CN107674936A - A kind of control method for the slag sluicing system for smelting titaniferous molten iron converter terminal - Google Patents
A kind of control method for the slag sluicing system for smelting titaniferous molten iron converter terminal Download PDFInfo
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- CN107674936A CN107674936A CN201710949258.XA CN201710949258A CN107674936A CN 107674936 A CN107674936 A CN 107674936A CN 201710949258 A CN201710949258 A CN 201710949258A CN 107674936 A CN107674936 A CN 107674936A
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- slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
Abstract
A kind of control method of converter smelting titaniferous molten iron converter terminal slag sluicing system, belongs to steelmaking technical field.Using the slag making mode based on active lime and ore, active ash requires effective CaO content >=85%.Converter stays slag+single-slag practice method using selectivity, and remained converter slag amount carries out remaining slag operation according to the 1/2~1/3 of total quantity of slag, and converter charge weight is produced by the steel scrap pattern of 90% molten iron+10%.Converter smelting specific operation process is divided into two parts：Part I operates for converter smelting slag making；Part II operates for tapping process slag sluicing system.Advantage is, the converter smelting pre-slag for solving high phosphorus titaniferous molten iron is excessively viscous, slag sluicing system effect is poor, the problem of mid-early stage slag dephosphorization effect difference, realizes that converter smelting protects the purpose of carbon tapping, removes titanium in molten steel and largely enter clinker, converter finishing slag TiO2Content 3.6~5.0%.
Description
Technical field
The invention belongs to steelmaking technical field, more particularly to a kind of slag-iron separation for smelting titaniferous molten iron converter terminal
Control method.
Background technology
Due to the particularity of V and Ti in iron-based system, there is very big shadow to the removing for making steel follow-up sulphur, phosphorus
Ring.Source investigation shows, determines V in weak solution according to Wagner Act, Ti elements are to S and H interaction coefficient, and Ti and V are
It is the activity of S and H in strong reduction iron liquid, is effective concentration reduction, this removing to S and H in steelmaking process has non-
Often big influence (see Fig. 1, Fig. 2).Influence of (1827k) each element to iron liquid viscosity in Fig. 3 Fe-base multielement systems.Wherein, V and
Ta influences the most obvious, and Nb and Ti also have and stronger make the increased effect of molten steel viscosity.Fig. 4 is each element in Fe-base multielement system
Influence to iron liquid surface tension.Wherein, O, S, N can strongly reduce surface tension, and Mn also plays the role of to reduce more by force, Si,
Cr, C and P surface-active is not high, and Ti, V, Mo are non-surface active elements, and wherein Ti is most inactive in known element
Element.
As can be seen here, molten iron of the total amount less than 0.5% is accounted for containing V and Ti trace elements, according to the metallurgical weak solution of materialization 1%
From the point of view of influencing each other between analytical element, the reduction of S, H activity is directly resulted in；The viscosity increase of iron liquid；The increase of iron liquid surface tension,
Reduce the effective area of reaction interface between slag-gold.These factors, the removing to the harmful element in steelmaking process can cause compared with
Big influence.
The Ti content of normal molten iron does not influence 0.10% or so on converter smelting.Titaniferous, chromium, vanadium are being smelted in converter
During the high temperature elements such as the molten iron (Ti (0.10~0.50%), Cr (0.10~0.20%), V (0.05~0.10%)) Deng element,
Especially high phosphorus, high-titanium molten iron (P >=0.12%；Ti >=0.20%) when, converter pre-slag is excessively viscous, slag sluicing system effect is poor, in before
Phase slag dephosphorization effect is poor；Converter later stage dephosphorization burden weight, if misoperation splash often occurs and coheres the accidents such as viscous rifle, steel
Material consumption technical indicator deteriorates；Finishing slag oxidisability is high, corrodes furnace bottom, and slag splashing effect difference and furnace life reduction etc. are a series of to ask
Topic, seriously affect the production normal operation of converter.
