CN104451033B - Half steel desulfurization dephosphorization agent and its production and use - Google Patents
Half steel desulfurization dephosphorization agent and its production and use Download PDFInfo
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Abstract
The present invention relates to half steel desulfurization dephosphorization agent and its production and use, belong to field of iron and steel smelting. The technical problem to be solved in the present invention is to provide a kind of new half steel desulfurization dephosphorization agent. Half steel desulfurization dephosphorization agent, by the component of following weight part mix even after obtain through transpassivation: carbon dust 5 parts, calcium aluminate 5��15 parts, 5��10 parts, sodium carbonate, 5��10 parts, sodium-chlor, ferric oxide 10��20 parts, quickened lime 50��70 parts. Further, the invention also discloses the preparation method of described half steel desulfurization dephosphorization agent and its purposes in half steel desulfurization dephosphorization. Half steel desulfurization dephosphorization agent preparation method of the present invention is simple, it is possible to carries out effective dephosphorization under the prerequisite ensureing desulfurization degree, is conducive to steel-making converter to carry out less-slag operation, has saved cost.
Description
Technical field
The present invention relates to half steel desulfurization dephosphorization agent and its production and use, belong 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 is content of vanadium height compared with common molten iron, 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 due to 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 special pre-dephosphorization of 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, adopting the little of the pre-dephosphorization of molten iron, Baosteel is ability pre-dephosphorization in fish torpedo ladle when producing low phosphoretic steel only. At present, the iron and steel enterprise that employing blowing process carries out desulfurization is more, therefore can desulfurization and dephosphorization be carried out at a station, to alleviate the task of follow-up converter steelmaking dephosphorization simultaneously.
The Chinese patent application that publication number is CN103320575A discloses " a kind of molten steel desulfurizing dephosphorization treatment agent and preparation method ", and treatment agent chemical component weight per-cent is: ferric oxide FeO+Fe2O3: 15-25%; Metallic lithium or compound 10-20%; CaF2: 5%-10%; Al2O3: 8%-15%; Mishmetal: 0.5-2%, clout is CaO. Described metallic lithium or compound are Li, Li2O��LiOH��Li2CO3In any one major ingredient. Prepare the preparation method of molten steel desulfurizing dephosphorization treatment agent according to claim 1: by a described raw material ball milling mixing also pre-fired mixture, calcined temperature is 1100 DEG C-1200 DEG C; It is 1-2mm that raw mixture after pre-burning is crushed to size range, then stirring has been mixed evenly.
The Chinese patent application that publication number is CN103540711A discloses " a kind of method to desulfurization dephosphorization while of half steel ", with desulfurization oxygen rifle, half steel is carried out first stage winding-up, and its injection material is that helping using rare gas element as carrier blows pulvis; With desulphurization spray gun, half steel being carried out subordinate phase winding-up, its injection material is that helping using rare gas element as carrier blows pulvis and deactivating magnesium powder mixture; With desulfurization oxygen rifle, half steel is carried out phase III winding-up, 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 and blows pulvis and be made up of the sodium oxide of the passive lime of be weight 55��80 parts, the ferric oxide of 5��15 parts and 20��30 parts.
Publication number is that the Chinese patent application of CN1718762A discloses " molten iron stokehold is desulfurization or three de-thorough liberation blast furnace and converters simultaneously significantly ", the molten iron gushed after casting house sand mouth point spreads soda significantly desulfurization dephosphorization desiliconization and even refining schreyerite time vanadium extraction hot metal pretreatment novel process.
The Chinese patent application that publication number is 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.
The Chinese patent application that publication number is CN1974797A discloses " desulfurizing and dephosphoring refining agent for external refining of molten steel ", treatment agent by weight percentage (%) containing BaO35��70, BaF210��35, MnO5��13, CaO4��10, Al2O3More than 2��10 is impurity and binding agent.
The Chinese patent application that publication number is 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 BaCO30.6��1.8 part, CaF2And/or BaCl20.3��0.6 part, Fe2O30.10��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 1cm3��
Summary of the invention
First technical problem that the present invention to be solved is to provide a kind of new half steel desulfurization dephosphorization agent.
