CN106987665A - A kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion - Google Patents
A kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion Download PDFInfo
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- CN106987665A CN106987665A CN201710086887.4A CN201710086887A CN106987665A CN 106987665 A CN106987665 A CN 106987665A CN 201710086887 A CN201710086887 A CN 201710086887A CN 106987665 A CN106987665 A CN 106987665A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/007—Conditions of the cokes or characterised by the cokes used
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2300/00—Process aspects
- C21B2300/02—Particular sequence of the process steps
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Abstract
The invention discloses a kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion, including following operating procedure：A, holding rich-oxygen of blast furnace rate are 5%, adjust gas flowrate in bosh；B, diminution air port area, it is ensured that wind speed is in 265m/s or so, and blast energy is in 11000kgm/s or so；2180-2230 DEG C suitable of theoretical tuyere combustion temperature of c, maintenance, keeps wind-warm syndrome to 1,130 1170 DEG C, improves 20-30g/t of hygroscopic water；D, high-coal ratio is carried to 150kg/t, coke ratio remains unchanged, improve fuel ratio to 565kg/t, it is ensured that suitable coal gas amount, top temperature is not less than 120 DEG C；E, adjustment burden distribution system and ore deposit batch weight, cloth pattern
Description
Technical field
The present invention relates to a kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion.
Background technology
According to incompletely statistics, the whole nation >=2500m3Blast furnace process need coke hot strength（CSR）Generally control
More than 60%, less than this numerical value, the blast furnace stable smooth operation of the type can not just ensure.The CSR of coke and the property breath of coking coal cease
Correlation, the CSR difference of different zones coal is very big, and central China, east, Mongolia area, the outer CSR for covering regional and Australia area are general
All over all higher, but China's western region CSR is very low, some coals even zero, and main cause is its coal-forming age, coal-forming mistake
Journey, Coal-forming Plants species and inland are caused by there were significant differences.
The steel company of Xinjiang eight is located in western part of China Urumqi City west, and Ewirgol colliery is the own colliery of eight steel,
1890 coals, 1930 coals, 2130 coals can be produced（Depending on foundation height above sea level, similarly hereinafter）, although the coke individually or after coal blending refined
Cold strength is fine, but hot strength is very poor, i.e., reactivity height, post reaction strength are low, and the coal is with leading under conventional wisdom guidance
Normal coking coal property pole is not met, and index is far inferior to domestic similar coal, and 1890 coals are partial to bottle coal, and 2130 coals are partial to rich coal, these
Abnormal phenomena and its original Coal-forming Plants, the condition of coal formation and geological epoch etc. have direct relation, therefore the property of the coke generated
Matter is also more special.Before the end of the year in 2015, to reach 2500m3The burnt requirement of use of blast furnace, eight steel companies make a big purchase hyperpyrexia in large quantities in many ways
State（CSR）Shanxi coal, Ningxia coal, Mongolian coal, freight charges are up to 300-400 yuan/ton, enter factory Shanxi, outer illiteracy coking coal close prices
2000 yuan/ton, coke cost, the molten iron cost of production in industry belong to high-order, and, company of 2015 Nian Bagang companies in 2014
The lossing state for being in billions of amount of money in continuous 2 years, is on the verge of the edge of capital chain rupture.But minimum self-produced 1890 coal of cost
Usage amount is limited, and colliery is chronically at limited production state.
The content of the invention
It is an object of the invention to provide a kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion, energy
Enough substantially reduce the requirement of STRENGTH ON COKE hot performance, reduction coke cost and molten iron cost, it is ensured that 2500m3Blast furnace is in low CSR feelings
Normally smelted under condition.
