CN103773919A - Method for smelting middle-high phosphorus molten iron in converter - Google Patents
Method for smelting middle-high phosphorus molten iron in converter Download PDFInfo
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Abstract
The invention provides a method for smelting middle-high phosphorus molten iron in converter and belongs to the technical field of steel making. The method is characterized in that the smelting process in the converter comprises a molten iron silicon and phosphorous removal pretreatment period and a little slag smelting decarburization period, wherein the target of the molten iron silicon and phosphorous removal pretreatment period is as follows: [C]=2.9-3.8%, T=1330-1400 DEG C, and the phosphorous removal rate is 70%-95%; and the target of the little slag smelting decarburization period is as follows: [C]=0.03-0.5% and T=1550-1720 DEG C; the molten iron phosphorous removal rate after treatment in the molten iron silicon and phosphorous removal pretreatment period reaches 70%-95%; lime powder is sprayed into a molten pool, so that the lime powder is in full contact with molten steel, and the phosphorous removal reaction in steel slag is promoted; oxygen/nitrogen mixed gas in various proportions is used or carrying out mixed injection on the molten pool, and the rapid temperature increase of the molten pool, possibly caused by pure oxygen top blowing, is avoided; a large airflow converter molten pool stirring technology is used for further improving the stirring effect of the molten pool in the converter blowing earlier stage; deslagging is carried at a proper opportunity in the middle; and after blowing is ended, slag reservation operation is adopted in due time, and the total phosphorus removal rate of the high phosphorus molten iron is above 90% through the measures.
Description
Technical field
The invention belongs to steelmaking technical field, particularly relate to the method for the middle and high ferrophosphorus water of a kind of converter smelting, can meet the requirement of finished product molten steel phosphorus content.
Background technology
For meeting the requirement of converter low cost production Clean Steel, people carry out system analysis to Steel Production Flow Chart.There is the development trend that complicated steelmaking process is divided into some processing steps such as desulfurizing iron pre-treatment, converter desiliconization in early stage, dephosphorization, middle deslagging, few slag decarburization intensification, control blow end point hit rate and tapping steel, slag splashing, remaining slag operation, be intended to guarantee under the prerequisite of Cleanliness of Molten Steel raising, further reduce the consumption of the various raw materials of smelting process, reduce the quantity of slag, reduce production costs.
The dephosphorization rate of current conventional converter steelmaking in normal smelting cycle can approach 90%, for general smelting steel grade, as long as molten steel phosphorus content can be controlled at below 0.015% when converter tapping, this means that the phosphorus content of the receptible molten iron of steel-making converter (or iron-bearing material) must be lower than 0.15%.Exceed 0.15% if enter the phosphorus content of the molten iron (or iron-bearing material) of converter, require converter steelmaking process must possess the ability of further raising dephosphorization rate, otherwise, can not meet the requirement of production acceptable quality molten steel.If integrated by correlation technique, meeting under the prerequisite of the normal rhythm of production steady running of existing converter, the dephosphorization rate of converter steelmaking process further can be increased substantially to (as dephosphorization rate is greater than 97%), mean that steel-making converter can accept the molten iron of middle and high phosphorus content (or iron-bearing material) steel-making, blast furnace can be accepted the lower quality feedstocks that phosphorus content is higher, thereby reduces full-range production cost.But current most converter wouldn't possess the ability that further increases substantially dephosphorization rate.
According to above-mentioned thinking, existing convertor steelmaking process is resolved to desiliconization in early stage, dephosphorization, middle deslagging, decarburization intensification and controls some processing steps such as blow end point hit rate and tapping steel, various integrated being applied in convertor steelmaking process of technology that are conducive to converter desiliconization in early stage, dephosphorization, make convertor steelmaking process possess the ability that further increases substantially dephosphorization rate, can accept the molten iron that phosphorus content is higher (or iron-bearing material).For converter dephosphorization, to further increase substantially the dephosphorization rate of converter steelmaking, the reasonable control of bessemerizing early stage bath temperature and slagging process is most important, also will possess special dynamic conditions, guarantees that dephosphorization partial potential best between slag and molten metal is not fully exerted.If the control of Primary period bath temperature or slagging course is unreasonable or unstable, converter smelting does not possess special dynamic conditions yet, and the dephosphorization rate of whole converting process is difficult to further significantly promote.
