CN104531938A - Method for applying slag pressing agent produced by blast furnace gun mud to converter steelmaking - Google Patents
Method for applying slag pressing agent produced by blast furnace gun mud to converter steelmaking Download PDFInfo
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- CN104531938A CN104531938A CN201410789196.7A CN201410789196A CN104531938A CN 104531938 A CN104531938 A CN 104531938A CN 201410789196 A CN201410789196 A CN 201410789196A CN 104531938 A CN104531938 A CN 104531938A
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- converter
- slag
- blast furnace
- powder
- ball
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Abstract
The invention discloses a method for applying a slag pressing agent produced by blast furnace gun mud to converter steelmaking. The method comprises the following steps: firstly crushing waste blast furnace gun mud into powder particles with particle size being smaller than 1mm by using a cone crusher or a raymond mill, selecting can delivering limestone powder with particle size being smaller than 1mm to a ball-pressing production line for later use; adding the gun mud powder and the limestone powder into a stirrer according to a mass ratio of 95 to 5, uniformly stirring and mixing by using a circulation operation manner, wherein the total weight of the materials added at each time is 5 tons, and the time only used for stirring after adding the materials lasts for 35 minutes; then discharging the materials; adding the uniformly-mixed raw materials into a dry powder ball pressing machine or a fireproof material ball pressing machine to be pressed into oval balls with size of 30+/-5mm; and drying the oval balls, then delivering the dried oval balls to a converter production line, conveying the oval balls to a high material bin for later use by using a belt conveyor system, adding the oval balls in the process of pressing slag by the converter according to a process of normally using the slag pressing agent, defoaming and pressing slag.
Description
Technical field
The present invention relates to the method for a kind of blast furnace mud production pressure agent for converter steelmaking.
Background technology
Stemming be iron-smelting blast furnace for blocking the raw material of iron mouth, clamp-oned in iron mouth by pressure by clay gun, thus claim stemming.Blast furnace mud is used to the refractory materials of shutoff iron-smelting blast furnace iron notch, and can be divided into hydrous taphole loam and the large class of anhydrous stemming two at present, it is lower that the former is used in top pressure, during strengthening smelting degree is not high, small blast furnace, the latter is higher in top pressure, on the big-and-middle-sized blast furnace that strengthening smelting degree is high.But the composition major part of stemming can be divided into two portions: refractory aggregate and bonding agent.Refractory aggregate refer to the refractory raw materials such as corundum, mullite, flint clay and coke, mica etc. material modified.Bonding agent is water or the organic materials such as tar-bitumen and resol, goes back admixture SiC, Si
3n
4, swelling agent and admixture etc.Aggregate, by certain granularity and weight composition matrix, makes it to have certain plasticity-, thus can squeeze into Tie Kou by clay gun and block molten iron under the mediation of bonding agent.
Stemming is after using certain cycle, small part can reuse, but the overwhelming majority is due in use, infiltrate the foreign matters such as scum, limit the possibility that it utilizes as refractory materials reworked material, generally arrange process outward as waste, because this waste contains graphite carbon, belong to the waste serious to environmental hazard.In the middle of paper " development of a large blast furnace stemming and use " literary composition that the people such as By consulting literatures (1) beam righteous army, Feng Yunkang, Liang Xiangrong exchanges in the meeting of 2 008 years refractory materials academic exchange papers, do not mention the treatment process with rear discarded stemming; (2) the content statement of the recycling of discarded stemming is not mentioned in the middle of paper " the discarded applied research of refractory magnesia-alumina material in the stemming " literary composition that the people such as Zhang Jinyan, Fan Yonglian, Zhao Jun delivers on the 14 Shanxi, Shandong, Henan, Ji, capital, distant six provinces (city) metal (metallurgy) association refractory materials seminar collection of thesis yet; (3) paper " regeneration of iron and steel enterprise's used refractory " that the paper development of the high-strength environment-friendly stemming " and in the application of newly opening blast furnace " (4) Yao Jinfu, Cui Wei equality people that the people such as Xu Guotao, Li Shuzhong, bear Asia and Africa delivers on " the national energy and thermal technology 2010 Annual Conference " delivers on " refractory materials " magazine of the third phase in 2010 is same does not mention the process recovery process that stemming discarded by blast furnace yet.Consult above document known, also do not have a kind of full dose process blast furnace to discard the processing method of stemming at present.
