CN102672154B - Continuous-casting tundish comprehensive permanent liner and preparation method thereof - Google Patents
Continuous-casting tundish comprehensive permanent liner and preparation method thereof Download PDFInfo
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- CN102672154B CN102672154B CN201210112699.1A CN201210112699A CN102672154B CN 102672154 B CN102672154 B CN 102672154B CN 201210112699 A CN201210112699 A CN 201210112699A CN 102672154 B CN102672154 B CN 102672154B
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Abstract
The invention relates to a continuous-casting tundish comprehensive permanent liner and a preparation method thereof. The continuous-casting tundish comprehensive permanent liner is mainly characterized in that the bottom of a tundish permanent liner and the wall under a slag line are made of high alumina pouring materials, and the slag line part is made of corundum pouring materials. According to the continuous-casting tundish comprehensive permanent liner provided by the invention, the long service life and low cost are achieved, the average service life is increased more than doubled on a year-on-year basis;, and the refractory material cost of the continuous-casting tundish permanent liner is reduced by more than 25% on the year-on-year basis.
Description
Technical field
The present invention relates to comprehensive permanent liner of a kind of continuous casting tundish and preparation method thereof, belong to Ferrous Metallurgy continuous casting tundish technical field of refractory materials.
Background technology
Continuous casting tundish permanent liner mainly adopts the integrated poured technology of high alumina castable at present, the common technology problem existing is, at the bottom of the bag of permanent liner, slag line and and the bag wall below line adopt the high alumina castable of identical material, the damage mechanism at each position is different, the damage speed difference opposite sex is large, the working lining of its slag lining by slag Eroded after, also usually corrode the material for permanent liner in pouring at Dao Gai position, and cause the local shedding of castable, cause whole service life low, be generally 20～30 and water time, accumulative total 500～900 stoves.Normal turnover use and production cost to continuous casting tundish affect greatly.At present iron and steel is produced and is entered low margin age, and the research and development long-life, permanent liner technology ，Dui enterprise cost efficiency is significant cheaply.
CN201455216U discloses a kind of composite dreg retaining wall with holes for tundish, barricade body and mosaics, consists of, and mosaics is arranged on barricade body, on mosaics with the steel outlet hole of certain angle; Slag blocking wall body adopts magnalium matter or alumina-silica or High-Alumina or magnesia or magnalium matter material, and mosaics adopts corundum material.The deficiency of this invention is: barricade body, mosaics carry out respectively one-time cast-forming, and then assemble, toast, complex process, and production cost is high.
CN101579726 discloses a kind of composite dreg retaining wall with holes for tundish and preparation technology, comprises the slag blocking wall body and the mosaics that are arranged on tundish appropriate location; Mosaics is arranged on slag blocking wall body, and the center of mosaics is with steel outlet hole.Preparation technology is: first adopt magnalium matter or alumina-silica or High-Alumina or magnesia or magnalium matter material to carry out the cast of slag blocking wall body, then adopt corundum material to carry out the cast of mosaics; The demoulding after curing in the mold 24h after two kinds of castable initial sets, after the demoulding, natural curing 12-24h assembles, and toasts.The deficiency of this invention: barricade body, mosaics carry out respectively one-time cast-forming, and then assemble, toast, complex process, production cost is high.
Summary of the invention
The object of the invention is, the common technology problem existing for existing continuous casting tundish permanent liner, comprehensive permanent liner of a kind of tundish and preparation method thereof is provided, this tundish permanent liner is according to the serviceability requirement of molten bath, slag lining, the gravity flow pouring material of the different qualities of development and Application, long-life, the low cost of continuous casting tundish permanent liner have been realized, permanent liner improves more than 1 times average life on year-on-year basis, reaching 50 waters inferior, more than accumulative total 1500 stoves, reduce on year-on-year basis the continuous casting tundish permanent liner cost of resistance to material more than 25%.
The comprehensive permanent liner of a kind of continuous casting tundish, the comprehensive permanent liner of tundish vertical section is " U " shape, cross section is "T"-shaped or rectangle, the comprehensive permanent liner of tundish comprises from top to bottom: slag line (2), bag wall (3) and the bag end (4), it is characterized in that, at the bottom of the bag of liner in dundish, (4) and bag wall (3) all adopt high alumina castable, and slag line (2) position adopts corundum castable.
Preferably, bag base thickness degree (a) is 120～180mm, and bag wall is identical with slag line thickness, all that (b) is 100～160mm, slag line height (H) is 300～400mm, and the bag end and Bao Bijun adopt high alumina castable, and slag lining adopts corundum castable.
Preferably, the described comprehensive permanent liner of continuous casting tundish, bag base thickness degree (a) is 150～180mm, bag wall is identical with slag line thickness, is all that (b) is 120～150mm.
