CN103224401B - Energy-efficient sol combined mullite castable used for blast furnace air supply branch pipe inner liner - Google Patents
Energy-efficient sol combined mullite castable used for blast furnace air supply branch pipe inner liner Download PDFInfo
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- CN103224401B CN103224401B CN201210365011.0A CN201210365011A CN103224401B CN 103224401 B CN103224401 B CN 103224401B CN 201210365011 A CN201210365011 A CN 201210365011A CN 103224401 B CN103224401 B CN 103224401B
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Abstract
The invention discloses an energy-efficient sol combined mullite castable used for a blast furnace air supply branch pipe inner liner, which belongs to the refractory material technical field. The energy-efficient sol combined mullite castable used for the blast furnace air supply branch pipe inner liner comprises the following raw materials by weight: 50-55% of calcining kaolin granules, 4-6% of quartz sand, 14-20% of mullite powder, 6-10% of brown lapis amiridis, 5-10% of alpha-active alumina micro powder, 0.9-1.3% of magnesium oxide powder, 1-2% of dispersible alumina and 8-12% of silica sol. The energy-efficient sol combined mullite castable has the advantages of excellent physical and chemical performances, low cost, good application property and short making period, and is the high-quality inner liner material adapted to operation and making condition of the blast furnace air supply branch pipe.
Description
Technical field
The invention belongs to and belong to technical field of refractory materials, be specifically related to that a kind of volume stability for blast branch pipe of blast furnace liner is good, good thermal shock stability, can fast setting, quick baking, intensity is high, cost is low colloidal sol be in conjunction with mullite pouring material.
Background technology
In prior art, blast branch pipe of blast furnace is to be the device of iron-smelting blast furnace air-supply, and the hot blast that it sends bustle pipe here is blown into cupola well by tuyere equipment, is also the device to pulverized coal injection into blast furna powder fuel simultaneously, being the vital position of casthouse equipment, is link the weakest in supply air system.Blast branch pipe of blast furnace is generally made up of several major parts such as adapter bonnet, metallic bellows, bend pipe and belly pipes, and most of liner is indefinite form refractory castable.Airduct liner is for a long time in the severe environment such as high temperature, high pressure, high velocity air wash away, and wherein elbow is subject to air-flow scouring force larger, and belly pipe caliber is less and pipe shaft is elongated, and especially bulb position is the minimum place of caliber, and liner is thinner.Current domestic hotblast stove hot blast temperature is out generally 1200～1300 DEG C, the thermal-insulating sealing performance of elbow and belly pipe directly affects the temperature of blast-furnace hot-air, and in blast furnace production process, there is inevitable damping down, the water coolant effect of the belly pipe bulb position water-cooling groove of multiple character and conduct work and large blast furnace, all make arm liner produce immeasurable internal stress because of excessive difference variation, in the time that this internal stress exceeds the strength of materials limit, inner lining material produces cracking, therefore need its inner lining material to there is volume stability, good thermal shock stability, energy fast setting, quick baking, intensity is high, the characteristic of good heat insulating.In prior art, this position low cement corundum (mullite) mould material that adopt more, the critical defect that they exist is all the time:
1) volume stability is not good enough---and low cement deposit material (1300 DEG C of <) under working temperature does not also reach (1300 DEG C of >) between breathing space because of the swelling agent adding, in addition the effect of eutectic, build lining body and be all shown as volumetric shrinkage, now cracking very easily, it is one of important factor that shortens blowpipe work-ing life.
2) thermal shock resistance is low---and it is larger that low cement deposit material varies with temperature material dilation, and the internal stress that excessive difference variation produces has caused liner body structure damage, is reflected as lining body cracking, peels off.From the physical index of material, for only 20 left and right of low cement deposit material thermal stability (1100 DEG C of water-cooleds) of blast branch pipe of blast furnace, cause thus blowpipe surface temperature rising, rubescent, shell heat radiation is serious, the hot blast temperature that enters blast furnace declines, waste mass energy, the normal production of serious harm blast furnace.On the other hand, cause frequently and overhaul, change blowpipe and also bring the financial loss of no small blast furnace staying and blowpipe material, making to iron and steel enterprise.
3) liner body structure low strength under use temperature---in mould material, due to the adding of eutectic cement, its high-temperature physical property is lost, and causes liner body structure wear resisting property to reduce, and structural strength is not enough to resist excessive temperature stress and damages simultaneously.