Half steel desulfurization dephosphorization agent, by the component of following weight part mix even after obtain through transpassivation: carbon dust 5 parts, calcium aluminate 5��15 parts, 5��10 parts, sodium carbonate, 5��10 parts, sodium-chlor, ferric oxide 10��20 parts, quickened lime 50��70 parts.
Further, preferably, described half steel desulfurization dephosphorization agent is obtained through passivation by the component of following weight part: carbon dust 5 parts, calcium aluminate 12 parts, 8 parts, sodium carbonate, 6 parts, sodium-chlor, ferric oxide 18 parts, quickened lime 51 parts.
Preferably, the purity of described ferric oxide, sodium carbonate, calcium aluminate, sodium oxide, carbon dust > 95%; Granularity < 100 order of described ferric oxide, sodium carbonate, calcium aluminate, sodium oxide, carbon dust, quickened lime.
Further, described quickened lime obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is 80%��90%, it is more preferable to be 85%��90%.
The 2nd technical problem that the present invention to be solved is to provide the preparation method of above-mentioned half steel desulfurization dephosphorization agent.
Further, the invention also discloses the preparation method of above-mentioned half steel desulfurization dephosphorization agent, comprise the steps:
A, each component is mixed according to proportioning, obtain mixture;
B, mixture passivating solution is carried out Passivation Treatment.
The 3rd technical problem that the present invention to be solved is to provide the purposes of above-mentioned half steel desulfurization dephosphorization agent.
Further, the invention also discloses the purposes of described half steel desulfurization dephosphorization agent in half steel desulfurization dephosphorization.
Preferably, the consumption of described half steel desulfurization dephosphorization agent is 5��7kg/t half steel.
Further, the invention also discloses the method for half steel desulfurization dephosphorization, after comprising the steps: that vanadium extraction by converter blowing terminates, it is that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, injecting velocity is 3��5kg/min, and deactivating magnesium powder consumption is 0.5��1kg/t half steel; Then being that carrier half steel desulfurization dephosphorization agent of the present invention of jetting carries out desulfurization and dephosphorization taking nitrogen, injecting velocity is 35��50kg/min, and half steel desulfurization dephosphorization agent consumption is 5��7kg/t half steel; Winding-up carries out taking off Slag treatment after terminating.
Preferably, described deactivating magnesium powder grade > 98%, density is 0.88��0.98g/cm3, < 2mm, is greater than 1.2mm grade and is not more than 2% granularity, is less than 0.15mm grade and is not more than 10%.
The useful effect of the present invention:
1, half steel desulfurization dephosphorization agent preparation method of the present invention is simple.
2, adopting half steel desulfurization dephosphorization agent of the present invention to be processed by half steel, dephosphorization rate can reach more than 70%, and desulfurization degree can reach more than 85%.
3, half steel desulfurization dephosphorization agent of the present invention can carry out effective dephosphorization under the prerequisite ensureing desulfurization degree, is conducive to steel-making converter to carry out less-slag operation, has saved cost.
Embodiment
Half steel desulfurization dephosphorization agent of the present invention, by the component of following weight part mix even after obtain through transpassivation: by the component of following weight part mix even after obtain through transpassivation: carbon dust 5 parts, calcium aluminate 5��15 parts, 5��10 parts, sodium carbonate, 5��10 parts, sodium-chlor, ferric oxide 10��20 parts, quickened lime 50��70 parts.
Further, preferably, described half steel desulfurization dephosphorization agent by the component of following weight part mix even after obtain through passivation: carbon dust 5 parts, calcium aluminate 12 parts, 8 parts, sodium carbonate, 6 parts, sodium-chlor, ferric oxide 18 parts, quickened lime 51 parts.
Further, preferably, the purity of described ferric oxide, sodium carbonate, calcium aluminate, sodium oxide, carbon dust > 95%; Granularity < 100 order of described ferric oxide, sodium carbonate, calcium aluminate, sodium oxide, carbon dust, quickened lime.
