CN104404195B - A kind of " duplex stays slag method " smelts the method for high phosphorus hot metal - Google Patents
A kind of " duplex stays slag method " smelts the method for high phosphorus hot metal Download PDFInfo
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- CN104404195B CN104404195B CN201410820107.0A CN201410820107A CN104404195B CN 104404195 B CN104404195 B CN 104404195B CN 201410820107 A CN201410820107 A CN 201410820107A CN 104404195 B CN104404195 B CN 104404195B
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Abstract
The invention discloses the method that one " duplex stays slag method " smelts high phosphorus hot metal, said method comprising the steps of: 1) smelting of converter 1 dephosphorization；2) dephosphorization is smelted the half steel that obtains and is blended into converter 2 and carries out decarburization smelting；3) converter 2 decarburization is smelted and is obtained qualified molten steel；4) slag after decarburization is smelted carries out staying slag after spattering dry-cure, carries out next stove dephosphorization and smelts, repeat step 1 after staying slag) 3) complete the smelting of next stove high phosphorus hot metal.The present invention can be effectively ensured dephosphorization stove dephosphorization effect, makes dephosphorization stove half steel end phosphorus content stable below 0.040%.
Description
Technical field
The invention belongs to pneumatic steelmaking field, particularly relate to the method that one " duplex stays slag method " smelts high phosphorus hot metal.
Background technology
Along with the continued downturn of steel market, cost efficiency has become instantly and iron and steel enterprise's daily management mission from now on
In need the problem of solution badly.Iron ore, as the important component part in cost structure, occupies larger proportion in cost structure,
Therefore, the problem that the high-phosphorus iron ore using price relatively low has become present stage iron and steel enterprise's overriding concern.It addition, along with iron mine provides
Source day by day deficient, the Utilizing question of low-grade, high content of phosphorus iron ore deposit also by become iron and steel enterprise must faced by problem.
Use gradually stepping up of ratio, steel-making to smelt the ratio of high phosphorus hot metal along with high-phosphorus iron ore also will improve therewith.
If taking original smelting process, ensureing on the basis of terminal component requirements, produce the most accordingly splash, increase slag charge consumption,
The relevant issues such as terminal point control is poor, recovery rate of iron is low, lining wear aggravation.It is therefore necessary to take a kind of applicable production work
Skill, solves the relevant issues produced when original technique smelts high phosphorus hot metal.
Summary of the invention
It is an object of the invention to, it is provided that a kind of " duplex stays slag method " smelts the method for high phosphorus hot metal, and the method can have
Effect ensures dephosphorization stove dephosphorization effect, makes dephosphorization stove half steel end phosphorus content stable below 0.040%.
For reaching above-mentioned purpose, present invention employs following technical scheme:
A kind of " duplex stays slag method " smelts the method for high phosphorus hot metal, said method comprising the steps of:
1) converter 1 dephosphorization is smelted: the 100% of decarburization metallurgical slag stays slag and high phosphorus hot metal to carry out dephosphorization smelting；Smelting process
In, first slag charge of dephosphorization uses Calx, sintering deposit and bauxite, and lime adding amount is 15～20kg/t, sintering deposit addition
Smelting sintering deposit for dephosphorization and add 1/2nd of total amount, red bauxite is 400-600kg；Early stage rifle position is 1.70～1.80m, mistake
Journey rifle position is 1.10～1.30m, and process oxygen pressure is 0.50～0.60MPa, and bottom blowing pattern is maximum stream flow pattern；After process plays slag
Adding two batches of limestone, every batch of limestone amount is 400-500kg；After dephosphorization smelting endpoint carries rifle, bottom blowing is stirred by force 1.5-2.5 minute；
High phosphorus slag after dephosphorization is smelted all is outwelled；
2) dephosphorization is smelted the half steel that obtains and is blended into converter 2 and carries out decarburization smelting；
3) converter 2 decarburization is smelted: first slag charge of decarburization uses red bauxite, carbon magnesium ball, Calx and sintering deposit, and Calx adds
Amount is 10～15kg/t, and sintering deposit addition is that 1/2nd of sintering deposit addition total amount are smelted in decarburization, and red bauxite addition is
300-400kg, carbon magnesium ball addition is 600-700kg；Process rifle position is 2.0-2.2m；Process oxygen pressure is 0.60～0.70MPa；
Decarburization obtains qualified molten steel after smelting；
4) slag after decarburization is smelted carries out staying slag after spattering dry-cure, carries out next stove dephosphorization and smelts, repeat step after staying slag
Rapid 1) smelting of another stove high phosphorus hot metal-3) is completed.
