CN102943146B - A kind of smelting iron and steel slagging method, iron and steel smelting process and slag making materials - Google Patents

A kind of smelting iron and steel slagging method, iron and steel smelting process and slag making materials Download PDF

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CN102943146B
CN102943146B CN201210422685.XA CN201210422685A CN102943146B CN 102943146 B CN102943146 B CN 102943146B CN 201210422685 A CN201210422685 A CN 201210422685A CN 102943146 B CN102943146 B CN 102943146B
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iron
steel
slag making
molten iron
smelting
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CN102943146A (en
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孙中强
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METALLURGY TECHNOLOGY RESEARCH INSTITUTE Co Ltd NORTHEAST UNIVERSITY
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METALLURGY TECHNOLOGY RESEARCH INSTITUTE Co Ltd NORTHEAST UNIVERSITY
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills

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  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

The present invention relates to a kind of smelting iron and steel slagging method, before described method is included in and molten iron is blended into steel melting furnace, utilize described molten iron slag making when molten iron is transferred to and contained molten iron container.The invention still further relates to and a kind ofly comprise the iron and steel smelting process of described smelting iron and steel slagging method and a kind of novel slag making materials.The present invention has following beneficial effect: the slag can making low melting point good fluidity, improves dephosphorization efficiency; Slag making materials utilization ratio is high, decreases the consumption of slag lime; A large amount of iron-contained waste materials of steel-making are utilized effectively, reduce the consumption of iron and steel stock; Significantly shorten tap to tap time, reduce oxygen depletion.

Description

A kind of smelting iron and steel slagging method, iron and steel smelting process and slag making materials
Technical field
The invention belongs to metallurgical technology field, particularly a kind of smelting iron and steel slagging method, a kind ofly comprise the iron and steel smelting process of described smelting iron and steel slagging method and a kind of novel slag making materials.
Background technology
Converter steel making method by by blast-melted be blended into converter after complete to oxygen blast in stove.Carbon in molten iron, silicon, manganese, phosphorus, sulphur etc. are adjusted in the scope that smelting technology requires by oxygen blast.Reach above-mentioned target to realize by making the slag with suitable basicity, oxidisability and good fluidity.
In existing convertor steelmaking process; slagging process is after molten iron is blended into converter; add in stove by slag making materials again, also having indivedual producer to be added before molten iron is blended into converter in stove by part lime for protecting furnace lining impact zone, there is slag making lag issues in this traditional technology.Slag making materials generally comprises lime, light dolomite etc.Because slag making materials fusing point is higher, and be often relatively large material (powdery or small-particle slag making materials can be siphoned away by converter dedusting line), can not melt in short period of time (generally needing 2min ~ 5min), can only to rely on after a large amount of ferric oxide enters slag could with the compound of its generation low melting point, after slag melting, bath temperature raises, misses best low temperature dephosphorization opportunity.For accelerationization slag, some steel mill drops into the promotionization residue materials such as calcium ferrite, sludge ball, Ferromanganese Ore to converter, but still does not tackle the problem at its root.This is because the additives such as calcium ferrite all need the fusing that heats up, still need the longer time, miss the best moment of low temperature dephosphorization equally.In addition, calcium ferrite cost is higher, constrains its usage quantity.In converter steelmaking slagging process, because the lumpiness adding slag charge is larger, change slag time various composition mutually merge more difficult, the specific surface area that contacts with each other is less, and mutual infiltrating time is longer, and it is still undesirable often to enter carbon period slag making, there will be expulsion events, not only waste a large amount of starting material, also easily bring security incident to smelting operation, exacerbate the damage of equipment simultaneously.
At present, each Iron And Steel Company blast furnace casting temperature is generally at about 1480 DEG C, and the molten iron temperature be blended in converter is at about 1300 DEG C, for reducing molten iron heat loss, usually adopts carbonization rice husk, Power Plant Ash etc. as heat preserving agent.These materials are low alkalinity material, can strengthen the burden that high basicity slag is made in later stage converter, increase lime consumption, consume amount of heat simultaneously.
A lot of Electric furnace steel making manufacturing enterprise, for shortening the heat, reducing energy consumption, also adopts molten iron to replace part steel scrap or the pig iron, therefore also faces the problems referred to above.
Summary of the invention
For the problems referred to above, the invention provides a kind of brand-new smelting iron and steel slagging method, the main points of this smelting iron and steel slagging method are: the part slag making of steel melting furnace and smelting task are moved forward to before molten iron is blended into steel melting furnace and carry out.
The principle of smelting iron and steel of the present invention and slagging method in Sheng molten iron container, adds slag making materials by multiple method when molten iron shifts, the physical thermal of molten iron, chemical heat and impact stirring action is utilized to make slag making materials preheating or fusing, carry out pre-slag making, provide the initial stage slag being beneficial to steel melting furnace dephosphorization.In pre-slag making simultaneously, also have part desiliconization, dephosphorisation reaction and carry out in advance.
Smelting iron and steel slagging method of the present invention can be implemented in the molten iron transfer process including but not limited to following four kinds of possible routes (a-d):
General tank → the steel melting furnace of (a) iron-smelting furnace → ironworks steel mill;
B iron flask → steel melting furnace is converted by iron flask → steel mill in () iron-smelting furnace → ironworks;
C iron flask → steel melting furnace is converted by iron flask → hot metal mixer → steel mill in () iron-smelting furnace → ironworks;
D iron flask → steel melting furnace is converted by () iron-smelting furnace → fish torpedo ladle → steel mill;
In Sheng molten iron container, slag making materials is added in above-mentioned molten iron transfer process.Above-mentioned molten iron transfer process can be contain molten iron container by iron-smelting furnace to one to shift, and also can be to contain molten iron container by one to contain the transfer of molten iron container to another.Described steel melting furnace can be converter or electric furnace.Described Sheng molten iron container can be: the general tank of ironworks steel mill (being called for short general tank), and ironworks is by iron flask (be called for short by iron flask), and iron flask (iron flask converted in abbreviation) is converted by steel mill, fish torpedo ladle, one or more in hot metal mixer.
For the present invention, some terms used in the application are defined as follows:
" pre-slag making " or " slag making " refer to that before molten iron is blended into steel melting furnace, add slag making materials when molten iron is transferred to and contained molten iron container utilizes described molten iron to carry out the technique of slag making.
" ferrous material " refers to primarily of Fe 2o 3, FeO, Fe 3o 4, FeCO 3, CaOFe 2o 3, 2CaOFe 2o 3in one or more materials be mixed to get.
TFe refers to the total content (with massfraction represent) of the ferrous material described in patent of the present invention through the determined ferro element of chemical analysis.
" largest contours size " refers to the overall dimension of particle or block material profile, is generally the size in three directions, that namely long, the widest, the highest size.
" total add-on of slag making materials " refers to the quality through the slag making materials added in ton iron obtained that converts, and unit is " kg/t iron".
