CN101117651A - Converting process for converter low-silicon molten iron - Google Patents
Converting process for converter low-silicon molten iron Download PDFInfo
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- CN101117651A CN101117651A CNA200610029561XA CN200610029561A CN101117651A CN 101117651 A CN101117651 A CN 101117651A CN A200610029561X A CNA200610029561X A CN A200610029561XA CN 200610029561 A CN200610029561 A CN 200610029561A CN 101117651 A CN101117651 A CN 101117651A
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Abstract
The present invention provides a siliconeisen iron melt blowing and refining method in a converter, and the method includes the steps as follows: (1) waste steel and iron melt are loaded into the converter, and oxygen blowing and steel making begin, the oxygen flux is 900Nm3/min to 1050Nm3/min, the height that the oxygen gun spraying head departs the metal liquid surface in the melt pond is 1.8-3.0m; (2) a first batch of slag charge is added after oxygen is blown in the first batch of the slag charge is 60-80 percent of the total slag charge, and the rest slag charge can be charged in 2-3 batches after the first batch of the slag charge is melted. The consumption of the slag charge: the lime 18-28kg/t steel, the light calcined dolomite 15-25kg/t steel, the ironstone 5-10kg/t steel, the carbonaceous heat generating agent 0-7kg/t steel, the compound slag 0-6kg/t steel; and the rest process are same as the prior art. The oxygen blowing duration of the present invention decreases 1.8min per furnace averagely, and the problem that the heat quantity is short and the slag forming is difficult can be solved simultaneously, and the present invention can make the converter steel-making to produce efficiently.
Description
Technical field
The invention belongs to the oxygen converter steelmaking field, be mainly used in the efficient blowing of large and medium-sized converter hot metal containing low silicon.
Background technology
The technical process of traditional converter steelmaking generally comprises following steps: main raw material calculating-converter dress steel scrap-converter dress molten iron-oxygen rifle decline oxygen blast-converter adds mensuration-converter blow off in slag charge slag making-sublance blowing-sublance thermometric sampling-tapping blowing.
Concrete processing parameter control is as follows:
Main raw material calculates: at first calculate the steel scrap and the iron water amount of converter needs according to furnace output, molten steel recovery rate and the hot metal ratio of converter,
Converter dress steel scrap-converter dress molten iron-oxygen rifle decline oxygen blast:
Mammoth conveter generally adopts dress steel scrap earlier, refills the process system of molten iron, and after converter was vertical, the oxygen rifle began oxygen blast when dropping to apart from converter molten pool liquid level certain position, and oxygen flow is 833Nm
3/ min, oxygen lance blow head in 2.0～2.7m scope, add slag making materials apart from the molten pool metal liquid surface height controlling then in converter,
Converter adds the slag charge slag making: slag making materials mainly contains lime, light dolomite and ore, lime loss per ton steel 29～35kg, and light dolomite loss per ton steel 15～25kg, iron ore loss per ton steel 10～15kg,
Mensuration-converter blow off in the sublance blowing-sublance thermometric sampling-tapping blowing: when blowing apart from blow off 2min, the sublance that probe is housed drops to the temperature of measuring molten steel in the converter molten pool, carbon content is also got the steel sample, for determining that the converter blow off provides data, sublance is measured the rear converter dynamicmodel and is started (i.e. liquid steel temperature and the crystalline carbon content of measuring according to sublance, calculate according to the cooling performance of existing decarburization curve and heating curve and iron ore in the model and to reach target blow off temperature and aim carbon content and need to continue the amount of oxygen of blowing and the iron ore of adding, this dynamicmodel belongs to routine techniques, do not repeat them here) and calculate and also need the amount of oxygen that blows, the oxygen rifle rises and stops oxygen blast after the amount of oxygen target of the amount of oxygen arrival converter dynamicmodel calculating that reality blows, the sublance that probe is housed drops to be measured the temperature of blow end point molten steel and gets the steel sample in the molten bath, the steel sample is sent to analyzer room's analytical chemistry composition, after the chemical ingredients of steel sample satisfies steel grade and requires, the converter of fascinating begins tapping, molten steel in the converter is poured into ladle, so just finished the smelting of one heat steel.