4) long construction period---the lining body material using low cement deposit material as blowpipe, according to the characteristic of cement bonding agent, in prefabricated process, maintenance, baker are vital links, generally the fabrication cycle of blowpipe liner is minimum is not less than 120 hours, and oven drying temperature is the highest only rises to 300 DEG C, still there will be the lining body phenomenon of bursting apart when the heat-up rate in later stage is too urgent, the visible fabrication cycle of building lining body that how to shorten, improve baker system, being the key point that reduces equipment making cost, is our task of top priority.
So the hard nut to crack of air-supply apparatus of blast furnace is that fabrication cycle is long, leaks out in use procedure, rubescent, appearance temperature is high, work-ing life is short etc. all the time, these all need just can tackle the problem at its root by the perfect of inner lining material performance.
Summary of the invention
For the above-mentioned deficiency of prior art, the technical problem to be solved in the present invention is to provide a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable in conjunction with mullite pouring material, this mould material has volume stability, good thermal shock stability, can fast setting, quick baking, intensity is high, cost is low characteristic, be the effective way that solves blast branch pipe of blast furnace device hard nut to crack in prior art.
Technical scheme of the present invention is: a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to is made up of following material component and weight percentage in conjunction with mullite pouring material:
Described a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to is made up of following material component and optimum weight percent in conjunction with mullite pouring material:
Described calcined kaolin particulate material meets following requirement: AL
2o
343～45%, SiO
249～53%, Fe
2o
3≤ 0.8%; Calcining temperature>=1400 DEG C; Volume density>=the 2.5g/cm of calcined kaolin particulate material
3; The granularity of calcined kaolin particulate material is 0.088mm～5mm.
Described quartz sand particle material meets following requirement: SiO
2>=99%; The granularity of quartz sand particle material is 0.088mm～0.5mm.
Described mullite powder meets following requirement: AL
2o
358～72%, SiO
227～41%, Fe
2o
3≤ 0.5%; The granularity of mullite powder is≤0.074mm.
Described brown alundum powder meets following requirement: AL
2o
3>=95%, SiO
2≤ 1%, Fe
2o
3≤ 0.25%; The granularity of brown alundum powder is≤0.074mm.
Described α-Reactive alumina granularity≤2 μ m.
Described magnesia powder granularity is≤0.074mm.
Described silicon sol meets following requirement: SiO
2>=40%, R
2o≤0.3%; PH=8.5～10 of silicon sol; The median size of silicon sol is 10～20nm.
Described a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to is in conjunction with mullite pouring material, and wherein, silicon sol is packed separately; All the other components are mixed into dry shape through mechanical stirring after weighing by proportioning and evenly gather materials; At the construction field (site), by separately packaging silicon sol and dry shape evenly gather materials and weigh by proportioning, mix and stir after inserted in the blowpipe mould having assembled, use vibrating head jolt ramming.
Energy-saving colloidal sol of the present invention is in conjunction with the physicochemical property excellence of mullite pouring material, and cost is low, and workability is good, and fabrication cycle is short, is a kind of high-quality inner lining material that is suitable for blast branch pipe of blast furnace operation and manufacturing conditions.This mould material is made bonding agent with silicon sol, and it is with its original characteristic, with the acting in conjunction of other starting material (aluminium silicon system) under, there is following characteristics:
1) this mould material is a kind of with the quick-setting refractory materials of spatial grid structure, lining body after solidifying comes true because the characteristic of spatial grid structure makes quick baking, at present, material of the present invention is in the time of blowpipe lining processing, accomplished mould material after vibratory compaction 1 hour solidify, then maintenance just can be carried out form removal in 0.5 hour, slightly rest and reorganize (natural curing 6h) can toast, baking time 10 hours, top temperature only needs to rise to 200 DEG C to get rid of the free water in lining body.And the making duration of prior art is 122 hours, the present invention at least can shorten 104.5 hours (only calculating with single), improves and makes speed more than 85%, and the application of this mould material is one of effective measure that realize " energy-conservation, reduction of discharging, synergy ".
2) this mould material is the refractory materials of volume stability, particularly, in the time building working lining temperature 1000 DEG C of left and right, starts to manifest the characteristic of micro-volumetric expansion, and this mould material is the good work inner lining material of sealing effectiveness.And the material of prior art in working temperature section (1200 DEG C of left and right) because volumetric shrinkage is large, easily produce shrinkage crack.
