CN106555020A - A kind of method for improving blast-furnace slag performance - Google Patents
A kind of method for improving blast-furnace slag performance Download PDFInfo
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- CN106555020A CN106555020A CN201510635384.9A CN201510635384A CN106555020A CN 106555020 A CN106555020 A CN 106555020A CN 201510635384 A CN201510635384 A CN 201510635384A CN 106555020 A CN106555020 A CN 106555020A
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Abstract
The invention discloses a kind of method for improving blast-furnace slag performance, in mainly solving prior art, blast furnace produces Al in brought blast furnace slag using high alumina iron ore stone2O3Content is high and cause blast furnace slag poor mobile performance, affect the technical problem of smooth operation of furnace.Scheme is：A kind of method for improving blast-furnace slag performance, including：1）Blast furnace is conventionally loaded into furnace charge, starts to smelt；2）Dual alkalinity in blast furnace slag is controlled in blast furnace ironmaking processm(CaO)/m(SiO2) for 1.20-1.27, quaternary basicity R4For 0.94-1.0, magnalium ratio is 0.40-0.45, Al in blast furnace slag2O3Weight/mass percentage composition be 15.5-17%, in blast furnace slag the weight/mass percentage composition of MnO be 0.2-0.4%；3）Normally tap a blast furnace.The inventive method produces in brought blast furnace slag Al using high alumina iron ore stone in blast furnace2O3The high situation of content realizes the direct motion of blast furnace economical production.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, is related to a kind of method for improving blast-furnace slag performance.
Background technology
Increasing substantially due to iron and steel production capacity in recent years, iron ore resource wretched insufficiency, many steel mills have to adopt high alumina iron ore stone in a large number so that the Al in blast furnace ironmaking slag2O3Content is raised, and the blast furnace of many producers has the trend for increasing to 15.5% to be even up to 16%, and the metallurgical performance of slag occurs（Melting temperature and viscosity are raised）Deterioration, causes maintaining blast furnace difficult, shaft wall accretion occurs, and slag iron difficulty goes out, and the pig iron factor of merit declines, and have impact on the stable smooth operation of blast fumance.
In blast furnace ironmaking production, as the Al in blast-furnace slag2O3When content increases, existing process one is by increasing the content of MgO in slag while reducing slag dual alkalinitym(CaO)/m(SiO2) obtaining the suitable metallurgical performance of slag, so as to the stable smooth operation for ensureing blast furnace is produced, but, this will increase the quantity of slag of blast furnace（Multiplex flux containing MgO）, so as to increase the fuel consumption of blast furnace ironmaking, while quantity of slag increase can also affect blast furnace process stroke, this can all increase blast furnace ironmaking cost；Two is to limit to use high alumina iron ore stone, the high price iron ore of multiplex low aluminum, and this obviously can also increase blast furnace ironmaking cost, be unfavorable for the cost efficiency and resource rational utilization of iron and steel enterprise.
The content of the invention
It is an object of the invention to provide a kind of method for improving blast-furnace slag performance, mainly solves existing blast furnace and produces Al in brought blast furnace slag using high alumina iron ore stone2O3Content is high and cause blast furnace slag poor mobile performance, affect the technical problem of smooth operation of furnace.
The technical solution used in the present invention is：
1) blast furnace is conventionally loaded into furnace charge, starts to smelt；
2) dual alkalinity in blast furnace slag is controlled in blast furnace ironmaking process m (CaO）/ m （SiO2）（R2) for 1.20-1.27, quaternary basicity R4For 0.94-1.0, magnalium ratio is 0.40-0.45, Al in blast furnace slag2O3Weight/mass percentage composition be 15.5-17%, in blast furnace slag the weight/mass percentage composition of MnO be 0.2-0.4%；
3) normally tap a blast furnace.
Dual alkalinity of the present inventionR 2Calculating formula be：R 2=
Formula 1, in formula 1m(CaO) it is the weight/mass percentage composition of CaO in blast furnace slag,m(MgO) it is the weight/mass percentage composition of MgO in blast furnace slag.
Quaternary basicity R of the present invention4Calculating formula be：R4= Formula 2, in formula 2m(CaO+MgO）For the weight/mass percentage composition sum of CaO in blast furnace slag and MgO,m(SiO2+Al2O3) for SiO in blast furnace slag2And Al2O3Weight/mass percentage composition sum.
The calculating formula of magnalium ratio of the present invention is：Mg/Al=Formula 3, in formula 3m(MgO) it is the weight/mass percentage composition of MgO in blast furnace slag,m(Al2O3) for Al in blast furnace slag2O3Weight/mass percentage composition.
The weight/mass percentage composition of each composition of blast furnace slag of the present invention, by Ore used by blast fumance and fuel（Containing coke and coal injection）Composition Control and usage amount coordinate realize.
The inventive method is based on following experimentation：Blast-furnace slag in the molten state, is made up of the ion with positive and negative charge or ion cluster.So-called ion cluster refers to that some cationes constitute the different load anion radical of complexity with oxonium ion.Wherein electrically charged many Si4+The cation O minimum with radius in anion2-Ion produces very big active force, and attract each other generation（SiO4)4-, the gas ions can be polymerized circlewise, the labyrinth such as chain, so as to have impact on the movement of particle, the viscosity and melting temperature for showing slag discharging is raised, and produces following reaction：
（SiO4)4-+（SiO4)4-+（SiO4)4- （Si3O9)6-+3O2-
Because oxonium ion is provided by basic anhydride, basicity is properly increased (containing binary and quaternary basicity）Namely increase CaO content, the impact that MgO reduces bringing can be made up, there is provided enough oxonium ions, it is simple to make the silicon oxyanion of labyrinth roll into a ball disintegration（SiO4)4-Gas ions, so as to improve the metallurgical performance of slag.