Before 2002, the silicon content of hot metal of Baosteel converter steelmaking is 0.30～0.50%, and molten iron silicon content is reduced to 0.15～0.30% after 2002.Blast furnace molten iron silicon content reduces by 0.1%, can improve output 1～1.5%, reduces coke ratio 4kg/t iron.Blast furnace is produced hot metal containing low silicon and is brought very big economic benefit to Steel Plant.When silicon content of hot metal is 0.30～0.50%, above-mentioned existing converter steelmaking process can normally be smelted needed steel grade and better economic results is arranged.But when silicon content of hot metal reduced, original 250 tons of converter steelmaking process (4 hole shower nozzle oxygen blast, single slag) blowing hot metal containing low silicon technology had but run into challenge.Because the silicone content in the molten iron reduces, the heat that oxidizing reaction produced of molten iron silicon obviously reduces in the process of bessemerizing, the SiO of generation
2The also corresponding minimizing of content, tricalcium silicate that generates when lime adding amount is constant and Dicalcium Phosphate (Feed Grade) content increase, and the temperature of fusion height of tricalcium silicate and Dicalcium Phosphate (Feed Grade), so the temperature of fusion of slag raises mobile variation; Simultaneously, the oxygen blast flow that 5 hole shower nozzle oxygen blast each hole when identical oxygen blast flow is compared in 4 hole shower nozzle oxygen blast increases, and penetration depth increases, and the iron oxide content in the slag reduces, and is unfavorable to the fusing of lime, also causes converter slag difficulty; Because converter slag difficulty, the slag bubble level reduces, thereby the metal splash takes place often, causes problems such as sticking oxygen rifle in the steelmaking process, sticking fire door, sticking petticoat pipe and dephosphorization difficulty.The metal splash increases iron and steel stock consumption.The adhesive of cleaning oxygen rifle, fire door, petticoat pipe will take the production time, and is also dangerous.Dephosphorization rate reduces, and production high-quality steel is added to the difficulties.
240 tons of converters of U.S. Inland Steel are taked hypoxemia flow (44179Nm for solving hot metal containing low silicon steel-makingization slag difficult problem
3/ h), oxygen supply intensity 3.01Nm
3The working method of/t.min and soft blow.The shortcoming of this method is that the oxygen blow duration of every stove steel is long.
The measure that hot metal containing low silicon improvementization slag condition is bessemerized by Holland Huo Gewen steel mill mainly is to adopt the adding converter to return slag, to increase the quantity of slag and the formation of accelerating the initial stage slag.Jet performance and oxygen flow for oxygen lance blow head are not effectively studied.
SUMITOMO CHEMICAL metal Wakayama steelworks adopts duplex practice to solve hot metal containing low silicon steel-making problem, i.e. SRP (simple refinery practice) method (desiliconization in 1 converter, dephosphorization, another converter decarburization, intensification).When blowing with single slag process, they fail to solve the change slag problem that hot metal containing low silicon is made steel well, and think that the too high dephosphorization effect of basicity of slag is bad, and converter slag is difficult to utilize and the experience of not achieving success.
For this reason, press for the converting method that finds a kind of hot metal containing low silicon of converter efficiently.
Summary of the invention
The converting method that the purpose of this invention is to provide a kind of converter hot metal containing low silicon improves converter productivity, prolongs the shower nozzle life-span, reduces metal consumption and reach higher dephosphorization rate.
For achieving the above object, the present invention at first provides a kind of converting method of converter hot metal containing low silicon, and it comprises the steps:
(1) at converter tapping and after carrying out slag splashing, the steel scrap of packing into, hot metal containing low silicon begin Oxygen Furnace Steel, and oxygen flow is 900Nm
3/ min～1050Nm
3/ min, oxygen lance blow head is 1.8～3.0m apart from the molten pool metal liquid level;
(2) add first slag charge after the beginning oxygen blast, account for 60～80% of total slag charge amount, all the other slag charges divide 2～3 batches of addings in the back well in first slag chargeization; Slag charge consumption: lime 18～28kg/t steel, light dolomite 15～25kg/t steel, iron ore 5～10kg/t steel, carbonaceous heat-generating agent 0～7kg/t steel, synthetic slag 0～6kg/t steel;
(3) when blowing oxygen quantity reaches total blowing oxygen quantity 90%, measure molten steel composition and temperature, and adjust blowing oxygen quantity and refrigerant add-on according to dynamic control model with sublance;
(4) when actual blowing oxygen quantity reaches the amount of oxygen preset value of dynamic control model calculating, mention the oxygen rifle and stop blowing, when reaching the blow off target value, molten steel composition and temperature tap.
Preferably, the composition weight percent of above-mentioned hot metal containing low silicon is:
C：4.1～4.6；
Si：0.10～0.30；
Mn：0.20～0.45；
P：0.010～0.12；
S：0.002～0.020；
All the other are Fe and inevitable impurity.
Preferable, the composition weight percent of synthetic slag is:
Fe
2O
3And FeO:55～65;
CaO：8～15；
MgO：5～8；
Al
2O
3：≤5.0；
SiO
2：≤8.0；
S：≤0.05；
P：≤0.05；
H
2O：≤0.5；
All the other are Fe and inevitable impurity.
