CN103397136A - 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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- CN103397136A CN103397136A CN2013103006804A CN201310300680A CN103397136A CN 103397136 A CN103397136 A CN 103397136A CN 2013103006804 A CN2013103006804 A CN 2013103006804A CN 201310300680 A CN201310300680 A CN 201310300680A CN 103397136 A CN103397136 A CN 103397136A
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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 stablize the residual thick slag method of spattering of converter bottom under a kind of less-slag melting condition.
Background technology
Present iron and steel enterprise competition, under these circumstances, reduction consumes, the production control cost just seems particularly important.Good bottom-blowing of converter effect can effectively be improved the metallurgy condition of converter steelmaking process, impels reaction near equilibrium state, thereby reduces blow loss, improves recovery rate of iron, reduces raw materials consumption, optimizes steel quality.
" complete three take off " the less-slag melting technique that now adopts, bottom blowing system for converter adopts the deep bid bottom blowing gun of non-exchange formula, and the production kind is take low-carbon (LC), Ultra-low carbon steel grades such as auto sheet, pipe line steel, appliance plates as main.The converter quantity of slag is few, smelting kind terminal slag oxidation is stronger, cause the stove labour middle and later periods (furnace life is greater than 4000 stoves), converter bottom particularly bottom blowing hole site corrodes serious, usually be forced to even all bottom blowing holes of closed portion, not only smelting cost increases, and the emphasis kind such as auto sheet, high-grade pipe line steel can't arrange, and organization of production is in the dock.How under existing smelting technology, breed structure condition, the erosion of accomplishing artificially to reduce converter bottom is the key that guarantees the 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 under the less-slag melting condition that consumes, saves cost and stablize the residual thick slag method of spattering of converter bottom.
For solving the problems of the technologies described above, the invention provides under a kind of less-slag melting condition and stablize the residual thick slag method of spattering of converter bottom, be the slag operation that spatters for 300 tons of converter smeltings, to compare with the slag method of spattering of existing converter smelting, its difference is:
After tapping finishes, select to spatter the slag scheme according to spattering the slag condition:, as converter terminal oxygen level [O]＜800ppm, according to scheme one, spatter slag; , when converter terminal oxygen level [O] 〉=800ppm or after-blow number of times 〉=1 time, according to scheme two, spatter slag; After spattering slag and completing, the slag effect is spattered in inspection;
Described scheme one is: spattering the slag nitrogen flow is 1000Nm
3/ min, spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1000-1200kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, oxygen lance position drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, while spattering slag 250s, oxygen lance position rises to 2.5m, proposes the rifle deslagging while spattering slag 300s;
Described scheme two is: spattering the slag nitrogen flow is 1000Nm
3/ min, spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1200-1500kg, coke 500-1000kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, oxygen lance position drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, while spattering slag 250s, oxygen lance position rises to 2.5m, proposes the rifle deslagging while 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 the residual thick slag method of spattering of converter bottom under less-slag melting condition provided by the invention, optimized and spattered slag rifle position: namely early stage, high rifle position added slag supplying agent, control slag oxidation, guarantee slag and slag supplying agent Blending Efficiency of Blending, mid-term, slag assurance furnace wall dry slag was spattered in low rifle position, the further cooled slag in high rifle of later stage position guarantees furnace bottom dry slag effect, accomplished that manual control reduces the erosion of converter bottom, stablized the residual thick of converter bottom, solved stove labour middle and later periods converter bottom and particularly corroded a serious difficult problem in the bottom blowing hole site; Not only effectively improve the metallurgy condition of converter steelmaking process, impelled reaction near equilibrium state, and can reduce blow loss, improved recovery rate of iron, reduced raw materials consumption, optimized steel quality.Simultaneously, optimize the slag supplying agent proportioning, except using traditional modification agent, light dolomite etc., the different steps of spattering slag in converter, also add cheap unprocessed dolomite as quick cooling agent, not only played good cooling-down effect, can also save production cost.
Description of drawings
Stablize the residual thick slag method process flow sheet that spatters of converter bottom under the less-slag melting condition that Fig. 1 provides for the embodiment of the present invention.
