CN103602776A - Slag conditioning method for converter slag-splashing converter-protection technology - Google Patents
Slag conditioning method for converter slag-splashing converter-protection technology Download PDFInfo
- Publication number
- CN103602776A CN103602776A CN201310628506.2A CN201310628506A CN103602776A CN 103602776 A CN103602776 A CN 103602776A CN 201310628506 A CN201310628506 A CN 201310628506A CN 103602776 A CN103602776 A CN 103602776A
- Authority
- CN
- China
- Prior art keywords
- slag
- converter
- splashing
- coke
- residue adjustment
- 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.)
- Granted
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
A disclosed slag conditioning method for converter slag-splashing converter-protection technology comprises the following steps: 1) keeping all or part of slag left after converter tapping is finished; and 2) pouring 5-10 Kg of raw dolomite and 15-20 Kg of coke into per ton of the slag, mixing uniformly for slag conditioning. According to the slag conditioning method, aiming at a melting process during which the converter final slag has high oxidizability, coke and raw dolomite are added into slag, so that MgO in the slag is easy to saturate, and thus the service life of converter lining is prolonged; additionally, because the main component of raw dolomite is MgCO3, MgO generated by decomposition of the raw dolomite helps to improve the viscosity of the slag, and a slag splashing layer is easy to form; also the decomposition reaction is an endothermic reaction, so that the slag temperature is reduced; and more importantly, CO2 gas generated by the decomposition reaction helps to violently stir a molten pool and accelerate the reaction of coke and slag, so that the method provided by the invention helps to shorten the slag splashing time, improve the service life of the converter, reduce iron loss and further improve molten steel yielding rate.
Description
Technical field
The present invention relates to metallurgical technology, refer to particularly a kind of residue adjustment method for splashing slag in converter technique.
Background technology
Furnace life is an integrated technology economic target of converter steelmaking, improves furnace life and not only can reduce refractory consumption rate, improves operating rate, reduces production costs, and be conducive to promote the benign cycle of production.Converter lining is operated under high temperature, hyperoxia voltinism condition, conventionally the speed with 0.2～0.8mm/ stove is etched, for guaranteeing that converter is normal, produce and raising lining life, China metallargist has done much work, wherein, slag splashing is a new technology that improves furnace life of developing in recent years, in large quantities of iron and steel enterprises produce, has obtained positive effect, and Technology of Slag Splashingfor Furnace Maintenance has wide popularizing application prospect in China.
The ultimate principle of splashing slag in converter is after converter tapping; in stove, leave the finishing slag of smelting; then use high pressure nitrogen to nitrogen blowing in slag; slag is splash and be attached on furnace lining; slag blanket is spattered in formation; alleviate steelmaking process to the mechanical erosion of furnace lining and chemical erosion, thereby reach the object of protecting furnace lining, improving furnace life.In splashing slag in converter technique, steel is gone out to stay to the greatest extent after all or part of slag, need to observe the rare thick and temperature height of slag, determine whether to add again slag supplying agent, wherein, when converter finishing slag, cross when rare, there will be that to spatter the slag time long and spatter the problem of slag difficulty, the residue adjustment mode of existing splashing slag in converter technique mainly contains two kinds: one, in slag with addition of magnesium ball (main component of magnesium ball is Mg) and coke; Its two, add light dolomite (main component MgO) and coke, but there is following shortcoming in existing residue adjustment mode: 1) spatter slag overlong time; 2) iron loss is larger; 1) price of magnesium ball and light dolomite is higher, is unfavorable for cost control.
Summary of the invention
Object of the present invention is just to provide a kind of residue adjustment method for splashing slag in converter technique, and this residue adjustment method has shortened spatters the slag time, has reduced iron loss, has improved furnace life.
For achieving the above object, the technical solution used in the present invention is: a kind of residue adjustment method for splashing slag in converter technique, comprises the following steps:
1), after converter tapping completes, leave all or part of slag;
2) in slag, drop into the unprocessed dolomite of 5～10kg/t slag and the coke of 15～20kg/t slag, mix and carry out residue adjustment.
Further, in described step 1), in slag, the weight percentage of FeO is 18～30%.
