CN101314805B - High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace - Google Patents
High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace Download PDFInfo
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- CN101314805B CN101314805B CN2007100230198A CN200710023019A CN101314805B CN 101314805 B CN101314805 B CN 101314805B CN 2007100230198 A CN2007100230198 A CN 2007100230198A CN 200710023019 A CN200710023019 A CN 200710023019A CN 101314805 B CN101314805 B CN 101314805B
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- dephosphorization
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- 238000003723 Smelting Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002184 metal Substances 0.000 title claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 17
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000001301 oxygen Substances 0.000 claims abstract description 49
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 49
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000002893 slag Substances 0.000 claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 33
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 25
- 229910052742 iron Inorganic materials 0.000 claims abstract description 22
- 239000011574 phosphorus Substances 0.000 claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 17
- 239000010959 steel Substances 0.000 claims abstract description 17
- 235000012255 calcium oxide Nutrition 0.000 claims abstract description 14
- 239000000292 calcium oxide Substances 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 10
- 239000004615 ingredient Substances 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 229910052717 sulfur Inorganic materials 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 claims description 2
- 239000000395 magnesium oxide Substances 0.000 claims description 2
- 238000012423 maintenance Methods 0.000 claims description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 235000000396 iron Nutrition 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 241001062472 Stokellia anisodon Species 0.000 description 4
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- DPTATFGPDCLUTF-UHFFFAOYSA-N phosphanylidyneiron Chemical compound [Fe]#P DPTATFGPDCLUTF-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- 241001503485 Mammuthus Species 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010436 fluorite Substances 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000005028 tinplate Substances 0.000 description 1
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Abstract
The invention relates to an efficient dephosphorization smelting method in a medium phosphorus hot metal converter, which mainly solves the technical problems that the existing dephosphorization agent contains large amount of fluorites, the environmental pollution is easy to be caused, the smelting cost is too high, etc. The smelting method comprises the steps as follows: (a) the top-bottom composite smelting is adopted, the material components of metal main material which is put in have the weight percentage that the molten iron is 85 to 93 percent, and scrap steel or pig irons are 7 to 15 percent; (b) the dephosphorization smelting oxygen is controlled in the prior period; (c) slagging material containing MgO is added at the back part of a downwards-blowing gun, wherein, quicklime is added to control the binary basicity to range from 2.0 to 3.0, and iron ore is added in to adjust the slag discharge temperature in prior period until the temperature reach 1470 DEG C; (d) the slag discharge control in the dephosphorization prior period comprises the steps that the oxygen blowing quantity is controlled to be about two fifth of the oxygen blowing quantity in normal converting, the converting time is 3 to 6 minutes, and slag preventer is added in before slag discharge, wherein, the quantity of the slag preventer is 200 to 500kg; (e) later dephosphorization control has the steps that the oxygen blowing quantity is controlled, the quicklime needs to be added in order to accelerate the slag melting, the iron ore is added in to control the end point temperature to be less than or equal to 1650 DEG C. The efficient dephosphorization smelting method is suitable for a large converter to execute the deep dephosphorization smelting.
Description
Technical field: the present invention relates to a kind of molten iron converter dephosphorization smelting process, particularly a kind of medium-phosphorus hot metal converter high efficiency dephosphorating smelting process.Being specially adapted to mammoth conveter (150 tons and more than) carries out deep dephosphorization and smelts.