The object of the present invention is achieved like this, a kind of production work that large blast furnace coke is refined with low-heat state coal at high proportion
Skill, including following operating procedure：
A, holding rich-oxygen of blast furnace rate are 5%, and it is 4600Nm to keep the blast furnace feeding blow rate required3/ min, maintains furnace processor 5150t not
Become, adjust gas flowrate in bosh, make its numeric ratio 2500m3Low 300 Nm of gas flowrate in bosh during the normal working of a furnace of blast furnace3/min；
B, diminution air port area, make it than the normal blast furnace operating air port small 0.015m of area2--0.02m2, it is ensured that wind speed exists
265m/s or so, blast energy is in 11000kgm/s or so；
2180-2230 DEG C suitable of theoretical tuyere combustion temperature of c, maintenance, keeps wind-warm syndrome to 1130--1170 DEG C, improves wet
Divide 20-30g/t；
D, high-coal ratio is carried to 150kg/t, coke ratio remains unchanged, improve fuel ratio to 565kg/t, it is ensured that suitable coal gas amount, stove
Top temperature is not less than 120 DEG C；
E, adjustment burden distribution system and ore deposit batch weight, cloth pattern, ore deposit batch 62t-64t, according to temperature is pushed up, in proportion
Adjust ore deposit coke (per) charge weight, it is ensured that blast furnace center and blast furnace edge twice Gas Flow；
Grasp the formulation of smelting system：
A, gas flowrate in bosh cannot be less than 5900m3/h；
B, furnace temperature adjustment order：The gain of heat：Coal-humidification -- wind-warm syndrome-coke；Reduction of heat：Humidification-wind-warm syndrome -- subtract coal-coke；Iron
Coolant-temperature gage PT is at least 1500 DEG C；
C, top temperature control system：If two 5 batch of material times are more than 2500m3Regulation material speed during the normal working of a furnace of blast furnace, top temperature is descending, then
Subtract the m of oxygen 10003/h -2000 m3/ h, action will have lead in the control of top temperature, that is, push up temperature control system at 120-150 DEG C, even
The continuous warm average value in two hours top decrease beyond 20 DEG C, slightly control material speed, subtracts the m of oxygen 10003/h -2000 m3/h；
D, guarantee CCT1/CCT2 temperature strengthen central gas stream, its adjustment order at 470 DEG C/350 DEG C：Stockline -- cloth pattern,
Stockline adjusts 0.1-0.2m, if big change does not occur for four hour air-flows, adjusts cloth pattern, cloth is adjusted on gear
The number of turns 0.5-1 is enclosed；
E, guarantee Tf value≤2250 DEG C.
By adjusting hygroscopic water, coal powder injection, wind-warm syndrome means to Tf value≤2250 DEG C can not be ensured in oxygen enrichment percentage lifting process, up to not
To when requiring consumption, subtracting Rich Oxygen Amount in time, and adjusted according to Tf values.
2500m3Coal, high oxygen-enriched operation commerical test in the full boundary of blast furnace.
2500m3Coke quality was declined slightly during bf test, gradually reduces dry coke quenching ratio, by 50% to November 1
Day shift dry coke quenching ratio reduces to 0%.In view of the pressure of molten iron cost, iterative method Blending is real from September in 2015 10 days
Apply adjustment Blending, the hot CSR of reduction coke：The first step：Adjust the hot CSR indexs of coke stable in 37%--41% or so,
Blast furnace adjustment operation, stable furnace condition；Second step：Plan is stable in 32%--38% or so, October 27 -- November 10 by CSR indexs
Day, the main blast furnace operated using C blast furnaces as coal in full boundary.Coal in full boundary, high oxygen-enriched production operation process are used in C blast furnaces
In, the achievement of stage is achieved, November 10, C blast furnaces entered long period shutdown maintenance；3rd step：Continue to promote coal in full boundary
Close-burning structure is used, the hot CSR controls of coke are in 26%--30% or so.Blast furnace continues to optimize operation, by adjusting air supply parameter, cooling
The means such as system, burden structure, adapt to low-heat state coke, it is ensured that working of a furnace stable smooth operation.During testing, boundary outer coal, Jiao are disabled
Charcoal low-heat state, oxygen-enriched 5% operation, blast furnace pressure difference slightly have rise, but without slump material, conditions of blast furnace direct motion, success of the test.