Further, in order to improve sweetening effectiveness, the quickened lime in half steel desulfurization dephosphorization agent raw material of the present invention obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is preferably 80%��90%, it is more preferable to 85%��90%. CaO can generate CaS with the S reaction in molten iron.
Further, the invention also discloses the preparation method of above-mentioned half steel desulfurization dephosphorization agent, comprise the steps:
C, each component is mixed according to proportioning, obtain mixture;
D, mixture passivating solution is carried out Passivation Treatment.
Further, in described b step, kind and consumption to passivating solution there is no specific requirement, in a word, by mixture passivation.
Further, in order to prevent the moisture absorption, above-mentioned a step carries out under dry atmosphere, such as dry air, nitrogen etc.; Sodium salt adopts before use and packs.
Further, the invention also discloses the purposes of above-mentioned half steel desulfurization dephosphorization agent in half steel desulfurization dephosphorization. Preferably, its consumption is 5��7kg/t half steel.
Further, the invention also discloses the method for half steel desulfurization dephosphorization, after comprising the steps: that vanadium extraction by converter blowing terminates, it is that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, injecting velocity controls at 3��5kg/min, and deactivating magnesium powder consumption is 0.5��1kg/t half steel; Then being that carrier half steel desulfurization dephosphorization agent of the present invention of jetting carries out desulfurization and dephosphorization taking nitrogen, injecting velocity controls at 35��50kg/min, and half steel desulfurization dephosphorization agent consumption is 5��7kg/t half steel; Winding-up carries out taking off Slag treatment after terminating.
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, 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 taking nitrogen, spray gun is from 500��1500mm at the bottom of half cylinder of steel, deactivating magnesium powder consumption is 0.5��1kg/t half steel, injecting velocity controls at 3��5kg/min, when deactivating magnesium powder winding-up amount promotes desulphurization spray gun after reaching requirement, then dephosphorization spray gun is fallen, start taking nitrogen to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization 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, winding-up carries out taking off Slag treatment after terminating.
Wherein, described deactivating magnesium powder grade > 98%, density is 0.88��0.98g/cm3, < 2mm meanwhile, is greater than 1.2mm grade and is not more than 2%, is less than 0.15mm grade and is not more than 10% granularity.
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 of carbon dust used > 90%, the purity of calcium aluminate > 95%, the purity of sodium carbonate > 98%, the purity of sodium-chlor > 99%, the purity of ferric oxide > 95%, the purity of quickened lime > 85%; 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/cm3, granularity is < 2mm, meanwhile, is greater than 1.2mm grade and is not more than 2%, is less than 0.15mm grade and is not more than 10%.
Embodiment 1
The preparation of half steel desulfurization dephosphorization agent:
5kg carbon dust, 15kg calcium aluminate, 5kg sodium carbonate, 5kg sodium-chlor, 20kg ferric oxide, 50kg quickened lime are used passivating solution passivation after mixing, obtains half steel desulfurization dephosphorization agent.
Wherein, in passive lime, CaO content is 86%wt.
Adopt above-mentioned half steel desulfurization dephosphorization agent that half steel is carried out desulfurization dephosphorization process:
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, spray gun to be desulfurization starts when being down to half steel below the liquid level 100cm of band desulfurization dephosphorization to be that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, spray gun is from 1500mm at the bottom of half cylinder of steel, deactivating magnesium powder consumption is 0.5kg/t half steel, injecting velocity controls at 3kg/min, when deactivating magnesium powder winding-up amount promotes desulphurization spray gun after reaching requirement, then dephosphorization spray gun is fallen, start taking nitrogen to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization when dephosphorization spray gun is down to half steel liquid level 50cm, 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, when desulfurization dephosphorization agent winding-up amount promotes dephosphorization spray gun after reaching requirement, and carry out taking off Slag treatment.