" general tank by iron 1/4 ~ 3/4 process " refers to and is time Fixed Initial Point and the molten iron transfer process implemented to general tank limited for time end point with shifted molten iron total amount to general tank 3/4 to have shifted 1/4 of molten iron total amount to general tank.
" ironworks by iron flask by iron 1/4 ~ 3/4 process " refers to and be time Fixed Initial Point and with the 3/4 molten iron transfer process being subject to iron flask enforcement to ironworks limited for time end point having shifted molten iron total amount to ironworks by iron flask to have shifted 1/4 of molten iron total amount to ironworks by iron flask.
" steel mill convert iron flask by iron 1/4 ~ 3/4 process " refers to and has shifted 1/4 of molten iron total amount be time Fixed Initial Point and to convert the 3/4 molten iron transfer process converting iron flask enforcement to steel mill limited for time end point that iron flask has shifted molten iron total amount to steel mill to convert iron flask to steel mill.
Specifically, the present invention relates to the content of following many aspects:
1. a smelting iron and steel slagging method, is characterized in that, before molten iron is blended into steel melting furnace, utilizes described molten iron slag making when molten iron is transferred to and contained molten iron container.
2. the smelting iron and steel slagging method according to aspect 1, is characterized in that, the temperature range of the described molten iron that slag making utilizes is 1200 DEG C ~ 1550 DEG C; Preferably, the temperature range of described molten iron is 1380 DEG C ~ 1550 DEG C; Preferred, the temperature range of described molten iron is 1430 DEG C ~ 1550 DEG C.
3. the smelting iron and steel slagging method according to aspect 1 or 2, is characterized in that, described Sheng molten iron container is: general tank, and ironworks is by iron flask, and iron flask is converted by steel mill, fish torpedo ladle, one or more in hot metal mixer.
4. the smelting iron and steel slagging method according to aspect 1 or 2, is characterized in that, described steel melting furnace is converter or electric furnace.
5. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into general tank.
6. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making is undertaken by during iron flask the molten iron flowed out by iron-smelting furnace is directly blended into ironworks.
7. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by iron flask by ironworks by molten iron.
8. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making is undertaken by during iron flask and being transferred to when iron flask is converted by steel mill by iron flask by ironworks by molten iron the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
9. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making is carried out when molten iron is transferred to hot metal mixer by ironworks by iron flask.
10. the smelting iron and steel slagging method according to aspect 3, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron.
11. smelting iron and steel slagging methods according to aspect 3, is characterized in that, described slag making is undertaken by during iron flask and when molten iron is transferred to hot metal mixer by ironworks by iron flask the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
12. smelting iron and steel slagging methods according to aspect 3, is characterized in that, described slag making is carried out when molten iron is transferred to hot metal mixer by ironworks by iron flask and being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron.
13. smelting iron and steel slagging methods according to aspect 3, it is characterized in that, described slag making is undertaken by during iron flask and when molten iron is transferred to hot metal mixer by ironworks by iron flask and being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
14. smelting iron and steel slagging methods according to aspect 3, it is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into fish torpedo ladle.
15. smelting iron and steel slagging methods according to aspect 3, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by fish torpedo ladle by molten iron.
16. smelting iron and steel slagging methods according to aspect 3, is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into fish torpedo ladle and being transferred to when iron flask is converted by steel mill by fish torpedo ladle by molten iron.
17. smelting iron and steel slagging methods according to any one of aforementioned aspect 6-16, it is characterized in that, before the described Sheng molten iron container of pending slag making transferred to by molten iron, be that the slag making materials that will add in this Sheng molten iron container of 5% ~ 30% joins in the described Sheng molten iron container of pending slag making in advance by mass percent.
18. 1 kinds of iron and steel smelting process, described iron and steel smelting process comprises:
Before molten iron is blended into steel melting furnace, the smelting iron and steel slagging method according to any one of aspect 1-17 is adopted to utilize described molten iron slag making when molten iron is transferred to and contained molten iron container; And the molten iron through slag making is blended into steel melting furnace makes steel.
19. 1 kinds according to the slag making materials used in the method according to any one of in aforementioned, it is characterized in that, described slag making materials is the mixture comprising CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in ferrous material, preferable range is 41.4% ~ 46.7%, more preferably scope is 43.7% ~ 45.8%, CaO 19.0% ~ 32.0%, preferable range is 20.3% ~ 27.6%, more preferably scope is 21.7% ~ 24.3%, surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
20. slag making materialses according to aspect 19, it is characterized in that, described ferrous material is mainly Fe 2o 3, FeO, Fe 3o 4, FeCO 3, CaOFe 2o 3, 2CaOFe 2o 3in one or more.
21. slag making materialses according to aspect 19 or 20, it is characterized in that, other moiety described comprises MgO, K 2o, Na 2o, CaF 2in one or more, the mass percent that the chemical composition of above each material accounts for slag making materials is respectively:
MgO≤12%, preferable range is≤8%, and more preferably scope is≤6%, K 2o≤5%, preferable range is≤2%, and more preferably scope is≤1%, Na 2o≤10%, preferable range is≤7%, and more preferably scope is≤5%, CaF 2≤ 10%, preferable range is≤7%, and more preferably scope is≤5%, wherein K 2o, Na 2o adds with the form of respective carbonate.
22. slag making materialses according to any one of aforementioned aspect 19-21, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: the scope of the particle adopting granulation or briquetting apparatus to make the powder of mixing or the largest contours size of briquetting is 2mm ~ 60mm; The preferable range of the largest contours size of the particle that granulation obtains is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of the block material that briquetting obtains is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm;
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, is less than 5% to make slag material finished product water content.
23. slag making materialses according to any one of aforementioned aspect 19-22, it is characterized in that, the total add-on in the method for described slag making materials in such as according to any one of 1-16 is 5kg/t iron~ 40kg/t iron.
24. 1 kinds of slag making materialses, it is characterized in that, described slag making materials is the mixture comprising CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in ferrous material, preferable range is 41.4% ~ 46.7%, more preferably scope is 43.7% ~ 45.8%, CaO 19.0% ~ 32.0%, preferable range is 20.3% ~ 27.6%, more preferably scope is 21.7% ~ 24.3%, surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
25. slag making materialses according to aspect 24, it is characterized in that, described ferrous material is mainly Fe 2o 3, FeO, Fe 3o 4, FeCO 3, CaOFe 2o 3, 2CaOFe 2o 3in one or more.
26. slag making materialses according to aspect 24 or 25, it is characterized in that, other moiety described comprises MgO, K 2o, Na 2o, CaF 2in one or more, the mass percent that the chemical composition of above each material accounts for slag making materials is respectively:
MgO≤12%, preferable range is≤8%, and more preferably scope is≤6%, K 2o≤5%, preferable range is≤2%, and more preferably scope is≤1%, Na 2o≤10%, preferable range is≤7%, and more preferably scope is≤5%, CaF 2≤ 10%, preferable range is≤7%, and more preferably scope is≤5%, wherein K 2o, Na 2o adds with the form of respective carbonate.
