CN110606733A - Modified magnesia carbon brick and preparation method thereof - Google Patents
Modified magnesia carbon brick and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a modified magnesia carbon brick, which comprises the following steps: mixing magnesia, an aluminum-magnesium-calcium composite material, graphite, composite metal powder and a composite binder to obtain a mixture; forming the mixture to obtain a green body; and drying the blank to obtain the modified magnesia carbon brick. The modified magnesia-carbon brick for the high-temperature carbonization furnace is prepared by taking high-purity fused magnesia, high-purity crystalline flake graphite and an aluminum-magnesium-calcium composite phase material as main raw materials, adding composite metal powder and compounding an organic binder, has the advantages of high temperature resistance, high strength and high heat conductivity, good slag resistance, oxidation resistance, thermal shock stability and the like, and is suitable for being used for extracting titanium from blast furnace slag to smelt the lining of the water-cooled carbonization furnace. The invention also provides a modified magnesia carbon brick.
Description
Technical Field
The invention relates to the technical field of magnesia carbon bricks, in particular to a modified magnesia carbon brick and a preparation method thereof.
Background
The smelting of titanium carbide in an electric furnace is a complex physical and chemical process carried out under the condition of high temperature, and mainly aims at smelting TiO in blast furnace slag2The TiC is reduced to TiC, the melting point of the TiC is high and can reach 3150 ℃, and the final product of the carbide furnace also forms titanium carbide slag, and the alkalinity of the whole slag is low and is generally about 1.0.
The lining of the electric furnace is not only subjected to strong high-temperature action in the smelting process, but also subjected to physical and chemical erosion and mechanical scouring action of furnace charge, high-temperature furnace gas, molten iron and high-temperature furnace slag. Meanwhile, a large amount of reducing agents are added during smelting, and a furnace cover is covered, so that the smelting process is basically in a reducing atmosphere, the whole furnace body is exposed in the air due to the fact that blast furnace slag needs to be received and maintained after smelting, heat loss is obvious, the electric furnace is in an oxidizing atmosphere at the time, the two atmospheres are alternately carried out, and the temperature of the furnace body is quenched and suddenly heated. In view of the special smelting environment and process of the high-temperature carbonization furnace, in order to ensure that the water-cooling slag-adhering of the electric furnace prolongs the furnace life, ensure high-efficiency economic operation and realize the industrialization goal of reaching the effect as soon as possible, the refractory bricks used by the carbonization furnace are required to have the following properties: 1) the high-temperature resistant performance is good, and the high-temperature environment of 1650 ℃ or so can be borne; 2) good slag resistance and thermal shock stability; 3) high-temperature strength, high-temperature-resistant melting loss and good abrasion resistance; 4) good heat conductivity and oxidation resistance.
Therefore, the refractory brick for the carbonization furnace is made of refractory raw materials with high melting point and high strength, and the matrix part of the refractory brick can form a high-melting-point phase at high temperature so as to improve the high-temperature refractory performance and slag adhering performance of products, and play roles in protecting the furnace lining and delaying the melting loss of the furnace lining. How to obtain the components of the refractory bricks for the carbonization furnace with better performance is a hot spot of research of the technicians in the field.
Disclosure of Invention
In view of the above, the present invention aims to provide a modified magnesia carbon brick and a preparation method thereof, and the modified magnesia carbon brick provided by the invention has good performance and is suitable for being used as a refractory brick for a carbonization furnace.
The invention provides a preparation method of a modified magnesia carbon brick, which comprises the following steps:
mixing magnesia, an aluminum-magnesium-calcium composite material, graphite, composite metal powder and a composite binder to obtain a mixture;
the aluminum-magnesium-calcium complex phase material comprises:
0.3 to 0.35 wt% of SiO2；
81-82 wt% Al2O3；
6.5-7.5 wt% CaO;
10.5 to 11.5 wt% of MgO;
the composite metal powder comprises metal aluminum powder and metal zinc powder;
forming the mixture to obtain a green body;
and drying the blank to obtain the modified magnesia carbon brick.
In the present invention, the magnesite is preferably fused magnesite; the fused magnesite preferably comprises:
0.65 to 1.5 wt% of SiO2；
0.3-1.5 wt% CaO;
97 to 99 wt% of MgO.
In the present invention, SiO2The mass content of (b) is preferably 0.68 wt%; the mass content of CaO is preferably 0.4%; the MgO content is preferably 97.46% by mass.
