CN101967062A - Anhydrous stemming for blast-furnace tapping hole - Google Patents

Abstract

The invention discloses an anhydrous stemming for a blast-furnace tapping hole. Tar oil with specific weight of 1.15-1.16 or mixed oil of tar oil and anthracene oil is used as a binding agent, more than 50% of coarse and middle particles are added into a particle composition of the formulation, the content of fine powder with the particle size not more than 0.088 mm is controlled below 50%, a great amount of sericite is added into the formulation, and 40-70 mesh refined quartz sand is added. The stemming has good air permeability and rapid sintering performance and can be rapidly hardened within 20-30 min, the gas can be exhausted through ventilation holes, the strength of the stemming can be rapidly increased within short time and can satisfy about 30 min continuous opening tapping of single tapping holes of large and medium blast furnaces.

Description

No-water stemming material for blast furnace taphole

Affiliated technical field

The invention belongs to refractory materials, particularly relate to a kind of anhydrous stemming prescription and production technique thereof that is applicable to that the big-and-middle-sized blast furnace iron notch of steelworks is used.

Background technology

At present, the big-and-middle-sized blast furnace of steelworks all has 2～4 iron notchs (claiming the iron mouth again), all is that two iron notchs alternately tap a blast furnace generally speaking.But some in particular cases (clay gun or the taphole drilling machine as certain iron notch breaks down, casting house need be poured into a mould or maintenance and some other situation) need or can only use single iron notch continuous tapping and can not alternately tap a blast furnace by a plurality of iron notchs, needed stemming performance was different fully when needed so in this case stemming performance and a plurality of iron notch alternately tapped a blast furnace.During list iron mouth continuous tapping, obviously shorten the pitch time of tapping a blast furnace of same iron notch, have only about 30 minutes, the sintering time of stemming also shortens certainly thereupon, it is bad (when two iron notchs alternately tap a blast furnace to use general normal stemming the stemming sintering will occur, tapping a blast furnace at interval of same iron notch generally more than 90～120 minutes, general stemming need obtain higher intensity at just possible sintering of so long time), intensity is on the low side, even the phenomenon of Chao Tiekou appears, can't satisfy the requirement of normally tapping a blast furnace, therefore need the stemming that a kind of Fast Sintering also of can hardening rapidly obtains sufficient intensity about 30 minutes, adapt to the mode of production of this single iron notch continuous tapping.

Chinese patent application numbers 200910065275 discloses a kind of " being used for environment-friendly type stemming of blast furnace iron notch and preparation method thereof ", by particle diameter 0.2～3 ㎜ alumine or flint clay or fused alumina 35%～50%, modified powder resin 1%～5%, hard pitch 1%～5%, inorganic phosphate 3%～8%, silicon carbide 1%～20%, coke powder 10%～20%, sericite 3%～10%, kyanite 2%～8% and tar 3%～8% are formed.To add the heated and stirred machine by the various raw materials that prescription takes by weighing and mix, and mix the back and adopt friction press compression moulding.This stemming has reduced the tar add-on owing to taked inorganic bonding agent to combine with organic bond, can reduce benzopyrene content in the stemming really, helps environmental protection.But the powdex of its adding and inorganic salt all need just can obtain higher intensity under the high bake more than 60 minutes, and adopt mechanical pressing, plasticity is poor, reduce ventilation property greatly, be unfavorable for the discharge of fugitive constituent, be not suitable for big-and-middle-sized blast furnace list iron mouth continuous tapping.Other prior aries adopt high-purity artificial-synthetic material mostly, these raw materials will obtain very high strength, must form ceramic post sintering through the long period, in big many iron of blast furnace mouth alternately taps a blast furnace process, long with iron mouth time pitch time, reach more than 120 minutes, can access enough intensity through so long time sintering.But iff through about 30 minutes sintering, opening at once just, then intensity is not come up, and is difficult to tackle washing away of long-time slag iron.

Summary of the invention

The present invention aims to provide a kind of no-water stemming material for blast furnace taphole, this kind stemming has air permeability and good and Fast Sintering performance, can in 20～30 minutes, harden rapidly, gas also can be discharged via breather hole, and stemming intensity can be brought up to rapidly in 30 minutes and can satisfy the intensity that the big-and-middle-sized blast furnace list iron continuous long period of mouth taps a blast furnace.

