CN103451369B - A kind of method that the ANS-OB of utilization refining furnace carries out dephosphorization of molten iron - Google Patents
A kind of method that the ANS-OB of utilization refining furnace carries out dephosphorization of molten iron Download PDFInfo
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- CN103451369B CN103451369B CN201310386043.3A CN201310386043A CN103451369B CN 103451369 B CN103451369 B CN 103451369B CN 201310386043 A CN201310386043 A CN 201310386043A CN 103451369 B CN103451369 B CN 103451369B
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- dephosphorization
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- slag
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Abstract
The present invention relates to a kind of method that the ANS of utilization OB refining furnace carries out dephosphorization of molten iron, specifically include following steps: use dephosphorization hot-metal bottle, the position that is transported to molten iron to skim carries out taking off Slag treatment, and molten iron is carried out thermometric sampling；Molten iron is transported to ANS OB refining furnace station, is first turned on bottom blown gas valve and carries out stirring of blowing；Point 13 batches of addition slag materials in tank, it is 20 50kg/t that slag material adds total amount；The spray gun above ANS OB refining furnace impregnating cover is utilized to be blown into oxygen or air；After dephosphorization treatment completes, molten iron is taken off Slag treatment, carry out thermometric sampling, carry out next procedure.The invention have the advantage that and achieve in the case of not increasing equipment investment, utilize factory's original refining furnace that molten iron is carried out dephosphorization, saved substantial amounts of equipment investment cost and place area occupied.
Description
Technical field
The invention belongs to hot metal in steelmaking preconditioning technique field, particularly relate to one and utilize ANS-OB refine
Stove carries out the method for dephosphorization of molten iron.
Background technology
Phosphorus is typically harmful element in steel, because phosphorus is easily at cyrystal boundary segregation, causes the cold short of steel
, the segregation of phosphorus also can cause the anisotropy of steel, reduces welding performance, causes stainless corruption
Erosion fatigue, therefore major part steel grade is desirable that reduction phosphorus content.In recent years, raw along with clean steel
Developing rapidly of production. art, it is proposed that the demand to Low-phosphorus Steel, as produced automobile Surface hardened layer
Superior alloy steel, deep punching steel, tin plate, ultra-low-carbon steel, bearing steel, high-grade pipe line steel,
The steel grade such as cryogenic steel and marine steel requires that in steel, w (P) is less than 0.01%.Therefore, how
Stably efficiently control the bottleneck place during the content of foreign matter of phosphor element is steel mill's smelting process in steel
。
Current most of steel mill generally uses when producing Low-phosphorus Steel, " duplex practice " or " double slag process "
." duplex practice " uses twice slag making, such as document the most respectively in dephosphorization converter and decarburization converter
1(" converter duplex method smelting process and feature thereof ", Sun Liming, Shanghai Metals, volume 27
2 phases, the 44-46 page), disclose converter duplex technique and feature." double slag process " is i.e. same
Using twice slag making in smelting in one converter, such as document 2(, " combined blown converter double slag process produces low-phosphorous
Steel process practice ", Wang Haibao etc., Sichuan is metallurgical, the 4th phase of volume 30, the 29-31 page),
Disclose the process characteristic of the double slag melting of converter.The deficiency of both approaches is complex process,
The duration of heat is long, and converter producing rate can not be not fully exerted.Also having a kind of mode is to converter
Molten iron carries out dephosphorization treatment in advance, such as document 3(" dephosphorization of molten iron industrial analysis research ", Zhang Fei
Tiger etc., industry heating, the 4th phase of volume 41, the 55-51 page), disclose domestic " Taiyuan Iron and Steel Co. "
Establish molten iron " three de-stations " and molten iron is carried out dephosphorization, desiliconization, desulfurization process.It is not enough
Being need to be many with equipment, investment be big, complex process, heat waste are big.Therefore, low in order to produce these
Phosphorus, ultra-low phosphoretic steel, conventional smelting process can not meet the requirement to phosphorus of these steel grades.
The ultimate principle of ANS-OB refining furnace is under conditions of ladle bottom blowing hydrogen stirring molten steel, in leaching
Complete the operations such as the deoxidation of molten steel, alloying and intensification inside stain cover, solve tradition Argon
Stirring causes the Molten Steel over-oxidation problem that molten steel is exposed, slag causes, at molten steel heating, alloy
Change and removal of inclusions aspect has unique advantage.