Described at the bottom of the comprehensive permanent liner bag of continuous casting tundish and slag line wrap below the high alumina castable of wall, by following material, formed by weight percentage: the one-level alumine 25～35% of 5mm≤granularity < 10mm, the one-level alumine 20～25% of one-level alumine 10～15%1mm≤granularity < 3mm of 3mm≤granularity < 5mm, the one-level alumine 10～15% of 0.083mm < granularity < 1mm, the special grade bauxite fine powder 8.0～12% of granularity≤0.074mm, the middle-grade magnesite clinker fine powder 4～8% of granularity≤0.074mm, granularity≤0.047mm a-AI
2o
3micro mist 1.0～3.0%, silicon powder 0.5～1.5%, sodium phosphate trimer 0.2～0.5%, pure calcium aluminate cement 2.0～4.0%, heat-resistant steel fiber 0.5～1.5%, is all weight percentage.
Alumine claims again bauxite; Used for refractory material bauxite (raw material) is general main is to look its Al
2o
3the height of content comes classification, Al
2o
3> 75% is superfine, and 70-75%'s is one-level, and 60-70%'s is secondary, and 50-60%'s is three grades, and 45-55%'s is level Four.Its impurity F e2O3 General Requirements is less than 2.5% (except superfine requires to be less than 2.0%), and CaO is generally less than 0.6% (superfine requirement is less than 0.5%, and level Four is only required lower than 0.7%).Refractoriness requires higher than 1770 ℃.In addition, also can to the commercial grade of same bauxite, carry out Primary Evaluation by light microscope, be mainly the relative amount of measuring diaspore.The main alumine being comprised of diaspore is superfine and one-level, and the diaspore of take is main, but what contain some clay minerals (as kaolinite) is secondary; Take kaolinite as main, and what contain a great deal of diaspore is three grades simultaneously.The specification requirement of high aluminas at different levels is known to those skilled in the art.
Middle-grade magnesite clinker claims again medium-grade magnesite, is that to take the light calcined magnesia that MgO content is 97% be raw material, through explained hereafter such as pressure ball, high temperature vertical kiln calcinings, forms.Product sintering degree is good, compact crystallization.The purposes of medium-grade magnesite is: it is the quality raw materials of producing middle-grade magnesia fireproof goods.
Preferably, the described pure calcium aluminate cement trade mark is CA-70.
Pure calcium aluminate cement is that to take alumina powder and selected lime stone be raw material, melts to practice produces grog through electric arc furnaces, through fine grinding, is making finished product.The trade mark is that the specific targets of pure calcium aluminate cement of CA-70 are as follows: AL
2o
368.5-71.5; CaO26.5-30.5; ≤ 0.5; Fe
2o
3≤ 0.5; Specific area (cm
2/ g)>=5000; Initial set setting time (min)>=150; Final set (h)≤6; Anti-folding>=5 of 24h curing strength (MPa), resistance to compression>=40, refractoriness (℃) 1680.Examination criteria is GB201-2000.
Described silicon powder, is commonly called as silicon ash, is the byproduct of producing metallic silicon or Antaciron, SiO in silicon ash
2content>=92%, granularity is less than 5 μ m, and granularity be less than 2 μ m account for 80～85%.
Described heat-resistant steel fiber, is to produce with the heat resisting steel containing the alloying element such as chromium nickel, and its specification is cross section 0.2mm * 1.0mm, and length has 20mm, 25mm, 30mm and 35mm, the optional trade mark be 330,310,304,446,430 wherein a kind of.
Preferably, for at the bottom of the comprehensive permanent liner bag of continuous casting tundish and slag line wrap below the high alumina castable of wall, by following material, formed by weight percentage: the one-level alumine 30% of 5mm≤granularity < 10mm, the one-level alumine 12% of 3mm≤granularity < 5mm, the one-level alumine 22% of 1mm≤granularity < 3mm, the one-level alumine 12% of 0.083mm < granularity < 1mm, the special grade bauxite fine powder 10% of granularity≤0.074mm, the middle-grade magnesite clinker fine powder 6% of granularity≤0.074mm, α-Al of granularity≤0.047mm
2o
3micro mist 2.0%, silicon powder 1.2%, sodium phosphate trimer 0.5%, pure calcium aluminate cement 3.5%, heat-resistant steel fiber 0.8%, is all weight percentage.
The described corundum castable for the comprehensive permanent liner slag lining of continuous casting tundish, by following material, formed by weight percentage: the brown corundum 28～32% of 5mm≤granularity < 10mm, the brown corundum 10～14% of 3mm≤granularity < 5mm, the brown corundum 14～18% of 1mm≤granularity < 3mm, the brown corundum 12～16% of 0.083mm < granularity < 1mm, the alumina-based alundum fine powder 10～12% of granularity≤0.074mm, the fused magnesite fine powder 4.5～5.5% of granularity≤0.074mm, the Spinel micropowder 2.5～3.5% of granularity≤0.047mm, granularity≤0.047mm α-Al
2o
3micro mist 3.5～5.0%, silicon powder 0.5～1.5%, sodium phosphate trimer 0.1～0.3%, pure calcium aluminate cement 3.5～4.5%, heat-resistant steel fiber 0.3～0.8%, is all weight percentage.
The physical and chemical index of described brown corundum, alumina-based alundum sees the following form:
The preferred trade mark of described pure calcium aluminate cement is CA-70.