The technical solution adopted for the present invention to solve the technical problems is:

No-water stemming material for blast furnace taphole, raw material are formed weight percent and are:

Coke 2～0 ㎜ 15%～17%

Palm fibre corundum (perhaps superfine high aluminium material) 3～1 ㎜ 5%～12%

Palm fibre corundum (perhaps superfine high aluminium material) 1～0 ㎜ 5%～12%

Palm fibre corundum≤0.088 ㎜ 0%～10%

Silicon carbide (90# or 94#) 1～0 ㎜ 8%～12%

Silicon carbide (90# or 94#)≤0.088 ㎜ 8%～12%

Guangxi clay≤0.088 ㎜ 16%～20%

Hard pitch≤0.088 ㎜ 6%～10%

Sericite≤0.088 ㎜ 10%～12%

Refining quartz sand 40～70 orders 9%～11%

Resin (liquid) 3%～5%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 8%～15%

Production craft step is: weighing is good in proportion with above-mentioned solid powder, pours into to do in the heating-type mixing pan and mixes 3 ~ 6 minutes; Add liquid wedding agent (add resin earlier, and then add tar or mixing oil), mixed grind 35 ~ 45 minutes; Get pug and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value; Blowing squeezes mud by mud extruder, puts foil-type plastic bag, comes into operation after placing at least 48 hours under the natural ventilation state.

Described use proportion is that the mixing oil (moisture is not more than 2%) of 1.15～1.16 tar or tar and carbolineum is as wedding agent, in prescription, add the thick middle particle more than 50%, the fine powder content of particle diameter≤0.088 ㎜ is controlled at below 50%, the sericite of adding 10% in prescription adds the refining quartz sand of 40～70 purposes.

Invention mechanism:

Use density to be lower than the mixing oil (moisture requirement is not more than 1.5%) of the tar of 1.16g/ ml or tar and carbolineum as wedding agent.The molecular weight of polymkeric substance is little in this wedding agent, be easy to carburizing sintering, and the temperature of carburizing sintering is lower than the carbonization temperature of high polymer, and the wedding agent in the stemming can be once touching the fast coking carbonization of slag iron like this, thereby obtain a higher initial strength.

Add particle in thick 50% or more in the grain composition of prescription, the fine powder content of particle diameter≤0.088 ㎜ is controlled at below 50%, thereby obtains ventilation property preferably, the various volatile matters that stemming produces in sintering process can both obtain discharge.

The sericite that in prescription, adds more amount.Add the content of the sericite of more amount with low melting points such as the potassium in the increase stemming, sodium, make stemming in sintering process, can form more glassy phase, thereby reduce the sintering temperature of stemming, make be positioned at iron notch outwards the stemming of a part can be under temperature more on the low side also can sintering, thereby obtain doing the intensity that needs.

Add the refining quartz sand of 40～70 purposes.Because materials such as clay, sericite can produce volumetric shrinkage in sintering process, in order to keep the volume stability of stemming, quartz sand at high temperature with stemming in alumina composition react, generate mullite, obtain quite high intensity, follow volumetric expansion simultaneously, the contraction of counteracting clay etc.

The used raw material of the present invention comprise brown corundum (particle diameter 3～1 ㎜, 1～0 ㎜ and≤0.088 ㎜, wherein require Al2O3 〉=94%), superfine high aluminium material (Al2O3 〉=85%, particle diameter 3～1 ㎜ and 1～0 ㎜), coke (2～0 ㎜, fixed carbon 〉=84%), silicon carbide (the particle diameter specification of SiC 〉=90% and SiC 〉=94% is for being respectively 1～0 ㎜ and≤0.088 ㎜), Guangxi clay (particle diameter≤0.088 ㎜), (softening temperature is higher than 110 ℃ to hard pitch, particle diameter≤0.088 ㎜), sericite (particle diameter≤0.088 ㎜), refining quartz sand (40～70 orders, SiO ₂〉=98.5%), (viscosity is 20～50Pa.S to resin, carbon residue 〉=45%.Solid content 〉=78%), carbolineum, tar (ash content≤0.15%).If tar density is lower than 1.16g/ ml, then this tar can directly use, if tar density is greater than 1.16 g/ ml, and, this just needs to add some carbolineums, and stirs, and proportion is reduced to 1.15～1.16g/ml.Resin, carbolineum and tar all require moisture≤1.5%, other diffusing shape ingredient requirement moisture≤1%.

