CN104480254A - Desulfuration and dephosphorization agent for semisteel and preparation method and application thereof - Google Patents
Desulfuration and dephosphorization agent for semisteel and preparation method and application thereof Download PDFInfo
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- CN104480254A CN104480254A CN201510003432.2A CN201510003432A CN104480254A CN 104480254 A CN104480254 A CN 104480254A CN 201510003432 A CN201510003432 A CN 201510003432A CN 104480254 A CN104480254 A CN 104480254A
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Abstract
The invention relates to a desulfuration and dephosphorization agent for semisteel and a preparation method and application of the desulfuration and dephosphorization agent, and belongs to the field of steel smelting. The technical aim of providing the novel desulfuration and dephosphorization agent for the semisteel is achieved. The desulfuration and dephosphorization agent for the semisteel is formed by evenly mixing and passivating, by weight, five parts of graphite powder, 10-20 parts of calcium metasilicate, 5-10 parts of sodium carbonate, 5-10 parts of manganese dioxide, 10-20 parts of ferric oxide and 40-70 parts of active lime. The preparation method of the desulfuration and dephosphorization agent for the semisteel and the application of the desulfuration and dephosphorization agent in semisteel desulfuration and dephosphorization are further disclosed. The preparation method of the desulfuration and dephosphorization agent for the semisteel is simple, effective dephosphorization can be carried out on the premise of guaranteeing the desulfuration rate, a steelmaking converter can carry out slagless steelmaking, and cost is saved.
Description
Technical field
Desulfurization dephosphorization agent that the present invention relates to half steel and its production and use, belongs to field of iron and steel smelting.
Background technology
China is vanadium titano-magnetite big country, and the molten iron that vanadium titano-magnetite blast-furnace smelting goes out content of vanadium compared with common molten iron is high, and vanadium is a kind of important resource, therefore vanadium extraction must produce vanadium slag before molten iron-steelmaking.And the half steel silicon of gained, Fe content are all trace after vanadium extraction, slagging when this just causes converter steelmaking, heating element are few, and slag making difficulty, dephosphorization difficulty is very big.But, just because of this feature of half steel, also provide good condition for carrying out dephosphorization before converter: after carrying out desiliconization process specially, carry out dephosphorization again.
For the problem how molten steel phosphorus content controls, since the 1980's, develop various treatment process: 1. pre-dephosphorization in hot metal ladle or torpedo car; 2. the pre-dephosphorization of special converter molten iron; 3. convertor steelmaking process deep dephosphorization; 4. ladle refining process reduces rephosphorization.At present these methods have industrially been succeeded application all.Since generation nineteen ninety, the iron and steel enterprise of Japan and Korea S adopts molten iron pre-dephosphorization technology in special converter mostly, and China adopts converter steelmaking dephosphorization technology substantially, adopt the little of the pre-dephosphorization of molten iron, Baosteel is ability pre-dephosphorization in fish torpedo ladle when producing Low-phosphorus Steel only.At present, the iron and steel enterprise that employing blowing process carries out desulfurization is more, therefore desulfurization and dephosphorization can be carried out at a station, to alleviate the task of follow-up converter steelmaking dephosphorization simultaneously.
Publication number is that the Chinese patent application of CN103320575A discloses " agent of a kind of molten steel desulfurizing dephosphorization treatment and preparation method ", and treatment agent chemical component weight per-cent is: ferric oxide FeO+Fe
2o
3: 15-25%; Metallic lithium or compound 10-20%; CaF
2: 5%-10%; Al
2o
3: 8%-15%; Mishmetal: 0.5-2%, clout is CaO.Described metallic lithium or compound are Li, Li
2o, LiOH, Li
2cO
3in any one major ingredient.Prepare the preparation method of molten steel desulfurizing dephosphorization treatment according to claim 1 agent: by a described raw material ball milling mixing also pre-fired mixture, calcined temperature is 1100 DEG C-1200 DEG C; Raw mixture after pre-burning being crushed to size range is 1-2mm, then stirs and be mixed evenly and form.