In the invention, the volume density of the fused magnesia is preferably 3-4 g/cm3More preferably 3.48g/cm3。
In the invention, the granularity of the magnesite preferably comprises 6-3 mm, 3-1 mm, 1-0 mm and less than 200 meshes; in the invention, the granularity of 6-3 mm means that the particle size is less than 6mm and more than 3 mm; the granularity of 3-1 mm means that the particle size is less than 3mm and more than or equal to 1 mm; the 1-0 mm means 1mm or less, and the 1mm is calculated as a fraction of 3-1 mm, and the end point assignment is not clear.
In the invention, the magnesite with the particle sizes of 6-3 mm, 3-1 mm and 1-0 mm is preferably prepared by a crusher, and the magnesite with the particle size of less than 200 meshes is preferably prepared by fine grinding equipment.
In the invention, the mass ratio of 6-3 mm granularity, 3-1 mm granularity, 1-0 mm granularity and magnesia with granularity less than 200 meshes is preferably (20-28): (20-25): (20-25): (3-7), more preferably (22-26): (21-24): (21-24): (4-6), most preferably (23-25): (22-23): (22-23): 5.
in the invention, the aluminum-magnesium-calcium complex phase material can be prepared by mixing vanadium-titanium slag and industrial alumina, pelletizing and then carrying out electric smelting; the material contains MA (magnesium aluminate spinel) and CA2(calcium dialuminate) and CA6Three phases (calcium hexaluminate).
In the invention, the aluminum-magnesium-calcium complex phase material comprises:
0.3 to 0.35 wt% of SiO2；
81-82 wt% Al2O3；
6.5-7.5 wt% CaO;
10.5 to 11.5 wt% of MgO.
In the present invention, the SiO2The mass content of (b) is preferably 0.33%; the Al is2O3The mass content of (b) is preferably 81.45%; the mass content of CaO is preferably 7.19%; the MgO content is preferably 10.71% by mass.
In the invention, the preferred volume density of the aluminum-calcium-magnesium composite phase material is 2.5-3.5 g/cm3More preferably 3.10g/cm3。
In the invention, the aluminum magnesium calcium complex phase material can be purchased from the market.
In the invention, the granularity of the aluminum-magnesium-calcium composite material is preferably 1-0 mm, namely the granularity is less than 1 mm.
In the present invention, the mass content of C in the graphite is preferably not less than 98%.
In the present invention, the graphite is preferably large flake graphite; the granularity of the graphite is preferably +100 meshes, wherein the +100 meshes means that the particle size is equal to or larger than 75% on a 100-mesh sieve.
In the invention, the composite metal powder comprises metal aluminum powder and metal zinc powder; the particle size of the composite metal powder is preferably 200-400 meshes, more preferably 250-350 meshes, and most preferably 300 meshes.
In the invention, the mass ratio of the metal aluminum powder to the metal zinc powder is preferably (1-5): 1, more preferably (2-3): 1.
in the present invention, the composite binder includes a carbon-containing resin and a liquid phenolic resin.
In the invention, the softening point of the carbon-containing resin is preferably 220-250 ℃, and most preferably 235 ℃; the particle size of the carbon-containing resin is preferably d50 ═ 60 um; the carbon-containing resin preferably contains 80 to 85% by mass of C, and more preferably contains 83% by mass of C.
In the present invention, the mass content of C in the liquid phenolic resin is preferably not less than 42%.
In the present invention, the mass ratio of the carbon-containing resin to the liquid phenol resin is preferably 1: (4-6), more preferably 1: 5.
In the invention, the mass ratio of the magnesia to the aluminum-magnesium-calcium composite material to the graphite to the composite metal powder is preferably (63-85): (2-5): (17-24): (2-4), more preferably (70-80): (3-4): (19-22): (2.5-3.5), most preferably (73-77): 3.5: (20-21): 3.
in the invention, the mass of the composite binder is preferably 3-5%, more preferably 3.5-4.5%, and most preferably 4% of the total mass of the magnesite, the aluminum-magnesium-calcium composite material, the graphite and the composite metal powder.
