CN102399088A - Taphole stemming used for oversize blast furnaces - Google Patents
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Abstract
Belonging to the technical field of refractory materials, the invention relates to taphole stemming used for oversize blast furnaces over 4500m<3>. The taphole stemming used for oversize blast furnaces comprises by weight: 25-50% of brown corundum, 5-20% of silicon carbide, 7-25% of ferro-silicon nitride, 15-30% of a composite carbon material, 5-15% of kaolin, 3-7% of composite refractory material micropowder, and 1-5% of composite metal powder. The stemming is prepared by the steps of: conducting weighing and burdening according to the above ratio of various raw materials, mixing them well and adding a coal tar binder accounting for 15-25% of the total weight of the additionally added dry materials, then conducting rolling and mulling so as to obtain a mud material. The stemming of the invention has good comprehensive performance, stable taphole depth, long tapping time, good erosion and scouring resistance, as well as good construction performance.
Description
Technical field
The present invention relates to a kind of 4500m
3More than super-huge blast furnace use the iron notch stemming, belong to technical field of refractory materials.
Background technology
Along with the maximization and longevityization of blast furnace, stemming turns to functional refractory materials from simple expendable refractory materials.Except botting and stable effect of tapping a blast furnace, increased the function in protection cupola well zone, so stemming is a kind of very important refractory materials in the iron-smelting process.Furnace volume is big more, and combustion intensity is high more, and is just high more to the requirement of stemming.
Present 5000m
3The super-huge blast furnace of level is more and more in China, and furnace pressure is big, and combustion intensity is high, the amount of tapping a blast furnace of every day have up to 12500 tons.Therefore the stemming of using must have better high temperature resistance molten iron, molten slag water eroding and flooding performance, and better resistance to elevated temperatures also will have good opening simultaneously and beat the mud performance.But blast furnace mud of the prior art often can not satisfy the various requirement of super-huge blast furnace.
Chinese patent CN 1673395A " the novel anhydrous stemming of blast furnace iron notch " provides a kind of blast furnace mud.This invention component is the percentage meter by weight: fused alumina 15～45%, burnt grain 10～40%, Guangxi mud 10～25%, silit 6～12%, sericite 5～9%, talcum powder 1～3%, micro crystal graphite 1～2%, compound additive 13～23%.Technical performance index is: the cold crushing strength 16.8MPa after the 1300 ℃ * 3h thermal treatment, apparent porosity 33%, volume density 1.96g/cm
3, line velocity of variation-1.06%.According to introducing this stemming at 1204m in the embodiment
3Effect is preferably arranged on the blast furnace.Technical indicator according to this stemming can't be used on the super-huge blast furnace with the use actual achievement.
The stemming that Chinese patent CN1523120A " anhydrous stemming for blast furnace " provides is formed (% by weight percentage): thick brown corundum 1～4%, thin brown corundum 2～5%, thick mullite 7～15%; Thin mullite 9～20%, coke powder 15～20%, clay 10～19%; Silit 7～11%; Sericite 5～8%, pitch 2～4%, carbolineum 15～25%.This patent is not mentioned the blast furnace instance of application, and the performance index of stemming are not provided yet.It is wedding agent that this stemming adopts carbolineum, but the volatilization component of carbolineum is more than tar, and fixed carbon content is well below tar.So adopt carbolineum can cause the compactness of stemming to reduce, intensity reduces, and makes the stemming degradation.
Summary of the invention
The object of the present invention is to provide a kind of super-huge blast furnace to use the iron notch stemming, this stemming has good comprehensive performances, and its intensity is high, and resistance to fouling and scour resistance are good, and resistance to elevated temperatures is good.
To achieve these goals, the present invention adopts following technical scheme:
A kind of super-huge blast furnace of the present invention is used the iron notch stemming, and its component percentage is by weight counted:
Palm fibre corundum 25～50%,
Silit 5～20%,
Ferro-silicon nitride 7～25%,
Composite carbon element material 15～30%,
Kaolin 5～15%,
Composite refractory micro mist 3～7%,
Composite metal powder 1～5%,
Each component sum is 100%; Above-mentioned various raw materials in described ratio weighing and burden, after mixing, are added the coal tar wedding agent again, and the add-on of said coal tar wedding agent rolls the formation pug that mixes for by said 15～25% of the siccative gross weight that adds after the adding.
Said ferro-silicon nitride is a synthesis material, contains 75%～80% Si in the said raw material
3N
4, 12%～17% Fe, all the other are impurity.
