CN1275625A - Semi-steel dephosphorizing desulfurizing steel-making technology - Google Patents
Semi-steel dephosphorizing desulfurizing steel-making technology Download PDFInfo
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Abstract
A semisteel dephosphorization and desulfurization steel-smelting process is characterized by ading a semisteel dephosphorization and desulfurization process to the vanadium-contained iron ore steel-smelting process, i. e. adding dephosphorizing and desulfurizing agent to semisteel produced after the vanadium is extracted from said iron ore, and the said dephosphorizing and desulfurizing agent is a three-component system using calcium oxide, iron oxide nd calcium fluoride as basis and contains soda and manganese ore as additives. Before converting, firstly the predephosphorization and predesulfurization process is implemented, then the molten slag produced after dephosphorization and the obtained semisteel are placed in a converter to make molten slag produce steel-smelting reaction so as to raise dephopshorization rate and produce ultra-low-phosphorus steel and pure steel.
Description
Semi-steel dephosphorizing desulfurizing steel-making technology, a kind of ferrous metallurgy novel process.
Known vanadium titano-magnetite or the technical process that contains vanadium iron ore deposit steel-making shown in Figure of description 1 promptly: blast furnace ironmaking obtains vanadium-bearing hot metal, through the even composition of hot metal mixer and temperature and storage, vanadium-bearing hot metal is blended into Converter Oxigen Blowing makes the vanadium oxidation enter slag, molten iron carbon content after the vanadium extraction is lower than common molten iron, the also extremely low this molten iron of silicon content claims half steel, and half steel enters converter steelmaking and obtains Finished Steel.
There are the following problems in above-mentioned known processes system:
(1) because Bessemer ore is fewer and feweri both at home and abroad, and blast furnace ironmaking can not remove phosphorus, and harmful element phosphorus all enters molten iron in the raw material, and the vanadium extraction process does not have dephosphorizing capacity yet, phosphorus all enters half steel.To making steelmaking process will bear whole dephosphorization tasks, converter steelmaking dephosphorization burden is heavy;
(2) along with production, development of science and technology, market proposes more and more higher requirement to steel product quality, harmful element phosphorus, sulphur content in the steel are required more and more lower, for example by in the past standard, many steel grades phosphorous 0.03～0.45% all are qualified, and require now to be lower than 0.025%.Refine and phosphorously be lower than 0.003% Clean Steel and become developing direction with phosphorous smaller or equal to 0.01% ultra-low phosphoretic steel, be domestic iron and steel enterprises important topic anxious to be solved, phosphorous the increasing of molten iron (or half steel), the phosphorous requirement again of steel is more and more lower, more increased the weight of steel-making dephosphorization task
3, owing to must adopt lower temperature operation with containing sefstromite ironmaking, blast-melted temperature has only 1180～1300 ℃ than low as domestic certain big factory, and average about 1250 ℃, the molten iron that the more common iron ore of molten iron physics heat is produced is low.Molten iron is siliceous to have only 0.05～0.2%, average 0.1%, more much lower than common molten iron siliceous 0.4～0.8%.After vanadium extraction, the half steel carbon containing is by average about 4.4%, drops to average approximately 3.6～3.7%, and siliceous has been vestige, and converter steelmaking is that carbon, silicon are main oxidation heating elements by the self-heating procedure of some elements in the half steel such as carbon, silicon, manganese, iron, oxidation heating.Carbon, the few molten iron chemistry of silicone content less calories.So semi-steel making is particularly more outstanding during refining high carbon steel than just seem nervous with common molten iron-steelmaking heat.
Generate silicon-dioxide (SiO behind the silicon oxidation
2), the slag making materials lime (main component is a calcium oxide) that adds during with steel-making is combined into the multi-component slag of the lower compound formation of fusing point, it is slagging process, because half steel is siliceous low, the steel-making blowing initial stage (it has been generally acknowledged that promptly bath temperature is lower than 1500 ℃, in carbon not a large amount of fast oxidative periods in the molten metal, bath temperature is lower), change the slag difficulty.And dephosphorisation reaction mainly forms reactive good slag fast by the initial stage, so semi-steel making initial stage slag is slow, initial stage dephosphorization efficient is low, total steel-making dephosphorization rate low (removing the per-cent of phosphorus concentration and initial phosphorus concentration), adopt the total dephosphorization rate of common molten iron-steelmaking can reach 90%, and have only 70～80% with semi-steel making, then lower during refining high carbon steel.