Publication number is that the Chinese patent application of CN103540711A discloses " a kind of method to desulfurization dephosphorization while of half steel ", and carry out first stage winding-up with desulfurization oxygen rifle to half steel, its injection material is that helping using rare gas element as carrier blows pulvis; Carry out subordinate phase winding-up with desulphurization spray gun to half steel, its injection material is that helping using rare gas element as carrier blows pulvis and deactivating magnesium powder mixture; With desulfurization oxygen rifle, phase III winding-up is carried out to half steel, its injection material is that helping using rare gas element as carrier blows pulvis, wherein, described half steel is the molten iron of vanadium-bearing hot metal gained after vanadium extraction by converter blowing, helps to blow pulvis and be made up of the sodium oxide of the passive lime of 55 ~ 80 parts by weight, the ferric oxide of 5 ~ 15 parts and 20 ~ 30 parts.
Publication number is that the Chinese patent application of CN1718762A discloses " before molten iron furnace significantly desulfurization or simultaneously three de-thorough liberation blast furnace and converters ", the molten iron of gushing after casting house sand mouth point spreads soda significantly desulfurization dephosphorization desiliconization and even refining schreyerite time vanadium extraction hot metal pretreatment novel process.
Publication number is that the Chinese patent application of CN1757461A discloses " modified castability auxiliary agent is bred in the heat-preservation exhaust desulfurization dephosphorization purification of molten casting iron ", and the moiety of castability auxiliary agent is: active free state Graphite Powder 99, calcium silicate powder, manganese dioxide powder, vanadium oxide powder, magnesia powder, molybdenum oxide powder.
Publication number is that the Chinese patent application of CN1974797A discloses " desulfurizing and dephosphoring refining agent for external refining of molten steel ", treatment agent by weight percentage (%) containing BaO 35 ~ 70, BaF
210 ~ 35, MnO 5 ~ 13, CaO 4 ~ 10, Al
2o
3more than 2 ~ 10 is impurity and binding agent.
Publication number is that the Chinese patent application of CN101294235A discloses " a kind of composite slag for smelting stainless steel with back method at same time of desulfurization dephosphorization ", and composite slag comprises following component and weight proportion: when CaO content is 1 part, BaO and/or BaCO
30.6 ~ 1.8 part, CaF
2and/or BaCl
20.3 ~ 0.6 part, Fe
2o
30.10 ~ 0.15 part.When making CaO raw material with lime, in lime, the content of CaO is greater than 92%, and sulphur content is less than 0.025%, and dioxide-containing silica is less than 1%.Other component requirements purity more than 98%.Composite slag granularity is less than 1cm
3.
Summary of the invention
First technical problem that the present invention will solve is to provide a kind of desulfurization dephosphorization agent of new half steel.
The desulfurization dephosphorization agent of half steel, obtains through transpassivation after being mixed: Graphite Powder 99 5 parts, Calucium Silicate powder 10 ~ 20 parts, 5 ~ 10 parts, sodium carbonate, Manganse Dioxide 5 ~ 10 parts, ferric oxide 10 ~ 20 parts, quickened lime 40 ~ 70 parts by the component of following weight part.
Further, preferably, the desulfurization dephosphorization agent of described half steel obtains through passivation after being mixed by the component of following weight part: Graphite Powder 99 5 parts, Calucium Silicate powder 15 parts, 8 parts, sodium carbonate, Manganse Dioxide 6 parts, ferric oxide 16 parts, quickened lime 50 parts.
Preferably, the purity >95% of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, brown iron oxide; Granularity equal < 100 order of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, ferric oxide, quickened lime.
Further, described quickened lime obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is 80% ~ 90%, is more preferably 85% ~ 90%.
Second technical problem that the present invention will solve is to provide the preparation method of the desulfurization dephosphorization agent of above-mentioned half steel.
Further, the invention also discloses the preparation method of the desulfurization dephosphorization agent of above-mentioned half steel, comprise the steps:
A, each component to be mixed according to proportioning, obtain mixture;
B, mixture passivating solution is carried out Passivation Treatment.
The 3rd technical problem that the present invention will solve is to provide the purposes of the desulfurization dephosphorization agent of above-mentioned half steel.