Said composite refractory micro mist comprises activated alumina micro mist and fine silica powder, and both ratios are 1:1.
Said composite carbon element material comprises coke powder, graphite, carbon black, and said composite carbon element material is one or both compound in coke powder and Graphite Powder 99 and the carbon black.
Said sooty particle diameter D
50=40nm.
Said metal powder is any one or two kinds of Pure Silicon Metal and metallic aluminium powder.
The raw material of stemming of the present invention is formed collocation rationally; Through adding composite refractory micro mist, composite metal powder, ferro-silicon nitride fine powder and composite carbon element material etc.; Make stemming have good comprehensive performances, the iron mouth degree of depth is stable, and the time of tapping a blast furnace is long; The anti-erosion performance of flushing is good, also has good construction performance.Compared with prior art, it has following advantage:
1) adds composite carbon element material, improved thermal shock resistance, antistrip performance, the anti-permeability performance of stemming.
2) added the alumina-silica composite micro-powder, at high temperature generated mullite, produced certain swell increment, not only can improve the hot strength of stemming, and increase the compactness of stemming, avoided cracking.
3) add composite metal powder, can promote the Fast Sintering of stemming, obviously improved the intensity of stemming.These metal powders also play oxidation resistant effect, can protect silit and carbon raw material in the stemming to a certain extent.
4) these have the integrated use of high anti-erosion, antiscour refractory raw material to have paid attention to corundum, silit, ferro-silicon nitride.The anti-molten iron of stemming, slag erosion and erosive performance are improved greatly, guaranteed tapping a blast furnace the time of stemming.
Embodiment
In the operation of blast-furnace smelting, the quality of iron notch state is the important factor that is related to operational stability, needs stable quality usually as the compaction material that constitutes iron notch.The erosion resistance of stemming changes with slag, molten iron temperature and composition and different, and abrasion resistance can be with furnace pressure, the speed of tapping a blast furnace and different.Making stemming possess good comprehensive performances needs stemming starting material utilizations rationally, and iron oral pore footpath does not sharply enlarge in the process of tapping a blast furnace, and can reduce the number of casts of stokehold, the amount of tapping a blast furnace that guarantees super-huge blast furnace with tap a blast furnace the time.
A kind of super-huge blast furnace of the present invention is used the iron notch stemming, and its component percentage is by weight counted:
Palm fibre corundum 25～50%,
Silit 5～20%,
Ferro-silicon nitride 7～25%,
Composite carbon element material 15～30%,
Kaolin 5～15%,
Composite refractory micro mist 3～7%,
Composite metal powder 1～5%,
Each component sum is 100%; With above-mentioned various raw materials in described ratio weighing and burden; After mixing; Add the coal tar wedding agent again, the add-on of said coal tar wedding agent rolls the formation pug that mixes for by said 15～25% of the siccative gross weight that adds after the adding; Pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
The super-huge blast furnace of the present invention specifies as follows with the component of iron notch stemming:
The palm fibre corundum, brown corundum densification is wear-resisting, volume density＞3.90g/cm
3, Mohs' hardness is 9 grades and is only second to diamond.The high temperature lower volume is stable, has the performance of fine high temperature resistance molten iron erosion and erosive wear.Add brown corundum raw material and account for 25～50% of total dosage weight.Palm fibre corundum raw material adds very little, and the intensity of stemming and high-temperature behavior are not good; If add too much, can influence the transaction capabilities of stemming, it is best that therefore brown corundum raw material adds 25～50% effects.
Silit, SiC have HMP (＞2200 ℃), and is high temperature resistant, anti-erosion, and HS, high-wear resistance (Mohs' hardness 9.2), linear expansivity is less, and the thermal conductivity advantages of higher is slag corrosion resistance, performance of flushing good raw material in stemming.The sic raw material that adds accounts for 5～20% of total dosage weight.
Ferro-silicon nitride, ferro-silicon nitride are the artificial-synthetic materials, contain 75%～80% Si in the common this raw material
3N
4, 12%～17% Fe, all the other are impurity.The application mechanism of ferro-silicon nitride in blast furnace mud is: through in the stemming raw material, adding ferro-silicon nitride, the reaction of silicon nitride and Fe and C takes place, consequently partly form SiC and AlN combination in matrix, strengthened matrix.And follow these reactions, produced N
2, CO gas, shedding of organic bond fugitive constituent quickened in the generation of these gases, it is more fine and close that stemming is organized, and played preventing that slag from invading, and reduced the friction effect with the molten iron contact surface.And Si
3N
4-Fe contains Si
3N
4The refractoriness of component is high, and erosion resistance is good, in stemming material, adds Si
3N
4-Fe is important measures that improve use properties.The ferro-silicon nitride raw material that adds accounts for the 7～25% proper of total dosage weight.