In addition on the one hand, converter needs slag to pour out major part in the following two cases in stove, so that the thermometric sampling operation of converter and tapping steel, and optimize the enforcement of later stage slag splashing technique: 1, duplex practice carries out the converter of desiliconizing and dephosphorizing, after the task of desiliconizing and dephosphorizing terminates, the major part in stove must be done deslagging process by high phosphorus slag; 2, do not implement the top and bottom combined blown converter of duplex operating procedure, before the sampling of finishing blowing thermometric, the part slag in stove must be poured out; In two kinds of above situations, converter is when deslagging, carbon and oxygen balance relation between the slag of slag and molten steel is in dynamic nonequilibrium situations, makes the bubble level of slag abundanter, in the case, tidal phenomena is there is in Converter, molten iron can be caused during quick deslagging to gush out, and in order to eliminate this contradiction, converter adopts pressure agent to carry out pressure slag froth breaking for the foamy slag in Converter usually, the mechanism of froth breaking is reduction slag viscosity is main enforcement, and pressure agent is main mainly with acid pressure agent.
Summary of the invention
The object of the present invention is to provide a kind of blast furnace mud production pressure agent for the method for converter steelmaking, discarded stemming after adopting blast furnace to use uses as the froth breaking pressure agent of converter, add before bessemerizing the terminal deslagging of falling stove, for froth breaking pressure slag, realize the optimum use of discarded stemming resource, Be very effective.
The object of the present invention is achieved like this, a kind of blast furnace mud production pressure agent is used for the method for converter steelmaking, first utilized by discarded blast furnace mud cone crusher or Raymond mill to be broken into the powdery granule that granularity is below 1mm, select granularity stand-by to pressure ball production line in the limestone powder roping of below 1mm; Be that the ratio of 95:5 adds in stirrer with mass percent by described stemming powder and limestone powder, adopt cyclic mode of operation to carry out stirring and evenly mixing, reinforcedly add up to 5 tons at every turn, after reinforced, pure churning time is 35min, then discharging; Above blend feedstock is joined the oval-shaped ball that dry powder ball press or refractory materials ball press are pressed into 30 ± 5mm, dry post-tensioning and transport to converter lines, the high hopper that use conveyor system is transported to converter is stand-by, converter, according to the normal technical process using pressure agent, adds described oval-shaped ball and carries out froth breaking pressure slag in pressure slag process.
Know-why of the present invention is based on following four points: 1, because discarded stemming is a kind of discarded refractory materials, its refractoriness is at about 1650 DEG C, the temperature of converter liquid steel slag is at 1650 ~ 1720 DEG C, the thermodynamic condition of upgrading slagging reaction needed necessity of slag and dynamic conditions, directly the discarded blast furnace mud of bulk is added in the middle of the liquid steel slag of converter, be difficult to react with the liquid steel slag of converter, play the effect of froth breaking pressure slag.Contriver is according to mechano-chemical reation principle, the fragmentation of discarded blast furnace mud is become the particle of below 1mm, the crystal grain of stemming will produce distortion, the change of lattice energy, the particle making it about 1mm can react under the temperature condition of converter liquid steel slag, can meet the thermodynamic condition of reaction.2, in the graphite carbon in discarded blast furnace mud and slag, ferric oxide reacts, reduce the iron oxide content in slag, reach the object reducing slag surface tension force, the CO bubble produced in reaction process plays in the process floating discharge slag liquid, enter in the bubble of also foamy slag centre, add gas in bubble and, for the pressure of bubble chamber film, play the object of chemistry broken bubble froth breaking, effectively solve the difficult problem that graphite carbon in the middle of discarded stemming is difficult to utilize.3, the SiO in the middle of discarded stemming
2and Al
2o
3can with the high-melting-point substances tricalcium silicate in slag and RO phase reaction, form the material of low melting point, decrease the dystectic suspended substance particle contributing to bloating in the middle of slag, be conducive to broken steeping froth breaking, play the effect of pressure slag, its equation reacted is as follows:
SiO
2+ 3CaO·SiO
2+MgO·2FeO→Fe
2O
3·2CaO +MgO ·CaO·SiO
2
3CaO·SiO
2+ mAl
2O
3→nCaO·mAl
2O
3·SiO
2
The pressure agent of converter routine adds converter in the spheroid mode of ellipse from the high hopper of converter.Stemming discarded by pulverous blast furnace, if directly added from the high hopper of converter, in adition process, under the suction function of converter dust-removing blower fan, major part is sucked and enters dust-removal system by pulverous discarded blast furnace mud, directly pulverous blast furnace is discarded stemming, making becomes pressure agent, graphite carbon in the middle of discarded stemming is in stove in the short period of time, react, form carbon fibre structure, hinder the carrying out of its highly effective reaction, invention is artificial for this reason eliminates this problem, the limestone powder of 10% is added in pressure ball process, make the pressure agent produced after adding converter, limestone powder is heated and expands rapidly, while producing gas, impel that pressure agent spheroid is cracked is called small-particle, the reaction of froth breaking pressure slag can be participated in rapidly, realize the object of pressure slag, wherein the equation of Wingdale decomposes is as follows:
CaCO3→CaO＋CO2
△H=178.3kJ/mol
The present invention is based on foamy slag formation basic theory, in conjunction with the mechanism of physical defoaming and chemical froth breaking, after stemming after being used by blast furnace is pulverized, the ancillary component of adding portion, make the pressure agent becoming converter, apply in convertor steelmaking process, while optimization process for making, realize the application of the value maximization of the later stemming of blast furnace.Environmental benefit and remarkable in economical benefits.The invention solves blast furnace carbon containing and discard the unmanageable problem of stemming, eliminate occupation of land and pollution problem that discarded stemming arranges outward.Graphite carbon in the middle of blast furnace mud is used as reductive agent, often use the stemming of 1 ton, be equivalent to the graphite carbon using 350kg, can ferric oxide in the middle of reduced steel slag, produce metallic iron 1.63 tons directly to enter from slag in molten steel of melting bath, improve the recovery rate of iron in steelmaking process, ton iron, according to the market price of 1500 yuan, produces the direct economic benefit of 1500 yuan.The pressure agent substituting converter traditional carries out pressure slag, and according to the calculation of price of current pressure agent per ton 980 yuan, removing makes limestone powder and the process cost 400 yuan/ton meter of pressure agent needs, directly can reduce steel-making expense 580 yuan again.In sum, the pressure agent often using 1 ton of discarded stemming to make, can produce direct economic benefit 1500+580=2080 unit.
Embodiment
Embodiment:
3 × 2500m is equipped with one
3the Steel Complex of blast furnace and 3 × 120 tons of converters are that example is implemented.Wherein blast furnace taps a blast furnace 15000 tons every day, produces discarded blast furnace mud 10 tons, and converter daily output 18000 tons, molten steel, needs pressure agent 15 tons every day.
1) by discarded blast furnace mud roping to broken region.
2) add fragmentation in the middle of the small-sized unit for inertial conic crusher of the GYP-300 produced by Beijing Kaite Crusher Co., Ltd. in broken region and become the powdery granule of below 1mm, use jumbo bag packaging, roping is stand-by to pressure ball production line.
3) buying is by the harmonious Mining Market in Xinjiang, and granularity is stand-by to pressure ball production line in the limestone powder roping of below 1mm.
4) adopt by the ST-25 biaxial rneader produced with great Zheng scientific & technical corporation in Xinjiang, be that the ratio of 95:5 adds in stirrer with mass percent by discarded stemming and limestone powder, the mode of operation of cycle operation formula is adopted to carry out stirring and evenly mixing, each reinforced 5 tons, after reinforced, pure churning time is discharging after 35min, is transported to by then discharging.
5) above blend feedstock is joined the oval-shaped ball that the dry powder ball press of the HLX-6 type produced by Heng Longxiang company or refractory materials ball press are pressed into 30 ± 5 mm, dry post-tensioning and transport to converter lines, the high hopper that use conveyor system is transported to converter is stand-by.
Converter, according to the normal technical process using pressure agent, adds above product and carries out froth breaking pressure slag in pressure slag process.
