CN107557517A - A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage - Google Patents
A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage Download PDFInfo
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- CN107557517A CN107557517A CN201710667204.4A CN201710667204A CN107557517A CN 107557517 A CN107557517 A CN 107557517A CN 201710667204 A CN201710667204 A CN 201710667204A CN 107557517 A CN107557517 A CN 107557517A
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Abstract
The invention discloses a kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, converter dust-removing ash and lime is added into ladle in vanadium extraction half steel tapping process, then the half steel for filling dedusting ash addition converter is made steel.The present invention, by adding suitable cold burden, and the control of rifle position, oxygen flow, realizes that semi-steel making dephosphorization rate early stage reaches more than 80% according to half steel phosphorus content and temperature.Dedusting ash iron content of the present invention is high：TFe：55~70%, FeO：20~35%, it disclosure satisfy that semi-steel dephosphorizing condition, it can be greatly reduced or substitute the materials such as machine burning ore deposit, iron scale completely, not only accomplish that resource secondary utilizes, and recovery rate of iron is effectively improved so as to reduce production cost, improving the dephosphorization efficiency of semi-steel making simultaneously and realizing makes converter reach less-slag operation, shorten smelting cycle, improve production capacity, while solves the problems, such as converter dust-removing ash resource reutilization.
Description
Technical field
The invention belongs to metallurgical technology field, and in particular to one kind utilizes converter dust-removing ash auxiliary semi-steel making dephosphorization early stage
Method.
Background technology
With the fast development of China's steel industry, converter dust-removing ash is as the derivative in process for making flow, at present
In China, comprehensive utilization ratio is relatively low, is generally used for stemming operation material and returns to sintering etc., remaining still to be abandoned as waste,
Continue to accumulate.But the value of converter dust-removing ash could not be given full play in above-mentioned application in terms of these, and there is serious disadvantage
End.Vanadium extraction by converter blowing makes steel duplex technique productions, through the constituent content vestige such as silicon, manganese in semi-steel after extraction of vanadium, therefore in steelmaking process
The clinker constituent element of formation is single, and converter slagging speed is slow, and the metallurgical performance of clinker is poor, semi-steel making dephosphorization outstanding problem, at present
Semi-steel after extraction of vanadium steel-making relies primarily on irony slagging route, and converter dust-removing ash has very high ferrous oxide content, main component W
(CaO)：12~26%；W(SiO2)：1~4%；W(FeO)：20~35%；W(TFe)：55~70%, 99% granularity ＜ 0.1mm, it is half
Steel steel-making early stage dephosphorization a kind of oxidant, using converter dust-removing ash as semi-steel making Dephosphorising agent can significantly reduce dephosphorization into
This, maximum economic benefit and environmental benefit are obtained with minimum cost.
The content of the invention
The technical problems to be solved by the invention are to provide one kind using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage
Method；The present invention improves semi-steel dephosphorizing effect, solves converter dust-removing ash emission problem, accomplishes the secondary use of resource,
Reduce process consumption.
In order to solve the above technical problems, the technical solution used in the present invention is：One kind utilizes converter dust-removing ash auxiliary half
The method of steel steel-making dephosphorization early stage, converter dust-removing ash and lime are added into ladle in vanadium extraction half steel tapping process, utilizes half steel
Dedusting ash and lime are carried out fritting by tapping process dynamic conditions, then the half steel for filling dedusting ash addition converter is refined
Steel, P content≤0.150% before the semi-steel dephosphorizing.
Half steel C >=3.7% of the present invention, half steel tapping temperature are 1350~1420 DEG C.
Half steel tapping process converter dust-removing ash and active lime of the present invention press 2:1 amount adds, and total addition is 12-
15kg/t steel.
Converter dust-removing ash TFe of the present invention：55~70%, FeO：20~35%.
The present invention is controlled in 80-100kg/t steel according to half steel condition, adding amount of scrap steel.
Dephosphorizing process mid-early stage rifle position of the present invention is controlled in 1.4-1.6m, and oxygen flux control is in 18000-20000m3/ h,
Early stage, active lime addition 10-15kg/t steel, light dolomite addition 5-6kg/t steel, made full use of molten bath early stage to be in
The advantage of low temperature, most of phosphorus in molten steel is removed in early stage as far as possible.
