CN109072320A - The sulfur method and desulfurizer of molten iron - Google Patents
The sulfur method and desulfurizer of molten iron Download PDFInfo
- Publication number
- CN109072320A CN109072320A CN201780025893.7A CN201780025893A CN109072320A CN 109072320 A CN109072320 A CN 109072320A CN 201780025893 A CN201780025893 A CN 201780025893A CN 109072320 A CN109072320 A CN 109072320A
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- CN
- China
- Prior art keywords
- desulfurizing agent
- molten iron
- nozzle
- refining
- stove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- 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
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Furnace Charging Or Discharging (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
A kind of technology carrying out desulfurization with higher desulfurization degree in converter tapping is provided.It uses air blowing equipment (6), from refining vessel (1) to casting ladle (2) tap when from blow nozzle (3) to tapping stream (11) blow desulfurizing agent (7), air blowing equipment (6) includes: to blow nozzle (3), is set to investment sliding slot (8)；Container (hopper) (4) stores desulfurizing agent；And piping (5), nozzle (3) and container (hopper) (4) connection will be blowed.
Description
Technical field
The present invention relates to the sulfur method of molten iron and desulfurizers.
Background technique
In the past, when the low-sulfur steel to such as [S]≤24ppm carries out melting, in order to mitigate the desulfurization in double refining
Load, when tapping from converter to casting ladle, by putting into desulfurizing agent and deoxidier from investment sliding slot to casting ladle simultaneously, to carry out
Desulfurization.But, desulfurizing agent is difficult to be involved in molten steel, and therefore, desulfurization degree is lower.
Disclose that there are as below methods in patent document 1: by by deoxidier, desulfurizing agent and slag modifiers into tapping
Molten steel addition, to carry out desulfurization.Agitation energy possessed by tapping stream when this method utilizes converter tapping to desulfurizing agent and
Molten steel is stirred and reacts desulfurizing agent and molten steel.
Disclose that there are as below methods in patent document 2: by the flux of the powdery after heating via spray gun towards from converter to
The molten steel of casting ladle tapping blows, to refine to molten steel.
Existing technical literature
Patent document
Patent document 1: Japanese Unexamined Patent Publication 8-225824 bulletin
Patent document 2: Japanese Unexamined Patent Publication 2005-187901 bulletin
Summary of the invention
Problems to be solved by the invention
Technical solution disclosed in patent document 1, which flows possessed agitation energy merely with tapping, keeps desulfurizing agent and molten steel anti-
It answers.Therefore, mixing power is insufficient and can not effectively utilize desulfurizing agent, and therefore, desulfurization degree is lower.
In addition, it is effective for so that the partial size of desulfurizing agent is attenuated in order to improve desulfurization degree.But, disclosed in the patent document 1
Technical solution in, if a part of desulfurizing agent is inevitably dispersed and is dissipated using the desulfurizing agent (~1mm degree) of particulate
It loses.The reduction, desulfurization of the stock utilization of generation desulfurizing agent is bad as a result,.
In order to implement technical solution disclosed Patent Document 2, as documented by the paragraph 0033 and Fig. 1 of patent document 2
Like that, in order to make spray gun 2 close to injection stream 18, change the tilt angle of spray gun 2, and move spray gun 2 along up and down direction
And inclination, need to put into independently newly setting spray gun mobile device (not shown) of device 16 with raw material.Therefore, in equipment cost
It rises.In addition, it is also desirable to spray gun 2 be independently configured near converter 12 relative to raw material investment device 16, therefore, equipment is big
Type.
The purpose of the present invention is to provide one kind to come out of the stove from refining furnace (such as converter) to refining vessel (such as casting ladle)
When can with higher desulfurization degree carry out molten iron desulfurization technology.
