CN102864258A - Method or improving properties of blast furnace slag - Google Patents
Method or improving properties of blast furnace slag Download PDFInfo
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- CN102864258A CN102864258A CN2012103764130A CN201210376413A CN102864258A CN 102864258 A CN102864258 A CN 102864258A CN 2012103764130 A CN2012103764130 A CN 2012103764130A CN 201210376413 A CN201210376413 A CN 201210376413A CN 102864258 A CN102864258 A CN 102864258A
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Abstract
A method or improving properties of blast furnace slag includes the steps of conventionally charging materials and smelting; jetting well mixed coal and magnesia at a tuyere of a blast furnace after normal conditions attain; adding 10-15kg of the magnesia per ton of iron, controlling the furnace temperature not lower than 1480 DEG C, and maintaining binary alkalinity of the furnace slag at 1.1-1.25; and normally tapping. The magnesia is jetted at the tuyere of the blast furnace, the temperature of the tuyere of the blast furnace is controlled not lower than 1480 DEG C, MgO melts soon, is absorbed by molten slag-iron settling in the area and is sent into the furnace slag so as to improve properties of the furnace slag and benefit direct operation of the blast furnace and quality of pig iron. In addition, ore high in Al2O3 content and low in cost can be used, so that ore blending cost is reduced greatly, and the economic benefit is evident.
Description
Technical field
The present invention relates to blast-furnace smelting, accuse particularly the Al in the blast-furnace slag processed
2O
3Content improves the method for Performance of Slag.
Background technology
In recent years because the increasing substantially of iron and steel production capacity, iron ore resource wretched insufficiency, the high Al that has to adopt in a large number of domestic a lot of steel mills
2O
3Ore is so that Al in the slag
2O
3Raise.Such as the Australiaironore of import, one of its maximum characteristics are Al
2O
3Composition is high, causes Al in the blast-furnace slag
2O
3Content brings up to 16%～17%, indivedual heat even reach more than 19%.Because Al in the slag
2O
3Increasing of content significantly increases the viscosity of slag, causes the maintaining blast furnace difficulty, shaft wall accretion occurs, and cupola well is inactive, slag iron difficulty goes out, and air port, two covers burn out, and the stokehold workload is very heavy, and the pig iron factor of merit descends, and the blast furnace air quantity reduces, and air-flow is unstable.Badly influence the stable smooth operation that blast furnace is produced, furnace processor is reduced, energy consumption rises, even causes furnace condition disorder.For Al in the present slag
2O
3The problem of content, in order to improve Performance of Slag, MgO content then is to solve Al in the slag in the employing increase slag
2O
3The optimal path of content.Because the MgO content in the magnesia is higher, be again ripe flux, therefore adding magnesia effect is very good in blast furnace.Through test, because magnesia is powdery, from present charging of shaft furnace mode, namely directly add magnesia from blast furnace roof, the ventilation property that then can produce the blast furnace stock column is poor, the stable smooth operation that is unfavorable for blast furnace, secondly the magnesia of powdery can be blown out from furnace roof by the Gas Flow of blast furnace high pressure and enter the stove dirt, and makes the Al in the slag
2O
3Reduction has little effect, and causes waste, can not guarantee that the direct motion of blast furnace reaches stable;
In order to solve Al in the slag
2O
3This problem of content also has and takes directly to add rhombspar, serpentine from blast furnace roof, but because these materials all contain a large amount of detrimental impurity, when improving the blast-furnace slag performance, also blast-furnace smelting produced a lot of unfavorable factors.
Summary of the invention
The object of the invention is to solve Al in the blast furnace slag that the high aluminium ore of present employing brings
2O
3Content is high and cause the slag fluidity can be poor, affects the deficiency of smooth operation of furnace, provides a kind of and can reduce Al in the blast furnace slag
2O
3Content guarantees that blast furnace strives the method for improving the blast-furnace slag performance of produce producing
Realize the measure of above-mentioned purpose:
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 10～15 kg/tonnes of iron, and the granularity of control magnesia≤0.075 millimeter, the control furnace temperature is not less than 1480 ℃, the dual alkalinity of slag is 1.1～1.25, and the quaternary basicity of slag is 0.95～0.98;
3) normally tap a blast furnace.
Owing to solve to adopt and contain the iron ore of aluminium sesquioxide to the blast furnace adverse effect, guarantee the direct motion of production, namely reduce the content of aluminium sesquioxide in the slag, improve the performance of slag, especially the problem of flowing property is found through lot of experiments, if the magnesia of powdery directly adds magnesia from blast furnace roof, at first can cause magnesia to cause the ventilation property of stock column in the blast furnace poor, be unfavorable for the stable smooth operation of blast furnace; Secondly magnesia can be blown out from furnace roof by the Gas Flow of elevated pressures in the blast furnace and enter the stove dirt, and it is large the magnesia consumption to occur, improves having little effect of Performance of Slag, and production cost is increased.Through test, employing is not less than 1480 ℃ at Blast Furnace Injection magnesia and the draught temperature of controlling blast furnace, and MgO absorbs with very fast fusing and by the slag iron liquid that this zone descends and enters slag, thereby improves Performance of Slag, and be beneficial to smooth operation of furnace and iron quality, and can also use relatively inexpensive high Al
2O
3The ore of content significantly reduces joins ore deposit cost, remarkable in economical benefits.