Dephosphorizing process mid-early stage of the present invention, oxygen-supplying amount control is for 18-20m3During/t steel, early stage, clinker dephosphorization rate was more than
80%, required afterwards according to steel grade P, if carry out double slag operation.
The principles of science of foundation of the present invention：
Using converter dust-removing ash auxiliary semi-steel dephosphorizing pretreating process, half steel tapping temperature is controlled at 1350~1420 DEG C, driven
Mechanical condition is analyzed, and half steel tapping process utilizes the ballistic work of steel stream, and the dedusting ash added in ladle, lime are melted in advance,
Reach molten condition, increase the activity of clinker；Analyzed from thermodynamic condition, one side favors low temperature is unfavorable in dephosphorisation reaction
Decarburizing reaction, with the presence of a large amount of carbon in another aspect half steel, due to interaction of the carbon phosphorus in half steel, put forward the activity of phosphorus
Height, further increases dephosphorization tendency, and dephosphorization condition is more superior than liquid steel dephosphorization.In order to can successfully be carried out in half steel oxidizing process
Dephosphorization, it is necessary to addition and P2O5The very strong basic anhydride active lime of binding ability, it is allowed to the stable phosphate of generation and effectively enters
Row dephosphorization, to improve the mobility of dephosphorized slag and respond.Dephosphorisation reaction is：
2 [P]+5 (FeO)+3 (CaO)=3 (CaO) P2O5+5[Fe]
2 [P]+5 (FeO)+4 (CaO)=4 (CaO) P2O5+5[Fe]
Under oxidative conditions, basic clinker dephosphorisation reaction is：
[P]+3/2O2+ 5/2 [O]=PO43-
Learnt by reaction equation, active lime adds the basicity of dephosphorized slag, and injecting oxygen increases dephosphorization with adding dedusting ashes
The oxidisability of slag, dephosphorisation reaction are exothermic reaction, and half steel provides low temperature environment for dephosphorized slag, suppress temperature by adding steel scrap
Steeply rise.
It is using beneficial effect caused by above-mentioned technical proposal：1st, the dedusting ash cost that this hair uses is low, iron content
It is high：TFe：55~70%, FeO:20~35%, semi-steel dephosphorizing condition is disclosure satisfy that, can be greatly reduced or substitute machine burning completely
Ore deposit, iron scale etc., not only accomplish that resource secondary utilizes, and effectively improve recovery rate of iron so as to reduce production cost.2、
Dephosphorization rate of the present invention reaches more than 80%.3rd, dephosphorization dedusting ash converter early stage of the present invention can replace 70-100% machine burning ore deposit, oxygen
Change the materials such as iron sheet, and positive effect.
Embodiment
With reference to specific embodiment, the present invention is further detailed explanation.
Embodiment 1
A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, carry rear half steel tapping process and add dedusting ash
8kg/t steel, active lime 4.0kg/t steel, half steel tapping temperature are 1350 DEG C, half steel condition C：3.76%, P：0.150%, it is described
Dedusting ash component TFe：60%, FeO：20%, adding amount of scrap steel is 80kg/t steel.
Dephosphorizing process mid-early stage active lime addition 10kg/t steel, light dolomite 6kg/t steel, early stage, rifle position was
1.6m, oxygen flow 19000m3/ h, oxygen-supplying amount 19m3During/t steel, sampling, molten steel phosphorus is 0.026%, and early stage, dephosphorization rate was
82.67%。
Embodiment 2
A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, carry rear half steel tapping process and add dedusting ash
9kg/t steel, active lime 4.5kg/t steel, half steel tapping temperature are 1370 DEG C, half steel condition C：3.70%, P：0.148%, it is described
Dedusting ash component TFe：55%, FeO：25%, adding amount of scrap steel is 80kg/t steel.
Dephosphorizing process mid-early stage active lime addition 15kg/t steel, light dolomite 6kg/t steel, early stage, rifle position was
1.5m, oxygen flow 18000m3/ h, oxygen-supplying amount 20m3During/t steel, sampling, molten steel phosphorus is 0.025%, and early stage, dephosphorization rate was
83.11%。
Embodiment 3
A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, carry rear half steel tapping process and add dedusting ash
10kg/t steel, active lime 5.0kg/t steel, half steel tapping temperature are 1400 DEG C, half steel condition C：3.86%, P：0.130%, it is described
Dedusting ash component TFe：60%, FeO：20%, adding amount of scrap steel is 100kg/t steel.