Bf test operating parameter, is shown in Table 1.
With the coke quality and cost of coal coking in full boundary.
Since commerical test, coal consumption reaches 80% in boundary, wherein Chinese mugwort pit coal is fitted on 52%, furnace condition anterograde stable with Jiao.
Start the unified proportioning coke raw material cost of four coke ovens on November 9 and be reduced to 862.7 yuan/ton from 914.1 yuan/ton of Jiao of experimentation cost
Jiao, reduces 51.4 yuan/ton of Jiao.End 794.3 yuan/ton of Jiao of coke cost on December 23rd, 2015, matched than basis in October
Coke cost 958 yuan/ton of burnt reductions, 163.7 yuan/ton of Jiao, it is accumulative to reduce by 163.7 yuan/ton of Jiao of cost.By on January 5th, 2016
Continue optimizing blending plan, 1890 coals are progressively with being added to 20%, and coke cost is reduced to 751.4 yuan/ton of Jiao.
1st, the research of theoretical foundation is used as the strong point of the invention.
1）Coke hot performance is re-recognized, and the characterizing method of traditional Thermal Properties of Coke is coke in permanent reaction time bar
The drum strength determined under part, but by mechanism of the STRENGTH ON COKE in blast furnace from the point of view of, be present mistaken ideas in the method, characterized
Journey has irrationality.By theory analysis, 2500m is re-recognized3Coke and CO that blast furnace is used2Reactivity, coke perseverance lose
CSR is determined under weight condition, this hot numerical value is in higher level, and 2500m can be met completely3The use of blast furnace.
2）Found by studying, coke its compression strength that coal is refined in boundary at high proportion is very high, and have very high tough
Property, compared to outside boundary, high hot coke has its outstanding feature, shows that the coke of eight steel is difficult to be crushed in blast furnace, has the ability to undertake
The load of whole stock column, can ensure the gas permeability of blast furnace.
3）The theoretical production principle of OY1# stoves oxygen-enriched injection is used for reference, to break through the operation smelting system of eight steel blast furnaces, with reference to
The high oxygen-enriched injection production technology of OY1# stoves, in 2500m3Blast furnace implements high oxygen-enriched, high reaction, the operation policy of relatively thin soft melt zone
Commerical test is carried out, to reduce pressure difference, improve gas utilization rate.Industrial production test is carried out using the inventive method, it was demonstrated that knot
Fruit and thinking are right-on, and are used widely in 2016 in annual production process, 3 conditions of blast furnace are very steady
It is fixed.
4）The importance of coke M40 support frames effect is upgraded, and coke M40 is that the skeleton function for characterizing coke most has
The data of effect, if M40 is higher, the skeleton function of coke embodies in dryer section to be become apparent, and can obviously reduce the powder of stock column
Amount, it is ensured that this section of gas resistance is minimum.Simultaneously in soft melt zone, resistance to slag iron scouring capability is improved, it is ensured that relatively low gas resistance.
Improved in the damaged ability of the mechanical resistant of tuyere area coke so that gas flow distribution can relatively uniform, bosh gas resistance relatively
It is low.Therefore, coke hot performance is reduced（CSR）While must improve the cold strength of coke（M40）.
2nd, The effect of invention.
2015 were contrasted with the Blending, coke cost and coke quality of 2016, key index in 2016
Improve obvious, be that making up deficits and increasing surpluses for iron and steel enterprise is laid a good foundation.
Coke quality：
2016 use coal in Chinese mugwort pit coal and other boundarys by vast scale, and coke is in addition to CSR is reduced, and remaining index is all more dashed forward
Go out.Wherein M40 whole years, average grade whole year, coke ash was in medium level all greater than 54.45% all greater than 89.0%.
1）Coke is hot（CSR）, see Fig. 1.
Fig. 1 2015 and coke CSR contrasts in 2016.
2016 because in boundary coal use ratio it is higher, conventional characterization method can be seen that CSR significantly lower than 2015, this
It is that coke index belongs to rare in the industry, is maximum innovative point, wherein in March, 2016, minimum up to 23.2%.
