CN103740887B - Leak-proof steel structure and leak-proof steel process of steelmaking converter bottom - Google Patents
Leak-proof steel structure and leak-proof steel process of steelmaking converter bottom Download PDFInfo
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- CN103740887B CN103740887B CN201410036023.8A CN201410036023A CN103740887B CN 103740887 B CN103740887 B CN 103740887B CN 201410036023 A CN201410036023 A CN 201410036023A CN 103740887 B CN103740887 B CN 103740887B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000009628 steelmaking Methods 0.000 title claims abstract description 31
- 239000011449 brick Substances 0.000 claims abstract description 168
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 87
- 239000000571 coke Substances 0.000 claims abstract description 44
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 44
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 43
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims abstract description 40
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 35
- 239000010431 corundum Substances 0.000 claims abstract description 35
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 32
- RWDBMHZWXLUGIB-UHFFFAOYSA-N [C].[Mg] Chemical compound [C].[Mg] RWDBMHZWXLUGIB-UHFFFAOYSA-N 0.000 claims abstract description 23
- 239000002893 slag Substances 0.000 claims abstract description 17
- 229910052742 iron Inorganic materials 0.000 claims abstract description 16
- 238000010276 construction Methods 0.000 claims description 36
- 239000004575 stone Substances 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 14
- 230000008018 melting Effects 0.000 claims description 14
- 229910052749 magnesium Inorganic materials 0.000 claims description 10
- 239000011777 magnesium Substances 0.000 claims description 10
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 239000004567 concrete Substances 0.000 claims description 5
- 230000008595 infiltration Effects 0.000 claims description 5
- 238000001764 infiltration Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 241001125877 Gobio gobio Species 0.000 claims 1
- 241001062472 Stokellia anisodon Species 0.000 abstract 1
- 229910052804 chromium Inorganic materials 0.000 abstract 1
- 239000011651 chromium Substances 0.000 abstract 1
- 230000035515 penetration Effects 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 229910052760 oxygen Inorganic materials 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 208000037805 labour Diseases 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 241001125879 Gobio Species 0.000 description 3
- 238000003475 lamination Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011819 refractory material Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 208000004141 microcephaly Diseases 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000009865 steel metallurgy Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention provides a leak-proof steel structure and a leak-proof steel process of a steelmaking converter bottom. The leak-proof steel process of the steelmaking converter bottom comprises the following steps that chromium corundum ramming mixes are poured at joint inner walls of a converter bottom working layer and a blank pressing part working layer after a converter molten pool is built, and a circular ring beam structure is formed and natural curing is carried out for 48 hours; a coke furnace is hung, then slag materials of cokes which are burnt are attached on the inner surface of a magnesium carbon brick working layer to form a coke slag material layer, and molten iron permeates the coke slag material layer to enter into the circular ring beam structure when a converter starts to smelt first furnace steels, so that the coke slag material layer and the circular ring beam structure are firmly combined with the magnesium carbon brick working layer of the converter to form a whole body to fully seal connecting parts of the converter bottom working layer and a converter body working layer. According to the invention, the circular ring beam structure, a slag material layer and a furnace lining magnesia carbon brick are combined into a whole through the molten steel, thereby sealing steel-leaking channels of blank pressing parts completely to avoid molten steel penetration, steel clamping phenomena and steel leakage accidents.
Description
Technical field
The present invention relates to field of steel metallurgy, specifically a kind of steel-leakage preventing structure of steel-making converter furnace bottom and the technique for the process of furnace bottom steel-leakage preventing.
Background technology
The furnace lining structure of top end compound oxygen blowing converter is made up of refractory materials, is divided into permanent layer and working lining.Wherein: permanent layer lining brick multiselect burned-magnesia brick, has good physical and chemical performance and shock resistance erosional competency, and possess good heat-blocking action.Working lining lining brick multiselect magnesia carbon brick, can bear the big ups and downs of high temperature and temperature, possesses the chemical erosion of good resistance to slag and can resist mechanical shock and the polishing machine of molten steel.
