CN102706162A - Wet process for building 3t intermediate frequency electric furnace - Google Patents
Wet process for building 3t intermediate frequency electric furnace Download PDFInfo
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- CN102706162A CN102706162A CN2012101754863A CN201210175486A CN102706162A CN 102706162 A CN102706162 A CN 102706162A CN 2012101754863 A CN2012101754863 A CN 2012101754863A CN 201210175486 A CN201210175486 A CN 201210175486A CN 102706162 A CN102706162 A CN 102706162A
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Abstract
The invention relates to a wet process for building a 3t intermediate frequency electric furnace. By the process, 3t of materials can be melted, and the service life is prolonged. The process comprises the following steps of: (1) manufacturing a steel crucible die which has a shape of a truncated hollow cone; (2) paving an insulation layer and a thermal insulation layer by using two layers of asbestos cloth; (3) paving a furnace bottom, namely paving two layers of asbestos cloth at the furnace bottom in a staggered mode; (4) paving a furnace wall, namely paving two layers of asbestos cloth next to the inner wall of an induction coil from top to bottom, ensuring that each layer is flat and does not have any wrinkle, adhering longitudinal joints for lapping by using water glass, staggering joints of two adjacent layers, and adhering the asbestos cloth which stretches out of the upper plane to a fireproof brick plane at an upper opening of the furnace by using the water glass; (5) preparing a furnace lining material from refined quartz sand; (6) manually knotting a furnace lining, brushing a layer of water glass before filling, and tamping a filler; and (7) baking the furnace and sintering, namely baking only by using firewood after the furnace is built by the wet process, adding 50 to 60kg of firewood into a hearth for several times, and completely combusting to bake the furnace lining.
Description
Technical field
The present invention relates to a kind ofly can either be used for the melting of 3T material, improve the 3t middle frequency furnace wet method furnace building process in service life again, be mainly used in the melting molten iron, promptly the noncontinuity high melt belongs to the middle frequency furnace brickwork and makes the field.
Background technology
CN102278888A, title " 0.5-1 ton intermediate frequency furnace wet method furnace building process ", it is characterized in that carrying out as follows: a. cuts asbestos cloth earlier by the electric furnace size, and prepares the quartz sand compound according to the size of intermediate frequency furnace; The asbestos cloth that b. will cut in advance is distributed on the coil of treating in the brickwork build chamber from top to bottom; C. daubing; D. steel crucible mould is installed; E. furnace wall knotting; F. furnace roof portion knotting; G. effluent trough knotting; H. baker.Its weak point: one is to use the life-span short, and service life only brought up to 15-25 days by 1 ton of intermediate frequency furnace, and 0.5 ton is only arrived 80-90 days, and use cost is high; The 2nd, can't realize the making and the melting of intermediate frequency furnace more than 1 ton.
Summary of the invention
Purpose of design: avoid the disadvantages of background technology part, design and a kind ofly can either be used for the melting of 3T material, improve the 3t middle frequency furnace wet method furnace building process in service life again.
Design: in order to realize above-mentioned purpose of design.1, after the wet method brickwork is accomplished,, be one of technical characterictic of the present invention with the design that firewood toasts furnace lining.The purpose of doing like this is: because that firewood flame has a baking area is big, baking evenly, the advantage that stoving time is short, the firewood that the application is used for baker is merely 50-60kg, divides to add several times in the burner hearth, makes it completing combustion and promptly accomplishes furnace lining is toasted.And after with firewood baking several hours, can feed and carry out melting; And for new brickwork lining, the application can cancel baker one ring, and directly melting is carried out in charging, can practice thrift furnace drying time and baker firewood so greatly, has realized tearing open the same day stove, same day brickwork, blow-on on the same day.2, adopting the design of quartz sand wet method brickwork, is two of technical characterictic of the present invention.The purpose of doing like this is: after adding water in the quartz sand material and mixing, not only can not produce the size segregation phenomenon of quartz sand in wet method knotting process, and furnace lining ties a knot easily, improved the bulk density of furnace lining effectively.3, the steel crucible mould is shaped as the design of truncate hollow cone, is three of technical characterictic of the present invention.The purpose of doing like this is: because the former design of 3t middle frequency furnace steel crucible mould in the background technology is as shown in Figure 2, and the steel crucible mould that it is made up of two truncate hollow cones.The steel crucible mould of this structure has a fatal shortcoming when brickwork, exist the dead angle sand to be difficult for fastening at (I) position exactly, causes at this place easily to metal run out and compelled cupola drop.Steel crucible mould shape after the application improves is as shown in Figure 1, and it is the steel crucible mould of a truncate hollow cone.Conveniently there was not the dead angle in knotting when this improvement made brickwork, and a difficult problem that has fundamentally solved former steel crucible mould (I) position knotting difficulty and be difficult for fastening is one of key that improves