Further, the invention also discloses the purposes of desulfurization dephosphorization agent in semi-steel dephosphorizing desulfurizing of described half steel.
Preferably, the consumption of the desulfurization dephosphorization agent of described half steel is 5 ~ 7kg/t half steel.
Further, the invention also discloses the method for semi-steel dephosphorizing desulfurizing, after comprising the steps: that vanadium extraction by converter blowing terminates, be that desulfurization and dephosphorization are carried out in the jet desulfurization dephosphorization agent of half steel of the present invention of carrier with nitrogen, injecting velocity is 35 ~ 50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5 ~ 7kg/t half steel; Then be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, injecting velocity is 3 ~ 5kg/min, and deactivating magnesium powder consumption is 0.5 ~ 1kg/t half steel; Process of skimming is carried out after winding-up terminates.
Preferably, described deactivating magnesium powder grade >98%, density is 0.88 ~ 0.98g/cm
3, granularity <2mm, is greater than 1.2mm grade and is not more than 2%, is less than 0.15mm grade and is not more than 10%.
Beneficial effect of the present invention:
1, the desulfurization dephosphorization agent preparation method of half steel of the present invention is simple.
2, adopt the desulfurization dephosphorization agent of half steel of the present invention to process half steel, dephosphorization rate can reach more than 70%, and desulfurization degree can reach more than 85%.
3, the desulfurization dephosphorization agent of half steel of the present invention can carry out effective dephosphorization under the prerequisite ensureing desulfurization degree, is conducive to steel-making converter and carries out less-slag operation, saved cost.
Embodiment
The desulfurization dephosphorization agent of half steel of the present invention, obtains through transpassivation after being mixed: Graphite Powder 99 5 parts, Calucium Silicate powder 10 ~ 20 parts, 5 ~ 10 parts, sodium carbonate, Manganse Dioxide 5 ~ 10 parts, ferric oxide 10 ~ 20 parts, quickened lime 40 ~ 70 parts by the component of following weight part.
Further, preferably, the desulfurization dephosphorization agent of described half steel obtains through passivation after being mixed by the component of following weight part: Graphite Powder 99 5 parts, Calucium Silicate powder 15 parts, 8 parts, sodium carbonate, Manganse Dioxide 6 parts, ferric oxide 16 parts, quickened lime 50 parts.
Preferably, the purity >95% of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, brown iron oxide; Granularity equal < 100 order of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, ferric oxide, quickened lime.
Further, in order to improve sweetening effectiveness, the quickened lime in the desulfurization dephosphorization agent raw material of half steel of the present invention obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is preferably 80% ~ 90%, and more preferably 85% ~ 90%.CaO can react with the S in molten iron and generate CaS.
Further, the invention also discloses the preparation method of the desulfurization dephosphorization agent of above-mentioned half steel, comprise the steps:
C, each component to be mixed according to proportioning, obtain mixture;
D, mixture passivating solution is carried out Passivation Treatment.
Further, in described b step, particular requirement be there is no, in a word, by mixture passivation to the kind of passivating solution and consumption.
Further, in order to prevent the moisture absorption, above-mentioned a step is carried out, as dry air, nitrogen etc. under dry atmosphere; Sodium salt adopts before use and packs.
Further, the invention also discloses the purposes of desulfurization dephosphorization agent in semi-steel dephosphorizing desulfurizing of above-mentioned half steel.Preferably, its consumption is 5 ~ 7kg/t half steel.
Further, the invention also discloses the method for semi-steel dephosphorizing desulfurizing, after comprising the steps: that vanadium extraction by converter blowing terminates, be that desulfurization and dephosphorization are carried out in the jet desulfurization dephosphorization agent of half steel of the present invention of carrier with nitrogen, injecting velocity is 35 ~ 50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5 ~ 7kg/t half steel; Then be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, injecting velocity is 3 ~ 5kg/min, and deactivating magnesium powder consumption is 0.5 ~ 1kg/t half steel; Process of skimming is carried out after winding-up terminates.
