CN103397136B - Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition - Google Patents
Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition Download PDFInfo
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- CN103397136B CN103397136B CN201310300680.4A CN201310300680A CN103397136B CN 103397136 B CN103397136 B CN 103397136B CN 201310300680 A CN201310300680 A CN 201310300680A CN 103397136 B CN103397136 B CN 103397136B
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Abstract
The invention provides a residue splashing method for stabilizing converter hearth residue thickness under a low-residue smelting condition, which is a residue splashing operation after 300-ton converter smelting steel-tapping is completed. The residue splashing method comprises the following steps of: adopting a six-pore taper oxygen lance, wherein the mach number of a spray head is 2.1, and the flow rate of the residue splashing nitrogen gas is 1000Nm/minute; and selecting different residue splashing schemes according to the difference of final-point oxygen content of the converter. According to the residue splashing method for stabilizing converter hearth residue thickness under the low-residue smelting condition disclosed by the invention, by optimizing the residue splashing gun position and optimizing the proportion of the slag preparing agent, the hearth erosion in the converter smelting is reduced, the residue thickness at the converter hearth is stabilized, the material consumption is lowered and the cost is saved.
Description
Technical field
The invention belongs to steelmaking technical field, particularly under a kind of less-slag melting condition, stablize that converter bottom is residual thick spatters slag method.
Background technology
Current iron and steel enterprise competition, under these circumstances, reduction consumes, production control cost just seems particularly important.Good bottom-blowing of converter effect effectively can improve the metallurgy condition of converter steelmaking process, impels reaction close to equilibrium state, thus reduces blow loss, improve recovery rate of iron, reduce raw materials consumption, optimize steel quality.
" complete three take off " the less-slag melting technique now adopted, bottom blowing system for converter adopts the deep bid bottom blowing gun of non-exchange formula, and production kind is based on low-carbon (LC), Ultra-low carbon steel grades such as auto sheet, pipe line steel, appliance plates.The converter quantity of slag is few, smelting kind terminal slag beneficiation is stronger, stove is caused to use as a servant the middle and later periods (furnace life is greater than 4000 stoves), converter bottom particularly bottom blowing hole site corrodes serious, usually be forced to closed portion even all bottom blowing holes, not only smelting cost increases, and the emphasis such as auto sheet, high-grade pipe line steel kind cannot arrange, and makes organization of production be in the dock.How under existing smelting technology, breed structure condition, the erosion accomplishing artificially to reduce converter bottom is the key ensureing bottom-blowing of converter effect.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of furnace bottom that can reduce and corrodes, reduces and consume, stablize that converter bottom is residual thick spatters slag method under cost-saving less-slag melting condition.
For solving the problems of the technologies described above, stablizing that converter bottom is residual thick spatters slag method under the invention provides a kind of less-slag melting condition, is spatter slag operation for 300 tons of converter smeltings, with existing converter smelting spatter compared with slag method, its difference is:
After tapping terminates, select to spatter slag scheme according to spattering slag condition: as converter terminal oxygen level [O] <800ppm, carry out spattering slag according to scheme one; When converter terminal oxygen level [O] >=800ppm or after-blow number of times >=1 time, carry out spattering slag according to scheme two; Spatter slag complete after inspection spatter slag effect;
Described scheme one is: spattering slag nitrogen flow is 1000Nm
3/ min, spatters in slag prerequisite forward direction stove and adds magnesium carbon ball 1000-1200kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen lance position drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, when spattering slag 250s, oxygen lance position rises to 2.5m, proposes rifle deslagging when spattering slag 300s;
Described scheme two is: spattering slag nitrogen flow is 1000Nm
3/ min, spatters in slag prerequisite forward direction stove and adds magnesium carbon ball 1200-1500kg, coke 500-1000kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen lance position drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, when spattering slag 250s, oxygen lance position rises to 2.5m, proposes rifle deslagging when spattering slag 300s.
Further, described oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of described oxygen lance blow head.
Stablize under less-slag melting condition provided by the invention that converter bottom is residual thick spatters slag method, optimize and spatter slag rifle position: namely early stage, high rifle position added slag supplying agent, control slag beneficiation, ensure slag and slag supplying agent Blending Efficiency of Blending, mid-term, slag guarantee furnace wall dry slag was spattered in low rifle position, the further cooled slag in later stage height rifle position ensures furnace bottom dry slag effect, accomplish that manual control reduces the erosion of converter bottom, stabilize the residual thick of converter bottom, solve stove labour middle and later periods converter bottom and particularly corrode a serious difficult problem in bottom blowing hole site; Not only effectively improve the metallurgy condition of converter steelmaking process, impel reaction close to equilibrium state, and can blow loss be reduced, improve recovery rate of iron, reduce raw materials consumption, optimize steel quality.Meanwhile, optimizing slag supplying agent proportioning, except using traditional modification agent, light dolomite etc., spattering the different steps of slag in converter, also add cheap unprocessed dolomite as quick cooling agent, not only serve good cooling-down effect, can also save production cost.
Accompanying drawing explanation
Stablize under the less-slag melting condition that Fig. 1 provides for the embodiment of the present invention that converter bottom is residual thick spatters slag method process flow sheet.
The thickness measurement with laser trend map in the 2# decarbonizing furnace 3500-4500 stage in furnace life that Fig. 2 provides for the embodiment of the present invention.
Embodiment
See Fig. 1, under a kind of less-slag melting condition that the embodiment of the present invention provides, stablizing that converter bottom is residual thick spatters slag method, for 300 tons of converter smeltings, after tapping terminates, selecting to spatter slag scheme according to spattering slag condition.
As converter terminal oxygen level [O] <800ppm, carry out spattering slag according to scheme one: spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1000-1200kg, spatter slag and open that to blow rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen rifle drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen rifle, when spattering slag 250s, oxygen rifle rises to 2.5m, proposes rifle deslagging when spattering slag 300s.
When converter terminal oxygen level [O] >=800ppm or after-blow number of times >=1 time, in slag, FeO content is usually more than 30%, and now slag is rare, spatters slag process and not easily plays slag, spatter slag and need add part of coke and FeO reacts the oxygen consumed in slag early stage, reach the object of quick dry slag.Therefore spatter slag and carry out according to scheme two: spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1200-1500kg, coke 500-1000kg, spatter slag and open that to blow rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen rifle drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen rifle, when spattering slag 250s, oxygen rifle rises to 2.5m, proposes rifle deslagging when spattering slag 300s.
Wherein, oxygen rifle and flow set: adopt six hole tapering oxygen rifles, the Mach 2 ship 2.1 of shower nozzle, spattering slag nitrogen flow is 1000Nm/min.
Spatter after slag completes, check the effect of spattering slag.
Embodiment 1
The light treatment process route of RH walked by 300 tons of converter smelting SPHC steel grades; Converter terminal oxygen 450ppm, adopts and spatters slag scheme and be: first in stove, add magnesium carbon ball 998kg before spattering slag, spatters slag and opens and blow rifle position 2.5m; Open after blowing 15s, add unprocessed dolomite 1532kg, light dolomite 651kg, when spattering slag 90s, oxygen rifle drops to 1.2m, unprocessed dolomite 336kg is added, in order to ensure that slag effect is spattered in furnace crown and tap hole position, oxygen lance position constant 1.0m when spattering slag 150s, when spattering slag 250s, oxygen rifle rises to 2.5m, proposes rifle deslagging when spattering slag 300s.Wherein, oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of shower nozzle, and the flow spattering nitrogen in slag is 1000Nm3/min.
Process condition: it is respond well that process spatters slag, spatters slag and starts the 90s visible a large amount of thickness slag bunch group of fire door later.
Inspection spatter slag result: spatter slag complete after shaft position slag blanket be uniformly distributed, have no obvious dropping situations; After deslagging, furnace bottom dry slag is obviously visible, and slag all spatters dry, without liquid slag.
Embodiment 2
LF operational path walked by 300 tons of converter smelting X80 steel grades; Converter terminal oxygen 892ppm, adopts and spatters slag scheme and be: spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1490kg, coke 885kg, spatters slag and opens and blow rifle position 2.5m; Open after blowing 15s, add unprocessed dolomite 2120kg, light dolomite 994kg, when spattering slag 90s, oxygen rifle drops to 1.2m, adding unprocessed dolomite 300-500kg when spattering slag 150s, in order to ensure that restoration of lower stack spatters slag effect, spattering the constant 1.3m of oxygen lance position after slag 150s, when spattering slag 250s, oxygen rifle rises to 2.5m, proposes rifle deslagging when spattering slag 300s.Wherein, oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of shower nozzle, and the flow spattering nitrogen in slag is 1000Nm3/min.
Process condition: it is respond well that process spatters slag, spatters slag and starts the 90s visible a large amount of thickness slag bunch group of fire door later.
Inspection spatter slag result: spatter slag complete after shaft position slag blanket be uniformly distributed, have no obvious dropping situations; After deslagging, furnace bottom dry slag is obviously visible, and slag all spatters dry, without liquid slag.
See Fig. 2, stablize under a kind of less-slag melting condition provided by the invention that converter bottom is residual thick spatters slag method, through statistics, be total to fettling 68 times in the 2# decarbonizing furnace 3500-4500 stage in furnace life, 39 times, large face wherein, 25 times, rear large face, furnace bottom 4 times, can find out, adopt provided by the invention spatter slag method after, the residual thick stabilized zone maintaining 600-900mm of converter bottom, successful.
Stablize under a kind of less-slag melting condition provided by the invention that converter bottom is residual thick spatters slag method, in actual production, first stove of 2# decarbonizing furnace is used as a servant full stove labour converter bottom thickness and is maintained 600-900mm, average carbon oxygen long-pending 0.0023, than the reduction by 0.0002 of last stove labour, the more last stove labour of converter mean end-point oxygen reduces 50ppm, can save ferro-aluminum 75kg/ stove, and whole stove labour saves ferro-aluminum consumption about 5,020,000 yuan; Converter finishing slag TFe%, than the reduction by 0.8% of last stove labour, reduces iron and steel stock and amounts to cost about 1.8 yuan/t, and whole stove labour reduces iron and steel stock cost about 371.9 ten thousand yuan; Save resistance to material about 1,030,000 yuan; Accumulative cost-saving 976.9 ten thousand yuan.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. stablize under less-slag melting condition that converter bottom is residual thick spatters a slag method, be spatter slag operation for 300 tons of converter smeltings, it is characterized in that:
After tapping terminates, select to spatter slag scheme according to spattering slag condition: as converter terminal oxygen level [O] <800ppm, carry out spattering slag according to scheme one; As converter terminal oxygen level [O] >=800ppm, carry out spattering slag according to scheme two; Spatter slag complete after inspection spatter slag effect;
Described scheme one is: spattering slag nitrogen flow is 1000Nm
3/ min, spatters in slag prerequisite forward direction stove and adds magnesium carbon ball 1000-1200kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen lance position drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, when spattering slag 250s, oxygen lance position rises to 2.5m, proposes rifle deslagging when spattering slag 300s;
Described scheme two is: spattering slag nitrogen flow is 1000Nm
3/ min, spatters in slag prerequisite forward direction stove and adds magnesium carbon ball 1200-1500kg, coke 500-1000kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; Open after blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, when spattering slag 90s, oxygen lance position drops to 1.2m, unprocessed dolomite 300-500kg is added when spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, when spattering slag 250s, oxygen lance position rises to 2.5m, proposes rifle deslagging when spattering slag 300s.
2. stablize under less-slag melting condition according to claim 1 that converter bottom is residual thick spatters slag method, it is characterized in that: described oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of described oxygen lance blow head.
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| CN201310300680.4A CN103397136B (en) | 2013-07-17 | 2013-07-17 | Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103602776B (en) * | 2013-11-29 | 2016-01-13 | 武汉钢铁(集团)公司 | For the Slag modification method in splashing slag in converter technique |
| CN105821175B (en) * | 2016-05-27 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of protecting method with splash slag of control converter profile |
| CN111254251B (en) * | 2018-11-30 | 2021-12-14 | 上海梅山钢铁股份有限公司 | Converter slag splashing gun position automatic control method based on furnace bottom thickness |
| CN110157859A (en) * | 2019-04-18 | 2019-08-23 | 河钢股份有限公司承德分公司 | Finishing slag adjusting material and its application method for semisteel smelting splashing slag in converter |
| CN111440917A (en) * | 2020-04-21 | 2020-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling uniform erosion of steel furnace bottom blowing bricks and furnace bottom |
| CN112442566A (en) * | 2020-10-16 | 2021-03-05 | 广东韶钢松山股份有限公司 | Converter bottom protection method |
| CN114277212B (en) * | 2020-12-23 | 2023-01-17 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
| CN112981033B (en) * | 2021-02-04 | 2022-06-07 | 新余钢铁股份有限公司 | Automatic slag splashing control method and system for converter |
| CN112853033B (en) * | 2021-03-10 | 2023-10-13 | 柳州钢铁股份有限公司 | Efficient slag splashing intelligent control method and system based on furnace mouth image analysis |
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| CN102344984B (en) * | 2011-09-14 | 2013-05-08 | 首钢京唐钢铁联合有限责任公司 | Semisteel smelting and slag remaining method under dry dedusting conduction |
| CN102424886B (en) * | 2011-12-31 | 2013-03-27 | 钢铁研究总院 | Furnace protection process for decarburization converter less slag splashing |
| CN102660658B (en) * | 2012-05-23 | 2014-08-20 | 北京首钢股份有限公司 | Method for curing converter slag |
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