In the normal converting process of converter, under the substantially constant prerequisite of scrap ratio and cold burden (iron ore, return mine etc.), " soft blow " operation that the method for converter control bath temperature adopts low oxygen pressure, little oxygen flow more and coordinates rifle position to regulate, this principle of operation is suitably to weaken the shock action of Oxygen Flow thigh to molten bath, suppresses the oxidation heat liberation process of various heating elements (iron, carbon, silicon, manganese, phosphorus etc.) in oxygen to directly oxidize molten bath.The oxygen rifle dual-purpose steel-making adopting due to general converter and spatter slag and use, the flow of design is larger, adopt low pressure, that low discharge operation can cause oxygen rifle actual operational parameters to depart from oxygen lance blow head normal design value is more, may there is impact to life-span of oxygen lance, simultaneously, this " soft blow " operation can significantly reduce high velocity gas stream thigh to liquid bath mixing effect, weakens needed reacting dynamics condition in early stage.And early stage desiliconization, dephosphorization blowing process, this dynamic conditions is again one of essential condition of fully occurring of dephosphorisation reaction, this is that one of principal contradiction facing is controlled in converter current steel-making blowing in early stage, be that temperature control and melting bath stirring are inharmonious, cause thus that to bessemerize in best dephosphorization opportunity in early stage the obtainable dephosphorization rate of institute lower, also unstable, therefore, can not accept middle and high ferrophosphorus water (or iron-bearing material phosphorus content 0.2-1.6%) steel-making.The present invention will propose to solve thinking for this contradiction.From existing achievement in research, the means that the treatment process of the high phosphorus hot metal that Liaoning Tianhe Technology Co., Ltd.'s (patent: a kind of high phosphorus hot metal dephosphorization technology) proposes adopts are less, only depend on the dephosphorization effect that adds the method for dephosphorizing agent to be difficult to reach expection; Method for converter molten pool control is too single, dephosphorization effect is not ideal, University of Science & Technology, Beijing's (patent: a kind of winding-up CO
2the method of gas control temperature of steelmaking melting pool of converter, application number: CN200910088822.9); Capital Iron & Steel General Co's (patent: the Low-phosphorus Steel smelting process of the mixed oxygen blast gas of converter Top oxygen-blowing gun and nitrogen, application number: CN201310059482.3), and wuhan iron & steel croup co. (patent: with Wingdale, converter slag is carried out to the cooling dephosphorization of bessemerizing, application number: CN201110080049.9) proposes to bessemerize to add latter stage Wingdale to carry out the measure of bath temperature control.Above measure is too single, can not meet converter and increase substantially in converting process the requirement of dephosphorization rate, and therefore, converter still can not be accepted to make steel with middle and high ferrophosphorus water.
Summary of the invention
The object of the present invention is to provide the method for the middle and high ferrophosphorus water of a kind of converter smelting, combined blown converter has oxygen and nitrogen mix and blow (oxygen, nitrogen winding-up ratio is adjustable), Top and blow and spray lime powder (or Wingdale etc.), atm number bottom blowing agitation molten pool, the slagging route function such as optimization, remaining slag operation in converter Top portion.The present invention, by above-mentioned multiple integrated being applied on combined blown converter of function that is conducive to make steel dephosphorization, realizes the middle and high phosphorus molten iron-steelmaking of efficient, the economic use of combined blown converter.
The present invention is divided into converter smelting pre-treatment period and the less-slag melting carbon period of desiliconization of hot metal, dephosphorization.The target of the pre-treatment period of desiliconization of hot metal, dephosphorization is [C]=2.9～3.8%, T=1330～1400 ℃, and dephosphorization rate is 70～95%; The target of less-slag melting carbon period is [C]=0.03～0.5%, T=1550～1720 ℃.