Further, described step 2) in, the granularity of described unprocessed dolomite is 10～20mm, the granularity of described coke is 5～10mm.
Further, described step 2) in, the dosage of unprocessed dolomite is 8～10kg/t slag, dosage 18～20kg/t slag of coke.
The present invention compared with prior art, has the following advantages:
1) the present invention is directed to the high heat of converter finishing slag oxidisability, in slag, add coke and unprocessed dolomite, first, FeO in coke and finishing slag reaction can reduce finishing slag oxidisability, reduce the saturation value of MgO in slag, MgO in slag is easily reached capacity, and MgO in slag is when reach capacity, the MgO meltage of furnace lining itself will correspondingly reduce, thereby has improved lining life; In addition, the main component because of unprocessed dolomite is MgCO
3, its MgO decompose producing can improve the viscosity of slag, easily form and spatter slag blanket, and this is decomposed into thermo-negative reaction, can reduce slag temperature, the more important thing is the CO that this decomposition reaction produces
2gas vigorous stirring molten bath, promotes C-O reaction, has improved the speed of reaction of FeO in coke and slag that is:, thereby shortened the operating time of whole slag splashing technique, and further reduced the MgO saturation value in slag, and then improved furnace life, reduce iron loss, improved molten steel recovery rate.
2) price of unprocessed dolomite is far below the price of magnesium ball and light dolomite, 1/10 also lower than it, thereby the inventive method has reduced the cost of splashing slag in converter technique.
3) under the same terms, more than the inventive method is spattered the time shorten 20s of slag than light dolomite and coke, more than iron loss reduces 150kg, more than furnace life improves 3000 stoves.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, be convenient to more clearly understand the present invention, but they do not form restriction to the present invention.
Embodiment 1
The converter finishing slag that is 20.1% to FeO content carries out residue adjustment:
1) after converter tapping completes, leave 21t slag, converter is just shaken;
2) the coke 315kg that the unprocessed dolomite 135kg that is 10mm toward the interior input of slag granularity and granularity are 10mm, mixes and carries out residue adjustment.
Before and after residue adjustment, slag composition contrast is as shown in table 1:
Table 1
| ? | CaO% | SiO 2% | MgO% | FeO% |
| Slag specimen before residue adjustment | 46 | 16.47 | 10.4 | 20.1 |
| Slag specimen after residue adjustment | 47.33 | 16.59 | 11.32 | 9.7 |
Slag after utilizing high pressure nitrogen to residue adjustment spatters slag operation, and spattering the slag time only needs 180s.
Embodiment 2
The converter finishing slag that is 18% to FeO content carries out residue adjustment:
1) after converter tapping completes, leave 21t slag, converter is just shaken;
2) the coke 420kg that the unprocessed dolomite 105kg that is 15mm toward the interior input of slag granularity and granularity are 5mm, mixes and carries out residue adjustment.
Before and after residue adjustment, slag composition contrast is as shown in table 2:
Table 2
| ? | CaO% | SiO 2% | MgO% | FeO% |
| Slag specimen before residue adjustment | 46 | 16.47 | 10.4 | 18 |
| Slag specimen after residue adjustment | 46.5 | 16.5 | 11.56 | 9.5 |
Slag after utilizing high pressure nitrogen to residue adjustment spatters slag operation, and spattering the slag time only needs 178s.
Embodiment 3
The converter finishing slag that is 23% to FeO content carries out residue adjustment:
1) after converter tapping completes, leave 21t slag, converter is just shaken;
2) the coke 378kg that the unprocessed dolomite 210kg that is 20mm toward the interior input of slag granularity and granularity are 8mm, mixes and carries out residue adjustment.
Before and after residue adjustment, slag composition contrast is as shown in table 3:
Table 3
| ? | CaO% | SiO 2% | MgO% | FeO% |
| Slag specimen before residue adjustment | 46 | 16.47 | 10.4 | 23 |
| Slag specimen after residue adjustment | 48.5 | 17.01 | 12.78 | 8.9 |
Slag after utilizing high pressure nitrogen to residue adjustment spatters slag operation, and spattering the slag time only needs 170s.
