Iron channel is pouring makings

The article puts forward to use those who improved explosion proof performance is fireproof and pouring makings whole is pouring channel of taphole of blast furnace of odd iron mouth, and at the same time taphole advocate channel is transformed for construction of Chu Tie type. Practice of channel of iron of 450m3 blast furnace makes clear, the iron channel after transforming uses 69 days continuously without repairing, taphole 120 thousand tons. Front row second repair last a period of time 12 hours, roast time is controlled 1 hour. The result shows this technology can prolong life of channel of iron of blast furnace of odd iron mouth substantially, blast furnace of mouth of odd iron of complete change gives the working environment of ironworks. This technology applies what Yu Chao pounds forge iron channel 50 times too already successfully to transform.

1 preface
Channel of taphole of contemporary and large blast furnace is to use low cement to combine Al2O3 –SiC –C to pledge commonly pouring makings. This material uses security, life is long, use up little, construction maintenance is convenient, it is blast furnace is produced firmly, of natural labor important assure. Because use up little, maintenance is little, use stability, accordingly, environment of field of the taphole before furnace of contemporary big blast furnace is neat, do not have the foul atomsphere of field of the taphole before furnace of small blast furnace and disorder to be able to 't bear absolutely.
General big blast furnace has the taphole channel of 2 above, when because this is become,be being repaired among them, should stem only after the taphole of this iron channel, can undertake pouring, conserve to this iron channel roast and sclerotic, dry etc. Meanwhile, other taphole taphole is normal, do not affect the normal production of blast furnace.
But cubage is 1000m3 the following medium or small blast furnace is designed commonly for individual taphole, because this assures impossibly general and pouring the conserve that makings construction place needs, roast time. So, the channel of iron of medium, small-sized blast furnace of current odd taphole still uses pitch commonly or colophony union Al2O3 –SiC –C is avoided character roast pound dozen of makings to pound liner of forge iron channel.
Because use colophony or tar band, after pounding dozen of makings to pound dozen of construction, do not want roast or increase short time slightly roast can cross molten iron directly instantly, the use craft of OK and contented medium, small blast furnace asks. But because pound hit channel line,fireproof material is channel bottom surface only commonly relatively close-grained, and channel is reached to help place under surface layer very loose, do not be able to bear or endure erode, because this beats dozen of issue that expects existence service life is too brief, have 1 ～ 7 days only commonly, short even 1 is repaired. In the meantime, because pound forge iron channel,be drought channel structure, iron of every one furnace clears the much damage iron that the solidify inside channel comes down is residual, after clearing at the same time, the shop scatters Huang Sha or anxious pink.
Accordingly, the cleek before pounding dozen of makings to pound the oven of blast furnace of odd iron mouth that make safeguards a worker labor strength is too great, and the environment of high fever causes a lot of insecure elements again, still have bitumen and resinous soot poisonous and harmful problem!
Because how this solves the problem of life of channel of taphole of blast furnace of odd iron mouth effectively,get attention fully.
My company ever developed the colophony that can carbonado quickly forcedly quickly to combine Al2O3 –SiC –C to pledge for this pouring makings (patent: Iron channel is avoided roast and pouring makings and channel of taphole of blast furnace of odd iron mouth are pouring makings the craft that make line, patent date 2006100869258) , replace pound dozen of makings to solve channel of taphole of blast furnace of odd iron mouth the problem with brief service life, undertook applied in a few blast furnace. Although this technology solved the close-grained sex problem of construction system, but this kind pouring because makings basically is colophony union, colophony dosage is opposite bigger, of colophony oneself after burning, cause loose after burning pouring system structure is loose, of iron channel fight erode fight erode ability still has it seems that defective, service life is far the Al2O3-SiC-C of low cement union that uses as place of big blast furnace is qualitative pouring makings. And colophony union is pouring makings in roast when because colophony soot creates the environment before furnace,abominable problem still is.
On summary experience and the foundation of a large number of experiments, my company combines Al2O3 –SiC –C through using low cement to large blast furnace qualitative iron channel is pouring makings undertake modified, make its can be in hot condition issues construction and can warm up quickly and not dissilient, the fast construction that satisfies channel of iron of blast furnace of mouth of iron of medium, small-sized sheet uses a requirement.
In project practice, we still draw lessons from big blast furnace advocate the structure of Chu Tie type that iron channel uses generally, taphole of blast furnace of mouth of iron of will medium, small-sized sheet advocate channel also transforms Chu Tie type or construction of half Chu Tie type, improve the agglomeration environment of fireproof material and urgent cold urgent hot environment thereby. Before this kind of structure also cancelled furnace of small blast furnace be in before taphole every time advocate the rule that the shop inside channel drops Huang Sha or anxious pink, changed the working environment of platform of the work before furnace thoroughly thereby.
Al2O3–SiC–C of union of 2 low cement is qualitative pouring the modified research of makings
Big blast furnace pledges with Al2O3–SiC–C of low cement union pouring have in makings burden exceed small pink and dispersive agent, because this fluidity is good, fireproof,spend tall, pouring system is compact quality good, intensity is high, because this iron channel is fought,erode, fight erode, service life is long (the volume that connect iron is high) . But the big question of this material is pouring hind need conserve and cannot spend quickly too roast, can appear otherwise intensity is too low with explosive blowout accident. Because this solves channel of iron of big blast furnace effectively pouring the wash-and-wear drawing of patterns of makings and fast and roast, avoid explosive blowout problem, it is this material whether the key that is used at blast furnace of odd iron mouth, also be the main attack direction of this research.
