3mm, granularity of more than 3mm and less than or equal to 5 mm;
2) premixing:
premixing plate corundum superfine powder, aluminum powder, silicon powder, active desiliconized zirconium superfine powder, titanium dioxide and a part of 98-fused magnesia with the granularity of more than 0 and less than or equal to 1mm according to a proportion;
3) mixing:
firstly, 98 fused magnesia with the granularity of more than 3mm and less than or equal to 5mm, 98 fused magnesia with the granularity of more than 1mm and less than or equal to 3mm and the rest 98 fused magnesia with the granularity of more than 0 and less than or equal to 1mm are dry-mixed for more than or equal to 3min, then a bonding agent is added and mixed for 3-5 min, the premix obtained in the step 2) and the fine powder of the 98 fused magnesia with 200 meshes are added, mixed and stirred for 20-25 min, and then the mixture is discharged;
4) and (3) mechanical pressing and forming:
molding by using a 1000-ton brick molding press, wherein the density of a molded body is more than or equal to 3.32g/cm3；
5) And (3) heat treatment:
the drying kiln is more than or equal to 200 ℃, and the heat treatment time is more than or equal to 12 hours.
The physicochemical indexes of the chromium-free unburned brick for the finished RH insert pipe are shown in Table 1.
Table 1: physical and chemical indexes of finished brick
Item Detecting the index
MgO，％ 82.50
SiO2，％ 1.02
Al2O3，％ 9.94
ZrO2，％ 2.84
TiO2，％ 1.54
Apparent porosity of% 4.35
Bulk density, g/cm3 3.30
Compressive strength at room temperature, MPa 50
Thermal shock (950 ℃ × 3 air cooling), secondary ＞70
Example (b):
the raw materials of the chromium-free unburned brick for the RH insert pipe are shown in Table 2.
Table 2: EXAMPLES 1-5 preparation of chromium-free unburned brick for RH insert pipe
Figure BDA0002548009980000031
Figure BDA0002548009980000041
The embodiment is a preparation method of a non-fired low-chromium magnesium composite brick,
1) crushing, screening and fine grinding of raw materials:
crushing 98 electric smelting magnesite in a crusher to obtain 200 mesh fine powder with granularity of 0-1mm, 1-3mm, 3-5mm and 200 mesh. Superfine corundum powder, aluminum powder, silicon powder, superfine active desiliconized zirconium powder and titanium dioxide for later use.
EXAMPLES indices of raw materials are shown in Table 3
Table 3: examples 1-5 main raw material index units: wt.%
Figure BDA0002548009980000042
2) Premixing:
the 98 electric smelting magnesium with the granularity of 0-1mm of sand is divided into two parts. Firstly, premixing tabular corundum superfine powder, aluminum powder, silicon powder, active desiliconized zirconium superfine powder, titanium dioxide and a part of 98-fused powder with the thickness of 0-1 mm;
3) mixing:
firstly adding 98 electric melting magnesia with the granularity of 3-5mm, 1-3mm and the rest part of 0-1mm, dry mixing for more than or equal to 3min, then adding a binding agent phenolic resin, mixing for 3-5 min, adding 200 meshes of premix and 98 electric melting magnesia, mixing for 20-25 min, and then discharging.
4) Machine pressing forming
Molding by using a 1000-ton brick molding press, wherein the density of a molded body is more than or equal to 3.32g/cm3。
5) Thermal treatment
The temperature of the drying kiln is more than or equal to 200 ℃, and the heat treatment time is more than or equal to 12 hours.

Claims (4)

1. The chromium-free unburned brick for the RH insert pipe is characterized by comprising the following raw materials in parts by weight:
10-15 parts of 98 electric melting magnesia-alumina spinel with the granularity being more than 1mm and less than or equal to 3 mm; 25-30 parts of 98 electric melting magnesia with the granularity more than 0 and less than or equal to 1 mm; 15-20 parts of 98 electric melting magnesia with granularity being more than 1mm and less than or equal to 3 mm; 10-15 parts of 98 electric melting magnesia with the granularity being more than 3mm and less than or equal to 5 mm; 20-25 parts of 98-fused magnesite 200-mesh fine powder; 3-5 parts of tabular corundum superfine powder; 1-1.5 parts of aluminum powder; 1-1.5 parts of silicon powder; 2-4 parts of active desilicated zirconium superfine powder; 1-3 parts of titanium dioxide; 2-4 parts of a binding agent.
2. The chromium-free unburned brick for the RH insert pipe according to claim 1, wherein the plate-like corundum ultrafine powder has a particle size of 325 mesh.
3. The chromium-free unburned brick for RH insert pipes according to claim 1, wherein the binder is a phenolic resin.
4. The method for preparing chromium-free unburned brick for RH insert pipes according to any one of claims 1-3, characterized by comprising the steps of:
1) crushing, screening and fine grinding of raw materials:
crushing 98 fused magnesia in a crusher to obtain 200-mesh fine powder with granularity of more than 0 mm and less than or equal to 1mm, granularity of more than 1mm and less than or equal to 3mm, granularity of more than 3mm and less than or equal to 5 mm;
2) premixing:
premixing plate corundum superfine powder, aluminum powder, silicon powder, active desiliconized zirconium superfine powder, titanium dioxide and a part of 98-fused magnesia with the granularity of more than 0 and less than or equal to 1mm according to a proportion;
3) mixing:
firstly, 98 fused magnesia with the granularity of more than 3mm and less than or equal to 5mm, 98 fused magnesia with the granularity of more than 1mm and less than or equal to 3mm and the rest 98 fused magnesia with the granularity of more than 0 and less than or equal to 1mm are dry-mixed for more than or equal to 3min, then a bonding agent is added and mixed for 3-5 min, the premix obtained in the step 2) and the fine powder of the 98 fused magnesia with 200 meshes are added, mixed and stirred for 20-25 min, and then the mixture is discharged;
4) and (3) mechanical pressing and forming:
molding by using a 1000-ton brick molding press, wherein the density of a molded body is more than or equal to 3.32g/cm3；
5) And (3) heat treatment:
the drying kiln is more than or equal to 200 ℃, and the heat treatment time is more than or equal to 12 hours.
CN202010566462.5A 2020-06-19 2020-06-19 Chromium-free unburned brick for RH insertion tube and preparation method thereof Withdrawn CN111763076A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116283327A (en) * 2023-03-10 2023-06-23 安徽瑞泰新材料科技有限公司 Alumina-silica refractory brick containing corundum ultrafine powder and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116283327A (en) * 2023-03-10 2023-06-23 安徽瑞泰新材料科技有限公司 Alumina-silica refractory brick containing corundum ultrafine powder and preparation method thereof

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