2）Coke M40, is shown in Fig. 2.
Fig. 2.M40 average 88.8% in 2015, M40 average 89.5% in 2016.
And coal resource anxiety in 2016, repeatedly occurs fracture, moon coal blending adjustment number of times is more, but by Reasonable adjustment and
Strict process management and control, M40 still stablizes.
3）Coke particle mean size, is shown in Fig. 3.
Coke particle mean size 54.3% in 2016, hence it is evident that the level higher than 2015 53.2%, belongs to best level over the years, favorably
The gas permeability for supporting blast furnace.
3rd, economic benefit
The invention was calculated by 2016 on the basis of single grade coal examination unit price, was carried out by the accumulative proportionings of 2015 and 2016
Adjust, coal consumption in 2016 is 225.3 ten thousand tons, reject the influence that coal price lowers factor, coal blending cost amounts to reduction by 21289.4 ten thousand
Member.
Above-mentioned Economic Benefit Accounting is comparatively guarded, and coking coal market price change in 2016 is violent, burnt since June
Coal price lattice fast lifting, arrives or so October, and Shanxi, Mongolia, the coking coal of tortoise transformation are containing tax to about 1800 yuan/ton of factory, according to public affairs
Department's reduction calculation of price, coal blending in 2016 drops this volume and drops this volume far above examination.
4th, the inventive method TECHNICAL SUMMARY.
1）The C blast furnace successful industrial tests in October, 2015.Wherein the indices such as usage factor, coke ratio, burnup are earlier above
Phase smelts the production that mode is applied to A, B blast furnace for a long time in whole year in 2016, furnace condition anterograde, molten iron compared to stabilization
Cost is significantly reduced；
2）By the use of annual low-heat state coke in 2016, break the burnt technology of blast furnace and confined, the low CSR of conventional detection
Coke can ensure 2500m completely3The stable smooth operation of blast furnace.There is mistake in the evaluation method for also having confirmed conventional coke hot performance
Area, can not characterize heating process of the coke in blast furnace well, and 1300 DEG C -1500 DEG C of the reaction temperature in blast furnace
Under the conditions of come detect eight steel coke CRI and CSR just it is representative, can more characterize hot effect of the coke in blast furnace.
3）With the lifting of coal amount of allocating in boundary, coke M40 rises show that coal is to cold strength in Chinese mugwort pit coal and other boundarys
Lifting than advantageous, this is the unique property of coal in boundary；
4）With CSR reduction, 2500m3Requirement of the blast furnace to M40 is improved, from the point of view of blast furnace production process in 2016, and M40 >=
89% is most basic, the minimum quality requirement of smooth operation of furnace.
5）Chinese mugwort pit coal is used completely within 2016, breach long-term Chinese mugwort pit coal can not use at high proportion, the limited production of 1890 coals
Quagmire, annual coal blending cost amounts to 21289.4 ten thousand yuan of reduction, is that making up deficits and increasing surpluses for eight steel enterprises has established solid technology base
Plinth.
The inventive method, has effectively broken technology routine, has breached technology confinement, improves low-heat state, inexpensive coking
With the usage amount of coal, coke cost is reduced, to improve the competitiveness and economic benefit of iron and steel enterprise, and will be in iron and steel enterprise
In earn widespread respect, practical significance is outstanding.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is described in further detail
Fig. 1 schemes for coke CSR of the present invention；
Fig. 2 schemes for coke M40 of the present invention；
Fig. 3 is coke particle mean size figure of the present invention.
