CN106319151A - Molten iron desulphurization system and molten iron and iron slag separation device and method thereof - Google Patents
Molten iron desulphurization system and molten iron and iron slag separation device and method thereof Download PDFInfo
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- CN106319151A CN106319151A CN201610814104.5A CN201610814104A CN106319151A CN 106319151 A CN106319151 A CN 106319151A CN 201610814104 A CN201610814104 A CN 201610814104A CN 106319151 A CN106319151 A CN 106319151A
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- China
- Prior art keywords
- molten iron
- nitrogen
- iron
- shower nozzle
- scum
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
Abstract
The invention discloses a molten iron desulphurization system and a molten iron and iron slag separation device and method thereof. The molten iron and iron slag separation device comprises a vertical main beam, a lifting track, a drive device, a sprocket and chain transmission device, a nitrogen blowing lifting trolley, a nitrogen injection gun, a nitrogen blowing nozzle and a nitrogen supply system. The molten iron desulphurization system comprises an injection system, a slag skimming system, a tipping system, a molten iron tank, a molten iron trolley and the molten iron and iron slag separation device; and the molten iron and iron slag separation device is installed above the molten steel liquid level when the molten iron tank carries out slag skimming. The molten iron and iron slag separation method of the molten iron desulphurization system comprises the following steps that after desulphurization injection is finished, the nozzle is inserted into the upper layer of molten iron in the molten iron tank to carry out nitrogen blowing, iron slag is blown to the slag skimming position of the lower edge of the molten iron tank, and slag skimming operation is carried out. The device and the method can efficiently separate the molten iron and the iron slag produced in the desulphurization technology, thus the working efficiency of desulphurization equipment is improved, and iron loss caused by desulphurization and slag skimming is lowered.
Description
Technical field
The present invention relates to a kind of steel desulfurization technology, particularly relate to a kind of desulfurizing iron system and molten iron scum separates dress
Put and method
Background technology
Sulfur is harmful element in the pig iron, and it promotes the combination of ferrum and carbon, makes ferrum the most crisp, and is combined to low melting point with ferrum
Iron sulfide, makes the pig iron produce red brittleness and lower the mobility of ferrum liquid.To most of steel grades, sulfur can make its processing characteristics and make
Use performance depreciation.General steel grade requires that sulfur content must not exceed 0.05%, and fine steel grade requires that sulfur content must not exceed 0.02^
0.03, ultralow-sulfur steel requires that sulfur content is less than 0.005%.
Owing to iron ore and coke and injected fuel sulfur content are high, only it is difficult to reach low-sulfur steel by blast furnace and converter smelting
The sulfur-bearing index required with ultralow-sulfur steel, therefore developed Desulphurization of Pig Iron.At present, widely used molten iron desulfurizing method,
One is the spray gun by leaching people's molten iron Shen toward spraying into the injection desulfurization method of desulfurizing agent in molten iron, and another kind is to use rotating at molten iron
The agitator arm of refractory material, is thoroughly mixed the KR method carrying out desulfurization by desulfurizing agent and molten iron.
Either injection desulfurization method, or KR method, be required to skim in sweetening process.Desulfurization is with to skim be two
Hot metal pretreatment technology that is separate and that be closely connected again, the former determines the level processing terminal molten iron sulfur-bearing, and the latter
It is the important means removed from molten iron of high sulphur slag after desulfurization is processed, is determine into stove sulfur total amount main because of rope.Compare
For compare, slag skimming process seems even more important to crossing program control sulfur.If desulfurization product can not get effectively removing, then the best is de-
Sulfur technique can not play one's part to the full.Therefore, advanced slagging-off equipment is used with technique, system control sulfur to be produced into reduction
Originally it is the most necessary.