27. slag making materialses according to any one of aforementioned aspect 24-26, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: the scope of the particle adopting granulation or briquetting apparatus to make the powder of mixing or the largest contours size of block material is 2mm ~ 60mm; The preferable range of the largest contours size of the particle that granulation obtains is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of the block material that briquetting obtains is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm;
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, is less than 5% to make slag material finished product water content.
28. slag making materialses according to any one of aforementioned aspect 24-27, it is characterized in that, total add-on of described slag making materials is 5kg/t iron~ 40kg/t iron.
The present invention has following beneficial effect especially:
(1) the present invention can make the slag of low melting point good fluidity, can reduce tapping temperature for double-slag operation, improves dephosphorization efficiency, reduces iron loss, significant for the producer smelting high phosphorus hot metal.
(2) owing to reducing the fusing point of slag, improve the effective CaO in slag, both improve the activity of CaO, slag making materials utilization ratio is high, decreases the consumption of slag lime.
(3) slag making materials of the present invention can utilize the ferrous material such as steel-making, ironmaking dedusting ash, iron containing sludge, refractory iron ore, a large amount of iron-contained waste material of steel-making and dull ore deposit is utilized effectively, reduces the consumption of iron and steel stock.
(4) adopt slag making materials of the present invention to have heat insulation function, replace the lagging material that existing technique contains molten iron upper vessel portion.
(5) due to pre-slag making, make steel melting furnace rapid slagging in early stage, reduce oxygen depletion, shorten tap to tap time.
Figure of description
Fig. 1 schematically shows according to the multiple possible molten iron transferring route in the smelting iron and steel slagging process method of the embodiment of the present invention.
Embodiment
Below in conjunction with Figure of description, the specific embodiment of the present invention is described in detail, but it is pointed out that protection scope of the present invention not by the restriction of these embodiments, but determined by claims.
The present invention relates to a kind of brand-new steelmaking slagging technique, the key point of this slagging process the part slag making of steel melting furnace and smelting task is moved forward to before molten iron is blended into steel melting furnace to carry out.
Below the concrete steps of this steelmaking slagging technique are described:
(1) slag making materials is prepared
Adopt the slag making materials prepared slagging process of the present invention with the following method and use:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of mentioned component, particle diameter is less than or equal to 5mm; After above-mentioned powder fully mixes, the specific surface area that various material contacts with each other can be increased, improve mass transfer condition, thus shorten the fusing time of slag charge.Existing smelting slag making technique joins in stove by the block material of one matter, and because material lumpiness is comparatively large, reaction mass transfer condition is poor, and the fusing slag making time is long.
Granulation or briquetting: the scope of the particle adopting granulation or briquetting apparatus to make the powder of mixing or the largest contours size of block material is 2mm ~ 60mm; The preferable range of the largest contours size of the particle that granulation obtains is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of the block material that briquetting obtains is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm.Largest contours size is too little, easily forms dust, and wettability is poor; Largest contours size is too large, and melting heat transfer is bad.During employing briquetting apparatus briquetting, block material is too little, and production efficiency is too low, is unfavorable for producing.Term " largest contours size " used in this application refers to the overall dimension of particle or block material profile, is generally the size in three directions, that namely long, the widest, the highest size.
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, requires that slag making materials finished product water content is less than 5%.
Made slag making materials is the mixture comprising CaO and ferrous material, and its chemical composition is: ferrous material (is mainly Fe 2o 3, FeO, Fe 3o 4, FeCO 3, CaOFe 2o 3, 2CaOFe 2o 3in one or more mixing) in TFe 38.0% ~ 47.5%, preferable range is 41.4% ~ 46.7%, more preferably scope is 43.7% ~ 45.8%, CaO 19.0% ~ 32.0%, preferable range is 20.3% ~ 27.6%, and more preferably scope is 21.7% ~ 24.3%, surplus is other moiety and inevitable impurity such as silicon-dioxide etc., and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
Other moiety described can comprise MgO, K 2o, Na 2o, CaF 2in one or more, the ratio that wherein chemical composition of each material accounts for slag making materials respectively according to mass percent is: MgO≤12%, and preferable range is≤8%, and more preferably scope is≤6%, K 2o≤5%, preferable range is≤2%, and more preferably scope is≤1%, Na 2o≤10%, preferable range is≤7%, and more preferably scope is≤5%, CaF 2≤ 10%, preferable range is≤7%, and more preferably scope is≤5%, wherein K 2o, Na 2o adds with the form of respective carbonate.
Slag making materials of the present invention can comprise further containing compounds such as potassium, sodium, calcium, magnesium, thus reduce slag charge fusing point further, slag making materials of the present invention can also comprise well known in the art other can reduce the compound of fusing point, as the compound of boron, barium etc.It is lower that slag charge fusing point is joined by institute, and the slag making materials that can melt under the same conditions is more.
(2) the adding of slag making materials
Be blended in steel melting furnace forward direction Sheng molten iron container at molten iron and add 5 kg/t iron~ 40kg/t ironthe slag making materials prepared.Certainly, those skilled in the art also can recognize: although be not preferably, in slagging process of the present invention, also can use the slag making materials slag making that the lumpiness of prior art is larger.The temperature range of the described molten iron that slag making of the present invention utilizes is 1200 DEG C ~ 1550 DEG C; Preferably, the temperature range of described molten iron is 1380 DEG C ~ 1550 DEG C; Preferred, the temperature range of described molten iron is 1430 DEG C ~ 1550 DEG C.Within the scope of said temperature, the temperature of described molten iron is higher, is more conducive to slagging.Described steel melting furnace is converter or electric furnace.Described Sheng molten iron container is: the general tank of ironworks steel mill (being called for short general tank), and ironworks is by iron flask (be called for short by iron flask), and iron flask (iron flask converted in abbreviation) is converted by steel mill, fish torpedo ladle, one or more in hot metal mixer.Those skilled in the art can recognize: under the prerequisite that the insulation of containing molten iron container can be ensured well, improve heat utilization efficiency as much as possible, simultaneously by controlling the composition proportion of each material in slag charge, obtain the slag charge that fusing point is lower, the add-on of slag making materials can be greater than 40kg/t in these cases iron.
It is in Sheng molten iron container, add slag material by multiple method when molten iron shifts that the present invention adds slag making materials side's ratio juris, the physical thermal of molten iron, chemical heat and impact stirring action is utilized to make slag making materials preheating or fusing, carry out pre-slag making, provide the initial stage slag being beneficial to steel melting furnace dephosphorization.