The solution to the problem
The present invention is a kind of sulfur method of molten iron, when making molten iron come out of the stove from refining furnace to refining vessel, to one side
The stream addition desulfurizing agent of coming out of the stove that down position flows down on one side is changed, in the sulfur method of the molten iron,
Using air blowing equipment, which, which includes, blows nozzle, is installed on to put into the inside of refining vessel
Raw material and the investment sliding slot for keeping incidence variable, this blows nozzle and releases desulfurizing agent；Tank stores desulfurizing agent；With
And desulfurizing agent feed path, the desulfurizing agent for being stored in tank is supplied to nozzle is blowed,
Make to blow nozzle on one side and blow the blowing direction of desulfurizing agent and follows the down position of stream of coming out of the stove together with investment sliding slot
Variation, blow desulfurizing agent to stream of coming out of the stove from blowing nozzle on one side.
According to another viewpoint, the present invention is a kind of desulfurizer of molten iron, make molten iron from refining furnace to refining vessel
To the stream addition desulfurizing agent of coming out of the stove flowed down while changing down position when coming out of the stove, wherein
The desulfurizer of the molten iron has air blowing equipment, which, which includes, blows nozzle, is installed in order to essence
The investment sliding slot for refining the inside investment raw material of container and keeping incidence variable, this blows nozzle and releases desulfurizing agent；Tank,
It stores desulfurizing agent；And desulfurizing agent feed path, the desulfurizing agent for being stored in tank is supplied to nozzle is blowed,
The blowing direction for blowing nozzle blowout desulfurizing agent can be changed together with investment sliding slot, and blowing nozzle can be come out of the stove with following
The mode of the variation of the down position of stream blows the desulfurizing agent.
At these, present invention it is preferred that, the position for blowing desulfurizing agent to stream of coming out of the stove is than the plug for outlet from refining furnace
The upper position of 1/2 height and position between the liquid level of molten iron in refining vessel.
At these, present invention it is preferred that, the partial size of desulfurizing agent is 0.5mm~1.0mm.
At these present invention it is preferred that, to coming out of the stove at the beginning of coming out of the stove from molten iron from refining furnace to refining vessel
At the end of during 3/4 or more in a period of, blow desulfurizing agent to stream of coming out of the stove from nozzle is blowed.
Present invention it is preferred that, and simultaneously, or start prior to it when blowing desulfurizing agent since blowing nozzle at these
When, start to put into deoxidier from investment sliding slot to the inside of refining vessel.
In these present invention, illustrating the molten iron is molten steel.In this case, illustrating the refining furnace is that progress is secondary
The refining furnace of progress initial refining in the steel processed of refining, specifically converter, illustrating the refining vessel is casting ladle.
The effect of invention
According to the present invention, desulfurizing agent is blowed to the stream of coming out of the stove flowed down, it therefore, can be using desulfurizing agent relative to stream of coming out of the stove
The stream that blows and come out of the stove mixing power and so that desulfurizing agent is involved in increase to molten iron.Therefore, it can be improved desulfurization degree.
In addition, if the liquid level of the melt from investment sliding slot etc. into refining vessel adds desulfurizing agent as in the past, not
The most desulfurizing agent dust formation of scorification, lead to the problem of the loss of desulfurizing agent, on operating environment etc..Therefore, it is impossible to use particulate
Desulfurizing agent.But, according to the present invention, the scorification speed of desulfurizing agent is higher, even the desulfurizing agent of particulate, can also have no to lose
Ground blows, and therefore, can more improve desulfurization degree.
Moreover, the present invention only with will release desulfurizing agent blow nozzle be mounted on existing investment sliding slot can be real
It applies.Thus, according to the present invention, no setting is required spray gun mobile device disclosed Patent Document 2, therefore, can prevent equipment at
Rising originally, the enlargement of equipment.
Detailed description of the invention
Fig. 1 is the explanatory diagram for indicating the structure of desulfurizer of molten steel of the invention.
Fig. 2 is to have used desulfurizing agent CaO-CaF for example of the present invention and previous example expression2、CaO-Al2O3The case where it is de-
The chart of sulphur rate.
Specific embodiment
In the following description, by taking following situation as an example: molten iron is molten steel, and refining furnace is in the steel processed for carrying out double refining
Middle refining furnace, that is, the converter for carrying out initial refining, also, refining vessel is casting ladle.In addition, in the following description, as long as no
Special declaration, " % " about chemical composition or concentration refer to " quality % ".