As it is shown in figure 1, existing blowing desulfurization system, mainly by injection system 1, system of skimming 2, rollover prevention system 3, molten iron
Tank 4, molten iron dolly 5 form, it is possible to be effectively controlled Sulfur Content in Hot Iron content, and its injection system is to Injection In Molten Iron magnesium powder, magnesium
Reaction of Salmon-Saxl in powder and molten iron forms scum, then processes scum by tumbling, taking off slag system.Yet with existing desulfurization
The restriction of functions of the equipments, during molten iron drossing, although rollover prevention system makes hot-metal bottle have certain angle, it is possible to carry out normal
Take off Slag treatment, but scum is attached on molten iron, make molten iron scum separation process treatment effeciency low, reduce desulphurization plant work
Efficiency, extends the normal cycle of Desulphuring Process of Molten Iron, increases the difficulty skimmed and desulphurization and slag skimming iron loss, directly enhances ton
The production cost of steel.
Summary of the invention
It is an object of the invention to provide a kind of desulfurizing iron system that can efficiently separate desulphurised hot metal scum and ferrum thereof
Water scum segregation apparatus and method.
For achieving the above object, the molten iron scum segregation apparatus designed by the present invention, for the molten iron of desulfurizing iron system
Scum separates, including vertical girder, fluctuating orbit, driving means, sprocket wheel chain gearing, nitrogen flushing lift cart, nitrogen spray
Blow rifle, nitrogen flushing shower nozzle and nitrogen air supply system；Described fluctuating orbit is vertically fixed on vertical girder；Described driving fills
Putting and be fixed on fluctuating orbit, described nitrogen flushing lift cart can slide up and down to be arranged on fluctuating orbit, described driving means
Lifting action is carried out by sprocket wheel chain actuator drives nitrogen flushing lift cart；Described nitrogen injection rifle and nitrogen air supply system
Being connected, described nitrogen flushing shower nozzle is arranged on the lower end of nitrogen injection rifle.
Preferably, described nitrogen injection rifle includes jet rifle nitrogen tube and winding-up rifle flame retardant coating, described winding-up rifle flame retardant coating
It is arranged on the outside of winding-up rifle nitrogen tube；Described nitrogen flushing shower nozzle includes shower nozzle nitrogen tube, shower nozzle flame retardant coating and spray orifice, described shower nozzle
Nitrogen tube includes tube axial and radial tubes, and described tube axial is axially arranged along nitrogen flushing shower nozzle, and described radial tubes is along nitrogen flushing shower nozzle
Be radially arranged, the lower end of described tube axial is connected to the centre of radial tubes coupled logical, and described spray orifice is arranged on shower nozzle
Flame retardant coating bottom is corresponding at the nozzle position of radial tubes two ends；Described shower nozzle nitrogen tube is connected with winding-up rifle nitrogen tube, described
Winding-up rifle nitrogen tube is connected with nitrogen air supply system.
Preferably, the bottom thickness of described shower nozzle flame retardant coating is more than upper thickness, i.e. shower nozzle flame retardant coating is vulnerable to molten iron
The bottom corroded is strengthened, and improves the service life of nitrogen flushing shower nozzle.
Preferably, the aperture of described spray orifice (23) is 5.5～6.5mm.More preferably 6mm.Above-mentioned aperture is test
The preferred value drawn, it is possible to obtain preferable scum separating effect, and be not easily blocked.
Preferably, described driving means is three-in-one reductor.Three-in-one reductor melts decelerator, motor and brake
In one, there is the features such as output parallel with motor shaft, compact conformation, big, low, the life-span length of stable working, noise of transmission moment of torsion.
Preferably, described sprocket wheel chain gearing includes drive sprocket, driven sprocket, driving chain, described drive chain
The rotating shaft of wheel is connected with the output shaft of described driving means, and described driving means is fixed on the top of fluctuating orbit, described driven
Sprocket wheel is fixed on the bottom of fluctuating orbit；Described driving chain is looped around on drive sprocket, driven sprocket respectively, described nitrogen flushing liter
Fall dolly is connected between the two ends of driving chain.Described driving chain is preferably duplex chain.
