CN103614508A - Method for smelting high-titanium liquid iron by utilizing converter - Google Patents
Method for smelting high-titanium liquid iron by utilizing converter Download PDFInfo
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- CN103614508A CN103614508A CN201310660032.XA CN201310660032A CN103614508A CN 103614508 A CN103614508 A CN 103614508A CN 201310660032 A CN201310660032 A CN 201310660032A CN 103614508 A CN103614508 A CN 103614508A
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- slag
- converter
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- dephosphorization
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Abstract
The invention discloses a method for smelting high-titanium liquid iron by utilizing a converter. The method is mainly used for smelting the high-titanium liquid iron with the titanium mass percentage of 0.3 to 0.5 percent by utilizing the converter. By adopting a double-slag process, the binary basicity of the furnace slag on the preliminary smelting stage of the converter is 0.8 to 1.2, the mass fraction of TFe is 15 to 25 percent, the temperature of a smelting pool is 1370 to 1420 DEG C, and the slagging quantity can reach 50 to 60 percent, so that the problem that the melting point of the furnace slag is increased because the titanium in the liquid iron is oxidized and enters the furnace slag can be maximally reduced; the decarbonization is carried out according to the conventional converter smelting process. By adopting the production process, the melting point of the furnace slag on the preliminary smelting stage can be lowered, the mobility of the furnace slag is good, the overall phosphorus removal rate can reach more than 85 percent, and the splashing can be avoided.
Description
Technical field
The present invention relates to converter steeling technology field, the method that be specifically related to adopt two slag technique, improves total dephosphorization rate by optimizing slag composition and oxygen supply parameter.
Background technology
For alleviating the Mineral resources of growing tension, expand the use of ferric charge, part steel enterprise, with addition of smelting containing V, Ti magnetic iron ore, when cost is low, also brings the higher problem of Ti content in molten iron.Because the binding ability of Ti and O is better than the elements such as Si, Mn, P, the Ti in converter smelting molten iron in early stage is oxidized, enters slag, causes TiO in slag
2content is high, has greatly improved the melting temperature of slag, the very thickness that slag is become, and poor fluidity, is unfavorable for back to back dephosphorization.If adopt conventional double slag process dephosphorization technology to control initial smelting period slag dual alkalinity R>=1.5, half steel temperature is controlled at 1350-1400 ℃, containing TiO
2slag can not melt, and the serious deslagging amount that affects causes converter smelting later stage dephosphorization task to realize simultaneously.
Mainly studied at present high TiO
2the smelting of slag on the impact of blast-furnace smelting or half steel water, does not find the directly introduction of the high titanium dephosphorization of molten iron production technique of smelting in converter.The steel enterprise of climb steel, holding the smelting vanadium titano-magnetites such as steel all adopts " duplex " operation of two converters to smelt high ferrotianium water, that is: be equipped with independent converter extracting vanadium, for guaranteeing later stage vanadium extraction operation, in converter extracting vanadium, do not add lime slag making, basicity of slag is low, and after vanadium extraction finishes, adopt and stay slag tapping, so high TiO during half steel tapping
2the amount that slag enters in molten steel is few, little on the impact of later stage decarburization converter smelting.
Summary of the invention
The object of the present invention is to provide a kind of directly technique of the high titanium dephosphorization of molten iron of smelting of single top-blown oxygen converter of utilizing, this technique is by rationally controlling the conditions such as smelting basicity of slag, oxygen supply duration of blast, deslagging amount, realize high ferrotianium water converter dephosphorization rate and reach more than 85%, reduce that initial smelting period slag is non-foaming, slag steel regardless of phenomenon.
The technical solution adopted in the present invention is: the molten iron that is 0.30 ~ 0.50% for titanium quality percentage composition, in single top-blown oxygen converter, adopt two slag technique to smelt, converter smelting process route is: add the de-Ti-deslagging of steel scrap, molten iron-bessemerize-bessemerize dephosphorization decarburization-converter tapping, wherein the de-Ti stage is to the mixture slag making that adds lime, light dolomite and ore in converter, controlling slag dual alkalinity R is 0.8 ~ 1.2, and in slag, TFe quality percentage composition is 15 ~ 25%; Control the de-Ti stage quantity of slag, make TiO in molten iron
2quality percentage composition is 8%-15%.