In half steel phosphorus content be 0.059%, sulphur content be 0.060%, after desulfurization dephosphorization terminates, 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 half steel desulfurization dephosphorization agent:
5kg carbon dust, 5kg calcium aluminate, 10kg sodium carbonate, 5kg sodium-chlor, 20kg ferric oxide, 55kg quickened lime are used passivating solution passivation after mixing, obtains half steel desulfurization dephosphorization agent.
Wherein, in passive lime, CaO content is 87%wt.
Adopt above-mentioned half steel desulfurization dephosphorization agent that half steel is carried out desulfurization dephosphorization process:
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, spray gun to be desulfurization starts when being down to half steel below the liquid level 50cm of band desulfurization dephosphorization to be that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, spray gun is from 500mm at the bottom of half cylinder of steel, deactivating magnesium powder consumption is 1kg/t half steel, injecting velocity controls at 5kg/min, when deactivating magnesium powder winding-up amount promotes desulphurization spray gun after reaching requirement, then dephosphorization spray gun is fallen, start taking nitrogen to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization when dephosphorization spray gun is down to half steel liquid level 50cm, 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 50kg/min, when desulfurization dephosphorization agent winding-up amount promotes dephosphorization spray gun after reaching requirement, and carry out taking off Slag treatment.
In half steel phosphorus content be 0.068%, sulphur content be 0.072%, after desulfurization dephosphorization terminates, 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 half steel desulfurization dephosphorization agent:
5kg carbon dust, 5kg calcium aluminate, 5kg sodium carbonate, 5kg sodium-chlor, 10kg ferric oxide, 70kg quickened lime are used passivating solution passivation after mixing, obtains half steel desulfurization dephosphorization agent.
Wherein, in passive lime, CaO content is 85%wt.
Adopt above-mentioned half steel desulfurization dephosphorization agent that half steel is carried out desulfurization dephosphorization process:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station. Being encased in different batch can by desulfurization dephosphorization agent, deactivating magnesium powder respectively before desulfurization, batch can adopts drying nitrogen sealing,
Spray gun to be desulfurization starts when being down to half steel below the liquid level 80cm of band desulfurization dephosphorization to be that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, spray gun is from 1000mm at the bottom of half cylinder of steel, deactivating magnesium powder consumption is 0.8kg/t half steel, injecting velocity controls at 4kg/min, when deactivating magnesium powder winding-up amount promotes desulphurization spray gun after reaching requirement, then dephosphorization spray gun is fallen, start taking nitrogen to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization when dephosphorization spray gun is down to half steel liquid level 90cm, 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, when desulfurization dephosphorization agent winding-up amount promotes dephosphorization spray gun after reaching requirement, and carry out taking off Slag treatment.
In half steel phosphorus content be 0.052%, sulphur content be 0.066%, after desulfurization dephosphorization terminates, 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 half steel desulfurization dephosphorization agent:
5kg carbon dust, 12kg calcium aluminate, 8kg sodium carbonate, 6kg sodium-chlor, 18kg ferric oxide, 51kg quickened lime are used passivating solution passivation after mixing, obtains half steel desulfurization dephosphorization agent.
Wherein, in passive lime, CaO content is 85%wt.
Adopt above-mentioned half steel desulfurization dephosphorization agent that half steel is carried out desulfurization dephosphorization process:
After vanadium extraction by converter blowing terminates, the half steel of non-desulfurization, dephosphorization is transported to blowing desulfurization station. Being encased in different batch can by desulfurization dephosphorization agent, deactivating magnesium powder respectively before desulfurization, batch can adopts drying nitrogen sealing,
Spray gun to be desulfurization starts when being down to half steel below the liquid level 60cm of band desulfurization dephosphorization to be that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, spray gun is from 800mm at the bottom of half cylinder of steel, deactivating magnesium powder consumption is 0.75kg/t half steel, injecting velocity controls at 4.5kg/min, when deactivating magnesium powder winding-up amount promotes desulphurization spray gun after reaching requirement, then dephosphorization spray gun is fallen, start taking nitrogen to be that carrier blowing desulfurization dephosphorizing agent carries out desulfurization dephosphorization when dephosphorization spray gun is down to half steel liquid level 60cm, 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, when desulfurization dephosphorization agent winding-up amount promotes dephosphorization spray gun after reaching requirement, and carry out taking off Slag treatment.