Fig. 1 schematically shows according to the multiple possible molten iron transferring route in the smelting iron and steel slagging process method of the embodiment of the present invention.The concrete technology route of steelmaking slagging technique of the present invention can be:
A (), when the molten iron flowed out by iron-smelting furnace is transferred directly to general tank, adds the above-mentioned slag making materials prepared;
B () makes the molten iron flowed out by iron-smelting furnace first transfer to ironworks by iron flask, then transfer to steel mill by ironworks by iron flask and convert in iron flask, is added in steel melting furnace by the molten iron completing pre-slag making task and makes steel.Can select in this process to transfer to ironworks by adding the above-mentioned slag making materials prepared during iron flask at molten iron, also can select to add the above-mentioned slag making materials prepared being transferred to when iron flask is converted by steel mill by iron flask by ironworks, can also select to transfer to ironworks by adding part (such as 20% ~ 50%) the above-mentioned slag making materials prepared during iron flask at molten iron, simultaneously being transferred to the above-mentioned slag making materials prepared adding remainder when iron flask is converted by steel mill by iron flask by ironworks, the feed postition of above three kinds of slag making materialses satisfactorily can complete pre-slag making task;
C () makes the molten iron flowed out by iron-smelting furnace first transfer to ironworks by iron flask, then transfer to hot metal mixer by ironworks by iron flask, then is transferred to steel mill by hot metal mixer and converts in iron flask, is added in steel melting furnace by the molten iron completing pre-slag making task and makes steel.Can select in this process to transfer to ironworks by adding all above-mentioned slag making materialses prepared during iron flask at molten iron; Also can select to add all above-mentioned slag making materialses prepared when transferring to hot metal mixer by ironworks by iron flask; Also can select to add all above-mentioned slag making materialses prepared being transferred to by hot metal mixer when iron flask is converted by steel mill; Can also selecting to transfer to ironworks by adding part (such as 20% ~ 50%) the above-mentioned slag making materials prepared during iron flask at molten iron, adding the above-mentioned slag making materials prepared of remainder simultaneously when transferring to hot metal mixer by ironworks by iron flask; The above-mentioned slag making materials prepared added when molten iron transfers to hot metal mixer by ironworks by iron flask can also be selected, simultaneously being transferred to the above-mentioned slag making materials prepared adding remainder when iron flask is converted by steel mill by hot metal mixer; Can also select to transfer to ironworks by adding part (such as 20% ~ 50%) the above-mentioned slag making materials prepared during iron flask at molten iron, simultaneously being transferred to the above-mentioned slag making materials prepared adding remainder when iron flask is converted by steel mill by hot metal mixer; Can also select to transfer to ironworks by adding part (such as 20% ~ 40%) the above-mentioned slag making materials prepared during iron flask at molten iron, add part (such as 20% ~ 40%) the above-mentioned slag making materials prepared when transferring to hot metal mixer by ironworks by iron flask simultaneously, while being transferred to the above-mentioned slag making materials prepared adding remainder when iron flask is converted by steel mill by hot metal mixer; The feed postition of above seven kinds of slag making materialses satisfactorily can complete pre-slag making task;
D () makes the molten iron flowed out by iron-smelting furnace first transfer to fish torpedo ladle, then transfer to steel mill by fish torpedo ladle and convert iron flask, is added in steel melting furnace by the molten iron completing pre-slag making task and makes steel.Can select in this process to add all above-mentioned slag making materialses prepared when fish torpedo ladle transferred to by molten iron; Also can select to add all above-mentioned slag making materialses prepared being transferred to by fish torpedo ladle when iron flask is converted by steel mill; Can also select to add when fish torpedo ladle transferred to by molten iron part (such as 20% ~ 50%) the above-mentioned slag making materials prepared, simultaneously being transferred to the above-mentioned slag making materials prepared adding remainder when iron flask is converted by steel mill by fish torpedo ladle; The feed postition of above three kinds of slag making materialses satisfactorily can complete pre-slag making task.
In each concrete technology route of the steelmaking slagging technique of the present invention in above (a)-(d), before a certain Sheng molten iron container of the pending slag making can also transferred at molten iron, the slag making materials that in advance part can will be added in this Sheng molten iron container (preferably 5% ~ 30%) joins in this Sheng molten iron container, and above involved percent data is mass percentage.
Invention further discloses a kind of iron and steel smelting process comprising above-mentioned brand-new steelmaking slagging technique.Described iron and steel smelting process comprises the following steps: smelt iron in iron-smelting furnace; Described molten iron slag making is utilized when being transferred to by the molten iron from iron-smelting furnace and containing molten iron container; Described molten iron through slag making is blended into steel melting furnace make steel.
(3) the present invention has following beneficial effect especially
1. the present invention can make the slag of low melting point good fluidity, can reduce tapping temperature for double-slag operation, improves dephosphorization efficiency, can improve 3.0% ~ 18.4%, significantly reduce iron loss, significant for the producer smelting high phosphorus hot metal.
2. owing to reducing the fusing point of slag, improve the effective CaO in slag, both improve the activity of CaO, slag making materials utilization ratio is high, decreases the consumption of slag lime, and reduction can reach 1.0 kg/t steel~ 35.1 kg/t steel.
3. slag making materials of the present invention can utilize the ferrous material such as steel-making, ironmaking dedusting ash, iron containing sludge, refractory iron ore, and a large amount of iron-contained waste materials of steel-making are utilized effectively, reduce the consumption of iron and steel stock, reducing amount can reach 2.6 kg/t steel~ 24.8 kg/t steel.
4. adopt slag making materials of the present invention to have heat insulation function, replace the lagging material that existing technique contains molten iron upper vessel portion.
5. due to pre-slag making, make the rapid slagging in early stage of steel melting furnace, significantly reduce converter smelting time, oxygen supply time, the oxygen supply time of minimizing can reach 8s ~ 103s, reduces oxygen depletion.Also shorten tap to tap time to electric furnace hot-mounting process, the shortening time can reach 51s ~ 121s.
Embodiment
Present invention is described in further detail below to adopt embodiment, but the present invention is not limited to these embodiments below.
Slag making materials parameter table look-up (percent data is in the table mass percentage) used in embodiments of the present invention is listed in following table 1.
Table 1
The molten iron temperature mentioned in following embodiment bracket is survey the molten iron temperature obtained in the equipment before bracket, such as: in embodiment 1,1470 DEG C is the molten iron temperature in iron-smelting furnace.
Embodiment 1
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 110.75t, adding amount of scrap steel: 23.75t, tap: 125t.
According to the requirement of this factory's blast furnace casting temperature (1470 DEG C) and process for making, by the material of material number 2 according to operational path iron-smelting furnace (molten iron temperature: 1470 DEG C) → general tank of ironworks steel mill (molten iron temperature: 1340 DEG C) → steel melting furnace, at general tank by disposable input 100kg slag charge at the bottom of iron forward universal tank tank, all the other 454 kg slag charges add by iron process continuously at general tank.
Test-results is as shown in table 2:
Can be seen by the test-results shown in table 2, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 9s; Lime consumption amount decreases 2.1kg/t steel; Dephosphorization efficiency improves 4.8%; Steel technology amount reduces 2.6kg/t steel.
Embodiment 2
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 160.38t, adding amount of scrap steel: 40.4t, tap: 188t.
According to the requirement of this factory's blast furnace casting temperature (1530 DEG C) and process for making, by the material of material number 1 according to operational path iron-smelting furnace (molten iron temperature: 1530 DEG C) → general tank of ironworks steel mill (molten iron temperature: 1340 DEG C) → steel melting furnace, drop into 6351kg slag charge at general tank continuously by iron 1/4 ~ 3/4 process.
