CN112250421A - Magnesia carbon brick for impact area of converter and preparation method thereof - Google Patents
Magnesia carbon brick for impact area of converter and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a magnesia carbon brick for a converter impact area and a preparation method thereof, wherein the magnesia carbon brick comprises the following raw materials in parts by weight: 10-30 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5 mm; 20-40 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm; 10-30 parts of fused magnesia with the granularity of more than or equal to 0.5mm and less than 1 mm; 10-20 parts of fused magnesia fine powder with the granularity of less than 0.0088 mm; 3-6 parts of flaky graphite; 1-3 parts of phenolic resin binder; 1-6 parts of an additive; the additive is composed of resin powder with the grain size less than or equal to 320 meshes, Ni powder and alpha-Al2O3And steel fiber. The magnesia carbon brick in the impact area of the converter prepared by the additive has higher matching degree with furnace linings of other parts, effectively ensures the continuous and stable production of a steel mill, and has important significance for increasing the economic benefit of the steel mill.
Description
Technical Field
The invention belongs to the field of refractory materials, and particularly relates to a magnesia carbon brick for a converter impact area and a preparation method thereof.
Background
The converter has developed into the current mainstream steel-making kiln appliance due to the advantages of short smelting turnover, high production efficiency, good product quality and the like. With the emergence of new technologies such as top-bottom combined blowing, continuous casting and rolling, secondary refining, slag splashing and furnace protection and the like, the position of the converter in steel making is further consolidated. However, converter steelmaking is a long-flow steelmaking method, and the main raw material of the converter steelmaking is liquid molten iron smelted by a blast furnace. In recent years, with the enhancement of the environment protection work of the country, the blast furnace which is out of date in technology and seriously polluted is shut down and dismantled; during the heating period in winter in the north, measures for greatly limiting the output of the blast furnace are adopted to relieve the air pollution problem in winter, and the like. The direct influence of the measures on the steelmaking of the converter is to reduce the supply of molten iron entering the converter. However, in recent two years, the steel market is getting better, the steel price is continuously rising, the profit per ton of steel is continuously rising, and most steel mills adopt a method of increasing the adding amount of converter scrap in order to maintain or improve the steel yield.
The working layer of the converter lining is mainly built by magnesia carbon bricks, wherein the impact area is severely impacted and washed when adding scrap steel and adding molten iron, and the impact area is the main reason for damaging the magnesia carbon bricks on the charging side. In order to adapt to the current large trend that the proportion of scrap steel in the steelmaking raw materials of the converter is gradually increased and to prolong the service life of the whole lining of the converter, the magnesia carbon brick for the impact area of the converter and the preparation method thereof are urgently needed to meet the development requirement at present.
Disclosure of Invention
In order to solve the above problems, the present application provides a magnesia carbon brick for a converter impact zone, which adopts a novel additive to make the magnesia carbon brick for the converter impact zone have strong thermal shock stability and erosion resistance and improve toughness, plasticity and bending resistance of the magnesia carbon brick.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a magnesia carbon brick for a converter impact area is composed of the following raw materials in parts by weight:
10-30 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5 mm;
20-40 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
10-30 parts of fused magnesia with the granularity of more than or equal to 0.5mm and less than 1 mm;
10-20 parts of fused magnesia fine powder with the granularity of less than 0.0088 mm;
3-6 parts of flaky graphite;
1-3 parts of phenolic resin binder;
1-6 parts of an additive;
the additive is composed of resin powder with the grain size less than or equal to 320 meshes, Ni powder and alpha-Al2O3And steel fiber.
Specifically, in some embodiments, the physical and chemical indexes of fused magnesite according to the present invention are: MgO is more than or equal to 97.2 wt%, CaO is less than or equal to 2.0 wt%, and SiO2≤1.5wt％，Fe2O3Not more than 1.0 wt%, volume density not less than 3.4g/cm3。
Specifically, in some embodiments, the flake graphite of the present invention has a particle size of less than 0.088mm, wherein the carbon content is, by mass: c is more than or equal to 96.0 percent.
Specifically, in some embodiments, the phenolic resin binder of the present invention has the following physical and chemical indexes: the solid content is more than or equal to 80 wt%, the residual carbon is more than or equal to 46 wt%, the free phenol is less than or equal to 10 wt%, the water content is less than or equal to 3.0 wt%, and the pH value is 6-7.