Converter is for dephosphorization, must adopt high alkalinity slag, yet while bessemerizing high Ti molten iron, can cause producing in slag TiO
2, in high alkalinity dephosphorization slag, TiO
2can significantly improve the fusing point of slag system, destroy the mobility of slag.In order to improve high alkalinity containing TiO
2the mobility of slag, can only improve bath temperature, and this is not inconsistent with the required low temperature of dephosphorisation reaction thermodynamics.So, if utilize high Ti molten iron to carry out converter smelting, in order to guarantee the effect of dephosphorization, just must, in the early stage of bessemerizing, remove fast slag fluidity is affected to huge TiO
2.
In converter smelting early stage, Ti, Si, Mn element react with oxygen successively, enter in slag, because the oxidation of Si causes SiO in slag
2increase sharply, coordinate and add a small amount of lime, light dolomite, can obtain the slag of lower basicity, dual alkalinity R=0.8 ~ 1.2, now the Ti overwhelming majority in molten iron enters in slag, TiO in slag during low basicity
2content is less on slag melting impact, has ready conditions and obtains the slag of good fluidity, can adopt at this moment two slag technique, outwells high TiO in early stage
2content slag, the more conventional converter dephosphorization slag that is again equipped with high alkalinity carries out follow-up dephosphorization, Decarburization Operation, just can reduce the TiO in converter middle and later periods high alkalinity slag
2content, thereby the dephosphorization effect of assurance converter.
Therefore, in smelting process of the present invention, control with parameter in accordance with the following steps:
(1) add after steel scrap, molten iron, according to the Thermodynamic Law of each element in molten iron, Ti, Si are first oxidized, de-Ti, Si stage add lime, light dolomite, ore slag making in converter, controlling slag dual alkalinity R is 0.8 ~ 1.2, in slag, TFe massfraction is 15 ~ 25%, controls the quantity of slag simultaneously, makes TiO
2quality percentage composition reaches 8%-15%;
According to CaO-SiO
2-TiO
2three component system phasor exists fusing point lower than the region of 1400 ℃ in basicity of slag R is 0.8 ~ 1.2 scope.In actual production process, through repeated multiple times practice, find, if improve slag TFe massfraction to 15-25%, as basicity of slag R≤1.5, TiO
2during massfraction≤15%, TiO
2content increases fusing point impact little, in addition along with TiO
2the increase of content, slag surface tension reduces, and the foamed that is conducive to slag is separated with slag steel.So, before entering dephosphorizing process in converter, the TiO trying one's best in many removal slags
2, can according to above-mentioned steps, control the quantity of slag and slag composition intentionally, thereby by high TiO
2slag is poured out.
(2) de-Ti duration of blast is controlled as 3-4min, and it is 1370 ~ 1420 ℃ that finishing blowing temperature is controlled;
Blowing after 3-4 minute, now substantially completed whole oxidations of Ti and the oxidation of most of Si element, is to control basicity of slag and remove TiO
2necessary time.The control of temperature is mainly in order to ensure the mobility of slag and avoids converter reaction to enter the decarburization stage.
(3) fall to take off Ti slag, deslagging amount reaches 50% ~ 60% of total quantity of slag, carries out afterwards dephosphorization Decarburization Operation;
Only have to pour out fully and be rich in TiO
2slag, TiO in the follow-up dephosphorization slag of guarantee
2content is low, thereby is conducive to dephosphorization operation.In actual mechanical process of the present invention, the main task in early stage is de-Ti, so the quantity of slag is also little, pour out after 1/2, then manufacture dephosphorization slag, this link dephosphorization slag quantity of slag is larger, consistent with the quantity of slag in conventional converter dephosphorization operation, be equivalent to de-Ti slag and fully diluted in the dephosphorization stage, TiO in slag
2massfraction below 4%, now slag temperature is high, the TiO in slag
2the mobility of slag and dephosphorization effect are had no to disadvantageous effect.
In addition, dephosphorization carbon rejection process adds lime, light dolomite, ore slag making in converter, in order to obtain good low temperature dephosphorization condition, improves containing TiO
2slag fluidity, basicity should not be controlled too high, and slag dual alkalinity is controlled by 3 ~ 4.
In whole converter steelmaking process, controlling top blast oxygen supply intensity is 2.8-3.5Nm
3/ min/t steel.
