CN109929964A - A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization - Google Patents
A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization Download PDFInfo
- Publication number
- CN109929964A CN109929964A CN201910352181.7A CN201910352181A CN109929964A CN 109929964 A CN109929964 A CN 109929964A CN 201910352181 A CN201910352181 A CN 201910352181A CN 109929964 A CN109929964 A CN 109929964A
- Authority
- CN
- China
- Prior art keywords
- molten iron
- agstone
- slag making
- high pressure
- lime stone
- 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.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention relates to technical field of ferrous metallurgy, a kind of more particularly to method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization, now propose following scheme, comprising the following steps: S1, the raw material for preparing following parts by weight: 20-80 parts, 2-8 parts of lime stone powder of ferriferous raw material (iron powder, pig iron, ladle)；S2, it the ferriferous raw material of above-mentioned parts by weight is placed into molten iron container generates molten iron, molten iron temperature is controlled at 1350 DEG C -1500 DEG C；S3, above-mentioned parts by weight lime stone powder is blown into molten iron using carrier gas as carrier by oxygen rifle, the blowing time is 0.5min-30min；S4, thermometric sampling analysis is carried out to finished product.The present invention utilizes the resolution characteristic of lime stone, and the advantage of jet metaurgy is utilized, and lime stone powder is effectively utilized via the product decomposed after rapidly heating up, wherein the process of CaO participation slag making dephosphorization, and CO2CO is generated after reacting with C, Si, Mn etc. in molten iron, can continue to utilize, with low, the high-efficient advantage of cost of investment.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy more particularly to a kind of oxygen coverter high pressure blow smelting operation agstone slag making are de-
The method of phosphorus.
Background technique
Slag making is the vital joint of converter procedure, and the purpose of converter slag-making is the p and s removed in molten iron,
Therefore the quality of slag making effect directly affects the effect of impurity element in converter removal molten iron.Existing converter slag-making material requested packet
Lime, fluorite, dolomite, iron ore and the slag former of synthesis are included, lime is CaO, lime as its main component of slag making raw material
Active quality directly determines slag making situation.And the oxygen supply time of oxygen converter steelmaking generally only has more than ten minutes, turns during this period
Furnace necessarily is formed the slag with certain basicity, good fluidity, reasonable oxidisability, normal foamed, only more than satisfaction
All conditions could smelt molten steel qualified out.
The method of present converter dephosphorization of molten iron is that quickly oxygen supply makes phosphorus generate P into molten iron2O5It floats in clinker, but slag
Middle P2O5It is unstable, it is easily reduced and reenters molten iron, it is therefore desirable to alkaline slag former lime be added, allow P2O5In clinker
CaO reaction generate calcium silicates, calcium silicates fusing point is high and stablizes, so that P element stabilization is solid-solubilized in clinker, reaches removing
The purpose of P.In the reaction process of dephosphorization of molten iron, lime play the role of as phosphor-curing agent it is vital, since lime is not
Thing existing for nature, it is obtained in limekiln by high-temperature calcination by lime stone, is to guarantee lime stone in furnace
It can adequately complete decomposable process, general lime stone calcination time in furnace is 2~4 hours, calcination temperature is 1000 DEG C~
1200 DEG C or so, and decomposition of limestone required temperature is 900 DEG C of far smaller than calcination temperatures.Therefore when blocky lime
When stone interior zone is completed to decompose, the external early lime that decomposition is completed then needs to reheat several hours under the high temperature conditions,
The serious burning outside lime is inevitably resulted in, and burning will necessarily reduce the activity of lime.Simultaneously, it is well known that lime is forged
Burning process there are a large amount of energy waste and pollution environment a series of problems, such as.
Lime stone main component is CaCO3, high-temperature heating is decomposed into CaO and CO2, wherein CaO can be used as making for converter procedure
Residue material, the CO released2It may participate in melt tank reaction.It is added lime stone as slag making materials in converter thus, completes to make
While slag dephosphorization task, and the CO that can be generated2Resource utilization greatly reduces CO2Utilization cost.It is domestic thus
It is proposed substitutes lime slagging and producing steel with lime stone, attempts energy-saving and emission-reduction in process of production, curbs environmental pollution.It is replaced with lime stone
Lime calcining link is eliminated for the method for lime slagging and producing steel, thus shortens production line, lime is generated in converter without drop
Temperature heats up again, improves efficiency of heating- utilization, eliminates the disposal of pollutants of lime calcining and transportational process.Through known to research: opposite
Low temperature is calcined for a long time in conventional lime kiln, and the newly-generated lime of the interior calcining of high temperature, short time has under converter early stage condition
Higher activity, so as to quickly participate in slagging process；The CO of decomposition of limestone in converter2, can in molten iron [C],
[Si], [Mn], Fe (l) reaction generate CO, to increase the concentration of CO and coal-gas recovering amount in furnace gas.