Best, contain 5 equally distributed spray orifices according to the used oxygen lance blow head of the converting method of converter hot metal containing low silicon of the present invention.
Main technique control is as follows:
1. preparation work:
1) designs novel oxygen lance blow head
1. designed the new 5 hole shower nozzles that are applicable to the efficient blowing of mammoth conveter hot metal containing low silicon, new oxygen lance blow head increases a spray orifice than former oxygen lance blow head, makes the steel-smelting furnace surface increase a fire point reaction zone.The spray orifice inclination angle is strengthened, and makes the reaction zone area increase helping of both slag.This having of oxygen lance blow head slag is good, and splash is few, the advantage that oxygen flow is big.
The aditus laryngis total area 94.29cm of 2. new shower nozzle
2, more former shower nozzle increases by 11%.New shower nozzle oxygen flow is big, can shorten oxygen blow duration.
3. new oxygen lance blow head adopts red copper vacuum casting technology to make.The purity height of vacuum casting shower nozzle copper, dense structure, shower nozzle has good thermal conductivity and long life-span.
2) develop a kind of synthetic slag
In order to improve hot metal containing low silicon steel-makingization slag difficulty, developed a kind of synthetic slag, to accelerate lime fusing in the convertor steelmaking process, make slag that good flowability and suitable basicity be arranged.Its composition (seeing Table 1) and preparation method are as follows:
1. synthetic slag composition
Table 1
| Composition | Fe 2O 3And FeO | CaO | MgO | Al 2O 3 | SiO 2 | S | P | H 2O |
| Weight percent (wt%) | 55～65 | 8～15 | 5～8 | ≤5.0 | ≤8.0 | ≤0.05 | ≤0.05 | ≤0.5 |
2. synthetic slag preparation method
Raw material is selected converter dust-removing ash, Wingdale and magnesia for use, carries out proportioning according to synthetic slag composition scope, at room temperature fully adds an amount of binding agent behind the mixing and carries out briquetting and form, and granularity is controlled according to 25～40mm.
2. processing parameter control:
1. hot metal containing low silicon condition
The hot metal containing low silicon chemical ingredients is: C 4.1～4.6%, and Si 0.10～0.30%, and Mn 0.20～0.45%, and P 0.010～0.12%, and S 0.002～0.020%.
2. technical process: main raw material calculating-converter dress steel scrap-converter dress molten iron-oxygen rifle decline oxygen blast-converter adds mensuration-converter blow off-sublance thermometric sampling-tapping in slag charge slag making-sublance blowing, and wherein oxygen rifle decline oxygen blast system and converter add the slag charge slagging regime and prior art has bigger improvement.
3. oxygen supply system
Consider the ability that the converter gas treatment system is handled the flue gas that produces in the process of bessemerizing, comprise abilities such as cooling to flue gas, udst separation, and in order to prevent that the oxygen blast flow is excessive and cause factors such as splash, determining to bessemerize the converter oxygen flow is 900～1050Nm
3/ min, this pipe pressure of oxygen is 1.5Mpa, oxygen lance blow head is 1.8～3.0m apart from the molten pool metal liquid level.
Because oxygen is mainly used in the decarburizing reaction in the converter steelmaking process, generally speaking, the amount of oxygen that one heat steel needs changes little, when oxygen flow keeps certain value, the duration of blast of converter also is a certain value, therefore, when the oxygen flow increase, the duration of blast of converter just shortens, improved the efficient of converter, therefore, for improving converter efficient, oxygen flow of the present invention is at least 900Nm
3/ min.But simultaneously, when oxygen flow increases, because CO and CO that reaction between carbon and oxygen generates
2Gas also can increase, and just needs to consider processing power and the exhaust capacity of converter dedusting line to flue gas, because 250 tons of converter gas flow maximum instantaneous value upper limits require less than 3500m
3/ min, so the maximum value of converter oxygen flow is less than 1050Nm
3/ min.Therefore, to select the converter oxygen flow be 900～1050Nm in the present invention
3/ min can improve the efficient of converter to greatest extent, can satisfy processing power and the exhaust capacity of dust-removal system to converter gas again.
Oxygen lance position of the present invention (being that oxygen lance blow head is apart from the molten pool metal liquid level) is 1.8～3.0m.Because molten iron silicon content is reduced to 0.10～0.30% from 0.30～0.50%, unfavorable to the converter slag, and in slag, increase the fusing that iron oxide content helps slag making materials such as lime, simultaneously, blowing mid-term, because reaction between carbon and oxygen is violent, ferric oxide in the slag reduces, slag easily returns the dried oxygen rifle that causes and glues cold steel, increase the metal splash, dephosphorization difficulty etc., therefore, the present invention increases oxygen lance blow head apart from the molten pool metal liquid level, increase the rifle position that is the oxygen rifle, oxygen jet reduces the penetration depth in molten bath, and the easy and metallic iron reaction generation ferric oxide of oxygen has promoted converter slag-making.