Adopt during steel-making to add solid slag making material in converter in batches, all do not find solution initial stage slag slow so far both at home and abroad, the low good method of steel-making dephosphorization rate has become technical barrier.
Steel is climbed by China and Steel Plant of Russian Nizhni Tagil are domestic and international maximums, the most representative vanadium extraction by converter blowing, converter semi-steel making enterprise.Climbing the steel half steel average phosphorous is 0.065%, also on the rise.Factory of Nizhni Tagil is average phosphorous 0.035～0.040%, and steel-making initial stage slag is slow, and all there are very big difficulty in smelting ultra-low phosphoretic steel and Clean Steel with known flow process and process for making.
Therefore, slough phosphorus, sulphur as far as possible before half steel enters converter steelmaking, become to produce ultra-low phosphoretic steel, the technology of ultralow-sulfur steel or Clean Steel is closed chain.
The objective of the invention is increases semi-steel dephosphorizing, sulphur technology in above-mentioned known flow process, the function of flow process such as Figure of description 2, this process is phosphorus, the sulphur that removes as required in the half steel, alleviates converter steelmaking dephosphorization, sulphur burden; Promotion initial stage dephosphorization sulphur and the total dephosphorization rate of raising semi-steel making are guaranteed phosphorous general requirement steel grade 100% qualification rate, create the technical qualification of producing ultra-low phosphoretic steel and Clean Steel economically.
The present invention is achieved by the following technical solutions.
1, technical process promptly adds a semi-steel dephosphorizing, sulphur process before converter steelmaking shown in Figure of description 2, and is blast-melted through the desulfurization processing, gets half steel again after vanadium extraction, and half steel is through dephosphorization, and sulphuring treatment enters converter steelmaking, the low phosphoretic steel of last output.
2, the composition of dephosphorization/desulfurizing agent, prescription: (soda or manganese ore are formed based on the outer doping of the three component system of calcium oxide-ferric oxide-Calcium Fluoride (Fluorspan); Its prescription is: calcium oxide (CaO) 〉=38%, Calcium Fluoride (Fluorspan) (CaF
2) 〉=15%, ferric oxide (FeO) 〉=20%, magnesium oxide (MgO)≤6%, sulphur (S)＜0.15%, phosphorus (P)＜0.1%, additive 2～6%
3, processing condition:
1350～1410 ℃ of semi-steel dephosphorizing, sulphur process temperatures
The add-on of dephosphorization/desulfurizing agent is 0.3～3.0% of a half steel total amount
The main raw material of dephosphorization/desulfurizing agent can be used lime, fluorite, iron scale, converter stove dirt.Its manufacture method can and be given molten method with mechanical mixing, mechanically mixing pressure ball method, the simple addition method in the adding method of dephosphorization/desulfurizing agent can be in going out the half steel process pours jar with half steel or it is blown into blowing process in the half steel.
4, the slag behind semi-steel dephosphorizing, the sulphur is blended into steel-making converter, makes slag participate in the steelmaking process reaction together with half steel.
5, the technico-economical comparison that is obtained
1) half steel is original phosphorous 0.035～0.10%, and half steel is phosphorous less than 0.04% behind the dephosphorization, and dephosphorization rate is 10～60%;
2) the original sulfur-bearing 0.05%～0.15% of molten iron, giving desulfurization by molten iron can drop to sulphur below 0.01%, through semi-steel dephosphorizing, sulphuring treatment, can reduce by 10～40% again.
3) slag that dephosphorization, sulphur are generated is blended into steel-making converter and participates in the steel-making reaction process, make the slag charge of required adding in steel-making converter that the solid material not only be arranged, also have the molten slag that adds at the very start, promoted the initial stage slag, to improving converter steelmaking, further removing phosphorus, sulphur, improving total dephosphorization rate, produce low phosphoretic steel and Clean Steel is laid the good technical basis.
