CN102943146A - Steel smelting slagging method, steel smelting method and slagging material - Google Patents

Steel smelting slagging method, steel smelting method and slagging material Download PDF

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CN102943146A
CN102943146A CN201210422685XA CN201210422685A CN102943146A CN 102943146 A CN102943146 A CN 102943146A CN 201210422685X A CN201210422685X A CN 201210422685XA CN 201210422685 A CN201210422685 A CN 201210422685A CN 102943146 A CN102943146 A CN 102943146A
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iron
steel
molten iron
slag making
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CN102943146B (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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Abstract

The invention relates to a steel smelting slagging method, comprising the following steps: before adding molten iron into a steel furnace, using the molten iron for slagging when the molten iron is transferred to a container for retaining molten iron. The invention further relates to a steel smelting method comprising the steel smelting slagging method and a novel slagging material. According to the invention, slag with low melting point and good fluidity can be produced, the dephosphorization efficiency is raised; the slagging material has high utilization rate, thus the consumption of slagging lime is reduced; a large amount of iron-containing waste of steel making are effectively utilized, thus the consumption of steel materials is reduced; the smelting time is significantly shortened, and the oxygen consumption is reduced.

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 of iron and steel smelting process and a kind of novel slag making materials that comprises described smelting iron and steel slagging method.
Background technology
Converter steel making method is by being blended in the backward stove of converter oxygen blast and finishing blast-melted.By oxygen blast the carbon in the molten iron, silicon, manganese, phosphorus, sulphur etc. are adjusted in the scope that smelting technology requires.Reaching above-mentioned target must 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; slag making materials is added in the stove again, also have indivedual producers for protection furnace lining impact zone part lime to be added before molten iron is blended into converter in the stove, there is slag making hysteresis problem in this traditional technology.Slag making materials generally comprises lime, light dolomite etc.Because the slag making materials fusing point is higher, and often be 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 needs 2min ~ 5min), can only rely on a large amount of ferric oxide enter after the slag could with the low-melting compound of its generation, bath temperature raises after slag fusing, has missed best low temperature dephosphorization opportunity.Be the 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 additive such as calcium ferrite all needs the fusing that heats up, and still needs time of growing, has missed equally the best moment of low temperature dephosphorization.In addition, the calcium ferrite cost is higher, has restricted its usage quantity.In the converter steelmaking slagging process, because it is larger to add the lumpiness of slag charge, various compositions merge difficulty mutually when changing slag, the specific surface area that contacts with each other is less, and mutually infiltrating time is longer, often enters the carbon period slag making still undesirable, the splash phenomenon can appear, not only waste a large amount of starting material, also easily bring security incident to smelting operation, aggravated simultaneously the damage of equipment.
At present, each Iron And Steel Company's blast furnace casting temperature and is blended into molten iron temperature in the converter about 1300 ℃ generally about 1480 ℃, is to reduce the molten iron heat loss, usually adopts carbonization rice husk, Power Plant Ash etc. as heat preserving agent.These materials are low basicity material, can strengthen the burden that high basicity slag is made in the later stage converter, increase lime consumption, consume simultaneously amount of heat.
A lot of Electric furnace steel making manufacturing enterprises for shortening the heat, reduce energy consumption, also adopt molten iron to replace part steel scrap or the pig iron, therefore also face 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 carry out before molten iron is blended into steel melting furnace.
The principle of smelting iron and steel of the present invention and slagging method is to add slag making materials with several different methods to containing in the molten iron container when molten iron shifts, utilize physical thermal, chemical heat and the impact stirring action of molten iron to make slag making materials preheating or fusing, carry out pre-slag making, provide the initial stage that is beneficial to steel melting furnace dephosphorization slag.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 that includes but not limited to following four kinds of possible routes (a-d):
(a) iron-smelting furnace → general tank → steel melting furnace of ironworks steel mill;
(b) iron-smelting furnace → ironworks is subjected to iron flask → steel mill to convert iron flask → steel melting furnace;
(c) iron-smelting furnace → ironworks is subjected to iron flask → hot metal mixer → steel mill to convert iron flask → steel melting furnace;
(d) iron flask → steel melting furnace is converted by iron-smelting furnace → fish torpedo ladle → steel mill;
In above-mentioned molten iron transfer process, add slag making materials to containing in the molten iron container.Above-mentioned molten iron transfer process can be to contain the molten iron container by iron-smelting furnace to one to shift, and also can be to contain the 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 the ironworks is subjected to iron flask (abbreviation is subjected to iron flask), and iron flask (iron flask converted in abbreviation), fish torpedo ladle, one or more in the hot metal mixer are converted by steel mill.