3) this mould material is the refractory materials of good thermal shock stability, it has effectively overcome convention liner material and has produced compared with large expansion, shrinks that internal stress ftractures, the defect of peeling phenomenon because of difference variation, according to detecting data presentation its thermostability average > 100 times (1100 DEG C of water-cooleds), this mould material is that the Thermal Equipment novel refractory in work-ing life is imitated, extended to environment purification, energy-conservation wound.
4) this mould material is all good in the structural strength of each temperature section, the refractory materials of excellent property, particularly middle-temperature section (800～1300 DEG C) is because of mullitization, make to build lining body and there is desirable structural strength, general this temperature section ultimate compression strength is 60MPa～90MPa, this numerical value is beyond one's reach in the prior art, and this mould material is very suitable for blast branch pipe of blast furnace (1200 DEG C of left and right of normal working temperature) as work inner lining material.
5) this mould material is the refractory materials of excellent thermal insulation performance, and in material of the same type, it,, by feat of the minimum advantage of self thermal conductivity, makes the heat-sinking capability that serves as a contrast body material drop to lower-most point, and this mould material is the good refractory materials of energy-saving effect.
6) this mould material is the refractory materials that resource loss is lower, and it has realized with lower volume density few feature of drawing materials under same volume condition in material of the same type, and this mould material is save energy, the preferred refractory materials that reduces waste discharge.
7) raw material drawing of this mould material is in domestic refractory materials, cost is moderate, especially in main composition quartz sand and calcined kaolin reserves abundant especially, (calcined kaolin is lower more than 50% than the main material bauxite chamotte cost of bottom price in prior art) with low cost, tally with the national condition, use suits large area to popularize.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the present invention is explained in detail.The applicant before making the present invention, to existing blast branch pipe of blast furnace surface temperature in prior art raise, rubescent, shell heat radiation is serious etc., and problem has been done a large amount of investigation, now illustrates.
Physicochemical property and the service condition of the low cement deposit material of blast branch pipe of blast furnace liner that following table 1 Shi Mou factory produces:
Table 1, the low cement deposit material physicochemical property of certain factory's blast branch pipe of blast furnace liner and service condition
The blowpipe inner lining material of this factory adopts low cement deposit material, in making processes, due to the characteristic of cement bonding agent, make striking time and need 5～8 hours, curing time needs about 3 days, furnace drying time needs more than 50 hours, and oven drying temperature is the highest only rises to 300 DEG C, at this moment the free moisture content serving as a contrast in body is got rid of, but still retain the crystal water of nearly 30% left and right, first use is worked as temperature and is exceeded 300 DEG C, the too urgent excessive water vapour of heat-up rate is discharged and is obstructed, accumulate in to build in lining body and produce immeasurable vapor pressure, cause the lining body phenomenon of bursting apart to happen occasionally.In use (1200 DEG C of left and right of use temperature), because forming new mineral structure hydration key in the process of dehydration and decomposition, destroyed hydrated reaction of cement, be converted into highdensity hydrate and anhydrous mineral by low-density hydrate, cause volumetric shrinkage, porosity increases, and the bonded area of thing phase declines, and now the Ceramic bond of storeroom not yet forms, the swelling agent adding does not reach between breathing space, and liner body structure intensity is not high and easily produce shrinkage crack.Blast furnace in operational process, inevitably do by damping down, multiple character and conduct in addition, be not enough to for the lower blowpipe liner of structural strength the dilation stress that opposing is caused by the temperature difference, cause lining body heat shake poor stability, physical index reflection thermal shock resistance (1100 DEG C of water-cooleds) 24 times, final lining body ftractures, peels off, and causes blowpipe to leak out, rubescent, appearance temperature is high, shortening in work-ing life.In sum, in prior art, the making of blast branch pipe of blast furnace is long in time limit, in use because lining body volume stability is not good enough, structural strength is poor, thermal shock resistance is difficult to meet the service requirements of operation of blast furnace, consequent arm lining body cracking, the ordinary generation of peeling phenomenon, these are all difficult problems anxious to be resolved in prior art.