Molten iron (P >=0.12% of high phosphorus, high titanium；Ti >=0.20%) smelt the high-carbon steel that phosphorus content is more than more than 0.60%
When, one side converter dephosphorization early stage burden is big, on the other hand removes most titanium again, to realize that converter terminal protects carbon tapping
The task of (tapping carbon 0.15-40%), temperature meet that tapping requires again, and operation difficulty is big.Influenceed by high titanium, chromium hot melt,
Converter slugging condition is deteriorated, and when outlet temperature is high and carbon content of molten steel is higher, being not easy of clinker is saturating, causes terminal clinker to send out
Bubble, tenor are too high (see Fig. 5 and Fig. 6).
A kind of method of producing high carbon steel by high-catching carbon method of Chinese patent literature (CN101333578A), converter with 3.1~
3.4Nm3/ min/t oxygen supply intensities blow, using constant flow, the oxygen supply system of change rifle position, using active lime and ore as slag making
Agent, blow it is whole use higher rifle position, open the rifle position system for blowing to and terminating using drop rifle paragraph by paragraph, converter smelting endpoint falls stove and fallen
Slag, sampling detection composition, temperature, tapping carbon content can reach 0.46~0.65%, phosphorus content 0.013~0.014%.This side
Method blowing is whole to use constant oxygen supply intensity, does not account for soft blow operation to the advantage of low temperature dephosphorization early stage, no big flow
Bottom blowing stirring, still there are a large amount of rich phosphorus slags to stay in stove after the latter stage deslagging of falling stove of blowing.Therefore, tapping process can produce more serious
Rephosphorization problem, the patent can not solve titaniferous molten iron smelting the later stage slag sluicing system difficult problem.
The content of the invention
It is an object of the invention to provide a kind of control method of slag of converter smelting titaniferous molten iron terminal-iron separation, institute
The chemical component weight percentage for the titaniferous molten iron stated is C：4.20~6.80%, Si：0.30~0.70%；Mn：0.30~
0.70%；P：0.12~0.15%；S：0.02~0.07%；Ti：0.20~0.50%；Cr：0.10~0.20%, surplus is
Fe；Converter stays slag+single-slag practice method using selectivity, and converter charge weight is produced by the steel scrap pattern of 90% molten iron+10%.Solution
Certainly the converter smelting pre-slag of high phosphorus titaniferous chromium hot melt is excessively viscous, slag sluicing system effect is poor, the problem of mid-early stage slag dephosphorization effect difference,
Realize converter smelting slag-iron separation, converter finishing slag TiO2Content 3.6~5.0%.Using the slag making based on active lime and ore
Mode, active ash require effective CaO content >=85%.Converter stays slag+single-slag practice method using selectivity, and converter charge weight is pressed
The steel scrap pattern of 90% molten iron+10% is produced.Converter smelting specific operation process is divided into two parts：Part I is converter smelting
Refining operation；Part II is tapping process slag-iron lock out operation.
Technical solution of the present invention is carried out using following steps：
Part I：Pneumatic steelmaking slagging regime operates
Silicon, titanium, the content of phosphorus in molten iron, targetedly change burden structure, and carbon is protected to the dephosphorization in converter later stage
Operate most important.Silicon in the silicone content molten iron of titaniferous molten iron is not the main heating source of pneumatic steelmaking,
Formed for the furnace charge of low silicon titaniferous molten iron Si≤0.30%, increase by 4.5~5 tons of the addition of molten iron, increase low alkali
The dosage of degree auxiliary slag former, the sludge ball total amount per stove add according to 1600~1800kg, 1000~1200kg of sinter return fine,
Total addition of cold burden controls according to 2500~3000kg amount；
Conventional titaniferous molten iron Si>0.30% furnace charge is formed, and increases the addition of steel scrap, per stove sludge ball total amount according to 800
~1000kg, 1800~2000kg of sinter return fine；Total addition of cold burden controls according to 3500~4000kg amount.