Dephosphorizing process mid-early stage active lime addition 12kg/t steel, light dolomite 5.5kg/t steel, early stage, rifle position was
1.6m, oxygen flow 20000m3/ h, oxygen-supplying amount 18m3During/t steel, sampling, molten steel phosphorus is 0.025%, and early stage, dephosphorization rate was
80.8%。
Embodiment 4
A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, carry rear half steel tapping process and add dedusting ash
10kg/t steel, active lime 5.0kg/t steel, half steel tapping temperature are 1420 DEG C, half steel condition C：3.9%, P：0.135%, it is described
Dedusting ash component TFe：70%, FeO：35%, adding amount of scrap steel is 100kg/t steel.
Dephosphorizing process mid-early stage active lime addition 13kg/t steel, light dolomite 5kg/t steel, early stage, rifle position was
1.4m, oxygen flow 20000m3/ h, oxygen-supplying amount 19m3During/t steel, sampling, molten steel phosphorus is 0.026%, and early stage, dephosphorization rate was
80.7%。
Above example is only to illustrative and not limiting technical scheme, although with reference to above-described embodiment to this hair
It is bright to be described in detail, it will be understood by those within the art that：Still the present invention can be modified or be waited
With replacing, any modification or partial replacement without departing from the spirit and scope of the present invention, it all should cover the power in the present invention
Among sharp claimed range.
Claims (8)
- A kind of 1. method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage, it is characterised in that tapped in vanadium extraction half steel Process adds converter dust-removing ash and lime into ladle, is carried out dedusting ash and lime using half steel tapping process dynamic conditions Fritting, then the half steel for filling dedusting ash addition converter is made steel, P content≤0.150% before the semi-steel dephosphorizing.
- 2. a kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1, its feature It is, half steel C >=3.7%, half steel tapping temperature is 1350~1420 DEG C.
- 3. a kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1, its feature It is, half steel tapping process converter dust-removing ash and active lime press 2:1 amount adds, and total addition is 12-15kg/t steel.
- 4. a kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1, its feature It is, converter dust-removing ash TFe：55~70%, FeO：20~35%.
- A kind of 5. side using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1-4 any one Method, it is characterised in that adding amount of scrap steel is controlled in 80-100kg/t steel.
- A kind of 6. side using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1-4 any one Method, it is characterised in that dephosphorizing process mid-early stage rifle position is controlled in 1.4-1.6m, and oxygen flux control is in 18000-20000m3/h。
- A kind of 7. side using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1-4 any one Method, it is characterised in that dephosphorizing process mid-early stage active lime addition 10-15kg/t steel, light dolomite addition 5-6kg/t Steel.
- A kind of 8. side using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage according to claim 1-4 any one Method, it is characterised in that dephosphorizing process mid-early stage, oxygen-supplying amount are controlled in 18-20m3During/t steel, early stage, clinker dephosphorization rate was more than 80%。
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110819755A (en) * | 2019-12-25 | 2020-02-21 | 承德建龙特殊钢有限公司 | Method for desulfurization during vanadium extraction and tapping of converter |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
| CN113337673A (en) * | 2021-04-21 | 2021-09-03 | 新疆八一钢铁股份有限公司 | Preparation method of converter steelmaking efficient dephosphorization agent |
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| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
| CN106282475A (en) * | 2016-09-18 | 2017-01-04 | 河钢股份有限公司承德分公司 | A kind of method efficiently utilizing converter dust-removing ash |
| CN106591540A (en) * | 2016-12-20 | 2017-04-26 | 河钢股份有限公司承德分公司 | Semi-steel dephosphorization agent and semi-steel dephosphorization method |
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Patent Citations (4)
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| CN103088186A (en) * | 2013-03-07 | 2013-05-08 | 河北钢铁股份有限公司承德分公司 | Slag-making method for rapid dephosphorization of semisteel |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110819755A (en) * | 2019-12-25 | 2020-02-21 | 承德建龙特殊钢有限公司 | Method for desulfurization during vanadium extraction and tapping of converter |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
| CN113337673A (en) * | 2021-04-21 | 2021-09-03 | 新疆八一钢铁股份有限公司 | Preparation method of converter steelmaking efficient dephosphorization agent |
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