But, due to design defect and the restriction being subject to production operation technique of the furnace lining structure of the converter of the different type of furnace, in the process that reality uses, all there is more problem, cause time serious stopping production, cause larger loss.The phenomenon that flanging position, furnace bottom molten bath exists folder steel is more common problem, can lead to bleed-out accident time serious.Its major cause is that flanging position, molten bath district bears the strong erosion of molten steel in smelting process, in the Converter labour middle and later periods, flanging tile stove lining is progressively thinning, the magnesia carbon brick damage of furnace bottom and molten pool working layer is comparatively serious, concentrate on flanging brick top, molten bath 1-2 layer operational layer brick especially, move back platform region to be easy to just be washed away by steel scrap and molten steel in the blow-on stage, do not have the mechanics stabilization well pushing down furnace bottom operational layer brick, cause in grate process, furnace bottom working lining loosens, generation gap, flanging position, very easily occur that molten steel penetrates, the phenomenon of folder steel and generation bleed-out accident.
Summary of the invention
The present invention provides a kind of steel-leakage preventing structure of steel-making converter furnace bottom and the technique for the process of furnace bottom steel-leakage preventing according to the deficiencies in the prior art; the present invention just serves the effect of extremely strong protection furnace lining from the blow-on stage; especially the refractory brick for Tui Tai extension, flanging brick top, molten bath serves huge provide protection; make whole furnace bottom all very firm in the whole stove labour stage, stop phenomenon and bleed-out accident that molten steel penetrated, pressed from both sides steel.
Technical scheme provided by the invention: the steel-leakage preventing structure of described a kind of steel-making converter furnace bottom comprises steel-making converter shell and the magnesium brick permanent layer that sets gradually from outside to inside in steel-making converter shell and magnesia carbon brick make layer, described magnesia carbon brick working lining comprises body of heater working lining, furnace bottom flanging position working lining and furnace bottom working lining, it is characterized in that: inside magnesia carbon brick working lining, form an annular collar girder construction at body of heater working lining and furnace bottom working lining connecting portion by building chrome corundum ramming mass (buying the CGD-90 of the metallurgical Science and Technology Ltd. of Wuhan Ke Shengyuan), the connecting portion of body of heater working lining and furnace bottom working lining covers by annular ring girder construction completely, the breeze bed of material is had in the surface coverage of annular collar girder construction, the breeze bed of material and annular collar girder construction are connected as one by the magnesia carbon brick working lining of molten steel and steel melting furnace, to be that the breeze stockpile when steel-making converter adopts coke blow-on after coke burning is long-pending form the described breeze bed of material, coke blow-on is steel-making tile stove a kind of common blow-on mode, exactly after steel-making converter lays, is hung in by coke in body of heater, to be burnt a kind of technique of toasting refractory materials in body of heater by coke.
Conventional coke blow-in method is: before baker adds coke, must bottom blowing nitrogen is logical on, nitrogen flow control 120Nm3/h(wherein every block gas permeable brick air flow be 15Nm3/h); In stove, add red coke 6t with steel scrap bucket, grate makes it be uniformly distributed in furnace bottom, lower rifle oxygen supply, starts the little fiery temperature raising of requirement, makes temperature of furnace lining slowly increase.Oxygen rifle height (shower nozzle is apart from furnace bottom) is 2.0 ~ 3.0m, and oxygen pressure-controlled is at 0.1 ~ 0.3MPa.Baker process primary air fan low-speed running.Observe fire door flame conditions in baker process, baking about 60min starts to add coke 500kg, adds coke 500kg every 30 minutes later.Require that baking time is not less than 120min, baking coke consumption 7-8t.
Coke dosage in baker process: process coke started to add after 40 minutes, adds carbon 500kg, is divided into 4 times, process coke add-on 2-4t for every 30 minutes.The control of oxygen flow: in first 15 minutes, oxygen flow controls at 4800Nm3/h; 15-75 minute; Oxygen flow controls at 5500Nm3/h; After 75 minutes, oxygen flow controls at 7500Nm3/h.Baker is assumed unified command of by furnace superintendent, and rifle position, oxygen flow are performed by master control work.Baker rifle position remains on 1.8-2.2m, often adds a collection of coke and suitably reduces rifle position 200-300mm, recover former rifle position after 2 minutes.
