CN107354272A - A kind of RH rectification systems and its method of refining using cleanser core-spun yarn - Google Patents
A kind of RH rectification systems and its method of refining using cleanser core-spun yarn Download PDFInfo
- Publication number
- CN107354272A CN107354272A CN201710643530.1A CN201710643530A CN107354272A CN 107354272 A CN107354272 A CN 107354272A CN 201710643530 A CN201710643530 A CN 201710643530A CN 107354272 A CN107354272 A CN 107354272A
- Authority
- CN
- China
- Prior art keywords
- cleanser
- core
- spun yarn
- molten steel
- refining
- 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.)
- Withdrawn
Links
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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/068—Decarburising
-
- 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
- C21C7/10—Handling in a vacuum
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a kind of RH rectification systems and its method of refining using cleanser core-spun yarn, belong to RH refining techniques field.RH refining furnaces of the present invention include ladle, vacuum chamber and vacuum device, and the vacuum chamber is arranged at the top of ladle, and the tedge and down-comer of vacuum chamber bottom are inserted in ladle；Line feeding unit includes drive mechanism, steady wheel group and line feeding conduit, and the driving wheel and driven pulley of drive mechanism are correspondingly arranged, and drive mechanism is used to drive cleanser core-spun yarn, and steady wheel group is arranged between drive mechanism and line feeding conduit；The conduit outlet of line feeding conduit is arranged at the top of tedge；Cleanser core-spun yarn feeds RH refining furnace cleaning molten steels by line feeding unit.Cleanser core-spun yarn of the present invention is contacted on the top of tedge with molten steel, and so as to promote the mixed effect of cleanser core-spun yarn and molten steel, cleanser core-spun yarn can promote growing up, float, removing for field trash, and then improve molten steel cleanness.
Description
Technical field
The invention belongs to RH refining techniques field, is refined more specifically to a kind of RH using cleanser core-spun yarn
System and its method of refining.
Background technology
The performance of steel depends primarily on the chemical composition and tissue of steel.The presence of steel inclusion, destroys steel matrix
Continuity, the inhomogeneities of the tissue of steel is caused, to the ductility of steel, intensity, toughness, fatigue behaviour, finish, corrosion resistance
Energy, welding performance and electromagnetic performance can all have a huge impact.Nozzle clogging, nozzle clogging can be also caused in casting process
Production and slab quality to casting process have a great impact.Therefore, steel research person in various countries' puts into larger energy and is directed to
The research that steel inclusion removes, also achieves huge achievement in terms of research in terms of field trash.
Cored wire technology is a kind of external refining means to grow up on the basis of spraying metallurgy technology the eighties.Cored
Line is applied to steel-making and casting.Core-spun yarn is advantageous to adjust and controls the content of oxidizable element and trace element, can larger amplitude
Degree improves yield of alloy, reduces smelting cost, shortens the heat, is precisely controlled to point.Plant equipment letter needed for line feeding
Single reliable, floor space is few, and core-spun yarn realizes the accurate control that molten steel adds material.The present invention have developed a kind of using net
The RH rectification systems of agent core-spun yarn, and then the effect of liquid steel refining can be improved.
Through retrieval, innovation and creation it is entitled：Core-spun yarn and method (application number for molten steel alloying：
201110120993.2 the applying date：2011-05-11), the technical scheme of the invention can improve vanadium recovery, prevent card line and break
The generation of line, it is easy to the feeding of core-spun yarn.The core-spun yarn includes sandwich layer and crust, and sandwich layer contains alloy of vanadium nitride and silico-calcium closes
Gold.This method mainly adds calcium-silicon in the sandwich layer of core-spun yarn, and core-spun yarn then is fed into molten steel.By in sandwich layer
Calcium-silicon is added, the free oxygen content in molten steel can be reduced, reduce the possibility that vanadium is combined with oxygen, so that more vanadium
Alloying is participated in, and then improves the rate of recovery of vanadium.But this method is limited to the clean-up effect of molten steel, do not reduce fine in steel
The fusing point of field trash, it is impossible to promote growing up, float, removing for field trash well, be unfavorable for further improving the product of product made from steel
Matter.
In addition, innovation and creation is entitled：RH vacuum refining systems and sulfur method (application number for molten steel desulfurizing：
201410203660.X the applying date：2014-05-14), including vacuum chamber and tedge and down-comer, tedge be provided with to
Few lifting gas blowout pipe；At least one injection tank, built with desulfurization powder, injection tank has charging aperture and discharging opening, enters
Material mouth is higher than discharging opening, and discharging opening is connected by pipeline with lifting gas blowout pipe, and discharging opening is provided with outlet valve；Lift gas and send dress
Put, be connected with the pipeline with the blowing gas into RH equipment for vacuum refining, the desulfurization powder in injection tank is sent out by lifting gas
The gas for sending device to be blown is blown into RH equipment for vacuum refining.According to the RH vacuum refining systems for molten steel desulfurizing of the present invention
The desulfuration efficiency of molten steel can be significantly improved.Although this method has preferable desulfurized effect, to the clean-up effect of molten steel
It is limited.
The content of the invention
1. invention technical problems to be solved
It is an object of the invention to overcome in the prior art, existing method of refining is difficult to effective cleaning molten steel not
Foot, there is provided a kind of RH rectification systems and its method of refining using cleanser core-spun yarn,
A kind of RH rectification systems using cleanser core-spun yarn therein, fed by cleanser core-spun yarn by line feeding unit
Enter RH refining furnace cleaning molten steels, cleanser inner core is used for cleaning molten steel；Cleanser core-spun yarn can promote the growing up of field trash, on
Floating, removal, and then improve molten steel cleanness；
A kind of method of refining using cleanser core-spun yarn RH rectification systems therein, molten steel after the completion of converter smelting,
RH refine during, into molten steel add deoxidier and alloy regulation molten steel component, RH refine latter stage by line feeding unit to
Cleanser core-spun yarn is fed in molten steel, cleanser core-spun yarn can promote growing up, float, removing for field trash, and then improve steel
Liquid cleanliness factor.
