CN111960835A - Pointing material for reducing oxidation of electric furnace magnesia carbon brick and preparation and use methods thereof - Google Patents
Pointing material for reducing oxidation of electric furnace magnesia carbon brick and preparation and use methods thereof Download PDFInfo
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- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a jointing material for reducing oxidation of an electric furnace magnesia carbon brick, and a preparation method and a use method thereof. Aiming at the problems that the magnesia carbon brick of the electric furnace is easy to oxidize and has short service life, the invention provides a jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, which comprises the following components: 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium extraction sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent. The invention also provides a preparation method and a use method of the joint pointing material, the joint pointing material is filled in the gap between the water-cooled walls of the electric furnace, the oxidation of the magnesia carbon brick of the electric furnace can be reduced, the C content of the magnesia carbon brick at the tail part of the electric furnace can be kept at 9.3-10.5%, the service life of the magnesia carbon brick is prolonged, and the smelting cost of the electric furnace is reduced. The invention provides a brand new mode for prolonging the service life of the electric furnace and has good practical value.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a jointing material for reducing oxidation of an electric furnace magnesia carbon brick, and a preparation method and a use method thereof.
Background
The magnesia carbon brick has the advantages of high melting temperature, strong slag erosion resistance, good thermal shock resistance, high heat conductivity coefficient and the like, and is widely applied to metallurgical high-temperature equipment such as a steelmaking electric furnace, a converter and the like. Since carbon is easily oxidized, the atmosphere is an important factor affecting the service life of the magnesia carbon brick. The sampling analysis of the magnesia carbon brick residue of a steel climbing intermittent electric furnace shows that the oxidation and decarburization phenomena are generated at the tail part of the magnesia carbon brick close to the water-cooled wall, particularly the carbon content in the magnesia carbon brick at the gap between the two water-cooled furnace walls is reduced to below 3 percent from 14 percent of a new brick, and the service life of the electric furnace is seriously influenced.
At present, no effective solution is provided for the problem of short service life caused by oxidation of magnesia carbon bricks at the tail of an electric furnace, and only a new magnesia carbon brick can be replaced after the magnesia carbon bricks are oxidized.
A large amount of refractory bricks such as waste magnesia carbon bricks, high-alumina bricks and the like are produced in various furnaces such as steel-climbing electric furnaces, converters, heating furnaces and the like every year. At present, the waste magnesia carbon bricks and high-alumina bricks are generally subjected to simple pretreatment such as crushing, screening and the like, and then are sold to a refractory factory, and the refractory factory processes the waste magnesia carbon bricks and high-alumina bricks into materials with different grain sizes to produce refractory products. Besides direct takeaway treatment, some recycling methods related to waste magnesia carbon bricks and other materials are developed at present. Patent CN111172348A discloses a method for recycling waste magnesia carbon bricks of a steel converter, which mixes crushed waste magnesia carbon bricks with dolomite powder and magnesite powder, adds a binder and water pressure to prepare a block mass, and is used for partially or completely replacing slag splashing magnesium balls, thereby achieving the effect of slag splashing furnace protection of the converter.
On the other hand, the processing processes of lathes, drilling machines, milling machines and the like can generate scrap iron, and the iron is fluffy, has high oil stain content, is easy to pollute the environment and has low takeout price. About 5 million tons of vanadium extraction sludge is generated in steel climbing and vanadium extraction steel making every year, the iron content is high, the TFe content is about 80 percent, and the MFe content is about 50 percent. Patent CN102251068A discloses a vanadium extraction coolant and a preparation method thereof, wherein vanadium extraction sludge, iron ore concentrate and iron scale are added with a binder according to a certain proportion and are pressed into lumps under water pressure, the vanadium extraction coolant is mainly used for reducing the temperature of molten steel during vanadium extraction in a steel-climbing converter, avoiding carbon oxidation in the molten steel and simultaneously recovering iron elements in the vanadium extraction sludge.