When employing is carried out converter smelting operation containing Ti molten iron cheaply, run into TiO
2cause the poor problem of slag fluidity, in order to remove TiO
2, guaranteeing dephosphorization effect, the present invention has adopted the pattern of " two slag " operation, and blow Ti, the Si that first carry out the short period of time operate, and produce low melting point, low basicity, high TiO in 3-4 minute
2, high TFe content slag, coordinate suitable temperature, this part slag is outwelled as far as possible, then and then slag making again again, carries out conventional dephosphorization, decarburization and smelts.
Adopt the present invention, can stablize and smelt the molten iron that Ti quality percentage composition is 0.3 ~ 0.5%, guarantee that dephosphorization rate is more than 85% simultaneously, operating process does not have splash problem.
Embodiment
Following table 1 to table 5 has been listed the dephosphorization technology key parameter example that adopts the present invention to smelt high ferrotianium water on 100 tons of oxygen coverters, but protection scope of the present invention is not limited in following examples.
Table 1 converter enters stove hot metal composition, massfraction %:
| Heat | C | Si | Ti | P |
| 1 | 3.87 | 0.57 | 0.37 | 0.098 |
| 2 | 4.13 | 0.48 | 0.43 | 0.095 |
| 3 | 4.03 | 0.44 | 0.47 | 0.089 |
Table 2 is bessemerized slag slag charge in earlier stage and is added situation, kg/ ton steel:
| Heat | Lime | Light dolomite | Ore |
| 1 | 13.1 | 0.77 | 15.7 |
| 2 | 11.9 | 0.78 | 15.4 |
| 3 | 12.7 | 1.21 | 16.1 |
Table 3 is bessemerized process parameter control in early stage:
| Heat | Duration of blast, min | Finishing blowing temperature, ℃ | Deslagging amount, % |
| 1 | 3.7 | 1389 | 54.0 |
| 2 | 3.9 | 1404 | 52.3 |
| 3 | 4.0 | 1410 | 59.1 |
Table 4 is bessemerized dephosphorization decarburization slag in early stage and is formed, mass percent %:
| Heat | CaO | SiO2 | TiO2 | TFe | Other | Basicity of slag R |
| 1 | 25.23 | 25.47 | 9.57 | 17.78 | 21.95 | 0.99 |
| 2 | 24.21 | 22.59 | 11.08 | 20.33 | 21.79 | 1.07 |
| 3 | 24.54 | 22.07 | 14.74 | 22.79 | 15.87 | 1.11 |
Table 5 converter terminal parameter level of control:
| Heat | C content, % | P content, % | Dephosphorization rate, % | Temperature, ℃ | TiO in slag 2Content, % | Basicity of slag R |
| 1 | 0.11 | 0.012 | 87.75 | 1580 | 4.39 | 3.3 |
| 2 | 0.09 | 0.011 | 88.42 | 1608 | 3.90 | 3.7 |
| 3 | 0.09 | 0.009 | 89.89 | 1603 | 4.57 | 3.8 |
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (5)
1. the method for the high ferrotianium water of converter smelting, it is characterized in that: the molten iron that titanium quality percentage composition is 0.30 ~ 0.50%, in top-blown oxygen converter, adopt two slag technique to smelt, converter smelting process route is: add the de-Ti-deslagging of steel scrap, molten iron-bessemerize-bessemerize dephosphorization decarburization-converter tapping, wherein the de-Ti stage is to the mixture slag making that adds lime, light dolomite and ore in converter, controlling slag dual alkalinity R is 0.8 ~ 1.2, and in slag, TFe quality percentage composition is 15 ~ 25%; Control the de-Ti stage quantity of slag, make TiO in molten iron
2quality percentage composition is 8%-15%.
2. method according to claim 1, is characterized in that: described de-Ti duration of blast is controlled as 3-4min, and controlling de-Ti finishing blowing temperature is 1370 ~ 1420 ℃.
3. method according to claim 1 and 2, is characterized in that: described falls to take off Ti slag, and deslagging amount reaches the 50%-60% of total quantity of slag, carries out afterwards dephosphorization Decarburization Operation.
4. method according to claim 1 and 2, is characterized in that: the described dephosphorization carbon rejection process of bessemerizing is to the mixture slag making that adds lime, light dolomite and ore in converter, and controlling slag dual alkalinity R is 3 ~ 4.