2. technical scheme
To reach above-mentioned purpose, technical scheme provided by the invention is：
A kind of RH rectification systems using cleanser core-spun yarn of the present invention, including RH refining furnaces, the RH refining furnaces include
Ladle, vacuum chamber and vacuum device, the vacuum chamber are arranged at the top of ladle, the tedge and down-comer of vacuum chamber bottom
Insert in ladle, vacuum device is arranged at the top of vacuum chamber, and vacuum device is used to provide vacuum environment for vacuum chamber；With
And line feeding unit, line feeding unit include drive mechanism, steady wheel group and line feeding conduit, the driving wheel and driven pulley pair of drive mechanism
It should set, drive mechanism is used to drive cleanser core-spun yarn, and steady wheel group is arranged between drive mechanism and line feeding conduit；It is described
Line feeding conduit is stretched into vacuum chamber, and the conduit outlet of the line feeding conduit is arranged at the top of tedge；Cleanser core-spun yarn passes through
Line feeding unit feeds RH refining furnace cleaning molten steels.
Preferably, described cleanser core-spun yarn includes cleanser inner core, woven wire and steel band outer shell, the steel band
Outer shell is coated on the outside of cleanser inner core, and steel band outer shell is used to protecting and fixing cleanser inner core, the steel band outer shell
On be provided with micropore, layer of metal silk screen is provided between the steel band outer shell and cleanser inner core, in described cleanser
Core is used for cleaning molten steel.
Preferably, the cross section of described cleanser core-spun yarn is ellipse.
Preferably, cleanser inner core includes cleanser, and cleanser includes active principle and bonding component, active principle and
The mass ratio for binding component is (5~10)：1；Described active principle includes metallic aluminium, pulverized limestone, carborundum powder, titanium dioxide
And biomass；Described adhesive component includes kaolin and sulfonated phenol formaldehyde resin.
A kind of method of refining using cleanser core-spun yarn RH rectification systems of the present invention, molten steel are completed in converter smelting
Afterwards, RH refinery practices are transported to, RH enters the station 1600~1640 DEG C of molten steel temperature, RH vacuum≤67Pa, recyclegas flow
For 150-300Nm3/h；During RH is refined, deoxidier and alloy regulation molten steel component, RH refining latter stages are added into molten steel
Cleanser core-spun yarn is fed into molten steel by line feeding unit, the addition of cleanser is the 0.05-1.5% of quality of molten steel.
Preferably, described cleanser core-spun yarn includes cleanser inner core, woven wire and steel band outer shell, the steel band
Outer shell is coated on the outside of cleanser inner core, and steel band outer shell is used to protecting and fixing cleanser inner core, the steel band outer shell
On be provided with micropore, layer of metal silk screen is provided between the steel band outer shell and cleanser inner core, in described cleanser
Core is used for cleaning molten steel.
Preferably, cleanser inner core includes cleanser, and cleanser includes active principle and bonding component, active principle and
The mass ratio for binding component is (5~10)：1；Described active principle includes metallic aluminium, pulverized limestone, carborundum powder, titanium dioxide
And biomass；Described adhesive component includes kaolin and sulfonated phenol formaldehyde resin.
Preferably, described active principle forms according to following mass parts：50~70 parts of metallic aluminium, pulverized limestone 20~40
Part, 0~30 part of graphite powder, 5~20 parts of titanium dioxide, 5~15 parts of carborundum powder, 2~4 parts of biomass, red beautiful 0~1 part of soil, magnesium
Manganese alloy 0-2 parts.
Preferably, the stirring of addition agent for purifying molten steel Posterior circle, the time of mixing are：
K is temperature coefficient, k=2.5 × 105~3.0 × 105；
γ is the addition of cleanser；
T is that RH enters the station molten steel temperature；
V is recyclegas flow.
Preferably, carbonization treatment recyclegas flow is 150-250Nm3/ h, carbonization treatment Posterior circle gas flow are
250-300Nm3/h。
3. beneficial effect
Using technical scheme provided by the invention, compared with existing known technology, there is following remarkable result：
(1) a kind of RH rectification systems using cleanser core-spun yarn of the invention, pass through line feeding by cleanser core-spun yarn
Unit feeds RH refining furnace cleaning molten steels, and cleanser inner core is used for cleaning molten steel, and the conduit outlet of line feeding conduit is arranged at rising
The top of pipe, cleanser core-spun yarn is contacted on the top of tedge with molten steel, and is dissolved in molten steel, the top of tedge and steel
The flowing of liquid is preferable, and so as to promote the mixed effect of cleanser core-spun yarn and molten steel, cleanser core-spun yarn can promote to be mingled with
Thing is grown up, floated, removing, and then improves molten steel cleanness；
(2) a kind of RH rectification systems using cleanser core-spun yarn of the invention, the steel band outer shell of cleanser core-spun yarn
The outside of cleanser inner core is coated on, steel band outer shell is used to protecting and fixing cleanser inner core, set on the steel band outer shell
There is micropore, layer of metal silk screen is provided between steel band outer shell and cleanser inner core, cleanser inner core is used for cleaning molten steel, steel
Micropore is provided with band outer shell, influence of the air being mingled with core-spun yarn to molten steel can be effectively reduced, so as to effectively improve
The quality of molten steel；
(3) a kind of RH rectification systems using cleanser core-spun yarn of the invention, by binding, making by cleanser compound
Grain obtains granular cleanser, and the mating reaction of active principle and bonding component can promote steel inclusion to remove and not
Secondary pollution can be produced to molten steel, remaining inclusion size is smaller, is evenly distributed in the molten steel after the processing of this cleanser, and
The field trash of remaining passes through denaturation treatment substantially, by the mating reaction of active principle and bonding component, can improve molten steel
Clean-up effect；
(4) a kind of method of refining using cleanser core-spun yarn RH rectification systems of the invention, is refined in refining process
Fe and Mn caused by (FeO+MnO) in slag and the cleanser core-spun yarn reaction being prepared enters molten steel by slag interface,
Al2O3、SiO2Slag absorption is refined, so as to reduce oxidation of the refining slag to molten steel, in clean steel smelting process, carborundum can be with
Dissolved oxygen and oxide in molten steel react, and reduce oxygen content in molten steel, and CO gases caused by reaction reduce solid-state
The generation of oxide, CO gases, which float, removes the floating removal that field trash is further promoted to the stirring action of molten steel；
(5) a kind of method of refining using cleanser core-spun yarn RH rectification systems of the invention, can make in refining process
The calcium aluminate that most solid tufted alumina inclusions become low melting point richness CaO low melting points is mingled with, and reduces high-melting-point in steel
Tufted Al2O3The content being mingled with, and then by high-melting-point fragility Al2O3It is mingled with the field trash by modified generation low melting point, promotes
Inclusion floating, and easy agglomeration MnS is mingled with and is partly or entirely modified to tiny CaS and is mingled with, so as to cleaning molten steel.