Open while blowing and add in proportion slag making materials (comprising lime, Wingdale, agglomerate (or pellet) etc.), be blown into oxygen by Top oxygen-blowing gun, converter bottom is blown into nitrogen by bottom blowing ventilated element, and employing tolerance is 0.05～0.4Nm
3the bottom blowing stir mode of/t.min, Primary period sprays into lime powder or limestone powder to molten bath by top rifle, take the flow that dusts as 50～400kg/min formation dephosphorized slag; According to the situation of the temperature in molten bath, in oxygen rifle, sneak into nitrogen to control bath temperature by Top oxygen-blowing gun, control desiliconization of hot metal, the bath temperature of dephosphorizing pretreatment phase are 1330～1390 ℃;
After desiliconization of hot metal, dephosphorizing pretreatment, outwelling the ratio that slag accounts for total dephosphorization quantity of slag is 65～80%; Enter afterwards few slag decarburization temperature raising period, rejoin slag charge, spray into lime powder or limestone powder to molten bath again, employing oxygen supply intensity is 3.5～5.0Nm
3/ t.min oxygen supply decarburization, taps after determining molten steel composition, temperature according to the requirement of steel grade; After tapping, spatter slag, leaving the quantity of slag is 30～50% slag making materialses as next stove of total slag charge; Guarantee that total dephosphorization rate of high phosphorus hot metal in smelting is more than 90%.
The dephosphorization task of centering, high phosphorus hot metal mainly concentrates on the pre-treatment period of desiliconization of hot metal, dephosphorization, this treatment stage dephosphorization rate to reach 70～95%.This treatment stage, the phosphorus content that enters stove molten iron is 0.2～1.6%, determine desiliconization of hot metal, the time of dephosphorization phase according to the difference that enters stove molten iron phosphorus content, after processing, outwell the slag of high phosphorus load in early stage of 65～80%, afterwards, to adding in converter slag former (or continuing winding-up lime powder or limestone powder) again to make new slag, complete the operation that decarburization, intensification, tapping terminal are hit.Desiliconization, dephosphorization phase bath temperature are controlled at 1330～1400 ℃, and basicity of slag is not less than 2.In order to reach the control index of above-mentioned dephosphorization rate, by the integrated application of technology of top blow oxygen lance mixed spray oxygen and nitrogen in this technique, utilize the oxygen/nitrogen mixed gas of different ratios, do not reduce oxygen rifle to the prerequisite of molten bath gas stirring intensity under, mixed injection is carried out in molten bath.Owing to participating in melting bath stirring with a certain proportion of nitrogen, both guaranteed that molten bath possessed good stirring dynamic conditions, can avoid again the bath temperature that may cause with pure oxygen top blast to promote too fast; By integrated being applied in converter of oxygen rifle top blast lime powder (or limestone powder) technology, utilize lime powder (or limestone powder) enter after slag can rapid melting and merge with slag phenomenon, increase substantially the adsorptive power of slag to Vanadium Pentoxide in FLAKES, effectively improve the dephosphorization rate of the process of bessemerizing; Be applied in converter the 0.03-0.08Nm that bottom-blowing of converter gas intensity is made steel by tradition by integrated strong converter Control Based Bottom-blown Stirring
3/ t.min brings up to 0.05-0.4Nm
3/ t.min, further improves the mixing effect of bessemerizing molten bath in early stage, lays the foundation for improving converter dephosphorization rate; By in the process of bessemerizing, select suitable deslagging carry out opportunity in the middle of deslagging, integrated being applied in converter of steel-smelting technology of carrying out again decarburization, intensification; Be applied in method for making steel of the present invention integrated converter steelmaking remaining slag operation technology, utilize the heat of the materials such as the efficient oxidation calcium, ferric oxide and the magnesium oxide that exist in decarburization copper smelter slag and thermal slag, the dissolving agent of smelting heat Primary period as next, meets next and smelts heat Primary period and change in advance the requirement of slag, slagging and minimizing slag making raw material consumption (wherein molten iron phosphorus content be greater than 1.0% heat do not adopt remaining slag operation); When the dephosphorization rate that so combined blown converter blown in earlier stage further increases substantially, again with the effective combination of technology such as steel-smelting technology and remaining slag operation and the thermal cycling of decarburization slag of decarburization, intensification, thereby meet the requirement that the comprehensive dephosphorization rate of converter steelmaking process increases substantially.