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
Referring to Fig. 1, stablize the residual thick slag method of spattering of converter bottom under a kind of less-slag melting condition that the embodiment of the present invention provides,, for 300 tons of converter smeltings, after tapping finishes, according to spattering the slag condition, select to spatter the slag scheme.
, as converter terminal oxygen level [O]＜800ppm, according to scheme one, spatter slag: spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1000-1200kg, spatter slag and open that to blow the rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, the oxygen rifle drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen rifle, while spattering slag 250s, the oxygen rifle rises to 2.5m, proposes the rifle deslagging while 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 this moment, slag was rare, spattered the slag process and had been difficult for slag, spatter slag and in earlier stage need add part of coke and FeO to react the oxygen that consumes in slag, reach the purpose of quick dry slag.Therefore spattering slag carries 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 the rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, the oxygen rifle drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen rifle, while spattering slag 250s, the oxygen rifle rises to 2.5m, proposes the rifle deslagging while 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 the slag nitrogen flow is 1000Nm/min.
After spattering slag and completing, check the effect of spattering slag.
Embodiment 1
300 tons of converter smelting SPHC steel grades are walked the light treatment process route of RH; Converter terminal oxygen 450ppm, adopt and to spatter the slag scheme and be: first add magnesium carbon ball 998kg in stove before spattering slag, spatter slag and open and blow rifle position 2.5m; After opening and blowing 15s, add unprocessed dolomite 1532kg, light dolomite 651kg, while spattering slag 90s, the oxygen rifle drops to 1.2m, add unprocessed dolomite 336kg while spattering slag 150s, in order to guarantee furnace crown and tap hole position, spatter the slag effect, the constant 1.0m of oxygen lance position, while spattering slag 250s, the oxygen rifle rises to 2.5m, proposes the rifle deslagging while spattering slag 300s.Wherein, the oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of shower nozzle, and the flow that spatters nitrogen in slag is 1000Nm3/min.
Process condition: it is respond well that process is spattered slag, spatters slag and start the 90s visible a large amount of thickness slag bunch groups of fire door later.
The slag result is spattered in check: after spattering slag and completing, shaft position slag blanket is uniformly distributed, and has no obvious dropping situations; After deslagging, obviously as seen, slag all spatters dried the furnace bottom dry slag, without liquid slag.
300 tons of converter smelting X80 steel grades are walked the LF operational path; Converter terminal oxygen 892ppm, adopt and to spatter the slag scheme and be: spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1490kg, coke 885kg, spatter slag and open and blow rifle position 2.5m; After opening and blowing 15s, add unprocessed dolomite 2120kg, light dolomite 994kg, while spattering slag 90s, the oxygen rifle drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, in order to guarantee restoration of lower stack, spatter the slag effect, spatter the constant 1.3m of oxygen lance position after slag 150s, while spattering slag 250s, the oxygen rifle rises to 2.5m, proposes the rifle deslagging while spattering slag 300s.Wherein, the oxygen rifle adopts six hole tapering oxygen rifles, the Mach 2 ship 2.1 of shower nozzle, and the flow that spatters nitrogen in slag is 1000Nm3/min.
Process condition: it is respond well that process is spattered slag, spatters slag and start the 90s visible a large amount of thickness slag bunch groups of fire door later.
The slag result is spattered in check: after spattering slag and completing, shaft position slag blanket is uniformly distributed, and has no obvious dropping situations; After deslagging, obviously as seen, slag all spatters dried the furnace bottom dry slag, without liquid slag.
Referring to Fig. 2, stablize the residual thick slag method of spattering of converter bottom under a kind of less-slag melting condition provided by the invention, by statistics, in the 2# decarbonizing furnace 3500-4500 stage in furnace life, be total to fettling 68 times, wherein front large face is 39 times, rear large face 25 times, furnace bottom 4 times, can find out, adopt provided by the invention spatter the slag method after, the residual thick stabilized zone that maintains 600-900mm of converter bottom, successful.