Test-results is as shown in table 3:
Test-results as shown in Table 3 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 81s; Lime consumption decreases 11.2kg/t steel; Dephosphorization efficiency improves 10.2%; Steel technology reduces 24.8kg/t steel.
Embodiment 3
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 90.25t, adding amount of scrap steel: 15.2t, tap: 95t.
According to the requirement of this factory's blast furnace casting temperature (1508 DEG C) and process for making, the material of material number 6 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1508 DEG C) → ironworks by iron flask (molten iron temperature: 1410 DEG C) → hot metal mixer → steel mill, continuously drops into 1444 kg slag charges by iron flask by iron 1/4 ~ 3/4 process in ironworks.
Test-results is as shown in table 4:
Can be seen by the test-results shown in table 4, adopt processing method of the present invention can reach following beneficial effect (compared with the existing technique identical with steel-making task):
Oxygen supply time shortens 51s; Lime consumption decreases 6.0kg/t steel; Dephosphorization efficiency improves 8.1%; Steel technology reduces 9.7kg/t steel.
Embodiment 4
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 157.5t, adding amount of scrap steel: 36.9t, tap: 180t.
According to the requirement of this factory's blast furnace casting temperature (1520 DEG C) and process for making, the material of material number 7 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1520 DEG C) → ironworks by iron flask (molten iron temperature: 1415 DEG C) → hot metal mixer → steel mill, add 945kg by iron flask by before iron in ironworks, all the other 2362kg slag charges add by iron process by iron flask continuously in ironworks.
Test-results is as shown in table 5:
Can be seen by the test-results shown in table 5, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 48s; Lime consumption decreases 6.1kg/t steel; Dephosphorization efficiency improves 9.0%; Steel technology reduces 13.4kg/t steel.
Embodiment 5
The 250 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 219.33t, adding amount of scrap steel: 51.87t, tap: 247t.
According to the requirement of this factory's blast furnace casting temperature (1505 DEG C) and process for making, the material of material number 9 is converted iron flask (molten iron temperature: 1300 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1505 DEG C) → ironworks by iron flask → hot metal mixer (molten iron temperature: 1420 DEG C) → steel mill, convert iron flask in steel mill and add 1100kg by before iron, convert iron flask in steel mill and add 3725kg continuously by iron process.
Test-results is as shown in table 6:
Test-results as shown in Table 6 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 52s; Lime consumption decreases 8.1kg/t steel; Dephosphorization efficiency improves 8.9%; Steel technology reduces 12.5kg/t steel.
Embodiment 6
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 107.0 tons, adding amount of scrap steel: 25.75t, tap: 125t.
According to the requirement of this factory's blast furnace casting temperature (1530 DEG C) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1370 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1530 DEG C) → ironworks by iron flask (molten iron temperature: 1470 DEG C) → hot metal mixer (molten iron temperature: 1445 DEG C) → steel mill, 500kg is added by iron flask by before iron in ironworks, continuously add 1175kg by iron flask by iron process in ironworks, steel mill converts iron flask and adds 1000kg continuously by iron process.
Test-results is as shown in table 7:
Test-results as shown in Table 7 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 44s; Lime consumption decreases 11.0kg/t steel; Dephosphorization efficiency carries 14.0%; Steel technology reduces 15.3kg/t steel.
Embodiment 7
The 80 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 75.735t, adding amount of scrap steel: 15.3t, tap: 85t.
According to the requirement of this factory's blast furnace casting temperature (1505 DEG C) and process for making, the material of material number 8 is converted iron flask (molten iron temperature: 1380 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1505 DEG C) → ironworks by iron flask (molten iron temperature: 1465 DEG C) → hot metal mixer (molten iron temperature: 1440 DEG C) → steel mill, 800kg is added by iron flask continuously by iron process in ironworks, steel mill converts iron flask and adds 140kg by before iron, and steel mill converts iron flask and adds 423kg continuously by iron process.
Test-results is as shown in table 8:
Can be seen by the test-results shown in table 8, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 34s; Lime consumption decreases 6.2kg/t steel; Dephosphorization efficiency improves 9.6%; Steel technology reduces 10.7kg/t steel.
Embodiment 8
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 97.125t, adding amount of scrap steel: 19.425t, tap: 105t.
According to the requirement of this factory's blast furnace casting temperature (1500 DEG C) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1330 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1500 DEG C) → ironworks by iron flask (molten iron temperature: 1445 DEG C) → hot metal mixer (molten iron temperature: 1410 DEG C) → steel mill, 500kg is added by iron flask by before iron in ironworks, 1000kg is added by iron flask continuously by iron process in ironworks, steel mill converts iron flask and adds 200kg by before iron, and steel mill converts iron flask and adds 728kg continuously by iron process.
Test-results is as shown in table 9:
Test-results as shown in Table 9 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 45s; Lime consumption decreases 35.1kg/t steel; Dephosphorization efficiency improves 9.5%; Steel technology reduces 15.3kg/t steel.
Embodiment 9
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 110.0t, adding amount of scrap steel: 22.5t, tap: 125t.
According to the requirement of this factory's blast furnace casting temperature (1495 DEG C) and process for making, the material of material number 3 is converted iron flask (molten iron temperature: 1320 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1495 DEG C) → ironworks by iron flask → hot metal mixer (molten iron temperature: 1410 DEG C) → steel mill, converts iron flask in steel mill and drop into 550kg continuously by iron 1/4 ~ 3/4 process.
Test-results is as shown in table 10:
Can be seen by the test-results shown in table 10, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 11s; Lime consumption decreases 1.3kg/t steel; Dephosphorization efficiency improves 3.0%; Steel technology reduces 3.3kg/t steel.
Embodiment 10
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 157.5t, adding amount of scrap steel: 36.0t, tap: 180t.
According to the requirement of this factory's blast furnace casting temperature (1478 DEG C) and process for making, the material of material number 4 is converted iron flask (molten iron temperature: 1330 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1478 DEG C) → ironworks by iron flask (molten iron temperature: 1420 DEG C) → hot metal mixer (molten iron temperature: 1400 DEG C) → steel mill, continuously add 700kg by iron flask by iron process in ironworks, convert iron flask in steel mill and add 560kg continuously by iron process.
Test-results is as shown in table 11:
Test-results as shown in Table 11 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 16s; Lime consumption decreases 3.1kg/t steel; Dephosphorization efficiency improves 5.1%; Steel technology reduces 4.6kg/t steel.
Embodiment 11
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 150.304t, adding amount of scrap steel: 37.84t, tap: 176t.
According to the requirement of this factory's blast furnace casting temperature (1490 DEG C) and process for making, the material of material number 5 is converted iron flask (molten iron temperature: 1310 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1490 DEG C) → ironworks by iron flask (molten iron temperature: 1430 DEG C) → steel mill, continuously add 1450kg by iron flask by iron process in ironworks, convert iron flask in steel mill and add 805kg continuously by iron process.