Preferably, described step 1) in, process oxygen pressure is 0.55MPa, and process oxygen flow is 14500Nm3/ h, process oxygen
Gas total burn-off is 3000～3200Nm3。
Preferably, described step 1) in, bottom blowing pattern is switched to maximum stream flow pattern, and concrete flow is 1800Nm3/h。
Preferably, described step 1) in, bottom blowing strong wake turbulence amount is 1800Nm3/h。
Preferably, described step 2) in, process oxygen pressure is 0.65MPa, and oxygen flow is 23000Nm3/h。
In the present invention, the terminal rifle position general control that dephosphorization is smelted is at 1.2m.
The present invention controls to stay the quantity of slag.Owing to containing a certain amount of FeO composition in converter finishing slag, this finishing slag remains next stove,
When being blended into molten iron, must occur with following formula (1), the reaction of formula (2) simultaneously.When in finishing slag, (FeO) is too high, formula (1), (2)
Reaction fierceness, moment produces the subsidiary slag of substantial amounts of gas, molten iron is gone out, and causes explosive splash accident.
(FeO)+[C]=[Fe]+CO (1)
2 (FeO)+[C]=2 [Fe]+CO2 (2)
Splash to be prevented, the most direct way is to control gas in stove, stops or slow down formula (1), the reaction of formula (2).Cause
This, need slag is changed Slag treatment.Wherein, changing Slag treatment is to judge whether to add the things such as carbon magnesium ball according to slag situation
Material, to reach to be thickened slag, reduces (FeO) content in slag.Additionally, due to total quantity of slag is on the low side when decarburization is smelted, stay the quantity of slag preferred
The 100% of total quantity of slag is smelted for decarburization.
The present invention controls slag charge structure, when dephosphorization is smelted: head is criticized slag charge and used whole Calx, sintering deposit addition to be dephosphorization
Smelt sintering deposit and add 1/2nd of total amount, the slag charge pattern of bauxite 400-600kg；Remaining sintering deposit small lot adds, and 9
Minute all add；Process adds two batches of limestone after playing slag, and every batch of limestone amount is 400-500kg.When decarburization is smelted: head is criticized
Slag charge use whole Calx, the 1/2 of the total addition of decarburization sintering deposit, bauxite 300-400kg, the slag of carbon magnesium ball 600-700kg
Material pattern；Remaining 1/2 small lot of the total addition of decarburization sintering deposit adds, and within 9 minutes, all adds.
Rifle position is controlled by the present invention.When dephosphorization is smelted: early stage rifle position controls 1.70～1.80m, and process rifle position is
1.10～1.30m, terminal rifle position keeps 1.2m；Particularly preferably process rifle position is 1.20m, to ensure that early stage scorification is saturating, and finishing slag
Good, process uniformly heats up.When decarburization is smelted: process rifle position is 2.0-2.2m (preferably 2.1m), terminal rifle position keeps 1.50m,
To ensure that early stage scorification is saturating, finishing slagization is good, and process uniformly heats up, and endpoint molten steel composition is uniform.
Oxygen pressure is controlled by the present invention.When dephosphorization is smelted: early stage oxygen pressure is 0.90MPa, promotes early stage molten iron temperature fast
Speed promotes, and promotes early stage slag, quick dephosphorization；Process oxygen pressure is 0.50～0.60MPa, particularly preferably by voltage-controlled for process oxygen system
For 0.55MPa.When decarburization is smelted: process oxygen pressure is 0.60～0.70MPa, particularly preferably it is made as voltage-controlled for process oxygen
0.65MPa, promotes early stage half steel homogeneous temperature to promote, and promotes early stage slag, it is to avoid process is returned dry.