At present, no report that the joint pointing material prepared by adopting waste high-alumina bricks and vanadium extraction sludge is used for reducing the oxidation of the magnesia carbon bricks of the electric furnace is found.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the magnesia carbon brick of the electric furnace is easy to oxidize and has short service life.
The technical scheme for solving the technical problems comprises the following steps: provides a jointing material for reducing the oxidation of magnesia carbon bricks of an electric furnace. The jointing material comprises the following components: 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium extraction sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent.
Wherein, in the jointing material for reducing the oxidation of the magnesia carbon bricks of the electric furnace, the waste high-alumina bricks are Al2O3High-alumina brick with content of 68.07-74.77%.
In the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, the mass percentage of the waste high-alumina brick with the granularity of 0.074 mm-2 mm is more than or equal to 80 percent, and the mass percentage of the waste high-alumina brick with the granularity of less than 0.074mm is less than or equal to 17 percent.
In the jointing material for reducing the oxidation of the magnesia carbon bricks of the electric furnace, the content of TFe in the vanadium extraction sludge is 78.58-83.70%, the content of MFe is 48.30-53.67%, and the water content is less than or equal to 1%.
Wherein, in the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, the granularity of the scrap iron is less than or equal to 4 mm.
In the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, the bonding agent comprises the following components: 1.5-1.8 parts of modified starch, 0.02-0.05 part of xanthan gum and 0.13-0.2 part of polyacrylamide.
The invention also provides a preparation method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, which comprises the following steps: taking 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium-extracting sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent, carrying out dry mixing and stirring for 3-5 min, adding 7-9% of water, and mixing for 4-7 min.
The invention also provides a use method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, which comprises the following steps: when the electric furnace is built, the pointing material is filled between the two water-cooled wall gaps of the electric furnace.
In the use method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, the jointing material needs to be used within 2 hours after being manufactured.
Compared with the prior art, the invention has the beneficial effects that:
the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace is prepared by reasonably proportioning waste magnesia carbon bricks, waste scrap iron, vanadium-extracting sludge and other waste raw materials, is filled between two water-cooled wall gaps of the electric furnace, can prevent oxygen in the air from entering the magnesia carbon brick, and simultaneously can consume certain oxygen due to components in the jointing material, further reduce the oxygen entering the magnesia carbon brick, greatly slow down the oxidation speed, keep the C content of the magnesia carbon brick at the tail part of the electric furnace at 9.3-10.5%, prolong the service life of the magnesia carbon brick and reduce the smelting cost of the electric furnace. The jointing material is specially used in the electric furnace, prevents magnesia carbon bricks from being oxidized, provides a brand new mode for prolonging the service life of the electric furnace, and has good practical value.
Detailed Description
The invention provides a jointing material for reducing oxidation of an electric furnace magnesia carbon brick, which comprises the following components: 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium extraction sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent.
The joint pointing material is prepared by adopting waste high-alumina bricks, vanadium extraction sludge, scrap iron and a bonding agent, and is used for filling the gaps between the water-cooled walls of the electric furnace. The raw materials are adopted to prepare the jointing material, and the material can fill the gap between the two water-cooled walls, so that the amount of air entering the magnesia carbon brick of the electric furnace is reduced; the MFe in the jointing material can also consume a part of oxygen in the air, the volume of the MFe is increased after oxidation, and gaps in the jointing material can be further reduced.
The jointing material is filled from bottom to top, is densely filled, has the same thickness as a water-cooled wall, has a smooth surface, and is preferably used within 2 hours after being prepared in order to prevent the jointing material from caking and reduce the bonding property.
Wherein it is made wasteThe old high-alumina brick has rich yield, wide source and low cost. Calculating Al below 2000 ℃ by using Factsage thermodynamic software2O3And MgO can form magnesium aluminate spinel (MgAl)2O4) MgO-MgAl based on MgO with very high refractoriness2O4The refractory degree is high, the service life can be prolonged, and the slag can not be melted by the slag and enter a slag phase.
Wherein, in the jointing material for reducing the oxidation of the magnesia carbon bricks of the electric furnace, the waste high-alumina bricks are Al2O3High-alumina brick with content of 68.07-74.77%.