The converter slag-making system of table 1 performs table
Part II：Tapping process slag sluicing system operates
(1) the terminal operation of falling stove：Temperature is by 1590 DEG C~1640 DEG C controls, and tapping carbon content is by 0.15%~0.35% control
System, terminal 60~90 seconds rifle time of pressure, 800~1200mm of pressure rifle rifle position；
2) the foam in hibitors control of falling stove clinker foamed is used, improves terminal oxygen supply intensity by 3.1Nm3/ min/t is improved
To 3.3Nm3/ min/t pressed rifle to 30 seconds, and the process of falling stove adds 40~60kg light dolomites and carries out artificial pressure slag；Fallen carrying rifle
Stove, lift stove use N to slag after 5000~7000mm height is purged 5~8 seconds with nitrogen2Carry out purging turning over for pressed-steel liquid level
Rise；
3) deslagging grate technique：Deslagging fascinates body of heater to 75 °~80 ° positions after starting, and is kept for 3~5 seconds in the angle
Afterwards, then slow grate is to 84 °~85 ° positions, outwells high content TiO2Clinker, control converter finishing slag TiO2Content is maintained at
Less than 3%；
4) after steel scrap addition, grate reduces the pig iron and is bonded at converter top of the slag amount, iron block, which splashes down, leads to 310~315 ° backward
Cause seething for molten steel.
The advantage of the invention is that：The oxygen rifle soft blow technique of first stage is mutually tied with the larger oxygen flow of second stage
Close, not only improved dephosphorization rate but also improved efficiency；Early stage can enliven clinker using soft blow operation, improve clinker and take off
The ability of phosphorus, de- titanium；Using larger bottom blowing flow slag can be made fully to contact, good dynamics bar is provided for dephosphorization
Part；The pressure slag operation terminated is smelted, promotes the pearl iron at steel, slag interface to separate as soon as possible.
It is 0.15~0.35% that converter terminal, which controls carbon content, and end phosphorus content≤0.015%, temperature meets that tapping will
Ask, meet that clinker pearl-iron separation is clean.The dephosphorization effect of converter single-slag practice can meet tapping steel with high carbon up to 88~92%
Requirements of the Shi Gangshui to phosphorus content, elimination titaniferous molten iron smelting pre-slag is viscous, slag sluicing system effect difference problem, realizes converter smelting
Protect the purpose of carbon tapping.
Brief description of the drawings
Element influences figure to S activity coefficient in Fig. 1 steel.
Element influences figure to H activity coefficient in Fig. 2 steel.
Influence figure of the element to iron liquid viscosity in Fig. 3 steel.
Influence figure of the element to iron liquid surface tension in Fig. 4 steel.
Fig. 5 is a kind of slag-iron not separate section clinker photo figure.
Fig. 6 is another slag-iron not separate section clinker photo figure.
Fig. 7 is slag-iron separate section clinker photo.
Embodiment
To clearly demonstrate the smelting main points of the present invention and its implementation result, there is provided the embodiment of 100 tons of converter smeltings
And implementation result.
Embodiment 1：
Molten iron condition：C：4.20%；Si：0.30%；Mn：0.36%；P：0.12%；S：0.02%；Ti：0.20%；Cr：
0.10%；V：0.07%；, surplus Fe；Temperature：1360℃.
Converter loads system：+ 5 tons of steel scraps of 95 tons of molten iron.
Converter operates：First stage uses 3.1Nm3/ min/t oxygen supply intensity blowing, opens and blows 1.8 meters of rifle position, process rifle
1.8 meters of position, 0~3 minute time.Open after blowing in 1 minute added into converter 2.2 tons of lime (25 kgs/tonne of steel), 0.6 ton
2.0 tons of ores (23kg/ tons steel) of light dolomite (7kg/ tons steel), bottom blowing nitrogen flow is 0.1Nm3/min/t；Process rifle
1.6 meters of position, 3~6 minutes time, open and add 0.6 ton of lime (7 kgs/tonne of steel), 1.0 tons of ores after blowing in backward converter in 4 minutes
(13kg/ tons steel)；1.2 meters of process rifle position, minute time 6-10, open and add 0.5 ton of ore after blowing in backward converter in 10 minutes
(6kg/ tons steel)；1.0 meters of process rifle position, 11~13 minutes time, the previous minute oxygen supply intensity of finishing blowing is by 3.1Nm3/min/
T brings up to 3.3Nm3/ min/t, 48kg light dolomites were added at 30 seconds 12 minutes.
The operation of falling stove：When proposing rifle deslagging in 6000mm height, oxygen rifle with nitrogen purge 3 seconds after fall stove, use N2Blown
Sweep seething for pressed-steel liquid level；Deslagging fascinates body of heater to 77 ° of positions after starting, and after being kept for 4 seconds, then slow grate is to 84 ° of positions
Put, not deslagging.