In the present invention, the method of mixing is preferably mix-milling, more preferably mix-milling in a high-speed mixer; the method of mixing most preferably comprises:
and (2) carrying out low-speed mixed grinding on the magnesia (except the magnesia with the particle size less than 200 meshes), the aluminum-magnesium-calcium composite material and the composite metal powder for 1-2 minutes, adding half of the composite bonding agent by mass, carrying out low-speed mixed grinding for 1-2 minutes, then adding the graphite for low-speed mixed grinding for 2-3 minutes, continuously adding the rest half of the composite bonding agent by mass, carrying out low-speed mixed grinding for 1-2 minutes, finally adding the magnesia with the particle size less than 200 meshes, carrying out high-speed mixed grinding for not less than 10 minutes, and discharging.
In the invention, the low-speed mixing and milling speed is preferably 500-600 r/min; the high-speed mixing and grinding speed is preferably 1000-1200 r/min; the high-speed mixing and milling time is preferably 10-12 min.
In the invention, the discharging temperature is preferably controlled to be 45-60 ℃, and more preferably 50-55 ℃.
In the invention, the molding is preferably automatically molded by a friction brick press; the tonnage of the friction brick press is preferably 1000t or more.
In the invention, after the forming, the formed product is preferably naturally dried to obtain a blank; the natural drying time is preferably 20 to 30 hours, more preferably 22 to 28 hours, and most preferably 24 to 26 hours.
In the present invention, it is preferable that the naturally dried product (green body) is dried in a tunnel drying kiln; the drying temperature is preferably 180-200 ℃, more preferably 185-195 ℃, and most preferably 190 ℃; the drying time is preferably 12 to 18 hours, and more preferably 14 to 16 hours.
The invention also provides a modified magnesia carbon brick prepared by the method in the technical scheme; the preparation method of the modified magnesia carbon brick is consistent with the technical scheme, and is not repeated herein.
The modified magnesia-carbon brick for the high-temperature carbonization furnace is prepared by taking high-purity fused magnesia, high-purity crystalline flake graphite and AMC multiphase materials (aluminum-magnesium-calcium multiphase materials) as main raw materials, adding composite metal powder and compounding organic binder, has the advantages of high temperature resistance, high strength, high heat conductivity, good slag resistance, oxidation resistance, thermal shock stability and the like, and is suitable for the furnace lining of the water-cooled carbonization furnace for titanium extraction from blast furnace slag.
Compared with the common 14C magnesia carbon brick for the existing high-temperature carbonization furnace, the modified magnesia carbon brick provided by the invention adopts the electric melting magnesia, graphite and a metal antioxidant, and is also added with an AMC multiphase material, and simultaneously, metal zinc and carbon-containing resin serving as a soft binder are introduced; the raw materials improve the stress absorption structure of the magnesia carbon brick, improve the strength and the thermal state breaking strength after carbonization, enhance the thermal shock stability and the slag erosion resistance, can delay the corrosion loss of the brick and improve the furnace life, and obtain good use effect in a high-temperature carbonization furnace for climbing steel demonstration lines.
The modified magnesia carbon brick provided by the invention has the total carbon content of more than 18 percent, and the thermal conductivity of 18.5W/m.K, and is suitable for smelting various water-cooled electric furnaces and converters; the high-temperature carbonization furnace has good high-temperature performance and long service life, and has good use effect in climbing steel demonstration lines. The successful development and application of the modified magnesia carbon brick for the high-temperature carbonization furnace not only provides strong technical support for the high-temperature carbonization furnace to achieve the goal of achieving yield and efficiency and overcoming the problem, but also provides technical reserve for the technical progress of titanium extraction and smelting of blast furnace slag and the selection of a new generation of electric furnace refractory materials; meanwhile, the research and development level of the refractory material technology is greatly improved, the influence and market share of refractory material products are further expanded, and the method has good social and economic benefits and good market popularization and application prospects.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other examples, which may be modified or appreciated by those of ordinary skill in the art based on the examples given herein, are intended to be within the scope of the present invention.