Brief description of the drawings
Fig. 1 is the schematic cross-section of the cleanser core-spun yarn of the present invention；
Fig. 2 is the sample scans electron microscopic picture of the embodiment of the present invention 1；
Fig. 3 is a kind of structural representation of RH rectification systems using cleanser core-spun yarn of the present invention；
Fig. 4 is the schematic cross-section of the cleanser core-spun yarn of the embodiment of the present invention 4；
Fig. 5 is the RH rectification systems structural representations of the embodiment of the present invention 4.
Label declaration in accompanying drawing：
100th, RH refining furnaces；110th, ladle；120th, vacuum chamber；131st, tedge；132nd, down-comer；140th, air-blowing mechanism；
141st, nozzle；150th, material alloying mechanism；160th, vacuum device；
200th, line feeding unit；210th, drive mechanism；211st, driving wheel；212nd, driven pulley；220th, positioning pipe；230th, steady wheel
Group；240th, line feeding conduit；241st, conduit outlet；250th, heater block；
300th, cleanser core-spun yarn；310th, cleanser inner core；320th, woven wire；330th, steel band shell；340th, micropore.
Embodiment
Accompanying drawing hereafter with reference to the detailed description of the exemplary embodiment of the present invention, the accompanying drawing forms one of description
Point, show the enforceable exemplary embodiment of the present invention as example in the figure.Although these exemplary embodiment quilts
Fully describe in detail to enable those skilled in the art to implement the present invention, it is to be understood that can realize other embodiment and
Can without departing from the spirit and scope of the present invention to the present invention various changes can be made.Hereafter to embodiments of the invention
More detailed description is not limited to required the scope of the present invention, and just to be illustrated and do not limit
Description to the features of the present invention and feature, to propose to perform the best mode of the present invention, and it is sufficient so that people in the art
Member can implement the present invention.Therefore, the scope of the invention is only defined by the appended claims.
Hereafter detailed description of the present invention and example embodiment can be more fully understood with reference to accompanying drawing, wherein the present invention
Element and feature are identified by reference.
Embodiment 1
As shown in figures 1 and 3, a kind of RH rectification systems using cleanser core-spun yarn of the present embodiment, including RH refinings
Stove 100 and line feeding unit 200, the described RH refining furnaces 100 include ladle 110, vacuum chamber 120 and vacuum device 160, described
Vacuum chamber 120 is arranged at the top of ladle 110, tedge 131 and down-comer 132 the insertion ladle 110 of the bottom of vacuum chamber 120
In, vacuum device 160 is arranged at the top of vacuum chamber 120, and vacuum device 160 is used to provide vacuum ring for vacuum chamber 120
Border；RH refining furnaces 100 also include air-blowing mechanism 140, and the nozzle 141 of the air-blowing mechanism 140 is arranged at the bottom of tedge 131,
Air-blowing mechanism 140 promotes molten steel to rise in tedge 131 by blasting argon gas in the upward riser 131 of nozzle 141.Vacuum chamber
Material alloying mechanism 150 is provided with 120, material alloying mechanism 150 is arranged at vacuum chamber 120 close to the side of tedge 131
In side wall；The material alloying mechanism 150 is used to add alloy material into molten steel, and the cross section of cleanser core-spun yarn 300 is circle.
The line feeding unit 200 of the present embodiment includes drive mechanism 210, steady wheel group 230 and line feeding conduit 240, driving machine
The driving wheel 211 and driven pulley 212 of structure 210 are correspondingly arranged, and drive mechanism 210 is used to drive cleanser core-spun yarn 300, steady wheel
Group 230 is arranged between drive mechanism 210 and line feeding conduit 240, and drive mechanism 210 is provided with positioning pipe with steady wheel group 230
220, positioning pipe 220 is used to position cleanser core-spun yarn 300；The conduit outlet 241 of line feeding conduit 240 is arranged at tedge 131
Top；Cleanser core-spun yarn 300 feeds the cleaning molten steel of RH refining furnaces 100 by line feeding unit 200, so as to improve molten steel with
The mixed effect of cleanser core-spun yarn 300, improve clean-up effect of the cleanser core-spun yarn 300 to molten steel.Wherein, line feeding conduit
Heater block 250 is provided with 240.Described cleanser core-spun yarn 300 includes cleanser inner core 310, woven wire 320 and steel
Band outer shell 330, the steel band outer shell 330 are coated on the outside of cleanser inner core 310, and steel band outer shell 330 is used to protect
With fixed cleanser inner core 310, micropore 340, the steel band outer shell 330 and cleanser are provided with the steel band outer shell 330
Layer of metal silk screen 320 is provided between inner core 310, described cleanser inner core 310 is used for cleaning molten steel.
