CN115947589A - Converter lining gunning mix with strong adhesive force - Google Patents
Converter lining gunning mix with strong adhesive force Download PDFInfo
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- CN115947589A CN115947589A CN202210887902.6A CN202210887902A CN115947589A CN 115947589 A CN115947589 A CN 115947589A CN 202210887902 A CN202210887902 A CN 202210887902A CN 115947589 A CN115947589 A CN 115947589A
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- 239000000853 adhesive Substances 0.000 title claims abstract description 17
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 17
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 151
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 76
- 239000000843 powder Substances 0.000 claims abstract description 68
- 239000002245 particle Substances 0.000 claims abstract description 67
- 239000000203 mixture Substances 0.000 claims abstract description 53
- 238000005245 sintering Methods 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 27
- 239000007767 bonding agent Substances 0.000 claims abstract description 26
- 239000002283 diesel fuel Substances 0.000 claims abstract description 26
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000005011 phenolic resin Substances 0.000 claims abstract description 18
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 18
- 239000010426 asphalt Substances 0.000 claims abstract description 15
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 13
- 239000010452 phosphate Substances 0.000 claims abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 3
- 239000004571 lime Substances 0.000 claims abstract description 3
- 238000002156 mixing Methods 0.000 claims description 30
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 238000005303 weighing Methods 0.000 claims description 15
- 239000011230 binding agent Substances 0.000 claims description 14
- 239000001095 magnesium carbonate Substances 0.000 claims description 14
- 235000014380 magnesium carbonate Nutrition 0.000 claims description 14
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims description 14
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims description 14
- 229960005191 ferric oxide Drugs 0.000 claims description 13
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 11
- 229910052593 corundum Inorganic materials 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 230000008439 repair process Effects 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 235000012239 silicon dioxide Nutrition 0.000 claims description 10
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 10
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 8
- MYFXBBAEXORJNB-UHFFFAOYSA-N calcium cyanamide Chemical compound [Ca+2].[N-]=C=[N-] MYFXBBAEXORJNB-UHFFFAOYSA-N 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 239000007921 spray Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 5
- 239000010959 steel Substances 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 239000012298 atmosphere Substances 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 238000009628 steelmaking Methods 0.000 abstract description 2
- 235000012245 magnesium oxide Nutrition 0.000 description 63
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 8
- 239000013078 crystal Substances 0.000 description 8
- 239000011449 brick Substances 0.000 description 5
- 239000011777 magnesium Substances 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 230000008018 melting Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000280 densification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000001953 recrystallisation Methods 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Ceramic Products (AREA)
Abstract
The invention provides a converter lining gunning mix with strong adhesive force, and relates to the technical field of converter steelmaking. The converter lining gunning mix with strong adhesive force comprises the following raw materials in parts by weight: 30-50 parts of high-purity sintered magnesia particles, 25-35 parts of fused magnesia particles, 20-40 parts of fused magnesia fine powder, 10.5-29.5 parts of a bonding agent and 1-3 parts of diesel oil, wherein the bonding agent comprises the following raw materials in parts by weight: 1-5 parts of medium-temperature modified asphalt, 1-5 parts of powdery phenolic resin, 1-5 parts of phosphate, 2-5 parts of lime powder, 2-4 parts of alpha-Al 2O3 powder, 0.5-1.5 parts of sintering aid and 3-5 parts of flow aid. Through the introduction of diesel oil, the gunning material avoids the use of water, avoids the problem of corrosion of external moisture to the lining of the converter, avoids the problem of damaging the atmosphere in the converter when water enters the converter, avoids the hidden dangers of safety, steel leakage and the like caused by the water entering the converter, and simultaneously fully sinters the inside of the gunning material under the action of high temperature, thereby improving the sintering efficiency.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a converter lining gunning mix with strong adhesive force.
Background
The lining of the converter for smelting molten steel is easy to be eroded by molten steel and molten slag, if the lining is not repaired in time, partial areas of the converter can be damaged in advance, the times of repairing the converter are increased, the service life of the converter is reduced, and unnecessary economic loss is caused.
At present, the gunning mix is generally sprayed to the lining of a converter in a plastic shape at a high speed after being mixed with water at a spray gun under the delivery of high-pressure gas, the water content is generally about 15 percent, after the gunning mix enters the converter, one part of the water of the gunning mix is boiled and volatilized rapidly, the other part of the water is combined with the gunning mix and distributed on the periphery of a tubular brick for sintering, so as to achieve the purpose of protecting the tubular brick, but the lining of the converter is built by magnesia carbon bricks, a large amount of water enters the converter with high temperature, so that the working face of part of the lining brick is hydrated rapidly to form Mg (OH) 2 The brick body is pulverized, expanded and loosened to lose the function of the lining, and the existence of water in the furnace not only destroys the atmosphere in the furnace, but also has hidden dangers in various aspects such as safety, steel leakage and the like.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the converter lining gunning mix with strong adhesive force, and solves the problems that the converter lining is corroded by the watery gunning mix and potential safety hazards are caused.