Invention also provides a kind of desulfurizing iron system applying molten iron scum segregation apparatus to carry out molten iron scum separation
System, including injection system, takes off slag system, rollover prevention system, hot-metal bottle, molten iron dolly and molten iron scum segregation apparatus；Described molten iron
The structure of scum segregation apparatus is as it was previously stated, it is arranged on the top of liquid steel level when hot-metal bottle is skimmed.
The molten iron scum separation method of above-mentioned desulfurizing iron system, after desulfuration injection is complete, inserts molten iron by shower nozzle
Molten iron upper strata in tank carries out nitrogen flushing, scum blows to edge under hot-metal bottle and carries out the position skimmed, and carry out skimming operation.
Preferably, this molten iron scum separation method comprises the steps:
1) by angle needed for hot-metal bottle tipping to operation of skimming；
2) nitrogen supply (NS) of nitrogen flushing shower nozzle is opened；
3) control nitrogen flushing lift cart to decline, make nitrogen flushing shower nozzle be inserted in the hot-metal bottle tumbled in the molten iron of upper strata；
4) carry out skimming operation.
Preferably, step 2) in, nitrogen pressure controls 0.25～0.3MPa.
Preferably, step 3) in, it is 400～600mm that nitrogen flushing shower nozzle inserts the degree of depth of molten iron.
The invention has the beneficial effects as follows: 1) molten iron scum separation efficiency is greatly improved, improve desulfurizing iron system
Work efficiency, it is ensured that tapping sulfur control and effect of skimming, improves the degree of purity of molten iron, it is ensured that product quality；2) shorten
Smelting converter environment cycle time, can directly reduce by 5 minutes time production cycle of every time skimming after transformation, reduce production technology mistake
The consumption of Cheng Nengyuan；3) every tank molten iron is down to 39.2kg/t by average iron loss of skimming from 42.6kg/t, the iron loss range of decrease 8.0%,
Significantly reduce a ton steel production cost；4) desulphurised hot metal scum segregation apparatus equipment investment cost is low, income effect obvious, popularization
Easily, it is adaptable to various blowing desulfurizations, stirring desulphurization system；5) workload and the labor intensity of operating personnel are decreased.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing desulfurizing iron system.
Fig. 2 is the structural representation of the desulfurizing iron system designed by the present invention.
Fig. 3 is the structural representation of molten iron scum segregation apparatus in Fig. 2.
Fig. 4 is the schematic diagram that in Fig. 3, molten iron scum segregation apparatus carries out taking off slag operation.
Fig. 5 is the main TV structure schematic diagram of nitrogen flushing shower nozzle in Fig. 3.
Fig. 6 be in Fig. 3 nitrogen flushing shower nozzle along the sectional structure schematic diagram of its axis.
Wherein: injection system 1, system of skimming 2, rollover prevention system 3, hot-metal bottle 4, molten iron dolly 5, molten iron scum segregation apparatus
6, vertical girder 7, fluctuating orbit 8, driving means 9, sprocket wheel chain gearing 10, drive sprocket 11, driven sprocket 12, transmission
Chain 13, nitrogen flushing lift cart 14, nitrogen injection rifle 15, winding-up rifle nitrogen tube 16, winding-up rifle flame retardant coating 17, nitrogen flushing shower nozzle 18,
Shower nozzle nitrogen tube 19, tube axial 20, radial tubes 21, shower nozzle flame retardant coating 22, spray orifice 23, adpting flange 24, nitrogen air supply pipe 25, nitrogen
Air pressure force regulating valve 26
Detailed description of the invention
The present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.
Being illustrated in figure 1 desulfurizing iron system of the prior art, its structure has been made specifically at background section
Bright, repeat no more in this.