However, decomposition of limestone need to consume amount of heat, when concentrating addition from top particularly by feed bin, heat consumption is more
Greatly.What is be added is lime stone diameter generally between 10-40mm, and larger limestone block is not easy calcining and decomposing, and lime stone is added molten
It absorbs heat after slag due to decomposing, lime stone is caused quickly to reduce with first slag contact surface temperature, form harder skull, reaction surface activity
It reduces, is unfavorable for subsequent slugging process, the CO for causing lime stone to carry2It is not utilized；In addition lime stone density is about
2.7g/cm3Left and right, density is about the half of iron bath, after being directly added at the top of converter, even if there is stirring for top blast oxygen
The effect of mixing, but still have part lime stone that can float on molten bath top, the CO that decomposition of limestone generates2It can not be come into full contact with molten bath,
It is directly entered furnace gas, CO2Utilization rate is not high.To solve this problem, oxygen coverter high pressure blow smelting operation agstone slag making refining is proposed
Agstone is entered high-temperature metal molten bath using high voltage style blowing using gas as carrier, is just utilized by the method for steel
The advantage of jet metaurgy.Pulvis carrier gas is sent into molten steel deep through blowing element by spraying metallurgy technology, fills pulvis with molten steel
Tap touching, participates in reaction, improves the contact area and surface-active between reactant, improves further while production efficiency
Promote the cleanliness of molten steel；The limestone particle partial size of converter blowing is smaller, and diabatic process is no longer restricted, can be molten in metal
Decomposition is heated quickly in pond, the fat lime for calcining generation has the characteristics that large specific surface area, porosity are big, heap density is small,
Surface-active is higher, and slag making effect and rate can be improved；And limestone particle decomposes the CO of release2It can be filled as foam caused by reduction
Divide and participate in steel-making reaction, substitution partial oxidation realizes soft blow while oxygen supply, improves molten bath dynamic conditions.
If short grained lime stone high speed enters using the method for above-mentioned converter high pressure blow smelting operation agstone slag making dephosphorization
After iron bath, decomposable process can be completed between several milliseconds, the little particle high property lime living for decomposing generation can sufficiently participate in making
Slag reaction.And lime stone decomposes the CO generated2As weak oxidant, can sufficiently with element haptoreaction, generation in molten iron
For a part oxygen supply, while playing the role of agitation molten pool.Therefore above-mentioned converter high pressure blow smelting operation agstone slag making dephosphorization is used
Method, efficiently complete slag making dephosphorization task while resourcebility utilize CO2。
Summary of the invention
The purpose of the present invention is to solve existing in the prior art, using blocky slagging with Lime stone, there are slugging difficulty, stones
Lime stone decomposes the CO generated2Utilization rate it is not high the shortcomings that, and propose a kind of oxygen coverter high pressure blow smelting operation agstone slag making
The method of dephosphorization.
To achieve the goals above, present invention employs following technical solutions:
A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization, comprising the following steps:
S1, the raw material for preparing following parts by weight: ferriferous raw material (iron powder, pig iron, ladle) 20-80 parts, agstone
2-8 parts of body；
S2, it the ferriferous raw material of above-mentioned parts by weight is placed into molten iron container generates molten iron, molten iron temperature is controlled 1350
℃-1500℃；
S3, above-mentioned parts by weight lime stone powder is blown into molten iron using carrier gas as carrier by oxygen rifle, blowing the time be
0.5min-30min；
S4, thermometric sampling analysis is carried out to finished product.
Preferably, it be 0.3%-0.4%, Mn content is 0.1%- that carbon content, which is 2.5%-5%, Si content, in the molten iron
0.3%, P content 0.1%-0.2%.
Preferably, the granularity of the lime stone powder is 0.01mm-2mm.