furnace life.The steel crucible mould of dry method brickwork is disposable; Promptly whenever build once furnace and just consume 1 steel crucible mould, and the steel crucible mould that the application's wet method brickwork is used is nonvolatil, take out the steel crucible mould after promptly each brickwork finishes; Can continue next time to use, this is first characteristics of wet method brickwork.Because the steel crucible mould is nonvolatil, therefore, after every use once, steel crucible mould surface preferably is coated with one deck antirust oil, prevents to get rusty.Should wipe clean oil before next the use, make steel crucible mould any surface finish, level and smooth, be beneficial to brickwork and finish taking-up easily and can not damage the furnace lining inwall.4, the design of spreading two-layer asbestos cloth near the induction coil inwall is laid in the furnace wall, is four of technical characterictic of the present invention.The purpose of doing like this is: during owing to laying; To go up earlier the back down, every layer of smooth no wrinkle, the longitudinal joint overlap joint clings with waterglass; The adjacent two layers seam staggers; The asbestos cloth water glass bonding that stretches out the about 150mm in plane and fastens with iron block on stove refractory brick suitable for reading plane, and asbestos cloth moves down when preventing brickwork.Lay insulating barrier and heat insulation layer with this method, simple to operation.Facts have proved that result of use is good.The insulating barrier of original 3t middle frequency furnace and heat insulation layer generally are made up of glass wool cloth, micarex, asbestos board, asbestos cloth.But owing to contain more moisture content in the furnace lining material of wet method brickwork; In baker and sintering process, can produce a large amount of steam, discharge smoothly in order to help steam, the insulating barrier of wet method brickwork and heat insulation layer material only adopt two-layer asbestos cloth; And without glass wool cloth, micarex and asbestos board.Asbestos cloth not only insulate but also adiabatic, and simultaneously, gas permeability is better again, and therefore, it is more rational only adopting asbestos cloth during the wet method brickwork, and result of use is good, and simultaneously, the brickwork cost also can reduce significantly.5, furnace lining knotting: the 3t middle frequency furnace is by designing requirement, and the furnace bottom THICKNESS CONTROL is about 150mm, and furnace wall thickness is controlled at about 70mm.Use the manual method tamped lining.Furnace hearth material fastens the back and wipes off, ties with butt hammer again, puts into the steel crucible mould again after furnace bottom thickness and horizontal degree measurement are qualified.The steel crucible mould is put into and will be made that wall thickness is even as far as possible on every side, these available three same thickness, and one the timber wedge greater than the furnace lining wall thickness evenly inserts in around the steel crucible mould less than the furnace lining wall thickness, and the steel crucible mould is pressed in burner hearth center and fixing.Loosening when preventing to tie a knot, put into the quartzy sand pocket of constant weight the steel crucible planted agent, push down the steel crucible mould, prevent that the steel crucible mould is up lifted in the furnace lining knotting process.After the steel crucible mould is fixing, can carry out the furnace lining knotting.Furnace lining should in layer fill and beat real, and every layer thickness is no more than 50mm, and beats reality again after will spreading out and putting on evenly earlier.During artificial knotting, adopt many people operation of putting into several classes, per tour 3 people, i.e. changing shifts in every knotting 10-15 minute requires firmly evenly, and the 3 people slowly rotation transposition of son of sitting around a fire in the knotting process inequality of exerting oneself causes the density difference to avoid each one.In the knotting process, will pay special attention to not break asbestos cloth, otherwise the asbestos cloth damaged location can cause leakage sand, therefore, find that the asbestos cloth damage should mend at once, otherwise will lead to the failure.After furnace lining knotting is accomplished, slowly sling the steel crucible mould with driving, check furnace lining inwall knotting quality then comprehensively, have the part can not replenish and fasten in the consolidation place like discovery.This is the 3rd characteristics of wet method brickwork.This point can't be found also can't remedy during with the dry method brickwork.When slinging the steel crucible mould, raising speed is unsuitable too fast, and should accomplish that the limit knocks steel crucible inwall limit and slowly promote, and prevents to draw the bad furnace lining of newly building.Take out after the steel crucible mould, cut, plane on the furnace lining is tied and fixed fire door exceeding furnace lining asbestos cloth suitable for reading.Plane and tapping hole available water glass mix with furnace lining material as binding agent on furnace lining, brush one deck waterglass before filling earlier, beat reality to filler then.The 4th characteristics of wet method brickwork are after adding water in the furnace lining quartz sand material and mixing, and in wet method knotting process, can not produce the size segregation phenomenon of quartz sand, and furnace lining ties a knot easily, have improved the bulk density of furnace lining effectively.Quartz sand particle is easy to generate segregation during the dry method brickwork, and when especially adopting the vibration brickwork, time of vibration control is improper, the utmost point and produce the quartz sand particle segregation.