The technical thought of the present invention's development is: by selecting volume stability and the good material (the low flux material of the least possible introducing) of high-temperature physical property, be equipped with silicon sol bonding agent, by technological adjustment, develop the blowpipe inner lining material that is suitable for blast furnace environment for use.First framework material selects calcined kaolin particle to gather materials, calcined kaolin granularity 0.088～5mm, this material is to be formed through 1400 DEG C～1500 DEG C calcinings by hard kaoline, and wherein main component is mullite (being transformed by kaolin), and a small amount of composition is the impurity component of cristobalite and trace.Wherein mullite is A1
2o
3-SiO
2unique stable binary compound in system, chemical formula is 3Al
2o
3-2SiO
2, it has the features such as expansion is even, thermal shock resistance is fabulous, load softening point is high, high temperature creep value is little, hardness is large, resistance to chemical corrosion is good, is A1
2o
3-SiO
2first-selected starting material in series refractory material, ashlar tesseral system British, under operational temperature conditions, crystallographic system is comparatively stable, and volume change is little, so see on the whole, selecting calcined kaolin is rational as the framework material of this mould material.
Substrate material selects the quartz combination of mullite powder, brown alundum powder, α-Reactive alumina and an expansion of volume stability to form.The mineralogical character of mullite powder is the same.Brown alundum powder mineral composition is mainly α-Al
2o
3most of particle assumes diamond in shape, slab type and the particle with crackle, separately there is part melt crystallization etc., in the time that it mixes from the mullite powder of different crystal grain, under the condition of high temperature, produce fine crack because crystal grain swell increment is different in interface edge, lining body capable of blocking, because of the crack of temperature variation and vibrations generation, digests part internal stress simultaneously, improving the thermal shock resistance energy of lining body, is the effective measure of optimizing material property.α-Reactive alumina is a kind of dystectic oxide compound, is characterized in good dispersity, and specific surface area is large, active high, is easy to sintering and volume effect is little under high temperature, with SiO
2particulate reaction, progressively forms mullitization, produces volume effect (microdilatancy), and the partial volume of offsetting refractory castable shrinks, and is conducive to the raising of intensity and heat-shock resistance.Quartz belongs to trigonal system, raises volumetric expansion occurs with temperature, utilizes the high-temperature calcination between this characteristic part digestion matrix powder to shrink, and is a kind of well swelling agent material.
Bonding agent is selected silicon sol, wherein SiO
2>=40%.It is a kind of nanometer silicon oxide colloid, has larger specific surface area and stronger absorption.Colloidal gel when silica sol liquid low-temperature zone, between micelle through condensation reaction and and powder between adsorption make to have formed in matrix effective spatial grid structure, produce intensity, and the effective passage that makes to discharge water vapor is evenly unimpeded, ensure that the free water in lining body can discharge fast, realized quick baking.Avoided the disadvantage of prior art bonding agent: prior art cement bonding agent is in low-temperature zone because of cement aquation, and grain growth causes the close increase of body, has hindered drainage channel, made moisture can not discharge fast lining body, baking time requires longer.This mould material is in medium and high temperature section, combination between nanometer silicon oxide colloid in α-Reactive alumina and silicon sol, form mullitization reaction (it is 800～1000 DEG C that mullitization starts temperature), and mullite is needle-like and column crystallization is grown up, the reticulated structure that formation is interweaved, improve the fracture toughness property of material, stop micro-crack extension, produce volume effect simultaneously, offset lining body partial volume and shunk, the volume stability, heat-shock resistance and the physicals that make to serve as a contrast body are much better than other material of the same type.And silicon sol do not belong to flux raw material, make in the microtexture of material crystal content high, amount of glassy phase is low, and high-temperature physical property is good.And in prior art using cement as bonding agent, the introducing of this eutectic, vary with temperature and cause material volume stability extreme difference, show the internal stress (expansion because the temperature difference causes, string stress) greatly damage liner body structure, partial offset bonding agent produce intensity, and in the mineral structure being formed by hydrated reaction of cement, the destruction of hydration key and mineral structure transform, cause volumetric shrinkage, porosity increases, the bonded area of thing phase declines, now under the use temperature (1200 DEG C of left and right) of blowpipe, the Ceramic bond of material self not yet forms, structural strength is low, in the time of temperature difference iterative cycles, when liner body structure intensity can not effectively be resisted this internal stress, structure damage, therefore can cause the high-temperature physical property of refractory materials and thermal shock performance to be lost adding of cement bonding agent, liner body structure produces cracking and peels off.Colloidal sol can solve in conjunction with mould material the series of problems that above-mentioned cement produces in conjunction with mould material.
