CN104480246B - A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making - Google Patents
A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making Download PDFInfo
- Publication number
- CN104480246B CN104480246B CN201410720970.9A CN201410720970A CN104480246B CN 104480246 B CN104480246 B CN 104480246B CN 201410720970 A CN201410720970 A CN 201410720970A CN 104480246 B CN104480246 B CN 104480246B
- Authority
- CN
- China
- Prior art keywords
- slag
- dephosphorization
- rifle
- nitrogen
- foamed
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses the control slag method of dephosphorization foamed slag in a kind of converter double slag process steel-making, comprise the following steps: if when dephosphorization phase slag does not overflow or overflows fire door on a small quantity, when finishing, carries rapidly the dephosphorization phase rifle, top rifle is carried to fire door switching gas, lower rifle 1～7mm/ ton steel carries out nitrogen flushing cooled slag, the nitrogen control slag time instructs formula t=45m-40P to carry out according to experience, and in formula, t is the nitrogen control slag time, s; M is total addition of lime stone, lime, dolomite and magnesium ball, t; P is nitrogen pressure, MPa. If dephosphorization phase slag overflows fire door in a large number, complete frontly first proceed as follows of dephosphorization phase: if a. finds not in time that to slag foamed 0～30s before dephosphorization phase finishing blowing adds 2～5kg/ ton steel pressure agent; If b. slag foamed is found in time, in 30～60s, to add lime 2～5kg/ ton steel or iron oxide ball 2～5kg/ ton steel before dephosphorization phase finishing blowing; The present invention carries out cooling processing by top rifle nitrogen blowing or (adding cold burden+nitrogen blowing) to dephosphorization foamed slag for converter double slag process smelting process, ensures dephosphorized slag deslagging rate.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, particularly dephosphorization bubble in a kind of converter double slag process steel-makingThe control slag method of foam slag.
Background technology
Converter has good melting bath stirring effect, for high efficiency dephosphorating decarburization provides guarantee. Along with marketProduct quality is required to the increase of raising and smelting cost and environmental protection pressure, double slag process steel-making becomes and turns graduallyOne of important smelting process of stove. In double slag process smelting process, the height of dephosphorization phase high efficiency dephosphorating and high phosphorus slag fallsSlag rate is the key factor that ensures double slag process direct motion. How to utilize converter mill existing equipment and material,It is key problem in technology point that the efficient low-consume of optimizing is realized dephosphorized slag deslagging.
Chinese patent (application number CN103805732A) converter smelting is pressed slag method, proposition elevated pressure nitrogenGas purges foamed slag, but not to critical process operating parameter is described, without operability andRepeatable.
When domestic steel mill adopts double slag process steel-making (optimization [J] of 150t remained converter slag+bis-slag melting technology.Liu Gang science and technology, 2014,4:5-7), adopted nitrogen blowing to press the technology of slag, but do not provided operationFlow process, does not provide feasible Operating Guideline scheme to different vessel slag conditions yet.
Summary of the invention
Technical problem to be solved by this invention is to solve dephosphorization foamed slag in the steel-making of converter double slag process and baffleA difficult problem for slag, the converter double slag process steel-making of the deslagging rate of dephosphorization foamed slag while steel-making for improving converter double slag processThe control slag method of middle dephosphorization foamed slag.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: a kind of converter double slag process refiningThe control slag method of dephosphorization foamed slag in steel, comprises the following steps:
(1) if when dephosphorization phase slag does not overflow or overflows fire door on a small quantity, when finishing, carries rapidly the dephosphorization phase rifle,Top rifle is carried to fire door switching gas, and lower rifle 1～7mm/ ton steel carries out nitrogen flushing cooled slag, nitrogen control slagTime instructs formula t=45m-40P to carry out according to experience, and in formula, t is the nitrogen control slag time, s; M is stoneTotal addition of lime stone, lime, dolomite and magnesium ball, t; P is nitrogen pressure, MPa;
(2) if dephosphorization phase slag overflows fire door in a large number, complete frontly first proceed as follows of dephosphorization phase:
If a. slag foamed is found not in time, 0～30s before dephosphorization phase finishing blowing, add 2～5kg/ ton steel pressure agent, then carry out following step (3);
If b. slag foamed is found in time, in 30～60s, to add before dephosphorization phase finishing blowingLime 2～5kg/ ton steel or iron oxide ball 2～5kg/ ton steel, then carry out following step (3);
(3) when the dephosphorization phase finishes, carry rapidly rifle, top rifle is carried to fire door switching gas, lower rifle 1～7mm/Ton steel carries out nitrogen flushing cooled slag, and the nitrogen flushing control slag time is according to slag condition after reinforced, in step (1) experienceInstruct on time basis and float and be no more than 200%.