In order to realize the purpose, the invention is realized by the following technical scheme: the converter lining gunning mix with strong adhesive force comprises the following raw materials in parts by weight: 30-50 parts of high-purity sintered magnesia particles, 25-35 parts of fused magnesia particles, 20-40 parts of fused magnesia fine powder, 10.5-29.5 parts of a bonding agent and 1-3 parts of diesel oil.
Preferably, the binding agent comprises the following raw materials in parts by weight: 1-5 parts of medium-temperature modified asphalt, 1-5 parts of powdery phenolic resin, 1-5 parts of phosphate, 2-5 parts of lime powder, 2-4 parts of a-Al2O3 powder, 0.5-1.5 parts of sintering aid and 3-5 parts of flow aid.
Preferably, the particle size of the high-purity sintered magnesia particles is 1-3mm, the particle size of the fused magnesia particles is 0.15-1mm, and the particle size of the fused magnesia fine powder is less than 0.15mm.
Preferably, the sintering aid adopts iron oxide red powder, and the flow aid adopts silicon dioxide micro powder.
Preferably, the preparation method of the binding agent comprises the following steps:
the medium-temperature modified asphalt, powdery phenolic resin, silicon dioxide micro powder, ferric oxide red powder, powdery phenolic resin, phosphate, nitrolime powder and a-Al2O3 powder are respectively put into a stirrer according to a proportion and are fully stirred and mixed to prepare the bonding agent.
Preferably, the preparation method of the converter lining gunning mix with strong adhesion comprises the following steps:
weighing high-purity sintered magnesia particles and fused magnesia particles according to the weight, and adding the high-purity sintered magnesia particles and the fused magnesia particles into a mixing mill for uniformly mixing;
weighing diesel oil according to the quantity, adding the diesel oil into a mixing mill, and uniformly mixing to ensure that the diesel oil completely wets magnesia particles;
and step three, weighing the fused magnesia fine powder and the prepared bonding agent according to the amount, adding the fused magnesia fine powder and the prepared bonding agent into a mixing mill, and uniformly stirring and mixing to obtain the gunning mix.
Preferably, the use method of the converter lining gunning material with strong adhesion comprises the following steps:
firstly, conveying the prepared gunning mix through high-pressure gas, and shooting the gunning mix to the lining of the converter in a plastic state at a high speed at a spray gun;
secondly, after the gunning refractory is attached to the hot converter lining, the gunning refractory fills and repairs the gap, namely the pit, of the converter lining and forms a material layer with a certain thickness on the converter lining substrate;
and step three, sintering the gunning material by using the temperature in the converter, wherein the sintering time is about 15 minutes.
The invention provides a gunning mix for a converter lining, which has strong adhesive force. The method has the following beneficial effects:
1. according to the invention, by introducing diesel oil, the gunning material avoids the use of water, the problem of corrosion of external moisture to the lining of the converter is avoided, the problem of damage to the atmosphere in the converter caused by water entering the converter is avoided, the hidden dangers in various aspects such as safety, steel leakage and the like caused by water entering the converter are avoided, meanwhile, the interior of the gunning material is fully sintered under the action of high temperature, and the sintering efficiency is improved.
2. According to the invention, the high-quality medium-temperature modified asphalt in the bonding agent enables the repair material to have good flowing property at a high temperature, and the asphalt is matched with the powdery phenolic resin to form a uniform and staggered carbon network structure in the sintering process, so that the adhesion force after sintering is improved.
3. The sintering aid iron oxide red powder is introduced, so that the sintering is promoted, and the strength of the repair material is improved by reaction at a high temperature.
4. The invention leads phosphate and nitrolime powder to form calcium phosphate with different melting points at high temperature, and simultaneously, magnesia particles and the phosphate react to generate liquid-phase solid solution to play a role in promoting combination.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a converter lining gunning mix with strong adhesive force, which comprises the following raw materials in parts by weight: 40 parts of high-purity sintered magnesia particles, 30 parts of fused magnesia fine powder, 20 parts of a bonding agent and 2 parts of diesel oil.