Present applicant is applying for patent of invention before：It is a kind of to take off the agent for purifying molten steel being mingled with for molten steel
(number of patent application：2017103896965), the cleanser of the patent can improve the clean-up effect of molten steel, have and significantly make
With.But it has been found that graininess or spherical cleanser are difficult to during molten steel is added during use
Effectively control, and addition opportunity also cannot effectively control；Therefore, applicant of the present invention grinds by the way that length is a series of
Study carefully, cleanser core-spun yarn, and the creative RH rectification systems proposed using cleanser core-spun yarn be prepared in cleanser,
It can effectively, accurately control addition and the addition opportunity of cleanser core-spun yarn.Moreover, due to being set on steel band outer shell 330
Micropore 340 is equipped with, influence of the air being mingled with core-spun yarn to molten steel can be effectively reduced, so as to effectively increase molten steel
Quality.The collective effect of micropore 340 and woven wire 320, had both avoided cleanser and had been scattered, and can avoid being mingled with core-spun yarn again
Gas enter molten steel, and then influence the clean-up effect of molten steel.
A kind of method of refining using cleanser core-spun yarn RH rectification systems of the present invention, RH before processings require vacuum bath temperature
>=1300 DEG C of degree, vacuum equipment must be intact, and vacuum, which can reach below 67Pa, to smelt.RH enter the station molten steel temperature 1600~
1640 DEG C, RH vacuum≤67Pa, the present embodiment RH enter the station molten steel temperature as 1610 DEG C, and RH vacuum is 60Pa；Circulation
Gas flow is 150-300Nm3/ h, when concrete operations are carbonization treatment, the recyclegas flow of carbonization treatment early stage is 150-
200Nm3/ h, the preferred 180Nm of the present embodiment3/ h, time 8min；The recyclegas flow in carbonization treatment later stage is 200-
250Nm3/ h, the preferred 220Nm of the present embodiment3/ h, time 5min；Carbonization treatment Posterior circle gas flow is 250-300Nm3/ h,
The preferred 300Nm of the present embodiment3/h。
RH refine during, into molten steel add deoxidier and alloy regulation molten steel component, deoxidier be aluminum shot or
The mixture of ferrosilicon, or both；The present embodiment use for aluminum shot；Alloy enters alloy for metal alloy to be dried in advance
Roasting processing, baking time are more than 30min.RH refining latter stages add cleanser into molten steel, and the addition of cleanser is molten steel matter
The 0.05-1.5% of amount, preferably 0.8-1.2%, the present embodiment 1%, add agent for purifying molten steel Posterior circle and stir 3~10min.
By further research, applicant optimizes the time control of stirring, and the time specifically mixed is：
K is temperature coefficient, k=2.5 × 105~3.0 × 105, DEG C m3, the present embodiment selects 2.7 × 105；
γ is the addition of cleanser；
T is that RH enters the station molten steel temperature；
V is recyclegas flow, 300Nm3/ h=5.0m3/min。
The cleanser of the present embodiment includes active principle and bonding component, and active principle and the mass ratio for binding component are (5
~10)：1, the present embodiment preferably 8:1, active principle includes metallic aluminium, pulverized limestone, carborundum powder, titanium dioxide and biomass,
Active principle presses following 50~70 parts of mass parts metallic aluminium, 20~40 parts of pulverized limestone, 5~20 parts of titanium dioxide, carborundum powder 5
~15 parts, 2~4 parts of biomass, the present embodiment choosing：Metallic aluminium 60kg, pulverized limestone 30kg, titanium dioxide 18kg, carborundum powder
15kg, biomass 3kg.
It is worth noting that：Each component in active principle is powdery, and granularity≤0.1mm, i.e. metallic aluminium, lime
Powder, titanium dioxide, carborundum powder are powdery, and granularity≤0.1mm of metallic aluminium, pulverized limestone, titanium dioxide, biomass, carbonization
Granularity≤0.05mm of silica flour.It is worth noting that：The biomass of the present embodiment is except grain, fruit in agriculture and forestry production process
During lignocellulosic, farming industry leftover bits and pieces, agriculture and forestry organic waste material and the Animal husbandry productions such as stalk in addition, trees
Fowl and animal excrement and discarded object.
Al content in the metallic aluminium of the present embodiment is more than 92%, the present embodiment 93%；The lime of the present embodiment is work
Property lime, it is that the crystal grain obtained in 1100 DEG C of calcining heat is small, porosity is high, bulk density is small lime, and this implementation
The activity degree of lime is in 330ml/4N-HCl used by example.Carborundum powder is by silicon with carbon with the nonmetallic of Covalent bonding together
Carbide.
The adhesive component of the present embodiment includes kaolin and sulfonated phenol formaldehyde resin, and adhesive component is formed by following mass parts：
60~80 parts of kaolin, 20~40 parts of sulfonated phenol formaldehyde resin；The present embodiment selects：Kaolin 70kg, sulfonated phenol formaldehyde resin 30kg.
Cleanser is added in molten steel, cleanser may be as follows to the reaction mechanism of molten steel purifying：Refine latter stage refining
(FeO+MnO) content, when FeO, MnO content in slag are higher, will produce non-metallic inclusion, no probably 1~3% in slag
Beneficial to the cleanliness factor for improving molten steel.In clean steel smelting process, to reduce (FeO+MnO) and alloying element in molten steel in refining
The generation of oxidation reaction, it is therefore necessary to further reduce the oxidisability of refining slag.Cleanser is added in molten steel, cleanser exists
Following react can occur in molten steel：
Al+3/2 (FeO)=1/2 (Al2O3)+3/2[Fe]
Al+3/2 (MnO)=1/2 (Al2O3)+3/2[Mn]
SiC+3 (FeO)=SiO2+CO↑+3[Fe]
SiC+3 [O]=SiO2+CO↑+3[Fe]
3(TiO2)+C=[Ti3O5]+CO
(FeO+MnO) in refining slag enters molten steel, Al with Fe and Mn caused by cleanser reaction by slag interface2O3、
SiO2Slag absorption is refined, so as to reduce oxidation of the refining slag to molten steel.In clean steel smelting process, carborundum can with molten steel
Dissolved oxygen and oxide react, reduce molten steel in oxygen content, and react caused by CO gases reduce solid-oxide
Generation, CO gases, which float, to be removed the floating that field trash is further promoted to the stirring action of molten steel and removes.Moreover, in slag
Oxide promote at high temperature and oxidizing biomass and sulfonated phenol formaldehyde resin decompose generation H2、CH4, CO, and biomass reverse Ying Su
Degree is rapid, promotes the progress of subsequent reactions, improves the efficiency of reaction；H2、CH4[O] in slag can be reacted, so as to directly
[O] content in molten steel is reduced, and reduces the generation of deoxidation type inclusion, caused gas is stirred to molten steel, and
Small vacuum chamber is formed in molten steel, so as to promote the floating of field trash, improves the cleanliness factor of molten steel；And in adhesion component
Sulfonated phenol formaldehyde resin in accelerator of the later stage as agitation of molten steel, can improve the clean-up effect of molten steel.And can in biomass
With TiO2Reaction, Ti caused by above-mentioned reaction3O5It is the atomic group of stable big ionic radius, other field trashes can be adsorbed,
Easily float and be refined slag Adsorption.In addition, the present invention carries out denaturation treatment by using pulverized limestone to field trash, pulverized limestone exists
It is more more stable than calcium metal at a temperature of steel-making, and do not allow it is volatile, do not decompose, and the molten steel caused by blowing process will not be produced
Nitrogen pick-up, can be in the case where original molten steel oxygen gesture be very high, and total oxygen content is relatively low after still keeping deoxidation.