The raw materials used in the following examples of the present invention are all commercially available products, and the compositions are shown in the following table:
example 1
6-3 mm22 wt% of fused magnesite, 3-1 mm 25 wt%, 1-0 mm 20 wt%, 3 wt% of fine powder smaller than 200 meshes, 5 wt% of 1-0 mm AMC complex phase material, 3 wt% of composite metal powder, 22 wt% of large flake graphite, and 3.5 wt% of composite bonding agent (the mass of the composite bonding agent is 3.5% of the total mass of the fused magnesite, the AMC complex phase material, the composite metal powder and the large flake graphite), and mixing and grinding through a high-speed mixing and grinding machine: firstly adding fused magnesia (except fused magnesia with the particle size less than 200 meshes), AMC complex phase material and composite metal powder into a high-speed mixing mill for low-speed mixing and milling for 550 revolutions per minute for 1-2 minutes, then adding half of the mass of composite bonding agent for low-speed mixing and milling for 550 revolutions per minute for 1-2 minutes, then adding graphite for low-speed mixing and milling for 550 revolutions per minute for 2-3 minutes, continuously adding the remaining half of the mass of composite bonding agent for low-speed mixing and milling for 550 revolutions per minute for 1-2 minutes, finally adding fused magnesia with the particle size less than 200 meshes for high-speed mixing and milling for 1100 revolutions per minute for 12 minutes, and controlling the discharging temperature at 45-60 ℃ after mixing and milling; automatically molding the mixed pug in a 1000 t-tonnage friction brick molding machine, naturally drying the molded product for 24 hours, and then drying the molded product in a tunnel drying kiln according to a drying system of 180 ℃ and 16 hours to obtain the modified magnesia carbon brick;
the composite metal powder is: the mixture of 200-mesh metal aluminum powder and 400-mesh metal zinc powder is prepared, and the mass ratio is 5: 1; the composite binder is: the mass ratio of the carbon-containing resin to the liquid phenolic resin is 1: 6.
The modified magnesia carbon brick prepared in the embodiment 1 of the invention is subjected to performance detection, and the detection result is as follows:
| item | Index requirement | Measured index | Detection method |
| MgO，％ | ≥68 | 68.82 | GB/T5069-2015 |
| CAll-purpose，％ | ≥18 | 23.36 | GB/T16555-2008 |
| Porosity% | ≤3 | 1.8 | GB/T2997-2015 |
| Bulk density, g/cm3 | ≥2.96 | 2.97 | GB/T2997-2015 |
| Compressive strength at room temperature, MPa | ≥35 | 36.2 | GB/T5072-2008 |
| High temperature flexural strength, MPa | ≥10 | 12.7 | GB/T3002-2004 |
Example 2
25 wt% of fused magnesite 6-3 mm, 24 wt% of fused magnesite 3-1 mm, 21 wt% of fused magnesite 1-0 mm, 7 wt% of fine powder smaller than 200 meshes, 2 wt% of AMC heterogeneous material 1-0 mm, 3 wt% of composite metal powder, 18 wt% of large flake graphite, and 3 wt% of composite bonding agent (the mass of the composite bonding agent is 3% of the total mass of the fused magnesite, the AMC heterogeneous material, the composite metal powder and the large flake graphite), and mixing and grinding through a high-speed mixing and grinding machine: firstly adding fused magnesia (except fused magnesia with a particle size of less than 200 meshes), AMC (amorphous polycarbonate) complex phase material and composite metal powder, performing low-speed mixed grinding for 500 revolutions per minute for 1-2 minutes in a high-speed mixed grinding machine, then adding half of the mass of composite binder, performing low-speed mixed grinding for 500 revolutions per minute for 1-2 minutes, then adding graphite, performing low-speed mixed grinding for 500 revolutions per minute for 2-3 minutes, continuously adding the remaining half of the mass of composite binder, performing low-speed mixed grinding for 500 revolutions per minute for 1-2 minutes, finally adding fused magnesia with a particle size of less than 200 meshes, performing high-speed mixed grinding for 1000 revolutions per minute for 12 minutes, controlling the discharging temperature at 45-60 ℃ after the mixed grinding, automatically forming the mixed mud in a 1000 t-tonnage friction brick press, naturally drying the formed product for 24 hours, and then drying the formed product in a tunnel drying kiln according to a drying system of 190 ℃;
the composite metal powder is: the mixture of 200-mesh metal aluminum powder and 400-mesh metal zinc powder is prepared, and the mass ratio is 2: 1; the composite binder is: the mass ratio of the carbon-containing resin to the liquid phenolic resin is 1: 5.