4. slagging regime
The converter of the present invention basicity (CaO/SiO that packs into
2) span of control is 4.5～7.0.Slag charge consumption: lime 18～28kg/t steel, light dolomite 15～25kg/t steel, iron ore 5～10kg/t steel, heat-generating agent 0～7kg/t steel, synthetic slag 0～6kg/t steel.
Bessemerizing needs slag making dephosphorization, desulfurization, and in order to reach this purpose, slag needs a certain amount of and has suitable basicity, and basicity generally adopts CaO/SiO
2Expression, wherein CaO is mainly derived from the slag making work stone ash of adding, SiO
2Be mainly derived from the oxidation of silicon in molten iron and the steel scrap, when the smelting molten iron silicone content is 0.30～0.50%, because the SiO that generates
2Amount is many, and is big in order to prevent that the quantity of slag from too much reaching the lime consumption amount, and the basicity span of control of packing into of converter is 3.5～5.0, and the lime loss per ton steel is 28～35kg; Because the molten iron silicon oxidation will be emitted a large amount of heats, heat has affluence in the converter, adopts iron ore to be used as refrigerant balance heat, and the iron ore loss per ton steel is generally 10～20kg.
The present invention is because molten iron silicon content is 0.10～0.30%, basicity is still according to 3.5～5.0 controls if pack into, then the amount of lime of Jia Ruing very little, the quantity of slag that generates is also few, the carrying out that is unfavorable for converter dephosphorization and desulfurization, the basicity that improves slag is all favourable to dephosphorization and desulfurization, therefore, the basicity of packing into is according to 4.5～7.0 controls, and the lime loss per ton steel is 18～28kg; On the other hand, because molten iron silicon content is low, the silicon oxidation liberated heat is few, in order to make heat balance, according to the variation of molten iron silicon content, the ton steel adds heat-generating agent 0～7kg, and the main component of synthetic slag and iron ore is a ferric oxide, for the promotion slag, the ton steel adds synthetic slag 0～6kg, and the ton steel adds iron ore 5～10kg.
Slag making material adding method: add first slag charge after the beginning oxygen blast, account for 60～80% of total slag charge amount, all the other slag charges divide 2～3 batches of addings in the back well in first slag chargeization.
5. sublance is measured in the blowing
When reaching total blowing oxygen quantity 90%, blowing oxygen quantity measures molten steel composition and temperature with sublance.After sublance is measured, the temperature of molten steel and crystalline carbon content are measured in the converter comes out, and dynamic control model is according to liquid steel temperature and the target liquid steel temperature of crystalline carbon content and converter blow off and blowing oxygen quantity and the refrigerant add-on that the aim carbon cubage goes out needs measured.Concrete grammar is: the difference of the liquid steel temperature that dynamic control model is measured according to sublance and the difference of target blow off temperature and crystalline carbon content and target blow off carbon content calculates the amount of oxygen that the needs continuation blows respectively, and (this dynamicmodel belongs to routine techniques, do not repeat them here), when the blowing oxygen quantity that satisfies target blow off temperature when satisfying the blowing oxygen quantity of target blow off carbon content, then blowing oxygen quantity is carried out according to the blowing oxygen quantity that satisfies target blow off temperature, and refrigerant such as iron ore just do not add; When the blowing oxygen quantity that satisfies target blow off temperature when satisfying the blowing oxygen quantity of target blow off carbon content, then blowing oxygen quantity is carried out according to the blowing oxygen quantity that satisfies target blow off carbon content, because blowing oxygen quantity is greater than the blowing oxygen quantity that satisfies target blow off temperature, the blowing oxygen quantity that increases raises liquid steel temperature and is higher than target blow off temperature, at this moment, dynamic control model just calculates the amount of iron ores that needs adding, utilizes iron ore to reduce liquid steel temperature and makes it to satisfy target blow off temperature.
6. blow off and tapping
When blowing oxygen quantity reaches preset value, mention the oxygen rifle and stop blowing.Adopt sublance to carry out thermometric and sampling, tap when molten steel composition and temperature reach preset value.
7. other
The steel scrap ratio solves with an amount of carbonaceous heat-generating agent of adding the problem of hot metal containing low silicon shortage of heat in the charging by regulating.Carbonaceous heat-generating agent major ingredient and granularity requirements are: T.C 〉=81%, ash≤15%, fugitive constituent≤5%; Size range 20～45mm.