Composite carbon element material comprises coke powder, graphite, carbon black, and said composite carbon element material is one or both compound in coke powder and Graphite Powder 99 and the carbon black.It is that the coke powder is 70～90% that the composite carbon element material material is formed, graphite 0～25%, carbon black 0～15%, sooty particle diameter D
50=40nm.These carbon materialses are difficult to soak into to molten iron, slag, and acid and alkali alkali corrodes, with Al
2O
3, SiC, SiO
2Do not have congruent melting relation Deng element, thermal shock resistance, antistrip performance, the anti-permeability performance of stemming all is significantly improved.Add-on accounts for 15～30% of total dosage weight.Add-on can influence the adhesive property of stemming too much, is unfavorable for bringing into play it very little and strengthens the stemming erosion-resisting characteristics.
The composite refractory micro mist comprises activated alumina micro mist and titanium dioxide silicon powder, and both ratios are 1:1.As one of composition of matrix, play a part to strengthen matrix.SiO
2And Al
2O
3At high temperature can generate mullite, produce certain swell increment, not only can improve the hot strength of stemming, improve its erosion-resisting characteristics, and increase the compactness of stemming.Composite refractory micro mist add-on accounts for 3～7% of total dosage weight.
Kaolin, kaolin make stemming have flexibility and plasticity-, are convenient to extruding of stemming, play nodulizing, and make stemming that sintering strength arranged when middle temperature in high, middle temperature.The kaolin material quantity that adds accounts for 5～15% of total dosage weight.
Composite metal powder, the effect that adds metal powder is the Fast Sintering that promotes stemming, and can obviously improve the intensity of stemming.The metal powder that in stemming of the present invention, adds can be that any one or two kinds of Pure Silicon Metal and metallic aluminium powder add simultaneously.These metal powders also play oxidation resistant effect in addition, can protect silit and carbon raw material in the stemming to a certain extent, so add-on is 1～5%.
The wedding agent that stemming of the present invention adopts is a coal tar, and coal tar plays important effect as the wedding agent of stemming, makes stemming that good plasticity-arranged, and can form carbon in middle temperature and combine, and makes stemming under middle temperature, keep certain intensity.The add-on of said coal tar wedding agent is by said 15～25% (the adding) that add the siccative gross weight.
Above-mentioned various raw materials in described ratio weighing and burden, are mixed, roll the formation pug that mixes again behind the adding coal tar, pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
Embodiment 1:Prepare burden by following requirement:
The brown corundum raw material of 4～0mm, add-on accounts for 50% of total ingredients by weight;
The sic raw material of 3～0mm, add-on account for 5% of total ingredients by weight percentage ratio;
The composite carbon element material of 2～0mm, add-on account for 15% of total ingredients by weight percentage ratio; Wherein composite carbon element material consists of: coke powder 70%, graphite 15%, D
50The carbon black 15% of=40nm.
0.088 the ferro-silicon nitride raw material add-on of～0mm accounts for 11% of total ingredients by weight percentage ratio;
0.088 the kaolin raw material add-on of～0mm accounts for 15% of total ingredients by weight percentage ratio;
Composite refractory micro mist add-on less than 10 microns accounts for 3% of total ingredients by weight percentage ratio;
0.088 the add-on of～0mm metallic aluminium powder accounts for 1% of total ingredients by weight percentage ratio.
Above-mentioned various raw materials in described ratio weighing and burden, are mixed, add wedding agent coal tar again; Said coal tar add-on is pressed 15% of above-mentioned raw materials gross weight; Roll after the adding again and mix, pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
Stemming is carried out the test of physicals, and its technical indicator is: the volume density after 800 ℃ * 3h burns is 2.21g/cm
3, compressive strength is 11.5MPa, burning back line velocity of variation is-0.4%; Volume density after 1500 ℃ * 3h burns is 2.20g/cm
3,Compressive strength is 28.4MPa, and burning back line velocity of variation is-0.2%.