Technical scheme: a kind of 3t middle frequency furnace wet method furnace building process, comprise the 3t middle frequency furnace,
⑴The steel crucible mould is shaped as truncate hollow cone;
⑵The laying of insulating barrier and heat insulation layer: adopt two-layer asbestos cloth, asbestos cloth not only insulate but also adiabatic;
⑶Furnace bottom is laid: furnace bottom is spread two-layer asbestos cloth, requires two-layer staggered laying, every layer of smooth no wrinkle;
⑷Lay the furnace wall: spread two-layer asbestos cloth near the induction coil inwall, during laying, go up earlier the back down; Every layer of smooth no wrinkle; The longitudinal joint overlap joint clings with waterglass, and the adjacent two layers seam staggers, and the asbestos cloth water glass bonding that stretches out the plane is on stove refractory brick suitable for reading plane; And fasten with iron block, asbestos cloth moves down when preventing brickwork;
⑸Furnace lining material and preparation thereof: furnace lining material adopts refining quartz sand, the quartz sand chemical composition is required as follows: SiO
2Content should be greater than 98%, alkali metal oxide (k
2O, Na
2O) content should be less than 0.50%, Fe
2O
3Content should be less than 0.75%; Sintering aid adopts boric acid, and to the requirement of its chemical composition: boric acid content is greater than 96%, and sulphates content is less than 0.4%, and oxide content is less than 0.05%, and should sieve through the 70-80 mesh;
⑹Use the manual method tamped lining, furnace hearth material fastens the back and wipes off, ties with butt hammer again, puts into the steel crucible mould again after furnace bottom thickness and horizontal degree measurement are qualified; The steel crucible mould is put into and will be made that wall thickness is even as far as possible on every side, these available three same thickness, and one less than the furnace lining wall thickness; Timber wedge greater than the furnace lining wall thickness evenly inserts in around the steel crucible mould, and the steel crucible mould is pressed in burner hearth center and fixing, and is loosening when preventing to tie a knot; Put into the quartzy sand pocket of constant weight the steel crucible planted agent, push down the steel crucible mould, prevent that the steel crucible mould is up lifted in the furnace lining knotting process; After the steel crucible mould is fixing, can carry out the furnace lining knotting, furnace lining should in layer fill and beat real; Every layer thickness is no more than 50mm, and beats reality again after will spreading out and putting on evenly earlier, after the furnace lining knotting is accomplished; Slowly sling the steel crucible mould with driving, check furnace lining inwall knotting quality then comprehensively, can not replenish and fasten in the consolidation place as finding to have the part; When slinging the steel crucible mould, raising speed is unsuitable too fast, and should accomplish that the limit knocks steel crucible inwall limit and slowly promote; Prevent to draw the bad furnace lining of newly building, take out after the steel crucible mould, cut exceeding furnace lining asbestos cloth suitable for reading; Plane on the furnace lining is tied and fixed fire door, and plane and tapping hole available water glass mix with furnace lining material as binding agent on furnace lining; Brush one deck waterglass before filling earlier, beat reality to filler then;
⑺Baker and sintering: the wet method brickwork only toasts with firewood after accomplishing, and the firewood that is used for baker is 50-60kg; Divide to add several times in the burner hearth, make it completing combustion furnace lining is toasted, after firewood baking several hours; Can feed and carry out melting; For the factory of discontinuous production, second day again charging carry out melting, feed in raw material again after should earlier the ash wood in the burner hearth being cleaned out before the charging.