Specifically, in some embodiments, the additive is carbon-containing resin powder with a softening point of 200-235 ℃, a residual carbon content of 80-85 wt% and a particle size of less than 0.088 mm; the steel fiber is crescent heat-resistant stainless steel fiber, the thickness of the steel fiber is 0.5 +/-0.1 mm, the width of the steel fiber is 0.5 +/-0.1 mm, and the length of the steel fiber is 5-10 mm; the particle size of the Ni powder is 100-500 nm.
Preferably, the additive comprises resin, Ni powder and alpha-Al2O3The weight ratio of the steel fibers is 2:1:1: 0.5.
The invention also aims to provide a preparation method of the magnesia carbon brick for the impact area of the converter, which comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the magnesia carbon brick for the impact area of the converter prepared by the invention are as follows: MgO is more than or equal to 80 percent, C is less than or equal to 6 percent, and the bulk density after being baked at 200 ℃ is more than or equal to 3.10g/cm3The apparent porosity is less than or equal to 3 percent, the compressive strength is more than or equal to 50MPa, and the linear change rate is 0-1.0 percent.
Compared with the prior art, the invention has the following beneficial effects:
the impact area magnesia carbon brick prepared by the invention is reduced from the traditional carbon content of 10-16% to the carbon content of 4-6%, and simultaneously, a novel additive is introduced to ensure that the thermal shock stability and the erosion resistance of the impact area magnesia carbon brick of the converter meet the use requirements. The additive is mainly composed of resin powder, Ni powder and alpha-Al2O3The resin powder can be softened at the steelmaking smelting temperature to promote green brick sintering, and a carbon net is formed in the green brick after the resin powder is solidified to enhance the strength of the product; ni powder is uniformly distributed in the carbonized carbon binder in the product, and a uniform coating layer can be formed on the surface of the graphite, so that the oxidation resistance of the product is improved; alpha-Al2O3Has granulesThe coating has the characteristics of small degree, high dispersion degree, high activity and the like, is beneficial to in-situ reaction at high temperature, blocks air holes along with light and micro volume expansion in the reaction process, and forms a compact MA protective layer on the surface of the brick, thereby inhibiting the oxidation of the brick and increasing the scouring resistance of the brick. The steel fiber improves the thermal conductivity of the low-carbon magnesia carbon brick in the impact area, and the liquid phase is generated at high temperature, so that the internal stress is reduced, and the thermal shock resistance of the low-carbon magnesia carbon brick is improved.
The magnesia carbon brick in the impact area of the converter prepared by the additive has higher matching degree with furnace linings of other parts, effectively ensures the continuous and stable production of a steel mill, and has important significance for increasing the economic benefit of the steel mill
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. The physical and chemical indexes of the fused magnesia adopted in the following examples are as follows: 98 wt% of MgO, less than or equal to 2.0 wt% of CaO, and SiO2≤1.5wt％，Fe2O3Less than or equal to 1.0 weight percent and the volume density of 3.8g/cm3. The indexes of the phenolic resin are that the solid content is 85 wt%, the carbon residue is 50 wt%, the free phenol is 7.5 wt%, the water content is 2.0 wt%, and the pH value is 6.5.
Example 1
A magnesia carbon brick for a converter impact area is composed of the following raw materials in parts by weight:
15 parts of fused magnesia with the granularity of not less than 3mm and less than 5 mm;
20 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
30 parts of fused magnesia with the granularity of more than or equal to 0mm and less than 1 mm;
16 parts of fused magnesia fine powder with the granularity of less than 0.088 mm;
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
3 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3Four kinds of steel fibers with the grain diameter of 0.5mmThe raw materials are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The detection data of the magnesia carbon brick for the impact area of the converter prepared in the embodiment are as follows:
MgO: 82%, C: 4%, bulk density after baking at 200 ℃: 3.12g/cm3Apparent porosity: 3%, compressive strength: 50MPa, and the linear change rate is 0.8 percent.