Embodiment
A kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion, including following operating procedure：
A, holding rich-oxygen of blast furnace rate are 5%, and it is 4600Nm to keep the blast furnace feeding blow rate required3/ min, maintains furnace processor 5150t not
Become, adjust gas flowrate in bosh, make its numeric ratio 2500m3Low 300 Nm of gas flowrate in bosh during the normal working of a furnace of blast furnace3/min；
B, diminution air port area, make it than the normal blast furnace operating air port small 0.015m of area2--0.02m2, it is ensured that wind speed exists
265m/s or so, blast energy is in 11000kgm/s or so；
2180-2230 DEG C suitable of theoretical tuyere combustion temperature of c, maintenance, keeps wind-warm syndrome to 1130--1170 DEG C, improves wet
Divide 20-30g/t；
D, high-coal ratio is carried to 150kg/t, coke ratio remains unchanged, improve fuel ratio to 565kg/t, it is ensured that suitable coal gas amount, stove
Top temperature is not less than 120 DEG C；
E, adjustment burden distribution system and ore deposit batch weight, cloth pattern, ore deposit criticizes 62t-64t, warm according to top, adjusts in proportion
Ore deposit coke (per) charge weight, it is ensured that blast furnace center and blast furnace edge twice Gas Flow；
Grasp the formulation of smelting system：
A, gas flowrate in bosh cannot be less than 5900m3/h；
B, furnace temperature adjustment order：The gain of heat：Coal-humidification -- wind-warm syndrome-coke；Reduction of heat：Humidification-wind-warm syndrome -- subtract coal-coke；Iron
Coolant-temperature gage PT is at least 1500 DEG C；
C, top temperature control system：If two 5 batch of material times are more than 2500m3Regulation material speed during the normal working of a furnace of blast furnace, top temperature is descending, then
Subtract the m of oxygen 10003/h -2000 m3/ h, action will have lead in the control of top temperature, that is, push up temperature control system at 120-150 DEG C, even
The continuous warm average value in two hours top decrease beyond 20 DEG C, slightly control material speed, subtracts the m of oxygen 10003/h -2000 m3/h；
D, guarantee CCT1/CCT2 temperature strengthen central gas stream, its adjustment order at 470 DEG C/350 DEG C：Stockline -- cloth pattern,
Stockline adjusts 0.1-0.2m, if big change does not occur for four hour air-flows, adjusts cloth pattern, cloth is adjusted on gear
The number of turns 0.5-1 is enclosed；
E, guarantee Tf value≤2250 DEG C.
Claims (1)
1. a kind of production technology that large blast furnace coke is refined with low-heat state coal at high proportion, it is characterised in that including following operation step
Suddenly：
A, holding rich-oxygen of blast furnace rate are 5%, and it is 4600Nm to keep the blast furnace feeding blow rate required3/ min, maintains furnace processor 5150t not
Become, adjust gas flowrate in bosh, make its numeric ratio 2500m3Low 300 Nm of gas flowrate in bosh during the normal working of a furnace of blast furnace3/min；
B, diminution air port area, make it than the normal blast furnace operating air port small 0.015m of area2--0.02m2, it is ensured that wind speed is in 265m/
S or so, blast energy is in 11000kgm/s or so；
2180-2230 DEG C suitable of theoretical tuyere combustion temperature of c, maintenance, keeps wind-warm syndrome to 1130--1170 DEG C, improves wet
Divide 20-30g/t；
D, high-coal ratio is carried to 150kg/t, coke ratio remains unchanged, improve fuel ratio to 565kg/t, it is ensured that suitable coal gas amount, stove
Top temperature is not less than 120 DEG C；
E, adjustment burden distribution system and ore deposit batch weight, cloth pattern, ore deposit criticizes 62t-64t, warm according to top, adjusts in proportion
Whole ore deposit coke (per) charge weight, it is ensured that blast furnace center and blast furnace edge twice Gas Flow；
Grasp the formulation of smelting system：