For the present invention, more employed terms are defined as follows among the application:
" pre-slag making " or " slag making " refer to that adding slag making materials before molten iron is blended into steel melting furnace when molten iron is transferred to Sheng molten iron container utilizes described molten iron to carry out the technique of slag making.
" ferrous material " refers to mainly by Fe 2O 3, FeO, Fe 3O 4, FeCO 3, CaOFe 2O 3, 2CaOFe 2O 3In one or more materials that are mixed to get.
TFe refers to that the described ferrous material of patent of the present invention is through the total content (representing with massfraction) of 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 of three directions, i.e. that long, the widest, the highest size.
" total add-on of slag making materials " refers to the quality of the slag making materials that adds that obtains through conversion in ton iron, unit is " kg/t Iron".
" general tank is subjected to iron 1/4 ~ 3/4 process " refer to take shifted to general tank the molten iron total amount 1/4 as the time Fixed Initial Point and to have shifted the 3/4 molten iron transfer process of implementing to general tank that limits as the time end point of molten iron total amount to general tank.
" ironworks is subjected to iron flask to be subjected to iron 1/4 ~ 3/4 process " refer to take be subjected to the ironworks iron flask shifted the molten iron total amount 1/4 as the time Fixed Initial Point and to be subjected to iron flask to shift the 3/4 molten iron transfer process that implemented by iron flask that limits as the time end point of molten iron total amount to the ironworks.
" steel mill converts iron flask and is subjected to iron 1/4 ~ 3/4 process " refers to shift 1/4 of molten iron total amount and shifted 3/4 of molten iron total amount and convert the molten iron transfer process that iron flask is implemented as what the time end point limited to steel mill as the time Fixed Initial Point and to convert iron flask to steel mill to convert iron flask to steel mill.
Particularly, 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 Sheng molten iron container.
2. according to aspect 1 described smelting iron and steel slagging method, it is characterized in that, the temperature range of the described molten iron that slag making utilizes is 1200 ℃ ~ 1550 ℃; Preferably, the temperature range of described molten iron is 1380 ℃ ~ 1550 ℃; Preferred, the temperature range of described molten iron is 1430 ℃ ~ 1550 ℃.
3. according to aspect 1 or 2 described smelting iron and steel slagging methods, it is characterized in that, described Sheng molten iron container is: general tank, and the ironworks is subjected to iron flask, and iron flask is converted by steel mill, fish torpedo ladle, one or more in the hot metal mixer.
4. according to aspect 1 or 2 described smelting iron and steel slagging methods, it is characterized in that, described steel melting furnace is converter or electric furnace.
5. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out in the time will directly being blended into general tank by the molten iron that iron-smelting furnace flows out.
6. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out when the ironworks is subjected to iron flask will directly being blended into by the molten iron that iron-smelting furnace flows out.
7. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is carried out when molten iron is subjected to iron flask to transfer to steel mill to convert iron flask by the ironworks.
8. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out in the time will directly being blended into the ironworks by the molten iron that iron-smelting furnace flows out and being subjected to iron flask and when molten iron is subjected to iron flask to transfer to steel mill to convert iron flask by the ironworks.
9. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is carried out when being subjected to iron flask to transfer to hot metal mixer by the ironworks molten iron.
10. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is carried out when molten iron is transferred to steel mill and converted iron flask by hot metal mixer.
11. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is in the time will directly being blended into the ironworks by the molten iron that iron-smelting furnace flows out and being subjected to iron flask and carries out when being subjected to iron flask to transfer to hot metal mixer by the ironworks molten iron.
12. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is carried out when being subjected to iron flask to transfer to hot metal mixer by the ironworks molten iron and when molten iron is transferred to steel mill and converted iron flask by hot metal mixer.
13. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out in the time will directly being blended into the ironworks by the molten iron that iron-smelting furnace flows out and being subjected to iron flask and when being subjected to iron flask to transfer to hot metal mixer by the ironworks molten iron and when molten iron is transferred to steel mill and converted iron flask by hot metal mixer.
14. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out in the time will directly being blended into fish torpedo ladle by the molten iron that iron-smelting furnace flows out.
15. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is carried out when molten iron is transferred to steel mill and converted iron flask by fish torpedo ladle.
16. according to aspect 3 described smelting iron and steel slagging methods, it is characterized in that, described slag making is to carry out in the time will directly being blended into fish torpedo ladle by the molten iron that iron-smelting furnace flows out and when molten iron is transferred to steel mill and converted iron flask by fish torpedo ladle.
17. according to each described smelting iron and steel slagging method among the aforementioned aspect 6-16, it is characterized in that, before molten iron is transferred to the described Sheng molten iron container of pending slag making, be 5% ~ 30% will contain in the described Sheng molten iron container that the slag making materials that adds in the molten iron container joins pending slag making to this in advance with mass percent.
18. an iron and steel smelting process, described iron and steel smelting process comprises:
Before molten iron is blended into steel melting furnace, adopts according to each described smelting iron and steel slagging method among the aspect 1-17 and when molten iron is transferred to Sheng molten iron container, utilize described molten iron slag making; And will be blended into steel melting furnace through the molten iron of slag making and make steel.
19. slag making materials that in according to each described method in aspect aforementioned, uses, it is characterized in that, described slag making materials is the mixture that comprises CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in the 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%, and surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and the ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
20. according to aspect 19 described slag making materialses, 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. according to aspect 19 or 20 described slag making materialses, it is characterized in that, described other moiety comprises MgO, K 2O, Na 2O, CaF 2In one or more, the mass percent that the chemical composition of above each material accounts for respectively slag making materials is:
MgO≤12%, preferable range are≤8%, and more preferably scope is≤6%, K 2O≤5%, preferable range are≤2%, and more preferably scope is≤1%, Na 2O≤10%, preferable range are≤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 is with the separately form adding of carbonate.
22. according to each described slag making materials among the aforementioned aspect 19-21, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: with respectively powder process mixing or the mixing powder process of slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: it is 2mm ~ 60mm that the powder of mixing is adopted the scope of the largest contours size of particle that granulation or briquetting apparatus make or briquetting; The preferable range of the largest contours size of the resulting particle of granulation is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of resulting block of material of briquetting is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm;
Dry materials: to Manufactured particle or lumpy material carries out natural air drying or use equipment gives drying, so that slag material finished product water content is less than 5%.
23. according to each described slag making materials among the aforementioned aspect 19-22, it is characterized in that, described slag making materials as aspect among the 1-16 the total add-on in each described method be 5kg/t Iron~ 40kg/t Iron
24. slag making materials, it is characterized in that, described slag making materials is the mixture that comprises CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in the 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%, and surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and the ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
25. according to aspect 24 described slag making materialses, 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. according to aspect 24 or 25 described slag making materialses, it is characterized in that, described other moiety comprises MgO, K 2O, Na 2O, CaF 2In one or more, the mass percent that the chemical composition of above each material accounts for respectively slag making materials is:
MgO≤12%, preferable range are≤8%, and more preferably scope is≤6%, K 2O≤5%, preferable range are≤2%, and more preferably scope is≤1%, Na 2O≤10%, preferable range are≤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 is with the separately form adding of carbonate.
27. according to each described slag making materials among the aforementioned aspect 24-26, it is characterized in that, the preparation method of described slag making materials is:
Powder process and mixing: with respectively powder process mixing or the mixing powder process of slag making materials of above-mentioned chemical composition, particle diameter is less than or equal to 5mm;
Granulation or briquetting: it is 2mm ~ 60mm that the powder of mixing is adopted the scope of the largest contours size of particle that granulation or briquetting apparatus make or piece material; The preferable range of the largest contours size of the resulting particle of granulation is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of resulting block of material of briquetting is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm;
Dry materials: to Manufactured particle or lumpy material carries out natural air drying or use equipment gives drying, so that slag material finished product water content is less than 5%.
28. according to each described slag making materials among the 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 efficient, reduces iron loss, and is significant for the producer that smelts high phosphorus hot metal.
(2) owing to having reduced the fusing point of slag, improved the effective CaO in the slag, both improved the activity of CaO, the slag making materials utilization ratio is high, has reduced the consumption of slag lime.
(3) slag making materials of the present invention can utilize the ferrous materials 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 and dull ore deposit are utilized effectively, and has reduced the consumption of iron and steel stock.
