CN104480254B - Desulfurization dephosphorization agent of half steel and its production and use - Google Patents
Desulfurization dephosphorization agent of half steel and its production and use Download PDFInfo
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Abstract
Desulfurization dephosphorization agent that the present invention relates to half steel and its production and use, belongs to field of iron and steel smelting.The technical problem to be solved in the present invention is to provide the desulfurization dephosphorization agent of a kind of new half steel.The desulfurization dephosphorization agent of half steel, the component of following weight portion obtain through transpassivation after mixing: obtained through transpassivation by the component of following weight portion: graphite powder 5 parts, calcium silicates 10～20 parts, sodium carbonate 5～10 parts, manganese dioxide 5～10 parts, ferrum oxide 10～20 parts, active lime 40～70 parts.Further, the invention also discloses the preparation method of the desulfurization dephosphorization agent of described half steel and its purposes in half steel desulfurization dephosphorization.The desulfurization dephosphorization agent preparation method of half steel of the present invention is simple, it is possible to carries out effective dephosphorization under the premise ensureing desulfurization degree, is conducive to steelmaking converter to carry out less-slag operation, has saved cost.
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 process 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, it is few that this results in slagging during pneumatic steelmaking, heating element, and slag making difficulty, dephosphorization difficulty is very big.But, just because of this feature of half steel, also it is carry out dephosphorization before converter to provide good condition: carry out dephosphorization again without exclusively carrying out after desiliconization processes.
For the problem how molten steel phosphorus content controls, since the 1980's, develop various processing method: 1. pre-dephosphorization in 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 pneumatic steelmaking dephosphorization technology substantially, adopts the little of the pre-dephosphorization of molten iron, and 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 can desulfurization be carried out at a station with dephosphorization, to alleviate the task of follow-up pneumatic 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 inorganic agent chemical component weight percentage ratio is: ferrum oxide FeO+Fe2O3: 15-25%；Lithium metal or compound 10-20%；CaF2: 5%-10%；Al2O3: 8%-15%；Mischmetal: 0.5-2%, clout is CaO.Described lithium metal or compound, for Li, Li2O、LiOH、Li2CO3In any one major ingredient.The preparation method of a kind of molten steel desulfurizing dephosphorization treatment agent prepared described in claim 1: by described raw material ball milling mixing pre-fired mixture, calcined temperature is 1100 DEG C-1200 DEG C；Raw mixture after pre-burning is crushed to particle size range is 1-2mm, is stirred for being mixed evenly and forms.
The Chinese patent application that publication number is CN103540711A discloses " a kind of method to half steel desulfurization dephosphorization simultaneously ", with desulfurization oxygen rifle, half steel is carried out first stage winding-up, and its injection material is blow powder using noble gas as helping of carrier；With desulfuring spray gun, half steel being carried out second stage winding-up, its injection material is blow powder and deactivating magnesium powder mixture using noble gas as helping of carrier；With desulfurization oxygen rifle, half steel is carried out phase III winding-up, its injection material is blow powder using noble gas as helping of carrier, wherein, described half steel is vanadium-bearing hot metal molten iron of gained after vanadium extraction by converter blowing, helps and blows powder and be made up of the sodium oxide of the passive lime of by weight 55～80 parts, the ferrum oxide of 5～15 parts and 20～30 parts.
The Chinese patent application that publication number is CN1718762A discloses " before molten iron furnace significantly desulfurization or simultaneously three de-thorough liberation blast furnace and converter ", and the molten iron gushed after cast house sand mouth divides the molten iron novel process for pretreating of vanadium extraction when spreading soda significantly desulfurization dephosphorization desiliconization or even refining schreyerite.
The Chinese patent application that publication number is CN1757461A discloses " the heat-preservation exhaust desulfurization dephosphorization of molten casting iron purifies and breeds modified castability auxiliary agent ", and the constituent of castability auxiliary agent is: activity free state graphite powder, 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 ", and inorganic agent (%) by weight percentage is 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 includes following components 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 Calx, in Calx, the content of CaO is more than 92%, and sulfur 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 invention solves the problems that is to provide the desulfurization dephosphorization agent of a kind of new half steel.
The desulfurization dephosphorization agent of half steel, the component of following weight portion obtain through transpassivation after mixing: graphite powder 5 parts, calcium silicates 10～20 parts, sodium carbonate 5～10 parts, manganese dioxide 5～10 parts, ferrum oxide 10～20 parts, active lime 40～70 parts.
Further, preferably, the desulfurization dephosphorization agent of described half steel obtains through passivation after being mixed by the component of following weight portion: graphite powder 5 parts, calcium silicates 15 parts, sodium carbonate 8 parts, manganese dioxide 6 parts, ferrum oxide 16 parts, active lime 50 parts.