The modified magnesia carbon brick prepared in the embodiment 2 of the invention is detected, and the detection result is as follows:
| item | Index requirement | Measured index | Detection method |
| MgO，％ | ≥68 | 73.92 | GB/T5069-2015 |
| CAll-purpose，％ | ≥18 | 19.44 | GB/T16555-2008 |
| Porosity% | ≤3.0 | 2.0 | GB/T2997-2015 |
| Bulk density, g/cm3 | ≥2.96 | 2.98 | GB/T2997-2015 |
| Compressive strength at room temperature, MPa | ≥35 | 39.5 | GB/T5072-2008 |
| High temperature flexural strength, MPa | ≥10 | 13.2 | GB/T3002-2004 |
Example 3
6-3 mm 28 wt% of fused magnesite, 3-1 mm24wt wt%, 1-0 mm 20 wt%, 5 wt% of fine powder smaller than 200 meshes, 4 wt% of 1-0 mm AMC heterogeneous material, 2 wt% of composite metal powder and 17 wt% of large flake graphite, and 3 wt% of water-based binder (the mass of the composite binder is 3% of the total mass of the fused magnesite, the AMC heterogeneous material, the composite metal powder and the large flake graphite) is added, and the mixture is milled by a high-speed milling machine: firstly adding fused magnesia (except fused magnesia with a particle size of less than 200 meshes), AMC (amorphous polycarbonate) complex phase material and composite metal powder, performing low-speed mixed grinding for 600 revolutions/minutes to 1-2 minutes in a high-speed mixed grinding machine, then adding half of the mass of composite binder, performing low-speed mixed grinding for 600 revolutions/minutes to 1-2 minutes, then adding graphite, performing low-speed mixed grinding for 2-3 minutes, continuously adding the remaining half of the mass of composite binder, performing low-speed mixed grinding for 600 revolutions/minutes to 1-2 minutes, finally adding fused magnesia with a particle size of less than 200 meshes, performing high-speed mixed grinding for 1200 revolutions/minutes to 12 minutes, controlling the discharging temperature at 45-60 ℃ after the mixed grinding, automatically forming the mixed mud in a 1000 t-tonnage friction brick press, naturally drying the formed product for 24 hours, and then drying the formed product in a tunnel drying kiln according to a drying system of 200 ℃ and 16 hours to obtain;
the composite metal powder is: the mixture of 200-mesh metal aluminum powder and 400-mesh metal zinc powder is 1:1 in mass ratio; the composite binder is: the mass ratio of the carbon-containing resin to the liquid phenolic resin is 1: 5.
The modified magnesia carbon brick prepared in the embodiment 3 of the invention is detected, and the detection result is as follows:
| item | Index requirement | Measured index | Detection method |
| MgO，％ | ≥68 | 75.09 | GB/T5069-2015 |
| CAll-purpose，％ | ≥18 | 18.46 | GB/T16555-2008 |
| Porosity% | ≤3.0 | 2.4 | GB/T2997-2015 |
| Bulk density, g/cm3 | ≥2.96 | 3.00 | GB/T2997-2015 |
| Compressive strength at room temperature, MPa | ≥35 | 41.6 | GB/T5072-2008 |
| High temperature flexural strength, MPa | ≥10 | 11.8 | GB/T3002-2004 |
Example 4
24 wt% of fused magnesite 6-3 mm, 22wt wt% of fused magnesite 3-1 mm, 25 wt% of fused magnesite 1-0 mm, 3 wt% of fine powder smaller than 200 meshes, 3 wt% of AMC heterogeneous material 1-0 mm, 3 wt% of composite metal powder and 20 wt% of large flake graphite, and 5 wt% of composite binder (the mass of the composite binder is 5% of the total mass of the fused magnesite, the AMC heterogeneous material, the composite metal powder and the large flake graphite) is added, and the mixture is milled through a high-speed milling machine: firstly adding fused magnesia (except fused magnesia with a particle size of less than 200 meshes), AMC (advanced micro-electromechanical systems) complex phase material and composite metal powder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes in a high-speed mixed grinding machine, then adding half of the mass of composite binder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes, then adding graphite, performing low-speed mixed grinding for 550 revolutions/minutes for 2-3 minutes, continuously adding the remaining half of the mass of composite binder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes, finally adding fused magnesia with a particle size of less than 200 meshes, performing high-speed mixed grinding for 1100 revolutions/minutes for 12 minutes, controlling the discharging temperature at 45-60 ℃ after the mixed grinding, automatically forming the mixed mud in a 1000 t-tonnage friction brick press, naturally drying the formed product for 24 hours, and then drying the formed product in a tunnel drying kiln according to a drying system;
the composite metal powder is: the mixture of 200-mesh metal aluminum powder and 400-mesh metal zinc powder is prepared, and the mass ratio is 3: 1; the composite binder is: the mass ratio of the carbon-containing resin to the liquid phenolic resin is 1: 3.