The present invention compares with background technology, and the one, the wet method brickwork promptly adds a certain amount of water in furnace lining material, mix the back and use the wet method tamped lining.The steel crucible mould is taken out in furnace lining knotting back, can feed after several hours with the firewood baking and carry out melting.The wet method brickwork is compared with the dry method brickwork, and each brickwork can be practiced thrift a steel crucible mould, practices thrift furnace drying time more than 20 hours, practices thrift about 2000 degree of baker electricity consumption, and realizes that basically the same day brickwork same day can the blow-on melting.The wet method brickwork not only can reduce the brickwork cost greatly, improves the working condition (no dust from flying) of brickwork, and, can improve the output of middle frequency furnace; The 2nd, efficient is high, and the wet method brickwork only toasts with firewood after accomplishing.The firewood that is used for baker is 50-60kg, divides to add several times in the burner hearth, makes it completing combustion furnace lining is toasted.After firewood baking several hours, can feed and carry out melting, for the factory of discontinuous production, second day again charging carry out melting.Just can feed in raw material after should earlier the ash wood in the burner hearth being cleaned out before the charging.Improve through the application, new brickwork lining can be cancelled baker one ring, and directly melting is carried out in charging.Furnace drying time and baker firewood be can practice thrift greatly like this, stove, same day brickwork, blow-on on the same day realized tearing open the same day; The 3rd, reduce segregation, after adding water in the quartz sand material of wet method brickwork and mixing, can not produce the size segregation phenomenon of quartz sand, and furnace lining ties a knot easily in wet method knotting process, improved the bulk density of furnace lining effectively.And during the dry method brickwork, quartz sand particle is easy to generate segregation, and when especially adopting the vibration brickwork, time of vibration control is improper, very easily produces the quartz sand particle segregation; The 4th, can repair, after the furnace lining knotting is accomplished, check furnace lining inwall knotting quality then comprehensively.As finding to have the part can not replenish and fasten in the consolidation place, and this point can't be found also can't remedy during with the dry method brickwork; The 5th, heat insulation and good permeability, the insulating barrier of 3t middle frequency furnace and heat insulation layer generally are made up of glass wool cloth, micarex, asbestos board, asbestos cloth.But, in baker and sintering process, can produce a large amount of steam owing to contain more moisture content in the furnace lining material of wet method brickwork.Discharge smoothly in order to help steam, the insulating barrier of wet method brickwork and heat insulation layer material only adopt two-layer asbestos cloth, and without glass wool cloth, micarex and asbestos board.Asbestos cloth had not only insulated but also is adiabatic, and gas permeability is better again, so only to adopt asbestos cloth during the wet method brickwork be more rational, and effect is also good.Simultaneously, the brickwork cost also can reduce significantly; The 6th, improve the working condition of brickwork, no dust from flying has been realized the making of 3T middle frequency furnace, has improved electrosmelting of intermediate frequency output; Two are to use the life-span long, and furnace life is broken through 200 stove high pointes, can reach 275 stoves; Particularly in the noncontinuity melting; And be mainly used under melting centrifugal roller molten iron (high temperature liquid iron is long at the residing time in furnace) condition, its furnace life reaches so high level, the real initiative that belongs to.
Description of drawings
Fig. 1 is the structural representation of steel crucible mould.
Fig. 2 is the structural representation of steel crucible mould in the background technology.
The specific embodiment
Embodiment 1: with reference to accompanying drawing 1.A kind of 3t middle frequency furnace wet method furnace building process comprises the 3t middle frequency furnace,
⑴The steel crucible mould is shaped as truncate hollow cone;
⑵The laying of insulating barrier and heat insulation layer: adopt two-layer asbestos cloth, asbestos cloth not only insulate but also adiabatic;
⑶Furnace bottom is laid: furnace bottom is spread two-layer asbestos cloth, requires two-layer staggered laying, every layer of smooth no wrinkle;
⑷Lay the furnace wall: spread two-layer asbestos cloth near the induction coil inwall, during laying, go up earlier the back down; Every layer of smooth no wrinkle; The longitudinal joint overlap joint clings with waterglass, and the adjacent two layers seam staggers, and the asbestos cloth water glass bonding that stretches out the plane is on stove refractory brick suitable for reading plane; And fasten with iron block, asbestos cloth moves down when preventing brickwork;
⑸Furnace lining material and preparation thereof: furnace lining material adopts refining quartz sand, the quartz sand chemical composition is required as follows: SiO
2Content should be greater than 98%, alkali metal oxide (k
2O, Na
2O) content should be less than 0.50%, Fe
2O
3Content should be less than 0.75%; Sintering aid adopts boric acid, and to the requirement of its chemical composition: boric acid content is greater than 96%, and sulphates content is less than 0.4%, and oxide content is less than 0.05%, and should sieve through the 70-80 mesh;
⑹Use the manual method tamped lining, furnace hearth material fastens the back and wipes off, ties with butt hammer again, puts into the steel crucible mould again after furnace bottom thickness and horizontal degree measurement are qualified; The steel crucible mould is put into and will be made that wall thickness is even as far as possible on every side, these available three same thickness, and one less than the furnace lining wall thickness; Timber wedge greater than the furnace lining wall thickness evenly inserts in around the steel crucible mould, and the steel crucible mould is pressed in burner hearth center and fixing, and is loosening when preventing to tie a knot; Put into the quartzy sand pocket of constant weight the steel crucible planted agent, push down the steel crucible mould, prevent that the steel crucible mould is up lifted in the furnace lining knotting process; After the steel crucible mould is fixing, can carry out the furnace lining knotting, furnace lining should in layer fill and beat real; Every layer thickness is no more than 50mm, and beats reality again after will spreading out and putting on evenly earlier, after the furnace lining knotting is accomplished; Slowly sling the steel crucible mould with driving, check furnace lining inwall knotting quality then comprehensively, can not replenish and fasten in the consolidation place as finding to have the part; When slinging the steel crucible mould, raising speed is unsuitable too fast, and should accomplish that the limit knocks steel crucible inwall limit and slowly promote; Prevent to draw the bad furnace lining of newly building, take out after the steel crucible mould, cut exceeding furnace lining asbestos cloth suitable for reading; Plane on the furnace lining is tied and fixed fire door, and plane and tapping hole available water glass mix with furnace lining material as binding agent on furnace lining; Brush one deck waterglass before filling earlier, beat reality to filler then;
⑺Baker and sintering: the wet method brickwork only toasts with firewood after accomplishing, and the firewood that is used for baker is 50-60kg; Divide to add several times in the burner hearth, make it completing combustion furnace lining is toasted, after firewood baking several hours; Can feed and carry out melting; For the factory of discontinuous production, second day again charging carry out melting, feed in raw material again after should earlier the ash wood in the burner hearth being cleaned out before the charging.