As figures 2-6, the desulfurizing iron system designed by the present invention, including injection system 1, system of skimming 2, tumble
System 3, hot-metal bottle 4, molten iron dolly 5, also include molten iron scum segregation apparatus 6.Wherein:
Molten iron scum segregation apparatus 6 includes vertical girder 7, fluctuating orbit 8, driving means 9, sprocket wheel chain gearing
10, nitrogen flushing lift cart 14, nitrogen injection rifle 15, nitrogen flushing shower nozzle 18 and nitrogen air supply system.Fluctuating orbit 8 is vertically solid
It is scheduled on vertical girder 7.Driving means 9 selects the three-in-one reductor of DSZSA77-50 Y2-100L2-4E-I, and it is fixed on liter
On fall track 8, nitrogen flushing lift cart 14 can slide up and down to be arranged on fluctuating orbit 8, and driving means 9 is passed by sprocket wheel chain
Dynamic device 10 drives nitrogen flushing lift cart 14 to carry out lifting action.
Nitrogen injection rifle 15 includes jet rifle nitrogen tube 16 and winding-up rifle flame retardant coating 17, and winding-up rifle flame retardant coating 17 is arranged on spray
Blow the outside of rifle nitrogen tube 16.Nitrogen flushing shower nozzle 18 includes shower nozzle nitrogen tube 19, shower nozzle flame retardant coating 22 and spray orifice 23, shower nozzle nitrogen tube
19 include a tube axial 20 and a radial tubes 21, described tube axial 20 be vertically connected on radial tubes 21 center position and with
Its connection, tube axial 20 is axially arranged along nitrogen flushing shower nozzle 18, and radial tubes 21 is radially arranged in the lower end of tube axial 20 along shower nozzle, spray
Hole 23 is arranged on shower nozzle flame retardant coating 22 at the two ends mouth of pipe corresponding to radial tubes 21, and its aperture is 6mm.Shower nozzle flame retardant coating 22
Bottom thickness is about upper thickness about 2 times.The top of nitrogen flushing shower nozzle 18 is provided with adpting flange 24, by adpting flange 24 with
The lower end Flange joint of nitrogen injection rifle 15.Shower nozzle nitrogen tube 19 is connected with winding-up rifle nitrogen tube 16, rifle nitrogen tube 16 of jetting
It is connected with nitrogen air supply system.Nitrogen air supply system includes nitrogen air supply pipe 25 and nitrogen pressure force regulating valve 26, and nitrogen supplies
Pipe 25 is connected with winding-up rifle nitrogen tube 16.
Sprocket wheel chain gearing 10 includes drive sprocket 11, driven sprocket 12, driving chain 13, turning of drive sprocket 11
Axle is connected with the output shaft of driving means 9, and driving means 9 is fixed on the top of fluctuating orbit 8, and driven sprocket 12 is fixed on lifting
The bottom of track 8.Driving chain 13 is looped around on drive sprocket 11, driven sprocket 12 respectively, and nitrogen flushing lift cart 14 is connected to
Between the two ends of driving chain 13.Duplex chain 10A-2 selected by driving chain 13.
Installing fixed vertical girder 7 on the right side of injection system 1 at 1000mm, 300x300mm openning is opened on ground, for nitrogen flushing shower nozzle
18 extend in the hot-metal bottle 4 tumbled.
The molten iron scum separation method of above-mentioned desulfurizing iron system, comprises the steps:
1) molten iron is after Calx and magnesium powder mixed injection desulfurization, is tumbled to necessarily by rollover prevention system 3 by hot-metal bottle 4
Angle (molten iron must not overflow).
2) nitrogen pressure force regulating valve 26 is controlled 0.25～0.3MPa, keep this in stable condition.
3) control nitrogen flushing lift cart 14 to decline, make nitrogen flushing shower nozzle 18 insert in the hot-metal bottle 4 tumbled in the molten iron of upper strata, insert
Entering the degree of depth is 400～600mm, is positioned at the position in molten iron level (direction in Fig. 4) to the left, makes scum more blow to position of skimming
Put.
