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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
slag
modifier
modification agent
converter
steel
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.)
Pending
Application number
CN2012101442132A
Other languages
Chinese (zh)
Inventor
许晓东
吕延春
秦登平
王星
王文军
刘洋
朱志远
张翔
朱国森
崔阳
姜中行
李海波
李战军
王海宝
王浩然
孙硕猛
危尚好
郝宁
白学军
周金明
刘金刚
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shougang Corp
Original Assignee
Shougang Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shougang Corp filed Critical Shougang Corp
Priority to CN2012101442132A priority Critical patent/CN102634630A/en
Publication of CN102634630A publication Critical patent/CN102634630A/en
Pending legal-status Critical Current

Links

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

A kind of splashing slag in converter is with modification agent and method of use
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.
CN2012101442132A 2012-05-10 2012-05-10 Modifier for slag splashing protection of converter and using method of the modifier Pending CN102634630A (en)

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

Publications (1)

Publication Number Publication Date
CN102634630A true CN102634630A (en) 2012-08-15

Family

ID=46619205

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012101442132A Pending CN102634630A (en) 2012-05-10 2012-05-10 Modifier for slag splashing protection of converter and using method of the modifier

Country Status (1)

Country Link
CN (1) CN102634630A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
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 type converter slag splashing conditioning agent and preparing 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)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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 type converter slag splashing conditioning agent and preparing 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

Similar Documents

Publication Publication Date Title
CN102634630A (en) Modifier for slag splashing protection of converter and using method of the modifier
CN105349728B (en) A kind of method of vanadium-bearing hot metal converter Dephosphorization vanadium extraction
CN100469932C (en) V2O5 direct alloying steelmaking technology
CN102212643B (en) Converter less-slag smelting process
CN102660658B (en) Method for curing converter slag
CN103498016B (en) Dephosphorization agent prepared by taking slag of decarbonization furnace as raw material and molten iron dephosphorization method
CN103146873A (en) Enriching sludge ball for semisteel steelmaking and slagging method for semisteel steelmaking
CN109097522B (en) Converter smelting method for molten steel residual manganese at medium-high manganese, high phosphorus and low silicon iron water extraction and improvement end point
CN103993134A (en) Steelmaking slag melting agent and use method thereof
CN104060020B (en) A kind of dephosphorization method for making steel improving converter terminal molten steel Fe content
CN103205536A (en) Semi-steel dephosphorizing agent and semi-steel dephosphorizing method
CN103643094B (en) The smelting process of high carbon ferromanganese
CN101775464A (en) Micro carbon micro phosphorus aluminum manganese iron alloy as well as production method thereof
CN109082583B (en) Method for producing gray cast iron at low cost
CN102534273A (en) Process for smelting ferromolybdenum through silico-aluminum thermic method
CN103643056B (en) The smelting process of low carbon ferromanganese
CN103343180B (en) Preparation method of converter steelmaking synthetic slag former
CN101633970A (en) Method for producing molten iron for casting by using medium frequency furnace and iron scrap
CN103088245A (en) Manganese-iron alloy
CN103343179B (en) Converter steelmaking synthetic slag former
Duan et al. EAF steelmaking process with increasing hot metal charging ratio and improving slagging regime
CN110699511B (en) Method for smelting high-silicon molten iron
CN112593048A (en) Semisteel desulfurization method
CN108754063B (en) Dephosphorization production process for H08A series steel
CN105483316A (en) Direct alloying method of chrome ores in converter

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20120815