Described fused magnesite is that in electric arc furnaces, melting makes with the selected natural magnesite of special A level or high-purity magnesia unslacked particle.It is high that this product has purity, and crystal grain is large, compact structure, and the strong material of resistance to slag, good thermal shock stability, is a kind of good high temperature electrical insulation material, is also to make high-grade magnesia brick, the important source material of magnesia carbon brick and unshape refractory.
Preferably, the described corundum castable for the comprehensive permanent liner slag lining of continuous casting tundish, by following material, formed by weight percentage: the brown corundum 30% of 5mm≤granularity < 10mm, the brown corundum 12% of 3mm≤granularity < 5mm, the brown corundum 16% of 1mm≤granularity < 3mm, the brown corundum 15% of 0.083mm < granularity < 1mm, the alumina-based alundum fine powder 10% of granularity≤0.074mm, the fused magnesite fine powder 4.5% of granularity≤0.074mm, the Spinel micropowder 3.0% of granularity≤0.047mm, granularity≤0.047mm a-AI
2o
3micro mist 4.0%, silicon powder 1.0%, sodium phosphate trimer 0.15%, pure calcium aluminate cement 4.0%, heat-resistant steel fiber 0.35%, is all weight percentage.
The present invention also provides the preparation method of the comprehensive permanent liner of described continuous casting tundish, comprises the following steps:
1) castable is prepared: the required high alumina castable of the comprehensive permanent liner of continuous casting tundish, the material preparation of corundum castable: after above-mentioned material is weighed by described proportioning, add in batch mixer and stir evenly, be dry mixed 5～10 minutes, after stirring, pack standby.
2) tundish box hat is prepared: on tundish Baogang shell, adopt Methods of OFC-A to set up steam vent, and steam vent diameter ￠ 10～16, pitch of holes M is 200～400mm; On tundish box hat inwall, welding " V " shape anchor nails, adopts heat-resisting reinforcing bar ￠ 10～￠ 16, and the vertical height m of " V " shape anchor nails is about 2/3 of bag wall thickness a below material for permanent liner in pouring slag line, and anchor nails spacing N is 100～200mm.
3) high alumina castable batch mixing is prepared: remove foreign material in mixer, in the high alumina castable mixer of falling people, be dry mixed after 1～2 minute, add 6～8% water to mix.
4) at the bottom of cast permanent liner bag: with spade, the high alumina castable after mixing is put into position, tundish bag bottom, adopt the vibration moulding of plug-in type vibrating rod, discharge the interior bubble of castable until castable is fully closely knit, surfacing, and guarantee that bag bottom pour mold material feeding thickness a is 120～180mm, natural Health preservation 12～24 hours.
5) the integrated poured construction loose tool of permanent liner is prepared: after clean to the removing surface of the integrated poured construction loose tool of permanent liner before construction, evenly brush oil is standby.
6) place, fixed packet wall casting and constructing fetal membrane: above the integrated poured construction loose tool of permanent liner is put at the bottom of tundish bag at the bottom of permanent liner bag, guarantee that the casting and constructing loose tool sidewall in same level equates with the level interval of tundish involucrum sidewall, spacing b is 100～160mm.
7) the bag wall below cast permanent liner slag line: the high alumina castable after mixing is put in the gap between casting and constructing loose tool sidewall and tundish involucrum sidewall with spade, adopt the vibration moulding of plug-in type vibrating rod, insertion depth 250～350mm, discharge bubble in castable and, until castable is fully closely knit, keep surfacing.
8) corundum castable batch mixing is prepared: the high alumina castable of mixer is cleaned out, in the corundum castable mixer of falling people, be dry mixed after 1～2 minute, add 6～8% water to mix.
9) cast permanent liner slag lining: after the bag wall below permanent liner slag line is poured, the corundum castable of continuous pouring permanent liner slag lining, the same 7), slag line height H is 300-400mm.
10) natural Health preservation is 16～48 hours, 16～24 hours spring and summers, 24～48 hours autumn and winters.
11) ℃ baking and cooling 68～113h in normal temperature～450, be divided into the next stage: (1) normal temperature～150 ℃, with 4～6 ℃/h programming rate, heat up, and heating-up time 20～32h; (2) 150 ℃ of insulations, 8～16 hours time; (3) 150～450 ℃, with 12～15 ℃/h programming rate, heat up, heating-up time 20～25h; (4) 450 ℃ of insulations, 8～16 hours time; (5) truce is naturally cooling, time 12～24h.
12) the integrated poured construction loose tool of permanent liner is hung out, the comprehensive permanent liner of continuous casting tundish completes.
The invention has the beneficial effects as follows:
1) continuous casting tundish adopts comprehensive permanent liner technology, having realized permanent liner slag line synchronizeed with the service life at other positions, reaching 50 average life waters inferior, more than accumulative total 1500 stoves, improve on year-on-year basis permanent liner average life more than 1 times, reduce on year-on-year basis the continuous casting tundish permanent liner cost of resistance to material more than 25%.