As more preferably scheme, in actual production, after vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station.Respectively by desulfurization dephosphorization agent before desulfurization, deactivating magnesium powder is encased in different batch can, batch can adopts drying nitrogen sealing, start to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization with nitrogen when dephosphorization spray gun is down to half steel liquid level 50cm ~ 100cm, spray gun is from 500 ~ 1500mm at the bottom of half cylinder of steel, desulfurization dephosphorization agent consumption controls at 5 ~ 7kg/t half steel, injecting velocity controls at 35 ~ 50kg/min, dephosphorization spray gun is promoted after desulfurization dephosphorization agent winding-up amount reaches requirement, then desulphurization spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cm ~ 100cm to be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, spray gun is from 500 ~ 1500mm at the bottom of half cylinder of steel, magnesium powder consumption is 0.5 ~ 1kg/t half steel, injecting velocity controls at 3 ~ 5kg/min, desulphurization spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
Wherein, described deactivating magnesium powder grade >98%, density is 0.88 ~ 0.98g/cm
3, granularity <2mm, meanwhile, is greater than 1.2mm grade and is not more than 2%, be less than 0.15mm grade and be not more than 10%.
Below in conjunction with embodiment, the specific embodiment of the present invention is further described, does not therefore limit the present invention among described scope of embodiments.
In following embodiment, the purity >98% of the purity >96% of carbon dust used, the purity >95% of calcium aluminate, sodium carbonate, the purity >99% of sodium-chlor, the purity >95% of ferric oxide, the purity >80% of quickened lime; Meanwhile, the granularity of said components equal < 100 order;
Passivating solution used is acetic acid and magnesium chloride mixed solution;
Described deactivating magnesium powder grade >98%, density is 0.95g/cm
3, granularity is < 2mm, meanwhile, is greater than 1.2mm grade and is not more than 2%, be less than 0.15mm grade and be not more than 10%.
Embodiment 1
The preparation of the desulfurization dephosphorization agent of half steel:
Use passivating solution passivation by after 5kg Graphite Powder 99,15kg Calucium Silicate powder, 5kg sodium carbonate, 5kg Manganse Dioxide, 20kg ferric oxide, the mixing of 50kg quickened lime, obtain the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 83%wt.
The desulfurization dephosphorization agent of above-mentioned half steel is adopted to carry out desulfurization dephosphorization process to half steel:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station.Respectively by desulfurization dephosphorization agent before desulfurization, deactivating magnesium powder is encased in different batch can, batch can adopts drying nitrogen sealing, start to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization with nitrogen when dephosphorization spray gun is down to half steel below the liquid level 100cm of dephosphorization to be desulfurization, spray gun is from 500mm at the bottom of half cylinder of steel, desulfurization dephosphorization agent consumption controls at 5kg/t half steel, injecting velocity controls at 35kg/min, dephosphorization spray gun is promoted after desulfurization dephosphorization agent winding-up amount reaches requirement, then desulphurization spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cm to be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, spray gun is from 1500mm at the bottom of half cylinder of steel, magnesium powder consumption is 0.5kg/t half steel, injecting velocity controls at 3kg/min, desulphurization spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel, phosphorus content is 0.059%, sulphur content is 0.060%, after desulfurization dephosphorization terminates, and half steel phosphorus content is 0.012%, and dephosphorization rate reaches 79.7%, and sulphur content is 0.009%, and desulfurization degree is 85%.
Embodiment 2
The preparation of the desulfurization dephosphorization agent of half steel:
Use passivating solution passivation by after 5kg Graphite Powder 99,5kg Calucium Silicate powder, 10kg sodium carbonate, 5kg Manganse Dioxide, 20kg ferric oxide, the mixing of 55kg quickened lime, obtain the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 81%wt.