Embodiment 2:
Prepare burden by following requirement:
The brown corundum raw material of 4～0mm, add-on accounts for 35% of total ingredients by weight;
The sic raw material of 3～0mm, add-on account for 20% of total ingredients by weight percentage ratio;
The composite carbon element material of 2～0mm, add-on account for 20% of total ingredients by weight percentage ratio; Wherein composite carbon element material consists of: coke powder 90%, D
50The carbon black 10% of=40nm.
0.088 the ferro-silicon nitride raw material add-on of～0mm accounts for 7% of total ingredients by weight percentage ratio;
0.088 the kaolin raw material add-on of～0mm accounts for 10% of total ingredients by weight percentage ratio;
Composite refractory micro mist add-on less than 10 microns accounts for 5% of total ingredients by weight percentage ratio;
0.088～0mm metallic silicon power add-on accounts for 3% of total ingredients by weight percentage ratio.
Above-mentioned various raw materials in described ratio weighing and burden, are mixed, add wedding agent coal tar again; Said coal tar add-on is pressed 20% of above-mentioned raw materials gross weight; Roll after the adding again and mix, pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
Stemming is carried out the test of physicals, and its technical indicator is: the volume density after 800 ℃ * 3h burns is 2.17g/cm
3, compressive strength is 10.7MPa, burning back line velocity of variation is-0.4%; Volume density after 1500 ℃ * 3h burns is 2.15g/cm
3,Compressive strength is 27.1MPa, and burning back line velocity of variation is-0.2%.
Embodiment 3:
Prepare burden by following requirement:
The brown corundum raw material of 4～0mm, add-on accounts for 25% of total ingredients by weight;
The sic raw material of 3～0mm, add-on account for 8% of total ingredients by weight percentage ratio;
The composite carbon element material of 2～0mm, add-on account for 30% of total ingredients by weight percentage ratio; Wherein composite carbon element material consists of: coke powder 75%, graphite 25%.
0.088 the ferro-silicon nitride raw material add-on of～0mm accounts for 20% of total ingredients by weight percentage ratio;
0.088 the kaolin raw material add-on of～0mm accounts for 5% of total ingredients by weight percentage ratio;
Composite refractory micro mist add-on less than 10 microns accounts for 7% of total ingredients by weight percentage ratio;
0.088～0mm composite metal powder add-on accounts for 5% of total ingredients by weight percentage ratio, wherein the metallic aluminium powder add-on accounts for 2% of total ingredients by weight percentage ratio, and the Pure Silicon Metal add-on accounts for 3% of total ingredients by weight percentage ratio.
Above-mentioned various raw materials in described ratio weighing and burden, are mixed, add wedding agent coal tar again; Said coal tar add-on is pressed 25% of above-mentioned raw materials gross weight; Roll after the adding again and mix, pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
Stemming is carried out the test of physicals, and its technical indicator is: the volume density after 800 ℃ * 3h burns is 2.08g/cm
3, compressive strength is 12.5MPa, burning back line velocity of variation is-0.5%; Volume density after 1500 ℃ * 3h burns is 2.05g/cm
3,Compressive strength is 29.3MPa, and burning back line velocity of variation is-0.1%.
Embodiment 4:
Prepare burden by following requirement:
The brown corundum raw material of 4～0mm, add-on accounts for 27% of total ingredients by weight;
The sic raw material of 3～0mm, add-on account for 10% of total ingredients by weight percentage ratio;
The composite carbon element material of 2～0mm, add-on account for 25% of total ingredients by weight percentage ratio; Wherein composite carbon element material consists of: coke powder 85%, graphite 10%, D
50The carbon black 5% of=40nm;
0.088 the ferro-silicon nitride raw material add-on of～0mm accounts for 25% of total ingredients by weight percentage ratio;
0.088 the kaolin raw material add-on of～0mm accounts for 7% of total ingredients by weight percentage ratio;
Composite refractory micro mist add-on less than 10 microns accounts for 4% of total ingredients by weight percentage ratio;
0.088～0mm composite metal powder add-on accounts for 2% of total ingredients by weight percentage ratio, wherein the metallic aluminium powder add-on accounts for 1% of total ingredients by weight percentage ratio, and the Pure Silicon Metal add-on accounts for 1% of total ingredients by weight percentage ratio.
Above-mentioned various raw materials in described ratio weighing and burden, are mixed, add wedding agent coal tar again; Said coal tar add-on is pressed 22% of above-mentioned raw materials gross weight; Roll after the adding again and mix, pug can be used in the production scene after 3 days after packing through the mud extruder extrusion molding.