2) slag lining of the comprehensive permanent liner of continuous casting tundish adopts corundum castable, solves the pit problem that this position invar scouring causes, and has improved the security reliability of permanent liner, has alleviated the repairing labour intensity of permanent liner.
The present invention applies on Laiwu steel enterprise Yin Shan shaped steel Co., Ltd each conticaster tundish of steel mill, for large H shaped steel Near-net-shape Profiled Blank Caster tundish, permanent liner average life by 25 water time bring up on year-on-year basis 50 water time more than, reach on 2000 stoves; For three platen billet continuous casting machine tundish, permanent liner average life by 30 water time bring up on year-on-year basis 60 water time more than, more than reaching 1500 stoves.Application the present invention, improves permanent liner average life more than 1 times on year-on-year basis, reduces on year-on-year basis the continuous casting tundish permanent liner cost of resistance to material more than 25%.
Accompanying drawing explanation
Fig. 1 is the comprehensive permanent liner structural representation of continuous casting tundish of the present invention.
In figure: 1-tundish involucrum; 2-permanent liner slag line; Bag wall below 3-permanent liner slag line; At the bottom of 4-permanent liner bag; 5-steam vent; 6-anchor nails; 7-casting and constructing loose tool.
The specific embodiment
Following examples are that the preparation technology of invention is further illustrated, but the present invention is not limited thereto.
Embodiment 1:
As shown in Figure 1, the comprehensive permanent liner of a kind of continuous casting tundish, the comprehensive permanent liner of tundish vertical section is " U " shape, cross section is rectangle, the comprehensive permanent liner of tundish comprises from top to bottom: slag line (2), bag wall (3) and the bag end (4), its position, molten bath, wrap the end 4 and the bag wall 3 below slag line, adopt high alumina castable, the bag ends 4 castable thickness a is 150mm, and its slag line 2 positions adopt corundum castable, and the thickness of slag line 2 and the bag wall 3 below slag line is identical, be all that b is 120mm, slag line height H is 400mm.
Described at the bottom of the comprehensive permanent liner bag of continuous casting tundish 4 and the high alumina castable of bag wall 3 below slag line, by following material, formed by weight percentage: the one-level alumine 30% of 5mm≤granularity < 10mm, the one-level alumine 12% of 3mm≤granularity < 5mm, the one-level alumine 22% of 1mm≤granularity < 3mm, the one-level alumine 12% of 0.083mm < granularity < 1mm, the special grade bauxite fine powder 10% of granularity≤0.074mm, the middle-grade magnesite clinker fine powder 6% of granularity≤0.074mm, granularity≤0.047mm α-Al
2o
3micro mist 2.0%, silicon powder 1.2%, sodium phosphate trimer 0.5%, pure calcium aluminate cement 3.5%, heat-resistant steel fiber 0.8%, is all weight percentage.
The described corundum castable for the comprehensive permanent liner slag line of continuous casting tundish 2 positions, by following material, formed by weight percentage: the brown corundum 30% of 5mm≤granularity < 10mm, the brown corundum 12% of 3mm≤granularity < 5mm, the brown corundum 16% of 1mm≤granularity < 3mm, the brown corundum 15% of 0.083mm < granularity < 1mm, the alumina-based alundum fine powder 10% of granularity≤0.074mm, the fused magnesite fine powder 4.5% of granularity≤0.074mm, the Spinel micropowder 3.0% of granularity≤0.047mm, granularity≤0.047mm α-Al
2o
3micro mist 4.0%, silicon powder 1.0%, sodium phosphate trimer 0.15%, pure calcium aluminate cement 4.0%, heat-resistant steel fiber 0.35%, is all weight percentage.
Described heat-resistant steel fiber, the trade mark is 330.
The present invention also provides the preparation method of the comprehensive permanent liner of described continuous casting tundish, comprises the following steps:
1) castable is prepared: the required high alumina castable of the comprehensive permanent liner of continuous casting tundish, the material preparation of corundum castable: after above-mentioned material is weighed by described proportioning, add in batch mixer and stir evenly, be dry mixed 5 minutes, after stirring, pack standby.
2) tundish box hat 1 is prepared: on tundish Baogang shell 1, adopt Methods of OFC-A to set up steam vent 5, and the diameter ￠ 16 of steam vent 5, pitch of holes M is 250mm; On the inwall of tundish box hat 1, welding " V " shape anchor nails 6, adopts heat-resisting reinforcing bar ￠ 10, and the vertical height h of " V " shape anchor nails 6 is about 2/3 of bag wall 3 thickness a below material for permanent liner in pouring slag line, and the spacing N of anchor nails 6 is 150mm.
3) high alumina castable batch mixing is prepared: remove foreign material in mixer, in the high alumina castable mixer of falling people, be dry mixed after 1 minute, add 6.6% water to mix.
4) at the bottom of cast permanent liner bag 4: with spade, the high alumina castable after mixing is put into the bag bottom of tundish involucrum 1, adopt the vibration moulding of plug-in type vibrating rod, discharge the interior bubble of castable until castable is fully closely knit, surfacing, and guaranteeing that bag bottom pour mold material feeding thickness a is 150mm, summer, natural Health preservation was 12 hours.