The addition of pulverized limestone can make most solid tufted alumina inclusions become the aluminic acids of low melting point richness CaO low melting points
Calcium is mingled with, and reduces dystectic tufted Al in steel2O3The content being mingled with, and then by high-melting-point fragility Al2O3It is mingled with and passes through modification
Generate the field trash of low melting point, promote inclusion floating, and easy agglomeration MnS is mingled with partly or entirely be modified to it is tiny
CaS is mingled with, and so as to cleaning molten steel, improves steel product quality.The scavenger metal aluminium of the present invention, carborundum powder, biomass can drop
Oxidisability in low molten steel and slag, and the gas that carborundum powder, biomass reverse should generate is stirred to molten steel, promotes steel
Inclusion floating in liquid, steel inclusion is promoted to float up to slag interface, at the same time cleanser is to the field trash in molten steel
It is modified, under cleanser each component collective effect of the present invention, reduces the oxidisability in molten steel of knowing clearly, steel can be effectively facilitated
Field trash removing and inclusion conditioning, modified field trash turn into multilayered sphere in liquid, and field trash is tiny and is evenly distributed,
High-melting-point field trash can change to lower melting point inclusion, be advantageous to the removal of field trash, and the steel in the presence of Gas Stirring
Remaining inclusion size is smaller in liquid, is evenly distributed, and the field trash of remaining passes through denaturation treatment substantially, will not be to steel system
Moral character can have an impact, so as to improve the quality of molten steel.The later stage is refined in RH, cleanser core-spun yarn is fed by feeding wire machine
In molten steel, so as to carry out purified treatment, the total oxygen content after detection is modified in molten steel to molten steel, and record as shown in table 1；Steel
The scanning electron microscopic picture of sample is as shown in Figure 2.
Analysis find do not use cleanser steel inclusion quantity it is more, field trash type is mainly dystectic tufted
Al2O3It is mingled with, inclusion size accounts for more than 70% more than 3 μm, and account for field trash total amount 20% or so more than 10 μm.Through steel
The amount of inclusions after the processing of liquid cleanser in steel is less, and inclusion size is smaller, and size accounts for field trash total amount less than 3 μm
80%, field trash type is mainly magnesium aluminate spinel and Silicate inclusion thing, the Al of individualism in steel2O3It is mingled with less.Examination
Research to be tested to show to significantly reduce using the inclusion content of steel after agent for purifying molten steel processing, steel inclusion is denatured,
The clean-up effect of molten steel is obvious.Using remaining inclusion size is smaller, it is equal to be distributed in the molten steel after the cleanser processing of embodiment 1
It is even, and the field trash of remaining passes through denaturation treatment substantially, and steel product performance will not be had an impact.
Comparative example 1
With embodiment 1, difference is the substance of this comparative example：The cleanser of the present invention is form of spherical particles,
Particle diameter is 5~10mm；Total oxygen content after detection is modified in molten steel, and record as shown in table 1.
Total oxygen content/ppm before and after the addition cleanser of table 1 in molten steel
As shown in table 1 and Fig. 2, comparative example 1 and be that embodiment 1 is contrasted it can be found that using core cabling wire scavenging agent can
Further to reduce the total oxygen content in molten steel, this is due to the addition opportunity that core-spun yarn accurately controls cleanser core-spun yarn
And addition, and the collective effect of the micropore 4 of core-spun yarn and woven wire 2, both avoided cleanser and be scattered, and can avoid wrapping again
The gas being mingled with cored wire enters molten steel, and then influences the clean-up effect of molten steel.
The preparation method of the present embodiment cleanser core-spun yarn 300, is comprised the following steps that：
Step 1：Prepare bonding component
Kaolin 70kg and sulfonated phenol formaldehyde resin the 30kg drying in drying box are weighed by mass parts, is being stirred after the completion of drying
Mixing 15~20min, the present embodiment 18min in machine is mixed, it is well mixed to obtain binding component；
Step 2：Prepare active principle
Metallic aluminium 60kg, pulverized limestone 30kg, titanium dioxide 18kg, carborundum powder 15kg and biomass are weighed by mass parts
3kg is dried in drying box, and 25~30min, the present embodiment 30min, mixing are stirred in stirrer for mixing after the completion of drying
Uniformly obtain active principle；
Step 3：Cleanser compound
Bonding component is added in the mixer of active principle, and active principle and the mass ratio of bonding component are 8:1,
Mixing completion is purified agent compound；
Step 4：Coat core-spun yarn
Cleanser salt and spice is overlying on inside steel band outer shell 330, the internal layer of steel band outer shell 330 is provided with metal
Silk screen 320, then by steel band outer shell 330 on open up micropore 340 and be purified agent core-spun yarn, then by cleanser in closed bar
1h is incubated at lower 70 DEG C of part；Then cleanser core-spun yarn is dried in drying box, coolant seal is stand-by.