Embodiment 4
The converter finishing slag that is 30% to FeO content carries out residue adjustment:
1) after converter tapping completes, leave 21t slag, converter is just shaken;
2) the coke 420kg that the unprocessed dolomite 210kg that is 10mm toward the interior input of slag granularity and granularity are 5mm, mixes and carries out residue adjustment.
Before and after residue adjustment, slag composition contrast is as shown in table 4:
Table 4
| ? | CaO% | SiO 2% | MgO% | FeO% |
| Slag specimen before residue adjustment | 40 | 15.47 | 10.4 | 30 |
| Slag specimen after residue adjustment | 45.5 | 17 | 13.02 | 9.9 |
Slag after utilizing high pressure nitrogen to residue adjustment spatters slag operation, and spattering the slag time only needs 180s.
The present invention utilizes the decomposition reaction of unprocessed dolomite: MgCO
3→ MgO+CO
2↑ (play and increase MgO, cooling, and add the effect of strong mixing), and the reaction between carbon and oxygen of coke and finishing slag: C+FeO → [Fe]+CO ↑ (playing the effect of falling low FeO content and reducing MgO saturation value) carried out residue adjustment to shoddye, the FeO content of finishing slag is down to below 10%, improved slag viscosity, by the inventive method, spatter after slag, spattering the slag time can be down to below 180s from 200s, and then after making to spatter slag furnace life from more than 10000 stoves, bring up to more than 15000 stoves, improved molten steel recovery rate simultaneously, save the MgO using in traditional technology and spattered slag charge, spattering slag cost reduces greatly.
Claims (4)
1. for a residue adjustment method for splashing slag in converter technique, comprise the following steps:
1), after converter tapping completes, leave all or part of slag;
2) in slag, drop into the unprocessed dolomite of 5～10kg/t slag and the coke of 15～20kg/t slag, mix and carry out residue adjustment.
2. the residue adjustment method for splashing slag in converter technique according to claim 1, is characterized in that: in described step 1), in slag, the weight percentage of FeO is 18～30%.
3. the residue adjustment method for splashing slag in converter technique according to claim 1 and 2, is characterized in that: described step 2), the granularity of described unprocessed dolomite is 10～20mm, and the granularity of described coke is 5～10mm.
4. the residue adjustment method for splashing slag in converter technique according to claim 1 and 2, is characterized in that: described step 2), the dosage of unprocessed dolomite is 8～10kg/t slag dosage 18～20kg/t slag of coke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628506.2A CN103602776B (en) | 2013-11-29 | 2013-11-29 | For the Slag modification method in splashing slag in converter technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628506.2A CN103602776B (en) | 2013-11-29 | 2013-11-29 | For the Slag modification method in splashing slag in converter technique |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103602776A true CN103602776A (en) | 2014-02-26 |
| CN103602776B CN103602776B (en) | 2016-01-13 |
Family
ID=50121039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310628506.2A Active CN103602776B (en) | 2013-11-29 | 2013-11-29 | For the Slag modification method in splashing slag in converter technique |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103602776B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103263A (en) * | 2017-12-05 | 2018-06-01 | 山东钢铁股份有限公司 | A kind of method using unprocessed dolomite fettling |
| CN111206140A (en) * | 2018-11-21 | 2020-05-29 | 新疆八一钢铁股份有限公司 | Raw dolomite fettling process |
| CN111635975A (en) * | 2020-06-09 | 2020-09-08 | 首钢集团有限公司 | Method for recycling converter slag |
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
| CN115341068A (en) * | 2022-08-26 | 2022-11-15 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254018A (en) * | 1998-10-05 | 2000-05-24 | 川崎制铁株式会社 | Converter fire wall slag-splashing furnace-protecting method |
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102787204A (en) * | 2012-08-23 | 2012-11-21 | 武汉钢铁(集团)公司 | Energy-saving environmentally-friendly converter slag splashing protecting charging and production process thereof |
| CN103397136A (en) * | 2013-07-17 | 2013-11-20 | 首钢京唐钢铁联合有限责任公司 | Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition |
-
2013