Embodiment
The below is described in detail the present invention:
Table 1 is the test-results tabulation of various embodiments of the present invention and Comparative Examples;
Embodiment 1
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 10 kg/tonnes of iron, and control magnesia granularity is at 0.073 millimeter, furnace temperature is at 1480～1485 ℃, the dual alkalinity of slag is 1.1, and the quaternary basicity of slag is 0.98;
3) normally tap a blast furnace.
Embodiment 2
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 12 kg/tonnes of iron, and control magnesia granularity is at 0.07 millimeter, furnace temperature is at 1490～1495 ℃, the dual alkalinity of slag is 1.18, and the quaternary basicity of slag is 0.95;
3) normally tap a blast furnace.
Embodiment 3
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 15 kg/tonnes of iron, and control magnesia granularity is at 0.071 millimeter, furnace temperature is at 1488～1493 ℃, the dual alkalinity of slag is 1.2, and the quaternary basicity of slag is 0.96;
3) normally tap a blast furnace.
Embodiment 4
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 13 kg/tonnes of iron, and control magnesia granularity is at 0.068 millimeter, furnace temperature is at 1483～1488 ℃, the dual alkalinity of slag is 1.25, and the quaternary basicity of slag is 0.98;
3) normally tap a blast furnace.
Embodiment 5
A kind of method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 14 kg/tonnes of iron, and control magnesia granularity is at 0.069 millimeter, furnace temperature is at 1493～1498 ℃, the dual alkalinity of slag is 1.15, and the quaternary basicity of slag is 0.97;
3) normally tap a blast furnace.
The test-results tabulation of various embodiments of the present invention and Comparative Examples
Annotate: Comparative Examples is situation about adding at high furnace roof.
As can be seen from Table 1, adopt MgO content (wt%) increase in the slag in the slag of the present invention, slag viscosity reduces, and Performance of Slag obviously improves, and is conducive to the blast furnace stable smooth operation, reduces fuel ratio, is conducive to simultaneously the blast furnace desulfurization, improves iron quality.
Above-described embodiment only exemplifies for the best, and is not to be restriction to embodiments of the present invention.
Claims (1)
1. method of improving the blast-furnace slag performance, its step:
1) is conventionally loaded into furnace charge, and begins to smelt;
2) after blast furnace enters standard state, to jet at blast-furnace tuyere behind the coal that be routinely added to and the magnesia mixing: magnesia adds according to 10～15 kg/tonnes of iron, and the granularity of control magnesia≤0.075 millimeter, the control furnace temperature is not less than 1480 ℃, the dual alkalinity of slag is 1.1～1.25, and the quaternary basicity of slag is 0.95～0.98;
3) normally tap a blast furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210376413.0A CN102864258B (en) | 2012-10-08 | 2012-10-08 | Method or improving properties of blast furnace slag |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210376413.0A CN102864258B (en) | 2012-10-08 | 2012-10-08 | Method or improving properties of blast furnace slag |
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| Publication Number | Publication Date |
|---|---|
| CN102864258A true CN102864258A (en) | 2013-01-09 |
| CN102864258B CN102864258B (en) | 2015-07-15 |
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|---|---|---|---|
| CN201210376413.0A Expired - Fee Related CN102864258B (en) | 2012-10-08 | 2012-10-08 | Method or improving properties of blast furnace slag |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278118A (en) * | 2014-10-24 | 2015-01-14 | 山东钢铁股份有限公司 | Method of using waste magnesia carbon bricks in blast furnace iron making to improve performances of blast-furnace slag |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
| 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 |
| 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 |
| WO2024066378A1 (en) * | 2022-09-29 | 2024-04-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Injection method for improving high-titanium slag property of vanadium-titanomagnetite smelting |
-
2012
- 2012-10-08 CN CN201210376413.0A patent/CN102864258B/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 秦学武等: "高炉高铝炉渣性能研究", 《山东冶金》 * |
| 陆隆文等: "武钢高炉用蛇纹石调剂炉渣MgO含量的生产实践", 《炼铁》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278118A (en) * | 2014-10-24 | 2015-01-14 | 山东钢铁股份有限公司 | Method of using waste magnesia carbon bricks in blast furnace iron making to improve performances of blast-furnace slag |
| CN106555020A (en) * | 2015-09-30 | 2017-04-05 | 上海梅山钢铁股份有限公司 | A kind of method for improving blast-furnace slag performance |
| 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 |
| WO2024066378A1 (en) * | 2022-09-29 | 2024-04-04 | 攀钢集团攀枝花钢铁研究院有限公司 | Injection method for improving high-titanium slag property of vanadium-titanomagnetite smelting |
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|---|---|
| CN102864258B (en) | 2015-07-15 |
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Effective date of registration: 20170711 Address after: 430083 Qingshan District, Hubei, Wuhan factory before the door No. 2 Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuhan, Hubei Friendship Road, No. 999, Wuchang Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20150715 Termination date: 20191008 |