CN103114168A - Method for removing residual steel slag at converter bottom - Google Patents
Method for removing residual steel slag at converter bottom Download PDFInfo
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- CN103114168A CN103114168A CN2013100608648A CN201310060864A CN103114168A CN 103114168 A CN103114168 A CN 103114168A CN 2013100608648 A CN2013100608648 A CN 2013100608648A CN 201310060864 A CN201310060864 A CN 201310060864A CN 103114168 A CN103114168 A CN 103114168A
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Abstract
The invention relates to a method for removing residual steel slag at the converter bottom. The method comprises the following steps: 1) adding 30-70kg of silicon-calcium-barium alloys to a converter when the residual steel slag at the converter bottom is 300-400mm in depth; 2) after adding the silicon-calcium-barium alloys, shaking the converter to the normal working position and then controlling the distance between an oxygen lance nozzle and the converter bottom to be 1.2-2m and blowing oxygen for 50-70s under the oxygen pressure of 0.8-1.1Mpa; and 3) finishing oxygen blowing and carrying out deslagging, then shaking the converter to be normal and beginning a new round of smelting. The method has the advantages that the residual steel slag at the converter bottom can be quickly removed, thus avoiding rising at the converter bottom, ensuring an appropriate volume-capacity ratio, reducing splash and ensuring the stability and effect of smelting in the converter.
Description
Technical field
The present invention relates to field of steel-making, particularly, the present invention relates to the removing method of the residual slag of a kind of converter bottom.
Background technology
Along with the development of converter steelmaking process, the rhythm of production of converter is greatly improved, and the application of Technology of Slag Splashingfor Furnace Maintenance also provides technical support for the raising in furnace wall life-span.The slag that is used for slag splashing requires to have high-melting-point and full-bodied characteristics, in order to can stick to the erosion that reduces the furnace wall on the furnace wall, plays the effect of protection furnace wall.And this high-melting-point, full-bodied slag are not all to stick on the furnace wall of converter, and have quite a few to remain in converter bottom (as shown in Figure 1) after slag splashing.Fig. 2 is the design sketch of residue shown in Fig. 1 after deslagging is processed, and can be clear that this residual slag from Fig. 2, also is difficult for pouring out from converter, along with the accumulation of converter bottom slag, will cause Converter Bottom Rising in the course of time.The rise of converter bottom, gesture has affected the useful capacity of converter than causing reducing of converter heat size ratio, reduces the tap of converter; The generation that reduces also can cause splash of heat size ratio is unfavorable for the stable smooth operation of converter steelmaking also having aggravated simultaneously the erosion of the anti-material of converter mouth, affects the life-span of furnace wall.In addition, top and bottom combined blown converter has been the main flow type of furnace of current steel-making, and the accumulation of furnace bottom slag, will certainly affect the bottom blowing effect of top and bottom combined blown converter, be unfavorable for the even control of temperature and composition in converter steelmaking process, and then affect the metallurgical effect of converter steelmaking.
At present, the removing method of the residual slag of converter bottom is mainly after slag splashing, the residual slag of furnace bottom to be carried out the deslagging operation, and it is poured out from stove.Because the slag after slag splashing is more sticking, only rely on the deslagging operation, the slag of removing is very limited, just can find out from the contrast of Fig. 1 and Fig. 2.Still can not effectively remove slag after deslagging in the situation that furnace bottom rising is serious, also need auxiliary oxygen blast to carry out slag and remove, but it be slow to blow merely oxidation sludge, remove effect also not obvious, therefore, be badly in need of the effective removing method of the exploitation residual slag of a kind of converter bottom.
Summary of the invention
The object of the invention is to, the removing method of the residual slag of a kind of converter bottom is provided, the method can be removed the residual slag of converter bottom fast, avoids furnace bottom rising, guarantees suitable heat size ratio, reduces splash, guarantees stability and the metallurgical effect of converter smelting.