As the Al in blast-furnace slag2O3When content increases to 15.5-17.0%, the present invention adopts relatively low magnalium ratio, MgO weight/mass percentage compositions to be controlled to 6-8%, by controlling dual alkalinity, two parameters of quaternary basicity, to improve the basic anhydride content in slag, the mainly content of CaO realizes the improvement of slag metallurgical performance；The present invention does not additionally increase the MgO weight/mass percentage compositions in blast furnace slag, it is not necessary to increase the blast furnace quantity of slag.
The present invention has following good effect compared to existing technology：
The present invention produces in brought blast furnace slag Al using high alumina iron ore stone for blast furnace2O3Content is high and cause blast furnace slag poor mobile performance, by controlling magnalium ratio in blast furnace slag, dual alkalinity, the control of quaternary basicity, it is effectively improved or maintains the reasonable melting temperature and the viscosity of high-temperature region of blast furnace slag, in the situation for not increasing the blast furnace quantity of slag, the stable smooth operation of blast fumance is maintained, blast-melted smelting cost is reduced.
Description of the drawings
Fig. 1 is the temperature-viscosity curve of common process blast furnace slag；
Fig. 2 is the temperature-viscosity curve of 1 blast furnace slag of the embodiment of the present invention；
Fig. 3 is the temperature-viscosity curve of 2 blast furnace slag of the embodiment of the present invention.
Specific embodiment
Below by way of specific embodiment, the present invention is further detailed explanation.
Using common process and the inventive method in 3250m3Data in blast fumance, the main chemical compositions of blast furnace slag are shown in Table 1.
Main chemical compositions in 1 blast furnace slag of the present invention of table（Weight/mass percentage composition, %）
The blast furnace slag of acquisition is carried out into blast furnace slag temperature -- viscosity test, detection data are shown in Table 2.
The viscosity and melting temperature value of 2 blast furnace slag of the present invention of table
Referring to Fig. 1, Fig. 2, Tables 1 and 2,1 blast furnace slag of embodiment is 0.268Pas in 1500 DEG C of viscosity, when 1450 DEG C, viscosity is 0.383Pas, its melting temperature Tm is 1371 DEG C, in the range of blast furnace normally 1450 DEG C -1500 DEG C of the slag temperature of production, 1 blast furnace slag of embodiment is more excellent than the metallurgical performance of common process blast furnace slag, advantageously in the stable smooth operation of blast fumance.Blast furnace actual production is controlled using this blast furnace slag, good technical-economic index is obtained.
Referring to Fig. 1, Fig. 3, Tables 1 and 2, viscosity of 2 blast furnace slag of embodiment at 1500 DEG C is 0.280Pas, at 1450 DEG C, slag viscosity is 0.423Pas, and in the range of blast furnace normally 1450 DEG C -1500 DEG C of the slag temperature of production, embodiment 2 is more excellent than the metallurgical performance of common process blast furnace slag.Blast furnace actual production is controlled using this blast furnace slag, good technical-economic index is obtained.
Claims (1)
1. a kind of method for improving blast-furnace slag performance, is characterized in that, comprise the following steps：
1）Blast furnace is conventionally loaded into furnace charge, starts to smelt；
2）Dual alkalinity R in blast furnace slag is controlled in blast furnace ironmaking process2For 1.20-1.27, quaternary basicity R4For 0.94-1.0, magnalium ratio is 0.40-0.45, Al in blast furnace slag2O3Weight/mass percentage composition be 15.5-17%, in blast furnace slag the weight/mass percentage composition of MnO be 0.2-0.4%；
3）Normally tap a blast furnace.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811098A (en) * | 2019-02-25 | 2019-05-28 | 中普（邯郸）钢铁有限公司 | A kind of low silicon smelting method of 1000 cubes of grade blast furnaces |
| CN112626296A (en) * | 2020-12-17 | 2021-04-09 | 本钢板材股份有限公司 | Method for optimizing fluidity of low-aluminum slag |
| CN113801969A (en) * | 2021-08-19 | 2021-12-17 | 鞍钢股份有限公司 | Ultrahigh TiO (titanium dioxide)2Blast furnace smelting method of furnace slag |
| CN113846197A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Method for improving desulfurization rate of molten iron |
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| CN102864258A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method or improving properties of blast furnace slag |
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- 2015-09-30 CN CN201510635384.9A patent/CN106555020A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102864258A (en) * | 2012-10-08 | 2013-01-09 | 武汉钢铁(集团)公司 | Method or improving properties of blast furnace slag |
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| 沈峰满等: "配比调一调 节支又降耗——国内外高炉渣镁铝比的对比分析", 《中国冶金报》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109811098A (en) * | 2019-02-25 | 2019-05-28 | 中普（邯郸）钢铁有限公司 | A kind of low silicon smelting method of 1000 cubes of grade blast furnaces |
| CN113846197A (en) * | 2020-06-28 | 2021-12-28 | 宝山钢铁股份有限公司 | Method for improving desulfurization rate of molten iron |
| CN112626296A (en) * | 2020-12-17 | 2021-04-09 | 本钢板材股份有限公司 | Method for optimizing fluidity of low-aluminum slag |
| CN113801969A (en) * | 2021-08-19 | 2021-12-17 | 鞍钢股份有限公司 | Ultrahigh TiO (titanium dioxide)2Blast furnace smelting method of furnace slag |
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Application publication date: 20170405 |