Compared with prior art, the invention has the advantages that:
(1) since steelmaking process in oxygen flow by 833Nm
3/ min is increased to 900～1050Nm
3/ min makes the oxygen blow duration of every stove steel on average shorten 1.8min.In addition, because the present invention has improved the change scoriform condition of converter smelting hot metal containing low silicon, bessemerizing pre-slag can form fast, blowing has prevented that returning of slag is dried mid-term, the bubble level of slag improves, and has reduced the generation of metal splash, thereby has also reduced the generation of the sticking cold steel phenomenon of converter mouth, petticoat pipe and oxygen rifle, cleaning fire door, oxygen rifle, petticoat pipe required time reduce, and have improved the converter operating rate.Can increase production 150,000 tons of steel the whole year.
(2) because the splash of converter metal reduces, improve recovery rate of iron 0.3%, year increases benefit 3,000,000 yuan.
(3) by adding synthetic slag and optimize the oxygen supply slagging regime, and improve the oxygen lance blow head design, solved the shortage of heat and the slagging difficult problem of hot metal containing low silicon steel-making, make the converter steelmaking can high efficiency production.
(4) owing to adopt the shower nozzle good heat conductivity of red copper vacuum casting method production and the improvement of blowing condition, under the situation of blowing hot metal containing low silicon, the shower nozzle life-span is brought up to 200 stoves by average 120 stoves, and every year can be less with 40 in shower nozzle.
Description of drawings
Fig. 1 is the structural representation according to used oxygen rifle in the inventive method one preferred enforcement;
Fig. 2 be among Fig. 1 the oxygen rifle along the sectional view of A-A line.
Embodiment
The structure of oxygen rifle used in the inventive method one preferred embodiment at first is described with reference to accompanying drawing 1-2.As can be seen from Figure, converter hot metal containing low silicon of the present invention efficiently blows and is made up of rifle body 2 and shower nozzle 1 with the oxygen rifle, and both are welded to connect in employing.Rifle body 2 is made up of pipe 8 in outer tube 6, middle level water pipe 7 and the oxygen.Shower nozzle 1 is red copper casting one-piece construction, and it comprises outer wall 3, cooling stave 4, air chamber 5, spray orifice 11, stiffening web 12 and water eliminator 10.The outer wall 3 of shower nozzle links to each other with the outer tube 6 of rifle body, and the air chamber 5 of shower nozzle joins with the interior pipe 8 of rifle body, and the water coolant wall 4 of shower nozzle is slidingly connected with the middle level water pipe 7 of rifle body.Water eliminator 10 is positioned within the cooling water channel 9 of shower nozzle.
Shower nozzle has 5 spray orifices 11, is evenly distributed on shower nozzle 1 end, and the angle between two adjacent spray orifices is 72 °.In shower nozzle 1, the periphery of each spray orifice 11 all has cooling-water duct 9.The air chamber 5 of shower nozzle directly communicates with 5 spray orifices.Spray orifice is the Lavalle pass, throat diameter φ
2Be 47～52mm, exit diameter φ
1Be 63～68mm.The angle α of the central axis of each spray orifice and the central axis of spray gun is 11～14 °.
Below be specifying of the inventive method embodiment 1-3.
Embodiment 1:
(1) molten iron condition: [C] 4.6%, [Si] 0.30%, [Mn] 0.45%, [P] 0.12%, [S] 0.020%, 1345 ℃ of molten iron temperatures.
(2) oxygen lance blow head adopts the oxygen lance blow head shown in the accompanying drawing 1-2 of the present invention.
(3) converter top-blow oxygen flow 900Nm
3/ min.
(4) control of lance position: initial stage 2.3m, mid-term 2.8m, later stage 1.8m.
(5) basicity 4.5 of packing into, ton steel slag making material add-on: lime 28kg, light dolomite 15kg, iron ore 10kg.First slag making material accounts for 60% of total add-on, and all the other divide 3 batches of addings.The composition weight percent of synthetic slag is: Fe
2O
3And FeO:60%, CaO:12%, MgO:6.5%, Al
2O
3≤ 5.0%, SiO
2≤ 8.0%, S≤0.05%, P≤0.05%, H
2O≤0.5%, all the other are Fe and inevitable impurity.
(6) measure with sublance when blowing oxygen quantity reaches total blowing oxygen quantity 90%, molten steel crystalline carbon content is 0.217%, 1621 ℃ of temperature, and dynamic control model calculates that to continue blowing oxygen quantity be 1200Nm
3, the iron ore add-on is ton steel 3.2kg.
(7) Converter Oxigen Blowing time 16.7min.
(8) converter blow off molten steel composition and temperature: [C] 0.045%, [Mn] 0.127%, [P] 0.014%, [S] 0.012%, 1655 ℃ of blow off temperature.