Test-results is as shown in table 12:
Test-results as shown in Table 12 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 33s; Lime consumption decreases 4.1kg/t steel; Dephosphorization efficiency improves 9.6%; Steel technology reduces 9.8kg/t steel.
Embodiment 12
The 250 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 222.0t, adding amount of scrap steel: 52.5t, tap: 250t.
According to the requirement of this factory's blast furnace casting temperature (1550 DEG C) and process for making, the material of material number 1 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1550 DEG C) → ironworks by iron flask (molten iron temperature: 1400 DEG C) → steel mill, continuously adds 8791kg by iron flask by iron process in ironworks.
Test-results is as shown in table 13:
Test-results as shown in Table 13 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 103s; Lime consumption decreases 11.4kg/t steel; Dephosphorization efficiency improves 9.2%; Steel technology reduces 24.8kg/t steel.
Embodiment 13
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 112.5t, adding amount of scrap steel: 21.25t, tap: 125t.
According to the requirement of this factory's blast furnace casting temperature (1515 DEG C) and process for making, the material of material number 9 is converted iron flask (molten iron temperature: 1360 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1515 DEG C) → ironworks by iron flask (molten iron temperature: 1465 DEG C) → steel mill, converts iron flask in steel mill and add 2475kg continuously by iron process.
The test-results obtained is as shown in table 14:
Test-results as shown in Table 14 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 37s; Lime consumption decreases 6.6kg/t steel; Dephosphorization efficiency improves 8.5%; Steel technology reduces 12.5kg/t steel.
Embodiment 14
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 94.76t, adding amount of scrap steel: 16.48t, tap: 103t.
According to the requirement of this factory's blast furnace casting temperature (1472 DEG C) and process for making, the material of material number 2 is converted iron flask (molten iron temperature: 1345 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1472 DEG C) → ironworks by iron flask (molten iron temperature: 1420 DEG C) → steel mill, convert iron flask in steel mill and add 100kg by before iron, convert iron flask in steel mill and add 374kg continuously by iron process.
Test-results is as shown in Table 15:
Test-results as shown in Table 15 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 8s; Lime consumption decreases 4.0kg/t steel; Dephosphorization efficiency improves 3.7%; Steel technology reduces 2.6kg/t steel.
Embodiment 15
The 60 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 60.125t, adding amount of scrap steel: 9.1t, tap: 65t.
According to the requirement of this factory's blast furnace casting temperature (1522 DEG C) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1320 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1522 DEG C) → ironworks by iron flask (molten iron temperature: 1430 DEG C) → steel mill, 200kg is added by iron flask by before iron in ironworks, continuously add 800kg by iron flask by iron process in ironworks, convert iron flask in steel mill and add 503kg continuously by iron process.
Test-results is shown in table 16:
Test-results as shown in Table 16 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 38 s; Lime consumption decreases 10.5kg/t steel; Dephosphorization efficiency improves 18.4%; Steel technology reduces 15.3kg/t steel.
Embodiment 16
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 111.25t, adding amount of scrap steel: 22.5t, tap: 125t.
According to the requirement of this factory's blast furnace casting temperature (1506 DEG C) and process for making, the material of material number 8 is converted iron flask (molten iron temperature: 1325 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1506 DEG C) → ironworks by iron flask (molten iron temperature: 1445 DEG C) → steel mill, 1000kg is added by iron flask continuously by iron process in ironworks, convert iron flask in steel mill and add 160kg by before iron, convert iron flask in steel mill and add 843kg continuously by iron process.
Test-results is shown in table 17:
Test-results as shown in Table 17 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 34s; Lime consumption decreases 8.8kg/t steel; Dephosphorization efficiency improves 12.0%; Steel technology reduces 10.7kg/t steel.
Embodiment 17
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 158.844t, adding amount of scrap steel: 36.6t, tap: 183t.
According to the requirement of this factory's blast furnace casting temperature (1475 DEG C) and process for making, the material of material number 3 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1475 DEG C) → ironworks by iron flask (molten iron temperature: 1365 DEG C) → steel mill, add 100kg by iron flask by before iron in ironworks, all the other 694kg slag charges add by iron process by iron flask continuously in ironworks.
Test-results such as table 18 shows:
The test-results shown by table 18 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 12s; Lime consumption decreases 1.0kg/t steel; Dephosphorization efficiency improves 4.1%; Steel technology reduces 3.3kg/t steel.
Embodiment 18
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 99.54t, adding amount of scrap steel: 16.8t, tap: 105t.
According to the requirement of this factory's blast furnace casting temperature (1498 DEG C) and process for making, the material of material number 6 is converted iron flask (molten iron temperature: 1295 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1498 DEG C) → ironworks by iron flask (molten iron temperature: 1413 DEG C) → steel mill, 200kg is added by iron flask by before iron in ironworks, 840kg is added by iron flask continuously by iron process in ironworks, convert iron flask in steel mill and add 153kg by before iron, convert iron flask in steel mill and add 400kg continuously by iron process.
Test-results is as table 19:
Result can be seen as shown in Table 19, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 47s; Lime consumption decreases 10.9kg/t steel; Dephosphorization efficiency improves 7.5%; Steel technology reduces 9.7kg/t steel.
Embodiment 19
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 97.65t, adding amount of scrap steel: 16.8t, tap: 105t.
According to the requirement of this factory's blast furnace casting temperature (1528 DEG C) and process for making, the material of material number 7 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1528 DEG C) → fish torpedo ladle (molten iron temperature: 1425 DEG C) → steel mill, adds 2050kg at fish torpedo ladle continuously by iron process.
Test-results is shown in table 20:
Test-results as shown in Table 20 can be seen, compared with the existing technique identical with steel-making task, adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 66s; Lime consumption decreases 14.6kg/t steel; Dephosphorization efficiency improves 8.5%; Steel technology reduces 13.4kg/t steel.
Embodiment 20
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q195, the molten iron amount of being blended into: 157.38t, adding amount of scrap steel: 34.77t, tap: 183t.
According to the requirement of this factory's blast furnace casting temperature (1526 DEG C) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1330 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1526 DEG C) → fish torpedo ladle (molten iron temperature: 1440 DEG C) → steel mill, add 1800kg at fish torpedo ladle continuously by iron process, convert iron flask in steel mill and add 2134kg continuously by iron process.
Test-results is shown in table 21:
Can be seen by the test-results shown in table 21, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 56s; Lime consumption decreases 9.8kg/t steel; Dephosphorization efficiency improves 12.8%; Steel technology reduces 15.3kg/t steel.
Embodiment 21
The 250 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 222.0t, adding amount of scrap steel: 52.5t, tap: 250t.
According to the requirement of this factory's blast furnace casting temperature (1485 DEG C) and process for making, the material of material number 4 is converted iron flask (molten iron temperature: 1325 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1485 DEG C) → fish torpedo ladle (molten iron temperature: 1421 DEG C) → steel mill, convert iron flask in steel mill and add 176kg by before iron, convert iron flask in steel mill and add 1600kg continuously by iron process.