Summary of the invention
For overcoming the deficiencies in the prior art, it is an object of the invention to provide one and utilize ANS-OB refining furnace
Carry out dephosphorization of molten iron
Method, it is achieved dephosphorization of molten iron, technique is simple, saves equipment investment cost.
For achieving the above object, the present invention is achieved through the following technical solutions:
A kind of method that the ANS-OB of utilization refining furnace carries out dephosphorization of molten iron, specifically includes following steps:
1) use dephosphorization hot-metal bottle, molten iron is transported to position of skimming, first molten iron is taken off Slag treatment, take off
After slag completes, molten iron is carried out thermometric sampling, detect phosphorus content；
2) molten iron is transported to ANS-OB refining furnace station, is first turned on bottom blown gas valve and carries out air blowing and stir
Mixing, gas flow is 5-6 Nm3/h∙t；In tank, a point 1-3 criticizes addition slag material, and slag material adds
Entering total amount is 20-50kg/t；
3) spray gun above ANS-OB refining furnace impregnating cover is utilized to be blown into oxygen or air, gas flow control
System is at 5-10Nm3/h∙t；
4), after dephosphorization treatment completes, owing to slag blanket is thicker, molten iron is taken off Slag treatment；
5) after having skimmed, carry out thermometric sampling, detect phosphorus content.
Step 2) described in slag material be CaO, iron oxides, dolomite, CaF2Mixture, wherein
Each constituent mass percentage ratio is CaO 35-55%, iron oxides 20-35%, dolomite 8-1
5%, CaF2 5-15%。
Step 2) described in bottom blown gas be argon or nitrogen.
Compared with prior art, the invention has the beneficial effects as follows:
Achieve in the case of not increasing equipment investment, utilize factory's original refining furnace that molten iron is carried out
Dephosphorization, has saved substantial amounts of equipment investment cost and place area occupied.Simultaneously without employing
The complicated technology such as " duplex practice " or " double slag process " carries out dephosphorization in stove.Therefore the reality of the present invention
Execute and can save large number quipments input cost and avoid the operational process of craft of complexity, it is achieved low one-tenth
This dephosphorization of molten iron.
Detailed description of the invention
Below the present invention is described in detail, it should be noted that the enforcement of the present invention be not limited to
Under embodiment.
A kind of method that the ANS-OB of utilization refining furnace carries out dephosphorization of molten iron, specifically includes following steps:
1) use dephosphorization hot-metal bottle, molten iron is transported to position of skimming, first molten iron is taken off Slag treatment, take off
After slag completes, molten iron is carried out thermometric sampling；
2) molten iron is transported to ANS-OB refining furnace station, is first turned on bottom blown gas valve and carries out air blowing and stir
Mixing, gas flow is 5-6 Nm3/ h t is advisable not producing splash；In tank, a point 1-3 criticizes addition
Slag material, it is 20-50kg/t that slag material adds total amount；
3) spray gun above ANS-OB refining furnace impregnating cover is utilized to be blown into oxygen or air, gas flow control
System is at 5-10Nm3/h∙t；
4), after dephosphorization treatment completes, owing to slag blanket is thicker, molten iron is taken off Slag treatment；
5) after having skimmed, carry out thermometric sampling, with overhead traveling crane, qualified molten iron is winched to next process.
Described slag material is CaO, iron oxides, dolomite, CaF2Mixture, the most each component matter
Amount percentage ratio is CaO 35-55%, iron oxides 20-35%, dolomite 8-15%, CaF2
5-15%。
Described bottom blown gas can be argon or nitrogen.
Embodiment 1:
ANS-OB refining furnace is utilized to carry out dephosphorization of molten iron process:
1) use dephosphorization Special iron water pot, molten iron is transported to position of skimming, first molten iron is taken off Slag treatment
.After having skimmed, molten iron carrying out thermometric sampling, actual measurement molten iron temperature is 1320 DEG C, and phosphorus contains
Amount is 0.065%.
2) molten iron is transported to ANS-OB refining furnace station, is first turned on bottom blown gas valve and carries out blowing argon gas
Stirring.Then point 2 batches of addition slag materials in tank, it is 25kg/t ferrum that slag material adds total amount.Slag making
In material, each constituent content is (Wt%), CaO:45%；Iron oxides: 30%；Dolomite: 12
%；CaF2:13%.
3) utilizing the spray gun above ANS-OB refining furnace impregnating cover to be blown into oxygen, gas flow controls 6
Nm3/h∙t。
4), after dephosphorization treatment completes, molten iron is taken off Slag treatment.