Embodiment 2:
(1) molten iron condition: [C] 4.3%, [Si] 0.22%, [Mn] 0.30%, [P] 0.08%, [S] 0.010%, 1330 ℃ of molten iron temperatures.
(2) oxygen lance blow head adopts the oxygen lance blow head shown in the accompanying drawing 1-2 of the present invention.
(3) oxygen flow 950Nm
3/ min.
(4) control of lance position: initial stage 2.5m, mid-term 3.0m, later stage 2.0m.
(5) basicity 5.8 of packing into, ton steel slag making material add-on: lime 24kg, light dolomite 20kg, iron ore 7kg, heat-generating agent 4kg, synthetic slag 3kg.First slag making material accounts for 70% of total add-on, and all the other divide 3 batches of addings.The composition weight percent of synthetic slag is: Fe
2O
3And FeO:55%, CaO:15%, MgO:8%, Al
2O
3≤ 5.0%, SiO
2≤ 8.0%, S≤0.05%, P≤0.05%, H
2O≤0.5%, all the other are Fe and inevitable impurity.
(6) measure with sublance when blowing oxygen quantity reaches total blowing oxygen quantity 90%, molten steel crystalline carbon content is 0.164%, 1615 ℃ of temperature, and dynamic control model calculates that to continue blowing oxygen quantity be 1000Nm
3, the iron ore add-on is 0.
(7) Converter Oxigen Blowing time 15.9min.
(8) converter blow off molten steel composition and temperature: [C] 0.040%, [Mn] 0.098%, [P] 0.011%, [S] 0.008%, 1660 ℃ of blow off temperature.
Embodiment 3:
(1) molten iron condition: C 4.1%, Si 0.10%, and Mn 0.20%, and P 0.01%, and S 0.002%, 1280 ℃ of molten iron temperatures.
(2) oxygen lance blow head adopts the oxygen lance blow head shown in the accompanying drawing 1-2 of the present invention.
(3) oxygen flow 1050Nm
3/ min.
(4) control of lance position: initial stage 2.7m, mid-term 3.0m, later stage 1.9m.
(5) basicity 5.8 of packing into, ton steel slag making material add-on: lime 18kg, light dolomite 25kg, iron ore 5kg, heat-generating agent 7kg, synthetic slag 6kg.First slag making material accounts for 60% of total add-on, and all the other divide 2 batches of addings.The composition weight percent of synthetic slag is: Fe
2O
3And FeO:65%, CaO:8%, MgO:5%, Al
2O
3≤ 5.0%, SiO
2≤ 8.0%, S≤0.05%, P≤0.05%, H
2O≤0.5%, all the other are Fe and inevitable impurity.
(6) measure with sublance when blowing oxygen quantity reaches total blowing oxygen quantity 90%, molten steel crystalline carbon content is 0.181%, 1603 ℃ of temperature, and dynamic control model calculates that to continue blowing oxygen quantity be 1100Nm
3, the iron ore add-on is 0.
(7) Converter Oxigen Blowing time 15.2min.
(8) converter blow off molten steel composition and temperature: [C] 0.042%, [Mn] 0.065%, [P] 0.004%, [S] 0.003%, 1650 ℃ of blow off temperature.
Claims (4)
1. the converting method of a converter hot metal containing low silicon, it comprises the steps:
(1) at converter tapping and after carrying out slag splashing, the steel scrap of packing into, hot metal containing low silicon begin Oxygen Furnace Steel, and oxygen flow is 900Nm
3/ min～1050Nm
3/ min, oxygen lance blow head is 1.8～3.0m apart from the molten pool metal liquid level;
(2) add first slag charge after the beginning oxygen blast, account for 60～80% of total slag charge amount, all the other slag charges divide 2～3 batches of addings in the back well in first slag chargeization; Slag charge consumption: lime 18～28kg/t steel, light dolomite 15～25kg/t steel, iron ore 5～10kg/t steel, carbonaceous heat-generating agent 0～7kg/t steel, synthetic slag 0～6kg/t steel;
(3) when blowing oxygen quantity reaches total blowing oxygen quantity 90%, measure molten steel composition and temperature, and adjust blowing oxygen quantity and iron ore add-on according to dynamic control model with sublance;
(4) when actual blowing oxygen quantity reaches the amount of oxygen preset value of dynamic control model calculating, mention the oxygen rifle and stop blowing, when reaching the blow off target value, molten steel composition and temperature tap.
2. the converting method of converter hot metal containing low silicon according to claim 1 is characterized in that, the composition weight percent of described hot metal containing low silicon is:
C：4.1～4.6；
Si：0.10～0.30；
Mn：0.20～0.45；
P：0.010～0.12；
S：0.002～0.020；
All the other are Fe and inevitable impurity.