For achieving the above object, the present invention has adopted following technical scheme:
The removing method of the residual slag of a kind of converter bottom, described method comprises the steps:
1) during the residual 300～400mm of converter bottom slag, add the calsibar alloy of 30～70kg in the stove;
2) add calsibar alloy after, converter is shaken to normal operation position, the distance of then controlling oxygen lance blow head and converter bottom is 1.2～2m, carries out oxygen blast, oxygen pressure is 0.8～1.1Mpa, oxygen blow duration is 50～70 seconds;
3) oxygen blast finishes and deslagging, then converter is just shaken, and begins the smelting of a new stove.
The composition of described calsibar alloy is (by mass percentage): 46%～56% Si, 11%～14% Ca, 12%～16% Ba, 0.2%～0.6% C, 0.01%～0.03% P, 0.04%～0.12% S, 1.2%～1.6% Al, all the other are Fe element or impurity.Satisfying under the condition of this composition range, can use the trade mark to be FeBa
13Ca
12Si
5Calsibar alloy Deng the trade mark.Consider simultaneously the controllability of add-on, and the factor such as handled easily, preferably use the alloy of pouch encapsulation, every bag of weight is 10kg or 5kg.
During the residual 360mm of described converter bottom slag, add the calsibar alloy of 50kg in the stove.
The distance of described oxygen lance blow head and converter bottom is preferably 1.5m or 1.55m.
Described oxygen pressure is preferably 0.9MPa or 1MPa.
Described oxygen blow duration is preferably 59 seconds or 63 seconds.
After application of the present invention is splashing slag in converter opportunity, add calsibar alloy in converter, oxygen lance spraying is blown the rifle potential drop to lower limit, compress into capable oxygen blast heating residue adjustment, change slag with certain oxygen, improve the mobility of slag, at last converter is shaken to fire door down, the residual slag of converter bottom is poured out from converter mouth.
In the present invention, the add-on of calsibar alloy is 30～70kg, the mode that adds can be for manually adding from fire door, concrete operations are: after slag splashing, with converter shake flat to fire door backwards, manually throw away calsibar alloy into converter bottom this moment, after adding alloy, converter is shaken to the normal operation position, and carry out the oxygen blast operation.
The present invention has advantages of as follows with respect to prior art: the present invention adopts and adds calsibar alloy to assist oxygen blown method, can Fast Slag Melting, reduce the viscosity of slag, improve the mobility of slag, and then the residual slag of furnace bottom can be poured out from fire door, and avoid furnace bottom rising, guarantee suitable heat size ratio, do not affect converter rhythm of production and efficient, do not affect the work-ing life of furnace wall.Simultaneously, the present invention can not increase any device, not change under the prerequisite that has operating procedure now and realize.
Description of drawings
Fig. 1 is the thickness of the residual slag of slag splashing rear converter furnace bottom;
Fig. 2 is the thickness of slag splashing and the residual slag of deslagging rear converter furnace bottom;
Fig. 3 is working state schematic representation of the present invention;
Fig. 4 is for implementing the thickness of the residual slag of rear converter furnace bottom of the present invention;
Wherein: 1, oxygen rifle; 2, furnace bottom; 3, the residual slag of furnace bottom; 4, calsibar alloy; 5, oxygen.
Embodiment
The present invention is further detailed explanation with the drawings and specific embodiments for the below.
The removing method of the residual slag of a kind of converter bottom, described method comprises the steps:
1) during the residual 300～400mm of converter bottom slag, add the calsibar alloy of 30～70kg in the stove;
2) add calsibar alloy after, converter is shaken to normal operation position, the distance of then controlling oxygen lance blow head and converter bottom is 1.2～2m, carries out oxygen blast, oxygen pressure is 0.8～1.1Mpa, oxygen blow duration is 50～70 seconds;
3) oxygen blast finishes and deslagging, then converter is just shaken, and begins the smelting of a new stove.
As shown in Figure 3, when calsibar alloy added converter and carries out oxygen blast, the residual slag of converter bottom began to melt, and mobility increases, and easily pours out from fire door.