4) carry out skimming operation.When skimming, first the scum of hot-metal bottle mouth is taken off totally, owing to hot-metal bottle 4 is tumbled existence
Certain angle, the nozzle of nitrogen flushing shower nozzle is stirred in molten iron 400～600mm depths by nitrogen, blows out one piece bigger
Long-pending liquid level without slag, makes scum silica frost flow toward tank mouth, and after taking off to the greatest extent to scum, desulphurization and slag skimming technique terminates.
Claims (10)
1. a molten iron scum segregation apparatus, the molten iron scum for desulfurizing iron system separates, it is characterised in that: it includes hanging down
Straight girder (7), fluctuating orbit (8), driving means (9), sprocket wheel chain gearing (10), nitrogen flushing lift cart (14), nitrogen
Winding-up rifle (15), nitrogen flushing shower nozzle (18) and nitrogen air supply system；Described fluctuating orbit (8) is vertically fixed on vertical girder
(7) on；Described driving means (9) is fixed on fluctuating orbit (8), and described nitrogen flushing lift cart (14) can slide up and down to arrange
On fluctuating orbit (8), described driving means (9) drives nitrogen flushing lift cart (14) to enter by sprocket wheel chain gearing (10)
Row lifting action；Described nitrogen injection rifle (15) is connected with nitrogen air supply system, and described nitrogen flushing shower nozzle (18) is arranged on nitrogen
The lower end of winding-up rifle (15).
Molten iron scum segregation apparatus the most according to claim 1, it is characterised in that: described nitrogen injection rifle (15) includes spray
Blowing rifle nitrogen tube (16) and winding-up rifle flame retardant coating (17), described winding-up rifle flame retardant coating (17) is arranged on winding-up rifle nitrogen tube (16)
Outside；Described nitrogen flushing shower nozzle (18) includes shower nozzle nitrogen tube (19), shower nozzle flame retardant coating (22) and spray orifice (23), described shower nozzle nitrogen
Pipe (19) includes tube axial (20) and radial tubes (21), and described tube axial (20) is axially arranged along nitrogen flushing shower nozzle (18), described
Radial tubes (21) being radially arranged along nitrogen flushing shower nozzle (18), the lower end of described tube axial (20) is connected to the centre of radial tubes (21)
And coupled logical, described spray orifice (23) is arranged on shower nozzle flame retardant coating (22) bottom corresponding to radial tubes (21) two ends nozzle position
Place；Described shower nozzle nitrogen tube (19) is connected with winding-up rifle nitrogen tube (16), and described winding-up rifle nitrogen tube (16) supplies with nitrogen
System is connected.
Molten iron scum segregation apparatus the most according to claim 1, it is characterised in that: the bottom of described shower nozzle flame retardant coating (22)
Thickness is more than upper thickness.
Molten iron scum segregation apparatus the most according to claim 1, it is characterised in that: the aperture of described spray orifice (23) is 5.5
～6.5mm.
Molten iron scum segregation apparatus the most according to claim 1, it is characterised in that: described sprocket wheel chain gearing (10)
Including drive sprocket (11), driven sprocket (12), driving chain (13), the rotating shaft of described drive sprocket (11) drives dress with described
The output shaft putting (9) is connected, and described driving means (9) is fixed on the top of fluctuating orbit (8), and described driven sprocket (12) is fixed
Bottom in fluctuating orbit (8)；Described driving chain (13) is looped around on drive sprocket (11), driven sprocket (12) respectively, institute
State between the two ends that nitrogen flushing lift cart (14) is connected to driving chain (13).
6. a desulfurizing iron system, including injection system (1), takes off slag system (2), rollover prevention system (3), hot-metal bottle (4) and ferrum
Water dolly (5), it is characterised in that: also include molten iron scum segregation apparatus (6) according to any one of Claims 1 to 5, described
Molten iron scum segregation apparatus (6) is arranged on the surface of liquid steel level when hot-metal bottle (4) is skimmed.