3. the converting method of converter hot metal containing low silicon according to claim 1 is characterized in that, the composition weight percent of described synthetic slag is:
Fe
2O
3And FeO:55～65;
CaO：8～15；
MgO：5～8；
Al
2O
3：≤5.0；
SiO
2：≤8.0；
S：≤0.05；
P：≤0.05；
H
2O：≤0.5；
All the other are Fe and inevitable impurity.
4. the converting method of converter hot metal containing low silicon according to claim 1 is characterized in that, described oxygen lance blow head (1) contains 5 equally distributed spray orifices (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200610029561XA CN101117651B (en) | 2006-07-31 | 2006-07-31 | Converting process for converter low-silicon molten iron |
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|---|---|---|---|
| CN200610029561XA CN101117651B (en) | 2006-07-31 | 2006-07-31 | Converting process for converter low-silicon molten iron |
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| CN101117651A true CN101117651A (en) | 2008-02-06 |
| CN101117651B CN101117651B (en) | 2010-10-13 |
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| CN101497934B (en) * | 2009-03-12 | 2011-04-20 | 浙江杭美炉料制造有限公司 | Heating slag washing material for converter steel melting, preparation and use method thereof |
| CN102071276A (en) * | 2010-12-22 | 2011-05-25 | 中钢集团邢台机械轧辊有限公司 | Method for reducing silicon content of molten iron |
| CN102373310A (en) * | 2011-10-19 | 2012-03-14 | 北京科技大学 | Method for guiding converter reblowing process operation |
| CN102766723A (en) * | 2012-06-29 | 2012-11-07 | 石家庄钢铁有限责任公司 | Limestone slagging steelmaking lance position control method for basic oxygen furnaces |
| CN102776313A (en) * | 2012-08-20 | 2012-11-14 | 武汉钢铁(集团)公司 | Method for smelting high-phosphorus steel by low-temperature low-silicon molten iron in converter |
| CN103233098A (en) * | 2013-05-13 | 2013-08-07 | 涟源市飞达冶金炉料厂 | Novel direct slag-feeding washing mixed material application method in converter tapping process |
| CN103555878A (en) * | 2013-11-25 | 2014-02-05 | 武钢集团昆明钢铁股份有限公司 | Safe and high-efficient low-silicon molten-ion blowing process |
| CN103993127A (en) * | 2014-05-30 | 2014-08-20 | 河北唐银钢铁有限公司 | Oxygen lance nozzle with concentrated streams |
| CN104711388A (en) * | 2015-02-04 | 2015-06-17 | 北京科技大学 | Low-silicon molten iron blowing method |
| CN107849624A (en) * | 2016-01-15 | 2018-03-27 | 新日铁住金株式会社 | Bessemerize method |
| CN108384916A (en) * | 2018-04-19 | 2018-08-10 | 天津钢铁集团有限公司 | A kind of control method improving steelmaking converter blowing end point carbon |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN108977611A (en) * | 2018-08-31 | 2018-12-11 | 武钢集团昆明钢铁股份有限公司 | A kind of converter hot metal containing low silicon converting method using cast steel recrement |
| CN109097522A (en) * | 2018-09-30 | 2018-12-28 | 武钢集团昆明钢铁股份有限公司 | A kind of middle high manganese high phosphorus hot metal containing low silicon improves the converter smelting method of the residual manganese of endpoint molten steel |
| CN109161634A (en) * | 2018-09-30 | 2019-01-08 | 武钢集团昆明钢铁股份有限公司 | The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting |
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| CN102071276B (en) * | 2010-12-22 | 2012-07-04 | 中钢集团邢台机械轧辊有限公司 | Method for reducing silicon content of molten iron |
| CN102373310A (en) * | 2011-10-19 | 2012-03-14 | 北京科技大学 | Method for guiding converter reblowing process operation |
| CN102373310B (en) * | 2011-10-19 | 2013-06-12 | 北京科技大学 | Method for guiding converter reblowing process operation |
| CN102766723B (en) * | 2012-06-29 | 2014-07-16 | 石家庄钢铁有限责任公司 | Limestone slagging steelmaking lance position control method for basic oxygen furnaces |
| CN102766723A (en) * | 2012-06-29 | 2012-11-07 | 石家庄钢铁有限责任公司 | Limestone slagging steelmaking lance position control method for basic oxygen furnaces |
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| CN103233098A (en) * | 2013-05-13 | 2013-08-07 | 涟源市飞达冶金炉料厂 | Novel direct slag-feeding washing mixed material application method in converter tapping process |