Converter tapping terminal：C：0.20%, P：0.012%, 1610 DEG C of temperature；
The converter slag composition of table 1 (total amount should meet 100%)
| Tfe, % | P2O5, % | S, % | Al2O3, % | TiO2, % | Pearl iron, % | CaO+SiO2+ FeO, % |
| 14.02 | 2.90 | 0.15 | 0.83 | 3.88 | 1.56 | 76.48 |
Embodiment 2：
Molten iron condition：C：5.26%；Si：0.25%；Mn：0.46%；P：0.13%；S：0.012%；Ti：0.34%；
Cr：0.12%；V：0.06%, surplus Fe；；Temperature：1375℃.
Converter loads system：+ 9.5 tons of steel scraps of 90.5 tons of molten iron.
Converter operates：First stage uses 3.1Nm3/ min/t oxygen supply intensity blowing, opens and blows 1.8 meters of rifle position, process rifle
1.8 meters of position, 0~3 minute time.Open after blowing in 1 minute added into converter 2.4 tons of lime (28 kgs/tonne of steel), 0.6 ton
2.0 tons of ores (23kg/ tons steel) of light dolomite (7kg/ tons steel), bottom blowing nitrogen flow is 0.1Nm3/min/t；Process rifle
1.6 meters of position, minute time 3-6, open and add 0.8 ton of lime (12 kgs/tonne of steel), 1.0 tons of ores after blowing in backward converter in 4 minutes
(13kg/ tons steel)；1.2 meters of process rifle position, minute time 6-10, open and add 0.5 ton of ore after blowing in backward converter in 10 minutes
(6kg/ tons steel)；1.0 meters of process rifle position, 11~13 minutes time, the previous minute oxygen supply intensity of finishing blowing is by 3.1Nm3/min/
T brings up to 3.3Nm3/ min/t, 49kg light dolomites were added at 28 seconds 12 minutes.
The operation of falling stove：When proposing rifle deslagging in 6500mm height, oxygen rifle with nitrogen purge 4 seconds after fall stove, use N2Blown
Sweep seething for pressed-steel liquid level；Deslagging fascinates body of heater to 75 ° of positions after starting, and after being kept for 4 seconds, then slow grate is to 84 ° of positions
Put, outwell high content TiO as early as possible2Clinker, account for 1/2 quantity of slag of total amount.
Converter tapping terminal：C：0.20%, P：0.013%, 1617 DEG C of temperature；
The converter slag composition of table 2
| Tfe, % | P2O5, % | S, % | Al2O3, % | TiO2, % | Pearl iron, % | CaO+SiO2+ FeO, % |
| 16.36 | 3.15 | 0.16 | 0.85 | 4.56 | 0.98 | 73.93 |
Embodiment 3：
Molten iron condition：C：6.20%；Si：0.27%；Mn：0.29%；P：0.14%；S：0.06%；Ti：0.25%；Cr：
0.15%；V：0.05%, surplus Fe；；Temperature：1366℃.
Converter loads system：+ 5 tons of steel scraps of 95 tons of molten iron.
Converter operates：First stage uses 3.1Nm3/ min/t oxygen supply intensity blowing, opens and blows 1.8 meters of rifle position, process rifle
1.8 meters of position, 0~3 minute time.Open after blowing in 1 minute added into converter 2.2 tons of lime (14 kgs/tonne of steel), 0.6 ton
2.0 tons of ores (23kg/ tons steel) of light dolomite (7kg/ tons steel), bottom blowing nitrogen flow is 0.1Nm3/min/t；Process rifle
1.6 meters of position, 3~6 minutes time, open and add 0.6 ton of lime (7 kgs/tonne of steel), 2.0 tons of ores after blowing in backward converter in 4 minutes
(26kg/ tons steel)；1.2 meters of process rifle position, minute time 6-10, open and add 0.5 ton of ore after blowing in backward converter in 10 minutes
(6kg/ tons steel)；1.0 meters of process rifle position, 11~13 minutes time, the previous minute oxygen supply intensity of finishing blowing is by 3.1Nm3/min/
T brings up to 3.3Nm3/ min/t, 50kg light dolomites were added at 30 seconds 12 minutes.