The granularity is closely related to the effect of the jointing material, the strength of the jointing material is reduced and the porosity (gap) is large when the granularity is too large; the granularity is too fine, dry-mixed dust is large, and the using amount of the bonding agent is large, so that the filling effect of the jointing material can be reduced. The invention is determined by a large number of screening tests, the waste high-alumina brick has the best effect when the mass proportion of the granularity of 0.074 mm-2 mm is more than or equal to 80 percent, and the mass proportion of the granularity of less than 0.074mm is less than or equal to 17 percent.
In the jointing material for reducing the oxidation of the magnesia carbon bricks of the electric furnace, the content of TFe in the vanadium extraction sludge is 78.58-83.70%, the content of MFe is 48.30-53.67%, and the water content is less than or equal to 1%.
In the vanadium extraction sludge adopted by the invention, MFe, FeO and Fe are used2O3The density is respectively 7.87t/m3、5.7t/m3And 5.24t/m3The MFe oxidation is a process of volume increase, the vanadium extraction sludge has high iron content and is used as a gap pointing material between water-cooled furnace walls, the porosity is further reduced, and the air permeability is reduced.
In addition, because the original vanadium-extracting sludge has fine granularity and poor filling effect, scrap iron is particularly added into the pointing material, the scrap iron is produced by processing metal iron or steel by a lathe, a drilling machine, a milling machine or a sawing machine, basically all the scrap iron is MFe, the source is wide, and the price is low. The method mainly adjusts the particle size of the vanadium extraction sludge by using scrap iron, comprehensively considers the addition cost of a bonding agent, the compressive strength, the porosity and the like of the pointing material, adjusts the particle size of the vanadium extraction sludge by using the scrap iron (shown in table 1), and obtains the pointing material with higher compressive strength (the compressive strength can reach 53Mpa after being dried under the condition of 20KN forming pressure) and lower porosity (13.95%) through proper proportion.
TABLE 1 vanadium extraction sludge and iron filings + vanadium extraction sludge granulometric composition
| Particle size range | ＞2mm | 0.15～2mm | 0.074～0.15mm | ＜0.074 |
| Vanadium extraction sludge particle size/%) | 0～0.13 | 24.22～26.86 | 52.31～54.55 | 19.57～22.23 |
| Iron filings plus vanadium-extracted sludge granularity/%) | 15.73～21.84 | 19.98～21.55 | 41.81～45.08 | 16.35～17.63 |
Wherein, in the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, the granularity of the scrap iron is less than or equal to 4 mm.
On the other hand, the iron oxide can be used for filling the inner gap of the jointing material by using the iron chips, so that the air infiltration amount is reduced.
After the main raw materials of the pointing material are determined, the binding agent matched with the pointing material is specially selected according to the characteristics of the raw materials. Modified starch is adopted to make the surface of the material sticky, so that the phenomenon of uneven stirring caused by too large density difference between the scrap iron particles and the waste high-alumina bricks is avoided; the xanthan gum can remove oil stains on the surfaces of the scrap irons and reduce the water rejection of the oil stains; by adopting polyacrylamide and modified starch, Al in waste high-alumina bricks can be reduced2O3The wetting angle between the filler and iron-containing substances such as MFe, FeO and the like in the iron chips and the vanadium extraction sludge improves the strength of the jointing material. After a large number of screening tests, the invention determines that the composition of the binding agent comprises: 1.5-1.8 parts of modified starch, 0.02-0.05 part of xanthan gum and 0.13-0.2 part of polyacrylamide.
The invention also provides a preparation method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, which comprises the following steps: taking 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium-extracting sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent, carrying out dry mixing and stirring for 3-5 min, adding 7-9% of water, and mixing for 4-7 min.
The invention also provides a use method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace, which comprises the following steps: when the electric furnace is built, the pointing material is filled between the two water-cooled wall gaps of the electric furnace.