Moisture Content in the furnace lining material quartz sand: middle frequency furnace acid lining material all is made up of quartz sand.During the dry method brickwork, can use after requiring whole quartz sands must pass through oven dry.The quartz sand that Shanghai steel plant use in the stainless steel cask of packing into, advances the mould drying kiln drying, and after magnetic separation, can use.The dry method brickwork requires the quartz sand must be dry, mainly is the decreasing insulating that makes inductor when preventing the moisture vaporization in the furnace lining, and the stove that alarm is arranged is produced false alarm.
In the material of wet method brickwork, but require to add the moisture of 5-6%, under the wet method state, carry out tamped lining, and its furnace life than dry method brickwork taller go out many.We think that this reason is when adopting the wet method brickwork, and water can be as the lubricant of piling up the quartz sand mixture particle.Because contain a certain amount of moisture in the quartz sand compound, the wet method brickwork fastens than dry method brickwork furnace lining easily, and quartz sand can not produce size segregation in the knotting process.See that from the range estimation situation knotting effect spy of wet method brickwork is good.Research shows that the size segregation of quartz sand can destroy rational grain size proportion, causes the agglutinating property variation of furnace lining material, and intensity and heat impact strength descend, and bulk density reduces.Can think that in view of the above the sintering of wet method brickwork lining is better, intensity is higher, and heat impact strength is better, and simultaneously, the bulk density of furnace lining is bigger, and these all help improving the service life of furnace lining.
During the wet method brickwork melting first stove molten iron, furnace charge will clean rustless, and the material piece should be smaller as far as possible, must put down gently when reinforced, do not break the furnace wall, because the furnace wall of this moment is only when firewood toasts, the intensity of furnace wall and hardness are all lower.
Send electric smelting to use 800kw in preceding 15 minutes; Make the furnace lining programming rate unsuitable too fast; The moisture content that helps in the furnace lining is discharged and quartzy crystal transfer, and power rises to 1400--1500kw and carries out normal smelting subsequently, and the first stove molten iron temperature rises to 1500 ℃ and advances insulation 30 minutes; Make furnace lining carry out sintering, the general 120-130 of the smelting time of first stove minute.
In order to obtain a good glaze inwall, except first stove is used clean rustless fritter furnace charge as far as possible, and should behind cast iron melting, take the bits on molten iron surface off, add the cullet of 0.8kg-1.2kg.
The 3t middle frequency furnace is by designing requirement, and the furnace bottom THICKNESS CONTROL is at 140mm--160mm, and furnace wall thickness is controlled at 60mm--80mm.
The repairing of furnace lining: the middle frequency furnace that noncontinuity is produced, after every use once, all can cause furnace lining and tapping hole to damage for various reasons; Furnace lining epimere particularly because the impact that explosion forms during the more useless roller of melting cracks furnace lining, damages comparatively serious; Therefore; Every use all must be repaired after once, reaches the purpose of extending furnace lining life, should be earlier before repairing will repairing place residual iron clean out; The material mixture ratio of fettling is with the furnace lining material proportioning; Plane and tapping hole use the slightly thin quartz sand of granularity to use waterglass to be binding agent on the fettling, preferably brush one deck black lead powder coating after suitable for reading and last plane of stove and tapping hole are fixed, and this is for preventing that the sticking iron in this position is very effective.It is bigger to repair area, repaiies and still will toast with firewood after finishing.
