CN102634630A - Modifier for slag splashing protection of converter and using method of the modifier - Google Patents
Modifier for slag splashing protection of converter and using method of the modifier Download PDFInfo
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- CN102634630A CN102634630A CN2012101442132A CN201210144213A CN102634630A CN 102634630 A CN102634630 A CN 102634630A CN 2012101442132 A CN2012101442132 A CN 2012101442132A CN 201210144213 A CN201210144213 A CN 201210144213A CN 102634630 A CN102634630 A CN 102634630A
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- slag
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- modification agent
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Abstract
The invention discloses a modifier for slag splashing protection of a converter and a using method of the modifier, belonging to the technical field of converter steelmaking. The modifier consists of the following components by mass: 18%-33% of Al2O3, 40%-60% of CaO, 0.5%-2.0% of FeO, 6%-13% of MgO, 6%-15% of SiO2 and the balance of impurities, wherein the impurities include phosphorus impurities, sulfur impurities and manganic oxide and the diameter of the particle of the modifier is 3-20mm. The using method of the modifier comprises the steps of adding 1.5kg-4.0kg of the modifier for each ton of steel through an overhead bunker of the converter when slag splashing protection begins, and adding 5kg-10kg of the modifier for each ton of steel for curing the slags after slag splashing protection is finished. The temperature of the slags is measured, the temperature at the slag surface is 1,200-1,350 DEG C, and molten iron is charged after scrap steel is added. The modifier has the advantages of lowering the temperature of the slags during the process of slag splashing protection and playing a role of curing the slags.
Description
Technical field
The invention belongs to the converter steeling technology field, particularly related to a kind of splashing slag in converter with modification agent and method of use.To cooling, Mechanical Crushing, the screening of refining slag, adopt special process to add to control the rational slag splashing time and to solidify slag then in converter, produce splash when preventing to stay slag.
Background technology
Remained converter slag operation can reduction converter smelting iron and steel stock consumption, reduction converter smelting lime consumption, the favourable stove slag that makes down form fast, improve smelting initial stage dephosphorization efficient; Help smelting the raising of initial stage basicity of slag, improve furnace life; Disadvantageous effect is, stay slag after hot metal charging be prone to take place splash, reason is that carbon is met hyperoxia voltinism slag in the molten iron, and vigorous reaction takes place, and emits a large amount of CO gases, causes ejection stoves such as molten iron, slag to cause security incident outward.Therefore stay and to add modification agent before the slag operation and carry out slag and solidify.
Domestic other producers implement to stay the slag operation situation following:
Mei Shan Iron And Steel Plant converter smelting finishes to stay slag about 1/3; And add crushed coke in the slag toward staying, the crushed coke diameter is less than 5mm, and the back adds lime toward staying in the slag, the steel scrap cooling stays slag to improve the viscosity of staying slag; The lime add-on is the 15kg/t slag, the little and 1t of adding amount of scrap steel; Adopt the iron mode of converting slowly.
Shi Gang stays the quantity of slag about 3.5 tons, adds lime 500kg and cools off, and add steel scrap, adopts the mode of slowly converting iron, thinks that finally iron and steel consumption reduces 50kg/t, and lime, oxygen depletion also obviously reduce.
The method of staying slag operation has been adopted in 90 tons of converters of Anshan Iron and Steel Works II, thinks that to stay the quantity of slag the most reasonable at 1/3 o'clock, and finishing slag basicity can stay slag greater than 3 o'clock, adds an amount of rhombspar before the slag splashing, converts to add part more in advance before the iron and smelt required lime.The adding in advance of lime both can shift to an earlier date fritting, also can slow down the impact of molten iron to slag.
The slag operation technology of staying that Nangang adopts is: in slag, add coke 20～30kg, lime 200 ~ 250kg/t slag adds steel scrap again.Final saving lime 30kg/t steel, and also can improve scrap ratio.
Iron and steel 65 tons of top and bottom combined blown converter steelmaking factories in Nanchang are studied staying slag operation; Think that preceding 30 stoves of stove labour do not adopt and stay slag operation; And terminal point [C] is not less than 0.06%; Terminal temperature is not higher than 1710 ℃. and add adjusting material 200～300kg before the slag splashing, slag splashing finishes the back and in slag, adds 300～500kg lime.
Climb steel [6] and when the smelting high carbon steel, stay slag 1～1.3t, add lime and each 1t of rhombspar, in smelting, during low-carbon (LC), gone out respectively 1.5 tons of steel adding lime and rhombspars, add lime and rhombspar after staying slag.