The operation of falling stove：When proposing rifle deslagging in 6600mm height, oxygen rifle with nitrogen purge 7 seconds after fall stove, use N2Blown
Sweep seething for pressed-steel liquid level；Deslagging fascinates body of heater to 75 ° of positions after starting, and after being kept for 4 seconds, then slow grate is to 84 ° of positions
Put, outwell high content TiO as early as possible2Clinker, account for 1/2 quantity of slag of total amount.
Converter tapping terminal：C：0.26%, P：0.012%, 1600 DEG C of temperature；
The converter slag composition of table 3 (total amount should meet 100%)
| Tfe, % | P2O5, % | S, % | Al2O3, % | TiO2, % | Pearl iron, % | CaO+SiO2+ FeO, % |
| 14.02 | 2.90 | 0.15 | 0.83 | 4.68 | 1.34 | 76.08 |
Embodiment 4：
Molten iron condition：C：6.80%；Si：0.70%；Mn：0.66%；P：0.15%；S：0.07%；Ti：0.49%；Cr：
0.20%；V：0.07%, surplus Fe；；Temperature：1360℃.
Converter loads system：+ 7 tons of steel scraps of 93 tons of molten iron.
Converter operates：First stage uses 3.1Nm3/ min/t oxygen supply intensity blowing, opens and blows 1.8 meters of rifle position, process rifle
1.8 meters of position, minute time 0-3.Open after blowing in 1 minute and 2.2 tons of lime (26 kgs/tonne of steel), 1.2 tons light are added into converter
2.0 tons of ores (23kg/ tons steel) of calcined dolomite (14kg/ tons steel), bottom blowing nitrogen flow is 0.1Nm3/min/t；Process rifle position
1.6 meters, minute time 3-6, open and add 0.6 ton of lime (14 kgs/tonne of steel), 1.0 tons of ores after blowing in backward converter in 4 minutes
(13kg/ tons steel)；1.2 meters of process rifle position, minute time 6-10, open and add 0.5 ton of ore after blowing in backward converter in 10 minutes
(6kg/ tons steel)；1.0 meters of process rifle position, 11~13 minutes time, the previous minute oxygen supply intensity of finishing blowing is by 3.1Nm3/min/
T brings up to 3.3Nm3/ min/t, 50kg light dolomites were added at 30 seconds 12 minutes.
The operation of falling stove：When proposing rifle deslagging in 7000mm height, oxygen rifle with nitrogen purge 8 seconds after fall stove, use N2Blown
Sweep seething for pressed-steel liquid level；Deslagging fascinates body of heater to 75 ° of positions after starting, and after being kept for 3 seconds, then slow grate is to 84 ° of positions
Put, outwell high content TiO as early as possible2Clinker, stay the quantity of slag according to 1/3 retain the quantity of slag.
Converter tapping terminal：C：0.30%, P：0.015%, 1610 DEG C of temperature；
The converter slag composition of table 4：(total amount should meet 100%)
| Tfe, % | P2O5, % | S, % | Al2O3, % | TiO2, % | Pearl iron, % | CaO+SiO2+FeO, % |
| 16.88 | 3.26 | 0.15 | 0.78 | 4.98 | 1.67 | 72.28 |
Claims (1)
1. a kind of control method for the slag-iron separation for smelting titaniferous molten iron converter terminal, the chemical composition of described titaniferous molten iron
Percetage by weight is C：4.20~6.80%, Si：0.30~0.70%；Mn：0.30~0.70%；P：0.12~0.15%；S：
0.02~0.07%；Ti：0.20~0.50%；Cr：0.10~0.20%, surplus Fe；Converter stays slag+mono- slag using selectivity
Maneuver, converter charge weight are produced by the steel scrap pattern of 90% molten iron+10%；Characterized in that, processing step and control
Technical parameter is as follows：
(1) pneumatic steelmaking slag making
Formed for the furnace charge of low silicon titaniferous molten iron Si≤0.30%, increase the addition 4.5-5 tons of molten iron, increase low alkalinity auxiliary
The dosage of slag former, the sludge ball total amount per stove add according to 1600~1800kg, 1000~1200kg of sinter return fine, cold burden
Total addition controls according to 2500~3000kg amount；
Titaniferous molten iron Si>0.30% furnace charge is formed, and increases the addition of steel scrap, per stove sludge ball total amount according to 800~1000kg,
1800~2000kg of sinter return fine；Total addition of cold burden controls according to 3500~4000kg amount；