The further technical scheme of the present invention: described furnace bottom working lining to be built by laying bricks or stones according to cross-shaped symmetrical from hearth center by magnesia carbon brick to form, and on furnace bottom working lining, form the axis of pitch cruciform axis corresponding with the gudgeon line of converter, and furnace bottom working lining is divided into four right angle arc areas by cruciform axis; Described furnace bottom flanging position working lining is looped around furnace bottom working lining outer rim, in the working lining of furnace bottom flanging position, four endpoint locations of corresponding furnace bottom working lining cruciform axis are laid with master lock brick district respectively, in the working lining of furnace bottom flanging position, the position of corresponding furnace bottom working lining four rectangular area is at least provided with an auxiliary neck brick district, and the angle between Mei Liangge neck brick district is equal to or less than 45 °.Optimal technical solution is that described auxiliary neck brick district also has four, be laid in furnace bottom position working lining four right angle arc areas respectively with on the hearth center point bisector that is starting point, four auxiliary neck brick districts and four master lock brick districts are alternately distributed, if with the medullary ray in trunnion of converter direction for benchmark, the direction of its tap hole is 0 °, the two-end-point of its this medullary ray is respectively 0 °, 180 °, then four master lock brick districts are distributed in furnace bottom 0 °, 90 °, the position of 180 ° and 270 °, four auxiliary neck brick district distributions are furnace bottom 45 °, 135 °, the position of 225 ° and 315 °, the angle formed between every two adjacent neck brick districts and hearth center line is 45 °.
The present invention is technical scheme preferably: the height of annular ring girder construction is 100-200mm, and thickness is 100-150mm.
The present invention is technical scheme preferably: the appearance length of Tui Tai extension, working lining top, flanging position, described molten bath is all less than 70mm.
The present invention is technical scheme preferably: described master lock brick district and auxiliary neck brick district all adopt wherein side to be inclined-plane, opposite side is that the magnesium carbon neck brick of vertical surface is built by laying bricks or stones and formed, and the scarp of every block magnesium carbon neck brick contacts with the magnesia carbon brick intimate of furnace bottom working lining outmost turns, the magnesium brick permanent layer of the other end and corresponding position clamps.Described master lock brick district and auxiliary neck brick district all have multilayer magnesium carbon neck brick to put down block to form, general with five layers for preferred plan, specifically determine according to the thickness of magnesia carbon brick, and all master lock brick districts are consistent with other region height of flanging position working lining with the height in auxiliary neck brick district, and highest face temperature is consistent with the outer rim height that furnace bottom position working lining processes levelling rear upper surface; Every layer all has at least five pieces of magnesium carbon neck brick levels to build by laying bricks or stones to form.
Another kind of technical scheme provided by the invention: the leakproof treatment process of described a kind of steel-making converter furnace bottom, is characterized in that concrete steps are as follows:
(1) after converter molten pool is built by laying bricks or stones, chrome corundum ramming mass is built in the junction of furnace bottom working lining and flanging position working lining, chrome corundum ramming mass is made to enter in the whole circle gap of furnace bottom working lining and working lining junction, flanging position, and the collar tie beam structure of an annular is formed on the surface of furnace bottom working lining and working lining junction, flanging position, and natural curing 36-48 hours, being exactly place 36-48 hour in its natural state, is also the normal step that existing converter is built by laying bricks or stones;
(2) treat after natural curing, during converter blow-on, hang in coke baking, the slag charge after coke burning just can be attached to the internal surface of magnesia carbon brick working lining, simultaneously by being built the annular collar girder construction covering of formation in step (1) by chrome corundum ramming mass, form the breeze bed of material on its surface;
(3) after furnace bath terminates under coke baking, namely the intensity of the collar tie beam structure of chrome corundum ramming mass formation reaches 40%-60%, terminate coke baking, converter starts melting one heat steel, at the initial stage of converter melting one heat steel, the molten iron infiltration breeze bed of material enters in annular collar girder construction, and bring coke slag charge when entering into and pour in annular collar girder construction together, stoped by annular collar girder construction and solidify, now molten iron, coke slag charge, chrome corundum ramming mass mixes, and in steelmaking process under molten iron high temperature action, the breeze bed of material, the magnesia carbon brick jail working lining of chrome corundum ramming mass annular collar girder construction layer and converter is combined into an entirety securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, passage by bleed-out is all shut.