This technology is different with other steel mill's technologies, and returning slag with refining is raw material, and different adding modes are adopted in the processing back.Employing can be controlled the slag slag splashing time after should inventing, and had strengthened the solidification effect of slag simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of splashing slag in converter with modification agent and method of use.
Modification agent composition quality per-cent of the present invention is Al
2O
3: 18%～33%, CaO:40%～60%, FeO:0.5%～2.0%, MgO:6%～13%, SiO
2: 6%～15%; All the other are impurity, and impurity comprises the oxide compound of phosphorus, sulphur impurity, manganese; The modification agent granularity is diameter 3mm～20mm particle; Modification agent prepares through following method: adopting the LF refining slag is raw material, and the material composition mass percent is Al
2O
3: 18%～33%, CaO:40%～60%, FeO:0.5%～2.0%, MgO:6%～13%, SiO
2: 6%～15%; All the other are impurity; Adopt the air cooling mode to be cooled to room temperature raw material, use Mechanical Crushing then, sieve after the fragmentation, choosing diameter is the particle of 3mm～20mm granularity, is modification agent.
The method of use of above-mentioned modification agent: add modification agent ton steel 1.5kg/t～4.0kg/t through the converter high hopper when slag splashing begins, slag splashing finishes this kind of back adding modification agent ton steel 5kg/t～10kg/t and solidifies slag.
Slag is carried out thermometric, and the slag surface temperature is 1200 ℃～1350 ℃, converts iron behind the adding steel scrap, the no splash of safety.
The present invention has advantage and effect: both can play and reduce the lime effect, play the effect of dephosphorizing process slag simultaneously, protect and add modification agent in the process and can also reduce slag temperature spattering slag, play the effect of solidifying slag.
Embodiment
Embodiment 1:
Adopt 100 tons of converters to implement, correlation parameters such as converter terminal carbon content, converter terminal molten steel oxygen level are as shown in the table: converter terminal carbon content: 0.05wt%; Carbon oxygen is long-pending: 0.0027; Converter tapping temperature: 1688 ℃; The slag splashing time: 4.0 minutes.
A kind of splashing slag in converter is used modification agent.Composition quality per-cent is Al
2O
3: 26.33%, CaO:52.57%, FeO:0.65%, MgO:9.30%, SiO
2: 7.79%; All the other are impurity, MnO:1.1%, P
2O
5: 0.039%, R:6.75%, TFe:0.63% etc.
1, adopt method for air-cooling that it is cooled to room temperature the modification agent raw material, use mechanical process broken then, sieve after the fragmentation, the particle of choosing diameter length and be 15mm left and right sides granularity is as modification agent.
Add modification agent 200kg through the converter high hopper when 2, splashing slag in converter begins, slag splashing finishes back adding modification agent 800kg slag is cured.
3, then slag is carried out thermometric, the slag surface temperature is 1302 ℃.Convert iron after adding steel scrap, the no splash of safety.
Embodiment 2:
Adopt 100 tons of converters to implement, correlation parameters such as converter terminal carbon content, converter terminal molten steel oxygen level are as shown in the table: converter terminal carbon content: 0.06wt%; Carbon oxygen is long-pending: 0.0028; Converter tapping temperature: 1700 ℃; The slag splashing time: 3.5 minutes.
A kind of splashing slag in converter is used modification agent.Composition quality per-cent is Al
2O
3: 23.49%, CaO:55.74%, FeO:0.86%, MgO:7.94%, SiO
2: 8.03%; All the other are impurity, MnO:0.8%, P
2O
5: 0.042%, R:6.94% etc.
1, adopt method for air-cooling that it is cooled to room temperature the modification agent raw material, use mechanical process broken then, sieve after the fragmentation, the particle of choosing diameter length and be 15mm left and right sides granularity is as modification agent.
Add modification agent 300kg through the converter high hopper when 2, splashing slag in converter begins, slag splashing finishes back adding modification agent 1000kg slag is cured.
3, then slag is carried out thermometric, the slag surface temperature is 1287 ℃.Convert iron after adding steel scrap, the no splash of safety.