4) the present invention also is applicable to hot metal containing low silicon (siliceous＜0.2%) and the process for making system that gives desiliconization through molten iron
Fig. 1 is the process flow sheet of known technology, and Fig. 2 is a process flow sheet of the present invention
6, the advantage and the good effect that compared with prior art have of present technique
(1) perfect 26S Proteasome Structure and Function from blast-melted to the steelmaking process system is on structure Before steel-making, increased and given the dephosphorization link, increased and given the dephosphorization function, solved known flow process refining The problem that does not have dephosphorizing capacity before the steel, it is negative to alleviate the pneumatic steelmaking dephosphorization by difference requirement degree Load;
(2) make dephosphorization be operated in steel-making and just finished part or all before, can give full play to The quick decarburization of steelmaking converter, the metallurgical advantage of temperature raising is made good condition for steel-making, reduces Steel-making cost;
(3) quantitative change of the slag behind adding semi-steel dephosphorizing, the sulphur, it is different phosphorous to can be used as smelting Require the flexibly technology regulating measure of steel grade;
(4) simply pour method and give the dephosphorization technology method, small investment, instant effect takes up an area and lacks, no Take the too much operating time;
(5) give dephosphorizing process and can also take off part sulphur, also alleviated the steel desulfurization burden;
(6) the dephosphorization slag is blended into converter and participates in steelmaking process, accelerated the steel-making initial reaction The speed that good initial stage slag forms has improved semi-steel making dephosphorization, sulphur rate; Reduced steel-making Cost;
(7) be refining ultra-low phosphoretic steel and clean steel, developing new product variety has been established technical foundation.
Embodiment
The steel half steel is climbed in smelting, makes steel 50,000 tons altogether, 120 tons of converter capacities, and 140 tons of half steel tankages, steel-making converter are blended into 137 tons of half steels, the initial phosphorous P of half steel
o=0.061%.
1, technical process: converter extracting vanadium goes out half steel, go out in the half steel process to the half steel jar to add dephosphorization/desulfurizing agent, consumption is 2.2%, does not remove the gred behind the dephosphorization sulphur, the half steel jar is hung steel-making converter, the half steel of band dephosphorization, sulphur slag is blended into steel-making converter together, and last Oxygen Furnace Steel is to tapping.
2, the compositing formula of dephosphorization/desulfurizing agent: with calcium oxide, ferric oxide, Calcium Fluoride (Fluorspan) is the outer additive that is with soda of three component system on basis; Its prescription is calcium oxide 45%, Calcium Fluoride (Fluorspan) 30%, ferric oxide 30%, magnesium oxide 2%, sulphur below 0.1%, phosphorus 0.08%, additive 2%.
3, processing condition: 1330～1400 ° of temperature, the consumption 2.2% of dephosphorization/desulfurizing agent (22kg/t half steel).
4, the technico-economical comparison of obtaining: steel-making terminal point (Oxygen Furnace Steel is to tapping) phosphorus content P
Eventually=0.0051%, total dephosphorization rate 91.64%, the slag time at initial stage shortens 1 ' 40 " and clock, the steel-making duration of blast shortens 4 ' clock, and total slag charge consumption 75.56kg/t steel reduces the 34.44kg/t steel than known technology
Claims (5)
1, a kind of semi-steel dephosphorizing desulfurizing steel-making technology, its technical process is: the blast-melted half steel that gets after desulfurization is handled, half steel enter bessemerize Finished Steel, it is characterized in that: before above-mentioned technical process converter steelmaking, increase a semi-steel dephosphorizing, sulphur process, blast-meltedly handle through desulfurization, after vanadium extraction, obtain half steel, half steel again through dephosphorization, sulphuring treatment, enter converter steelmaking, at last low-phosphorous Finished Steel.
1) composition of dephosphorization/desulfurizing agent and prescription: dephosphorization/desulfurizing agent is that the element and the additive (soda or manganese ore) of---ferric oxide---Calcium Fluoride (Fluorspan) based on calcium oxide formed; Its prescription is: calcium oxide (CaO) 〉=38%, Calcium Fluoride (Fluorspan) (CaF
2) 〉=15%, ferric oxide (FeO) 〉=20%, magnesium oxide (MgO)≤6%, sulphur (S)＜0.15%, phosphorus (P)＜0.1, additive (soda or manganese ore) 2～6%;
2) processing condition:
1330～1410 ℃ of semi-steel dephosphorizing, sulphur temperature;
The add-on of dephosphorization carbon agent is 0.3～3.0% of a half steel total amount;
3) slag behind semi-steel dephosphorizing, the sulphur is blended into steel-making converter, makes slag together with half steel
The reaction of participation steelmaking process.