Preferably, the molten iron container is one of converter, ladle, corundum crucible, vaccum sensitive stove.
Preferably, the carrier gas is N2, one of Ar, Ne, Kr or a variety of.
Preferably, the material of the nozzle of the oxygen rifle is one kind of the material of metal material or high temperature resistant erosion.
Preferably, the mode of the lime stone blowing is one of bottom blowing, top blast, side-blown or a variety of.
The invention has the benefit that
The present invention utilizes the resolution characteristic of lime stone, the advantage of jet metaurgy is utilized, by lime stone powder via rapidly
The product decomposed after heating effectively utilizes, wherein the process of CaO participation slag making dephosphorization, and CO2With C, Si, Mn etc. in molten iron
CO is generated after reaction, can continue to utilize, with low, the high-efficient advantage of cost of investment.
Detailed description of the invention
Fig. 1 is CO in a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization proposed by the present invention2It participates in
The thermodynamics limit schematic diagram of high-carbon low-temperature molten iron reaction.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
Embodiment one
S1, the raw material for preparing following parts by weight: 20 parts of iron powder, 2 parts of lime stone powder；
S2, it the iron powder of above-mentioned parts by weight is placed into corundum crucible generates molten iron, molten iron temperature control is at 1450 DEG C, iron
It is 0.38%, Mn content is 0.2% that carbon content, which is 4.5%, Si content, in water, P content 0.1%；
S3, by above-mentioned parts by weight lime stone powder with N2Be blown into molten iron for carrier by oxygen rifle, blowing the time be
10min；
S4, thermometric sampling analysis is carried out to finished product, molten iron temperature is 1395 DEG C, and molten iron carbon content is 4.32%, Si content
It is 0.16% for 0.28%, Mn content, P content 0.08%.
Embodiment two
S1, the raw material for preparing following parts by weight: 50 parts of pig iron, 5 parts of lime stone powder；
S2, it the pig iron of above-mentioned parts by weight is placed into vaccum sensitive stove generates molten iron, molten iron temperature is controlled 1500
DEG C, it be 0.3%, Mn content is 0.2% that carbon content, which is 4.2%, Si content, in molten iron, P content 0.15%；
S3, by above-mentioned parts by weight lime stone powder with N2Be blown into molten iron for carrier by oxygen rifle, blowing the time be
30min；
S4, thermometric sampling analysis is carried out to finished product, molten iron temperature is 1442 DEG C, carbon content 3.85%, and Si content is
0.12%, Mn content are 0.08%, P content 0.08%.
Embodiment three
S1, the raw material for preparing following parts by weight: 80 parts of ladle；
S2, it the ferriferous raw material of above-mentioned parts by weight is placed into molten iron container generates molten iron, molten iron temperature is controlled 1432
DEG C, it is 0.32% that wherein carbon content, which is 4.2%, Si content, in molten iron, P content 0.12%；
S3, the CO for being 100% by purity2With ton iron 3Nm3Air supply intensity be blown into molten iron by oxygen rifle, be blown the time
For 10min；
S4, thermometric sampling analysis is carried out to finished product, obtained molten iron temperature is 1401 DEG C, and carbon content 3.79%, Si contains
Amount is 0.14%, P content 0.11%.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (7)
1. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization, which comprises the following steps:
S1, the raw material for preparing following parts by weight: 20-80 parts of ferriferous raw material (iron powder, pig iron, ladle), lime stone powder 2-8
Part；
S2, the ferriferous raw material of above-mentioned parts by weight be placed into molten iron container generate molten iron, molten iron temperature control 1350 DEG C-
1500℃；
S3, above-mentioned parts by weight lime stone powder is blown into molten iron using carrier gas as carrier by oxygen rifle, blowing the time be
0.5min-30min；
S4, thermometric sampling analysis is carried out to finished product.
2. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In, in the molten iron carbon content be 2.5%-5%, Si content be 0.3%-0.4%, Mn content be 0.1%-0.3%, P content
For 0.1%-0.2%.
3. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In the granularity of the lime stone powder is 0.01mm-2mm.
4. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In the molten iron container is one of converter, ladle, corundum crucible, vaccum sensitive stove.
5. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In the carrier gas is N2, one of Ar, Ne, Kr or a variety of.
6. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In the material of the nozzle of the oxygen rifle is metal material or material one kind that high temperature resistant corrodes.