CaO carries out modifying process to biomass during mixing, and then improves the intensity of cleanser particle, avoids
Grain efflorescence, and biomass is in the decomposition of hot conditions biomass under the promotion in metallic element, carborundum powder, biomass and gold
Category aluminium collective effect reduces the oxygen content in molten steel, produces the progress that gas accelerates reaction, carborundum powder, biomass can be entered
One step produces gas and promotes inclusion floating, and pulverized limestone, carborundum powder, titanium dioxide improve molten steel and goes to be mingled with during being mingled with
The floating dynamic conditions removed, and to being modified or adsorbing to field trash, so as to promote the inclusion floating in molten steel,
Further promote the removal of field trash, reduce the content of nonmetallic inclusionsin steel, improve the quality of molten steel.
The present invention cleanser in molten steel field trash removing and will not secondary pollution molten steel research, by the present invention
Remaining inclusion size in the molten steel of removing is smaller, is evenly distributed, and the field trash of remaining passes through denaturation treatment substantially, no
Steel part performance can be had an impact.
Embodiment 2
With embodiment 1, difference is the substance of the present embodiment：Cleanser is graininess, and cleanser is spherical
Graininess, particle diameter are 5~10mm；Cleanser includes the matter of active principle and bonding component, active principle and bonding component
It is (5~10) to measure ratio：1, the present embodiment preferably 5:1.
Active principle in the present embodiment cleanser also includes graphite powder, red beautiful soil and magnesium-manganese alloy；Active principle according to
Following mass parts composition, 50~70 parts of metallic aluminium, 20~40 parts of pulverized limestone, 0~30 part of graphite powder, 5~20 parts of titanium dioxide, carbon
5~15 parts of SiClx powder, 2~4 parts of biomass, red beautiful 0~1 part of soil, magnesium-manganese alloy 0-2 parts；The present embodiment is metallic aluminium 50kg, stone
Ashes 20kg, graphite powder 10kg, titanium dioxide 5kg, carborundum powder 5kg, biomass 4kg, the red native 1kg of jade, magnesium-manganese alloy 2kg.
The present invention further increases deoxidation effect, and this is probably due to metallic aluminium, graphite powder, biomass, carborundum, red
Beautiful soil and magnesium-manganese alloy powder collective effect promote the removing of the oxygen in molten steel, on the one hand magnesium-manganese alloy powder has preferably de-
Oxygen effect, and magnesium-manganese alloy powder further promotes the materials such as metallic aluminium, biomass and carborundum and carries out deoxidation, and graphite
The gas of powder, biomass and carborundum powder reaction generation is stirred to molten steel, the common reaction production of red beautiful soil and titanium dioxide
Thing adsorbs to field trash, promotes the floating of field trash, and then improves the quality of molten steel, and experimental result is substantially the same as implementation
Example 1.
Embodiment 3
With embodiment 1, difference is the substance of the present embodiment：The bonding component of cleanser also include starch and
Kaolin, bonding component form according to following mass parts：60~80 parts of kaolin, 20~40 parts of sulfonated phenol formaldehyde resin, starch 0-
10 parts, oil-sand 0-5 parts.The present embodiment forms according to following quality：Kaolin 80kg, sulfonated phenol formaldehyde resin 40kg, starch 5kg,
Oil-sand 2kg.Active principle and the mass ratio of bonding component are 6:1, mixing completion is purified agent compound.Experimental result is basic
With embodiment 1.
Embodiment 4
With embodiment 2, difference is the substance of the present embodiment：Cleanser is graininess, and cleanser is spherical
Graininess, particle diameter are 5~10mm；Cleanser includes the matter of active principle and bonding component, active principle and bonding component
It is (5~10) to measure ratio：1, the present embodiment preferably 10:1.
Active principle in the present embodiment cleanser also includes urea, and described urea is graininess；The present embodiment is gold
Belong to aluminium 70kg, pulverized limestone 40kg, graphite powder 30kg, titanium dioxide 20kg, carborundum powder 15kg, biomass 2kg, the red native 1kg of jade,
Magnesium-manganese alloy 1kg, urea 0.2kg.As shown in figure 4, the cross section of described cleanser core-spun yarn 300 is ellipse, ellipse
Molten steel and cleanser core-spun yarn 300 are not only increased, and promotes the dissolving of cleanser core-spun yarn 300 and molten steel, mix, is carried
High clean-up effect.The ratio of oval short axle and major axis is 2/3~3/4.
As shown in figure 5, the cross section of cleanser core-spun yarn 300 is ellipse, the internal diameter at the described top of tedge 131 is big
Internal diameter in the bottom of tedge 131, the internal diameter of tedge 131 gradually increase from the bottom to top.The line feeding conduit 240 passes through vacuum
The top of room 120 is stretched into vacuum chamber 120；Be provided with heater block 250 on the line feeding conduit 240, and heater block 250 with
The top of vacuum chamber 120 is in contact.
By cleanser in molten steel, the total oxygen content after then detection is modified in molten steel, experimental result is substantially the same as implementation
Example 1.Remaining inclusion size is smaller in molten steel after processing, is evenly distributed, and the field trash of remaining is substantially by denaturation
Reason, will not have an impact to steel product performance.The present invention further increases deoxidation effect, this be probably due to metallic aluminium,
Graphite powder, biomass, carborundum, Chi Yutu, magnesium-manganese alloy powder and urea collective effect promote the removing of the oxygen in molten steel, magnesium
On the one hand manganese alloy powder has a preferable deoxidation effect, and magnesium-manganese alloy powder further promote metallic aluminium, biomass and
The materials such as carborundum carry out deoxidation, and the gas of graphite powder, biomass and carborundum powder reaction generation is stirred to molten steel, special
Not to be urea can decompose rapidly when heated generation analyte, the Ammonia material in analyte have stronger reproducibility, improved
Deoxidation effect, and gas is stirred to molten steel caused by reaction product, improve the floating of field trash.