The invention has the beneficial effects as follows, stemming intensity can be brought up to the intensity that needs rapidly in 30 minutes, volume keeps basicly stable in the whole process of stemming after throwing the iron notch duct into, can satisfy therefore about 30 minutes continuously that opening taps a blast furnace, and has the sufficient intensity that the long period taps a blast furnace.

Embodiment

Embodiment one:

(1) take by weighing raw material by following proportioning:

Coke 2～0 ㎜ 16%

Superfine high aluminium material 3～1 ㎜ 10%

Superfine high aluminium material 1～0 ㎜ 5%

Palm fibre corundum≤0.088 ㎜ 5%

Silicon carbide (90#) 1～0 ㎜ 10%

Silicon carbide (90#)≤0.088 ㎜ 10%

Guangxi clay≤0.088 ㎜ 16%

Hard pitch≤0.088 ㎜ 8%

Sericite≤0.088 ㎜ 10%

Refining quartz sand 40～70 orders 10%

Resin (liquid) 3%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 13%

(2) weighing is good in proportion with above-mentioned solid powder, pour into then to do in the heating-type mixing pan and mixed 5 minutes, add liquid wedding agent (add resin earlier, and then add tar or mixing oil) then, mixed grind 40 minutes, get pug then and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value, blowing squeezes mud, puts foil-type plastic bag, can come into operation after placing at least 48 hours under the natural ventilation state by mud extruder then.

Embodiment two:

(1) take by weighing raw material by following proportioning:

Coke 2～0 ㎜ 16%

Superfine high aluminium material 3～1 ㎜ 10%

Palm fibre corundum 1～0 ㎜ 5%

Palm fibre corundum≤0.088 ㎜ 5%

Silicon carbide (90#) 1～0 ㎜ 10%

Silicon carbide (90#)≤0.088 ㎜ 10%

Guangxi clay≤0.088 ㎜ 16%

Hard pitch≤0.088 ㎜ 8%

Sericite≤0.088 ㎜ 10%

Refining quartz sand 40～70 orders 10%

Resin (liquid) 3%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 13%

(2) weighing is good in proportion with above-mentioned solid powder, pour into then to do in the heating-type mixing pan and mixed 5 minutes, add the liquid wedding agent then and (add resin earlier, and then adding tar or mixing oil), mixed grind 40 minutes (rotating speed is 14 rev/mins), get pug then and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increase oil, reduce to below the 1MPa until horse summer value, blowing squeezes mud, puts foil-type plastic bag, can come into operation after placing at least 48 hours under the natural ventilation state by mud extruder then.

Embodiment three:

(1) take by weighing raw material by following proportioning:

Coke 2～0 ㎜ 16%

Palm fibre corundum 3～1 ㎜ 10%

Palm fibre corundum 1～0 ㎜ 5%

Palm fibre corundum≤0.088 ㎜ 5%

Silicon carbide (90#) 1～0 ㎜ 10%

Silicon carbide (94#)≤0.088 ㎜ 10%

Guangxi clay≤0.088 ㎜ 16%

Hard pitch≤0.088 ㎜ 8%

Sericite≤0.088 ㎜ 10%

Refining quartz sand 40～70 orders 10%

Resin (liquid) 3%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 12%

(2) weighing is good in proportion with above-mentioned solid powder, pour into then to do in the heating-type mixing pan and mixed 5 minutes, add liquid wedding agent (add resin earlier, and then add tar or mixing oil) then, mixed grind 40 minutes, get pug then and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value, blowing squeezes mud, puts foil-type plastic bag, can come into operation after placing at least 48 hours under the natural ventilation state by mud extruder then.