The following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1 use of pointing material of the present invention to reduce oxidation of magnesia carbon bricks in electric furnaces
When a 5KVA direct current electric arc furnace is built in a laboratory, 32 parts of crushed waste high-alumina bricks, 55 parts of vanadium-extracting sludge, 13 parts of sawing machine scrap iron, 1.6 parts of modified starch, 0.03 part of xanthan gum and 0.15 part of polyacrylamide are adopted, and a small mortar mixer is used for dry mixing for 5min, adding 7% of water and wet mixing for 5min to prepare a jointing material;
in this example, Al is present in the crushed waste high-alumina bricks2O373.55% of particle sizeThe mass ratio of the particles is between 0.074mm and 2mm is 84.1 percent, and the mass ratio of the particles below 0.074mm is 15.3 percent.
The TFe content of the vanadium extraction sludge is 79.38 percent, and the MFe content is 51.22 percent. Particle size: more than or equal to 0 percent of 2mm, 25.48 percent of 0.15 mm-2 mm, 53.67 percent of 0.074 mm-0.15 mm and less than or equal to 20.85 percent of 0.074.
Filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 10.07-10.5%.
Example 2 use of pointing material of the present invention to reduce oxidation of magnesia carbon bricks in electric furnaces
When a 5KVA direct current electric arc furnace is built in a laboratory, 31 parts of crushed waste high-alumina bricks, 58 parts of vanadium-extracting sludge, 11 parts of sawing machine scrap iron, 1.6 parts of modified starch, 0.03 part of xanthan gum and 0.15 part of polyacrylamide are adopted, and a small mortar mixer is used for dry mixing for 5min, adding 7% of water and wet mixing for 5min to prepare a pointing material;
in this example, Al is present in the crushed waste high-alumina bricks2O3The content is 70.39%, the mass percentage of the particles with the diameter of 0.074 mm-2 mm is 82.9%, and the mass percentage of the particles with the diameter of less than 0.074mm is 14.3%.
The content of TFe in the vanadium extraction sludge is 82.98%, the content of MFe is 52.731%, and the particle size is as follows: 0.09% of more than or equal to 2mm, 26.53% of 0.15-2 mm, 53.48% of 0.074-0.15 mm and 19.9% of less than or equal to 0.074.
Filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 9.5-10.1%.
Example 3 reduction of Oxidation of electric furnace magnesia carbon bricks Using the pointing Material of the invention
When a 5KVA direct current electric arc furnace is built in a laboratory, 35 parts of crushed waste high-alumina bricks, 54 parts of vanadium-extracting sludge, 11 parts of sawing machine scrap iron, 1.6 parts of modified starch, 0.03 part of xanthan gum and 0.15 part of polyacrylamide are adopted, and a small mortar mixer is used for dry mixing for 5min, adding 7% of water and wet mixing for 5min to prepare a jointing material;
in this example, Al is present in the crushed waste high-alumina bricks2O369.57% and has a particle diameter of 0.0780.41% of the mixture with the mass ratio of 4 mm-2 mm and 16.44% of the mixture with the mass ratio of less than 0.074 mm.
The content of TFe in the vanadium extraction sludge is 81.61%, the content of MFe is 49.91%, and the particle size is as follows: the mass ratio of more than or equal to 2mm is 0 percent, the mass ratio of 0.15 mm-2 mm is 24.57 percent, the mass ratio of 0.074 mm-0.15 mm is 53.41 percent, and the mass ratio of less than or equal to 0.074 is 22.02 percent.
Filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 9.3-9.7%.
Comparative example 1 smelting with an existing electric furnace
When a 5KVA direct current electric arc furnace in a laboratory is built, no material is filled between water-cooled walls and between the water-cooled walls and the magnesia carbon bricks, the magnesia carbon bricks are disassembled after smelting for 10 days to detect the carbon content at the tail parts of the magnesia carbon bricks, and the C content is 0.5-2.9%.
Comparative example 2 filling other pointing materials for smelting
When a 5KVA direct current electric arc furnace in a laboratory is built, joint pointing materials for a blast furnace are filled between water-cooled walls, and a magnesia carbon brick is disassembled after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 5.9-6.7%.