Example 2
23 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5 mm;
29 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
(0) 18 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
12 parts of fused magnesia fine powder with the granularity smaller than (0.088);
4 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
2 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3And the four raw materials of the steel fiber with the grain diameter of 0.5mm are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 84%, C: 5%, volume density after baking at 200 ℃: 3.10g/cm3The apparent porosity was 2.8%, the compressive strength was 52MPa, and the linear change rate was 0.7%.
Example 3
22 parts of fused magnesia with the granularity of less than or equal to 3mm and less than 5 mm;
30 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
(0) 20 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
13 parts of fused magnesia fine powder with the granularity smaller than (0.088);
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
4 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3And the four raw materials of the steel fiber with the grain diameter of 0.5mm are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 84%, C: 6 percent, volume density after baking at 200 ℃: 3.10g/cm3The apparent porosity was 2.5%, the compressive strength was 55MPa, and the linear change rate was 0.8%.
Example 4
24 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5 mm;
29 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
(0) 19 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
12 parts of fused magnesia fine powder with the granularity smaller than (0.088);
5 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
2 parts of phenolic resin;
5 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3And the four raw materials of the steel fiber with the grain diameter of 0.5mm are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 83%, C: 6 percent, volume density after baking at 200 ℃: 3.10g/cm3The apparent porosity was 2.8%, the compressive strength was 60MPa, and the linear change rate was 0.6%.
Example 5
26 parts of fused magnesia with the granularity of less than or equal to 3mm and less than 5 mm;
28 parts of fused magnesia with the granularity of less than or equal to 1mm and less than 3 mm;
(0) 22 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
11 parts of fused magnesia fine powder with the granularity smaller than (0.088);
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
5 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3And the four raw materials of the steel fiber with the grain diameter of 0.5mm are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
Prepared magnesiumThe physical and chemical indexes of the carbon brick are as follows: MgO: 84%, C: 5%, volume density after baking at 200 ℃: 3.12g/cm3The apparent porosity was 2.7%, the compressive strength was 58MPa, and the linear change rate was 0.9%.
Example 6
22 parts of fused magnesia with the granularity of less than or equal to 3mm and less than 5 mm;
29 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
(0) 20 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
14 parts of fused magnesia fine powder with the granularity smaller than (0.088);
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
4 parts of additive, which is composed of resin powder with the grain diameter of 0.080mm, nano Ni powder with the grain diameter of 100nm and alpha-Al with the grain diameter of 0.080mm2O3And the four raw materials of the steel fiber with the grain diameter of 0.5mm are mixed according to the weight ratio of 2:1:1: 0.5.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 83%, C: 5.2%, bulk density after baking at 200 ℃: 3.13g/cm3The apparent porosity was 2.9%, the compressive strength was 58MPa, and the linear change rate was 0.7%.
Blank example
22 parts of fused magnesia with the granularity of less than or equal to 3mm and less than 5 mm;
29 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
20 parts of fused magnesia with the granularity of less than or equal to 0.05mm and less than 1 mm;
14 parts of fused magnesia fine powder with the granularity smaller than (0.088);
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
the preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 83%, C: 5.2%, bulk density after baking at 200 ℃: 2.98g/cm3The apparent porosity was 3.1%, the compressive strength was 35MPa, and the linear change rate was 0.8%.
Comparative example 1
22 parts of fused magnesia with the granularity of less than or equal to 3mm and less than 5 mm;
29 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
(0) 20 parts of fused magnesia with the granularity of more than or equal to mm and less than 1 mm;
14 parts of fused magnesia fine powder with the granularity smaller than (0.088);
3 parts of flaky graphite, wherein the granularity of the flaky graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent;
3 parts of phenolic resin;
4 parts of additive, which is composed of metal aluminum powder with the particle size of 0.080 mm.