Background technology: phosphorus is a kind of impurity element that exists in molten iron and the molten steel, and what of its content finally are related to the especially height of some special steel kind quality of steel product.Over nearly 20 years,,, the Composition Control of steel is required to reach the degree of intimate harshness to the demands for higher performance of steel along with industrial expansions such as national defence, aviation and space flight, oil, automobile, microelectronicss.A large amount of high-quality steel require phosphorus content to be lower than 0.015%; Phosphorus is lower than 0.010% in Cryogenic Steel pipe, special deep drawing steel, the tin plate requirement steel; Some aviations, nuclear power, corrosion-resistant pipeline require phosphorus to be lower than 0.005% with steel.Medium-phosphorus hot metal is meant that the weight percent of the content of phosphorus in the molten iron is: 0.15～0.3%, traditional dephosphorization of molten iron is that two block converters carry out, and converter elder generation dephosphorization, the molten steel that has taken off phosphorus carry out decarburization and smelt converting another converter, prolonged the production cycle for this reason, and consumed high.And use dephosphorizing agent in the nearest dephosphorizing technology, and contain a large amount of fluorites in its composition, environment is polluted, converter current is smelted substantially need not be with the slag making material of fluorite, and the dephosphorizing agent cost is than converter slag-making material height such as ores.Chinese patent application CN03146206.5 discloses a kind of converter steel making method, mainly comprises: adopt weak oxygen supply mode in earlier stage at converter smelting, and add dephosphorizing agent, whole process has certain requirement to the bottom blowing flow.Chinese patent application CN03128987.8 discloses " converter oxygen nitrogen top blast dephosphorizing method ", mainly in top and bottom combined blown converter, adopt top blowing oxygen nitrogen, bottom blowing nitrogen or other rare gas elementes to carry out dephosphorization treatment, the top rifle has two kinds of source of the gas master modes, carries out nitrogen oxygen and mix and to blow or oxygen nitrogen intermittently blows in dephosphorization oxygen blast process.
Summary of the invention: the purpose of this invention is to provide a kind of medium-phosphorus hot metal converter high efficiency dephosphorating smelting process, mainly solve existing dephosphorizing agent and contain a large amount of fluorites, cause easily environmental pollution and smelting cost too high, smelt the slower technical problem of rhythm.
Technical scheme of the present invention is: a kind of medium-phosphorus hot metal converter high efficiency dephosphorating smelting process may further comprise the steps:
A, the employing top compound smelting in the end, the feed composition weight percent that drops into the metal major ingredient is: molten iron is 85～93%, and steel scrap or pig are 7～15%;
The control of b, the logical oxygen of dephosphorization smelting in early stage: open and blow the preceding 0～500Nm in back
3The oxygen supply intensity of amount of oxygen is 3.0～3.8Nm
3/ t.min; Changing slag oxygen supply intensity in early stage is 2.0～2.3Nm
3/ t.min, blowing oxygen quantity are 1/8 of total blowing oxygen quantity; Changing slag residue adjustment phase oxygen supply intensity is 2.3～2.7Nm
3/ t.min, blowing oxygen quantity are 2/8 of total blowing oxygen quantity;
C, after blowing down rifle, add the slag making material contain MgO, the slag making material package is drawn together MgO, unslaked lime and iron ore, wherein to account for the weight percent of slag making material be 5.0～7.0% to MgO, adds unslaked lime control dual alkalinity then 2.0～3.0, and adding iron ore, to regulate slagging in early stage temperature be 1470 ℃;
D, dephosphorization slagging in early stage control: the control blowing oxygen quantity is about 2/5 of a normal blowing blowing oxygen quantity, and duration of blast is 3～6min, adds 200～500 kilograms before the slagging and presses the slag agent, and its major ingredient is:
TFe:45～65%, CaO:6～10%, SiO
2≤ 10%, MgO:0.8-4%, P≤0.4%, S≤0.25%, moisture content≤0.8%; Pour out 1/3～1/2 pre-slag then;
E, later stage dephosphorization control: 100～500Nm behind the following rifle
3The blowing oxygen quantity oxygen supply intensity is 2.3～2.7Nm
3/ t.min, 100～500Nm
3Its blowing oxygen quantity oxygen supply intensity was 3.0～3.8Nm after blowing oxygen quantity was supplied with and finished
3/ t.min, for the quickeningization slag need add unslaked lime, the add-on of unslaked lime is: 15～20kg/t.sl adds iron ore control terminal temperature≤1650 ℃.
Molten iron Chemical Composition weight percent is C:4.0～4.7%, Si:0.3～0.8%, Mn:0.2～0.3%, P:0.18～0.21%, S:0.002～0.011%, the same molten iron of its phosphorus content of steel scrap or pig, in smelting process, need the converter bottom blowing is controlled the long-pending maintenance of converter carbon oxygen≤26 (unit is PPm * 100, keeps good bottom blowing effect).