5) the integrated poured construction loose tool 7 of permanent liner is prepared: after clean to the removing surface of the integrated poured construction loose tool 7 of permanent liner before using, evenly brush oil is standby.
6) place, fixed packet wall casting and constructing fetal membrane 7: the integrated poured construction loose tool 7 of permanent liner is put at the bottom of tundish bag at the bottom of permanent liner bag above 4, the sidewall that guarantees the construction loose tool 7 in same level equates with the level interval of the sidewall of tundish involucrum 1, and spacing b is 120mm.
7) the bag wall 3 below cast permanent liner slag line: the high alumina castable after mixing is put in the gap between the construction sidewall of loose tool 7 and the sidewall of tundish involucrum 1 with spade, adopt the vibration moulding of plug-in type vibrating rod, insertion depth 250mm, discharge bubble in castable and, until castable is fully closely knit, keep surfacing.
8) corundum castable batch mixing is prepared: the low-grade high alumina castable of mixer is cleaned out, in the corundum castable mixer of falling people, be dry mixed after 1 minute, add 6.5% water to mix.
9) cast permanent liner slag line 2: after the bag wall 3 below permanent liner slag line is poured, the corundum castable of continuous pouring permanent liner slag line 2, the same 7), slag line height H is 400mm.
10) natural Health preservation, 16 hours summers.
11), in 15～450 ℃ of bakings and cooling 95h, be divided into the next stage: (1) 15～150 ℃, with 5 ℃/h programming rate, heat up, heating-up time 27h; (2) 150 ℃ of insulations, 16 hours time; (3) 150～450 ℃, with 15 ℃/h programming rate, heat up, heating-up time 20h; (4) 450 ℃ of insulations, 8 hours time; (5) truce is naturally cooling, time 24h.
12) the integrated poured construction loose tool 7 of permanent liner is hung out, the comprehensive permanent liner of continuous casting tundish completes.
Embodiment 2
Other are with embodiment 1, and difference is:
The comprehensive permanent liner of tundish vertical section is for " U ”Xing， cross section is "T"-shaped, and at the bottom of permanent liner bag, 4 castable thickness a are 180mm, and slag line 2 and bag wall 3 thickness below slag line are identical, is all that b is 150mm, and slag line height H is 300mm.
Described at the bottom of the comprehensive permanent liner bag of continuous casting tundish 4 and the high alumina castable of bag wall 3 below slag line, by following material, formed by weight percentage: the one-level alumine 25% of 5mm≤granularity < 10mm, the one-level alumine 15% of 3mm≤granularity < 5mm, the one-level alumine 20% of 1mm≤granularity < 3mm, the one-level alumine 13% of 0.083mm < granularity < 1mm, the special grade bauxite fine powder 12% of granularity≤0.074mm, the middle-grade magnesite clinker fine powder 8.0% of granularity≤0.074mm, granularity≤0.047mm a-AI
2o
3micro mist 1.3%, silicon powder 1.0%, sodium phosphate trimer 0.2%, pure calcium aluminate cement 4.0%, heat-resistant steel fiber 0.5%, is all weight percentage.
The described corundum castable for the comprehensive permanent liner slag line of continuous casting tundish 2 positions, by following material, formed by weight percentage: the brown corundum 28% of 5mm≤granularity < 10mm, the brown corundum 14% of 3mm≤granularity < 5mm, the brown corundum 12% of 1mm≤granularity < 3mm, the brown corundum 16% of 0.083mm < granularity < 1mm, the alumina-based alundum fine powder 12% of granularity≤0.074mm, the fused magnesite fine powder 5.5% of granularity≤0.074mm, the Spinel micropowder 3.5% of granularity≤0.047mm, granularity≤0.047mm a-AI
2o
3micro mist 3.5%, silicon powder 1.2%, sodium phosphate trimer 0.3%, pure calcium aluminate cement 3.5%, heat-resistant steel fiber 0.5%, is all weight percentage.
The preparation method of the comprehensive permanent liner of described continuous casting tundish, comprises the following steps:
1) castable is prepared: the required high alumina castable of the comprehensive permanent liner of continuous casting tundish, the material preparation of corundum castable: after above-mentioned material is weighed by described proportioning, add in batch mixer and stir evenly, be dry mixed 10 minutes, after stirring, pack standby.
2) tundish box hat 1 is prepared: on tundish Baogang shell 1, adopt Methods of OFC-A to set up steam vent 5, and the diameter ￠ 10 of steam vent 5, pitch of holes M is 300mm; On the inwall of tundish box hat 1, welding " V " shape anchor nails 6, adopts heat-resisting reinforcing bar ￠ 16, the vertical height m of " V " shape anchor nails 6 be about material for permanent liner in pouring slag line wrap below wall 3 thickness a 2/3, the spacing N of anchor nails 6 is 100mm.
3) high alumina castable batch mixing is prepared: remove foreign material in mixer, in the high alumina castable mixer of falling people, be dry mixed after 2 minutes, add 8% water to mix.