The filler used in converter molten pool building process is chrome corundum mould material.Described chrome corundum mould material and chrome corundum ramming mass physical and chemical index all as follows:
The present invention builds formation annular collar boom support at the furnace bottom working lining of steel-making converter and body of heater working lining junction by chrome corundum ramming mass, furnace bottom working lining and body of heater working lining connecting portion cover by this annular collar boom support completely, and in body of heater maintenance and burning carbon process, be combined with carbon residue, and by make steel the infiltration of molten steel bonding after with body of heater working lining and furnace bottom working lining in conjunction with as a whole, thus the effect that the passage of bleed-out is all shut by realization, make whole furnace bottom all very firm in the whole stove labour stage, stop molten steel to penetrate, the phenomenon of folder steel and bleed-out accident.
Structure of the present invention is simple, enforcement is convenient, utilize the intensity of chrome corundum ramming mass self, after adding coke blow-on, residual slag charge and molten iron mix, the molten iron infiltration breeze bed of material enters in annular collar girder construction, make the breeze bed of material, the magnesia carbon brick jail working lining of annular collar girder construction layer and converter is combined into an entirety securely, thus realize the object furnace bottom working lining and body of heater working lining connecting portion shut completely.
After the invention process, effect is better, and slag material layer and furnace lining magnesia carbon brick are combined into an entirety securely, thus the effect that the passage of flanging position bleed-out is all shut by realization, and the phase does not occur that molten steel penetrates again, presss from both sides the phenomenon of steel and bleed-out accident after manufacture in converter.
Accompanying drawing explanation
Fig. 1 is the sectional view that the present invention is not provided with neck brick position;
Fig. 2 is the sectional view being provided with neck brick face of the present invention;
Fig. 3 is the close-up schematic view of A in Fig. 1;
Fig. 4 is vertical view of the present invention;
Fig. 5 is the structural representation that neck brick is built by laying bricks or stones.
In figure: 1-shell, 2-magnesium brick permanent layer, 3-body of heater working lining, 4-furnace bottom flanging position working lining, 5-furnace bottom working lining, 6-annular collar girder construction, 7-breeze bed of material, 8-master lock brick district, 9-auxiliary neck brick district, 10-neck brick, 11-gas permeable brick.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated.
In Fig. 1, the steel-leakage preventing structure of described a kind of steel-making converter furnace bottom, the magnesium brick permanent layer 2 comprising steel melting furnace shell 1 and set gradually from outside to inside in steel melting furnace shell and magnesia carbon brick make layer, described magnesia carbon brick working lining comprises body of heater working lining 3, furnace bottom flanging position working lining 4 and furnace bottom working lining 5, it is characterized in that: (buy the CGD-90 of the metallurgical Science and Technology Ltd. of Wuhan Ke Shengyuan at body of heater working lining 3 and furnace bottom working lining 5 connecting portion by building chrome corundum ramming mass, also other chrome corundum ramming mass can be adopted) inside magnesia carbon brick working lining, form an annular collar girder construction 6, the connecting portion of body of heater working lining 3 with furnace bottom working lining 5 covers by annular ring girder construction 6 completely, lead on the surface of annular collar girder construction 6 and be coated with the breeze bed of material 7, to be that the breeze stockpile when steel-making converter adopts coke blow-on after coke burning is long-pending form the described breeze bed of material 7, just the breeze bed of material 7 can be formed on annular collar girder construction 6 surface by normal coke process of the start-up, whole process is simple and convenient, the breeze bed of material 7 and annular collar girder construction 6 are after blow-on during melting one heat steel, and the magnesia carbon brick working lining of the breeze bed of material 7, annular collar girder construction and steel melting furnace just can connect as one by molten steel.
