CN101029347A - Pre-melt steel ladle refined slag for cryogenic desulfurization - Google Patents
Pre-melt steel ladle refined slag for cryogenic desulfurization Download PDFInfo
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- CN101029347A CN101029347A CN 200610024191 CN200610024191A CN101029347A CN 101029347 A CN101029347 A CN 101029347A CN 200610024191 CN200610024191 CN 200610024191 CN 200610024191 A CN200610024191 A CN 200610024191A CN 101029347 A CN101029347 A CN 101029347A
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- slag
- desulfurization
- steel
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- ladle
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Abstract
A steel bag fine slag consists of CaO 50-56wt%, MgO 3-6wt%, Al2O3 32-38wt%, SiO2<=6wt%, S+P<=0.05wt% and H2O<=0.5wt%. The process is carried out by selecting limestone, high-alumium alumina clinker and magnesium clinker, proportioning, melting at high-temperature furnace, cooling, crushing into 5-30mm grain and packing. It has shorter LF furnace slagging time and treatment period. It can be used for cryogenic desulfurization of steel-water fine LF furnace.
Description
Technical field: the present invention relates to the ladle refining slag that is used to make steel, particularly a kind of pre-molten ladle refining slag that is used for dark desulfurization.
Background technology: Chinese patent 00115431.1 discloses pre-smelted steel ladle slag reductant of a kind of ferrous metallurgy steel-making usefulness and preparation method thereof.The pre-smelted steel ladle slag reductant of this invention combines the conditioning agent in the existing reductive agent and the composition of reductive agent, and its composition is by weight percentage: metal A l 25～40%, pre-melt CaO 25～45%, Al
2O
320～35%, reaction promotor CaCO
32～8%.Its preparation method is: earlier raw material limestone, bauxite are melted, cool off, are broken into granular pre-melt in 1300～1600 ℃ of High Temperature Furnaces Heating Apparatuss; Then with pre-melt of metal A l powder or granule and granular CaCO
3The adding additives that is mixed stirs, and pressurization globulate or elliposoidal moulding mixture toast in 150～300 ℃ of tunnel furnace at last on pressure forming machine, pack after the cooling.The pre-smelted steel ladle slag reductant of this invention can be simplified ladle slag reduction treatment process, improves reductive agent utilization ratio and reduction treatment effect.Should existing patent pre-melt and metal A l powder and granulous CaCO have been adopted
3The adding additives that is mixed forms Al content and reaches 25～40% ladle slag reductive agent, and its main purpose is the iron oxide reduction in the slag of the ladle the superiors, reduces the oxidisability in the ladle slag, for molten steel desulfurizing creates conditions.When carrying out desulfurization, sweetening agent must be added in addition, the requirement of deep desulfuration can't be satisfied.
Summary of the invention: the purpose of this invention is to provide a kind of pre-molten ladle refining slag that can deep desulfuration.Mainly solve the technical problem that existing refining slag can't deep desulfuration.Technical scheme of the present invention is: a kind of pre-molten ladle refining slag that is used for dark desulfurization, and the weight percent of its moiety is: CaO 50～56%, and MgO 3～6%, Al
2O
332～38%, SiO
2≤ 6%, S+P≤0.05%, H
2O≤0.5%.The granularity of refining slag is controlled at 5～30mm.
CaO/Al
2O
3Value to be controlled in 1.3～1.8 scopes that (this is that requirement has added and makes CaO/Al in the composition of final steel cinder inclusion behind refining slag of the present invention and other synthetic slag
2O
3Value be controlled in 1.5～2.0 scopes CaO/Al
2O
3Value in this scope the time, the sulfur capacity of slag has improved, and can hold the sulfide that sulphur in the more molten steel and slag reaction generate, this helps the deep desulfuration of molten steel), the strict demand for sulphur content in the molten steel in the Wide and Thick Slab steel grade is [S]≤5ppm.