The desulfurization dephosphorization agent of above-mentioned half steel is adopted to carry out desulfurization dephosphorization process to half steel:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station.Respectively by desulfurization dephosphorization agent before desulfurization, deactivating magnesium powder is encased in different batch can, batch can adopts drying nitrogen sealing, start to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization with nitrogen when dephosphorization spray gun is down to half steel below the liquid level 50cm of dephosphorization to be desulfurization, spray gun is from 500mm at the bottom of half cylinder of steel, desulfurization dephosphorization agent consumption controls at 7kg/t1, injecting velocity controls at 50kg/min, dephosphorization spray gun is promoted after desulfurization dephosphorization agent winding-up amount reaches requirement, then desulphurization spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cmcm to be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, spray gun is from 500mm at the bottom of half cylinder of steel, magnesium powder consumption is 1kg/t half steel, injecting velocity controls at 5kg/min, desulphurization spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel, phosphorus content is 0.068%, sulphur content is 0.072%, after desulfurization dephosphorization terminates, and half steel phosphorus content is 0.019%, and dephosphorization rate reaches 71.0%, and sulphur content is 0.005%, and desulfurization degree is 93.0%.
Embodiment 3
The preparation of the desulfurization dephosphorization agent of half steel:
Use passivating solution passivation by after 5kg Graphite Powder 99,5kg Calucium Silicate powder, 5kg sodium carbonate, 5kg Manganse Dioxide, 10kg ferric oxide, the mixing of 70kg quickened lime, obtain the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 85%wt.
The desulfurization dephosphorization agent of above-mentioned half steel is adopted to carry out desulfurization dephosphorization process to half steel:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station.Respectively by desulfurization dephosphorization agent before desulfurization, deactivating magnesium powder is encased in different batch can, batch can adopts drying nitrogen sealing, start to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization with nitrogen when dephosphorization spray gun is down to half steel below the liquid level 80cm of dephosphorization to be desulfurization, spray gun is from 600mm at the bottom of half cylinder of steel, desulfurization dephosphorization agent consumption controls at 6.5kg/t half steel, injecting velocity controls at 45kg/min, dephosphorization spray gun is promoted after desulfurization dephosphorization agent winding-up amount reaches requirement, then desulphurization spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 90cm to be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, spray gun is from 1000mm at the bottom of half cylinder of steel, magnesium powder consumption is 0.8kg/t half steel, injecting velocity controls at 4kg/min, desulphurization spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel, phosphorus content is 0.052%, sulphur content is 0.066%, after desulfurization dephosphorization terminates, and half steel phosphorus content is 0.010%, and dephosphorization rate reaches 80.8%, and sulphur content is 0.008%, and desulfurization degree is 87.9%.
Embodiment 4
The preparation of the desulfurization dephosphorization agent of half steel:
Use passivating solution passivation by after 5kg Graphite Powder 99,15kg Calucium Silicate powder, 8kg sodium carbonate, 6kg Manganse Dioxide, 16kg ferric oxide, the mixing of 50kg quickened lime, obtain the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 85%wt.
The desulfurization dephosphorization agent of above-mentioned half steel is adopted to carry out desulfurization dephosphorization process to half steel:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station.Respectively by desulfurization dephosphorization agent before desulfurization, deactivating magnesium powder is encased in different batch can, batch can adopts drying nitrogen sealing, start to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization with nitrogen when dephosphorization spray gun is down to half steel below the liquid level 60cm of dephosphorization to be desulfurization, spray gun is from 500mm at the bottom of half cylinder of steel, desulfurization dephosphorization agent consumption controls at 7kg/t half steel, injecting velocity controls at 40kg/min, dephosphorization spray gun is promoted after desulfurization dephosphorization agent winding-up amount reaches requirement, then desulphurization spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 60cm to be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, spray gun is from 800mm at the bottom of half cylinder of steel, magnesium powder consumption is 0.7kg/t half steel, injecting velocity controls at 4.5kg/min, desulphurization spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel, phosphorus content is 0.071%, sulphur content is 0.056%, after desulfurization dephosphorization terminates, and half steel phosphorus content is 0.010%, and dephosphorization rate reaches 85.9%, and sulphur content is 0.008%, and desulfurization degree is 85.7%.