Solidifying agent is selected electrically molten magnesia powder, granularity is≤0.074mm, principal crystalline phase is periclasite, belongs to tesseral system, and crystalline structure is stable, 2800 DEG C of fusing points, the effect of solidifying agent is by changing cation concn in material silicon sol solution, impels collosol and gel and produces intensity, controls the curing speed of material by its add-on simultaneously, be to ensure the quick-setting key of material, all cannot accomplish in the prior art.
Principal feature of the present invention: the starting material calcined kaolin of selecting volume stability, mullite, palm fibre corundum, α-Reactive alumina, magnesium oxide etc. are as material of main part of the present invention, select dystectic magnesium oxide as solidifying agent, select quartz sand as swelling agent, select the additives such as dispersed aluminum oxide to be adjusted performance, select the bonding agent of Nano silica sol as material of the present invention, according to the characteristic of silicon sol self, develop the volume stability that is applicable to blowpipe liner, thermal shock performance is good, intensity is high, heat-insulating property and high-temperature physical property are good, curing speed is fast, energy quick baking, the low colloidal sol of cost is in conjunction with mullite pouring material, replace the low cement deposit material of blowpipe inner lining refractory in prior art, reach and extend blast branch pipe of blast furnace liner work-ing life, reduce its making, construction, use cost, . the object of protection of the environment.
Specific embodiment of the invention scheme: before adopting the present invention, certain Iron And Steel Company's blast branch pipe of blast furnace inner lining material adopts low cement deposit material, fabrication cycle needs 122 hours, the highest oven drying temperature is 300 DEG C, blowpipe liner after baking retains crystal water 28～30%, be 6～12 months work-ing life, damage shows as blowpipe liner cracking, peels off, case temperature raises, even heat up and reach as high as 500 DEG C, must, by the measure of quenching or the cooling of fetching water to ensure the normal production run of blast furnace, treat damping down replacing airduct.
Through selection and demonstration, colloidal sol of the present invention carries out commerical test application in conjunction with mullite pouring material in above-mentioned blast branch pipe of blast furnace lining material, its ingredient groups prejudice table 2.
Table 2, colloidal sol are in conjunction with mullite pouring material proportioning (weight percentage %)
| Project | Example |
| Calcined kaolin particulate material (0.088～5mm) % | 53 |
| Quartz sand (≤0.5mm) % | 4 |
| Mullite powder (≤0.074mm) % | 17 |
| Brown alundum powder (≤0.074mm) % | 9 |
| α-Al 2O 3Micro mist % | 5 |
| Magnesia powder (≤0.074mm) % | 1 |
| Dispersed aluminum oxide % | 1.2 |
| Silicon sol (solid content 40%) % | 9.8 |
The colloidal sol that the applicant provides sees the following form 3 in conjunction with mullite pouring material performance test results:
Table 3, colloidal sol of the present invention are in conjunction with mullite pouring material physicochemical property detected result
The colloidal sol that the applicant provides make in conjunction with mullite pouring material and actual service condition in table 4:
Table 4, colloidal sol of the present invention are made and practical using result in conjunction with mullite
Be not difficult to find out that by table 1,2,3,4 colloidal sol of the present invention is suitable for as blast branch pipe of blast furnace inner lining material in conjunction with mullite pouring material.Compared to existing technology, from physicals, its normal temperature strength (110 DEG C of baked strength 32.6MPa) is equivalent to normal temperature strength (the natural curing 72h of low cement deposit material, 110 DEG C of baked strength 31.1MPa), this index has no effect to the manufacture craft of blowpipe, but colloidal sol is fast in conjunction with mullite pouring material ambient cure and gain in strength speed, the ultimate compression strength (4.6MPa) of normal temperature maintenance 7h is comparable to the ultimate compression strength (5.4MPa) of low cement deposit material normal temperature maintenance 24h, therefore lining body construction striking time only needs 1.5h, after form removal, natural curing time 6h can baker, furnace drying time 10h, visible employing hydrosol can shift to an earlier date at least 3.5～6.5h in conjunction with the blowpipe lining processing demould time of mullite pouring material, natural curing time shorten 64.5h, furnace drying time shortens 40h, total can be saved mono-blowpipe of about 104.5h(of duration), improve and make speed more than 85%, simplify construction technology, reduce energy dissipation, save manpower, material resources cost.