After quartz sand, boric acid and water add in proportion, puddle evenly, must turn over 5-6 time by the requirement of artificial mulling with manual method; Strive mixing, reach best grain size proportion, the material for preparing is built with woven bag; Place after 1-2 hour usefulness again, summer, temperature was high, for preventing water evaporates; Available wet woven bag covers, and the preparation place should be cleaned totally, should prevent that in mixing the system process steel cuttings and iron filings from sneaking into.
Said oven dry is the firewood baking, and the firewood consumption is 50-60kg, divides 3-6 time and adds in the burner hearth, makes it completing combustion furnace lining is toasted.
Quartzy crystal transfer problem when firewood baker and Fast Sintering: quartzy is stable phase at β-quartz below 573 ℃, and stable existence all is β-quartz under nature or the low temperature.Fast transition was that a-is quartzy when β-quartz was heated to 573 ℃.At the quartzy stable existence of 573-870 ℃ of a-.The a-quartz slowly changes the a-tridymite at 870 ℃ when agglutinant (mineralizer), and with 16% volumetric expansion.The a-tridymite is at 870-1470 ℃ of stable existence.The a-tridymite changes the a-cristobalite at 1470 ℃, and the a-cristobalite begins slow fusion at 1470-1713 ℃ of stable existence when temperature is higher than 1713 ℃.The a-cristobalite does not change the a-tridymite under normal cooling condition.
In the quartz sand that reality is used; Owing to added boric acid; And contain a little impurity in the raw material, the crystal transfer of Sio2 is by carrying out under the condition that mineralizer is arranged, i.e. quartzy (870 ℃) a-tridymites (1470) the a-cristobalite of β-quartz (573 ℃) a-.
Baker and sintering: baker and sintering will reach two purposes: 1. get rid of the moisture in the furnace lining material; 2. accomplish the crystal transfer of quartz sand and do not ftracture, the final sinter layer that forms by the a-cristobalite of obtaining, half sinter layer and the furnace lining of sinter layer three-decker not.Accomplish various tasks in different temperature, at the different programming rate of the interval control of different temperature.
Sintering process is at high temperature to make to occur liquid phase on the contact-making surface of quartz sand material and combine, and forms continuous sintering network, makes the whole quartzy integral body of expecting to be unified into through network.Furnace lining section behind the sintering is divided into sinter layer, half sinter layer, not sinter layer.Sinter layer requirement density is big, intensity is high, face crack is few, all fusings between the sand grains particle, and the sintering network is evenly complete.The thickness of sinter layer accounts for the 37-48% of total wall thickness.Half sinter layer is sinter layer and the transition region between the sinter layer not, and the contact-making surface of part particle begins fusing in this district, and the sintering network is incomplete.The effect of this layer is the stress of buffering sinter layer, stops the crackle that produces in the sinter layer to stretch out.The thickness of half sinter layer accounts for the 28-31% of total wall thickness.Sinter layer is not to have one deck not have the original sand material of sintering fully between half sinter layer and the induction coil.It is adiabatic that this layer sand material plays a part, and when furnace lining during in heating and cooling, also plays a part volumetric expansion and contraction.The thickness of sinter layer does not account for the 27-32% of total wall thickness.
Sintering aid adopts boric acid, and its main effect is the sintering temperature that reduces quartz sand.The chemical formula of boric acid is H
3BO
3, when the boric acid thermal dehydration forms the boron cash, its molecular formula is B
2O
3SiO
2-B
2O
3Be that phasor [4] is as shown in Figure 2, can know SiO by figure
2Fusing point be 1710 ℃, B
2O
3Fusing point be 450 ℃, B
2O
3With SiO
2The eutectic thing that forms has only 372 ℃, in other words B
2O
3During as the sintering aid of quartzy material, at 372 ℃ liquid phase will appear.
What need understand is: though the foregoing description is to the mentality of designing of the present invention detailed text description of contrasting; But these text descriptions; Just the simple text of mentality of designing of the present invention is described; Rather than to the restriction of mentality of designing of the present invention, the combination of any not ultra mentality of designing of the present invention, increase or modification all fall in protection scope of the present invention.