Preferably, the purity of described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, brown iron oxide > 95%；Described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, ferrum oxide, active lime granularity equal < 100 order.
Further, described active lime obtains passive lime through transpassivation, and in described passive lime, the weight/mass percentage composition of CaO is 80%～90%, more preferably 85%～90%.
The preparation method that second technical problem that the invention solves the problems that is to provide the desulfurization dephosphorization agent of above-mentioned half steel.
Further, the preparation method that the invention also discloses the desulfurization dephosphorization agent of above-mentioned half steel, comprise the steps:
A, by each component according to proportioning mix, obtain mixed material；
B, mixed material passivating solution is passivated process.
The 3rd technical problem that the invention solves the problems that is to provide the purposes of the desulfurization dephosphorization agent of above-mentioned half steel.
Further, the invention also discloses the desulfurization dephosphorization agent of described half steel purposes in semi-steel dephosphorizing desulfurizing.
Preferably, the consumption of the desulfurization dephosphorization agent of described half steel is 5～7kg/t half steel.
Further, the method that the invention also discloses semi-steel dephosphorizing desulfurizing, after comprising the steps: that vanadium extraction by converter blowing terminates, desulfurization and dephosphorization is carried out with the desulfurization dephosphorization agent that nitrogen is carrier winding-up half steel of the present invention, injecting velocity is 35～50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5～7kg/t half steel；Then carrying out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, injecting velocity is 3～5kg/min, and deactivating magnesium powder consumption is 0.5～1kg/t half steel；Winding-up carries out, after terminating, process of skimming.
Preferably, described deactivating magnesium powder grade > 98%, density is 0.88～0.98g/cm3, < 2mm, is not more than 2% more than 1.2mm grade to granularity, is not more than 10% less than 0.15mm grade.
The method have the benefit that
1, the desulfurization dephosphorization agent preparation method of half steel of the present invention is simple.
2, adopting the desulfurization dephosphorization agent of half steel of the present invention that half steel is processed, dephosphorization rate is up to more than 70%, and desulfurization degree is up to more than 85%.
3, the desulfurization dephosphorization agent of half steel of the present invention can carry out effective dephosphorization under the premise ensureing desulfurization degree, is conducive to steelmaking converter to carry out less-slag operation, has saved cost.
Detailed description of the invention
The desulfurization dephosphorization agent of half steel of the present invention, the component of following weight portion obtain through transpassivation after mixing: graphite powder 5 parts, calcium silicates 10～20 parts, sodium carbonate 5～10 parts, manganese dioxide 5～10 parts, ferrum oxide 10～20 parts, active lime 40～70 parts.
Further, preferably, the desulfurization dephosphorization agent of described half steel obtains through passivation after being mixed by the component of following weight portion: graphite powder 5 parts, calcium silicates 15 parts, sodium carbonate 8 parts, manganese dioxide 6 parts, ferrum oxide 16 parts, active lime 50 parts.
Preferably, the purity of described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, brown iron oxide > 95%；Described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, ferrum oxide, active lime granularity equal < 100 order.
Further, in order to improve desulfurized effect, the active 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 weight/mass percentage composition of CaO is preferably 80%～90%, and more preferably 85%～90%.CaO can react generation CaS with the S in molten iron.
Further, the preparation method that the invention also discloses the desulfurization dephosphorization agent of above-mentioned half steel, comprise the steps:
C, by each component according to proportioning mix, obtain mixed material；
D, mixed material passivating solution is passivated process.
Further, in described b step, kind and consumption to passivating solution there is no particular requirement, in a word, are passivated by mixed material.
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 desulfurization dephosphorization agent of above-mentioned half steel purposes in semi-steel dephosphorizing desulfurizing.Preferably, its consumption is 5～7kg/t half steel.
Further, the method that the invention also discloses semi-steel dephosphorizing desulfurizing, after comprising the steps: that vanadium extraction by converter blowing terminates, desulfurization and dephosphorization is carried out with the desulfurization dephosphorization agent that nitrogen is carrier winding-up half steel of the present invention, injecting velocity is 35～50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5～7kg/t half steel；Then carrying out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, injecting velocity is 3～5kg/min, and deactivating magnesium powder consumption is 0.5～1kg/t half steel；Winding-up carries out, after terminating, process of skimming.