5) after having skimmed, carrying out thermometric sampling, actual measurement molten iron temperature is 1347 DEG C, and phosphorus content is 0
.0078%.With overhead traveling crane, qualified molten iron is winched to next process.
Seen from result, not only dephosphorization effect is obvious, and molten iron temperature does not declines rising 27 DEG C on the contrary.Real
Molten iron temperature loss is turn avoid while existing dephosphorization.
Embodiment 2:
ANS-OB refining furnace is utilized to carry out dephosphorization of molten iron process:
1) use dephosphorization Special iron water pot, molten iron is transported to position of skimming, first molten iron is taken off Slag treatment
.After having skimmed, molten iron is carried out thermometric sampling.Actual measurement molten iron temperature is 1301 DEG C, and phosphorus contains
Amount is 0.091%.
2) molten iron is transported to ANS-OB refining furnace station, is first turned on bottom blown gas valve and carries out nitrogen blowing
Stirring.Then point 3 batches of addition slag materials in tank, it is 40kg/t ferrum that slag material adds total amount.Slag making
In material, each constituent content is (Wt%), CaO:52%；Iron oxides: 25%；Dolomite: 14
%；CaF2:9%.
3) utilizing the spray gun above ANS-OB refining furnace impregnating cover to be blown into air, gas flow controls 1
0Nm3/h∙t。
4), after dephosphorization treatment completes, molten iron is taken off Slag treatment.
5) after having skimmed, carrying out thermometric sampling, actual measurement molten iron temperature is 1309 DEG C, and phosphorus content is 0
.0088%.With overhead traveling crane, qualified molten iron is winched to next process.
Seen from result, not only dephosphorization effect is obvious, and molten iron temperature does not declines rising 8 DEG C on the contrary.Realize
Molten iron temperature loss is turn avoid while dephosphorization.
ANS-OB refining furnace is typically to carry out molten steel the equipment of refine, due to its have bottom blowing stirring,
The feature of top blast oxygen, can apply existing ANS-OB refining furnace to carry out molten iron the most completely
Dephosphorization treatment.Avoid building molten iron " three de-stations " and dephosphorization of molten iron can be realized, simultaneously without adopting
Dephosphorization is carried out with the complicated technology such as " duplex practice " or " double slag process ".Therefore can save a large amount of
Equipment investment cost and the operational process of craft avoiding complexity, it is achieved that low cost dephosphorization of molten iron
Purpose.
Claims (2)
1. one kind utilizes the method that ANS-OB refining furnace carries out dephosphorization of molten iron, it is characterised in that specifically include following steps:
1) use dephosphorization hot-metal bottle, molten iron is transported to position of skimming, first molten iron is taken off Slag treatment, after having skimmed, molten iron is carried out thermometric sampling, detect phosphorus content；
2) molten iron being transported to ANS-OB refining furnace station, be first turned on bottom blown gas valve and carry out stirring of blowing, gas flow is 5-6Nm3/h·t；In tank, a point 1-3 criticizes addition slag material, and it is 20-50kg/t that slag material adds total amount；
3) utilizing the spray gun above ANS-OB refining furnace impregnating cover to be blown into oxygen or air, gas flow controls at 5-10Nm3/h·t；
4), after dephosphorization treatment completes, owing to slag blanket is thicker, molten iron is taken off Slag treatment；
5) after having skimmed, carry out thermometric sampling, detect phosphorus content；
Step 2) described in slag material be CaO, iron oxides, dolomite, CaF2Mixture, the most each constituent mass percentage ratio is CaO 35-55%, iron oxides 20-35%, dolomite 8-15%, CaF25-15%.
The method that a kind of ANS-OB of utilization refining furnace the most according to claim 1 carries out dephosphorization of molten iron, it is characterised in that step 2) described in bottom blown gas be argon or nitrogen.
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| CN105861781B (en) * | 2015-01-23 | 2017-09-26 | 鞍钢股份有限公司 | A kind of method of refining of Si killed steel through ANS OB techniques |
| CN106702082B (en) * | 2015-11-17 | 2018-06-26 | 鞍钢股份有限公司 | A kind of method for improving ANS refining furnace impregnating cover access times |
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| CN102876843A (en) * | 2012-06-28 | 2013-01-16 | 辽宁天和科技股份有限公司 | Method for producing ultralow phosphoretic steel through carrying out CAS-OB molten steel ladle refining on premelting calcium ferrite |
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