The particle size of the high-purity sintered magnesite is 1-3mm, the particle size of the high-purity sintered magnesite is the critical particle size of a material sprayed and distributed by the converter, the particle size of the fused magnesite is 0.15-1mm, and the particle size of the fused magnesite fine powder is less than 0.15mm.
The main components of the high-purity sintered magnesia particles, the fused magnesia particles and the fused magnesia fine powder are magnesium oxide, the main crystal phase is periclase, the melting point is 2800 ℃, the high-temperature performance is stable, the attachment rate or rebound loss of the gunning mix is directly influenced by the granularity composition of the gunning mix, particularly the density, porosity and tissue structure of the gunning mix are influenced, the grain thickness is strictly proportioned, too much or too little grains can influence the density of the gunning mix, and the proportioning is fully adjusted and selected.
Through the introduction of diesel oil, the particles are fully wetted, the interior of the repair material is fully sintered under the action of high temperature, the sintering efficiency is improved, the use of water is avoided, and the problem that external moisture corrodes the lining of the converter is further avoided.
The binding agent comprises the following raw materials in parts by weight: 3 parts of medium-temperature modified asphalt, 3 parts of powdery phenolic resin, 3 parts of phosphate, 3 parts of lime nitrate powder, 3 parts of a-Al2O3 powder, 1 part of sintering aid and 4 parts of flow aid.
As the melting point of the magnesite is very high and the melting is very difficult, the lime-nitrate powder fluxing agent which is mainly added with CaO plays an important role in sintering densification due to the growth of crystal grains in the later sintering period, but if secondary recrystallization or discontinuous crystal grains grow too fast, the phenomenon of reverse densification is caused by the coarsening of the crystal grains and the widening of crystal boundaries, and the microtexture of the product is influenced. In this case, the abnormal growth of crystal grains can be suppressed by adding a-Al2O3 powder, and the magnesia-alumina spinel formed by MgO and Al2O3 is distributed among MgO particles, thereby suppressing the growth of crystal grains and promoting the elimination of pores.
The sintering aid adopts iron oxide red powder, and the flow aid adopts silicon dioxide micro powder.
The asphalt in the binder is modified at medium temperature, so that the repair material has good flow property at high temperature, the asphalt is matched with powdery phenolic resin to form a uniform and staggered carbon network structure in the sintering process, iron oxide red powder reacts with periclase at 600 ℃ to generate magnesium ferrite, the magnesium ferrite can be obviously dissolved in the periclase at the temperature of more than 1000 ℃ to generate magnesiowustite, the dissolving amount is increased along with the temperature rise, the magnesium ferrite in the magnesiowustite is dissolved in the periclase to form an aliovalent solid solution with vacant sites in cation lattices, higher crystal energy is stored, and the activity is improved, so that the sintering and recrystallization of the periclase can be obviously improved, and the iron oxide red powder of the sintering aid is introduced to play a role in promoting the sintering, and the strength of the repair material is improved by reaction at high temperature.
The preparation method of the bonding agent in this example includes the following steps:
the medium-temperature modified asphalt, powdery phenolic resin, silicon dioxide micro powder, ferric oxide red powder, powdery phenolic resin, phosphate, nitrolime powder and a-Al2O3 powder are respectively put into a stirrer according to a proportion and are fully stirred and mixed to prepare the bonding agent.
The preparation method of the converter lining gunning mix with strong adhesive force in the embodiment comprises the following steps:
weighing high-purity sintered magnesia particles and fused magnesia particles according to the weight, and adding the high-purity sintered magnesia particles and the fused magnesia particles into a mixing mill for uniformly mixing;
weighing diesel oil according to the quantity, adding the diesel oil into a mixing mill, and uniformly mixing to ensure that the diesel oil completely wets magnesia particles;
and step three, weighing the fused magnesia fine powder and the prepared bonding agent according to the amount, adding the fused magnesia fine powder and the prepared bonding agent into a mixing mill, and uniformly stirring and mixing to obtain the gunning mix.
The application method of the converter lining gunning mix with strong adhesive force in the embodiment comprises the following steps:
firstly, conveying the prepared gunning mix through high-pressure gas, and shooting the gunning mix to the lining of the converter in a plastic state at a high speed at a spray gun;
secondly, after the gunning material is attached to a hot converter lining, the gunning material fills and repairs a gap, namely a pit, of the converter lining and forms a material layer with a certain thickness on a converter lining substrate;
and step three, sintering the gunning material by using the temperature in the converter, wherein the sintering time is about 15 minutes.
The binder is stirred and mixed uniformly, the magnesite grains with different grain diameters are stirred and mixed uniformly, the evenly mixed magnesite grains are fully mixed with the diesel oil, and finally the binder is added and mixed uniformly, so that the component content of each unit of gunning mix is equal, and the influence of uneven material ratio on the performance of a product is avoided.