7. a kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization according to claim 1, feature exist
In the mode of the lime stone blowing is one of bottom blowing, top blast, side-blown or a variety of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352181.7A CN109929964A (en) | 2019-04-29 | 2019-04-29 | A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910352181.7A CN109929964A (en) | 2019-04-29 | 2019-04-29 | A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109929964A true CN109929964A (en) | 2019-06-25 |
Family
ID=66991087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910352181.7A Pending CN109929964A (en) | 2019-04-29 | 2019-04-29 | A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109929964A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795724A (en) * | 2020-12-28 | 2021-05-14 | 河钢股份有限公司承德分公司 | Method for accelerating slagging of converter smelting semisteel |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643946A (en) * | 2012-04-24 | 2012-08-22 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN102766724A (en) * | 2012-07-12 | 2012-11-07 | 东北大学 | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter |
| CN102796841A (en) * | 2012-08-21 | 2012-11-28 | 东北大学 | Method for slagging steelmaking by side blowing of powder particle limestone in top-bottom combined blown converter |
-
2019
- 2019-04-29 CN CN201910352181.7A patent/CN109929964A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102643946A (en) * | 2012-04-24 | 2012-08-22 | 北京科技大学 | Converter steelmaking method through power injection dephosphorization by adopting supersonic speed oxygen lance and supersonic speed oxygen lance |
| CN102766724A (en) * | 2012-07-12 | 2012-11-07 | 东北大学 | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter |
| CN102796841A (en) * | 2012-08-21 | 2012-11-28 | 东北大学 | Method for slagging steelmaking by side blowing of powder particle limestone in top-bottom combined blown converter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112795724A (en) * | 2020-12-28 | 2021-05-14 | 河钢股份有限公司承德分公司 | Method for accelerating slagging of converter smelting semisteel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108148942B (en) | A kind of converter slag stays slag gasification dephosphorization method and recycles smelting process | |
| CN104053794B (en) | Molten iron pretreatment method | |
| CN107299181B (en) | The method of converter gasification dephosphorized slag circulation dephosphorization steel-making | |
| CN105525055B (en) | A kind of control method of converter less-slag melting carbon period splash | |
| CN104294002B (en) | A kind of method introducing carbonic acid gas converter single stage method smelting middle-low-carbon ferrochrome | |
| CN102965463B (en) | Efficient dephosphorization process for converter | |
| CN101525678A (en) | Method of replacing lime with limestone for slagging and producing steel in oxygen top blown converter | |
| CN107419061A (en) | Bottom-blowing of converter dust improve gasification dephosphorization effect method | |
| WO2022227184A1 (en) | Comprehensive utilization method for bottom-top composite blowing smelting reduction of high-iron red mud | |
| CN109136456A (en) | A kind of method of converter application lime stone steel-making | |
| CN108264224A (en) | A kind of smelting process that slag is smelted into mineral wool material in convertor steelmaking process | |
| CN108085449B (en) | The method of the double slag production ultra-low phosphoretic steels of converter | |
| CN109762960A (en) | A kind of process control method reducing converter smelting lime consumption amount | |
| CN109929964A (en) | A kind of method of oxygen coverter high pressure blow smelting operation agstone slag making dephosphorization | |
| JP2007177295A (en) | Method for producing molten iron | |
| CN102766724A (en) | Method adopting oxygen lance to jet granulated powder limestone to make slag and steel in combined blown converter | |
| JPH0437132B2 (en) | ||
| CN214830453U (en) | Top-bottom side multi-point oxygen blowing purification converter | |
| CN108842027A (en) | A kind of dephosphorization converter finishing slag gasification dephosphorization method and smelting process | |
| CN101831525A (en) | Dephosphorization method for molten iron | |
| CN109112250A (en) | A kind of interior dephosphorization and the circulation utilization method of gasifying of semisteel smelting converter finishing slag furnace | |
| CN104328361A (en) | Anti-seismic steel bar and preparation method thereof | |
| CN107988457A (en) | A kind of molten iron pretreatment desiliconization agent and preparation method thereof | |
| CN114686641B (en) | Top-bottom side multipoint oxygen blowing purification converter and method | |
| CN106319154B (en) | A method of vortex is involved in carbon in lime stone removing cupric molten iron |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190625 |