The performance of the modified magnesia carbon brick prepared in the embodiment 4 of the invention is detected, and the detection result is as follows:
| item | Index requirement | Measured index | Detection method |
| MgO，％ | ≥68 | 72.08 | GB/T5069-2015 |
| CAll-purpose，％ | ≥18 | 21.40 | GB/T16555-2008 |
| Porosity% | ≤3.0 | 1.7 | GB/T2997-2015 |
| Bulk density, g/cm3 | ≥2.96 | 2.97 | GB/T2997-2015 |
| Compressive strength at room temperature, MPa | ≥35 | 36.6 | GB/T5072-2008 |
| High temperature flexural strength, MPa | ≥10 | 12.8 | GB/T3002-2004 |
Example 5
25 wt% of fused magnesite 6-3 mm, 22wt wt% of fused magnesite 3-1 mm, 20 wt% of fused magnesite 1-0 mm, 3 wt% of fine powder smaller than 200 meshes, 2 wt% of AMC heterogeneous material 1-0 mm, 4 wt% of composite metal powder and 24 wt% of large flake graphite, and 5 wt% of composite binder (the mass of the composite binder is 5% of the total mass of the fused magnesite, the AMC heterogeneous material, the composite metal powder and the large flake graphite) are added, and the mixture is milled through a high-speed milling machine: firstly adding fused magnesia (except fused magnesia with a particle size of less than 200 meshes), AMC (advanced micro-electromechanical systems) complex phase material and composite metal powder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes in a high-speed mixed grinding machine, then adding half of the mass of composite binder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes, then adding graphite, performing low-speed mixed grinding for 550 revolutions/minutes for 2-3 minutes, continuously adding the remaining half of the mass of composite binder, performing low-speed mixed grinding for 550 revolutions/minutes for 1-2 minutes, finally adding fused magnesia with a particle size of less than 200 meshes, performing high-speed mixed grinding for 1100 revolutions/minutes for 12 minutes, controlling the discharging temperature at 45-60 ℃ after the mixed grinding, automatically forming the mixed mud in a 1000 t-tonnage friction brick press, naturally drying the formed product for 24 hours, and then drying the formed product in a tunnel drying kiln according to a drying system;
the composite metal powder is: the mixture of 200-mesh metal aluminum powder and 400-mesh metal zinc powder is prepared, and the mass ratio is 3: 1; the composite binder is: the mass ratio of the carbon-containing resin to the liquid phenolic resin is 1: 4.
The modified magnesia carbon brick prepared in the embodiment 5 of the invention is subjected to performance detection, and the detection result is as follows:
from the above embodiments, the present invention provides a method for preparing a modified magnesia carbon brick, comprising: mixing magnesia, an aluminum-magnesium-calcium composite material, graphite, composite metal powder and a composite binder to obtain a mixture; forming the mixture to obtain a green body; and drying the blank to obtain the modified magnesia carbon brick. The modified magnesia-carbon brick for the high-temperature carbonization furnace is prepared by taking high-purity fused magnesia, high-purity crystalline flake graphite and an aluminum-magnesium-calcium composite phase material as main raw materials, adding composite metal powder and compounding an organic binder, has the advantages of high temperature resistance, high strength and high heat conductivity, good slag resistance, oxidation resistance, thermal shock stability and the like, and is suitable for being used for extracting titanium from blast furnace slag to smelt the lining of the water-cooled carbonization furnace.
While only the preferred embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A preparation method of a modified magnesia carbon brick comprises the following steps:
mixing magnesia, an aluminum-magnesium-calcium composite material, graphite, composite metal powder and a composite binder to obtain a mixture;
the aluminum-magnesium-calcium complex phase material comprises:
0.3 to 0.35 wt% of SiO2；
81-82 wt% Al2O3；
6.5-7.5 wt% CaO;
10.5 to 11.5 wt% of MgO;
the composite metal powder comprises metal aluminum powder and metal zinc powder;
forming the mixture to obtain a green body;
and drying the blank to obtain the modified magnesia carbon brick.
2. The method of claim 1, wherein the magnesite is fused magnesite.
3. The method of claim 1, wherein the magnesite grain size includes 6 to 3mm, 3 to 1mm, 1 to 0mm, and less than 200 mesh.
4. The method according to claim 3, wherein the mass ratio of 6-3 mm particle size, 3-1 mm particle size, 1-0 mm particle size and less than 200 mesh size magnesite is (20-28): (20-25): (20-25): (3-7).