As shown in Figure 4, described furnace bottom working lining 5 to be built by laying bricks or stones according to cross-shaped symmetrical from hearth center by magnesia carbon brick to form, and on furnace bottom working lining 5, form the axis of pitch cruciform axis corresponding with the gudgeon line of converter, and furnace bottom working lining 5 is divided into four right angle arc areas by cruciform axis, for 250 tons of converters, concrete building method: furnace bottom working lining 5 adopts the magnesia carbon brick of model MTD-16.315# and 317# to coordinate and builds by laying bricks or stones, after furnace bottom permanent layer finishes building with center, converter two gudgeon direction for benchmark, it is projected as 90 ° of-270 ° of medullary rays of furnace bottom working lining, first row magnesia carbon brick is built by laying bricks or stones centered by this line, centered by this row, respectively build two row's magnesia carbon bricks to both sides again, build five row's magnesia carbon bricks altogether by laying bricks or stones, again with the medullary ray in direction, large face, front and back for benchmark, it is projected as 0 ° of-180 ° of medullary ray of furnace bottom working lining, first row magnesia carbon brick is built by laying bricks or stones centered by this line, two row's magnesia carbon bricks are respectively built to both sides again centered by this row, five row's magnesia carbon bricks are built altogether by laying bricks or stones, the magnesia carbon brick that five rows built by laying bricks or stones with furnace bottom 90 ° of-270 ° of medullary rays are parallel with trunnion of converter line, with the magnesia carbon brick that five rows built by laying bricks or stones with furnace bottom 0 ° of-180 ° of medullary ray are vertical with trunnion of converter line, form an orthogonal cross axis, and furnace bottom position is divided equally into four right angle arc areas by stove, then with four right angle arc areas of position working lining 3 bottom cross axisymmetrical masonry heater, each right angle arc area alternately to be built by laying bricks or stones from hearth center to its square edge according to herring-bone and is formed, brickwork joint≤2mm, bottom three angle seam chrome corundum mould material are tamped.Described furnace bottom flanging position working lining 4 is looped around furnace bottom working lining 5 outer rim, in furnace bottom flanging position working lining 4, four endpoint locations of corresponding furnace bottom working lining 5 cruciform axis are laid with master lock brick district 8 respectively, in furnace bottom flanging position working lining 4, the position of corresponding furnace bottom working lining 5 four rectangular area is at least provided with an auxiliary neck brick district 9, and the angle between Mei Liangge neck brick district is equal to or less than 45 °.For the 250 tons of converters of Wuhan Iron and Steel Plant steel-making head factory three subsidiary factory, the building method that edge position working lining 4 is concrete: flanging position working lining 4 build totally five layers by laying bricks or stones, five row's brick ending regions of wire cross are drawn at furnace bottom, furnace wall brick and bottom brick hold out against and do not establish filler (therefore, the microcephaly of 5 layers of furnace wall brick in this region must be processed into inclined-plane to closely cooperate with bottom brick, brickwork joint≤2mm, is master lock Zhuan Qu position).First first ring flanging brick is built by laying bricks or stones, brick number is MTD303, 304 long 450mm two kinds brick coordinate builds by laying bricks or stones, as shown in Figure 2 and Figure 4, five lamination limit bricks are building 0 ° by laying bricks or stones, 90 °, 180 °, 270 ° four places of master lock brick district 8, magnesium carbon neck brick 10 is processed as respectively with five block length bricks, as shown in Figure 5, described magnesium carbon neck brick 10 side is inclined-plane, opposite side is vertical surface, and the outside surface angle of inclination setting of magnesia carbon brick is enclosed according to furnace bottom position working lining 5 outermost one of building by laying bricks or stones in the angle of inclination on inclined-plane, require that magnesium carbon neck brick processing length is accurate, make two inclined-planes can close contact, furnace bottom position working lining 5 is compressed, the vertical surface lower rim of magnesium carbon neck brick 10 near one end of magnesium brick permanent layer holds out against magnesium brick permanent layer 2, as shown in Figure 4, separately at four places of auxiliary neck brick district 9 at 45 °, 135 °, 225 °, 315 ° places, same employing side is inclined-plane, opposite side is that the magnesium carbon neck brick of vertical surface adopts the method identical with master lock brick district 8 to build by laying bricks or stones, in order to strengthen intensity of hearth, and control the level of flanging brick layer and brick surface well without faulting of slab ends, neck brick region adopts long (layer 5) brick processing of long (the 4th layer) 900mm of long (third layer) 800mm of long (second layer) 750mm of 650mm to compress respectively, flanging position working lining 4 is except four master lock brick districts 5 and four auxiliary neck brick districts 6, the non-neck brick district at other position adopts MTD305 respectively, 306(second ring) MTD307, 308(the 3rd ring) MTD309, 310(Fourth Ring) MTD313, 314(five rings) regulate and build by laying bricks or stones, there are five layers equally, as shown in Figure 1, the both ends of the surface of every lamination limit brick are vertical surface, in building process, the vertical surface lower rim at two ends respectively with magnesium brick permanent layer 2, furnace bottom position working lining 5 holds out against, after flanging brick the first to five layer requires that horizontal 1mm/1m brickwork joint < 2mm layer 5 finishes building, it is levelling that processing played by part pneumatic pick furnace bottom working lining being exceeded five lamination limit brick levels, close door to select in 45 ° or 315 ° of regions, adopt and first hold out against brickwork joint gage, door is closed again according to the processing of physical size clip, closing tweel block must > 1/2 full sized brick width.Three angle seams between the flanging brick in three angle seams between the magnesium carbon neck brick in neck brick district and magnesium brick permanent layer and non-neck brick district and furnace bottom operational layer brick adopt the mode of filler to build by laying bricks or stones, wherein: first and second, five layers with the tamping of chrome corundum mould material, the alcohol resin magnesium carbon ramming mass tamping of third and fourth layer.Described chrome corundum mould material adopts identical with the material of the chrome corundum ramming mass used in annular collar girder construction 6 in the present invention, described alcohol resin magnesium carbon ramming mass be by concentration be 99% anhydrous industrial alcohol and resin-bonded magnesium carbon ramming mass to be mixed with according to weight ratio 100:7-10 and to form, wherein resin-bonded magnesium carbon ramming mass is the finished product bought, its to buy in finished product by resin-bonded in magnesium carbon ramming mass, the main component of magnesium carbon ramming mass is MgO >=90% and C >=2%, all the other are impurity, and resin adopts 872-A type resin.The physical and chemical index of described alcohol resin magnesium carbon ramming mass:
As shown in Figure 3, the height of annular ring girder construction 6 is 100-200mm, and thickness is 100-150mm.The gap of furnace bottom position working lining 5 and body of heater position working lining 3 connecting portion highly can cover by completely.
The appearance length of Tui Tai extension, working lining 4 top, flanging position, described molten bath is all less than 70mm.Guarantee that working lining surface is moved back platform and seamlessly transitted, avoid moving back that platform is excessive subjects to steel scrap, molten iron, the washing away of molten steel, reduce effect of the present invention.
Embodiment, for the 250 tons of converters of Wuhan Iron and Steel Plant steel-making head factory three subsidiary factory, in converter building process, cancellation magnesia fills the technique of nature three angle seams between working lining magnesia carbon brick and permanent layer, and selects and tamp with material chrome corundum mould material (slide plate mouth of a river joint cement material is identical) with chrome corundum ramming mass, requires fully to stir, expect that grain soaks, with with stirring, avoid in grate process, magnesia flows to, and the phenomenon in cavity appears in the other side; The appearance length of Tui Tai extension, top, flanging position, molten bath is controlled in building process, requirement controls within 70mm, specific practice is: the permanent layer on the 7th layer of working lining is built ring and built 4 layers of M305, M306 from adding and become and add block 2 layers of M305, M306 brick, respectively build a ring with M-1 and M-5, realization moves back the appearance length of platform extension within 70mm.
The technique of this steel-making converter furnace bottom steel-leakage preventing process, concrete steps are as follows:
(1) after converter molten pool is built by laying bricks or stones, the chrome corundum ramming mass of the CGD-90 that model that Ke Shengyuan metallurgical Science and Technology Ltd. in Wuhan produces is is built at the junction inwall of furnace bottom working lining and flanging position working lining, chrome corundum ramming mass is made to enter in the whole circle gap of furnace bottom working lining and working lining junction, flanging position, and form the collar tie beam structure that a thickness is the annular of 100-150mm on the surface of furnace bottom working lining and working lining junction, flanging position, and natural curing 36-48 hours;
(2) treat after natural curing, during converter blow-on, hang in coke baking, the slag charge after coke burning just can be attached to the internal surface of magnesia carbon brick working lining, simultaneously by being built the annular collar girder construction covering of formation in step (1) by chrome corundum ramming mass, form the breeze bed of material on its surface;
(3) after furnace bath terminates under coke baking, namely the intensity of the collar tie beam structure of chrome corundum ramming mass formation reaches 40%-60%, terminate coke baking, converter starts melting one heat steel, at the initial stage of converter melting one heat steel, the molten iron infiltration breeze bed of material enters in annular collar girder construction, and bring coke slag charge when entering into and pour in annular collar girder construction together, stoped by annular collar girder construction and solidify, now molten iron, coke slag charge, chrome corundum ramming mass mixes, and in steelmaking process under molten iron high temperature action, the breeze bed of material, the magnesia carbon brick jail working lining of chrome corundum ramming mass annular collar girder construction layer and converter is combined into an entirety securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, passage by bleed-out is all shut.