1. desulfurizer 0 of the invention
Fig. 1 is the explanatory diagram for indicating the structure of desulfurizer 0 of molten steel of the invention.
As shown in Figure 1, desulfurizer 0 be in the steel processed for carrying out double refining when tapping after initial refining to
The device of the addition desulfurizing agent 7 of molten steel 11.Desulfurizer 0 has air blowing equipment 6.Air blowing equipment 6 is to from having carried out initial refining
Converter 1 blows desulfurizing agent 7 to the tapping stream 11 that the casting ladle 2 for carrying out double refining is tapped and flowed down.In addition, initial refining is used
Converter 1 pattern, type it is not restricted.
Air blowing equipment 6, which has, blows nozzle 3, tank 4 and desulfurizing agent feed path 5.It blows nozzle 3 and is installed on throwing
Enter sliding slot 8.Investment sliding slot 8 is configured to, and incidence dimensionally can be changed, so as to (such as de- to the inside of casting ladle 2 investment alloy
Oxygen agent).It puts into sliding slot 8 and uses existing investment sliding slot.
It blows nozzle 3 and releases desulfurizing agent 11, blow desulfurizing agent to the tapping stream 11 flowed down while changing down position
7.Tank 4 stores desulfurizing agent 7.Desulfurizing agent feed path 7 is for example to be piped, and will be stored in the desulfurizing agent 11 of tank 4
It is supplied to nozzle 3 is blowed.
It is installed on investment sliding slot 8 by the way that nozzle 3 will be blowed, so that the direction for being configured to the jet port of desulfurizing agent 7 is variable.By
This, desulfurizing agent 7 can be blowed in a manner of following the variation of down position of tapping stream 11 by blowing nozzle 3.That is, blowing nozzle 3
It is configured to, the range of the injection direction (blowing direction) of desulfurizing agent 7 in the mobility scale for the down position for covering tapping stream 11
It is interior variable.
Blow the pattern of nozzle, type is not particularly limited.Desulfurizing agent disperses in order to prevent, and nozzle diameter is preferably
200mm~300mm.
2. sulfur method of the invention
The present invention is using the low-sulfur steel of [S]≤24ppm or so as object.As shown in Figure 1, the present invention is from converter 1 to casting ladle 2
Air blowing equipment 6 is used when tapping, blows desulfurizing agent 7 to tapping stream 11 from nozzle 3 is blowed.
By 11 blowing desulfurizing agent 7 to tapping stream from blowing nozzle 3, can effectively flexibly with the energy blowed and go out
The agitation energy of steel stream 11.Therefore, be involved in increase of the desulfurizing agent 7 to tapping stream 11 can be made, desulfurization degree improves.
In the past, when adding desulfurizing agent to the liquid level of molten steel from investment sliding slot etc., as described above, not being available the de- of particulate
Sulphur agent.In contrast, according to the present invention, desulfurizing agent 7 is involved in increase to tapping stream 11, and therefore, being able to use such as partial size is
The desulfurizing agent 7 of the particulate of 0.5mm~1.0mm.The granularity of desulfurizing agent 7 is thinner, then the surface area for facilitating desulphurization reaction increases
Add, therefore, desulfurization degree can be further increased.If the partial size of desulfurizing agent 7 is less than 0.5mm, the most desulfurizing agent dust of non-scorification
Change, on the other hand, if the partial size of desulfurizing agent 7 is greater than 1.0mm, desulfurization degree is reduced.In this way, according to the present invention, particulate can be blowed
Desulfurizing agent 7, desulfurization degree improve.
The composition of desulfurizing agent 7 is normally used as the composition of desulfurizing agent, is not particularly limited.Preferably, it illustrates
CaO monomer adds a part of CaF to CaO2、Al2O3Made of form CaO-CaF2、CaO-Al2O3.The additive amount of desulfurizing agent
It is not restricted.