5. The method according to claim 1, wherein the particle size of the aluminum-magnesium-calcium composite material is 1-0 mm.
6. The method according to claim 1, wherein the particle size of the composite metal powder is 200 to 400 mesh.
7. The method of claim 1, wherein the composite binder comprises a carbon-containing resin and a liquid phenolic resin; the softening point of the carbon-containing resin is 220-250 ℃.
8. The method according to claim 1, wherein the mass ratio of the magnesite, the aluminum-magnesium-calcium composite material, the graphite and the composite metal powder is (63-85): (2-5): (17-24): (2-4);
the composite binder is 3-5% of the total mass of the magnesia, the aluminum-magnesium-calcium composite material, the graphite and the composite metal powder.
9. The method according to claim 1, wherein the drying temperature is 180-200 ℃; the time is 12-18 hours.
10. A modified magnesia carbon brick produced by the method of claim 1.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517761A (en) * | 2020-04-16 | 2020-08-11 | 北京利尔高温材料股份有限公司 | Composite lining material and application method thereof |
| CN111732419A (en) * | 2020-08-28 | 2020-10-02 | 北京利尔高温材料股份有限公司 | Ultra-low carbon magnesia carbon brick with excellent performance and preparation method thereof |
| CN116082024A (en) * | 2022-11-03 | 2023-05-09 | 攀钢冶金材料有限责任公司 | Baking-free blast furnace tapping channel ramming material, preparation method and application thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774818A (en) * | 2010-01-29 | 2010-07-14 | 郑州大学 | Aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick for ladle lining |
| CN102633511A (en) * | 2012-04-09 | 2012-08-15 | 宜兴市诺明高温耐火材料有限公司 | Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof |
| CN103570368A (en) * | 2013-11-06 | 2014-02-12 | 营口鲅鱼圈耐火材料有限公司 | Magnesia carbon brick for electric furnace and preparation method thereof |
| CN108101515A (en) * | 2017-11-20 | 2018-06-01 | 武汉钢铁集团耐火材料有限责任公司 | RH vacuum drying oven inner lining fireproof materials |
| CN108383504A (en) * | 2018-03-12 | 2018-08-10 | 海城利尔麦格西塔材料有限公司 | A kind of coverter pig magnesia carbon brick and preparation method thereof |
| CN108863414A (en) * | 2018-08-14 | 2018-11-23 | 上海新泰山高温工程材料有限公司 | A kind of high performance magnesia carbon brick and preparation method thereof |
-
2019
- 2019-11-12 CN CN201911098667.9A patent/CN110606733A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101774818A (en) * | 2010-01-29 | 2010-07-14 | 郑州大学 | Aluminum/zinc composite ultralow-carbon alumina-magnesite carbon brick for ladle lining |
| CN102633511A (en) * | 2012-04-09 | 2012-08-15 | 宜兴市诺明高温耐火材料有限公司 | Aluminum-spinel-magnesia composite refractory as well as preparation method and application thereof |
| CN103570368A (en) * | 2013-11-06 | 2014-02-12 | 营口鲅鱼圈耐火材料有限公司 | Magnesia carbon brick for electric furnace and preparation method thereof |
| CN108101515A (en) * | 2017-11-20 | 2018-06-01 | 武汉钢铁集团耐火材料有限责任公司 | RH vacuum drying oven inner lining fireproof materials |
| CN108383504A (en) * | 2018-03-12 | 2018-08-10 | 海城利尔麦格西塔材料有限公司 | A kind of coverter pig magnesia carbon brick and preparation method thereof |
| CN108863414A (en) * | 2018-08-14 | 2018-11-23 | 上海新泰山高温工程材料有限公司 | A kind of high performance magnesia carbon brick and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 翟玉春编著: "《冶金热力学》", 31 August 2018, 北京：冶金工业出版社 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111517761A (en) * | 2020-04-16 | 2020-08-11 | 北京利尔高温材料股份有限公司 | Composite lining material and application method thereof |
| CN111732419A (en) * | 2020-08-28 | 2020-10-02 | 北京利尔高温材料股份有限公司 | Ultra-low carbon magnesia carbon brick with excellent performance and preparation method thereof |
| CN116082024A (en) * | 2022-11-03 | 2023-05-09 | 攀钢冶金材料有限责任公司 | Baking-free blast furnace tapping channel ramming material, preparation method and application thereof |
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