A, gas flowrate in bosh cannot be less than 5900m3/h；
B, furnace temperature adjustment order：The gain of heat：Coal-humidification -- wind-warm syndrome-coke；Reduction of heat：Humidification-wind-warm syndrome -- subtract coal-coke；Iron
Coolant-temperature gage PT is at least 1500 DEG C；
C, top temperature control system：If two 5 batch of material times are more than 2500m3Regulation material speed during the normal working of a furnace of blast furnace, top temperature is descending, then subtracts
The m of oxygen 10003/h -2000 m3/ h, action will have lead in the control of top temperature, that is, push up temperature control system at 120-150 DEG C, continuously
Two warm average values in hour top decrease beyond 20 DEG C, slightly control material speed, subtract the m of oxygen 10003/h -2000 m3/h；
D, guarantee CCT1/CCT2 temperature strengthen central gas stream, its adjustment order at 470 DEG C/350 DEG C：Stockline -- cloth pattern,
Stockline adjusts 0.1-0.2m, if big change does not occur for four hour air-flows, adjusts cloth pattern, cloth is adjusted on gear
The number of turns 0.5-1 is enclosed；
E, guarantee Tf value≤2250 DEG C.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108359760A (en) * | 2017-10-24 | 2018-08-03 | 新疆八钢铁股份有限公司 | Large blast furnace maintains the operating procedure of direct motion using low-heat state strength coke |
| CN108504801A (en) * | 2018-04-28 | 2018-09-07 | 首钢京唐钢铁联合有限责任公司 | A kind of subtract when stopping oxygen processing method under the high oxygen-rich smelting of blast furnace heavy load |
| CN109242345A (en) * | 2018-10-10 | 2019-01-18 | 鞍钢股份有限公司 | A kind of determination method of charge weight during blast furnace material distribution |
| CN109988590A (en) * | 2017-12-29 | 2019-07-09 | 新疆八一钢铁股份有限公司 | A kind of large blast furnace uses the smelting process of low-heat state strength coke |
| CN110541052A (en) * | 2019-08-22 | 2019-12-06 | 六安钢铁控股集团特钢有限公司 | Blast furnace iron-making method using secondary coke in large proportion |
| CN114107584A (en) * | 2021-11-25 | 2022-03-01 | 江苏沙钢集团有限公司 | Secondary coping method for low-furnace-temperature sliding material of blast furnace |
| CN115466808A (en) * | 2022-09-19 | 2022-12-13 | 武安市裕华钢铁有限公司 | Blast furnace smelting method with high oxygen enrichment and large slag quantity |
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2017
- 2017-02-17 CN CN201710086887.4A patent/CN106987665A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108359760A (en) * | 2017-10-24 | 2018-08-03 | 新疆八钢铁股份有限公司 | Large blast furnace maintains the operating procedure of direct motion using low-heat state strength coke |
| CN109988590A (en) * | 2017-12-29 | 2019-07-09 | 新疆八一钢铁股份有限公司 | A kind of large blast furnace uses the smelting process of low-heat state strength coke |
| CN108504801A (en) * | 2018-04-28 | 2018-09-07 | 首钢京唐钢铁联合有限责任公司 | A kind of subtract when stopping oxygen processing method under the high oxygen-rich smelting of blast furnace heavy load |
| CN109242345A (en) * | 2018-10-10 | 2019-01-18 | 鞍钢股份有限公司 | A kind of determination method of charge weight during blast furnace material distribution |
| CN110541052A (en) * | 2019-08-22 | 2019-12-06 | 六安钢铁控股集团特钢有限公司 | Blast furnace iron-making method using secondary coke in large proportion |
| CN110541052B (en) * | 2019-08-22 | 2022-04-12 | 安徽首矿大昌金属材料有限公司 | Blast furnace iron-making method using secondary coke in large proportion |
| CN114107584A (en) * | 2021-11-25 | 2022-03-01 | 江苏沙钢集团有限公司 | Secondary coping method for low-furnace-temperature sliding material of blast furnace |
| CN114107584B (en) * | 2021-11-25 | 2023-02-03 | 江苏沙钢集团有限公司 | Secondary coping method for low-furnace-temperature sliding material of blast furnace |
| CN115466808A (en) * | 2022-09-19 | 2022-12-13 | 武安市裕华钢铁有限公司 | Blast furnace smelting method with high oxygen enrichment and large slag quantity |
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