The invention has the beneficial effects as follows: metal charge reasonable ratio of the present invention, accelerate to smelt rhythm by the blowing oxygen quantity of control different times, converter smelting mainly is the dephosphorization phase in earlier stage, employing is than the mode of the low slightly oxygen supply of normal oxygen supply intensity, main purpose is to be beneficial to the early stageization slag and to increase TFe content in the pre-slag, by adding the unslaked lime of certain proportioning, the slag making material of ore and band MgO is adjusted the basicity of pre-slag, temperature, TFe content, promote to form early stage foamy slag, at certain amount of oxygen that blows, controlled temperature is at≤1470 ℃, the slagging of falling stove when slag is active.Add 200～500 kilograms of bands during slagging and press the slag agent to press slag, pour out 1/3～1/2 pre-slag.Decarburization initial stage 100～500Nm
3Adopt the oxygen supply mode lower slightly than normal oxygen supply intensity during amount of oxygen, being beneficial to slag recovers normal discharge afterwards, and when guaranteeing terminal temperature≤1650 ℃ by adding a small amount of lime and ore, the converter dephosphorization rate reaches more than 95%.Wherein the dephosphorization rate calculation formula is: (going into phosphorus content in the tapping of stove molten iron phosphorus content-converter smelting endpoint)/go into stove molten iron phosphorus content.The difference of contrast patent is that the present invention adopts hypoxemia flow slightly in earlier stage at converter smelting in the present invention and the background technology, focuses on the slag making in early stage and presses slag.
Embodiment:
According to the low-phosphorous method of medium-phosphorus hot metal converter smelting of being invented, in 150 tons converter, smelted 10 stoves, its major metal material is molten iron, steel scrap and pig (the same molten iron of phosphorus content).Metal charge ratio and molten iron phosphorus content see Table 1.Converter smelting carries out dephosphorization treatment in earlier stage, adds unslaked lime and ore.Early stage, dephosphorization finished the agent of back adding pressure slag, and concrete composition and usage quantity see Table 2.After the deslagging, the slag situation adds lime and ore carries out residue adjustment according to changing.The oxygen supply intensity of whole process sees Table 3.Smelt gained terminal point Chemical Composition and see Table 4.
Table 1. is implemented main raw material proportioning and molten iron parameter
Table 2. implements to add pressure slag dosage and Chemical Composition
Table 3. implementation process oxygen supply intensity (oxygen step is meant the oxygen amount of meter when beginning to blow)
Table 4. smelting endpoint Chemical Composition and tapping temperature
Claims (4)
1. medium-phosphorus hot metal converter high efficiency dephosphorating smelting process may further comprise the steps:
A, the employing top compound smelting in the end, the feed composition weight percent that drops into the metal major ingredient is: molten iron is 85～93%, and steel scrap or pig are 7～15%;
The control of b, the logical oxygen of dephosphorization smelting in early stage: open and blow the preceding 0～500Nm in back
3The oxygen supply intensity of amount of oxygen is 3.0～3.8Nm
3/ t.min; Changing slag oxygen supply intensity in early stage is 2.0～2.3Nm
3/ t.min, blowing oxygen quantity are 1/8 of total blowing oxygen quantity; Changing slag residue adjustment phase oxygen supply intensity is 2.3～2.7Nm
3/ t.min, blowing oxygen quantity are 2/8 of total blowing oxygen quantity;
C, after blowing down rifle, add the slag making material contain MgO, the slag making material package is drawn together MgO, unslaked lime and iron ore, wherein to account for the weight percent of slag making material be 5.0～7.0% to MgO, adds unslaked lime control dual alkalinity then 2.0～3.0, and adding iron ore, to regulate slagging in early stage temperature be 1470 ℃;
D, dephosphorization slagging in early stage control: the control blowing oxygen quantity is 2/5 of a normal blowing blowing oxygen quantity, and duration of blast is 3～6min, adds 200～500 kilograms before the slagging and presses the slag agent, and its major ingredient is:
TFe:45～65%, CaO:6～10%, Si0
2≤ 10%, MgO:0.8-4%, P≤0.4%, S≤0.25%, moisture content≤0.8%; Pour out 1/3～1/2 pre-slag then;
E, later stage dephosphorization control: 100～500Nm behind the following rifle
3The blowing oxygen quantity oxygen supply intensity is 2.3～2.7Nm
3/ t.min, 100～500Nm
3Its blowing oxygen quantity oxygen supply intensity was 3.0～3.8Nm after blowing oxygen quantity was supplied with and finished
3/ t.min, for the quickeningization slag need add unslaked lime, the add-on of unslaked lime is: 15～20kg/t.sl adds iron ore control terminal temperature≤1650 ℃.
2. medium-phosphorus hot metal converter high efficiency dephosphorating smelting process according to claim 1 is characterized in that the weight percent of described its chemical ingredients of molten iron is:
C:4.0～4.7%, Si:0.3～0.8%, Mn:0.2～0.3%, P:0.18～0.21%, S:0.002～0.011%, surplus is Fe.
3. medium-phosphorus hot metal converter high efficiency dephosphorating smelting process according to claim 1 is characterized in that, the same molten iron of its phosphorus content of steel scrap or pig.
4. medium-phosphorus hot metal converter high efficiency dephosphorating smelting process according to claim 1 is characterized in that, in smelting process, needs the converter bottom blowing is controlled, and converter carbon oxygen amasss maintenance≤26PPm * 100.
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| CN2007100230198A CN101314805B (en) | 2007-05-31 | 2007-05-31 | High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace |
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| CN2007100230198A CN101314805B (en) | 2007-05-31 | 2007-05-31 | High-efficiency dephosphorization smelting method for medium phosphor hot metal revolving furnace |
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| CN101314805B true CN101314805B (en) | 2010-10-13 |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696462B (en) * | 2009-11-03 | 2011-06-29 | 攀钢集团研究院有限公司 | Method for producing low phosphorus steel by smelting semisteel |
| CN101831525B (en) * | 2010-05-19 | 2012-01-25 | 首钢总公司 | Dephosphorization method for molten iron |
| CN101824506B (en) * | 2010-05-28 | 2012-04-18 | 攀枝花钢城集团有限公司 | Converter slag pressing agent and converter slag pressing method |
| CN103060509B (en) * | 2012-03-31 | 2015-03-18 | 上海梅山钢铁股份有限公司 | High-silicon molten iron smelting method |
| CN102839251B (en) * | 2012-09-13 | 2015-01-21 | 首钢总公司 | Smelting method of low-phosphorous steel |
| CN103695601B (en) * | 2012-09-27 | 2015-04-22 | 上海梅山钢铁股份有限公司 | Processing method of molten steel used for checkered plate smelted in converter |
| CN104250672B (en) * | 2014-05-29 | 2016-04-20 | 莱芜钢铁集团有限公司 | A kind of method of combined blown converter high efficiency dephosphorating |
| CN105525055B (en) * | 2014-09-30 | 2017-09-12 | 上海梅山钢铁股份有限公司 | A kind of control method of converter less-slag melting carbon period splash |
| CN105039647A (en) * | 2015-06-23 | 2015-11-11 | 武汉钢铁(集团)公司 | LF furnace shallow dephosphorization refining method |
| CN105039634B (en) * | 2015-08-27 | 2017-10-31 | 宝山钢铁股份有限公司 | A kind of dephosphorization method of convertor steelmaking process |
| CN107365886B (en) * | 2016-05-13 | 2019-03-26 | 上海梅山钢铁股份有限公司 | A kind of method of converter high temperature dephosphorization |
| CN106048129B (en) * | 2016-07-11 | 2017-10-10 | 湖南华菱涟源钢铁有限公司 | Converter high-carbon low-phosphorus end point control metallurgy method under phosphorus high-molten iron condition |
| CN106498114B (en) * | 2016-11-22 | 2018-09-18 | 首钢京唐钢铁联合有限责任公司 | Dephosphorization converter blowing control method |
| CN109055853B (en) * | 2018-07-24 | 2019-10-18 | 山东钢铁股份有限公司 | A kind of low-carbon sulphur system Cutting free ribbon steel and its production method |
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