Principle of the present invention is mainly to occur in after Primary period desiliconization in molten iron phosphorus oxygen in molten bath according to the dephosphorisation reaction in molten bath to be combined in a large number rear generation Vanadium Pentoxide in FLAKES, afterwards with slag in calcium oxide be combined into calcium phosphate and enter in slag.From thermodynamics, the now temperature in molten bath lower (1400 ℃ of left and right), the basicity moderate (R=2.0) of slag, slag (TFe) content is also in 10% left and right, thermodynamic condition is now applicable to dephosphorization of molten iron very much, at this moment need to maintain this thermodynamic condition, then by good dynamic conditions (the mixed spray in oxygen nitrogen top is stirred and combined with strong bottom blowing), make the dephosphorisation reaction of converter molten pool more abundant.
The present invention adopts Top oxygen blast gas to mix nitrogen, Top and blows and sprays the method that powder and the large flow of bottom blowing stir and combine, and main reason is:
(1) adopt nitrogen and oxygen mix blowing to carry out dephosphorizing pretreatment, can effectively maintain the contribution rate of top-blown gas stream thigh to stirring intensity of molten pool, and suppress the fast lifting of the bath temperature that tradition may bring while utilizing top blowing oxygen air-flow thigh to enliven melting bath stirring, destroy the surroundings of molten bath high efficiency dephosphorating, the ratio of oxygen and nitrogen is adjustable simultaneously, therefore, bath temperature can rationally be controlled with change slag process;
(2) slag making materials with the form of dusting along with high velocity air state enters converter molten pool, powdery slag making materials can fully contact with molten bath molten iron, thereby realize steelmaking process Fast Slag Melting, create good thermodynamics and kinetics condition for the dephosphorisation reaction at steel-making interface, molten bath, made molten iron and the dephosphorisation reaction of dephosphorization phase more abundant;
(3) adopt the bottom blowing stirring intensity of atm number can make melting bath stirring abundant, make the more accessible molecular balance of dephosphorisation reaction between slag.
Make full use of in the present invention the advantage of above method, and they are cooperatively interacted, can obtain better effect.The advantage of invention
Tool of the present invention has the following advantages compared with additive method:
(1) adopting method of the present invention can process molten iron content is 0.2～1.6% middle high phosphorus hot metal, meets normal requirement of producing;
(2) adopt method of the present invention can make the dephosphorization rate of middle and high phosphorus molten iron-steelmaking used for re-blowing revolving furnace exceed 97%;
(3) can make full use of the thermodynamics and kinetics condition of converter molten pool, promote fully carrying out of slag-steel reaction, guarantee under the condition of dephosphorization of molten iron, reduce in molten steel and the oxidisability of slag, improve the recovery rate of molten steel and reduced the consumption of slag making materials.
Embodiment
Illustrate as an example of the 3 stoves tests of 500kg level converter heat simulation furnace example that Top oxygen blast nitrogen mixes by adopting, winding-up lime powder, bottom blowing atm number stir and stay the methods such as slag to carry out the middle high phosphorus hot metal that smelting molten iron phosphorus content is greater than 0.2% with a stove.