At furnace bottom rising 300mm, be in the situation of the residual 300mm of converter bottom slag, after slag splashing, converter is shaken after the stove flat, by manually adding the 40kg calsibar alloy in converter, alloying constituent (by mass percentage) is: 52.14% Si, 12.7% Ca, 14.05% Ba, 0.28% C, 0.024% P, 0.06% S, 1.45% Al, all the other are Fe element and inevitable impurity.Oxygen lance blow head is controlled to be oxygen lance blow head apart from furnace bottom 1.5m apart from the distance of furnace bottom, and oxygen is pressed and is 0.9Mpa, oxygen blast 59 seconds, and removing the residual slag of furnace bottom is 180mm, clearance is 60%.
At furnace bottom rising 360mm, be in the situation of the residual 360mm of converter bottom slag, after slag splashing, converter is shaken after the stove flat, by manually adding the calsibar alloy of 50kg in the converter, alloying constituent (by mass percentage) is: 54.1% Si, 13.1% Ca, 15.0% Ba, 0.40% C, 0.02% P, 0.09% S, 1.38% Al, all the other are Fe element and inevitable impurity.Oxygen lance blow head is controlled to be oxygen lance blow head apart from furnace bottom 1.55m apart from the distance of furnace bottom, and oxygen is pressed and is 1.0Mpa, and the residual slag 240mm of furnace bottom is removed in oxygen blast 63 seconds, and clearance is 66.7%.
At furnace bottom rising 400mm, be in the situation of the residual 400mm of converter bottom slag, after slag splashing, converter is shaken after the stove flat, by manually adding the calsibar alloy of 70kg in the converter, alloying constituent (by mass percentage) is: 55.8% Si, 13.9% Ca, 16.0% Ba, 0.60% C, 0.03% P, 0.12% S, 1.59% Al, all the other are Fe element and inevitable impurity.Oxygen lance blow head is controlled to be oxygen lance blow head apart from furnace bottom 2m apart from the distance of furnace bottom, and oxygen is pressed and is 1.1Mpa, and the residual slag 280mm of furnace bottom is removed in oxygen blast 70 seconds, and clearance is 70.0%.
Embodiment 4
At furnace bottom rising 300mm, be in the situation of the residual 300mm of converter bottom slag, after slag splashing, converter is shaken after the stove flat, by manually adding the calsibar alloy of 30kg in the converter, alloying constituent (by mass percentage) is: 46.8% Si, 11.1% Ca, 12.0% Ba, 0.20% C, 0.01% P, 0.04% S, 1.23% Al, all the other are Fe element and inevitable impurity.Oxygen lance blow head is controlled to be oxygen lance blow head apart from furnace bottom 1.2m apart from the distance of furnace bottom, and oxygen is pressed and is 0.8Mpa, and the residual slag 200mm of furnace bottom is removed in oxygen blast 50 seconds, and clearance is 66.7%.
Comparative Examples 1
Traditional smelting process, in the situation that Converter Bottom Rising 300～400mm, after slag splashing, deslagging only can be poured out 10～60mm, and clearance is only 2.5%～20%, and furnace bottom will constantly accumulate rise like this, be unfavorable for the heat size ratio that keeps suitable also being unfavorable for the stable smelting of converter.
The present invention can slag situation residual according to furnace bottom and furnace bottom rising situation, determines to implement the opportunity of present method.If furnace bottom only has a small amount of slag residual, just needn't adopt present method, if furnace bottom rising is to a certain extent, just can smelting the gap, adopt present method after splashing slag in converter.Can effectively control converter bottom like this, guarantee that suitable stove melts ratio, for the stable smooth operation of smelting provides favourable condition, and can avoid excessively removing the residual slag of furnace bottom and cause the furnace bottom attenuation.
In addition, the amount of the calsibar alloy that adds in the present invention is also few, and is not all will adopt present method after every stove is smelted, thereby the present invention has adopted the method that manually adds calsibar alloy, so just needn't take high hopper, not affect the normal use of converter high hopper.And the calsibar alloy that adds of the present invention can be that 5kg dress and 10kg fill, and can control more accurately like this add-on of Si-Ca-Ba, avoids extensive operation.