Nitrogen pressure is 0.75～1.0MPa, the body of heater deslagging of leaning forward when carrying rifle after nitrogen flushing finishes.
The invention has the beneficial effects as follows: utilize the method for nitrogen blowing or (adding cold burden+nitrogen blowing) to destroy highTemperature foamed slag structure, carries out cooling press slag to dephosphorization foamed slag. The basic control slag technique of dephosphorization foamed slag is:" the dephosphorization phase is complete-and m-lower rifle blows slag while putting forward the lower rifle scope of rifle-stop rifle-switching gas-determine-determine control slag ",In the time of the serious foamed of dephosphorized slag, adopt the method for (adding cold burden+nitrogen blowing) to control slag.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is described in further detail:
The operation principle of converter double slag process steel-making of the present invention is identical with prior art, can be with reference to existingHave technology, so no longer narration, the difference of the present invention and prior art is the control slag side of dephosphorization foamed slagMethod difference, is described in detail below:
The control slag method of dephosphorization foamed slag in converter double slag process steel-making of the present invention, comprises the following steps:
(1) if when dephosphorization phase slag does not overflow or overflows fire door on a small quantity, when finishing, carries rapidly the dephosphorization phase rifle,Top rifle is carried to fire door switching gas, and lower rifle 1～7mm/ ton steel carries out nitrogen flushing cooled slag, nitrogen control slagTime instructs formula t=45m-40P to carry out according to experience, and in formula, t is the nitrogen control slag time, s; M is stoneTotal addition of lime stone, lime, dolomite and magnesium ball, t; P is nitrogen pressure, MPa;
(2) if dephosphorization phase slag overflows fire door in a large number, complete frontly first proceed as follows of dephosphorization phase:
If a. slag foamed is found not in time, 0～30s before dephosphorization phase finishing blowing, add 2～5kg/ ton steel pressure agent, then carry out following step (3);
If b. slag foamed is found in time, in 30～60s, to add before dephosphorization phase finishing blowingLime 2～5kg/ ton steel or iron oxide ball 2～5kg/ ton steel, then carry out following step (3);
(3) when the dephosphorization phase finishes, carry rapidly rifle, top rifle is carried to fire door switching gas, lower rifle 1～7mm/Ton steel carries out nitrogen flushing cooled slag, and the nitrogen flushing control slag time is according to slag condition after reinforced, in step (1) experienceInstruct on time basis and float and be no more than 200%.
Nitrogen pressure is 0.75～1.0MPa, the body of heater deslagging of leaning forward when carrying rifle after nitrogen flushing finishes.
Embodiment 1:
Stay slag melting at the upper pair slags that adopt of 120t top and bottom combined blown converter (heat size is than 2.0), molten iron mainly becomesBe divided into: C:4.10～4.50%, Si:0.36～0.47%, P:0.14～0.18%. The slag making of dephosphorization phaseAuxiliary material and temperature control cold burden addition are: lime stone 10～12kg/ ton steel, and lime 8.5～10kg/ ton steel,Dolomite 10～13kg/ ton steel, magnesium ball 0～5kg/ ton steel, iron sheet ball 12.5～18.5kg/ ton steel. OxygenRifle is 4 hole oxygen rifles, throat diameter 39.3mm, 12 ° of aditus laryngis angles, Mach number 2.02. Converting processIn when the dephosphorization phase is complete be decarburizing reaction while just having started a small amount of foamed slag overflow fire door, carry rapidly rifle, work as oxygenGun sprayer stops oxygen blast immediately while proposing to fire door, switching oxygen is nitrogen, uses nitrogen pressure to stabilize to0.75MPa, lower rifle 600mm is controlled slag 150s to foamed slag continuously, after control slag, carries rifle, grateDeslagging.
In the time of dephosphorized slag foamed especially severe situation, actual treatment situation is as follows:
Embodiment 2:
Stay slag melting at the upper pair slags that adopt of 110t top and bottom combined blown converter (heat size is than 1.9), molten iron mainly becomesBe divided into: C:4.30～4.80%, Si:0.42～0.55%, P:0.10～0.11%. The slag making of dephosphorization phaseAuxiliary material and temperature control cold burden addition are: lime stone 9～11kg/ ton steel, lime 9～10kg/ ton steel, white cloudsStone 8～12kg/ ton steel, magnesium ball 0～5kg/ ton steel, iron sheet ball 14.5～20kg/ ton steel. Oxygen rifle is 4Hole oxygen rifle, throat diameter 38.1mm, 12 ° of aditus laryngis angles, Mach number 2.0. In converting process, work as dephosphorizationPhase is complete be decarburizing reaction while just having started foamed slag do not overflow fire door, carry rapidly rifle, when oxygen gun sprayer carry toWhen fire door, stop immediately oxygen blast, switching oxygen is nitrogen, uses nitrogen pressure to stabilize to 0.80MPa, underRifle 500mm is controlled slag 130s to foamed slag continuously, after control slag, carries rifle to top, grate deslagging.