Example two:
the embodiment of the invention provides a converter lining gunning mix with strong adhesive force, which comprises the following raw materials in parts by weight: 50 parts of high-purity sintered magnesia particles, 35 parts of fused magnesia particles, 40 parts of fused magnesia fine powder, 29.5 parts of a bonding agent and 3 parts of diesel oil.
The particle size of the high-purity sintered magnesia particles is 1-3mm, the particle size of the high-purity sintered magnesia particles is the critical particle size of a material sprayed and distributed by a converter, the particle size of the fused magnesia particles is 0.15-1mm, and the particle size of the fused magnesia fine powder is less than 0.15mm.
The binding agent comprises the following raw materials in parts by weight: 5 parts of medium-temperature modified asphalt, 5 parts of powdery phenolic resin, 5 parts of phosphate, 5 parts of lime nitrate powder, 4 parts of a-Al2O3 powder, 1.5 parts of sintering aid and 5 parts of flow aid.
The sintering aid adopts iron oxide red powder, and the flow aid adopts silicon dioxide micro powder.
The preparation method of the bonding agent in this example includes the following steps:
the medium-temperature modified asphalt, powdery phenolic resin, silicon dioxide micropowder, ferric oxide red powder, powdery phenolic resin, phosphate, nitrolime powder and alpha-Al 2O3 powder are respectively put into a stirrer according to a proportion and are fully stirred and mixed to prepare the bonding agent.
The preparation method of the converter lining gunning mix with strong adhesive force in the embodiment comprises the following steps:
weighing high-purity sintered magnesia particles and fused magnesia particles according to the weight, and adding the high-purity sintered magnesia particles and the fused magnesia particles into a mixing mill for uniformly mixing;
weighing diesel oil according to the quantity, adding the diesel oil into a mixing mill, and uniformly mixing to ensure that the diesel oil completely wets magnesia particles;
and step three, weighing the fused magnesia fine powder and the prepared bonding agent according to the amount, adding the fused magnesia fine powder and the prepared bonding agent into a mixing mill, and uniformly stirring and mixing to obtain the gunning mix.
The application method of the converter lining gunning mix with strong adhesive force in the embodiment comprises the following steps:
firstly, conveying the prepared gunning mix through high-pressure gas, and shooting the gunning mix to the lining of the converter in a plastic state at a high speed at a spray gun;
secondly, after the gunning refractory is attached to the hot converter lining, the gunning refractory fills and repairs the gap, namely the pit, of the converter lining and forms a material layer with a certain thickness on the converter lining substrate;
and step three, sintering the gunning material by using the temperature in the converter, wherein the sintering time is about 15 minutes.
The binder is stirred and mixed uniformly, the magnesite grains with different grain diameters are stirred and mixed uniformly, the evenly mixed magnesite grains are fully mixed with the diesel oil, and finally the binder is added and mixed uniformly, so that the component content of each unit of gunning mix is equal, and the influence of uneven material ratio on the performance of a product is avoided.
Example three:
the embodiment of the invention provides a converter lining gunning mix with strong adhesive force, which comprises the following raw materials in parts by weight: 30 parts of high-purity sintered magnesia particles, 25 parts of fused magnesia particles, 20 parts of fused magnesia fine powder, 10.5 parts of a bonding agent and 1 part of diesel.
The particle size of the high-purity sintered magnesia particles is 1-3mm, the particle size of the high-purity sintered magnesia particles is the critical particle size of a material sprayed and distributed by a converter, the particle size of the fused magnesia particles is 0.15-1mm, and the particle size of the fused magnesia fine powder is less than 0.15mm.
The binding agent comprises the following raw materials in parts by weight: 1 part of medium-temperature modified asphalt, 1 part of powdery phenolic resin, 1 part of phosphate, 2 parts of lime nitrate powder, 2 parts of a-Al2O3 powder, 0.5 part of sintering aid and 3 parts of flow aid.
The sintering aid adopts iron oxide red powder, and the flow aid adopts silicon dioxide micro powder.
The preparation method of the bonding agent in this example includes the following steps:
the medium-temperature modified asphalt, powdery phenolic resin, silicon dioxide micro powder, ferric oxide red powder, powdery phenolic resin, phosphate, nitrolime powder and a-Al2O3 powder are respectively put into a stirrer according to a proportion and are fully stirred and mixed to prepare the bonding agent.