The present invention is described in detail above in conjunction with specific exemplary embodiment.It is understood, however, that it can not take off
Various modifications and variations are carried out in the case of from the scope of the present invention being defined by the following claims.Detailed description and drawings
Should be to be considered only as it is illustrative and not restrictive, if there is any such modifications and variations, then they all will
Fall into the scope of the present invention described here.In addition, background technology is intended to illustrate the Development Status of this technology and meaning,
It is not intended to limit the application field of the present invention or the application and the present invention.
More specifically, although the exemplary embodiment of the present invention has been described herein, but the invention is not limited in
These embodiments, but including those skilled in the art according to above detailed description it can be appreciated that it is modified, omit,
Any and whole embodiments of (such as between each embodiment) combination, adaptive change and/or replacement.In claim
Restriction can widely be explained according to the language used in claim, and be not limited in foregoing detailed description or in reality
The example described during this application is applied, these examples are considered as nonexcludability.For example, in the present invention, term is " preferably
Ground " not exclusively, preferably, here it means that " but be not restricted to that ".It is in office where method or process claims
In any step for enumerating can in any order perform and be not limited to the order proposed in claim.Therefore, it is of the invention
Scope only should be determined by appended claims and its legal equivalents, rather than by descriptions and examples given above Lai
It is determined that.
Claims (10)
- A kind of 1. RH rectification systems using cleanser core-spun yarn, it is characterised in that：IncludingRH refining furnaces (100), the RH refining furnaces (100) include ladle (110), vacuum chamber (120) and vacuum device (160), The vacuum chamber (120) is arranged at the top of ladle (110), the tedge (131) and down-comer of vacuum chamber (120) bottom (132) insert in ladle (110), vacuum device (160) is arranged at the top of vacuum chamber (120), and vacuum device (160) is used In for vacuum chamber (120) provide vacuum environment；AndLine feeding unit (200), line feeding unit (200) include drive mechanism (210), steady wheel group (230) and line feeding conduit (240), the driving wheel (211) of drive mechanism (210) and driven pulley (212) are correspondingly arranged, and drive mechanism (210) is used to drive only Agent core-spun yarn (300), steady wheel group (230) are arranged between drive mechanism (210) and line feeding conduit (240)；The line feeding Conduit (240) is stretched into vacuum chamber (120), and the conduit outlet (241) of the line feeding conduit (240) is arranged at tedge (131) Top；Cleanser core-spun yarn (300) feeds RH refining furnaces (100) cleaning molten steel by line feeding unit (200).
- 2. a kind of RH rectification systems using cleanser core-spun yarn according to claim 1, it is characterised in that described is net Agent core-spun yarn (300) includes cleanser inner core (310), woven wire (320) and steel band outer shell (330), outside the steel band Shell (330) is coated on the outside of cleanser inner core (310), and steel band outer shell (330) is used to protecting and fixing cleanser inner core (310) micropore (340), the steel band outer shell (330) and cleanser inner core (310), are provided with the steel band outer shell (330) Between be provided with layer of metal silk screen (320), described cleanser inner core (310) is used for cleaning molten steel.
- 3. a kind of RH rectification systems using cleanser core-spun yarn according to claim 1, it is characterised in that described is net The cross section of agent core-spun yarn (300) is ellipse.
- A kind of 4. cleanser core-spun yarn of steel-making according to Claims 2 or 3, it is characterised in that：Cleanser inner core (310) cleanser is included, cleanser includes active principle and bonding component, and active principle and the mass ratio for binding component are (5 ~10)：1；Described active principle includes metallic aluminium, pulverized limestone, carborundum powder, titanium dioxide and biomass；Described bonding Component includes kaolin and sulfonated phenol formaldehyde resin.
- A kind of 5. method of refining using cleanser core-spun yarn RH rectification systems, it is characterised in that：Molten steel is completed in converter smelting Afterwards, RH refinery practices are transported to, RH enters the station 1600~1640 DEG C of molten steel temperature；During RH is refined, added into molten steel de- Oxygen agent and alloy regulation molten steel component, RH refining latter stages feed cleanser core-spun yarn into molten steel by line feeding unit (200) (300), the addition of cleanser is the 0.05-1.5% of quality of molten steel.
- A kind of 6. method of refining using cleanser core-spun yarn RH rectification systems according to claim 5, it is characterised in that： Described cleanser core-spun yarn (300) includes cleanser inner core (310), woven wire (320) and steel band outer shell (330), institute The outside that steel band outer shell (330) is coated on cleanser inner core (310) is stated, steel band outer shell (330) is used to protect and fixed net Agent inner core (310), micropore (340), the steel band outer shell (330) and cleanser are provided with the steel band outer shell (330) Layer of metal silk screen (320) is provided between inner core (310), described cleanser inner core (310) is used for cleaning molten steel.
- A kind of 7. method of refining using cleanser core-spun yarn RH rectification systems according to claim 5, it is characterised in that： Cleanser inner core (310) includes cleanser, and cleanser includes active principle and bonding component, active principle and bonding component Mass ratio is (5~10)：1；Described active principle includes metallic aluminium, pulverized limestone, carborundum powder, titanium dioxide and biomass； Described adhesive component includes kaolin and sulfonated phenol formaldehyde resin.
- A kind of 8. method of refining using cleanser core-spun yarn RH rectification systems according to claim 7, it is characterised in that： Described active principle forms according to following mass parts：50~70 parts of metallic aluminium, 20~40 parts of pulverized limestone, 0~30 part of graphite powder, 5~20 parts of titanium dioxide, 5~15 parts of carborundum powder, 2~4 parts of biomass, red beautiful 0~1 part of soil, magnesium-manganese alloy 0-2 parts.