Embodiment 1
At 500kg level converter thermal modeling test stove, pack pig iron 200kg into, ferrophosphorus 1.6kg, induction heating is warmed up to 1350 ℃, gets initial iron sample, [C]=4.3%, [Si]=0.5, [P]=0.25%.Blowing starts, and falls oxygen rifle, and Top oxygen blast gas intensity is 1.6Nm
3/ t.min, adds slag making materials lime 8kg, fluorite 1kg, and bottom blowing nitrogen intensity is 0.3Nm
3/ t.min.After blowing 3min, spray into lime powder and iron fine powder mixing powder by spray gun to molten bath, with oxygen, as carrier gas, being always blown into pulvis amount is 5kg, and the flow of carrier gas oxygen is 10Nm
3/ h, after winding-up 3min.Blowing is when 7～8min, to the nitrogen of sneaking into 20% in the rifle of top, to control the temperature in molten bath.Get steel sample and thermometric, [C]=3.5%, [P]=0.025%, T=1360 ℃, dephosphorization rate is 90%.Pull slag after pretreatment dephosphorizing early stage.Carry out afterwards few slag steel-making decarburization, fall oxygen rifle, Top oxygen blast gas intensity is 3.0Nm
3/ t.min, adds lime 2kg, and fluorite 0.5kg sprays into lime powder 2kg to molten bath by spray gun, and bottom blowing nitrogen intensity is 0.2Nm
3/ t.min.After blowing 10min, get steel sample, thermometric, [C]=0.08%, [P]=0.012%, T=1660 ℃, total dephosphorization rate is 95%, has reached the dephosphorization effect of expection.The slag slag making materials as next stove for subsequent use of the few slag carbon period after steel-making uses.
Embodiment 2
At 500kg level converter thermal modeling test stove, pack pig iron 200kg into, ferrophosphorus 3.0kg, induction heating is warmed up to 1400 ℃, gets initial iron sample, [C]=4.8%, [Si]=0.4, [P]=0.52%.Blowing starts, and falls oxygen rifle, and Top oxygen blast gas intensity is 2.0Nm
3/ t.min, adds slag making materials lime 10kg, the terminal slag 5kg of fluorite 2kg and a upper stove, and bottom blowing nitrogen intensity is 0.4Nm
3/ t.min.After blowing 4min, spray into lime powder and iron fine powder mixing powder by spray gun to molten bath, with oxygen, as carrier gas, being always blown into pulvis amount is 7kg, and the flow of carrier gas oxygen is 10Nm
3/ h, after winding-up 4min.Blowing is when 9～10min, to the nitrogen of sneaking into 10% in the rifle of top, to control the temperature in molten bath.Get steel sample and thermometric, [C]=3.4%, [P]=0.046%, T=1380 ℃, dephosphorization rate is 91%.Pull slag after pretreatment dephosphorizing early stage.Carry out afterwards few slag steel-making decarburization, fall oxygen rifle, Top oxygen blast gas intensity is 3.4Nm
3/ t.min, adds lime 2kg, and fluorite 0.5kg sprays into lime powder 4kg to molten bath by spray gun, and bottom blowing nitrogen intensity is 0.25Nm
3/ t.min.After blowing 11min, get steel sample, thermometric, [C]=0.06%, [P]=0.020%, T=1680 ℃, total dephosphorization rate is 96%, has reached the dephosphorization effect of expection.The slag slag making materials as next stove for subsequent use of the few slag carbon period after steel-making uses.
Embodiment 3
At 500kg level converter thermal modeling test stove, pack pig iron 200kg into, ferrophosphorus 6.0kg, induction heating is warmed up to 1400 ℃, gets initial iron sample, [C]=4.9%, [Si]=0.8, [P]=1.02%.Blowing starts, and falls oxygen rifle, and Top oxygen blast gas intensity is 2.5Nm
3/ t.min, adds slag making materials lime 12kg, the terminal slag 6kg of a upper stove, and fluorite 2kg, bottom blowing nitrogen intensity is 0.35Nm
3/ t.min.After blowing 5min, spray into lime powder and iron fine powder mixing powder by spray gun to molten bath, with oxygen, as carrier gas, being always blown into pulvis amount is 10kg, and the flow of carrier gas oxygen is 10Nm
3/ h, after winding-up 5min.Blowing is when 13～15min, to the nitrogen of sneaking into 10% in the rifle of top, to control the temperature in molten bath.Get steel sample and thermometric, [C]=3.7%, [P]=0.08%, T=1360 ℃, dephosphorization rate is 92%.Pull slag after pretreatment dephosphorizing early stage.Carry out afterwards few slag steel-making decarburization, fall oxygen rifle, Top oxygen blast gas intensity is 3.5Nm
3/ t.min, adds lime 4kg, and fluorite 0.8kg sprays into lime powder 5kg to molten bath by spray gun, and bottom blowing nitrogen intensity is 0.3Nm
3/ t.min.After blowing 15min, get steel sample, thermometric, [C]=0.06%, [P]=0.022%, T=1650 ℃, total dephosphorization rate is 98%, has reached the dephosphorization effect of expection.