Claims (3)
1. a splashing slag in converter is used modification agent, it is characterized in that, modification agent composition quality per-cent is Al
2O
3: 18%～33%, CaO:40%～60%, FeO:0.5%～2.0%, MgO:6%～13%, SiO
2: 6%～15%; All the other are impurity, and impurity comprises the oxide compound of phosphorus, sulphur impurity, manganese; The modification agent granularity is diameter 3mm～20mm particle; Modification agent prepares through following method: adopting the LF refining slag is raw material, and the material composition mass percent is Al
2O
3: 18%～33%, CaO:40%～60%, FeO:0.5%～2.0%, MgO:6%～13%, SiO
2: 6%～15%; All the other are impurity; Adopt the air cooling mode to be cooled to room temperature raw material, use Mechanical Crushing then, sieve after the fragmentation, choosing diameter is the particle of 3mm～20mm granularity.
2. the method for use of the described modification agent of claim 1; It is characterized in that; Add modification agent ton steel 1.5kg/t～4.0kg/t through the converter high hopper when slag splashing begins, slag splashing finishes this kind of back adding modification agent ton steel 5kg/t～10kg/t and solidifies slag.
3. method of use according to claim 2 is characterized in that, the slag surface temperature is 1200 ℃～1350 ℃, converts iron, no splash behind the adding steel scrap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101442132A CN102634630A (en) | 2012-05-10 | 2012-05-10 | Modifier for slag splashing protection of converter and using method of the modifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101442132A CN102634630A (en) | 2012-05-10 | 2012-05-10 | Modifier for slag splashing protection of converter and using method of the modifier |
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| CN102634630A true CN102634630A (en) | 2012-08-15 |
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| CN2012101442132A Pending CN102634630A (en) | 2012-05-10 | 2012-05-10 | Modifier for slag splashing protection of converter and using method of the modifier |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912085A (en) * | 2012-11-09 | 2013-02-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN104673962A (en) * | 2015-03-16 | 2015-06-03 | 攀钢集团研究院有限公司 | Slag state regulator for slag splashing protection of vanadium-chromium recovery converter |
| CN104694703A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Modifier for splashing slag furnace protecting for vanadium-chromium extracting converter |
| CN106319140A (en) * | 2015-06-29 | 2017-01-11 | 鞍钢股份有限公司 | Energy-saving environment-friendly converter slag splashing regulator and preparation method thereof |
| CN113234887A (en) * | 2021-05-19 | 2021-08-10 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
| CN113897471A (en) * | 2021-09-26 | 2022-01-07 | 天津市新天钢钢铁集团有限公司 | Method for inhibiting converter splashing by LF refining slag |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
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2012
- 2012-05-10 CN CN2012101442132A patent/CN102634630A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102337373A (en) * | 2011-11-07 | 2012-02-01 | 秦皇岛首秦金属材料有限公司 | Using method for recovering refining slag and recycling in converter |
Non-Patent Citations (1)
| Title |
|---|
| 苏兴文等: "冶金渣的循环利用-LF炉精炼炉渣用作转炉助熔剂", 《第七届(2009)中国钢铁年会论文集》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102912085A (en) * | 2012-11-09 | 2013-02-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN102912085B (en) * | 2012-11-09 | 2014-08-06 | 四川金广技术开发有限公司 | Stainless steel smelting method for improving content of MgO in slag of gas oxygen refining converter and LF (ladle furnace) |
| CN104673962A (en) * | 2015-03-16 | 2015-06-03 | 攀钢集团研究院有限公司 | Slag state regulator for slag splashing protection of vanadium-chromium recovery converter |
| CN104694703A (en) * | 2015-03-16 | 2015-06-10 | 攀钢集团研究院有限公司 | Modifier for splashing slag furnace protecting for vanadium-chromium extracting converter |
| CN104694703B (en) * | 2015-03-16 | 2017-02-01 | 攀钢集团研究院有限公司 | Modifier for splashing slag furnace protecting for vanadium-chromium extracting converter |
| CN104673962B (en) * | 2015-03-16 | 2017-02-22 | 攀钢集团研究院有限公司 | Slag state regulator for slag splashing protection of vanadium-chromium recovery converter |
| CN106319140A (en) * | 2015-06-29 | 2017-01-11 | 鞍钢股份有限公司 | Energy-saving environment-friendly converter slag splashing regulator and preparation method thereof |
| CN113234887A (en) * | 2021-05-19 | 2021-08-10 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
| CN113234887B (en) * | 2021-05-19 | 2022-03-22 | 攀钢集团研究院有限公司 | Slag regulating agent for washing furnace bottom and use method thereof |
| CN113897471A (en) * | 2021-09-26 | 2022-01-07 | 天津市新天钢钢铁集团有限公司 | Method for inhibiting converter splashing by LF refining slag |
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Application publication date: 20120815 |