| CN103233098B (en) * | 2013-05-13 | 2016-01-20 | 涟源市飞达冶金炉料厂 | A kind of straight upper using method of wash heat mixing material in converter tapping |
| CN103555878A (en) * | 2013-11-25 | 2014-02-05 | 武钢集团昆明钢铁股份有限公司 | Safe and high-efficient low-silicon molten-ion blowing process |
| CN103555878B (en) * | 2013-11-25 | 2015-02-04 | 武钢集团昆明钢铁股份有限公司 | Safe and high-efficient low-silicon molten-ion blowing process |
| CN103993127A (en) * | 2014-05-30 | 2014-08-20 | 河北唐银钢铁有限公司 | Oxygen lance nozzle with concentrated streams |
| CN103993127B (en) * | 2014-05-30 | 2016-03-30 | 河北唐银钢铁有限公司 | A kind of oxygen lance blow head with concentrated a fluid stream |
| CN104711388A (en) * | 2015-02-04 | 2015-06-17 | 北京科技大学 | Low-silicon molten iron blowing method |
| CN104711388B (en) * | 2015-02-04 | 2016-09-07 | 北京科技大学 | A kind of hot metal containing low silicon converting method |
| CN107849624B (en) * | 2016-01-15 | 2019-07-23 | 日本制铁株式会社 | Bessemerize method |
| CN107849624A (en) * | 2016-01-15 | 2018-03-27 | 新日铁住金株式会社 | Bessemerize method |
| CN108384916A (en) * | 2018-04-19 | 2018-08-10 | 天津钢铁集团有限公司 | A kind of control method improving steelmaking converter blowing end point carbon |
| CN108384916B (en) * | 2018-04-19 | 2020-04-28 | 天津钢铁集团有限公司 | Method for improving control capability of steelmaking converter blowing end point carbon |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN108977611A (en) * | 2018-08-31 | 2018-12-11 | 武钢集团昆明钢铁股份有限公司 | A kind of converter hot metal containing low silicon converting method using cast steel recrement |
| CN109097522A (en) * | 2018-09-30 | 2018-12-28 | 武钢集团昆明钢铁股份有限公司 | A kind of middle high manganese high phosphorus hot metal containing low silicon improves the converter smelting method of the residual manganese of endpoint molten steel |
| CN109161634A (en) * | 2018-09-30 | 2019-01-08 | 武钢集团昆明钢铁股份有限公司 | The low silicon high phosphorus hot metal of manganese proposes the preparation method that carbon protects manganese in a kind of converter smelting |
| CN109097522B (en) * | 2018-09-30 | 2020-04-10 | 武钢集团昆明钢铁股份有限公司 | Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point |
| CN109468426B (en) * | 2018-11-30 | 2020-10-16 | 钢铁研究总院 | Method for desulfurizing and desiliconizing molten iron tank and smelting low-phosphorus and sulfur steel with less slag of converter |
| CN109468426A (en) * | 2018-11-30 | 2019-03-15 | 钢铁研究总院 | The method of hot-metal bottle desulfurization desiliconization and the low-phosphorous sulphur steel of converter less-slag melting |
| CN112126738A (en) * | 2019-06-24 | 2020-12-25 | 上海梅山钢铁股份有限公司 | Blowing method of low-temperature low-silicon molten iron of converter |
| CN111455123A (en) * | 2020-06-04 | 2020-07-28 | 北京首钢股份有限公司 | Novel titanium removing agent, preparation method thereof and titanium removing method adopting novel titanium removing agent |
| CN111455123B (en) * | 2020-06-04 | 2021-12-07 | 北京首钢股份有限公司 | Low-cost titanium removing agent, preparation method thereof and titanium removing method adopting titanium removing agent |
| CN112251559A (en) * | 2020-09-10 | 2021-01-22 | 南京钢铁股份有限公司 | Converter low-calorific-value molten iron steelmaking method capable of supplying oxygen accurately |
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| CN115261546A (en) * | 2021-04-30 | 2022-11-01 | 宝山钢铁股份有限公司 | Method, system, apparatus and medium for determining the most economical scrap ratio in converter steelmaking |
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| CN115011752A (en) * | 2022-05-24 | 2022-09-06 | 石家庄钢铁有限责任公司 | Method for controlling slag alkalinity by adopting limestone for steelmaking of converter |
| CN115011752B (en) * | 2022-05-24 | 2023-06-23 | 石家庄钢铁有限责任公司 | Method for controlling slag alkalinity by adopting limestone steelmaking in converter |
| CN115261550A (en) * | 2022-07-12 | 2022-11-01 | 山东钢铁股份有限公司 | Converter smelting method of low-silicon molten iron |
| CN115261550B (en) * | 2022-07-12 | 2024-03-29 | 山东钢铁股份有限公司 | Converter smelting method of low-silicon molten iron |
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