Its preparation method: raw material is selected Wingdale, bauxite chamotte and magnesia for use, carry out proportioning according to above-mentioned pre-molten ladle refining slag composition scope, and enter in the High Temperature Furnaces Heating Apparatus after at room temperature mixing and melt, cool off, be broken into the granular of 5～30mm, requirement is packaged as finished product according to weight then.
The invention has the beneficial effects as follows: for the suitable quantity of slag, slag ingredient being arranged before the desulfurization of LF stove and accelerating the desulfurization of LF slagging, employing the time adds pre-molten ladle refining slag and lime technology in advance by tapping behind the converter stove, make LF stove slagging early, not only favourable to dark desulfurization, also can shorten the LF stove slag making time, handle cycle time thereby can shorten the LF stove, satisfy the requirement that continuous casting waters repeatedly.In order to reach the ladle slag system requirement of the dark desulfurization of refining, CaO/Al in the ladle slag
2O
3Value to be controlled in 1.5～2.0 scopes, according to the quantity of slag under the converter tapping and go out the slag system composition that steel alloying produces, need in ladle, add the part refining slag and make the composition of ladle slag reach the requirement of dark desulfurization.Simultaneously, in order to shorten the time of dark desulfurization, adopt the slag charge of pre-molten can reach this purpose.
The added pre-molten ladle of converter ladle refining slag 8 stove data (concrete data see Table 1) have been added up, can find out and keep under the constant substantially situation of total desulfurization quantity of slag, desulfurization degree average out to 61.8%, be up to 90%, illustrate that sweetening power does not descend, the particularly average LF processing cycle is 43.5min, compare obvious shortening with original continuous casting to steel grade LF stove average treatment cycle 45～48min, therefore pre-molten ladle refining slag is under the prerequisite that guarantees sweetening effectiveness, shorten LF and handled the cycle, improved refining efficiency, for watering repeatedly of continuous casting created good condition.
Table 1 LF uses pre-molten ladle refining slag desulfurization degree actual achievement
| Date | LF handles number | Steel grade | LF handles cycle, min | [S] content, ppm | Desulfurization degree, % | ||
| Target | Before the processing | After the processing | |||||
| 1.28 | 608845 | JT6411A6 | 40 | 20 | 42 | 4 | 90.5 |
| 1.31 | 608890 | JU5714A6 | 41 | 40 | 74 | 37 | 50.0 |
| 1.31 | 608891 | JU5714A6 | 43 | 40 | 83 | 22 | 73.5 |
| 1.31 | 608892 | JU5714A6 | 38 | 40 | 45 | 23 | 48.9 |
| 1.31 | 608893 | JU5714A6 | 48 | 40 | 58 | 25 | 56.9 |
| 1.31 | 608894 | JU5714A6 | 42 | 40 | 84 | 40 | 52.4 |
| 1.31 | 608895 | JU5714A6 | 49 | 40 | 72 | 28 | 61.1 |
| 1.31 | 608896 | JU5714A6 | 47 | 40 | 79 | 31 | 60.8 |
| On average | 43.5 | 67.1 | 26.3 | 61.8 | |||
Embodiment:
Embodiment 1:2004 June 10, grade of steel 89 adds pre-molten ladle refining slag 800kg, and it consists of: CaO56%, Al
2O
332%, MgO 3.2%, SiO
24.5%, S+P 0.042%, and the LF stove is handled 45min, and [S] content drops to 4ppm from 31ppm in the steel, and desulfurization degree reaches 87.1%.
Embodiment 2:2005 January 31, grade of steel 52 adds pre-molten ladle refining slag 800kg, and it consists of: CaO53%, Al
2O
335%, MgO 4.8%, SiO
23.7%, S+P 0.049%, and the LF stove is handled 43min, and [S] content drops to 22ppm from 83ppm in the steel, and desulfurization degree reaches 73.5%.
Embodiment 3:2005 March 25, grade of steel 67 adds pre-molten ladle refining slag 800kg, and it consists of: CaO50%, Al
2O
338%, MgO 5.6%, SiO
25.2%, S+P 0.045%, and the LF stove is handled 46min, and [S] content drops to 15ppm from 42ppm in the steel, and desulfurization degree reaches 64.3%.