In half steel phosphorus content be 0.082%, sulphur content be 0.061%, after desulfurization dephosphorization terminates, half steel phosphorus content is 0.013%, and dephosphorization rate reaches 84.1%, and sulphur content is 0.008%, and desulfurization degree is 86.9%.
Claims (12)
1. half steel desulfurization dephosphorization agent, it is characterised in that, by the component of following weight part mix even after obtain through transpassivation: carbon dust 5 parts, calcium aluminate 5��15 parts, 5��10 parts, sodium carbonate, 5��10 parts, sodium-chlor, ferric oxide 10��20 parts, quickened lime 50��70 parts.
2. half steel desulfurization dephosphorization agent according to claim 1, it is characterised in that, by the component of following weight part mix even after obtain through transpassivation: carbon dust 5 parts, calcium aluminate 12 parts, 8 parts, sodium carbonate, 6 parts, sodium-chlor, ferric oxide 18 parts, quickened lime 51 parts.
3. half steel desulfurization dephosphorization agent according to claim 1 and 2, it is characterised in that: the purity of described ferric oxide, sodium carbonate, calcium aluminate, sodium-chlor, carbon dust > 95%; Granularity < 100 order of described ferric oxide, sodium carbonate, calcium aluminate, sodium-chlor, carbon dust, quickened lime.
4. half steel desulfurization dephosphorization agent according to claim 1 and 2, it is characterised in that: described quickened lime obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is 80%��90%.
5. half steel desulfurization dephosphorization agent according to claim 3, it is characterised in that: described quickened lime obtains passive lime through transpassivation, and in described passive lime, the mass percentage of CaO is 80%��90%.
6. half steel desulfurization dephosphorization agent according to claim 4, it is characterised in that: in described passive lime, the mass percentage of CaO is 85%��90%.
7. half steel desulfurization dephosphorization agent according to claim 5, it is characterised in that: in described passive lime, the mass percentage of CaO is 85%��90%.
8. the preparation method of half steel desulfurization dephosphorization agent described in the arbitrary item of claim 1��7, it is characterised in that, comprise the steps:
A, each component is mixed according to proportioning, obtain mixture;
B, mixture passivating solution is carried out Passivation Treatment.
9. purposes in half steel desulfurization dephosphorization of half steel desulfurization dephosphorization agent described in the arbitrary item of claim 1��7.
10. the purposes of half steel desulfurization dephosphorization agent according to claim 9 in half steel desulfurization dephosphorization, it is characterised in that: the consumption of described half steel desulfurization dephosphorization agent is 5��7kg/t half steel.
The method of 11. half steel desulfurization dephosphorizations, it is characterised in that, after comprising the steps: that vanadium extraction by converter blowing terminates, it is that carrier winding-up deactivating magnesium powder carries out desulfurization taking nitrogen, injecting velocity is 3��5kg/min, and deactivating magnesium powder consumption is 0.5��1kg/t half steel; Then being that the carrier half steel desulfurization dephosphorization agent of winding-up according to any one of claim 1��7 carries out desulfurization and dephosphorization taking nitrogen, injecting velocity is 35��50kg/min, and half steel desulfurization dephosphorization agent consumption is 5��7kg/t half steel; Winding-up carries out taking off Slag treatment after terminating.
The method of 12. half steel desulfurization dephosphorizations according to claim 11, it is characterised in that: described deactivating magnesium powder grade > 98%, density is 0.88��0.98g/cm3, < 2mm, is greater than 1.2mm grade and is not more than 2% granularity, is less than 0.15mm grade and is not more than 10%.
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| JPH02232313A (en) * | 1989-03-06 | 1990-09-14 | Taiyo Giken Kogyo Kk | Dephosphorizing agent for molten steel |
| JP5525939B2 (en) * | 2010-07-02 | 2014-06-18 | 大阪鋼灰株式会社 | Lime-based flux and its manufacturing method |
| 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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