2, semi-steel dephosphorizing desulfurizing steel-making technology according to claim 1 is characterized in that: the main raw material of dephosphorization sulphur agent is lime, fluorite, iron scale, converter stove dirt.
3, semi-steel dephosphorizing sulphur steel-making technology according to claim 1 is characterized in that: the manufacture method of dephosphorization sulphur agent has mechanical mixing, mechanically mixing pressure ball method and gives molten method.
4, want 1 described semi-steel dephosphorizing desulfurizing steel-making technology according to right, it is characterized in that: the adding method of dephosphorization sulphur agent is to pour simple addition method in the steel-making jar with half steel stream in going out the half steel process, or the agent of phosphorus sulphur is blown into blowing process in the half steel.
5, according to claim 1,2,3,4 described semi-steel dephosphorizing desulfurizing steel-making technologies, it is characterized in that: it also is applicable to hot metal containing low silicon and the process for making system through giving desiliconization.
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| CN 00113001 CN1275625A (en) | 2000-06-07 | 2000-06-07 | Semi-steel dephosphorizing desulfurizing steel-making technology |
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100467620C (en) * | 2007-07-16 | 2009-03-11 | 武汉钢铁(集团)公司 | Melting method for dephosphorization under reducing atmosphere for high phosphate ore |
| CN101302578B (en) * | 2008-06-27 | 2010-06-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite vanadium extraction and dephosphorization agent for vanadium-containing molten iron and preparation thereof |
| CN101643811B (en) * | 2009-08-28 | 2011-01-05 | 昆明钢铁控股有限公司 | Method for producing low-phosphorous molten iron by high-phosphorous reduced iron |
| CN101993980A (en) * | 2010-11-26 | 2011-03-30 | 首钢总公司 | Method for smelting ultralow-phosphorous steel |
| CN102230051A (en) * | 2011-06-16 | 2011-11-02 | 攀钢集团有限公司 | Method for controlling nitrogen content in steel by semi-steel smelting |
| CN101962698B (en) * | 2009-07-24 | 2012-02-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel converter steelmaking method |
| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| CN103060512A (en) * | 2013-02-07 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| CN103194567A (en) * | 2013-04-26 | 2013-07-10 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting process of iron ore containing vanadium |
| CN103215405A (en) * | 2013-03-18 | 2013-07-24 | 酒泉钢铁(集团)有限责任公司 | Method for dephosphorization treatment on molten iron by using stainless steel self-produced dedusting ash ball |
| CN103525979A (en) * | 2013-10-23 | 2014-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel dephosphorizing agent, semisteel dephosphorizing method and steel smelting method thereof |
| CN103540711A (en) * | 2013-10-23 | 2014-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously removing sulfur and phosphorus from semi-steel |
| CN103540703A (en) * | 2012-07-11 | 2014-01-29 | 攀钢集团研究院有限公司 | Method for simultaneously dephosphorizing and extracting vanadium through converter |
| CN104046717A (en) * | 2013-12-03 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium and titanium-containing molten iron converter steelmaking method |
| CN104060050A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060049A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Desulfurization and dephosphorization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060048A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060017A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi steel converter steelmaking method |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
| CN106282475A (en) * | 2016-09-18 | 2017-01-04 | 河钢股份有限公司承德分公司 | A kind of method efficiently utilizing converter dust-removing ash |
| CN108165705A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of method of producing ultra-low phosphoretic steel by molten steel dephosphorising outside furnace |
| CN108165704A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of vanadium extraction half steel extra furnace dephosphorization Dephosphorising flux and its preparation method and application |
-
2000
- 2000-06-07 CN CN 00113001 patent/CN1275625A/en active Pending
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| CN100467620C (en) * | 2007-07-16 | 2009-03-11 | 武汉钢铁(集团)公司 | Melting method for dephosphorization under reducing atmosphere for high phosphate ore |
| CN101302578B (en) * | 2008-06-27 | 2010-06-16 | 攀钢集团攀枝花钢铁研究院有限公司 | Composite vanadium extraction and dephosphorization agent for vanadium-containing molten iron and preparation thereof |
| CN101962698B (en) * | 2009-07-24 | 2012-02-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel converter steelmaking method |
| CN101643811B (en) * | 2009-08-28 | 2011-01-05 | 昆明钢铁控股有限公司 | Method for producing low-phosphorous molten iron by high-phosphorous reduced iron |
| CN101993980B (en) * | 2010-11-26 | 2013-01-09 | 首钢总公司 | Method for smelting ultralow-phosphorous steel |
| CN101993980A (en) * | 2010-11-26 | 2011-03-30 | 首钢总公司 | Method for smelting ultralow-phosphorous steel |
| CN102230051A (en) * | 2011-06-16 | 2011-11-02 | 攀钢集团有限公司 | Method for controlling nitrogen content in steel by semi-steel smelting |
| CN102230051B (en) * | 2011-06-16 | 2012-12-12 | 攀钢集团有限公司 | Method for controlling nitrogen content in steel by semi-steel smelting |
| CN103540703A (en) * | 2012-07-11 | 2014-01-29 | 攀钢集团研究院有限公司 | Method for simultaneously dephosphorizing and extracting vanadium through converter |
| CN103540703B (en) * | 2012-07-11 | 2016-01-20 | 攀钢集团研究院有限公司 | The method of a kind of converter Dephosphorization vanadium extraction |
| CN102766722A (en) * | 2012-07-17 | 2012-11-07 | 攀钢集团研究院有限公司 | Method for smelting high-carbon steel from semi-steel |
| CN103060512B (en) * | 2013-02-07 | 2014-04-02 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| CN103060512A (en) * | 2013-02-07 | 2013-04-24 | 武钢集团昆明钢铁股份有限公司 | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter |
| CN103215405A (en) * | 2013-03-18 | 2013-07-24 | 酒泉钢铁(集团)有限责任公司 | Method for dephosphorization treatment on molten iron by using stainless steel self-produced dedusting ash ball |
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| CN104060048A (en) * | 2013-09-16 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Dephosphorization and desulfurization agent and semisteel simultaneous desulphurization and dephosphorization method |
| CN104060048B (en) * | 2013-09-16 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of desulfurization dephosphorization agent and half steel be the method for desulfurization dephosphorization simultaneously |
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| CN104060050B (en) * | 2013-09-16 | 2016-07-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of desulfurization dephosphorization agent and half steel desulfurization dephosphorization simultaneously |
| CN104060049B (en) * | 2013-09-16 | 2016-05-25 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of desulfurization dephosphorization agent and half steel be the method for desulfurization dephosphorization simultaneously |
| CN103540711A (en) * | 2013-10-23 | 2014-01-29 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for simultaneously removing sulfur and phosphorus from semi-steel |
| CN103525979A (en) * | 2013-10-23 | 2014-01-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel dephosphorizing agent, semisteel dephosphorizing method and steel smelting method thereof |
| CN103525979B (en) * | 2013-10-23 | 2015-02-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Semisteel dephosphorizing agent, semisteel dephosphorizing method and steel smelting method thereof |
| CN104046717A (en) * | 2013-12-03 | 2014-09-17 | 攀钢集团攀枝花钢铁研究院有限公司 | Vanadium and titanium-containing molten iron converter steelmaking method |
| CN104060017B (en) * | 2013-12-06 | 2016-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method of semisteel converter steelmaking |
| CN104060017A (en) * | 2013-12-06 | 2014-09-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Semi steel converter steelmaking method |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
| CN106282475A (en) * | 2016-09-18 | 2017-01-04 | 河钢股份有限公司承德分公司 | A kind of method efficiently utilizing converter dust-removing ash |
| CN108165705A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of method of producing ultra-low phosphoretic steel by molten steel dephosphorising outside furnace |
| CN108165704A (en) * | 2017-12-19 | 2018-06-15 | 北京科技大学 | A kind of vanadium extraction half steel extra furnace dephosphorization Dephosphorising flux and its preparation method and application |
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