Compared with the embodiment 1, the blast furnace jointing material is filled between the water-cooled walls, and the carbon content at the tail of the magnesia carbon brick at the seam of the water-cooled wall is 5.9-6.7%.
Comparative example 3 filling other pointing materials for smelting
When a 5KVA direct current electric arc furnace is built in a laboratory, 40 parts of crushed waste high-alumina bricks, 40 parts of vanadium-extracting sludge, 20 parts of sawing machine scrap iron, 1.6 parts of modified starch, 0.03 part of xanthan gum and 0.15 part of polyacrylamide are adopted, and a small mortar mixer is used for dry mixing for 5min, adding 7% of water and wet mixing for 5min to prepare a jointing material;
filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 6.3-7.1%.
Filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 6.3-7.1%.
Comparative example 4 filling other pointing materials for smelting
When a 5KVA direct current electric arc furnace is built in a laboratory, 35 parts of crushed waste high-alumina bricks, 54 parts of vanadium-extracting sludge, 11 parts of sawing machine scrap iron, 1.3 parts of modified starch and 0.4 part of polyvinyl alcohol are dry-mixed for 5min by using a small mortar mixer, 7 percent of water is added, and wet mixing is carried out for 5min to prepare a jointing material;
filling jointing materials in gaps of the water-cooled wall, and removing the magnesia carbon brick after smelting for 10 days to detect the carbon content at the tail part of the magnesia carbon brick, wherein the C content is 6.8-7.9%.
The embodiment and the comparative example show that the joint pointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace is provided, and the joint pointing material specially made by the invention is filled in the gap between the water cooled walls of the electric furnace, so that the oxidation of the magnesia carbon brick of the electric furnace can be prevented, and the service life of the electric furnace is fundamentally prolonged. The invention has simple operation principle, low cost and obvious economic benefit.
Claims (9)
1. Reduce colluding seam material of electric stove magnesia carbon brick oxidation, its characterized in that constitutes and includes: 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium extraction sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent.
2. The joint compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 1, which is characterized in that: the waste high-alumina brick is Al2O3High-alumina brick with content of 68.07-74.77%.
3. The joint compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 1, which is characterized in that: the mass ratio of the waste high-alumina brick granularity between 0.074mm and 2mm is more than or equal to 80 percent, and the mass ratio below 0.074mm is less than or equal to 17 percent.
4. The joint compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 1, which is characterized in that: the vanadium extraction sludge contains 78.58-83.70% of TFe, 48.30-53.67% of MFe and less than or equal to 1% of water.
5. The joint compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 1, which is characterized in that: the particle size of the scrap iron is less than or equal to 4 mm.
6. The joint compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 1, which is characterized in that: the binding agent comprises the following components: 1.5-1.8 parts of modified starch, 0.02-0.05 part of xanthan gum and 0.13-0.2 part of polyacrylamide.
7. The preparation method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace according to any one of the claims 1 to 6, which is characterized by comprising the following steps: taking 31-35 parts of waste high-alumina bricks, 54-59 parts of vanadium-extracting sludge, 10-15 parts of scrap iron and 1.65-2.05 parts of a binding agent, carrying out dry mixing and stirring for 3-5 min, adding 7-9% of water, and mixing for 4-7 min.
8. The use method of the jointing compound for reducing the oxidation of the magnesia carbon brick of the electric furnace according to any one of the claims 1 to 6, is characterized by comprising the following steps: when the electric furnace is built, the pointing material is filled between the two water-cooled wall gaps of the electric furnace.
9. The use method of the jointing material for reducing the oxidation of the magnesia carbon brick of the electric furnace according to claim 8, is characterized in that: the jointing material needs to be used within 2 hours after being manufactured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010883788.0A CN111960835B (en) | 2020-08-28 | 2020-08-28 | Pointing material for reducing oxidation of electric furnace magnesia carbon brick and preparation and use methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010883788.0A CN111960835B (en) | 2020-08-28 | 2020-08-28 | Pointing material for reducing oxidation of electric furnace magnesia carbon brick and preparation and use methods thereof |
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