- A kind of 9. method of refining using cleanser core-spun yarn RH rectification systems according to claim 7, it is characterised in that： The stirring of agent for purifying molten steel Posterior circle is added, the time of stirring is：<mrow> <mi>t</mi> <mo>=</mo> <mfrac> <mrow> <mi>&gamma;</mi> <mi>k</mi> </mrow> <mrow> <mo>(</mo> <mi>T</mi> <mo>-</mo> <mn>1500</mn> <mo>)</mo> <mi>v</mi> </mrow> </mfrac> </mrow>K is temperature coefficient, k=2.5 × 105~3.0 × 105；γ is the addition of cleanser；T is that RH enters the station molten steel temperature；V is recyclegas flow.
- 10. a kind of method of refining using cleanser core-spun yarn RH rectification systems according to claim 7, its feature exist In：Carbonization treatment recyclegas flow is 150-250Nm3/ h, carbonization treatment Posterior circle gas flow are 250-300Nm3/h。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710643530.1A CN107354272A (en) | 2017-07-31 | 2017-07-31 | A kind of RH rectification systems and its method of refining using cleanser core-spun yarn |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710643530.1A CN107354272A (en) | 2017-07-31 | 2017-07-31 | A kind of RH rectification systems and its method of refining using cleanser core-spun yarn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107354272A true CN107354272A (en) | 2017-11-17 |
Family
ID=60286040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710643530.1A Withdrawn CN107354272A (en) | 2017-07-31 | 2017-07-31 | A kind of RH rectification systems and its method of refining using cleanser core-spun yarn |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107354272A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777231A (en) * | 2019-11-22 | 2020-02-11 | 龙南龙钇重稀土科技股份有限公司 | Vacuum furnace wire feeding device |
| CN111349752A (en) * | 2020-04-30 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium dioxide steel core wire |
| CN111349751A (en) * | 2020-04-29 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of low-titanium steel |
| CN111455132A (en) * | 2020-04-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of titanium-containing steel |
| CN111455133A (en) * | 2020-04-30 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium-containing titanium dioxide steel core wire |
| CN113373278A (en) * | 2021-05-25 | 2021-09-10 | 江苏省沙钢钢铁研究院有限公司 | RH vacuum furnace slag surface feeding device and furnace slag modification method |
| CN113549731A (en) * | 2021-07-14 | 2021-10-26 | 鞍钢股份有限公司 | Method for reducing aluminum killed steel inclusions |
-
2017
- 2017-07-31 CN CN201710643530.1A patent/CN107354272A/en not_active Withdrawn
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110777231A (en) * | 2019-11-22 | 2020-02-11 | 龙南龙钇重稀土科技股份有限公司 | Vacuum furnace wire feeding device |
| CN111349751A (en) * | 2020-04-29 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of low-titanium steel |
| CN111455132A (en) * | 2020-04-29 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Production method for reducing grade of A-type inclusions of titanium-containing steel |
| CN111349752A (en) * | 2020-04-30 | 2020-06-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium dioxide steel core wire |
| CN111455133A (en) * | 2020-04-30 | 2020-07-28 | 攀钢集团攀枝花钢铁研究院有限公司 | Application method of titanium-containing titanium dioxide steel core wire |
| CN113373278A (en) * | 2021-05-25 | 2021-09-10 | 江苏省沙钢钢铁研究院有限公司 | RH vacuum furnace slag surface feeding device and furnace slag modification method |
| CN113373278B (en) * | 2021-05-25 | 2022-06-21 | 江苏省沙钢钢铁研究院有限公司 | RH vacuum furnace slag surface feeding device and furnace slag modification method |
| CN113549731A (en) * | 2021-07-14 | 2021-10-26 | 鞍钢股份有限公司 | Method for reducing aluminum killed steel inclusions |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107354272A (en) | A kind of RH rectification systems and its method of refining using cleanser core-spun yarn | |
| CN104789718B (en) | A kind of recoverying and utilizing method of steel slag | |
| CN102471814B (en) | The sulfur method of molten iron | |
| CN102181610A (en) | Composite slagging agent for making semisteel, and preparation method and using method thereof | |
| CN110055370A (en) | A kind of new type high temperature steel slag modification agent and modified pretreating process | |
| CN107245546B (en) | A kind of preparation method of agent for purifying molten steel | |
| CN109731574A (en) | A kind of preparation method of catalyst complex carrier, the catalyst based on the carrier and catalyst | |
| CN100552053C (en) | The preparation method of fine oxide dispersion steel | |
| CN108486315A (en) | It is a kind of using pneumatic steelmaking dedusting ash as dephosphorization of molten iron desulfurizing agent of base-material and preparation method thereof | |
| CN107130084B (en) | It is a kind of to take off the agent for purifying molten steel being mingled with for molten steel | |
| CN101302573A (en) | Additive for preparing fine oxide dispersion steel, preparation and use thereof | |
| CN107164605A (en) | A kind of LF refining method of deoxidation for producing low-carbon welding wire steel | |
| JP6003911B2 (en) | Phosphate fertilizer raw material, phosphate fertilizer and production method thereof | |
| JP5191861B2 (en) | Manufacturing method of slag for cement raw material | |
| CN104451007B (en) | Method for removing manganese from molten iron of blast furnace | |
| JP5493997B2 (en) | Converter refining method | |
| CN100543153C (en) | The composite sphere and the method for making thereof that are used for outside-stove refining dephosphorization, removal fine foreign matter | |
| EP1198599A1 (en) | Method for conditioning slag with the addition of metallurgical residual materials and an installation for the same | |
| CN107254590A (en) | A kind of method that W metallurgy is refined using low-grade tungsten mining and metallurgy | |
| CN107365889B (en) | A kind of cleanser core-spun yarn of steel-making and preparation method thereof | |
| CN107217124A (en) | The smelting process and its production technology of a kind of electrical sheet | |
| CN107058680A (en) | A kind of LF refining deoxidation slagging method for producing the low silicon cold-forging steel of middle carbon | |
| CN107236844A (en) | The smelting process and production technology of a kind of clean steel | |
| JP4927467B2 (en) | CaO-based desulfurizing agent and method for desulfurizing molten iron | |
| CN107429306A (en) | Production method of sendust and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20171117 |