At this time, it is preferred that the blowing direction for blowing nozzle 3 is made to follow the tapping flowed down while changing down position
Stream 11 persistently blows desulfurizing agent 7 to tapping stream 11.In general, the bore of the tapping hole 13 of converter 1 is 150mm~250mm,
The bore of tapping hole is 1100mm~1300mm.Therefore, compared with hot metal flow, tapping stream 11 is relatively thin.Moreover, due to converter 1
Deflection angle, the local stoppages of tapping hole 13 etc., tapping stream 11 flows down while changing the down position in horizontal plane.Cause
This, the blowing direction of desulfurizing agent 7 is easy to deviate relative to tapping stream 11, and desulfurization degree is easy to reduce.In the present invention, make to blow spray
The blowing direction of mouth 3 follows tapping stream 11, therefore, can prevent the loss of desulfurizing agent 7.
It is further preferred, that flowing the position that blows that 11 blow desulfurizing agent 7 to tapping is than in from tapping hole 13 to casting ladle 2
Molten steel liquid level 12 distance between the upper position of 1/2 height and position.The reason is that thereby, it is possible to from more
High position puts into desulfurizing agent 7 to liquid level 12 together with tapping stream 11, also can improve mixing power using position energy.
Blowing for desulfurizing agent 7 is able to use non-active gas.As non-active gas, preferably Ar gas or N2Gas
Body.The jet pressure of desulfurizing agent 7 is preferably 0.5MPa~1.0MPa.
Preferably, desulfurizing agent 7 is from blowing the blowing and tapping from molten steel from converter 1 to casting ladle 2 to tapping stream 11 of nozzle 3
At the beginning of in a period of 3/4 or more during at the end of tapping, most preferably carried out during entire, to improve
Desulfurization degree.
It is further preferred, that with when blowing desulfurizing agent since blowing nozzle 3 simultaneously, or prior at this point, starting from investment
Sliding slot 8 puts into deoxidier to the inside of casting ladle 2.Desulphurization reaction is reduction reaction shown in following formulas (1).Therefore, if molten steel
In the concentration of oxygen, the concentration of oxide as FeO, MnO in slag it is higher, then since back reaction returns sulphur, and make desulfurization
Rate reduces.By also putting into deoxidier from investment sliding slot 8, make the concentration of the oxygen in molten steel, the concentration of oxide in slag drop
It is low, so as to further increase desulfurization degree.
CaO+ [S]=CaS+ [O] ... (1)
Deoxidier is able to use to casting ladle 2 without blowing to tapping stream 11 and places, flows the various sides such as 11 additions to tapping
Method.In addition, deoxidier is able to use usually used deoxidier, it is not particularly limited.For example, it is preferable to the deoxidation containing Al
Agent.Oxygen amount suitably determines in the additive amount of deoxidier molten steel as needed, not restricted.
Moreover, the present invention is only mounted on 8 energy of investment sliding slot set with the nozzle 3 that blows that will release desulfurizing agent 7
It is enough to implement.Thus, according to the present invention, no setting is required therefore spray gun mobile device disclosed Patent Document 2 can prevent from setting
The rising of standby cost, the enlargement of equipment.
Embodiment
Using desulfurizer 0 of the invention shown in FIG. 1 and from desulfurizer 0 remove air blowing equipment 6 after previous example
Desulfurizer finds out and carrys out desulfurization degree.That is, in the molten steel 7 for having carried out the blowing (initial refining) based on converter 1 using customary means
When tapping, desulfurizing agent is added, is found out according to [S] of tapping front and back come desulfurization degree.
The size of the tapping hole 13 of converter 1 is 250mm.Desulfurizing agent 7 is blown to tapping stream 11 by using blowing device 0
It send, is added to desulfurizing agent 7.The nozzle diameter for blowing nozzle 3 is 200mm.Use Ar gas as the carrier gas of desulfurizing agent 7.
In desulfurizer 0, desulfurizing agent 7 blows nozzle 3 with the blowing direction and horizontal plane of the desulfurizing agent 7 in horizontal plane
The interior consistent mode of incidence from investment sliding slot 8 is fixed and is configured at using welding, the such appropriate means of fastening
Put into the center upper portion of sliding slot 8.