Colloidal sol of the present invention is in conjunction with mullite ceramics cast stockline velocity of variation (1300 DEG C × 3h)+0.18%, illustrative material is microdilatancy state in operational temperature conditions lower volume, effectively avoid the generation of this mould material lining body shrinkage crack, relatively the excessive linear shrinkage ratio (1300 DEG C × 3h)-0.39% of prior art, proves that as blowpipe liner materials be rational.
Colloidal sol of the present invention in conjunction with mullite pouring material in each temperature section entire change rate less (+0.18%), add the mullitization of medium and high temperature, make to adopt hydrosol in conjunction with the lining body volume stability of mullite pouring material all the time in splendid state, demonstrate excellent thermal stability (1100 DEG C the equal > of water-cooled thermal shock resistance 100 times), this is the effective measure that improve blowpipe liner work-ing life.Large (1300 DEG C × 3h)-0.39% of low cement casting stockline velocity of variation in prior art, illustrate that the temperature difference is larger on the volume stability impact of this material, generation is expanded, string stress is larger, when liner body structure undercapacity is when contending with this stress, structure damage (ftracture, peel off), shows the thermal stability of low cement deposit material in prior art (1100 DEG C of water-cooleds) only 24 times according to table 1, so do for inevitable blast furnace staying, multiple character and conduct totally unfavorable, should be in addition perfect.
Colloidal sol of the present invention is good in conjunction with mullite pouring material high-temperature physical property, display structure intensity (1300 DEG C × 3h) 81.6MPa, far above structural strength (1300 DEG C × 3h) 67.4MPa of low cement deposit material in prior art, the wear resisting property of description architecture has had raising, is one of key factor that extends its work-ing life for long-term blowpipe liner in high-temperature high-pressure air flow environment.
Colloidal sol of the present invention is in conjunction with mullite pouring material excellent thermal insulation performance, according to physical index: thermal conductivity (1000 DEG C of hot sides) 1.10w/m.k, application actual measurement blast branch pipe of blast furnace average surface temperature is 140 DEG C of left and right (normal operating conditions), thermal conductivity (1000 DEG C of hot sides) 1.52w/m.k compared to existing technology, reduce by 27.6%, application actual measurement blast branch pipe of blast furnace average surface temperature is generally in 220 DEG C of left and right (normal operating conditions), experimental results show that: good heat insulation effect can effectively reduce heat energy loss, improve the hot blast temperature that enters blast furnace, energy utilization rate is further promoted, this mould material is the good refractory materials of energy-saving effect.
Colloidal sol of the present invention is lower in conjunction with mullite pouring material resource loss, due to the main material lower (2.4～2.58g/cm of volume density that has drawn from
3) calcined kaolin, be to be formed through calcining by hard kaoline, and in calcination process with micro-volumetric expansion, the mullite that the main component after calcining is volume stability and a small amount of cristobalite, be 2.3g/cm as this mould material volume density of main material
3left and right, compared to existing technology: the main material larger mullite of volume density (the volume density > 2.7g/cm that all has drawn from
3), alumine (volume density > 3.0g/cm
3), corundum (volume density > 3.8g/cm
3), the equal > 2.5g/cm of mould material volume density making as main material
3, this mould material volume density has reduced 0.2g/cm compared to existing technology as seen
3above, can save material approximately more than 8.4% under same volume condition, this mould material is save energy, the preferred refractory materials that reduces waste discharge.
Colloidal sol of the present invention starts to apply on the blast branch pipe of blast furnace of Duo Jia iron and steel enterprise in 2010 in conjunction with mullite pouring material.Such as 2010.5 application (A factory) on 1,2, No. 4 blast branch pipe of blast furnace of certain Iron And Steel Co., Ltd, 2010.9 application (B factory) on the new 5# blast branch pipe of blast furnace of certain steel enterprise, from reporting situations, except on a small quantity in use because of belly pipe passage stop up (A factory, B factory) and individually metallic bellows liner dilatation joint cushion cotton displacement and cause that local lining material is peeled off, shell rubescent (B factory) need be changed in advance, all the other so far (2012.6) all use normally.According to on-the-spot service condition, the applicant thinks that colloidal sol of the present invention applies work-ing life under (A factory, B factory) normal running conditions in conjunction with mullite pouring material and all can be greater than 2 years on blast branch pipe of blast furnace, compared with the prior art, colloidal sol of the present invention is in conjunction with mullite pouring material breakthrough again technically, for improve this equipment work-ing life, reduce costs significantly, be to be suitable for the needed high-quality refractory material of blast branch pipe of blast furnace liner.