Claims (9)
1. a 3t middle frequency furnace wet method furnace building process comprises the 3t middle frequency furnace, it is characterized in that:
⑴The steel crucible mould is shaped as truncate hollow cone;
⑵The laying of insulating barrier and heat insulation layer: adopt two-layer asbestos cloth, asbestos cloth not only insulate but also adiabatic;
⑶Furnace bottom is laid: furnace bottom is spread two-layer asbestos cloth, requires two-layer staggered laying, every layer of smooth no wrinkle;
⑷Lay the furnace wall: spread two-layer asbestos cloth near the induction coil inwall, during laying, go up earlier the back down; Every layer of smooth no wrinkle; The longitudinal joint overlap joint clings with waterglass, and the adjacent two layers seam staggers, and the asbestos cloth water glass bonding that stretches out the plane is on stove refractory brick suitable for reading plane; And fasten with iron block, asbestos cloth moves down when preventing brickwork;
⑸Furnace lining material and preparation thereof: furnace lining material adopts refining quartz sand, the quartz sand chemical composition is required as follows: SiO
2Content should be greater than 98%, alkali metal oxide (k
2O, Na
2O) content should be less than 0.50%, Fe
2O
3Content should be less than 0.75%; Sintering aid adopts boric acid, and to the requirement of its chemical composition: boric acid content is greater than 96%, and sulphates content is less than 0.4%, and oxide content is less than 0.05%, and should sieve through the 70-80 mesh;
⑹Use the manual method tamped lining, furnace hearth material fastens the back and wipes off, ties with butt hammer again, puts into the steel crucible mould again after furnace bottom thickness and horizontal degree measurement are qualified; The steel crucible mould is put into and will be made that wall thickness is even as far as possible on every side, these available three same thickness, and one less than the furnace lining wall thickness; Timber wedge greater than the furnace lining wall thickness evenly inserts in around the steel crucible mould, and the steel crucible mould is pressed in burner hearth center and fixing, and is loosening when preventing to tie a knot; Put into the quartzy sand pocket of constant weight the steel crucible planted agent, push down the steel crucible mould, prevent that the steel crucible mould is up lifted in the furnace lining knotting process; After the steel crucible mould is fixing, can carry out the furnace lining knotting, furnace lining should in layer fill and beat real; Every layer thickness is no more than 50mm, and beats reality again after will spreading out and putting on evenly earlier, after the furnace lining knotting is accomplished; Slowly sling the steel crucible mould with driving, check furnace lining inwall knotting quality then comprehensively, can not replenish and fasten in the consolidation place as finding to have the part; When slinging the steel crucible mould, raising speed is unsuitable too fast, and should accomplish that the limit knocks steel crucible inwall limit and slowly promote; Prevent to draw the bad furnace lining of newly building, take out after the steel crucible mould, cut exceeding furnace lining asbestos cloth suitable for reading; Plane on the furnace lining is tied and fixed fire door, and plane and tapping hole available water glass mix with furnace lining material as binding agent on furnace lining; Brush one deck waterglass before filling earlier, beat reality to filler then;
⑺Baker and sintering: the wet method brickwork only toasts with firewood after accomplishing, and the firewood that is used for baker is 50-60kg; Divide to add several times in the burner hearth, make it completing combustion furnace lining is toasted, after firewood baking several hours; Can feed and carry out melting; For the factory of discontinuous production, second day again charging carry out melting, feed in raw material again after should earlier the ash wood in the burner hearth being cleaned out before the charging.
2. 3t middle frequency furnace wet method furnace building process according to claim 1; It is characterized in that: during the wet method brickwork melting first stove molten iron, furnace charge will clean rustless, and the material piece should be smaller as far as possible; Must put down gently when reinforced; Do not break the furnace wall, because the furnace wall of this moment is only when firewood toasts, the intensity of furnace wall and hardness are all lower.
3. 3t middle frequency furnace wet method furnace building process according to claim 1 and 2; It is characterized in that: send electric smelting to use 800kw in preceding 15 minutes, make the furnace lining programming rate unsuitable too fast, the moisture content that helps in the furnace lining is discharged and quartzy crystal transfer; Power rises to 1400--1500kw and carries out normal smelting subsequently; The first stove molten iron temperature rises to 1500 ℃ and advances insulation 30 minutes, makes furnace lining carry out sintering, the general 120-130 of the smelting time of first stove minute.
4. 3t middle frequency furnace wet method furnace building process according to claim 1 and 2; It is characterized in that: in order to obtain a good glaze inwall; Except first stove is used clean rustless fritter furnace charge as far as possible; And should behind cast iron melting, take the bits on molten iron surface off, add the cullet of 0.8kg-1.2kg.
5. 3t middle frequency furnace wet method furnace building process according to claim 1 is characterized in that: the 3t middle frequency furnace is by designing requirement, and the furnace bottom THICKNESS CONTROL is at 140mm--160mm, and furnace wall thickness is controlled at 60mm--80mm.