Thus, incidence is altered to the direction towards casting ladle 2 with operation investment sliding slot 8, nozzle 3 is blowed certainly and blows
The direction of desulfurizing agent 7 is sent to be altered to the direction towards tapping stream 11.It is tapping as a result, from converter 1 to casting ladle 2 from molten steel 11
To the entire period at the end of tapping when beginning, the variation of the down position of tapping stream 11 is followed on one side, is persistently blowed on one side
Desulfurizing agent 7.
Desulfurizing agent 7 is set as to the position that blows of tapping stream 11 than the height position from tapping hole 13 to 1/2 liquid level 12
Rest against the position of upside.
On the other hand, as previous example, desulfurizing agent has been put into from investment sliding slot 8 to the molten steel of the inside of casting ladle 2.
The respective condition of example and previous example of the present invention is shown in table 1.
[table 1]
Table 1
As alloying component, Mn, Si alloy are put into as deoxidier and has put into the Al of 3kg/t.Molten steel is shown in table 1
The chemical composition and liquid steel temperature of (after tapping).
For desulfurizing agent, example and previous example of the present invention all employ CaO-CaF2、CaO-Al2O3Both.For desulfurizing agent
Partial size, be~5mm in previous example, be 0.5mm~1.0mm in example of the present invention.The input amount of desulfurizing agent is 5kg/t.
In order to hold the S concentration before and after desulfurization, is sampled before and after tapping, sulphur concentration in molten steel [S] is carried out
Confirmation.Later, the desulfurization degree (%) of tapping front and back is found out based on each sulphur concentration.If by [S]0Be set as tapping preceding sulphur concentration, by [S]1
It is set as sulphur concentration after tapping, then desulfurization degree is by as [S]0-[S]1)/[S]0× 100 (%) are found out.
Fig. 2 is to have used desulfurizing agent CaO-CaF for example of the present invention and previous example expression2、CaO-Al2O3The case where it is de-
The chart of sulphur rate.Black column in the chart of Fig. 2 is example of the present invention, and Bai Zhu is previous example.
As shown in the chart of Fig. 2, desulfurizing agent CaO-CaF is being used2、CaO-Al2O3Either case under, example of the present invention
Desulfurization degree be all about 1.2 times of desulfurization degree of comparative example.
In addition, the desulfurizing agent 7 that partial size is 0.5~1mm is put into casting ladle 2 from investment sliding slot 8.But, non-scorification is most
7 dust formation of desulfurizing agent does not find that molten steel into casting ladle 2 suspends, and visual confirmation is not to mixing.
Description of symbols
0, desulfurizer of the invention；1, refining furnace (converter etc.)；2, refining vessel (casting ladle)；3, nozzle is blowed；4, hold
Device (hopper)；5, it is piped；6, air blowing equipment；7, desulfurizing agent；8, sliding slot is put into；11, tapping stream；12, liquid level；13, tapping hole.
Claims (9)
1. a kind of sulfur method of molten iron changes to one side when making molten iron come out of the stove from refining furnace to refining vessel and flows down position
The stream addition desulfurizing agent of coming out of the stove flowed down on one side is set, in the sulfur method of the molten iron,
Using air blowing equipment, which, which includes, blows nozzle, is installed on to put into the inside of the refining vessel
Raw material and the investment sliding slot for keeping incidence variable, this blows nozzle and releases desulfurizing agent；Tank stores desulfurizing agent；With
And desulfurizing agent feed path, the desulfurizing agent for being stored in the tank is blowed into nozzle supply to described,
Make on one side it is described blow nozzle blow the desulfurizing agent blowing direction followed together with the investment sliding slot described in come out of the stove
The variation of the down position of stream blows nozzle and blows the desulfurizing agent to the stream of coming out of the stove from described on one side.
2. the sulfur method of molten iron according to claim 1, wherein
The position for blowing the desulfurizing agent to the stream of coming out of the stove is than in the plug for outlet from the refining furnace to the refining vessel
Molten iron liquid level between the upper position of 1/2 height and position.
3. the sulfur method of molten iron according to claim 1 or 2, wherein
The partial size of the desulfurizing agent is 0.5mm~1.0mm.