- 2013-11-29 CN CN201310628506.2A patent/CN103602776B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1254018A (en) * | 1998-10-05 | 2000-05-24 | 川崎制铁株式会社 | Converter fire wall slag-splashing furnace-protecting method |
| CN102660658A (en) * | 2012-05-23 | 2012-09-12 | 河北省首钢迁安钢铁有限责任公司 | Method for curing converter slag |
| CN102787204A (en) * | 2012-08-23 | 2012-11-21 | 武汉钢铁(集团)公司 | Energy-saving environmentally-friendly converter slag splashing protecting charging and production process thereof |
| CN103397136A (en) * | 2013-07-17 | 2013-11-20 | 首钢京唐钢铁联合有限责任公司 | Residue splashing method for stabilizing converter hearth residue thickness under low-residue smelting condition |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108103263A (en) * | 2017-12-05 | 2018-06-01 | 山东钢铁股份有限公司 | A kind of method using unprocessed dolomite fettling |
| CN111206140A (en) * | 2018-11-21 | 2020-05-29 | 新疆八一钢铁股份有限公司 | Raw dolomite fettling process |
| CN111635975A (en) * | 2020-06-09 | 2020-09-08 | 首钢集团有限公司 | Method for recycling converter slag |
| CN111635975B (en) * | 2020-06-09 | 2022-05-17 | 首钢集团有限公司 | Method for recycling converter slag |
| WO2022001874A1 (en) * | 2020-06-29 | 2022-01-06 | 宝山钢铁股份有限公司 | Slag-splashing fettling method |
| CN113930574A (en) * | 2020-06-29 | 2022-01-14 | 宝山钢铁股份有限公司 | Slag splashing fettling method beneficial to furnace bottom maintenance |
| CN113930574B (en) * | 2020-06-29 | 2022-12-16 | 宝山钢铁股份有限公司 | Slag splashing fettling method beneficial to furnace bottom maintenance |
| CN115341068A (en) * | 2022-08-26 | 2022-11-15 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
| CN115341068B (en) * | 2022-08-26 | 2024-01-26 | 湖南华菱涟源钢铁有限公司 | Slag splashing furnace protection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103602776B (en) | 2016-01-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102212640B (en) | Convertor steelmaking method capable of reducing slag quantity | |
| CN100451134C (en) | Double-slag converter process for producing high carbon low-phosphorus molten steel | |
| CN108148942B (en) | A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process | |
| CN102212643B (en) | Converter less-slag smelting process | |
| CN102660658B (en) | Method for curing converter slag | |
| CN103627837B (en) | Iron and the method for phosphorus is reclaimed from copper smelter slag | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN103773919B (en) | Method for smelting middle-high phosphorus molten iron in converter | |
| CN102965463B (en) | Efficient dephosphorization process for converter | |
| CN103602776B (en) | For the Slag modification method in splashing slag in converter technique | |
| CN103060512B (en) | Dephosphorizing and steelmaking method of medium-high-phosphorous semisteel by top-blown converter | |
| CN109321704B (en) | Smelting method for reducing phosphorus content of smelting final slag by slag splashing furnace protection | |
| CN105112595A (en) | Smelting method capable of realizing phosphorus content of less than 70ppm in high-carbon converter tapping | |
| CN107419061A (en) | Bottom-blowing of converter dust improve gasification dephosphorization effect method | |
| CN101126113A (en) | Revolving furnace smelt method for high-carbon low-phosphorus steel | |
| CN102965465A (en) | Method for curing converter slag | |
| CN108754062A (en) | A kind of method of the interior gasification dephosphorization steel-making of converter steel slag hearth | |
| CN103160637A (en) | Low-phosphorous steel smelting method of mixed blowing of oxygen and nitrogen of top blowing oxygen lance of converter | |
| CN108085449B (en) | The method of the double slag production ultra-low phosphoretic steels of converter | |
| CN104531940A (en) | Converter final slag thickening method | |
| CN109234489A (en) | The control method of catch carbon stage nitrogen increased amount is reduced when a kind of converter smelting mild steel | |
| CN104263875A (en) | Dephosphorizing method for producing alloy weld line steel from high-phosphorus molten iron by top-blown converter | |
| CN103773918B (en) | A kind ofly reduce the method that sulphur is returned in semi-steel making converter | |
| CN103966387B (en) | Adopt the method for semi-steel making | |
| CN106244898B (en) | A kind of production method of Low-phosphorus Steel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170724 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |