CN104263875A - Dephosphorizing method for producing alloy weld line steel from high-phosphorus molten iron by top-blown converter - Google Patents
Dephosphorizing method for producing alloy weld line steel from high-phosphorus molten iron by top-blown converter Download PDFInfo
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Abstract
The invention relates to a dephosphorizing method for producing alloy weld line steel from high-phosphorus molten iron by a top-blown converter, belonging to the technical field of top-blown converter dephosphorization. The phosphorus accounts for 0.14-0.15 wt% of the molten iron, and a double slag technique is used for smelting in the oxygen top-blown converter. The converter smelting technique comprises the following steps: adding steel scrap and molten iron, carrying out converter blowing for dephosphorization, deslagging, carrying out converter blowing for dephosphorization and decarbonization, and carrying out converter tapping. In the earlier converter smelting stage, the diacidic basicity of the furnace slag is 2.2, the mass percent of TFe is 18%, the melting bath temperature is 1340-1360 DEG C, and the deslagging amount is up to 50-60%, so that the maximal phosphorus in the molten iron is oxidized and enters the furnace slag; and the high-phosphorus slag is poured out. The decarbonization stage is operated according to the conventional converter smelting process, the converter end diacidic basicity R is 3.2-3.5, the mass percent of TFe is 18-19%, and the final temperature is 1640-1660 DEG C. The production technique is convenient for slag steel reaction of which the earlier smelting stage is in the low-temperature stage, and ensures the total dephosphorization ratio to achieve 93.3%.
Description
Technical field
The invention belongs to top blown converter dephosphorizing technology field, particularly relating to a kind of top blown converter adopts high phosphorus hot metal to produce the dephosphorizing method of alloy bonding wire (ER50-6) steel, a kind of top blown converter improves the method that dephosphorization rate produces bonding wire steel, because top blown converter dynamic conditions is more far short of what is expected than combined blown converter, by adding a large amount of agglomerate to control temperature in early stage, increase the churning time of molten iron at cold stage, thus improve dephosphorization efficiency, meet the needs of production.
Background technology
In recent years, steel products are increasingly strict to the requirement of phosphorus content.In order to meet the requirement of iron and steel quality, need the phosphorus as much as possible efficiently removed in the converter stage in molten iron.Top blown converter, due to the bad shortcoming of kinetics, easily causes slag peroxidation, dephosphorization difficulty.The oxygen rifle spraying oxygen is the important composition part of top blast system, and suitable oxygen lance position and oxygen flow better can control the physical-chemical reaction characteristic between slag steel, extremely important for ensureing to bessemerize steel-making normally.
Traditional top blown converter converting process is: the useless non-dephosphorization molten iron of steel ﹑ and dephosphorizing agent are loaded into converter, Si ﹑ P and C etc. then in top blast dioxygen oxidation removing molten iron.But because blowing liquid steel temperature in latter stage is high, the phosphorus sloughed in molten iron can partly return in molten steel, therefore need to use excessive lime to fix dephosphorization product, result in the low and waste sludge discharge amount of slag dephosphorization efficiency increases.
Using efficient dephosphorization agent and optimizing dephosphorization technology is the effective ways improving dephosphorization efficiency and reduce waste sludge discharge amount.Chinese Patent Application No. 97116979.9 discloses " pre-dephosporizing method for molten iron ", and the method utilizes converter and uses the pre-dephosphorization of synthetic slag.Consist of CaO (55-70%)-ferriferous oxide (15-30%)-CaF
2(4-10%)-Na
2cO
3(4-9%) or CaO (50-70%)-ferriferous oxide (15-35%)-CaF
2(5-15%).By this invention, dephosphorization of molten iron rate can reach 85-90% and waste residue amount is low.But, due to CaF
2and Na
2cO
3consumption large, in Converter, the corrosion of refractory materials will be very serious, and due to Na
+the recycling of waste residue is limited with the stripping of F-.Chinese Patent Application No. 200680041842 discloses " the dephosphorization treatment method of molten iron ", and the method carries out dephosphorization of molten iron by oxygen and dephosphorizing agent being together blown into molten iron bath face in converter.By this invention, in molten iron, phosphorus content can drop to 0.012-0.02% from 0.105-0.124%, and lime consumption is within the scope of 3.3-9.6kg/t.But this method requires extremely strict to equipment and steel-making with auxiliary material, be difficult to apply in most steel mill.Japan number of patent application 2005-17018 discloses " smelting process (the molten System method of high charcoal element Very low り ん Steel) of high carbon electrode Low-phosphorus Steel ", the method calculates system accumulation oxygen amount to predict FeO content in slag by gas analysis system for converter, then controls end phosphorus content by adjustment Yang rifle Qiang Wei ﹑ oxygen flow and Bottom Blowing Gas Flow Rate and is less than 0.015%.But the current domestic most steel mill of analysis of fumes system used in the method does not possess or is also in development.
In converter, the phosphorus in molten iron is generally removed by oxidizing reaction, and its simple chemical equation is such as formula shown in (1).
2[P]+5[O]+3CaO＝3CaO·P
2O
5 (1)
From thermodynamic consideration, Jiang Di Wen Du ﹑ improves CaO content (or basicity) and increase oxygen position in slag and is conducive to the carrying out of dephosphorisation reaction.But too low the being unfavorable for slag of temperature, and reduce dephosphorisation reaction speed, in slag, CaO too high levels can impact slag, is unfavorable for dephosphorization.In actual production process, adjustment oxygen lance position and oxygen flow are one of effective ways improving the behavior of slag physical chemistry.
Summary of the invention
The object of the invention is to provide a kind of top blown converter to improve dephosphorization rate to produce the method for bonding wire steel, because top blown converter dynamic conditions is more far short of what is expected than combined blown converter, by adding a large amount of agglomerate to control temperature in early stage.Its object, in order to increase the churning time of molten iron at cold stage, increases slag internal oxidition iron simultaneously, thus improves dephosphorization efficiency to 93.3%, meet the needs of production.
Phosphorus mass percentage is the molten iron of 0.14 ~ 0.15%, adopts two slag technique to smelt in top-blown oxygen converter.Converter smelting process route is: add steel scrap, molten iron-bessemerize dephosphorization-deslagging-bessemerize dephosphorization decarburization-converter tapping.Converter smelting slag dual alkalinity in early stage is 2.2, TFe massfraction 18%, and bath temperature is 1340-1360 DEG C, and deslagging amount reaches 50% ~ 60%, thus at utmost to make in molten iron that phosphorus is oxidized enters slag, pours out high phosphorus slag; Decarburizing phase converter smelting conveniently operates, and converter terminal dual alkalinity R is 3.2 ~ 3.5, TFe mass percentage is 18 ~ 19%, and terminal temperature situation is: 1640 ~ 1660 DEG C.Adopt this production technique to be conducive to initial smelting period to react at the slag steel of cold stage, ensure that total dephosphorization rate reaches 93.3%.Concrete technology operation is as follows:
1) percentage composition 0.015 ~ 0.025% of the percentage composition 0.14 ~ 0.15%, S of the percentage composition 0.43 ~ 0.5%, P of the percentage composition 0.53 ~ 0.6%, Mn of the percentage composition 4.3 ~ 4.5%, Si of molten iron C used, temperature 1310 ± 5 DEG C;
2) load steel scrap, hot metal charging in converter, Intake Quantity is 65 tons ± 2 molten iron, and 7 tons ± 1 steel scrap, shakes straight converter;
3) in converter blowing in early stage dephosphorization smelting process, reinforced situation is: lower oxygen rifle, opens and blows rear interpolation slag charge lime, agglomerate; According to molten iron Si content adjustment lime adding amount, control slag target basicity R (CaO/SiO
2) be 2.0 ~ 2.3, iron ore add-on controls by 40 ~ 45kg/t steel, adopts agglomerate, and controlling Primary period end temp is 1340-1380 DEG C;
4) in converter blowing in early stage dephosphorization smelting process, oxygen supply situation is: open when blowing to oxygen blow duration 4 minutes, the oxygen supply intensity that oxygen rifle adopts: ton steel 2.8 ~ 3.0Nm
3/ min, rifle position 1.0 ~ 1.2m; The oxygen lance blow head exit Mach number adopted is 2.0, and orifice number is 4 holes, and between hole, angle is 12 degree 20 ~ 12 degree 40 points;
5) oxygen blast is after 4 minutes, and grate pours out 50 ~ 60% slags.
6) bessemerizing the dephosphorization carbon rejection process situation of feeding in raw material is: in converter, add lime, agglomerate slag making, ore add-on 13 ~ 18kg/t steel, and control slag dual alkalinity R is 3.2 ~ 3.5, TFe mass percentage is 18 ~ 19%;
7) bessemerizing dephosphorization carbon rejection process oxygen supply situation is: oxygen supply by lance intensity is 3.5 ~ 3.8Nm
3/ mint, rifle position 1.5 ~ 2.0m.
8) bessemerizing dephosphorization carbon rejection process terminal temperature situation is: 1640 ~ 1660 DEG C.
9) control of end point carbon percentage composition is percentage composition≤0.012% of 0.04 ~ 0.05%, P.
Step 6) described in agglomerate composition: TFe% percentage composition is>=50%, SiO
2percentage composition is≤7%, CaO percentage composition is 12 ~ 13%, and percent water is≤2%, granularity 10 ~ 30mm..
Blow compared with non-dephosphorization molten iron technology with at present conventional top and bottom combined blown converter, tool of the present invention has the following advantages:
1) take full advantage of the thermodynamic condition of top blown converter blowing dephosphorization, compensate for the shortcoming of the dynamic conditions deficiency of top blown converter dephosphorization.
2) by adding a large amount of agglomerate (53 ~ 61kg/ ton steel) dephosphorizations, early stage adds 40 ~ 45kg/ ton steel, adds 13 ~ 16kg/ ton steel after deslagging.Agglomerate melts and absorbs a large amount of heats, makes the reaction of slag steel in the time long (1340-1360 DEG C) of low temperature time remaining, is conducive to dephosphorization.
3) add a large amount of agglomerate (53 ~ 61kg/ ton steel), the ore add-on (35 ~ 43kg/ ton steel) of the original working method that compares, makes steel technology significantly reduce 9kg/ ton steel, considerably reduces smelting cost.
4) adopt conventional dephosphorization raw material, improve physics-chem characteristic between slag steel by control oxygen lance position and oxygen flow.
5) high phosphorus hot metal cost is low, can be used for reducing costs.
Embodiment
Following table 1 to table 5 lists the dephosphorization technology key parameter example adopting the present invention to smelt high phosphorus hot metal production bonding wire steel (ER50-6) on 70 tons of top-blown oxygen converters, but protection scope of the present invention is not limited in following examples.
Table 1 converter enters stove hot metal composition, massfraction %, and surplus is Fe
| Heat | C | Si | Mn | P | S |
| 1 | 4.57 | 0.53 | 0.46 | 0.14 | 0.018 |
| 2 | 4.53 | 0.57 | 0.41 | 0.147 | 0.015 |
| 3 | 4.46 | 0.56 | 0.44 | 0.141 | 0.019 |
Table 2 is bessemerized slag slag charge in earlier stage and is added situation, kg/ ton steel
| Heat | Lime | Ore |
| 1 | 21.2 | 43.1 |
| 2 | 21.4 | 43.2 |
| 3 | 21.3 | 43.0 |
Process parameter control in early stage bessemerized by table 3
| Heat | Duration of blast, min | Finishing blowing temperature, DEG C | Deslagging amount, ton |
| 1 | 4.1 | 1350 | 2.0 |
| 2 | 4.1 | 1358 | 2.0 |
| 3 | 4.0 | 1356 | 2.0 |
Dephosphorization phase slag composition bessemerized by table 4, mass percent
After table 5 deslagging, slag charge adds situation, kg/ ton steel
| Heat | Lime | Ore |
| 1 | 22.5 | 15.2 |
| 2 | 23.5 | 15.6 |
| 3 | 22.8 | 15.1 |
Table 6 converter terminal state modulator level
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (2)
1. top blown converter adopts high phosphorus hot metal to produce a dephosphorizing method for alloy bonding wire steel, it is characterized in that: processing step and control techniques parameter as follows:
1) percentage composition 0.015 ~ 0.025% of the percentage composition 0.14 ~ 0.15%, S of the percentage composition 0.43 ~ 0.5%, P of the percentage composition 0.53 ~ 0.6%, Mn of the percentage composition 4.3 ~ 4.5%, Si of molten iron C used, temperature 1310 ± 5 DEG C;
2) load steel scrap, hot metal charging in converter, Intake Quantity is 65 ± 2 tons of molten iron, and 7 ± 1 tons of steel scraps, shake straight converter;
3) in converter blowing in early stage dephosphorization smelting process, reinforced situation is: lower oxygen rifle, opens and blows rear interpolation slag charge lime, agglomerate; According to molten iron Si content adjustment lime adding amount, control slag target basicity R (CaO/SiO
2) be 2.0 ~ 2.3, iron ore add-on controls by 40 ~ 45kg/t steel, adopts agglomerate, and controlling Primary period end temp is 1340-1380 DEG C;
4) in converter blowing in early stage dephosphorization smelting process, oxygen supply situation is: open when blowing to oxygen blow duration 4 minutes, the oxygen supply intensity that oxygen rifle adopts: ton steel 2.8 ~ 3.0Nm
3/ min, rifle position 1.0 ~ 1.2m; The oxygen lance blow head exit Mach number adopted is 2.0, and orifice number is 4 holes, and between hole, angle is 12 degree 20 ~ 12 degree 40 points;
5) oxygen blast is after 4 ~ 5 minutes, and grate pours out 50 ~ 60% slags.
6) bessemerizing the dephosphorization carbon rejection process situation of feeding in raw material is: in converter, add lime, agglomerate slag making, ore add-on 13 ~ 18kg/t steel, and control slag dual alkalinity R is 3.2 ~ 3.5, TFe mass percentage is 18 ~ 19%;
7) bessemerizing dephosphorization carbon rejection process oxygen supply situation is: oxygen supply by lance intensity is 3.5 ~ 3.8Nm
3/ mint, rifle position 1.5 ~ 2.0m.
8) bessemerizing dephosphorization carbon rejection process terminal temperature situation is: 1640 ~ 1660 DEG C.
9) control of end point carbon percentage composition is percentage composition≤0.012% of 0.04 ~ 0.05%, P.
2. dephosphorizing method according to claim 1, is characterized in that: step 6) described in agglomerate composition: TFe% percentage composition is>=50%, SiO
2percentage composition is≤7%, CaO percentage composition is 12 ~ 13%, and percent water is≤2%, granularity 10 ~ 30mm.
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|---|---|---|---|
| CN201410470076.0A CN104263875B (en) | 2014-09-15 | 2014-09-15 | A kind of top blown converter adopts high phosphorus hot metal to produce the dephosphorizing method of alloy bonding wire steel |
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|---|---|---|---|
| CN201410470076.0A CN104263875B (en) | 2014-09-15 | 2014-09-15 | A kind of top blown converter adopts high phosphorus hot metal to produce the dephosphorizing method of alloy bonding wire steel |
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| CN104263875A true CN104263875A (en) | 2015-01-07 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105671237A (en) * | 2016-03-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting |
| CN108796162A (en) * | 2018-07-04 | 2018-11-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method and method for making steel of semisteel smelting converter quick dephosphorization |
| CN112695147A (en) * | 2020-12-18 | 2021-04-23 | 芜湖新兴铸管有限责任公司 | Low-oxygen steel tapping production method for bearing steel converter |
| CN113930575A (en) * | 2021-09-23 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Converter double-slag smelting method for high-silicon high-phosphorus molten iron |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105671237A (en) * | 2016-03-17 | 2016-06-15 | 武钢集团昆明钢铁股份有限公司 | Low-cost slagging and dephosphorizing technique for high-phosphorus molten iron through converter smelting |
| CN108796162A (en) * | 2018-07-04 | 2018-11-13 | 攀钢集团攀枝花钢铁研究院有限公司 | A kind of method and method for making steel of semisteel smelting converter quick dephosphorization |
| CN108796162B (en) * | 2018-07-04 | 2020-04-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Rapid dephosphorization method for semisteel smelting converter and steelmaking method |
| CN112695147A (en) * | 2020-12-18 | 2021-04-23 | 芜湖新兴铸管有限责任公司 | Low-oxygen steel tapping production method for bearing steel converter |
| CN112695147B (en) * | 2020-12-18 | 2022-03-01 | 芜湖新兴铸管有限责任公司 | Low-oxygen steel tapping production method for bearing steel converter |
| CN113930575A (en) * | 2021-09-23 | 2022-01-14 | 包头钢铁（集团）有限责任公司 | Converter double-slag smelting method for high-silicon high-phosphorus molten iron |
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| CN104263875B (en) | 2016-03-02 |
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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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