5. method according to claim 3, is characterized in that: the described dephosphorization carbon rejection process of bessemerizing is to the mixture slag making that adds lime, light dolomite and ore in converter, and controlling slag dual alkalinity R is 3 ~ 4.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164528A (en) * | 2014-07-26 | 2014-11-26 | 钢铁研究总院 | Hot metal titanium-removal method in combined blown converter |
| CN106574311A (en) * | 2014-08-21 | 2017-04-19 | 株式会社神户制钢所 | Method for controlling ti concentration in steel, and method for producing silicon-deoxidized steel |
| CN107090535A (en) * | 2017-05-24 | 2017-08-25 | 首钢总公司 | A kind of converter smelting high phosphorus titaniferous molten iron protects the control method of carbon tapping |
| CN111206137A (en) * | 2020-03-02 | 2020-05-29 | 马鞍山钢铁股份有限公司 | Method for stably controlling low titanium content in high-grade non-oriented silicon steel produced by high-titanium molten iron |
| CN111635973A (en) * | 2020-06-04 | 2020-09-08 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN112575136A (en) * | 2020-12-08 | 2021-03-30 | 首钢集团有限公司 | Method for dephosphorizing titanium-containing molten iron in converter |
| CN112981032A (en) * | 2021-02-05 | 2021-06-18 | 邯郸钢铁集团有限责任公司 | Method for smelting low-titanium high-carbon chromium bearing steel by high-titanium molten iron |
| CN113462844A (en) * | 2021-05-25 | 2021-10-01 | 首钢水城钢铁（集团）有限责任公司 | Less-slag smelting method of titanium-containing molten iron converter |
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| WO2018021019A1 (en) * | 2016-07-27 | 2018-02-01 | 新日鐵住金株式会社 | Molten steel production method |
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| CN103320566A (en) * | 2013-06-26 | 2013-09-25 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for smelting semi-steel through double-slag process |
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| CN102676726A (en) * | 2012-05-08 | 2012-09-19 | 首钢总公司 | Smelting process capable of utilizing converter slag fully |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104164528A (en) * | 2014-07-26 | 2014-11-26 | 钢铁研究总院 | Hot metal titanium-removal method in combined blown converter |
| CN106574311A (en) * | 2014-08-21 | 2017-04-19 | 株式会社神户制钢所 | Method for controlling ti concentration in steel, and method for producing silicon-deoxidized steel |
| CN107090535A (en) * | 2017-05-24 | 2017-08-25 | 首钢总公司 | A kind of converter smelting high phosphorus titaniferous molten iron protects the control method of carbon tapping |
| CN107090535B (en) * | 2017-05-24 | 2018-10-23 | 首钢集团有限公司 | A kind of converter smelting high phosphorus titaniferous molten iron protects the control method of carbon tapping |
| CN111206137A (en) * | 2020-03-02 | 2020-05-29 | 马鞍山钢铁股份有限公司 | Method for stably controlling low titanium content in high-grade non-oriented silicon steel produced by high-titanium molten iron |
| CN111206137B (en) * | 2020-03-02 | 2021-12-21 | 马鞍山钢铁股份有限公司 | Method for stably controlling low titanium content in high-grade non-oriented silicon steel produced by high-titanium molten iron |
| CN111635973A (en) * | 2020-06-04 | 2020-09-08 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN111635973B (en) * | 2020-06-04 | 2022-01-04 | 北京首钢股份有限公司 | Method for removing titanium from molten iron of converter |
| CN112575136A (en) * | 2020-12-08 | 2021-03-30 | 首钢集团有限公司 | Method for dephosphorizing titanium-containing molten iron in converter |
| CN112981032A (en) * | 2021-02-05 | 2021-06-18 | 邯郸钢铁集团有限责任公司 | Method for smelting low-titanium high-carbon chromium bearing steel by high-titanium molten iron |
| CN112981032B (en) * | 2021-02-05 | 2022-09-06 | 邯郸钢铁集团有限责任公司 | Method for smelting low-titanium high-carbon chromium bearing steel by high-titanium molten iron |
| CN113462844A (en) * | 2021-05-25 | 2021-10-01 | 首钢水城钢铁（集团）有限责任公司 | Less-slag smelting method of titanium-containing molten iron converter |
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Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee before: Capital Iron & Steel General Company |
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