Claims (10)
1. the desulfurization dephosphorization agent of half steel, it is characterized in that, obtain through transpassivation after being mixed by the component of following weight part: Graphite Powder 99 5 parts, Calucium Silicate powder 10 ~ 20 parts, 5 ~ 10 parts, sodium carbonate, Manganse Dioxide 5 ~ 10 parts, ferric oxide 10 ~ 20 parts, quickened lime 40 ~ 70 parts.
2. according to the desulfurization dephosphorization agent of claim 1 half steel, it is characterized in that, obtain through transpassivation after being mixed by the component of following weight part: Graphite Powder 99 5 parts, Calucium Silicate powder 15 parts, 8 parts, sodium carbonate, Manganse Dioxide 6 parts, ferric oxide 16 parts, quickened lime 50 parts.
3. the desulfurization dephosphorization agent of half steel according to claim 1 and 2, is characterized in that: the purity >95% of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, ferric oxide; Granularity equal < 100 order of described Graphite Powder 99, Calucium Silicate powder, sodium carbonate, Manganse Dioxide, ferric oxide, quickened lime.
4. the desulfurization dephosphorization agent of the half steel according to any one of claims 1 to 3, is characterized in that: described quickened lime obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is 80% ~ 90%.
5. the desulfurization dephosphorization agent of half steel according to claim 4, is characterized in that: in described passive lime, the mass percentage of CaO is 85% ~ 90%.
6. the preparation method of the desulfurization dephosphorization agent of the half steel described in any one of Claims 1 to 5, is characterized in that, comprise the steps:
A, each component to be mixed according to proportioning, obtain mixture;
B, mixture passivating solution is carried out Passivation Treatment.
7. the purposes of desulfurization dephosphorization agent in half steel desulfurization dephosphorization of the half steel described in any one of Claims 1 to 5.
8. the purposes of desulfurization dephosphorization agent in half steel desulfurization dephosphorization of half steel according to claim 7, is characterized in that: the consumption of the desulfurization dephosphorization agent of described half steel is 5 ~ 7kg/t half steel.
9. the method for half steel desulfurization dephosphorization, it is characterized in that, after comprising the steps: that vanadium extraction by converter blowing terminates, desulfurization and dephosphorization are carried out in the desulfurization dephosphorization agent of the half steel with nitrogen according to any one of carrier winding-up Claims 1 to 5, injecting velocity is 35 ~ 50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5 ~ 7kg/t half steel; Then be that carrier winding-up deactivating magnesium powder carries out desulfurization with nitrogen, injecting velocity is 3 ~ 5kg/min, and deactivating magnesium powder consumption is 0.5 ~ 1kg/t half steel; Process of skimming is carried out after winding-up terminates.
10. the method for half steel desulfurization dephosphorization according to claim 9, is characterized in that: described deactivating magnesium powder grade >98%, and density is 0.88 ~ 0.98g/cm
3, granularity <2mm, is greater than 1.2mm grade and is not more than 2%, is less than 0.15mm grade and is not more than 10%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108486454A (en) * | 2018-03-30 | 2018-09-04 | 攀钢集团攀枝花钢钒有限公司 | A kind of smelting process of ultra-low phosphoretic steel |
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| JPS61217515A (en) * | 1985-03-22 | 1986-09-27 | Nippon Kokan Kk <Nkk> | Production of extra-low phosphorus steel |
| CN103805746A (en) * | 2012-11-03 | 2014-05-21 | 无锡市锡山区鹅湖镇益民拉丝辅机厂 | Liquid iron dephosphorization agent |
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2015
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|---|---|---|---|---|
| JPS5811720A (en) * | 1981-07-13 | 1983-01-22 | Nippon Kokan Kk <Nkk> | Dephosphorization method for molten steel |
| JPS61217515A (en) * | 1985-03-22 | 1986-09-27 | Nippon Kokan Kk <Nkk> | Production of extra-low phosphorus steel |
| CN103805746A (en) * | 2012-11-03 | 2014-05-21 | 无锡市锡山区鹅湖镇益民拉丝辅机厂 | Liquid iron dephosphorization agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108486454A (en) * | 2018-03-30 | 2018-09-04 | 攀钢集团攀枝花钢钒有限公司 | A kind of smelting process of ultra-low phosphoretic steel |
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