Test-results is shown in table 22:
Can be seen by the test-results shown in table 22, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 19s; Lime consumption decreases 3.1kg/t steel; Dephosphorization efficiency improves 4.7%; Steel technology reduces 4.6kg/t steel.
Embodiment 22
The 120 tons of converters of certain steel mill are applied the method test, produces steel grade: SPHC, the molten iron amount of being blended into: 105.48t, adding amount of scrap steel: 22.8t, tap: 120t.
According to the requirement of this factory's blast furnace casting temperature (1516 DEG C) and process for making, the material of material number 8 is converted iron flask (molten iron temperature: 1315 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1516 DEG C) → fish torpedo ladle (molten iron temperature: 1442 DEG C) → steel mill, 200kg is added by before iron at fish torpedo ladle, add 938kg at fish torpedo ladle continuously by iron process, convert iron flask in steel mill and add 760kg continuously by iron process.
Test-results is shown in table 23:
Can be seen by the test-results shown in table 23, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 33s; Lime consumption decreases 7.5kg/t steel; Dephosphorization efficiency improves 9.7%; Steel technology reduces 10.7kg/t steel.
Embodiment 23
The 60 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 63.98t, adding amount of scrap steel: 10.5t, tap: 70t.
According to the requirement of this factory's blast furnace casting temperature (1482 DEG C) and process for making, the material of material number 3 is converted iron flask (molten iron temperature: 1340 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1482 DEG C) → fish torpedo ladle (molten iron temperature: 1444 DEG C) → steel mill, converts iron flask in steel mill and add 320kg continuously by iron process.
Test-results is shown in table 24:
Can be seen by the test-results shown in table 24, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 9s; Lime consumption decreases 1.4kg/t steel; Dephosphorization efficiency improves 4.5%; Steel technology reduces 3.3kg/t steel.
Embodiment 24
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 88.3t, adding amount of scrap steel: 18.5t, tap: 100t.
According to the requirement of this factory's blast furnace casting temperature (1487 DEG C) and process for making, the material of material number 5 is converted iron flask (molten iron temperature: 1300 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1487 DEG C) → fish torpedo ladle (molten iron temperature: 1426 DEG C) → steel mill, 525kg is added continuously by iron process at fish torpedo ladle, convert iron flask in steel mill and add 200kg by before iron, convert iron flask in steel mill and add 600kg continuously by iron process.
Test-results is as shown in Table 25:
Can be seen by the test-results shown in table 25, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 28s; Lime consumption decreases 5.1kg/t steel; Dephosphorization efficiency improves 7.3%; Steel technology reduces 9.8kg/t steel.
Embodiment 25
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 159.66t, adding amount of scrap steel: 33.3t, tap: 180t.
According to the requirement of this factory's blast furnace casting temperature (1517 DEG C) and process for making, the material of material number 9 is converted iron flask (molten iron temperature: 1300 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1517 DEG C) → fish torpedo ladle (molten iron temperature: 1427 DEG C) → steel mill, 300kg is added by before iron at fish torpedo ladle, 1800kg is added continuously by iron process at fish torpedo ladle, convert iron flask in steel mill and add 153kg by before iron, convert iron flask in steel mill and add 1260kg continuously by iron process.
Test-results is shown in table 26:
Can be seen by the test-results shown in table 26, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 46s; Lime consumption decreases 6.3kg/t steel; Dephosphorization efficiency improves 9.5%; Steel technology reduces 12.5kg/t steel.
Embodiment 26
The 100 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 95.4t, adding amount of scrap steel: 17.49t, tap: 106t.
According to the requirement of this factory's blast furnace casting temperature (1516 DEG C) and process for making, the material of material number 10 is converted iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1516 DEG C) → fish torpedo ladle (molten iron temperature: 1407 DEG C) → steel mill, add 385kg at fish torpedo ladle by before iron, add 2000kg at fish torpedo ladle continuously by iron process.
Test-results is shown in table 27:
Can be seen by the test-results shown in table 27, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time contracting 48s; Lime consumption decreases 8.5kg/t steel; Dephosphorization efficiency improves 11.2%; Steel technology reduces 15.3kg/t steel.
Embodiment 27
Certain steel mill 100 tons of electric furnaces are applied the method test, and this factory adopts electric furnace hot-mounting process hot metal charging than 70%, and namely every stove is blended into molten iron 77 tons, and slag steel is blended into simultaneously, and all the other are steel scrap.Producing steel grade is bearing steel, tap 110t.
According to the requirement of this factory's blast furnace casting temperature (1500 DEG C) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1316 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1500 DEG C) → fish torpedo ladle (molten iron temperature: 1439 DEG C) → steel mill, convert iron flask in steel mill and add 450kg by before iron, convert iron flask in steel mill and add 1475kg continuously by iron process.
Test-results is shown in table 28:
Can be seen by the test-results shown in table 28, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Tap to tap time shortens 121s; Lime consumption decreases 5.5kg/t steel; Dephosphorization efficiency improves 9.8%; Steel technology reduces 10.7kg/t steel.
Embodiment 28
Certain steel mill 100 tons of electric furnaces are applied the method test, and this factory adopts electric furnace hot-mounting process hot metal charging than 70%, and namely every stove is blended into molten iron 80.5 tons, and slag steel is blended into simultaneously, and all the other are steel scrap.Producing steel grade is bearing steel, tap 115 tons.
According to the requirement of this factory's blast furnace casting temperature (1476 DEG C) and process for making, the material of material number 3 is converted iron flask (molten iron temperature: 1362 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1476 DEG C) → ironworks by iron flask → hot metal mixer (molten iron temperature: 1427 DEG C) → steel mill, converts iron flask in steel mill and add 403kg continuously by iron process.
Test-results is shown in table 29:
Can be seen by the test-results shown in table 29, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Tap to tap time shortens 51s; Lime consumption decreases 1.2kg/t steel; Dephosphorization efficiency improves 4.7%; Steel technology reduces 4.6kg/t steel.
Embodiment 29
The 180 tons of converters of certain steel mill are applied the method test, produces steel grade: Q235B, the molten iron amount of being blended into: 150.304t, adding amount of scrap steel: 37.84t, tap: 176t.
According to the requirement of this factory's blast furnace casting temperature (1470 DEG C) and process for making, the material of material number 2 is converted iron flask (molten iron temperature: 1201 DEG C) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1470 DEG C) → ironworks by iron flask (molten iron temperature: 1230 DEG C) → steel mill, continuously add 526kg by iron flask by iron process in ironworks, convert iron flask in steel mill and add 225kg continuously by iron process.
Test-results is shown in table 30:
Can be seen by the test-results shown in table 30, compared with the existing technique identical with steel-making task, adopt processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 23s; Lime consumption decreases 1.9kg/t steel; Dephosphorization efficiency improves 4.6%; Steel technology reduces 2.8kg/t steel.
Although be described in detail the specific embodiment of the present invention above in conjunction with the embodiments, it is pointed out that protection scope of the present invention not by the restriction of these embodiments, but determined by appending claims.Those skilled in the art can carry out suitable change to these embodiments in the scope not departing from technological thought of the present invention and purport, and the embodiment after these changes is obviously also included within protection scope of the present invention.