In the time of dephosphorized slag foamed especially severe situation, actual treatment situation is as follows:
Embodiment 3:
Stay slag melting, molten iron principal component at the upper pair slags that adopt of 50t top and bottom combined blown converter (heat size is than 1.72)For: C:4.20～4.80%, Si:0.39～0.60%, P:0.09～0.10%. The slag making of dephosphorization phase is auxiliaryMaterial and the general addition of temperature control cold burden are: lime stone 16～22kg/ ton steel, and lime 0～10kg/ ton steel,Dolomite 6～12kg/ ton steel, magnesium ball 0～4kg/ ton steel, iron sheet ball 16～30kg/ ton steel. Oxygen rifle is 4Hole oxygen rifle, throat diameter 25.3mm, 11 ° of aditus laryngis angles, Mach number 1.97. In converting process, work as de-The phosphorus phase is complete be decarburizing reaction while just having started a small amount of foamed slag overflow fire door, carry rapidly rifle, work as oxygen gun sprayerWhile proposing to fire door, stop immediately oxygen blast, switching oxygen is nitrogen, uses nitrogen pressure to stabilize to 0.95MPa,Lower rifle 200mm is controlled slag 30s to foamed slag continuously, after control slag, carries rifle to top, grate deslagging.
Because heat size is smaller, slag foamed is easily overflowed fire door, and this has with the slag condition judgement of large heat size ratioDifference. In the time of dephosphorized slag foamed especially severe situation, actual treatment situation is as follows:
Above-described embodiment is only for illustrating technological thought of the present invention and feature, and its object is to makeThose skilled in the art can understand content of the present invention and implement according to this, can not be only with the present embodimentLimit the scope of the claims of the present invention, equal variation or modification that all disclosed spirit is done,Still drop in the scope of the claims of the present invention.
Claims (2)
1. a control slag method for dephosphorization foamed slag in the steel-making of converter double slag process, is characterized in that, comprisesFollowing steps:
(1) if when dephosphorization phase slag does not overflow or overflows fire door on a small quantity, when finishing, carries rapidly the dephosphorization phase rifle,Top rifle is carried to fire door switching gas, and lower rifle 1～7mm/ ton steel carries out nitrogen flushing cooled slag, nitrogen control slagTime instructs formula t=45m-40P to carry out according to experience, and in formula, t is the nitrogen control slag time, s; M is stoneTotal addition of lime stone, lime, dolomite and magnesium ball, t; P is nitrogen pressure, MPa;
(2) if dephosphorization phase slag overflows fire door in a large number, complete frontly first proceed as follows of dephosphorization phase:
If a. slag foamed is found not in time, 0～30s before dephosphorization phase finishing blowing, add 2～5kg/ ton steel pressure agent, then carry out following operation c;
If b. slag foamed is found in time, in 30～60s, to add before dephosphorization phase finishing blowingLime 2～5kg/ ton steel or iron oxide ball 2～5kg/ ton steel, then carry out following operation c;
C. when the dephosphorization phase finishes, carry rapidly rifle, top rifle is carried to fire door switching gas, lower rifle 1～7mm/ tonSteel carries out nitrogen flushing cooled slag, and the reinforced rear slag condition of nitrogen flushing control slag time basis, refers in step (1) experienceLead on time basis and float and be no more than 200%.