Claims (6)
1. a method for high phosphorus hot metal in converter processing, is characterized in that: the pre-treatment period and the less-slag melting carbon period that converter smelting are divided into desiliconization of hot metal, dephosphorization; The target of the pre-treatment period of desiliconization of hot metal, dephosphorization is [C]=2.9～3.8%, T=1330～1400 ℃, and dephosphorization rate is 70～95%; The target of less-slag melting carbon period is [C]=0.03～0.5%, T=1550～1720 ℃.
Open while blowing and add in proportion slag making materials, be blown into oxygen by Top oxygen-blowing gun, converter bottom is blown into nitrogen by bottom blowing ventilated element, and employing tolerance is 0.05～0.4Nm
3the bottom blowing stir mode of/t.min, Primary period sprays into lime powder or limestone powder to molten bath by top rifle, take the flow that dusts as 50～400kg/min formation dephosphorized slag; In oxygen rifle, sneak into nitrogen to control bath temperature by Top oxygen-blowing gun, control desiliconization of hot metal, the bath temperature of dephosphorizing pretreatment phase are 1330～1390 ℃;
After desiliconization of hot metal, dephosphorizing pretreatment, outwelling the ratio that slag accounts for total dephosphorization quantity of slag is 65～80%; Enter afterwards few slag decarburization temperature raising period, rejoin slag charge, spray into lime powder or limestone powder to molten bath again, employing oxygen supply intensity is 3.5～5.0Nm
3/ t.min oxygen supply decarburization, taps after determining molten steel composition, temperature according to the requirement of steel grade; After tapping, spatter slag, leaving the quantity of slag is 30～50% slag making materialses as next stove of total slag charge; Guarantee that total dephosphorization rate of high phosphorus hot metal in smelting is more than 90%.
2. according to the method described in right 1, it is characterized in that, weight percentage in described middle high phosphorus hot metal, Si:0.1～2.0%, Mn:0.1～2.0%, P:0.2～1.6%, temperature is: 1250～1400 ℃.
3. according to the method described in right 1, it is characterized in that, described slag making materials comprises lime, Wingdale, agglomerate or pellet; Add-on is to be 2.0 according to desiliconization of hot metal, dephosphorizing pretreatment basicity of slag, and slag MgO content is 8～10%, and slag TFe 5～10% calculates.
4. according to the method described in right 1, it is characterized in that, guaranteeing that Top blows under the condition that air supply intensity do not reduce, in Top oxygen blast gas, sneak into nitrogen, its volume ratio is: oxygen 50～90%, nitrogen 10～50%.
5. according to the method described in right 1, it is characterized in that, described Top oxygen-blowing gun winding-up oxygen and particulate state pulvis, pulvis comprises lime powder, limestone powder, fine iron breeze, and the flow that dusts is 50～400kg/min, and powder granularity is 0.02～0.12mm.
6. according to the method described in right 1, it is characterized in that, be greater than 1.0% heat when molten iron phosphorus content and do not do remaining slag operation.