(2) slag sluicing system：
1) the terminal operation of falling stove：Temperature is controlled by 1590 DEG C~1640 DEG C controls, tapping carbon content by 0.15%~0.35%, eventually
Press the rifle time 60~90 seconds, 800~1200mm of pressure rifle rifle position；
2) the foam in hibitors control of falling stove clinker foamed is used, improves terminal oxygen supply intensity by 3.1Nm3/ min/t is brought up to
3.3Nm3/ min/t pressed rifle to 30 seconds, and the process of falling stove adds 30-50kg light dolomites and carries out artificial pressure slag；Exist proposing rifle deslagging
Stove, lift stove use N after 5000~7000mm height is purged 5~8 seconds with nitrogen2Carry out purging seething for pressed-steel liquid level；
3) deslagging grate technique：Deslagging fascinates body of heater to 75 °~80 ° positions after starting, after the angle is kept for 3~5 seconds, then
Slow grate outwells high content TiO to 84 °~85 ° positions2Clinker, control converter finishing slag TiO2Content be maintained at 3% with
Under；
4) after steel scrap addition, grate is to 310-315 ° backward.
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Cited By (7)
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| CN108998620A (en) * | 2018-09-27 | 2018-12-14 | 马鞍山钢铁股份有限公司 | A kind of slag-iron separation method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN110322057A (en) * | 2019-06-20 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | A kind of forecasting system and prediction technique of 100t direct current electric arc furnace tapping carbon component |
| CN112322825A (en) * | 2020-10-26 | 2021-02-05 | 北京首钢股份有限公司 | Method for reducing total iron content of semisteel furnace slag |
| CN112708716A (en) * | 2020-12-08 | 2021-04-27 | 首钢集团有限公司 | Production method for rapidly increasing temperature of large scrap ratio of titanium-containing molten iron converter |
| CN113337662A (en) * | 2021-05-13 | 2021-09-03 | 首钢水城钢铁（集团）有限责任公司 | Method for improving dephosphorization effect of titanium-containing high-phosphorus molten iron converter in dephosphorization period |
| CN113801973A (en) * | 2021-08-17 | 2021-12-17 | 首钢集团有限公司 | Smelting method for converter steel slag resource production |
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| JP2004277830A (en) * | 2003-03-17 | 2004-10-07 | Sumitomo Metal Ind Ltd | Steelmaking method in converter |
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| CN108998620A (en) * | 2018-09-27 | 2018-12-14 | 马鞍山钢铁股份有限公司 | A kind of slag-iron separation method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN110322057A (en) * | 2019-06-20 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | A kind of forecasting system and prediction technique of 100t direct current electric arc furnace tapping carbon component |
| CN112322825A (en) * | 2020-10-26 | 2021-02-05 | 北京首钢股份有限公司 | Method for reducing total iron content of semisteel furnace slag |
| CN112322825B (en) * | 2020-10-26 | 2022-07-15 | 北京首钢股份有限公司 | Method for reducing total iron content of semisteel furnace slag |
| CN112708716A (en) * | 2020-12-08 | 2021-04-27 | 首钢集团有限公司 | Production method for rapidly increasing temperature of large scrap ratio of titanium-containing molten iron converter |
| CN113337662A (en) * | 2021-05-13 | 2021-09-03 | 首钢水城钢铁（集团）有限责任公司 | Method for improving dephosphorization effect of titanium-containing high-phosphorus molten iron converter in dephosphorization period |
| CN113337662B (en) * | 2021-05-13 | 2022-05-20 | 首钢水城钢铁（集团）有限责任公司 | Method for improving dephosphorization effect of titanium-containing high-phosphorus molten iron converter in dephosphorization period |
| CN113801973A (en) * | 2021-08-17 | 2021-12-17 | 首钢集团有限公司 | Smelting method for converter steel slag resource production |
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