4) at the bottom of cast permanent liner bag 4: with spade, the high alumina castable after mixing is put into tundish bag bottom, adopt the vibration moulding of plug-in type vibrating rod, discharge the interior bubble of castable until castable is fully closely knit, surfacing, and guarantee that bag bottom pour mold material feeding thickness a is 180mm, natural Health preservation 24 hours.
5) the integrated poured construction loose tool 7 of permanent liner is prepared: after clean to the removing surface of the integrated poured construction loose tool 7 of permanent liner before construction, evenly brush oil is standby.
6) place, fixed packet wall casting and constructing fetal membrane 7: the integrated poured construction loose tool of permanent liner put at the bottom of tundish bag at the bottom of permanent liner bag 4 above, the sidewall that guarantees the casting and constructing loose tool 7 in same level equates with the level interval of tundish involucrum 1 sidewall, and spacing b is 160mm.
7) the bag wall 3 below cast permanent liner slag line: the high alumina castable after mixing is put in the gap between the sidewall of casting and constructing loose tool 7 and the sidewall of tundish involucrum 1 with spade, adopt the vibration moulding of plug-in type vibrating rod, insertion depth 350mm, discharge bubble in castable and, until castable is fully closely knit, keep surfacing.
8) corundum castable batch mixing is prepared: the high alumina castable of mixer is cleaned out, in the corundum castable mixer of falling people, be dry mixed after 2 minutes, add 8% water to mix.
9) cast permanent liner slag line 2: after the bag wall 3 below permanent liner slag line is poured, the corundum castable at continuous pouring permanent liner slag line 2 positions, the same 7), slag line height H is 350mm.
10) natural Health preservation, 48 hours winters.
11), in 26～450 ℃ of bakings and cooling 92h, be divided into the next stage: (1) 26～150 ℃, with 4 ℃/h programming rate, heat up, heating-up time 31h; (2) 150 ℃ of insulations, 8 hours time; (3) 150～450 ℃, with 12 ℃/h programming rate, heat up, heating-up time 25h; (4) 450 ℃ of insulations, 16 hours time; (5) truce is naturally cooling, time 12h.
12) the integrated poured construction loose tool 7 of permanent liner is hung out, the comprehensive permanent liner of continuous casting tundish completes.
Embodiment 3
Other are with embodiment 1, and difference is:
As shown in Figure 1, the comprehensive permanent liner of a kind of continuous casting tundish, the bag ends 4 castable thickness a is 120mm, and its slag line 2 positions adopt corundum castable, and the thickness of slag line 2 and the bag wall 3 below slag line is identical, is all that b is 100mm, and slag line height H is 350mm.
The preparation method of the comprehensive permanent liner of described continuous casting tundish, comprises the following steps:
1) castable is prepared: the required high alumina castable of the comprehensive permanent liner of continuous casting tundish, the material preparation of corundum castable: after above-mentioned material is weighed by described proportioning, add in batch mixer and stir evenly, be dry mixed 7 minutes, after stirring, pack standby.
2) tundish box hat 1 is prepared: on tundish Baogang shell 1, adopt Methods of OFC-A to set up steam vent 5, and the diameter ￠ 14 of steam vent 5, pitch of holes M is 400mm; On the inwall of tundish box hat 1, welding " V " shape anchor nails 6, adopts heat-resisting reinforcing bar ￠ 14, the vertical height m of " V " shape anchor nails 6 be about material for permanent liner in pouring slag line wrap below wall 3 thickness a 2/3, anchor nails 6 spacing N are 200mm.
3) high alumina castable batch mixing is prepared: remove foreign material in mixer, in the high alumina castable mixer of falling people, be dry mixed after 1.5 minutes, add 7.2% water to mix.
4) at the bottom of cast permanent liner bag 4: with spade, the high alumina castable after mixing is put into tundish bag bottom, adopt the vibration moulding of plug-in type vibrating rod, discharge the interior bubble of castable until castable is fully closely knit, surfacing, and guarantee that bag bottom pour mold material feeding thickness a is 120mm, natural Health preservation 16 hours.
5) the integrated poured construction loose tool 7 of permanent liner is prepared: after clean to the removing surface of the integrated poured construction loose tool 7 of permanent liner before construction, evenly brush oil is standby.
6) place, fixed packet wall casting and constructing fetal membrane 7: the integrated poured construction loose tool 7 of permanent liner put at the bottom of tundish bag at the bottom of permanent liner bag 4 above, the sidewall that guarantees the casting and constructing loose tool 7 in same level equates with the level interval of the sidewall of tundish involucrum 1, and spacing b is 140mm.
7) the bag wall 3 below cast permanent liner slag line: the high alumina castable after mixing is put in the gap between the sidewall of casting and constructing loose tool 7 and the sidewall of tundish involucrum 1 with spade, adopt the vibration moulding of plug-in type vibrating rod, insertion depth 300mm, discharge bubble in castable and, until castable is fully closely knit, keep surfacing.