4. the sulfur method of molten iron described in any one of claim 1 to 3, wherein
At the beginning of coming out of the stove from the molten iron from the refining furnace to the refining vessel to this come out of the stove at the end of during
3/4 or more in a period of, blow nozzle from described and blow the desulfurizing agent to the stream of coming out of the stove.
5. the manufacturing method of molten iron according to any one of claims 1 to 4, wherein
With since it is described blow nozzle blow the desulfurizing agent when simultaneously, or when starting prior to it, start from investment cunning
Slot puts into deoxidier to the inside of the refining vessel.
6. the sulfur method of molten iron according to any one of claims 1 to 5, wherein
The molten iron is molten steel.
7. the sulfur method of molten iron according to claim 6, wherein
The refining furnace is the refining furnace of the progress initial refining in the steel processed for carry out double refining.
8. the sulfur method of molten iron according to claim 7, wherein
The refining furnace is converter, and the refining vessel is casting ladle.
9. a kind of desulfurizer of molten iron changes position under stream to one side when making molten iron come out of the stove from refining furnace to refining vessel
Set the stream addition desulfurizing agent of coming out of the stove flowed down on one side, wherein
The desulfurizer of the molten iron has air blowing equipment, which, which includes, blows nozzle, is installed in order to the essence
The investment sliding slot for refining the inside investment raw material of container and keeping incidence variable, this blows nozzle and releases desulfurizing agent；Tank,
It stores desulfurizing agent；The desulfurizing agent for being stored in the tank is blowed nozzle supply to described by desulfurizing agent feed path,
It is described blow nozzle and blow the blowing direction of the desulfurizing agent can be changed together with the investment sliding slot, it is described to blow nozzle energy
The desulfurizing agent is blowed in a manner of enough variations to follow the down position of the stream of coming out of the stove.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016086923 | 2016-04-25 | ||
| JP2016-086923 | 2016-04-25 | ||
| PCT/JP2017/016091 WO2017188159A1 (en) | 2016-04-25 | 2017-04-21 | Molten iron desulfurization method and desulfurization apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109072320A true CN109072320A (en) | 2018-12-21 |
| CN109072320B CN109072320B (en) | 2021-01-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780025893.7A Active CN109072320B (en) | 2016-04-25 | 2017-04-21 | Method and apparatus for desulfurizing molten iron |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6521177B2 (en) |
| KR (1) | KR102300458B1 (en) |
| CN (1) | CN109072320B (en) |
| TW (1) | TWI652350B (en) |
| WO (1) | WO2017188159A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110747315A (en) * | 2019-11-18 | 2020-02-04 | 张家港宏昌钢板有限公司 | High-efficient molten iron desulphurization unit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108588330A (en) * | 2018-06-07 | 2018-09-28 | 王琼 | A kind of molten steel automatic carburetting system and method in tapping process |
| KR102334956B1 (en) | 2018-11-01 | 2021-12-02 | 주식회사 엘지화학 | Ramp for vehicle and manufacturing method of same |
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2017
- 2017-04-21 JP JP2018514569A patent/JP6521177B2/en active Active
- 2017-04-21 KR KR1020187033618A patent/KR102300458B1/en active IP Right Grant
- 2017-04-21 TW TW106113677A patent/TWI652350B/en not_active IP Right Cessation
- 2017-04-21 CN CN201780025893.7A patent/CN109072320B/en active Active
- 2017-04-21 WO PCT/JP2017/016091 patent/WO2017188159A1/en active Application Filing
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| CN110747315A (en) * | 2019-11-18 | 2020-02-04 | 张家港宏昌钢板有限公司 | High-efficient molten iron desulphurization unit |
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| TWI652350B (en) | 2019-03-01 |
| CN109072320B (en) | 2021-01-05 |
| JP6521177B2 (en) | 2019-05-29 |
| KR20180132918A (en) | 2018-12-12 |
| JPWO2017188159A1 (en) | 2018-09-27 |
| WO2017188159A1 (en) | 2017-11-02 |
| KR102300458B1 (en) | 2021-09-09 |
| TW201800583A (en) | 2018-01-01 |
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