Bottom blowing gas pattern is optimized by the present invention.Dephosphorization smelts bottom blowing model selection maximum stream flow pattern, at this
Bright middle bottom blowing flow is 1800Nm3/ h, promotes dephosphorization stove quick dephosphorization.After finishing blowing, bottom blowing switches to stir by force pattern, stirs by force
Time is 1.5-2.5 minute (preferably 2 minutes), in order to reduce all iron content in slag, reduces slag bubble level.
The present invention is by improving the process during converter duplex operation and remained converter slag, innovate and melt
Closing, fully take into account the change of the technological parameter impact on other step reaction in each step, combination improves multiple technique
Parameter, to reach to smelt the purpose of high phosphorus hot metal.
The present invention compared with prior art, has the advantages that
1) dephosphorization stove dephosphorization effect is effectively ensured, makes dephosphorization stove half steel end phosphorus content stable below 0.040%；
2) slag charge consumption reduces, and can effectively reduce production cost；
3) molten steel recovery rate is high, can be prevented effectively from because of the generation of splash when single slag process is smelted, it is to avoid because of splash generation
Metal loss, improves molten steel recovery rate.
Accompanying drawing explanation
Fig. 1 smelts the end phosphorus content of high phosphorus hot metal for " duplex stays slag method "；
Fig. 2 smelts the slag charge consumption of high phosphorus hot metal for " duplex stays slag method "；
Fig. 3 is the end phosphorus content that existing technique smelts high phosphorus hot metal；
Fig. 4 is the slag charge consumption that existing technique smelts high phosphorus hot metal.
Detailed description of the invention
With the drawings and specific embodiments, the present invention is further detailed explanation below.
Embodiment 1-20
A kind of " duplex stays slag method " smelts the method for high phosphorus hot metal, said method comprising the steps of:
1) converter 1 dephosphorization is smelted: the 100% of decarburization metallurgical slag stays slag and iron ore to carry out dephosphorization smelting；In smelting process,
First slag charge of dephosphorization uses Calx, sintering deposit and bauxite, and the total addition of Calx is 15～20kg/t, and sintering deposit addition is
Dephosphorization is smelted sintering deposit and is added 1/2nd of total amount, and red bauxite is 400-600kg；Early stage rifle position controls 1.70～1.80m,
Process rifle position is 1.10～1.30m, and terminal rifle position keeps 1.2m, and process oxygen pressure is 0.50～0.60MPa, and process oxygen flow is
14500Nm3/ h, process oxygen total burn-off is 3000～3200Nm3, the flow of bottom blowing pattern is 1800Nm3/h；After process plays slag
Adding two batches of limestone, every batch of limestone amount is 400-500kg；Dephosphorization smelting endpoint carry rifle after bottom blowing stir by force 1 point 30 seconds-2 points
30 seconds, bottom blowing strong wake turbulence amount was 1800Nm3/h；High phosphorus slag after dephosphorization is smelted all is outwelled；
2) dephosphorization is smelted the half steel that obtains and is blended into converter 2 and carries out decarburization smelting；
3) converter 2 decarburization is smelted: first slag charge of decarburization uses red bauxite, carbon magnesium ball, Calx and sintering deposit, and Calx adds
Amount is 10～15kg/t, and red bauxite addition is 300-400kg, and carbon magnesium ball addition is 600-700kg, and sintering deposit addition is
Decarburization is smelted sintering deposit and is added 1/2nd of total amount；Process rifle position is 2.0-2.2m；Process oxygen pressure is 0.60～0.70MPa,
Oxygen flow is 23000Nm3/h；Decarburization obtains qualified molten steel after smelting；
4) slag after decarburization is smelted carries out staying slag after spattering dry-cure, carries out next stove dephosphorization and smelts, repeat step after staying slag
Rapid 1) smelting of another stove high phosphorus hot metal-3) is completed.