Claims (1)
1. a blast furnace mud production pressure agent is used for the method for converter steelmaking, it is characterized in that first being utilized by discarded blast furnace mud cone crusher or Raymond mill to be broken into the powdery granule that granularity is below 1mm, select granularity stand-by to pressure ball production line in the limestone powder roping of below 1mm; Be that the ratio of 95:5 adds in stirrer with mass percent by described stemming powder and limestone powder, adopt cyclic mode of operation to carry out stirring and evenly mixing, reinforcedly add up to 5 tons at every turn, after reinforced, pure churning time is 35min, then discharging; Above blend feedstock is joined the oval-shaped ball that dry powder ball press or refractory materials ball press are pressed into 30 ± 5mm, dry post-tensioning and transport to converter lines, the high hopper that use conveyor system is transported to converter is stand-by, converter, according to the normal technical process using pressure agent, adds described oval-shaped ball and carries out froth breaking pressure slag in pressure slag process.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410789196.7A CN104531938B (en) | 2014-12-19 | 2014-12-19 | A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking |
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|---|---|---|---|
| CN201410789196.7A CN104531938B (en) | 2014-12-19 | 2014-12-19 | A kind of method that blast furnace mud production pressure agent is used for pneumatic steelmaking |
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| CN104531938A true CN104531938A (en) | 2015-04-22 |
| CN104531938B CN104531938B (en) | 2019-01-29 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112580A (en) * | 2015-08-24 | 2015-12-02 | 新疆八一钢铁股份有限公司 | Technique for producing multifunctional converter slag pot defoaming agent |
| CN105132613A (en) * | 2015-09-25 | 2015-12-09 | 唐山不锈钢有限责任公司 | Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method |
| CN105132605A (en) * | 2015-09-02 | 2015-12-09 | 新疆八一钢铁股份有限公司 | Process for pressing slag and removing foam of converter slag tank by using blast furnace gas ash |
| CN107236835A (en) * | 2017-06-30 | 2017-10-10 | 河南龙成煤高效技术应用有限公司 | A kind of method that steel cuttings cake enters blast furnace ironmaking |
| CN114717376A (en) * | 2022-05-13 | 2022-07-08 | 山东钢铁集团永锋临港有限公司 | Method for improving slag pressing effect |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118717A (en) * | 1993-10-21 | 1995-05-09 | Nippon Rutsubo Kk | Tapping hole filler |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
-
2014
- 2014-12-19 CN CN201410789196.7A patent/CN104531938B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07118717A (en) * | 1993-10-21 | 1995-05-09 | Nippon Rutsubo Kk | Tapping hole filler |
| CN103484595A (en) * | 2013-09-17 | 2014-01-01 | 新疆中合大正商贸有限公司 | Production process of magnesian slag pressing agents |
| CN103451374A (en) * | 2013-09-22 | 2013-12-18 | 新疆中合大正商贸有限公司 | Production process of aluminium slag adjusting agent for LF refining furnace |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112580A (en) * | 2015-08-24 | 2015-12-02 | 新疆八一钢铁股份有限公司 | Technique for producing multifunctional converter slag pot defoaming agent |
| CN105132605A (en) * | 2015-09-02 | 2015-12-09 | 新疆八一钢铁股份有限公司 | Process for pressing slag and removing foam of converter slag tank by using blast furnace gas ash |
| CN105132613A (en) * | 2015-09-25 | 2015-12-09 | 唐山不锈钢有限责任公司 | Application of coal gangue used as converter slag inhibiting agent, and converter slag inhibiting method |
| CN105132613B (en) * | 2015-09-25 | 2017-10-10 | 唐山不锈钢有限责任公司 | The application and converter that gangue presses down slag agent as converter press down the method for slag |
| CN107236835A (en) * | 2017-06-30 | 2017-10-10 | 河南龙成煤高效技术应用有限公司 | A kind of method that steel cuttings cake enters blast furnace ironmaking |
| CN114717376A (en) * | 2022-05-13 | 2022-07-08 | 山东钢铁集团永锋临港有限公司 | Method for improving slag pressing effect |
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| CN104531938B (en) | 2019-01-29 |
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