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 to seal, start to carry out desulfurization dephosphorization with nitrogen for carrier blowing desulfurization Dephosphorising agent when dephosphorization spray gun is down to half steel liquid level 50cm～100cm, spray gun is from the tank bottoms 500～1500mm of half 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 desulfuring spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cm～100cm to carry out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, spray gun is from the tank bottoms 500～1500mm of half steel, magnesium powder consumption is 0.5～1kg/t half steel, injecting velocity controls at 3～5kg/min, desulfuring 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/cm3, < 2mm meanwhile, is not more than 2% more than 1.2mm grade, is not more than 10% less than 0.15mm grade 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 > 96%, the purity of calcium aluminate > 95%, the purity of sodium carbonate > 98%, the purity of sodium chloride > 99%, the purity of ferrum oxide > 95%, the purity of active lime > 80%；Meanwhile, the granularity of said components equal < 100 order；
Passivating solution used is acetic acid and magnesium chloride mixed liquor；
Described deactivating magnesium powder grade > 98%, density is 0.95g/cm3, granularity is < 2mm, meanwhile, is not more than 2% more than 1.2mm grade, is not more than 10% less than 0.15mm grade.
Embodiment 1
The preparation of the desulfurization dephosphorization agent of half steel:
It is passivated with passivating solution after 5kg graphite powder, 15kg calcium silicates, 5kg sodium carbonate, 5kg manganese dioxide, 20kg ferrum oxide, the mixing of 50kg active lime, obtains the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 83%wt.
Half steel is carried out desulfurization dephosphorization process by the desulfurization dephosphorization agent adopting above-mentioned 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 to seal, start to carry out desulfurization dephosphorization with nitrogen for carrier blowing desulfurization Dephosphorising agent when dephosphorization spray gun is down to half steel below the liquid level 100cm of dephosphorization to be desulfurization, spray gun is from the tank bottoms 500mm of half 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 desulfuring spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cm to carry out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, spray gun is from the tank bottoms 1500mm of half steel, magnesium powder consumption is 0.5kg/t half steel, injecting velocity controls at 3kg/min, desulfuring spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel phosphorus content be 0.059%, sulfur content be 0.060%, after desulfurization dephosphorization terminates, half steel phosphorus content is 0.012%, and dephosphorization rate reaches 79.7%, and sulfur content is 0.009%, and desulfurization degree is 85%.
Embodiment 2
The preparation of the desulfurization dephosphorization agent of half steel:
It is passivated with passivating solution after 5kg graphite powder, 5kg calcium silicates, 10kg sodium carbonate, 5kg manganese dioxide, 20kg ferrum oxide, the mixing of 55kg active lime, obtains the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 81%wt.
Half steel is carried out desulfurization dephosphorization process by the desulfurization dephosphorization agent adopting above-mentioned 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 to seal, start to carry out desulfurization dephosphorization with nitrogen for carrier blowing desulfurization Dephosphorising agent when dephosphorization spray gun is down to half steel below the liquid level 50cm of dephosphorization to be desulfurization, spray gun is from the tank bottoms 500mm of half 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 desulfuring spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 50cmcm to carry out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, spray gun is from the tank bottoms 500mm of half steel, magnesium powder consumption is 1kg/t half steel, injecting velocity controls at 5kg/min, desulfuring spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel phosphorus content be 0.068%, sulfur content be 0.072%, after desulfurization dephosphorization terminates, half steel phosphorus content is 0.019%, and dephosphorization rate reaches 71.0%, and sulfur content is 0.005%, and desulfurization degree is 93.0%.
Embodiment 3
The preparation of the desulfurization dephosphorization agent of half steel:
It is passivated with passivating solution after 5kg graphite powder, 5kg calcium silicates, 5kg sodium carbonate, 5kg manganese dioxide, 10kg ferrum oxide, the mixing of 70kg active lime, obtains the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 85%wt.
Half steel is carried out desulfurization dephosphorization process by the desulfurization dephosphorization agent adopting above-mentioned 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 to seal, start to carry out desulfurization dephosphorization with nitrogen for carrier blowing desulfurization Dephosphorising agent when dephosphorization spray gun is down to half steel below the liquid level 80cm of dephosphorization to be desulfurization, spray gun is from the tank bottoms 600mm of half 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 desulfuring spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 90cm to carry out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, spray gun is from the tank bottoms 1000mm of half steel, magnesium powder consumption is 0.8kg/t half steel, injecting velocity controls at 4kg/min, desulfuring spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel phosphorus content be 0.052%, sulfur content be 0.066%, after desulfurization dephosphorization terminates, half steel phosphorus content is 0.010%, and dephosphorization rate reaches 80.8%, and sulfur content is 0.008%, and desulfurization degree is 87.9%.
Embodiment 4
The preparation of the desulfurization dephosphorization agent of half steel:
It is passivated with passivating solution after 5kg graphite powder, 15kg calcium silicates, 8kg sodium carbonate, 6kg manganese dioxide, 16kg ferrum oxide, the mixing of 50kg active lime, obtains the desulfurization dephosphorization agent of half steel.