6. 3t middle frequency furnace wet method furnace building process according to claim 1 is characterized in that: the repairing of furnace lining: the middle frequency furnace that noncontinuity is produced, after every use once; All can cause furnace lining and tapping hole damage, particularly furnace lining epimere for various reasons, the impact that explosion forms when giving up roller more greatly owing to melting cracks furnace lining; Damage comparatively seriously, therefore, every use all must be repaired after once; Reach the purpose of extending furnace lining life; Should be earlier before repairing will repairing place residual iron clean out, the material mixture ratio of fettling is with the furnace lining material proportioning, the slightly thin quartz sand of plane and tapping hole use granularity uses waterglass to be binding agent on the fettling; After fixing, suitable for reading and last plane of stove and tapping hole preferably brush one deck black lead powder coating; This is for preventing that the sticking iron in this position is very effective, and it is bigger to repair area, repaiies and still will toast with firewood after finishing.
7. 3t middle frequency furnace wet method furnace building process according to claim 1 is characterized in that: after quartz sand, boric acid and water add in proportion, puddle evenly with manual method; Must turn over 5-6 time by the requirement of artificial mulling, strive mixing, reach best grain size proportion; The material for preparing is built with woven bag, places after 1-2 hour usefulness again, and summer, temperature was high; For preventing water evaporates; Available wet woven bag covers, and the preparation place should be cleaned totally, should prevent that in mixing the system process steel cuttings and iron filings from sneaking into.
8. 3t middle frequency furnace wet method furnace building process according to claim 2 is characterized in that: said oven dry is the firewood baking, and the firewood consumption is 50-60kg, divides 3-6 time and adds in the burner hearth, makes it completing combustion furnace lining is toasted.
9. 3t middle frequency furnace wet method furnace building process according to claim 1 is characterized in that: the moisture that but requires to add 5-6% in the material of wet method brickwork.
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| CN102954694A (en) * | 2012-11-15 | 2013-03-06 | 全椒君鸿软磁材料有限公司 | Bottom dropping method of three-ton smelting furnace |
| CN103411435A (en) * | 2013-07-24 | 2013-11-27 | 济南济钢铁合金厂 | Method for repairing furnace lining of intermediate frequency furnace used in steelmaking |
| CN103486859A (en) * | 2013-09-29 | 2014-01-01 | 山西太钢不锈钢股份有限公司 | Method for casting inner chamber lining of induction heating furnace |
| CN103673619A (en) * | 2013-11-27 | 2014-03-26 | 福州文泰机械铸造有限公司 | Method for building high-age medium-frequency induction furnace through quartz sand and use method |
| CN103693983A (en) * | 2013-12-24 | 2014-04-02 | 湖南航天磁电有限责任公司 | Neutral lining of medium-frequency induction furnace for smelting of sintered neodymium-iron-boron permanent-magnet material |
| CN104001564A (en) * | 2013-08-13 | 2014-08-27 | 中磁科技股份有限公司 | Wet type and semi-automatic method for forging crucible |
| CN104596290A (en) * | 2013-10-30 | 2015-05-06 | 林州市林丰铝电有限责任公司 | Method for prolonging furnace life of intermediate frequency furnace |
| CN106052400A (en) * | 2016-05-31 | 2016-10-26 | 河北钢铁股份有限公司承德分公司 | Ramming method for vanadium and aluminum smelting furnace bodies |
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| CN110759722A (en) * | 2019-10-29 | 2020-02-07 | 芜湖福记恒机械有限公司 | Manufacturing process of intermediate frequency furnace lining |
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| CN102954694B (en) * | 2012-11-15 | 2014-07-30 | 全椒君鸿软磁材料有限公司 | Bottom dropping method of three-ton smelting furnace |
| CN103411435A (en) * | 2013-07-24 | 2013-11-27 | 济南济钢铁合金厂 | Method for repairing furnace lining of intermediate frequency furnace used in steelmaking |
| CN103411435B (en) * | 2013-07-24 | 2015-04-22 | 济南济钢铁合金厂 | Method for repairing furnace lining of intermediate frequency furnace used in steelmaking |
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| CN106052400B (en) * | 2016-05-31 | 2019-01-29 | 河北钢铁股份有限公司承德分公司 | Smelt the knotting method of vanadium aluminium furnace body |
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| CN109520305B (en) * | 2018-12-31 | 2024-04-12 | 广西玉柴机器股份有限公司 | Construction equipment and operation method for kiln nozzle of industrial smelting furnace |
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| CN112964062A (en) * | 2021-04-02 | 2021-06-15 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of crucible for vacuum induction melting furnace |
| CN112964062B (en) * | 2021-04-02 | 2022-10-21 | 江苏省沙钢钢铁研究院有限公司 | Preparation method of crucible for vacuum induction melting furnace |
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