2. the control slag method of dephosphorization foamed slag in converter double slag process steel-making according to claim 1, itsBe characterised in that, nitrogen pressure is 0.75～1.0MPa, the body of heater deslagging of leaning forward when carrying rifle after nitrogen flushing finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720970.9A CN104480246B (en) | 2014-12-02 | 2014-12-02 | A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410720970.9A CN104480246B (en) | 2014-12-02 | 2014-12-02 | A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104480246A CN104480246A (en) | 2015-04-01 |
| CN104480246B true CN104480246B (en) | 2016-05-25 |
Family
ID=52754848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410720970.9A Active CN104480246B (en) | 2014-12-02 | 2014-12-02 | A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104480246B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148686B (en) * | 2015-04-19 | 2020-05-05 | 王虎 | Carbon-containing slag-inhibiting cold-bonded pellet and utilization method thereof |
| CN104928432A (en) * | 2015-06-11 | 2015-09-23 | 江苏永钢集团有限公司 | Method for removing phosphorus in converter through blowing nitrogen |
| CN107794331A (en) * | 2016-09-06 | 2018-03-13 | 鞍钢股份有限公司 | A kind of smelting process for reducing converter flux unit consumption |
| CN106636531B (en) * | 2016-11-16 | 2018-06-19 | 南京钢铁股份有限公司 | A kind of combined blown converter smelts double slag techniques of ultralow phosphorus mild steel |
| CN111440918A (en) * | 2020-04-07 | 2020-07-24 | 包头钢铁（集团）有限责任公司 | Method for defoaming dephosphorization residues by utilizing recycled resources |
| CN111944945A (en) * | 2020-07-31 | 2020-11-17 | 邯郸钢铁集团有限责任公司 | Direct tapping method for converter without turning up converter |
| CN113278760A (en) * | 2021-04-12 | 2021-08-20 | 包头钢铁（集团）有限责任公司 | Method for defoaming converter double-slag smelting steel slag |
| CN115044741B (en) * | 2022-06-16 | 2023-11-17 | 宝武集团鄂城钢铁有限公司 | Dephosphorization method for low-phosphorus steel double slag in low-silicon high-phosphorus molten iron smelting |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993980A (en) * | 2010-11-26 | 2011-03-30 | 首钢总公司 | Method for smelting ultralow-phosphorous steel |
| CN103805732A (en) * | 2012-11-07 | 2014-05-21 | 西林钢铁集团有限公司 | Converter smelting slag pressing method |
| CN103883919A (en) * | 2014-03-04 | 2014-06-25 | 秦利明 | Full-automatic LED colored lamp manufacturing machine |
-
2014
- 2014-12-02 CN CN201410720970.9A patent/CN104480246B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993980A (en) * | 2010-11-26 | 2011-03-30 | 首钢总公司 | Method for smelting ultralow-phosphorous steel |
| CN103805732A (en) * | 2012-11-07 | 2014-05-21 | 西林钢铁集团有限公司 | Converter smelting slag pressing method |
| CN103883919A (en) * | 2014-03-04 | 2014-06-25 | 秦利明 | Full-automatic LED colored lamp manufacturing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104480246A (en) | 2015-04-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104480246B (en) | A kind of control slag method of dephosphorization foamed slag in converter double slag process steel-making | |
| CN100507022C (en) | Method for AOD whole melted iron directly smelting austenitic stainless steel | |
| CN103194565B (en) | Method for synchronously dephosphorization and vanadium extraction of vanadium-containing molten iron | |
| CN102660658B (en) | Method for curing converter slag | |
| CN102080136B (en) | Converter smelting technique | |
| CN102424886B (en) | Furnace protection process for decarburization converter less slag splashing | |
| CN104131210B (en) | The production method of ultralow phosphorus IF steel | |
| CN108251592A (en) | A kind of converter smelting method of extremely low phosphoretic steel | |
| CN104232830B (en) | The method of converter low temperature smelting ultra-low phosphoretic steel | |
| CN105525055A (en) | Method for controlling splashing in less slag smelting decarbonization period of converter | |
| CN104561433B (en) | A kind of converter smelting method of medium high carbon ultra-low phosphoretic steel water | |
| CN105112599B (en) | A kind of ultra-low phosphoretic steel smelting process | |
| CN108265150B (en) | A kind of converter high-strength complex blows full raw material slagging method of double slag technique dephosphorization phases | |
| CN104928439A (en) | Method for improving dephosphorization efficiency in duplex converter by using CO2 | |
| CN103205536B (en) | semi-steel dephosphorizing agent and semi-steel dephosphorizing method | |
| CN103397133A (en) | Method for protecting converter with vanadium slag | |
| CN108950127A (en) | A kind of smelting process of Low-phosphorus Steel | |
| CN104451023B (en) | A kind of smelting process continuing to employ converter warm sludge | |
| CN105132611A (en) | Method for producing ultra-low phosphorous steel through single slag of converter | |
| CN103160637A (en) | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter | |
| CN102851449B (en) | Refining furnace molten steel dephosphorization method adopting component adjustment and hermetical blowing of argon gas and oxygen gas | |
| CN104531940A (en) | Converter final slag thickening method | |
| CN100522417C (en) | Converter process of producing continuously cast circular steel billet for high pressure boiler pipe | |
| CN103966388B (en) | A kind of method shortening the semisteel converter steelmaking of pure oxygen blow duration | |
| CN107058679A (en) | A kind of method for stablizing half steel quality |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Slag control method of dephosphorization foaming slag in converter double-slag-process steel making Effective date of registration: 20170724 Granted publication date: 20160525 Pledgee: CIGNA Tianjin Financial Leasing Co. Pledgor: Tianjin Iron&Steel Group Co., Ltd. Registration number: 2017120000030 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20180706 Granted publication date: 20160525 Pledgee: CIGNA Tianjin Financial Leasing Co. Pledgor: Tianjin Iron&Steel Group Co., Ltd. Registration number: 2017120000030 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right |