Claims (31)

1. a smelting iron and steel slagging method, it is characterized in that, before molten iron is blended into steel melting furnace, utilize described molten iron to use slag making materials to carry out slag making when molten iron is transferred to and contained molten iron container, described slag making materials is the mixture comprising CaO and ferrous material, and its chemical composition is: TFe 38.0% ~ 47.5%, CaO 19.0% ~ 32.0% in ferrous material, surplus is other moiety and inevitable impurity, and in CaO and ferrous material, the mass ratio of iron is 1:(1.2 ~ 2.5).
2. smelting iron and steel slagging method according to claim 1, is characterized in that, the temperature range of the described molten iron that slag making utilizes is 1230 DEG C ~ 1550 DEG C.
3. smelting iron and steel slagging method according to claim 1, is characterized in that, the temperature range of the described molten iron that slag making utilizes is 1380 DEG C ~ 1550 DEG C.
4. smelting iron and steel slagging method according to claim 1, is characterized in that, the temperature range of the described molten iron that slag making utilizes is 1430 DEG C ~ 1550 DEG C.
5. the smelting iron and steel slagging method according to any one of aforementioned claim 1-4, is characterized in that, described Sheng molten iron container is: general tank, and ironworks is by iron flask, and iron flask is converted by steel mill, fish torpedo ladle, one or more in hot metal mixer.
6. the smelting iron and steel slagging method according to any one of aforementioned claim 1-4, is characterized in that, described steel melting furnace is converter or electric furnace.
7. smelting iron and steel slagging method according to claim 5, is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into general tank.
8. smelting iron and steel slagging method according to claim 5, is characterized in that, described slag making is undertaken by during iron flask the molten iron flowed out by iron-smelting furnace is directly blended into ironworks.
9. smelting iron and steel slagging method according to claim 5, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by iron flask by ironworks by molten iron.
10. smelting iron and steel slagging method according to claim 5, is characterized in that, described slag making is undertaken by during iron flask and being transferred to when iron flask is converted by steel mill by iron flask by ironworks by molten iron the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
11. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making is carried out when molten iron is transferred to hot metal mixer by ironworks by iron flask.
12. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron.
13. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making is undertaken by during iron flask and when molten iron is transferred to hot metal mixer by ironworks by iron flask the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
14. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making is carried out when molten iron is transferred to hot metal mixer by ironworks by iron flask and being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron.
15. smelting iron and steel slagging methods according to claim 5, it is characterized in that, described slag making is undertaken by during iron flask and when molten iron is transferred to hot metal mixer by ironworks by iron flask and being transferred to when iron flask is converted by steel mill by hot metal mixer by molten iron the molten iron flowed out by iron-smelting furnace being directly blended into ironworks.
16. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into fish torpedo ladle.
17. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making is carried out being transferred to when iron flask is converted by steel mill by fish torpedo ladle by molten iron.
18. smelting iron and steel slagging methods according to claim 5, is characterized in that, described slag making carries out when the molten iron flowed out by iron-smelting furnace being directly blended into fish torpedo ladle and being transferred to when iron flask is converted by steel mill by fish torpedo ladle by molten iron.
19. smelting iron and steel slagging methods according to any one of aforementioned claim 8-18, it is characterized in that, before the described Sheng molten iron container of pending slag making transferred to by molten iron, be that the slag making materials that will add in this Sheng molten iron container of 5% ~ 30% joins in the described Sheng molten iron container of pending slag making in advance by mass percent.
20. 1 kinds of iron and steel smelting process, described iron and steel smelting process comprises:
Before molten iron is blended into steel melting furnace, the smelting iron and steel slagging method according to any one of claim 1-19 is adopted to utilize described molten iron slag making when molten iron is transferred to and contained molten iron container; And the molten iron through slag making is blended into steel melting furnace makes steel.
21. 1 kinds according to the slag making materials used in method in any one of the preceding claims wherein.
22. slag making materialses according to claim 21, it is characterized in that, the chemical composition of described slag making materials is: TFe 41.4% ~ 46.7% in ferrous material, CaO 20.3% ~ 27.6%, surplus is other moiety and inevitable impurity, and in CaO and ferrous material, the mass ratio of iron is 1:(1.5 ~ 2.3).
23. slag making materialses according to claim 21, it is characterized in that, the chemical composition of described slag making materials is: TFe 43.7% ~ 45.8% in ferrous material, CaO 21.7% ~ 24.3%, surplus is other moiety and inevitable impurity, and in CaO and ferrous material, the mass ratio of iron is 1:(1.8 ~ 2.1).
24. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, described ferrous material is mainly Fe 2o 3, FeO, Fe 3o 4, FeCO 3, CaOFe 2o 3, 2CaOFe 2o 3in one or more.
25. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, other moiety described comprises MgO, K 2o, Na 2o, CaF 2in one or more, the mass percent that the chemical composition of above each material accounts for slag making materials is respectively:
MgO≤12%, K 2o≤5%, Na 2o≤10%, CaF 2≤ 10%, wherein K 2o, Na 2o adds with the form of respective carbonate.
26. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, other moiety described comprises MgO, K 2o, Na 2o, CaF 2in one or more, the mass percent that the chemical composition of above each material accounts for slag making materials is respectively:
MgO≤8%, K 2o≤2%, Na 2o≤7%, CaF 2≤ 7%, wherein K 2o, Na 2o adds with the form of respective carbonate.
27. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, other moiety described comprises MgO, K 2o, Na 2o, CaF 2in one or more, the mass percent that the chemical composition of above each material accounts for slag making materials is respectively:
MgO≤6%, K 2o≤1%, Na 2o≤5%, CaF 2≤ 5%, wherein K 2o, Na 2o adds with the form of respective carbonate.
28. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: the scope of the particle adopting granulation or briquetting apparatus to make the powder of mixing or the largest contours size of briquetting is 2mm ~ 60mm;
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, is less than 5% to make slag material finished product water content.
29. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: adopt granulation or briquetting apparatus to make particle or briquetting the powder of mixing; The scope of the largest contours size of the particle that granulation obtains is 8mm ~ 20mm; The scope of the largest contours size of the block material that briquetting obtains is 25mm ~ 45mm;
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, is less than 5% to make slag material finished product water content.
30. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: by powder process mixing or the mixing powder process respectively of the slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: adopt granulation or briquetting apparatus to make particle or briquetting the powder of mixing; Scope 10mm ~ the 15mm of the largest contours size of the particle that granulation obtains; The scope of the largest contours size of the block material that briquetting obtains is 30mm ~ 35mm;
Dry materials: carry out natural air drying to Manufactured particle or lumpy material or use equipment gives drying, is less than 5% to make slag material finished product water content.
31. slag making materialses according to any one of aforementioned claim 21-23, it is characterized in that, the total add-on of described slag making materials in the method such as according to any one of claim 1-18 is 5kg/t iron~ 40kg/t iron.
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