7. the molten iron scum separation method of a desulfurizing iron system, it is characterised in that: after desulfuration injection is complete, by shower nozzle
The molten iron upper strata inserted in hot-metal bottle (4) carries out nitrogen flushing, scum blows to edge under hot-metal bottle (4) and carries out the position skimmed, enter
Capable operation of skimming.
The molten iron scum separation method of desulfurizing iron system the most according to claim 7, it is characterised in that: include walking as follows
Rapid:
1) hot-metal bottle (4) is tumbled to angle needed for operation of skimming；
2) nitrogen supply (NS) of nitrogen flushing shower nozzle (18) is opened；
3) control nitrogen flushing lift cart (14) to decline, make nitrogen flushing shower nozzle (18) be inserted into hot-metal bottle (4) the interior upper strata molten iron tumbled
In；
4) carry out skimming operation.
The molten iron scum separation method of desulfurizing iron system the most according to claim 7, it is characterised in that: step 2) in,
Nitrogen pressure controls 0.25～0.3MPa.
The molten iron scum separation method of desulfurizing iron system the most according to claim 7, it is characterised in that: step 3) in,
It is 400～600mm that nitrogen flushing shower nozzle (18) inserts the degree of depth of molten iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814104.5A CN106319151A (en) | 2016-09-09 | 2016-09-09 | Molten iron desulphurization system and molten iron and iron slag separation device and method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610814104.5A CN106319151A (en) | 2016-09-09 | 2016-09-09 | Molten iron desulphurization system and molten iron and iron slag separation device and method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106319151A true CN106319151A (en) | 2017-01-11 |
Family
ID=57787858
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610814104.5A Pending CN106319151A (en) | 2016-09-09 | 2016-09-09 | Molten iron desulphurization system and molten iron and iron slag separation device and method thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07216430A (en) * | 1994-02-02 | 1995-08-15 | Nippon Steel Corp | Molten steel production method and top blowing lance for molten metal refining |
| CN102382922A (en) * | 2010-08-31 | 2012-03-21 | 上海梅山钢铁股份有限公司 | Gas-blowing and slag-removing device and slag-removing method |
| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN204138696U (en) * | 2014-11-05 | 2015-02-04 | 武汉钢铁(集团)公司 | The air blowing of assisting slagging-off for molten iron gathers slag spray gun |
| CN104831013A (en) * | 2015-05-28 | 2015-08-12 | 中冶赛迪工程技术股份有限公司 | Slag blow-removal mechanism |
-
2016
- 2016-09-09 CN CN201610814104.5A patent/CN106319151A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07216430A (en) * | 1994-02-02 | 1995-08-15 | Nippon Steel Corp | Molten steel production method and top blowing lance for molten metal refining |
| CN102382922A (en) * | 2010-08-31 | 2012-03-21 | 上海梅山钢铁股份有限公司 | Gas-blowing and slag-removing device and slag-removing method |
| CN103114177A (en) * | 2013-03-12 | 2013-05-22 | 武汉钢铁(集团)公司 | Gas-blowing and slag-gathering spray gun for assisting slag-off of molten iron and using method of spray gun |
| CN204138696U (en) * | 2014-11-05 | 2015-02-04 | 武汉钢铁(集团)公司 | The air blowing of assisting slagging-off for molten iron gathers slag spray gun |
| CN104831013A (en) * | 2015-05-28 | 2015-08-12 | 中冶赛迪工程技术股份有限公司 | Slag blow-removal mechanism |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170705 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Applicant after: Wuhan iron and Steel Company Limited Address before: 430083 Qingshan District, Hubei, Wuhan Applicant before: WUHAN IRON AND STEEL CORPORATION |
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Application publication date: 20170111 |
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