As shown in Figure 4, the performance at scene according to the present invention, in the situation that furnace bottom rising 300～400mm, adopt present method, once can effectively remove the residual slag 200mm of furnace bottom left and right, namely make the furnace bottom decline 200mm left and right of rise, smelting Connexin employing present method, the furnace bottom rising situation is controlled in the reasonable scope.
After method of the present invention was used, the clearance of the residual slag of furnace bottom can reach more than 50%, and the clearance than traditional 2.5%～20% has significantly and improves.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although with reference to embodiment, the present invention is had been described in detail, will be understood by those skilled in the art that, technical scheme of the present invention is modified or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (6)
1. the removing method of the residual slag of converter bottom, described method comprises the steps:
1) during the residual 300～400mm of converter bottom slag, add the calsibar alloy of 30～70kg in the stove;
2) add calsibar alloy after, converter is shaken to normal operation position, the distance of then controlling oxygen lance blow head and converter bottom is 1.2～2m, carries out oxygen blast, oxygen pressure is 0.8～1.1Mpa, oxygen blow duration is 50～70 seconds;
3) oxygen blast finishes and deslagging, then converter is just shaken, and begins the smelting of a new stove.
2. the removing method of the residual slag of a kind of converter bottom according to claim 1, it is characterized in that, by percentage to the quality, the composition of described calsibar alloy is: 46%～56% Si, 11%～14% Ca, 12%～16% Ba, 0.2%～0.6% C, 0.01%～0.03% P, 0.04%～0.12% S, 1.2%～1.6% Al, all the other are Fe or impurity.
3. the removing method of the residual slag of a kind of converter bottom according to claim 1 and 2, is characterized in that, during the residual 360mm of described converter bottom slag, adds the calsibar alloy of 50kg in the stove.
4. the removing method of the residual slag of a kind of converter bottom according to claim 1 and 2, is characterized in that, the distance of described oxygen lance blow head and converter bottom is 1.5m or 1.55m.
5. the removing method of the residual slag of a kind of converter bottom according to claim 1 and 2, is characterized in that, described oxygen pressure is 0.9MPa or 1MPa.
6. the removing method of the residual slag of a kind of converter bottom according to claim 1 and 2, is characterized in that, described oxygen blow duration is 59 seconds or 63 seconds.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310060864.8A CN103114168B (en) | 2013-02-26 | 2013-02-26 | Method for removing residual steel slag at converter bottom |
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| CN201310060864.8A CN103114168B (en) | 2013-02-26 | 2013-02-26 | Method for removing residual steel slag at converter bottom |
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| CN103114168A true CN103114168A (en) | 2013-05-22 |
| CN103114168B CN103114168B (en) | 2014-12-31 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083469A (en) * | 2017-05-09 | 2017-08-22 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing steelmaking converter furnace bottom |
| CN112725559A (en) * | 2020-12-17 | 2021-04-30 | 安徽长江钢铁股份有限公司 | Method for efficiently removing slag splashing layer at joint of bottom and body of converter with movable furnace bottom |
Citations (1)
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| CN101619374A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Method for controlling furnace bottom by adding ferro-silicon |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101619374A (en) * | 2008-06-30 | 2010-01-06 | 鞍钢股份有限公司 | Method for controlling furnace bottom by adding ferro-silicon |
Non-Patent Citations (3)
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| 乐可襄等: "钢水化学加热法硅发热剂的应用", 《钢铁研究学报》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107083469A (en) * | 2017-05-09 | 2017-08-22 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing steelmaking converter furnace bottom |
| CN112725559A (en) * | 2020-12-17 | 2021-04-30 | 安徽长江钢铁股份有限公司 | Method for efficiently removing slag splashing layer at joint of bottom and body of converter with movable furnace bottom |
| CN112725559B (en) * | 2020-12-17 | 2022-02-18 | 安徽长江钢铁股份有限公司 | Method for efficiently removing slag splashing layer at joint of bottom and body of converter with movable furnace bottom |
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Granted publication date: 20141231 Termination date: 20160226 |