8) corundum castable batch mixing is prepared: the high alumina castable of mixer is cleaned out, in the corundum castable mixer of falling people, be dry mixed after 1.5 minutes, add 7% water to mix.
9) cast permanent liner slag line 2: after the bag wall 3 below permanent liner slag line is poured, the corundum castable of continuous pouring permanent liner slag line 2, the same 7), slag line height H is 300mm.
10) natural Health preservation, 16～24 hours spring and summers, 24～48 hours autumn and winters.Those skilled in the art regulate according to degree of drying.
11), in 18～450 ℃ of bakings and cooling 88.2h, be divided into the next stage: (1) 18～150 ℃, with 6 ℃/h programming rate, heat up, heating-up time 22h; (2) 150 ℃ of insulations, 12 hours time; (3) 150～450 ℃, with 13.5 ℃/h programming rate, heat up, heating-up time 22.2h; (4) 450 ℃ of insulations, 12 hours time; (5) truce is naturally cooling, time 20h.
12) the integrated poured construction loose tool 7 of permanent liner is hung out, the comprehensive permanent liner of continuous casting tundish completes.
Claims (9)
1. the comprehensive permanent liner of continuous casting tundish, the comprehensive permanent liner of tundish vertical section is " U " shape, cross section is "T"-shaped or rectangle, the comprehensive permanent liner of tundish comprises from top to bottom: slag line (2), bag wall (3) and the bag end (4), it is characterized in that, at the bottom of the bag of the comprehensive permanent liner of tundish, (4) and bag wall (3) all adopt high alumina castable, and slag line (2) position adopts corundum castable;
Described at the bottom of the comprehensive permanent liner bag of continuous casting tundish and slag line wrap below the high alumina castable of wall, by following material, formed by weight percentage: the one-level alumine 25～35% of 5mm≤granularity<10mm, the one-level alumine 20～25% of one-level alumine 10～15% 1mm≤granularity<3mm of 3mm≤granularity<5mm, the middle-grade magnesite clinker fine powder 4～8% of special grade bauxite fine powder 8.0～12% Li Du≤0.074mm of one-level alumine 10～15% Li Du≤0.074mm of 0.083mm<granularity<1mm, Li Du≤0.047mm α-Al<sub TranNum="196">2</sub>o<sub TranNum="197">3</sub>micro-part 1.0～3.0%, silicon powder 0.5～1.5%, sodium phosphate trimer 0.2～0.5%, pure calcium aluminate cement 2.0～4.0%, heat-resistant steel fiber 0.5～1.5%, is all weight percentage.
2. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 1, it is characterized in that, bag base thickness degree (a) is 120～180mm, bag wall is identical with slag line thickness, all to be 100～160mm, slag line height (H) is 300～400mm, and the bag end and Bao Bijun adopt high alumina castable, and slag lining adopts corundum castable.
3. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 1, is characterized in that, the described comprehensive permanent liner of continuous casting tundish, and bag base thickness degree (a) is 150～180mm, bag wall is identical with slag line thickness, is to be all 120～150mm.
4. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 1, is characterized in that, the described pure calcium aluminate cement trade mark is CA-70; Described silicon powder, is commonly called as silicon ash, is the byproduct of producing metallic silicon or Antaciron, SiO in silicon ash
2content>=92%, granularity is less than 5 μ m, and granularity be less than 2 μ m account for 80～85%; Described heat-resistant steel fiber, is to produce with the heat resisting steel containing the alloying element of chromium nickel, and its specification is cross section 0.2mm * 1.0mm, and length has 20mm, 25mm, 30mm and 35mm, the trade mark be 330,310,304,446,430 wherein a kind of.
5. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 1, it is characterized in that, for at the bottom of the comprehensive permanent liner bag of continuous casting tundish and slag line wrap below the high alumina castable of wall, by following material, formed by weight percentage: the one-level alumine 30% of 5mm≤granularity<10mm, the one-level alumine 12% of 3mm≤granularity<5mm, the one-level alumine 22% of 1mm≤granularity<3mm, the one-level alumine 12% of 0.083mm<granularity<1mm, the special grade bauxite fine powder 10% of Li Du≤0.074mm, the middle-grade magnesite clinker fine powder 6% of Li Du≤0.074mm, α-Al of Li Du≤0.047mm<sub TranNum="207">2</sub>o<sub TranNum="208">3</sub>micro mist 2.0%, silicon powder 1.2%, sodium phosphate trimer 0.5%, pure calcium aluminate cement 3.5%, heat-resistant steel fiber 0.8%, is all weight percentage.