In said method, general 12 minutes of oxygen blow duration total time when dephosphorization is smelted, point three phases, 0-3 in 12 minutes
Minute it is early stage, within 3-9 minute, is process；General 11 minutes of oxygen blow duration total time when decarburization is smelted, in 11 minutes point three rank
Section, 0-3 minute is early stage, within 3-9 minute, is process.
According to the method described above, " duplex stays slag method " is taked to smelt high phosphorus hot metal as embodiment 1-in 150 tons of converters
20, the concrete correlation technique used or step parameter are shown in Table 1-table 2.
Table 1 embodiment 1-20 smelting process parameter
Table 2 embodiment 1-20 design parameter
In above-mentioned table 2, molten iron phosphorus content 0.001% is in units of 0.001%, enters stove molten iron in such as embodiment 1
The value of phosphorus content 0.001% is 173, and it is equivalent to into stove molten iron phosphorus content is 0.173%.Other are herewith.
In table 1, the addition of Calx is in units of kg/t, but when reality is smelted, past owing to entering the addition of stove molten iron
Toward more than 1 ton, for tens of tons etc..Lime adding amount the most in table 2 is to smelt the addition total amount of Calx with whole stove to enter
Row calculates.
Embodiment 1-20 end phosphorus content and slag charge consumption are carried out broken line drawing, and result is shown in Fig. 1, Fig. 2, wherein, and stove number
The most corresponding embodiment 1-20 of 1-20.
Comparative example 1-20
According to table 3 and table 4, smelt same high phosphorus hot metal as comparative example 1-20 using existing technique.
The high phosphorus hot metal converting process method of table 3 prior art
Table 4 comparative example design parameter
| Enter stove molten iron phosphorus 0.001% | Lime adding amount (ton) | End phosphorus content 0.001% | |
| Comparative example 1 | 173 | 7.52 | 25 |
| Comparative example 2 | 180 | 7.23 | 22 |
| Comparative example 3 | 168 | 8.12 | 19 |
| Comparative example 4 | 152 | 7.62 | 18 |
| Comparative example 5 | 165 | 7.13 | 23 |
| Comparative example 6 | 192 | 8.31 | 24 |
| Comparative example 7 | 167 | 7.68 | 17 |
| Comparative example 8 | 159 | 7.53 | 26 |
| Comparative example 9 | 162 | 8.05 | 25 |
| Comparative example 10 | 167 | 7.23 | 19 |
| Comparative example 11 | 172 | 6.82 | 20 |
| Comparative example 12 | 168 | 6.81 | 18 |
| Comparative example 13 | 180 | 7.04 | 23 |
| Comparative example 14 | 170 | 6.95 | 20 |
| Comparative example 15 | 165 | 7.23 | 18 |
| Comparative example 16 | 182 | 7.86 | 25 |
| Comparative example 17 | 178 | 7.95 | 24 |
| Comparative example 18 | 165 | 7.52 | 18 |
| Comparative example 19 | 159 | 7.32 | 17 |
| Comparative example 20 | 175 | 7.85 | 21 |
Drawing comparative example 1-20 end phosphorus content and slag charge consumption, result is shown in Fig. 3, Fig. 4, wherein, and stove number 1-20
Comparative example 1-20 respectively.
As shown in Figure 1, after using the method for the present invention, dephosphorization stove half steel end phosphorus content is stable below 0.040%, de-
After carbon, end phosphorus content is below 0.014%, minimum reaches 0.009%.And from figure 3, it can be seen that use prior art, terminal
Phosphorus content is more than 0.017%, hence it is evident that higher than the application.From Fig. 2 and Fig. 4, smelt same high phosphorus hot metal, the application's
Method consume slag charge substantially between 4.03-4.85 ton, prior art consume slag charge then at 7.04-8.31 ton, this Shen
The slag charge that please consume is significantly lower than prior art.It follows that " duplex stays slag method " that use the present invention to provide smelts high phosphorus
Molten iron can substantially reduce end phosphorus content and slag charge consumption.