Claims (3)
1, a kind of pre-molten ladle refining slag that is used for dark desulfurization, the weight percent of its moiety is: CaO 50～56%, and MgO 3～6%, Al
2O
332～38%, SiO
2≤ 6%, S+P≤0.05%, H
2O≤0.5%.
2, a kind of pre-molten ladle refining slag that is used for dark desulfurization according to claim 1 is characterized in that CaO/Al
2O
3Value be 1.3～1.8.
3, a kind of pre-molten ladle refining slag that is used for dark desulfurization according to claim 1 is characterized in that the granularity of refining slag is 5～30mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024191 CN101029347A (en) | 2006-02-28 | 2006-02-28 | Pre-melt steel ladle refined slag for cryogenic desulfurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610024191 CN101029347A (en) | 2006-02-28 | 2006-02-28 | Pre-melt steel ladle refined slag for cryogenic desulfurization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101029347A true CN101029347A (en) | 2007-09-05 |
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ID=38714897
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|---|---|---|---|
| CN 200610024191 Pending CN101029347A (en) | 2006-02-28 | 2006-02-28 | Pre-melt steel ladle refined slag for cryogenic desulfurization |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102277472A (en) * | 2011-08-22 | 2011-12-14 | 辽宁天和科技股份有限公司 | Quick deep desulfurization method and deep desulfurizing agent for LF (Ladle Furnace) refining |
| CN102344997A (en) * | 2011-10-02 | 2012-02-08 | 北京科技大学 | High-calcium high-aluminum fluorine-free refining slags for producing high purity steel and refining method |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN101993979B (en) * | 2009-08-10 | 2013-10-16 | 鞍钢股份有限公司 | Premelting compound refining slag for producing ultra-low sulfur steel |
| CN104250674A (en) * | 2013-06-27 | 2014-12-31 | 宜兴市瑞华工业炉科技有限公司 | Refined synthetic slag for smelting high-standard bearing steel and preparation method thereof |
| CN109338034A (en) * | 2018-09-20 | 2019-02-15 | 江苏大学 | A kind of high reproducibility LF slag system of low cost and the method for smelting aluminum killed steel |
| CN110106313A (en) * | 2019-04-30 | 2019-08-09 | 上海盛宝冶金科技有限公司 | A kind of refining slag and its methods for making and using same |
-
2006
- 2006-02-28 CN CN 200610024191 patent/CN101029347A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101993979B (en) * | 2009-08-10 | 2013-10-16 | 鞍钢股份有限公司 | Premelting compound refining slag for producing ultra-low sulfur steel |
| CN102277472A (en) * | 2011-08-22 | 2011-12-14 | 辽宁天和科技股份有限公司 | Quick deep desulfurization method and deep desulfurizing agent for LF (Ladle Furnace) refining |
| CN102344997A (en) * | 2011-10-02 | 2012-02-08 | 北京科技大学 | High-calcium high-aluminum fluorine-free refining slags for producing high purity steel and refining method |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560006B (en) * | 2011-12-28 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102560131B (en) * | 2011-12-28 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102943150A (en) * | 2012-11-26 | 2013-02-27 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN102943150B (en) * | 2012-11-26 | 2015-03-04 | 湖南华菱湘潭钢铁有限公司 | Refined slag control method |
| CN104250674A (en) * | 2013-06-27 | 2014-12-31 | 宜兴市瑞华工业炉科技有限公司 | Refined synthetic slag for smelting high-standard bearing steel and preparation method thereof |
| CN109338034A (en) * | 2018-09-20 | 2019-02-15 | 江苏大学 | A kind of high reproducibility LF slag system of low cost and the method for smelting aluminum killed steel |
| CN110106313A (en) * | 2019-04-30 | 2019-08-09 | 上海盛宝冶金科技有限公司 | A kind of refining slag and its methods for making and using same |
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