CN103740887A - 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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- CN103740887A CN103740887A CN201410036023.8A CN201410036023A CN103740887A CN 103740887 A CN103740887 A CN 103740887A CN 201410036023 A CN201410036023 A CN 201410036023A CN 103740887 A CN103740887 A CN 103740887A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 45
- 239000010959 steel Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000009628 steelmaking Methods 0.000 title claims abstract description 33
- 239000011449 brick Substances 0.000 claims abstract description 159
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 88
- 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 39
- 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 21
- 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 27
- 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
- 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
- 238000010586 diagram Methods 0.000 description 1
- 238000009851 ferrous metallurgy 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
- 238000005498 polishing Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
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- 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 ferrous metallurgy field, specifically a kind of steel-leakage preventing structure of steel-making converter furnace bottom and the technique processed for furnace bottom steel-leakage preventing.
Background technology
The furnace lining structure of the top compound oxygen blowing converter in the end is comprised of refractory materials, is divided into permanent layer and working lining.Wherein: permanent layer lining brick multiselect, with burning till magnesia brick, has good physical and chemical performance and shock resistance erosional competency, and possesses 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 mechanical shock and the polishing machine that can resist molten steel.
Yet, due to the design defect of the furnace lining structure of the converter of the different type of furnaces be subject to the restriction of production operation technique, in the process of using in reality, all there is more problem, when serious, cause stopping production, caused larger loss.It is more common problem that flanging position, furnace bottom molten bath exists the phenomenon of folder steel, when serious, can lead to bleed-out accident.Its major cause is that flanging position, molten bath district born the strong erosion of molten steel in smelting process, in the Converter labour middle and later periods, flanging tile stove serves as a contrast progressively attenuate, the magnesia carbon brick damage of furnace bottom and molten pool working layer is comparatively serious, concentrate on especially flanging brick top, molten bath 1-2 layer operational layer brick, moving back platform region is easy to just by steel scrap and molten steel, be washed away in the blow-on stage, do not have the mechanics stabilization of well pushing down furnace bottom operational layer brick, cause in grate process, furnace bottom working lining is loosening, 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 of processing for furnace bottom steel-leakage preventing according to the deficiencies in the prior art; the present invention has just played 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 has played huge provide protection; make whole furnace bottom all very firm in the whole stove labour stage, stopped 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 sets gradually from outside to inside magnesium brick permanent layer and the magnesia carbon brick work layer in steel-making converter shell, 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: 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), in magnesia carbon brick working lining inner side, form an annular collar girder construction, annular ring girder construction covers the connecting portion of body of heater working lining and furnace bottom working lining completely, surface coverage in annular collar girder construction has the breeze bed of material, the breeze bed of material and annular collar girder construction connect as one by the magnesia carbon brick working lining of molten steel and steel melting furnace, the described breeze bed of material is long-pending the forming of breeze stockpile after coke burning when the blow-on of steel-making converter employing coke, coke blow-on is a kind of common blow-on mode of steel-making tile stove, exactly after steel-making converter lays, coke is hung in body of heater to a kind of technique of being burnt refractory materials in body of heater is toasted by coke.
Conventional coke blow-in method is: before baker adds coke, must bottom blowing nitrogen is logical upper, nitrogen flow be controlled at 120Nm3/h(wherein every gas permeable brick air flow be 15Nm3/h); With steel scrap bucket, in stove, add red coke 6t, grate makes it be uniformly distributed in furnace bottom, and lower rifle oxygen supply starts the little fiery temperature raising of requirement, makes temperature of furnace lining rising.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.In baker process, observe fire door flame situation, baking 60min left and right starts to add coke 500kg, adds coke 500kg every 30 minutes later.Require baking time to be 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 in every 30 minutes, is divided into process coke add-on 2-4t 4 times.The control of oxygen flow: in first 15 minutes, oxygen flow is controlled at 4800Nm3/h; 15-75 minute; Oxygen flow is controlled at 5500Nm3/h; After 75 minutes, oxygen flow is controlled at 7500Nm3/h.Baker is assumed unified command of by furnace superintendent, and rifle position, oxygen flow are carried out 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, recovers former rifle position after 2 minutes.
The further technical scheme of the present invention: described furnace bottom working lining is to be built by laying bricks or stones and form according to cross-shaped symmetrical from furnace bottom center by magnesia carbon brick, and on furnace bottom working lining, form the cruciform axis that axis of pitch is 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 respectively master lock brick district, in the working lining of furnace bottom flanging position, the position in region, four right angles of corresponding furnace bottom working lining is at least provided with an auxiliary neck brick district, and the angle between Qie Meiliangge neck brick district is equal to or less than 45 °.Optimal technical solution is that described auxiliary neck brick district also has four, being laid in respectively four right angle arc areas of furnace bottom position working lining take on the bisector that furnace bottom central point is starting point, four auxiliary neck brick districts and four master lock brick districts are alternately distributed, if the medullary ray of trunnion of converter direction of take is benchmark, the direction of its tap hole is 0 °, the two-end-point of its this medullary ray is respectively 0 °, 180 °, four master lock brick districts are distributed in 0 ° of furnace bottom, 90 °, the position of 180 ° and 270 °, four auxiliary neck brick districts distribute 45 ° of furnace bottoms, 135 °, the position of 225 ° and 315 °, the angle forming between every two adjacent neck brick districts and the furnace bottom line of centres 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: it is inclined-plane that described master lock brick district and auxiliary neck brick district all adopt a wherein side, 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 of 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 clamping.Described master lock brick district and auxiliary neck brick district all have flat block of multilayer magnesium carbon neck brick to form, generally take five layers as preferred plan, specifically according to the thickness of magnesia carbon brick, determine, and the height in all master lock bricks district and auxiliary neck brick district is consistent with other region height of flanging position working lining, and highest face temperature is consistent with the outer rim height of upper surface after furnace bottom position working lining processing levelling; Every layer all has at least five 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 junction at furnace bottom working lining and flanging position working lining, chrome corundum ramming mass is entered in the whole circle gap of furnace bottom working lining and working lining junction, flanging position, and on the surface of furnace bottom working lining and working lining junction, flanging position, form the collar tie beam structure of an annular, and natural curing 36-48 hours, under state of nature, placing exactly 36-48 hour, is also the normal step that existing converter is built by laying bricks or stones;
(2) after treating 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, the annular collar girder construction of building formation by chrome corundum ramming mass in step (1) is covered simultaneously, on its surface, form the breeze bed of material;
(3) after furnace bath finishes under coke baking, the intensity that is the collar tie beam structure of chrome corundum ramming mass formation reaches 40%-60%, finish 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 when entering, bring coke slag charge into and pour in together annular collar girder construction, by annular collar girder construction, stoped and solidify, molten iron now, 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 integral body securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, the passage that is about to bleed-out is all shut.
The filler using 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 are all as follows:
The present invention is built and is formed an annular collar boom support by chrome corundum ramming mass in furnace bottom working lining and the body of heater working lining junction of steel-making converter, this annular collar boom support covers furnace bottom working lining and body of heater working lining connecting portion completely, and in body of heater maintenance and burning carbon process, be combined with carbon residue, and be combined as a whole with body of heater working lining and furnace bottom working lining by the infiltration of steel-making molten steel after bonding, thereby realize the effect that the passage of bleed-out is all shut, make whole furnace bottom all very firm in the whole stove labour stage, having stopped molten steel penetrates, phenomenon and the bleed-out accident of folder steel.
The present invention is simple in structure, enforcement is convenient, utilize the intensity of chrome corundum ramming mass self, after adding coke blow-on, residual slag charge and molten iron mixes, the molten iron infiltration breeze bed of material enters in annular collar girder construction, make the magnesia carbon brick jail working lining of the breeze bed of material, annular collar girder construction layer and converter be combined into securely an integral body, thereby realize the object that furnace bottom working lining and body of heater working lining connecting portion are shut completely.
After the invention process, effect is better, and slag charge layer and furnace lining magnesia carbon brick are combined into an integral body securely, thereby realizes the effect that the passage of flanging position bleed-out is all shut, and converter does not occur that in the production later stage molten steel penetrates, presss from both sides phenomenon and the bleed-out accident of steel again.
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 that is provided with neck brick face of the present invention;
Fig. 3 is the local enlarged diagram 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 and the magnesia carbon brick that comprise steel melting furnace shell 1 and set gradually from outside to inside in steel melting furnace shell are made 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: at body of heater working lining 3 and furnace bottom working lining 5 connecting portions, by building chrome corundum ramming mass, (buy the CGD-90 of the metallurgical Science and Technology Ltd. of Wuhan Ke Shengyuan, also can adopt other chrome corundum ramming mass) in magnesia carbon brick working lining inner side, form an annular collar girder construction 6, annular ring girder construction 6 covers body of heater working lining 3 and the connecting portion of furnace bottom working lining 5 completely, at the logical breeze bed of material 7 that is coated with in the surface of annular collar girder construction 6, the described breeze bed of material 7 is long-pending forming of breeze stockpile after coke burning when the blow-on of steel-making converter employing coke, by normal coke process of the start-up, just can form the breeze bed of material 7 on annular collar girder construction 6 surfaces, 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 molten steel just can connect as one the magnesia carbon brick working lining of the breeze bed of material 7, annular collar girder construction and steel melting furnace.
As shown in Figure 4, described furnace bottom working lining 5 is according to cross-shaped symmetrical, to be built by laying bricks or stones and form from furnace bottom center by magnesia carbon brick, and on furnace bottom working lining 5, form the cruciform axis that axis of pitch is corresponding with the gudgeon line of converter, and furnace bottom working lining 5 is divided into four right angle arc areas by cruciform axis, the 250 tons of converters of take are example, 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, take converter two gudgeon direction centers is benchmark, it is projected as 90 ° of-270 ° of medullary rays of furnace bottom working lining, centered by this line, build first row magnesia carbon brick by laying bricks or stones, centered by this row, to both sides, respectively build again two row's magnesia carbon bricks, built altogether five row's magnesia carbon bricks by laying bricks or stones, the medullary ray of the large face direction in front and back of take is again benchmark, it is projected as 0 ° of-180 ° of medullary ray of furnace bottom working lining, centered by this line, build first row magnesia carbon brick by laying bricks or stones, centered by this row, to both sides, respectively build again two row's magnesia carbon bricks, five row's magnesia carbon bricks have been built altogether by laying bricks or stones, the five rows magnesia carbon brick parallel with trunnion of converter line of building by laying bricks or stones with 90 ° of-270 ° of medullary rays of furnace bottom, with the five rows magnesia carbon brick vertical with trunnion of converter line of building by laying bricks or stones with 0 ° of-180 ° of medullary ray of furnace bottom, form an orthogonal cross axis, and stove is divided equally into four right angle arc areas by furnace bottom position, then with four right angle arc areas of position, cross axis symmetrical masonry heater bottom working lining 3, each right angle arc area is alternately built by laying bricks or stones and is formed according to herring-bone its square edge of mind-set from furnace bottom, brickwork joint≤2mm, bottom three angle seams are tamped by chrome corundum mould material.Described furnace bottom flanging position working lining 4 is looped around furnace bottom working lining 5 outer rims, four endpoint locations at furnace bottom flanging position working lining 4 interior corresponding furnace bottom working lining 5 cruciform axis are laid with respectively master lock brick district 8, position in furnace bottom flanging position working lining 4 regions, 5 four right angles of interior corresponding furnace bottom working lining is at least provided with an auxiliary neck brick district 9, and the angle between Qie Meiliangge neck brick district is equal to or less than 45 °.250 tons of converters of the Wuhan Iron and Steel Plant of take steel-making head factory three subsidiary factory are example, the building method that position, limit working lining 4 is concrete: flanging position working lining 4 build totally five layers by laying bricks or stones, at furnace bottom, draw five row's brick ending regions of wire cross, 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 build first ring flanging brick by laying bricks or stones, brick number is MTD303, 304 two kinds of long 450mm brick types coordinate builds by laying bricks or stones, as shown in Figure 2 and Figure 4, five lamination limit bricks are being built 0 ° by laying bricks or stones, 90 °, 180 °, 270 ° four 8 places, master lock brick district, with five block length bricks, be processed as magnesium carbon neck brick 10 respectively, as shown in Figure 5, described magnesium carbon neck brick 10 1 sides are inclined-plane, opposite side is vertical surface, and the angle of inclination on inclined-plane is set according to the outside surface angle of inclination of the furnace bottom position working lining 5 outermost one circle magnesia carbon bricks of building by laying bricks or stones, require magnesium carbon neck brick processing length 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 one end near magnesium brick permanent layer holds out against magnesium brick permanent layer 2, as shown in Figure 4, another at 45 °, 135 °, 225 °, 315 ° four 9 places, auxiliary neck brick district that locate, same employing one 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 respectively long (layer 5) brick processing of long (the 4th layer) 900mm of long (the 3rd layer) 800mm of long (second layer) 750mm of 650mm to compress, 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 respectively MTD305, 306(the 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 equally five layers, 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 first to five layer of flanging brick requires horizontal 1mm/1m brickwork joint < 2mm layer 5 to finish building, the part that furnace bottom working lining is exceeded to five lamination limit brick levels is played processing levelling with pneumatic pick, close door and be chosen in 45 ° or 315 ° of regions, adopt and first hold out against brickwork joint gage, according to physical size clip, door is closed in processing again, closing tweel block must > 1/2 full sized brick width.Three angle seams between the flanging brick in three angle seam Ji Fei neck brick districts between the magnesium carbon neck brick in neck brick district and magnesium brick permanent layer 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, alcohol resin magnesium carbon ramming mass tamping for third and fourth layer.It is identical with the material of the chrome corundum ramming mass using in annular collar girder construction 6 in the present invention that described chrome corundum mould material adopts, anhydrous industrial alcohol and resin-bonded magnesium carbon ramming mass that described alcohol resin magnesium carbon ramming mass is is 99% by concentration are mixed with and form according to weight ratio 100:7-10, wherein resin-bonded magnesium carbon ramming mass is the finished product of purchase, it is bought in finished product 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.It highly can cover the gap of furnace bottom position working lining 5 and body of heater position working lining 3 connecting portions completely.
The appearance length of working lining 4 Tui Tai extensions, top, flanging position, described molten bath is all less than 70mm.Guarantee that working lining surface moves back platform and seamlessly transitted, avoid moving back that platform is excessive subjects to washing away of steel scrap, molten iron, molten steel, reduce effect of the present invention.
Embodiment, 250 tons of converters of the Wuhan Iron and Steel Plant of take steel-making head factory three subsidiary factory are example, in converter building process, the technique of nature three angle seams between working lining magnesia carbon brick and permanent layer is filled in cancellation with magnesia, and select, 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 is wetting, with using with stirring, avoided in grate process, magnesia flows on one side, and empty phenomenon appears in the other side; In building process, control the appearance length of Tui Tai extension, top, flanging position, molten bath, requirement is controlled in 70mm, specific practice is: the permanent layer on the 7th layer of working lining is built ring and built 4 layers of M305, M306 and become to add and build 2 layers of M305, M306 brick from adding, with with M-1 and M-5, respectively build a ring, realize move back platform extension appearance length in 70mm.
The technique that this steel-making converter furnace bottom steel-leakage preventing is processed, concrete steps are as follows:
(1) after converter molten pool is built by laying bricks or stones, at the junction inwall of furnace bottom working lining and flanging position working lining, build the chrome corundum ramming mass of the CGD-90 that model that Ke Shengyuan metallurgical Science and Technology Ltd. in Wuhan produces is, chrome corundum ramming mass is entered in the whole circle gap of furnace bottom working lining and working lining junction, flanging position, and form the annular collar tie beam structure that a thickness is 100-150mm on the surface of furnace bottom working lining and working lining junction, flanging position, and natural curing 36-48 hours;
(2) after treating 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, the annular collar girder construction of building formation by chrome corundum ramming mass in step (1) is covered simultaneously, on its surface, form the breeze bed of material;
(3) after furnace bath finishes under coke baking, the intensity that is the collar tie beam structure of chrome corundum ramming mass formation reaches 40%-60%, finish 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 when entering, bring coke slag charge into and pour in together annular collar girder construction, by annular collar girder construction, stoped and solidify, molten iron now, 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 integral body securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, the passage that is about to bleed-out is all shut.
Steel-making converter in embodiment is very well when when all previous Converter Maintenance, furnace bottom is removed, in general 4 hours, just can remove complete, obtained significant utilization effect, through measuring and calculating, adopted the furnace bottom steel-leakage preventing treatment process of the present invention can be so that more than converter lining life improves 3000 heats, greatly improved converter lining life; Furnace gauge of economic furnace life 9000 according to converter is calculated, and adopts technique of the present invention can extend life of converter 1/3, more than reaching 12000 heats, has significant economic benefit.