Steel-making converter in embodiment is very well when when all previous Converter Maintenance, furnace bottom is removed, just can remove complete in general 4 hours, achieve and use effect significantly, through measuring and calculating, have employed furnace bottom steel-leakage preventing treatment process of the present invention can make converter lining life improve more than 3000 heats, substantially increases converter lining life; Calculate according to economic campaign life 9000 furnace gauge of converter, adopt technique of the present invention can extend life of converter 1/3, reach more than 12000 heats, there is significant economic benefit.
When not using steel-leakage preventing technique of the present invention, calculate according to 250 tons of converters, 750 tons of refractory materialss, single seat converter overhaul once needs generation expense: the 1. main material expense of refractory materials: ten thousand yuan, market price 4500 yuan/ton × 750 tons=337.5; 2. overhaul building construction expense: 300,000 yuan; 3. overhaul priming cost=337.5+30=367.5 ten thousand yuan is amounted to.
After using the present invention, the overhaul of stove labour can extend to 1.33 by 1 year, deducted the single converter application priming cost 20,000 yuan of this technology, and single seat converter can directly year reduces cost of overhaul 367.5-367.5/1.33-2/1.33=90 ten thousand yuan.By above comparing calculation, can find out the present invention and greatly save converter cost, its benefit is very remarkable, and the high speed being conducive to iron and steel enterprise's cost efficiency develops in a healthy way, and has application value widely.
Claims (7)
1. the steel-leakage preventing structure of a steel-making converter furnace bottom, the magnesium brick permanent layer (2) comprising steel melting furnace shell (1) and set gradually from outside to inside in steel melting furnace shell and magnesia carbon brick working lining, described magnesia carbon brick working lining comprises body of heater working lining (3), furnace bottom flanging position working lining (4) and furnace bottom working lining (5), it is characterized in that: in furnace bottom flanging position working lining (4), be distributed with multiple master lock brick district (8) and auxiliary neck brick district (9), described master lock brick district (8) and auxiliary neck brick district (9) all have multilayer magnesium carbon neck brick to put down block to form, every layer all has at least five pieces of magnesium carbon neck brick levels to build by laying bricks or stones to form, all master lock brick districts are consistent with other region height at furnace bottom flanging position working lining (4) with the height in auxiliary neck brick district, and highest face temperature is consistent with the outer rim height that furnace bottom working lining (5) processes levelling rear upper surface, inside magnesia carbon brick working lining, an annular collar girder construction (6) is formed by building chrome corundum ramming mass at body of heater working lining (3) and furnace bottom working lining (5) connecting portion, the connecting portion of body of heater working lining (3) with furnace bottom working lining (5) covers by annular ring girder construction (6) completely, be covered with the breeze bed of material (7) on the surface of annular collar girder construction (6), the breeze bed of material (7) and annular collar girder construction (6) are connected as one by the magnesia carbon brick working lining of molten steel and steel melting furnace.