Stablize the residual thick slag method of spattering of converter bottom under a kind of less-slag melting condition provided by the invention, in actual production, the full stove labour of first stove labour converter bottom thickness of 2# decarbonizing furnace maintains 600-900mm, average carbon oxygen long-pending 0.0023, reduced by 0.0002 than last stove labour, the more last stove labour of the average terminal oxygen of converter reduces 50ppm, can save ferro-aluminum 75kg/ stove, and whole stove labour is saved ferro-aluminum and consumed approximately 5,020,000 yuan; Converter finishing slag TFe% reduces by 0.8% than last stove labour, reduces iron and steel stock and amounts to approximately 1.8 yuan/t of cost, and whole stove labour reduces approximately 371.9 ten thousand yuan of iron and steel stock costs; Save approximately 1,030,000 yuan of anti-materials; Accumulative total is saved 976.9 ten thousand yuan of costs.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (2)
1. stablizing the residual thick slag method of spattering of converter bottom under a less-slag melting condition, is the slag operation that spatters for 300 tons of converter smeltings, it is characterized in that:
After tapping finishes, select to spatter the slag scheme according to spattering the slag condition:, as converter terminal oxygen level [O]＜800ppm, according to scheme one, spatter slag; , when converter terminal oxygen level [O] 〉=800ppm or after-blow number of times 〉=1 time, according to scheme two, spatter slag; After spattering slag and completing, the slag effect is spattered in inspection;
Described scheme one is: spattering the slag nitrogen flow is 1000Nm
3/ min, spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1000-1200kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, oxygen lance position drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, while spattering slag 250s, oxygen lance position rises to 2.5m, proposes the rifle deslagging while spattering slag 300s;
Described scheme two is: spattering the slag nitrogen flow is 1000Nm
3/ min, spatter in slag prerequisite forward direction stove and add magnesium carbon ball 1200-1500kg, coke 500-1000kg, and spattering slag, to open oxygen-blowing gun rifle position be 2.5m; After opening and blowing 15s, add unprocessed dolomite 1500-2000kg, light dolomite 500-1000kg, while spattering slag 90s, oxygen lance position drops to 1.2m, add unprocessed dolomite 300-500kg while spattering slag 150s, regulate between 1.0-1.5m according to spattering slag target location oxygen lance position, while spattering slag 250s, oxygen lance position rises to 2.5m, proposes the rifle deslagging while spattering slag 300s.
2. stablize the residual thick slag method of spattering of converter bottom under less-slag melting condition according to claim 1, 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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Cited By (9)
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| CN103602776A (en) * | 2013-11-29 | 2014-02-26 | 武汉钢铁(集团)公司 | Slag conditioning method for converter slag-splashing converter-protection technology |
| CN105821175A (en) * | 2016-05-27 | 2016-08-03 | 山东钢铁股份有限公司 | Slag-splashing converter protection method for controlling converter profiles |
| 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 |
| CN111254251A (en) * | 2018-11-30 | 2020-06-09 | 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 |
| 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 |
| CN112853033A (en) * | 2021-03-10 | 2021-05-28 | 柳州钢铁股份有限公司 | Efficient slag splashing intelligent control method and system based on furnace mouth image analysis |
| CN112981033A (en) * | 2021-02-04 | 2021-06-18 | 新余钢铁股份有限公司 | Automatic slag splashing control method and system for converter |
| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103602776A (en) * | 2013-11-29 | 2014-02-26 | 武汉钢铁(集团)公司 | Slag conditioning method for converter slag-splashing converter-protection technology |
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| CN105821175A (en) * | 2016-05-27 | 2016-08-03 | 山东钢铁股份有限公司 | Slag-splashing converter protection method for controlling converter profiles |
| 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 |
| CN111254251A (en) * | 2018-11-30 | 2020-06-09 | 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 |
| CN114277212A (en) * | 2020-12-23 | 2022-04-05 | 天津荣程联合钢铁集团有限公司 | Method for prolonging service life of converter |
| CN112981033A (en) * | 2021-02-04 | 2021-06-18 | 新余钢铁股份有限公司 | Automatic slag splashing control method and system for converter |
| CN112853033A (en) * | 2021-03-10 | 2021-05-28 | 柳州钢铁股份有限公司 | Efficient slag splashing intelligent control method and system based on furnace mouth image analysis |
| 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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