The preparation method of the converter lining gunning mix with strong adhesive force in the embodiment comprises the following steps:
weighing high-purity sintered magnesia particles and fused magnesia particles according to the weight, and adding the high-purity sintered magnesia particles and the fused magnesia particles into a mixing mill for uniformly mixing;
weighing diesel oil according to the quantity, adding the diesel oil into a mixing mill, and uniformly mixing to ensure that the diesel oil completely wets magnesia particles;
and step three, weighing the fused magnesia fine powder and the prepared bonding agent according to the amount, adding the fused magnesia fine powder and the prepared bonding agent into a mixing mill, and uniformly stirring and mixing to obtain the gunning mix.
The application method of the gunning mix for the converter lining with strong adhesion in the embodiment comprises the following steps:
firstly, conveying the prepared gunning mix through high-pressure gas, and shooting the gunning mix to the lining of the converter in a plastic state at a high speed at a spray gun;
secondly, after the gunning refractory is attached to the hot converter lining, the gunning refractory fills and repairs the gap, namely the pit, of the converter lining and forms a material layer with a certain thickness on the converter lining substrate;
and step three, sintering the gunning material by using the temperature in the converter, wherein the sintering time is about 15 minutes.
The binder is stirred and mixed uniformly, the magnesite grains with different grain diameters are stirred and mixed uniformly, the evenly mixed magnesite grains are fully mixed with the diesel oil, and finally the binder is added and mixed uniformly, so that the component content of each unit of gunning mix is equal, and the influence of uneven material ratio on the performance of a product is avoided.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. The gunning mix with strong adhesive force for the converter lining is characterized in that: the feed comprises the following raw materials in parts by weight: 30-50 parts of high-purity sintered magnesia particles, 25-35 parts of fused magnesia particles, 20-40 parts of fused magnesia fine powder, 10.5-29.5 parts of a bonding agent and 1-3 parts of diesel oil.
2. The strong-adhesion gunning mix for the lining of the converter, according to claim 1, is characterized in that: the binding agent comprises the following raw materials in parts by weight: 1-5 parts of medium-temperature modified asphalt, 1-5 parts of powdery phenolic resin, 1-5 parts of phosphate, 2-5 parts of lime powder, 2-4 parts of a-Al2O3 powder, 0.5-1.5 parts of sintering aid and 3-5 parts of flow aid.
3. The strong-adhesion gunning mix for the lining of the converter, according to claim 1, is characterized in that: the grain size of the high-purity sintered magnesite grain is 1-3mm, the grain size of the fused magnesite grain is 0.15-1mm, and the grain size of the fused magnesite fine powder is less than 0.15mm.
4. The strong-adhesion gunning mix for the converter lining as claimed in claim 3, wherein: the sintering aid adopts iron oxide red powder, and the flow aid adopts silicon dioxide micro powder.
5. The strong-adhesion gunning mix for the lining of the converter, according to claim 1, is characterized in that: the preparation method of the binding agent comprises the following steps:
the medium-temperature modified asphalt, powdery phenolic resin, silicon dioxide micropowder, ferric oxide red powder, powdery phenolic resin, phosphate, nitrolime powder and alpha-Al 2O3 powder are respectively put into a stirrer according to a proportion and are fully stirred and mixed to prepare the bonding agent.
6. The preparation method of the converter lining gunning mix with strong adhesion according to claim 1, is characterized by comprising the following steps: the method comprises the following steps:
step one, weighing high-purity sintered magnesia particles and fused magnesia particles according to the amount, and adding the high-purity sintered magnesia particles and the fused magnesia particles into a mixing mill for uniformly mixing;
weighing diesel oil according to the quantity, adding the diesel oil into a mixing mill, and uniformly mixing to ensure that the diesel oil completely wets magnesia particles;
and step three, weighing the fused magnesia fine powder and the prepared bonding agent according to the amount, adding the fused magnesia fine powder and the prepared bonding agent into a mixing mill, and uniformly stirring and mixing to obtain the gunning mix.
7. The use method of the converter lining gunning mix with strong adhesion according to claim 1, is characterized in that: the method comprises the following steps:
conveying the prepared gunning mix through high-pressure gas, and shooting the gunning mix to the lining of the converter in a plastic state at a high speed at a spray gun;
secondly, after the gunning refractory is attached to the hot converter lining, the gunning refractory fills and repairs the gap, namely the pit, of the converter lining and forms a material layer with a certain thickness on the converter lining substrate;
and step three, sintering the gunning mix by using the temperature in the converter, wherein the sintering time is about 15 minutes.
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| CN116751067A (en) * | 2023-06-21 | 2023-09-15 | 武汉科技大学 | Water-based large fabric for converter and preparation method thereof |
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