The invention is not restricted to above-described embodiment, without departing from the present invention, can carry out various deformation and
Amendment.
If there being the content not kept detailed accounts in this specification, being the state of the art, here is omitted.
Claims (7)
1. the method that " duplex stays slag method " smelts high phosphorus hot metal, said method comprising the steps of:
1) converter 1 dephosphorization is smelted: the 100% of decarburization metallurgical slag stays slag and high phosphorus hot metal to carry out dephosphorization smelting；In smelting process, de-
First slag charge of phosphorus uses Calx, sintering deposit and bauxite, and lime adding amount is 15～20kg/t, and sintering deposit addition is dephosphorization
Smelting sintering deposit and add 1/2nd of total amount, red bauxite is 400-600kg；Early stage rifle position is 1.70～1.80m, process rifle position
Being 1.10～1.30m, process oxygen pressure is 0.50～0.60MPa, and bottom blowing pattern is maximum stream flow pattern；Process adds two after playing slag
Criticizing limestone, every batch of limestone addition is 400-500kg；After dephosphorization smelting endpoint carries rifle, bottom blowing is stirred by force 1.5-2.5 minute；De-
High phosphorus slag after phosphorus is smelted all is outwelled；
2) dephosphorization is smelted the half steel that obtains and is blended into converter 2 and carries out decarburization smelting；
3) converter 2 decarburization is smelted: first slag charge of decarburization uses red bauxite, carbon magnesium ball, Calx and sintering deposit, and lime adding amount is
10～15kg/t, sintering deposit addition is that 1/2nd of sintering deposit addition total amount are smelted in decarburization, and red bauxite addition is 300-
400kg, carbon magnesium ball addition is 600-700kg；Process rifle position is 2.0-2.2m；Process oxygen pressure is 0.60～0.70MPa；Decarburization
Qualified molten steel is obtained after smelting；
4) slag after decarburization is smelted carries out staying slag after spattering dry-cure, carries out next stove dephosphorization and smelts, repeat step 1 after staying slag)-
3) smelting of next stove high phosphorus hot metal is completed.
Method the most according to claim 1, it is characterised in that described step 1) in, process oxygen pressure is 0.55MPa, process
Oxygen flow is 14500Nm3/ h, process oxygen total burn-off is 3000～3200Nm3。
Method the most according to claim 1, it is characterised in that described step 1) in, bottom blowing pattern is switched to maximum stream flow
Pattern, concrete flow is 1800Nm3/h。
Method the most according to claim 1, it is characterised in that described step 1) in, the bottom blowing time of stirring by force is 2 minutes, the end
Blowing strong wake turbulence amount is 1800Nm3/h。
Method the most according to claim 1, it is characterised in that described step 1) in, dephosphorization smelting process rifle position and terminal
Rifle position is 1.2m.
Method the most according to claim 1, it is characterised in that described step 2) in, decarburization smelting process rifle position is 2.1m,
Terminal rifle position keeps 1.50m.
Method the most according to claim 1, it is characterised in that described step 2) in, process oxygen pressure is 0.65MPa, oxygen
Flow is 23000Nm3/h。
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| CN107164606A (en) * | 2017-03-27 | 2017-09-15 | 首钢京唐钢铁联合有限责任公司 | Semisteel dephosphorization smelting method |
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| CN102776314B (en) * | 2012-07-24 | 2014-06-25 | 钢铁研究总院 | Smelting method of ultra-low phosphorus steel |
| CN103773919B (en) * | 2014-02-18 | 2015-04-29 | 钢铁研究总院 | Method for smelting middle-high phosphorus molten iron in converter |
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Effective date of registration: 20210719 Address after: 271104 Shuangquan Road, Gangcheng District, Jinan City, Shandong Province Patentee after: LAIGANG GROUP YINSHAN SHAPED STEEL Co.,Ltd. Address before: 271104 No.99, Fuqian street, Gangcheng District, Laiwu City, Shandong Province Patentee before: SHANDONG IRON AND STEEL Co.,Ltd. |
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