Pouring the vapor that expects because be formed quickly,roast craze and dissilient and main reason are cannot seasonable eduction is pouring outside body, pouring the vapor inside body is pressed too tall. Pouring when body is roast, pouring because be heated is rapid,the water inside makings is met aerification. The relation of the evaporate steam pressure of water and temperature is shown 1 times like the graph. In the relation of the vapour pressure from water and temperature see not hard, water is when 100 ℃ above, vapour pressure force is swift and violent rise.
The main train of thought of this experiment is: Be pledge with Al2O3–SiC–C with large blast furnace iron channel is pouring makings for the foundation, join material of all sorts of explosion proof modified, make its have the property of fast hard explosion proof. Method of explosion proof experiment is will pouring makings is pouring the diamonds that is 100×100×60mm, pouring hind 1 ～ 2h namely drawing of patterns will be put instantly warm up beforehand and in the electric stove of constant temperature, after 30min of the heat preservation inside high temperature furnace, observation its dissilient degree. Experiment of farther enlarge appearance is will pouring makings is pouring those who be 100Kg above is prefab piece, it is pouring likewise hind 1 ～ 2h undertakes on the charcoal fire that drawing of patterns puts in 1000 ℃ to control instantly namely roast, examine its blowout circumstance.
2.1 add aid bond to adjust curing time
Pouring of makings fast hard fast to construction hind drawing of patterns is crucial, this case helps bond forcedly through joining hurried, assure pouring makings have enough construction time already, still be in at the same time pouring after shaping very fast sclerosis, so that seasonable drawing of patterns undertakes roast.
Research returns discovery, pouring the curing time of makings is returned with pouring of body bouffant have very big concern with blowout. Pouring makings is too fast sclerosis and too slow sclerosis, can give cast-in-place note put oneself in another's position bouffant the problem with blowout. Accordingly, help bond right amountly through joining, can effective control is pouring the curing time of makings, keep abreast of and prevent gas evolution those who bring is bouffant with crackle. Add have gas evolution agent and those who help bond is pouring makings about 1h namely can solidify drawing of patterns, the appearance after solidify piece put 450 ℃ directly blowout also won't happen inside furnace.
2.2 join gas evolution the agent is improved put explode function
Metallic Al pink can react with water generation H2 is enraged, because this is pouring it is OK that a few Al whites are joined in makings in pouring hind produce many gas passage, of the vapor in be helpful for roast process diffuse. The process that at the same time Al pink and water react still can produce much quantity of heat, can promote effectively pouring the sclerosis of makings. But metallic Al pink adds a quantity to spend a long time, because gas evolution is too much, pouring body is easy produce bouffant craze, bring about structural intensity to reduce.
What gas evolution follows metallic Al pink is fineness concern with the amount, the granuality of Al pink is finer the amount is more, as gas evolution as water reaction Shaoxing opera intense, produce tolerance to jump over concentration more more, produce bouffant craze more easily, affect bulk density, reduce intensity. So, what control metallic Al pink strictly is fineness with add a capacity.
Of the pink that divide Al besides, this case still is in pouring added in makings organic and gas evolution agent. Organic and gas evolution of the agent gas evolution mechanism is gas evolution agent and cement decompose reaction with water happening, make some kind of calcic salt, calcic salinity solution produces N2, CO2, NH3 to enrage. As a result of organic and gas evolution pink of agent unlike Al reacts in that way acuteness, because this is pouring makings is not easy appear bouffant the problem with fine pink rise. And organic and gas evolution the medicine won't come into being because of the difference of temperature of construction conserve environment gas evolution the very big change of speed and gas evolution, accordingly construction masters more easily. 2.3 add organic fiber to raise antiknock to crack a gender
Adding explosion proof fiber is pouring material is effective one of explosion proof measure. The principle of fiber explosion proof is pouring the fiber after makings be heated contracts quickly or decompose, be in at the same time pouring stomatic channel is formed in makings, let thereby pouring the vapor of makings because of be heated generation diffuses quickly brandish is given out. Pouring the vapor inside makings diffuses in time to go out and be absent pouring the assemble inside body forms greater pressure, pouring body won't produce blowout.
But fiber breed is numerous, reasonable choice breed, diameter, length and dosage are right pouring of makings put explode the effect is crucial.
This research carries reasonable option, be in pouring after the fiber that proper breed and amount add in makings, after the sample after sclerosis is put into the heat preservation inside the high temperature furnace of 500 ℃ directly, sample face is whole, won't produce blowout.
2.4 add agent of explosion proof of alkaline type emulsion
Agent of explosion proof of alkaline type emulsion is agent of a kind of when just see report in last few years new-style explosion proof, its constitute matter of becomes for the ionic polymerization of hydroxide much nucleus complexing, can effective deliquescent Yu Shuirong fluid. Document introduces mechanism of its explosion proof to be: Pouring expect when be heated is dry, the dehydration gel of alkaline type emulsion is in matrix web piece shape micro-crack passageway, increased thereby pouring of makings breathe freely rate. Occupy those who weighed alkaline type to emulsion can be restrained or defer CAH10 additionally to generate, also can rise pouring the explosion proof of makings cracks temperature.
To rise further pouring of makings put explode the effect, this case undertook applied study to agent of explosion proof of alkaline type emulsion, match research through dosage, will pouring makings antiknock cracks temperature from temperature of original safe explosion proof 500 ℃ raise 800 ℃ , make wash-and-wear explosion proof pouring makings had safer performance characteristics.
Annals of fireproof data limited company is in furnace of kiln of Zhengzhou Rong Cheng industrial dedicate oneself to the service of one's motherland, industry of service high temperature is oneself, we bear tens of year the technology is accumulated, active and before look up ground is high temperature industry will make tomorrow make brand-newly, become hard " boiler and expert of liner of furnace of hot project kiln " .