Stemming is carried out the test of physicals, and its technical indicator is: the volume density after 800 ℃ * 3h burns is 2.11g/cm
3, compressive strength is 13.1MPa, burning back line velocity of variation is-0.5%; Volume density after 1500 ℃ * 3h burns is 2.07g/cm
3,Compressive strength is 29.9MPa, and burning back line velocity of variation is-0.3%.
More than 4 embodiment because raw-material combination is scientific and reasonable, and the plasticity-of the stemming of being made is all very good, the technical indicator that sample preparation is measured all is higher than the performance index of prior art stemming; Especially stemming of the present invention burns back intensity height; Linear shrinkage after the burning is also very little, can make stemming that the good high-temperature volume stability is arranged, and the antiscour polishing machine is good; Help keeping the stable of iron mouth, can adapt to the needs of super-huge blast furnace casting.
More than being merely preferred embodiment of the present invention, is not the protection domain that is used to limit invention, therefore, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a super-huge blast furnace is used the iron notch stemming, it is characterized in that: the component of said stemming percentage is by weight counted:
Palm fibre corundum 25～50%,
Silit 5～20%,
Ferro-silicon nitride 7～25%,
Composite carbon element material 15～30%,
Kaolin 5～15%,
Composite refractory micro mist 3～7%,
Composite metal powder 1～5%,
Each component sum is 100%; Above-mentioned various raw materials in described ratio weighing and burden, after mixing, are added the coal tar wedding agent again, and the add-on of said coal tar wedding agent rolls the formation pug that mixes for by said 15～25% of the siccative gross weight that adds after the adding.
2. super-huge blast furnace according to claim 1 is used the iron notch stemming, it is characterized in that: said ferro-silicon nitride is a synthesis material, contains 75%～80% Si in the said raw material
3N
4, 12%～17% Fe, all the other are impurity.
3. super-huge blast furnace according to claim 1 is used the iron notch stemming, it is characterized in that: said composite refractory micro mist comprises activated alumina micro mist and titanium dioxide silicon powder, and both ratios are 1:1.
4. super-huge blast furnace according to claim 1 is used the iron notch stemming, it is characterized in that: said composite carbon element material comprises coke powder, graphite, carbon black, and said composite carbon element material is one or both compound in coke powder and Graphite Powder 99 and the carbon black.
5. super-huge blast furnace according to claim 4 is used the iron notch stemming, it is characterized in that: said sooty particle diameter D
50=40nm.
6. super-huge blast furnace according to claim 1 is used the iron notch stemming, it is characterized in that: said metal powder is any one or two kinds of Pure Silicon Metal and metallic aluminium powder.
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| CN102775165A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Blast furnace tapping channel castable |
| CN102775166A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Blast furnace main iron channel castable |
| CN102775169A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Preparation method of blast furnace main iron channel |
| CN102874793A (en) * | 2012-10-23 | 2013-01-16 | 湖南省宁乡县长宁炭素制品有限公司 | Production method of novel battery carbon rods |
| CN103360096A (en) * | 2013-07-31 | 2013-10-23 | 武汉钢铁(集团)公司 | Tap hole stemming for large-scale blast furnace and preparation method |
| CN103396136A (en) * | 2013-07-31 | 2013-11-20 | 武汉钢铁(集团)公司 | Stemming for super-huge type blast furnace and preparation method thereof |
| CN103804000A (en) * | 2014-02-19 | 2014-05-21 | 长兴云峰炉料有限公司 | Compact high strength SiAlON combined iron runner castable and manufacture method thereof |
| CN106699206A (en) * | 2016-12-26 | 2017-05-24 | 中国京冶工程技术有限公司 | Anhydrous stemming for large and medium sized blast furnace and preparation method of anhydrous stemming |
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| CN108585901A (en) * | 2018-06-19 | 2018-09-28 | 佘春霞 | A kind of blast furnace iron notch reparation mud |
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| CN102775165A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Blast furnace tapping channel castable |
| CN102775166A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Blast furnace main iron channel castable |
| CN102775169A (en) * | 2012-07-30 | 2012-11-14 | 浙江锦诚耐火材料有限公司 | Preparation method of blast furnace main iron channel |
| CN102874793A (en) * | 2012-10-23 | 2013-01-16 | 湖南省宁乡县长宁炭素制品有限公司 | Production method of novel battery carbon rods |
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Application publication date: 20120404 |