6. the comprehensive permanent liner of a kind of continuous casting tundish as described in claim 1～3 any one, it is characterized in that, the described corundum castable for the comprehensive permanent liner slag lining of continuous casting tundish, by following material, formed by weight percentage: the brown corundum 28～32% of 5mm≤granularity<10mm, the brown corundum 10～14% of 3mm≤granularity<5mm, the brown corundum 14～18% of 1mm≤granularity<3mm, the brown corundum 12～16% of 0.083mm<granularity<1mm, the alumina-based alundum fine powder 10～12% of Li Du≤0.074mm, the fused magnesite fine powder 4.5～5.5% of Li Du≤0.074mm, the Spinel micropowder 2.5～3.5% of Li Du≤0.047mm, Li Du≤0.047mm α-Al<sub TranNum="211">2</sub>o<sub TranNum="212">3</sub>micro mist 3.5～5.0%, silicon powder 0.5～1.5%, sodium phosphate trimer 0.1～0.3%, pure calcium aluminate cement 3.5～4.5%, heat-resistant steel fiber 0.3～0.8%, is all weight percentage.
7. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 6, is characterized in that, the described pure calcium aluminate cement trade mark is CA-70.
8. the comprehensive permanent liner of a kind of continuous casting tundish as claimed in claim 6, it is characterized in that, the described corundum castable for the comprehensive permanent liner slag lining of continuous casting tundish, by following material, formed by weight percentage: the brown corundum 30% of 5mm≤granularity<10mm, the brown corundum 12% of 3mm≤granularity<5mm, the brown corundum 16% of 1mm≤granularity<3mm, the brown corundum 15% of 0.083mm<granularity<1mm, the alumina-based alundum fine powder 10% of Li Du≤0.074mm, the fused magnesite fine powder 4.5% of Li Du≤0.074mm, the Spinel micropowder 3.0% of Li Du≤0.047mm, Li Du≤0.047mm α-Al<sub TranNum="217">2</sub>o<sub TranNum="218">3</sub>micro mist 4.0%, silicon powder 1.0%, sodium phosphate trimer 0.15%, pure calcium aluminate cement 4.0%, heat-resistant steel fiber 0.35%, is all weight percentage.
9. the preparation method of the comprehensive permanent liner of continuous casting tundish as claimed in claim 6, comprises the following steps:
1) castable is prepared: the required high alumina castable of the comprehensive permanent liner of continuous casting tundish, the material preparation of corundum castable: after above-mentioned material is weighed by described proportioning, add in batch mixer and stir evenly, be dry mixed 5～10 minutes, after stirring, pack standby;
2) tundish box hat is prepared: on tundish Baogang shell, adopt Methods of OFC-A to set up steam vent, and steam vent diameter ￠ 10～16, pitch of holes M is 200～400mm; On tundish box hat inwall, welding " V " shape anchor nails, adopts heat-resisting reinforcing bar ￠ 10～￠ 16, and the vertical height m of " V " shape anchor nails is about 2/3 of bag wall thickness a below material for permanent liner in pouring slag line, and anchor nails spacing N is 100～200mm;
3) high alumina castable batch mixing is prepared: remove foreign material in mixer, in the high alumina castable mixer of falling people, be dry mixed after 1～2 minute, add 6～8% water to mix;
4) at the bottom of cast permanent liner bag: with spade, the high alumina castable after mixing is put into position, tundish bag bottom, adopt the vibration moulding of plug-in type vibrating rod, discharge the interior bubble of castable until castable is fully closely knit, surfacing, and guarantee that bag bottom pour mold material feeding thickness a is 120～180mm, natural Health preservation 12～24 hours;
5) the integrated poured construction loose tool of permanent liner is prepared: after clean to the removing surface of the integrated poured construction loose tool of permanent liner before construction, evenly brush oil is standby;
6) place, fixed packet wall casting and constructing fetal membrane: above the integrated poured construction loose tool of permanent liner is put at the bottom of tundish bag at the bottom of permanent liner bag, guarantee that the casting and constructing loose tool sidewall in same level equates with the level interval of tundish involucrum sidewall, spacing b is 100～160mm;
7) the bag wall below cast permanent liner slag line: the high alumina castable after mixing is put in the gap between casting and constructing loose tool sidewall and tundish involucrum sidewall with spade, adopt the vibration moulding of plug-in type vibrating rod, insertion depth 250～350mm, discharge bubble in castable and, until castable is fully closely knit, keep surfacing;
8) corundum castable batch mixing is prepared: the high alumina castable of mixer is cleaned out, in the corundum castable mixer of falling people, be dry mixed after 1～2 minute, add 6～8% water to mix;
9) cast permanent liner slag lining: after the bag wall below permanent liner slag line is poured, the corundum castable of continuous pouring permanent liner slag lining, the same 7), slag line height H is 300-400mm;
10) natural Health preservation is 16～48 hours, 16～24 hours spring and summers, 24～48 hours autumn and winters;
11) ℃ baking and cooling 68～113 h in normal temperature～450, be divided into the next stage: (1) normal temperature～150 ℃, with 4～6 ℃/h programming rate, heat up, and heating-up time 20～32h; (2) 150 ℃ of insulations, 8～16 hours time; (3) 150～450 ℃, with 12～15 ℃/h programming rate, heat up, heating-up time 20～25h; (4) 450 ℃ of insulations, 8～16 hours time; (5) truce is naturally cooling, time 12～24h;
12) the integrated poured construction loose tool of permanent liner is hung out, the comprehensive permanent liner of continuous casting tundish completes.
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