When not using steel-leakage preventing technique of the present invention, according to 750 tons of refractory materialss of 250 tons of converters, to calculate, single seat converter overhaul once needs generation expense: the 1. main material expense of refractory materials: 4500 yuan/ton * 750 tons=337.5 ten thousand yuan of market prices; 2. building construction expense of overhaul: 300,000 yuan; 3. amount to ten thousand yuan of priming cost=337.5+30=367.5 of overhaul.
Use after the present invention, the overhaul of stove labour can extend to 1.33 by 1 year, deducted 20,000 yuan of the single converter application priming costs of this technology, and single seat converter is ten thousand yuan of year reduction cost of overhaul 367.5-367.5/1.33-2/1.33=90 directly.By above comparing calculation, can find out the present invention and greatly save converter cost, its benefit is very remarkable, and the high speed that is conducive to iron and steel enterprise's cost efficiency develops in a healthy way, and has application value widely.
Claims (8)
1. the steel-leakage preventing structure of a steel-making converter furnace bottom, comprise steel melting furnace shell (1) and set gradually from outside to inside magnesium brick permanent layer (2) and the magnesia carbon brick working lining in steel melting furnace shell, 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: at body of heater working lining (3) and furnace bottom working lining (5) connecting portion, by building chrome corundum ramming mass, in magnesia carbon brick working lining inner side, form an annular collar girder construction (6), annular ring girder construction (6) covers body of heater working lining (3) and the connecting portion of furnace bottom working lining (5) completely, on the surface of annular collar girder construction (6), be covered with the breeze bed of material (7), the breeze bed of material (7) and annular collar girder construction (6) connect 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) is according to cross-shaped symmetrical, to be built by laying bricks or stones and form from furnace bottom center by magnesia carbon brick, and at furnace bottom working lining (5) the upper formation 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; 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 respectively master lock brick district (8), in furnace bottom flanging position working lining (4), the position in (5) four regions, right angle of corresponding furnace bottom working lining is at least provided with an auxiliary neck brick district (9), and the angle between Qie Meiliangge 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 appearance length of Tui Tai extension, described molten bath flanging position working lining (4) top is all less than 70mm.
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: the height of annular ring girder construction (6) is 100-200mm, and thickness is 100-150mm.
5. 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 described breeze bed of material (7) is long-pending the forming of breeze stockpile after coke burning when the blow-on of steel-making converter employing coke.
6. the steel-leakage preventing structure of a kind of steel-making converter furnace bottom according to claim 2, it is characterized in that: it is inclined-plane that described master lock brick district (8) and auxiliary neck brick district (9) all adopt a wherein side, 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 of 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 clamping.
7. 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, junction inwall at furnace bottom working lining and flanging position working lining is built chrome corundum ramming mass, chrome corundum ramming mass is entered 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) after treating 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, the annular collar girder construction of building formation by chrome corundum ramming mass in step (1) is covered simultaneously, on its surface, form the breeze bed of material;
(3) after furnace bath finishes under coke baking, the intensity that is the collar tie beam structure of chrome corundum ramming mass formation can reach 40%-60%, finish 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 when entering, bring coke slag charge into and pour in together annular collar girder construction, by annular collar girder construction, stoped and solidify, molten iron now, 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 integral body securely, furnace bottom working lining and body of heater working lining connecting portion are shut completely, the passage that is about to bleed-out is all shut.
8. the leakproof treatment process of steel-making converter furnace bottom according to claim 7, is characterized in that: the filler using in converter molten pool building process is chrome corundum mould material.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104613775A (en) * | 2014-12-23 | 2015-05-13 | 天津二十冶建设有限公司 | Carbon brick shutting device |
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| CN103740887B (en) | 2015-04-01 |
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Address after: 430080 Wuhan, Hubei Qingshan District, No. thirty-one attached street, No. 2 Patentee after: Wuhan Jinding Polytron Technologies Inc Address before: 430080 Wuhan, Hubei Qingshan District, No. thirty-one attached street, No. 2 Patentee before: Wuhan Steel Group Jingding Industrial Furnace Co., Ltd. |