The preparation method of the magnesia carbon brick for the impact area of the converter comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing magnesite, a binding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding co-grinding powder, mixing at low speed for 3-5min, then mixing at high speed for 10-20min, then mixing at low speed for 5-8min, and discharging, wherein the discharging temperature is ensured to be 40-50 ℃, and the mud waiting time is strictly controlled, and the time from discharging and grinding to molding is required to be controlled within 30 min to ensure the mud humidity in order to avoid dry production;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
The physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO: 83%, C: 5.0%, bulk density after baking at 200 ℃: 2.99g/cm3The apparent porosity was 2.9%, the compressive strength was 40MPa, and the linear change rate was 0.9%.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (8)
1. The magnesia carbon brick for the impact area of the converter is characterized by comprising the following raw materials in parts by weight:
10-30 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5 mm;
20-40 parts of fused magnesia with the granularity of not less than 1mm and less than 3 mm;
10-30 parts of fused magnesia with the granularity of more than or equal to 0.5mm and less than 1 mm;
10-20 parts of fused magnesia fine powder with the granularity of 0.0088 mm;
3-6 parts of flaky graphite;
1-3 parts of phenolic resin binder;
1-6 parts of an additive;
the additive is composed of resin powder with the grain size less than or equal to 320 meshes, Ni powder and alpha-Al2O3And steel fiber.
2. The magnesia carbon brick for the impact zone of the converter according to claim 1, wherein the physical and chemical indexes of the fused magnesia are as follows: MgO is more than or equal to 97.2 wt%, CaO is less than or equal to 2.0 wt%, and SiO2≤1.5wt％，Fe2O3Not more than 1.0 wt%, volume density not less than 3.4g/cm3。
3. The magnesia carbon brick for the impact area of the converter according to claim 1, wherein the particle size of the flake graphite is less than 0.088mm, and the carbon content is as follows by mass percent: c is more than or equal to 96.0 percent.
4. The magnesia carbon brick for the impact area of the converter according to claim 1, wherein the phenolic resin binder has the following physical and chemical indexes: the solid content is more than or equal to 80 wt%, the residual carbon is more than or equal to 46 wt%, the free phenol is less than or equal to 10 wt%, the water content is less than or equal to 3.0 wt%, and the pH value is 6-7.
5. The magnesia carbon brick for the impact zone of the converter as claimed in claim 1, wherein the additive is resin powder containing carbon, the softening point is 200-235 ℃, the residual carbon content is 80-85 wt%, and the particle size is less than 0.088 mm; the steel fiber is crescent heat-resistant stainless steel fiber, the thickness of the steel fiber is 0.5 +/-0.1 mm, the width of the steel fiber is 0.5 +/-0.1 mm, and the length of the steel fiber is 5-10 mm; the particle size of the Ni powder is 100-500 nm.
6. The magnesia carbon brick for impact zone of converter according to claim 5, wherein said additive comprises resin, Ni powder, alpha-Al2O3The weight ratio of the steel fibers is 2:1:1: 0.5.
7. The method for preparing magnesia carbon bricks for impact zones of converters according to any of claims 1 to 6, characterized by comprising the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-milled powder for later use; weighing magnesite, a bonding agent and graphite with various granularities according to a ratio for later use;
2) mixing: mixing preheated fused magnesia with the granularity of less than or equal to 3mm and less than or equal to 5mm and the granularity of less than or equal to 1mm with phenolic resin bonding agent at the temperature of 30-50 ℃, stirring for 3-5min to ensure that the bonding agent is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder and flake graphite, mixing and stirring for 1-2min, finally adding the co-ground powder obtained in the step 1), mixing for 3-5min at the rotating speed of 40r/min, then mixing for 10-20min at the rotating speed of 60r/min, discharging after mixing for 5-8min at a low speed, ensuring the discharging temperature to be 40-50 ℃, strictly controlling the waiting time of the pug, and requiring the time from the discharging and grinding of the pug to the beginning of molding to be controlled within 30 min to ensure the humidity of the pug;
3) molding: emphasizes four-corner material raking, four-corner material pressing and high-pressure forming, and the material is light firstly and then heavy.
4) And (3) heat treatment: carrying out heat treatment by using a tunnel kiln, heating for 4h from normal temperature to 200 ℃, preserving heat for 6h at 200 ℃, taking out of the kiln and sorting to finish the preparation of the magnesia carbon brick for the impact area of the converter.
8. The method for preparing the magnesia carbon brick for the impact area of the converter according to claim 7, wherein the physical and chemical indexes of the prepared magnesia carbon brick are as follows: MgO is more than or equal to 80 percent, C is less than or equal to 6 percent, and the bulk density after being baked at 200 ℃ is more than or equal to 3.10g/cm3The apparent porosity is less than or equal to 3 percent, the compressive strength is more than or equal to 50MPa, and the linear change rate is 0-1.0 percent.
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