Claims (8)
1. be applicable to the energy-saving colloidal sol of blast branch pipe of blast furnace liner in conjunction with a mullite pouring material, it is characterized in that described colloidal sol is made up of following material component and weight percentage in conjunction with mullite pouring material:
Described calcined kaolin particulate material meets following requirement: AL
2o
343～45%, SiO
249～53%, Fe
2o
3≤ 0.8%; Calcining temperature>=1400 DEG C; Volume density>=the 2.5g/cm of calcined kaolin particulate material
3; The granularity of calcined kaolin particulate material is 0.088mm～5mm;
Described quartz sand particle material meets following requirement: SiO
2>=99%; The granularity of quartz sand particle material is 0.088mm～0.5mm.
2. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that described colloidal sol is made up of following material component and weight percentage in conjunction with mullite pouring material:
3. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that described mullite powder meets following requirement: AL
2o
358～72%, SiO
227～41%, Fe
2o
3≤ 0.5%; The granularity of mullite powder is≤0.074mm.
4. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that: described brown alundum powder meets following requirement: AL
2o
3>=95%, SiO
2≤ 1%, Fe
2o
3≤ 0.25%; The granularity of brown alundum powder is≤0.074mm.
5. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that: described α-Reactive alumina granularity≤2 μ m.
6. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that: described magnesia powder granularity is≤0.074mm.
7. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that described silicon sol meets following requirement: SiO
2>=40%, R
2o≤0.3%; PH=8.5～10 of silicon sol; The median size of silicon sol is 10～20nm.
8. a kind of energy-saving colloidal sol of blast branch pipe of blast furnace liner that is applicable to according to claim 1, in conjunction with mullite pouring material, is characterized in that: described colloidal sol is packed separately in conjunction with the silicon sol in mullite pouring material; All the other components are mixed into dry shape through mechanical stirring after weighing by proportioning and evenly gather materials; At the construction field (site), by separately packaging silicon sol and dry shape evenly gather materials and weigh by proportioning, mix and stir after inserted in the blowpipe mould having assembled, use vibrating head jolt ramming.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210365011.0A CN103224401B (en) | 2012-09-27 | 2012-09-27 | Energy-efficient sol combined mullite castable used for blast furnace air supply branch pipe inner liner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210365011.0A CN103224401B (en) | 2012-09-27 | 2012-09-27 | Energy-efficient sol combined mullite castable used for blast furnace air supply branch pipe inner liner |
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| Publication Number | Publication Date |
|---|---|
| CN103224401A CN103224401A (en) | 2013-07-31 |
| CN103224401B true CN103224401B (en) | 2014-09-03 |
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| CN201210365011.0A Active CN103224401B (en) | 2012-09-27 | 2012-09-27 | Energy-efficient sol combined mullite castable used for blast furnace air supply branch pipe inner liner |
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| CN105859308B (en) * | 2016-03-30 | 2018-09-07 | 湖南湘钢瑞泰科技有限公司 | A kind of refractory material and tuyere combined brick |
| CN110526722A (en) * | 2019-09-02 | 2019-12-03 | 马鞍山利尔开元新材料有限公司 | A kind of moulding by casting high life corundum mullite rock collector nozzle of ladle brick and preparation method thereof |
| CN113666719A (en) * | 2020-05-13 | 2021-11-19 | 中冶建筑研究总院有限公司 | Quick-drying high-strength high-refractoriness under load castable for blast furnace tuyere and preparation method and application thereof |
| CN113636831B (en) * | 2021-09-15 | 2023-03-17 | 武汉钢铁有限公司 | Quick-drying hollow sphere heat-insulation refractory castable |
| CN113773095A (en) * | 2021-09-26 | 2021-12-10 | 海城利尔麦格西塔材料有限公司 | Blast furnace air supply branch pipe castable |
| CN116135815A (en) * | 2021-11-16 | 2023-05-19 | 宝武装备智能科技有限公司 | Lining castable for integral casting of blast furnace belly pipe |
| CN116924772A (en) * | 2022-03-31 | 2023-10-24 | 宝山钢铁股份有限公司 | Pouring material for ladle cover of bloom continuous casting tundish and construction method thereof |
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