Wherein, in passive lime, CaO content is 85%wt.
Half steel is carried out desulfurization dephosphorization process by the desulfurization dephosphorization agent adopting above-mentioned 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 to seal, start to carry out desulfurization dephosphorization with nitrogen for carrier blowing desulfurization Dephosphorising agent when dephosphorization spray gun is down to half steel below the liquid level 60cm of dephosphorization to be desulfurization, spray gun is from the tank bottoms 500mm of half 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 desulfuring spray gun is fallen, spray gun to be desulfurization starts when being down to half steel liquid level 60cm to carry out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, spray gun is from the tank bottoms 800mm of half steel, magnesium powder consumption is 0.7kg/t half steel, injecting velocity controls at 4.5kg/min, desulfuring spray gun is promoted after deactivating magnesium powder winding-up amount reaches requirement, and carry out process of skimming.
In half steel phosphorus content be 0.071%, sulfur content be 0.056%, after desulfurization dephosphorization terminates, half steel phosphorus content is 0.010%, and dephosphorization rate reaches 85.9%, and sulfur content is 0.008%, and desulfurization degree is 85.7%.
Claims (12)
1. the desulfurization dephosphorization agent of half steel, it is characterized in that, the component of following weight portion obtain through transpassivation after mixing: graphite powder 5 parts, calcium silicates 10～20 parts, sodium carbonate 5～10 parts, manganese dioxide 5～10 parts, ferrum oxide 10～20 parts, active lime 40～70 parts.
2. the desulfurization dephosphorization agent of half steel according to claim 1, it is characterized in that, the component of following weight portion obtain through transpassivation after mixing: graphite powder 5 parts, calcium silicates 15 parts, sodium carbonate 8 parts, manganese dioxide 6 parts, ferrum oxide 16 parts, active lime 50 parts.
3. the desulfurization dephosphorization agent of half steel according to claim 1 and 2, it is characterised in that: described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, ferrum oxide purity > 95%；Described graphite powder, calcium silicates, sodium carbonate, manganese dioxide, ferrum oxide, active lime granularity equal < 100 order.
4. the desulfurization dephosphorization agent of half steel according to claim 1 and 2, it is characterised in that: described active lime obtains passive lime through transpassivation, and in described passive lime, the weight/mass percentage composition of CaO is 80%～90%.
5. the desulfurization dephosphorization agent of half steel according to claim 3, it is characterised in that: described active lime obtains passive lime through transpassivation, and in described passive lime, the weight/mass percentage composition of CaO is 80%～90%.
6. the desulfurization dephosphorization agent of half steel according to claim 4, it is characterised in that: in described passive lime, the weight/mass percentage composition of CaO is 85%～90%.
7. the desulfurization dephosphorization agent of half steel according to claim 5, it is characterised in that: in described passive lime, the weight/mass percentage composition of CaO is 85%～90%.
8. the preparation method of the desulfurization dephosphorization agent of the half steel described in any one of claim 1～7, it is characterised in that comprise the steps:
A, by each component according to proportioning mix, obtain mixed material；
B, mixed material passivating solution is passivated process.
9. the desulfurization dephosphorization agent of the half steel described in any one of claim 1～7 purposes in half steel desulfurization dephosphorization.
10. the desulfurization dephosphorization agent of half steel according to claim 9 purposes in half steel desulfurization dephosphorization, it is characterised in that: the consumption of the desulfurization dephosphorization agent of described half steel is 5～7kg/t half steel.
11. 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 is carried out with the desulfurization dephosphorization agent that nitrogen is the half steel according to any one of carrier winding-up claim 1～7, injecting velocity is 35～50kg/min, and the desulfurization dephosphorization agent consumption of half steel is 5～7kg/t half steel；Then carrying out desulfurization with nitrogen for carrier winding-up deactivating magnesium powder, injecting velocity is 3～5kg/min, and deactivating magnesium powder consumption is 0.5～1kg/t half steel；Winding-up carries out, after terminating, process of skimming.
12. the method for half steel desulfurization dephosphorization according to claim 11, it is characterised in that: described deactivating magnesium powder grade > 98%, density is 0.88～0.98g/cm3, < 2mm, is not more than 2% more than 1.2mm grade to granularity, is not more than 10% less than 0.15mm grade.
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| 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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Effective date of registration: 20171215 Address after: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Co-patentee after: Sichuan Pan Yan Technology Co., Ltd. Patentee after: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. Address before: 617000 Taoyuan street, Panzhihua, Sichuan, No. 90 Patentee before: Pangang Group Panzhihua Iron & Steel Research Institute Co., Ltd. |