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| CN104404195A (en) * | 2014-12-24 | 2015-03-11 | 山东钢铁股份有限公司 | Method for smelting high-phosphorus molten iron by duplex-slag remaining process |
| CN104774992A (en) * | 2015-05-04 | 2015-07-15 | 北京佰能电气技术有限公司 | Control device for converter steelmaking nitrogen-oxygen combined blowing |
| CN104928432A (en) * | 2015-06-11 | 2015-09-23 | 江苏永钢集团有限公司 | Method for removing phosphorus in converter through blowing nitrogen |
| CN105779682A (en) * | 2016-03-16 | 2016-07-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for smelting stainless steel in dephosphorization converter by using limestone |
| CN105950816A (en) * | 2016-05-25 | 2016-09-21 | 河北钢铁股份有限公司承德分公司 | Combined blowing dephosphorization method of converter |
| CN106148632A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN107002154A (en) * | 2014-12-16 | 2017-08-01 | 杰富意钢铁株式会社 | The preprocess method of iron liquid |
| CN111647708A (en) * | 2020-06-17 | 2020-09-11 | 武钢集团昆明钢铁股份有限公司 | Long-life synchronous combined blowing dephosphorization smelting method for high-phosphorus molten iron |
| CN113574187A (en) * | 2019-03-15 | 2021-10-29 | 日本制铁株式会社 | Method for producing raw material of phosphate fertilizer |
| CN114635007A (en) * | 2022-03-31 | 2022-06-17 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving dephosphorization rate at earlier stage of converter smelting |
| CN115418434A (en) * | 2022-09-27 | 2022-12-02 | 鞍钢股份有限公司 | Production method of low-phosphorus molten iron for recarburization |
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| CN107002154A (en) * | 2014-12-16 | 2017-08-01 | 杰富意钢铁株式会社 | The preprocess method of iron liquid |
| CN104404195A (en) * | 2014-12-24 | 2015-03-11 | 山东钢铁股份有限公司 | Method for smelting high-phosphorus molten iron by duplex-slag remaining process |
| CN106148632B (en) * | 2015-03-28 | 2018-01-05 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN106148632A (en) * | 2015-03-28 | 2016-11-23 | 鞍钢股份有限公司 | A kind of economical converter less-slag blows smelting process again |
| CN104774992A (en) * | 2015-05-04 | 2015-07-15 | 北京佰能电气技术有限公司 | Control device for converter steelmaking nitrogen-oxygen combined blowing |
| CN104928432A (en) * | 2015-06-11 | 2015-09-23 | 江苏永钢集团有限公司 | Method for removing phosphorus in converter through blowing nitrogen |
| CN105779682A (en) * | 2016-03-16 | 2016-07-20 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Process for smelting stainless steel in dephosphorization converter by using limestone |
| CN105779682B (en) * | 2016-03-16 | 2017-11-03 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of technique of utilization lime stone smelting stainless steel in dephosphorization converter |
| CN105950816A (en) * | 2016-05-25 | 2016-09-21 | 河北钢铁股份有限公司承德分公司 | Combined blowing dephosphorization method of converter |
| CN113574187A (en) * | 2019-03-15 | 2021-10-29 | 日本制铁株式会社 | Method for producing raw material of phosphate fertilizer |
| CN111647708A (en) * | 2020-06-17 | 2020-09-11 | 武钢集团昆明钢铁股份有限公司 | Long-life synchronous combined blowing dephosphorization smelting method for high-phosphorus molten iron |
| CN111647708B (en) * | 2020-06-17 | 2021-09-10 | 武钢集团昆明钢铁股份有限公司 | Long-life synchronous combined blowing dephosphorization smelting method for high-phosphorus molten iron |
| CN114635007A (en) * | 2022-03-31 | 2022-06-17 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving dephosphorization rate at earlier stage of converter smelting |
| CN115418434A (en) * | 2022-09-27 | 2022-12-02 | 鞍钢股份有限公司 | Production method of low-phosphorus molten iron for recarburization |
| CN115418434B (en) * | 2022-09-27 | 2023-09-26 | 鞍钢股份有限公司 | Production method of low-phosphorus molten iron for carburetion |
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