Embodiment four:

(1) take by weighing raw material by following proportioning:

Coke 2～0 ㎜ 16%

Palm fibre corundum 3 ~ 1 ㎜ 10%

Palm fibre corundum 1 ~ 0 ㎜ 5%

Palm fibre corundum≤0.088 ㎜ 5%

Silicon carbide (94#) 1 ~ 0 ㎜ 10%

Silicon carbide (94#)≤0.088 ㎜ 10%

Guangxi clay≤0.088 ㎜ 16%

Hard pitch≤0.088 ㎜ 8%

Sericite≤0.088 ㎜ 10%

Refining quartz sand 40-70 order 10%

Resin (liquid) 4%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 11%

(2) weighing is good in proportion with above-mentioned solid powder, pour into then to do in the heating-type mixing pan and mixed 5 minutes, add liquid wedding agent (add resin earlier, and then add tar or mixing oil) then, mixed grind 40 minutes, get pug then and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value, blowing squeezes mud, puts foil-type plastic bag, can come into operation after placing at least 48 hours under the natural ventilation state by mud extruder then.

Embodiment five:

(1) take by weighing raw material by following proportioning:

Coke 2～0 ㎜ 16%

Palm fibre corundum 3～1 ㎜ 10%

Palm fibre corundum 1～0 ㎜ 10%

Silicon carbide (94#) 1～0 ㎜ 10%

Silicon carbide (94#)≤0.088 ㎜ 10%

Guangxi clay≤0.088 ㎜ 16%

Hard pitch≤0.088 ㎜ 8%

Sericite≤0.088 ㎜ 10%

Refining quartz sand 40～70 orders 10%

Resin (liquid) 5%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 10%

(3) weighing is good in proportion with above-mentioned solid powder, pour into then to do in the heating-type mixing pan and mixed 5 minutes, add liquid wedding agent (add resin earlier, and then add tar or mixing oil) then, mixed grind 40 minutes, get pug then and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value, blowing squeezes mud, puts foil-type plastic bag, can come into operation after placing at least 48 hours under the natural ventilation state by mud extruder then.

Above example is life-time service on 1080 cubic metres of blast furnaces of certain iron and steel enterprise, 1250 cubic metres of blast furnaces of certain iron and steel enterprise, certain 1800 cubic metres of blast furnace of large-scale iron and steel enterprise, 2580 cubic metres of blast furnaces once, effect is better, opening does not have moisture and wattenshlick, the iron notch degree of depth is stable, reach 2.7m～3.4m, the time of tapping a blast furnace is stabilized in 60～70 minutes respectively, 60～80 minutes, 80～100 minutes, more than 100 minutes.

Claims (1)

1. waterless taphole mix for blast furnace taphole is characterized in that:

Raw material is formed weight percent:

Coke 2～0 ㎜ 15%～17%

Palm fibre corundum (perhaps superfine high aluminium material) 3～1 ㎜ 5%～12%

Palm fibre corundum (perhaps superfine high aluminium material) 1～0 ㎜ 5%～12%

Palm fibre corundum≤0.088 ㎜ 0%～10%

Silicon carbide (90# or 94#) 1～0 ㎜ 8%～12%

Silicon carbide (90# or 94#)≤0.088 ㎜ 8%～12%

Guangxi clay≤0.088 ㎜ 16%～20%

Hard pitch≤0.088 ㎜ 6%～10%

Sericite≤0.088 ㎜ 10%～12%

Refining quartz sand 40～70 orders 9%～11%

Resin (liquid) 3%～5%

Tar (tar mixes with carbolineum) proportion 1.15～1.16 8%～15%

Production craft step is: weighing is good in proportion with above-mentioned solid powder, pours into to do in the heating-type mixing pan and mixes 3 ~ 6 minutes; Add liquid wedding agent (add resin earlier, and then add tar or mixing oil), mixed grind 35 ~ 45 minutes; Get pug and do horse summer value, the Ruo Maxia value is higher than 1MPa, then suitably increases oil, reduces to below the 1MPa until horse summer value; Blowing squeezes mud by mud extruder, puts foil-type plastic bag, comes into operation after placing at least 48 hours under the natural ventilation state.