2. the steel-leakage preventing structure of a kind of steel-making converter furnace bottom according to claim 1, it is characterized in that: described furnace bottom working lining (5) to be built by laying bricks or stones according to cross-shaped symmetrical from hearth center by magnesia carbon brick to form, and above form the axis of pitch cruciform axis corresponding with the gudgeon line of converter at furnace bottom working lining (5), and furnace bottom working lining (5) is divided into four right angle arc areas by cruciform axis; Described furnace bottom flanging position working lining (4) is looped around furnace bottom working lining (5) outer rim, in furnace bottom flanging position working lining (4), four endpoint locations of corresponding furnace bottom working lining (5) cruciform axis are laid with master lock brick district (8) respectively, in furnace bottom flanging position working lining (4), the position of corresponding furnace bottom working lining (5) four rectangular area is at least provided with an auxiliary neck brick district (9), and the angle between Mei Liangge neck brick district is equal to or less than 45 °.
3. the steel-leakage preventing structure of a kind of steel-making converter furnace bottom according to claim 1 and 2, is characterized in that: the height of annular ring girder construction (6) is 100-200mm, and thickness is 100-150mm.
4. the steel-leakage preventing structure of a kind of steel-making converter furnace bottom according to claim 1 and 2, is characterized in that: to be that the breeze stockpile when steel-making converter adopts coke blow-on after coke burning is long-pending form the described breeze bed of material (7).
5. the steel-leakage preventing structure of a kind of steel-making converter furnace bottom according to claim 2, it is characterized in that: described master lock brick district (8) and auxiliary neck brick district (9) all adopt wherein side to be inclined-plane, opposite side is that the magnesium carbon neck brick (10) of vertical surface is built by laying bricks or stones and formed, and the scarp of every block magnesium carbon neck brick (10) contacts with the magnesia carbon brick intimate of furnace bottom working lining (5) outmost turns, the magnesium brick permanent layer (2) of the other end and corresponding position clamps.
6. a leakproof treatment process for steel-making converter furnace bottom, is characterized in that concrete steps are as follows:
(1) after converter molten pool is built by laying bricks or stones, chrome corundum ramming mass is built at the junction inwall of furnace bottom working lining and flanging position working lining, chrome corundum ramming mass is made to enter in the whole circle gap of furnace bottom working lining and working lining junction, flanging position, and form the collar tie beam structure of an annular on the surface of furnace bottom working lining and working lining junction, flanging position, and natural curing 36-48 hours;
(2) treat after natural curing, during converter blow-on, hang in coke baking, slag charge after coke burning just can be attached to the internal surface of magnesia carbon brick working lining, simultaneously by being built the annular collar girder construction covering of formation in step (1) by chrome corundum ramming mass, form the breeze bed of material on its surface;
(3) after furnace bath terminates under coke baking, namely the intensity of the collar tie beam structure of chrome corundum ramming mass formation can reach 40%-60%, terminate coke baking, converter starts melting one heat steel, at the initial stage of converter melting one heat steel, the molten iron infiltration breeze bed of material enters in annular collar girder construction, and bring coke slag charge when entering into and pour in annular collar girder construction together, stoped by annular collar girder construction and solidify, now molten iron, coke slag charge, chrome corundum ramming mass mixes, and in steelmaking process under molten iron high temperature action, the breeze bed of material, the magnesia carbon brick jail working lining of chrome corundum ramming mass annular collar girder construction layer and converter is combined into an entirety securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, passage by bleed-out is all shut.
7. the leakproof treatment process of steel-making converter furnace bottom according to claim 6, is characterized in that: the filler used in converter molten pool building process is chrome corundum mould material.
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| JP2630129B2 (en) * | 1991-09-13 | 1997-07-16 | 日本鋼管株式会社 | Brick-lined structure at the bottom of the converters |
| CN1354263A (en) * | 2000-11-16 | 2002-06-19 | 承德钢铁集团有限公司 | Seam-free furnace-building method for fixed converter |
| CN100532582C (en) * | 2007-09-28 | 2009-08-26 | 武汉钢铁(集团)公司 | Comprehensive Bricklaying Method for Spherical Bottom of Converter |
| JP5463623B2 (en) * | 2008-03-26 | 2014-04-09 | Ｊｆｅスチール株式会社 | Brick structure of converter bottom blowing tuyere |
| CN202968608U (en) * | 2012-12-04 | 2013-06-05 | 杭州钢铁集团公司 | Converter bottom and converter |
| CN203683576U (en) * | 2014-01-26 | 2014-07-02 | 武汉钢铁集团精鼎工业炉有限责任公司 | Steel leakage control structure on bottom of steelmaking converter |
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