(4) adopt slag making materials of the present invention to have heat insulation function, replace existing technique and contain the lagging material on molten iron container top.
(5) because pre-slag making makes steel melting furnace rapid slagging in early stage, reduce oxygen depletion, shortened 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 invention.
Embodiment
Below in conjunction with Figure of description the specific embodiment of the present invention is elaborated, but it is pointed out that protection scope of the present invention is not subjected to 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 is the part slag making of steel melting furnace and smelting task to be moved forward to carry out before molten iron is blended into steel melting furnace.
Below the concrete steps of this steelmaking slagging technique are described:
(1) preparation slag making materials
Adopt following method to prepare the employed slag making materials of slagging process of the present invention:
Powder process and mixing: with respectively powder process mixing or the mixing powder process of slag making materials of mentioned component, particle diameter is less than or equal to 5mm; After above-mentioned powder fully mixes, can increase the specific surface area that various materials are in contact with one another, improve mass transfer condition, thereby shorten the fusing time of slag charge.Existing smelting slag making technique is that the block material with one matter joins in the stove, because the material lumpiness is larger, the reaction mass transfer condition is relatively poor, and the fusing slag making time is long.
Granulation or briquetting: it is 2mm ~ 60mm that the powder of mixing is adopted the scope of the largest contours size of particle that granulation or briquetting apparatus make or piece material; The preferable range of the largest contours size of the resulting particle of granulation is 8mm ~ 20mm, more preferably scope 10mm ~ 15mm; The preferable range of the largest contours size of resulting block of material of briquetting is 25mm ~ 45mm, and more preferably scope is 30mm ~ 35mm.The largest contours size is too little, easily forms dust, and wettability is relatively poor; The largest contours size is too large, and melting heat transfer is bad.The piece material is too little when adopting the briquetting apparatus briquetting, and production efficiency is too low, is unfavorable for producing.Employed term " largest contours size " refers to the overall dimension of particle or block material profile in this application, is generally the size of three directions, i.e. that long, the widest, the highest size.
Dry materials: to Manufactured particle or lumpy material carries out natural air drying or use equipment gives drying, require slag making materials finished product water content less than 5%.
Made slag making materials is the mixture that comprises 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%, and 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 the ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
Described other moiety can comprise MgO, K 2O, Na 2O, CaF 2In one or more, wherein the chemical composition of each material according to the ratio that mass percent accounts for respectively slag making materials is: MgO≤12%, preferable range are≤8%, more preferably scope is≤6%, K 2O≤5%, preferable range are≤2%, and more preferably scope is≤1%, Na 2O≤10%, preferable range are≤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 is with the separately form adding of carbonate.
Slag making materials of the present invention can further comprise compounds such as containing potassium, sodium, calcium, magnesium, thereby further reduce the slag charge fusing point, slag making materials of the present invention can also comprise well known in the art other can fall low-melting compound, such as the compound of boron, barium etc.It is lower that the slag charge fusing point is joined by institute, and the slag making materials that can melt under the same conditions is just more.
(2) adding of slag making materials
Be blended into the steel melting furnace forward direction at molten iron and contain adding 5 kg/t in the molten iron container Iron~ 40kg/t IronThe slag making materials for preparing.Certainly, the those skilled in the art also can recognize: although be not preferably, also can use the larger slag making materials slag making of lumpiness of prior art in slagging process of the present invention.The temperature range of the described molten iron that slag making of the present invention utilizes is 1200 ℃ ~ 1550 ℃; Preferably, the temperature range of described molten iron is 1380 ℃ ~ 1550 ℃; Preferred, the temperature range of described molten iron is 1430 ℃ ~ 1550 ℃.In the said temperature scope, the temperature of described molten iron is higher, more is 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 the ironworks is subjected to iron flask (abbreviation is subjected to iron flask), and iron flask (iron flask converted in abbreviation), fish torpedo ladle, one or more in the hot metal mixer are converted by steel mill.The those skilled in the art can recognize: can access in the insulation of containing the molten iron container under the prerequisite that ensures well, improve as much as possible heat utilization efficiency, simultaneously by controlling the composition proportion of each material in the slag charge, obtain the lower slag charge of fusing point, the add-on of slag making materials can be greater than 40kg/t in these cases Iron
The principle that the present invention adds the slag making materials method is to add slag material with several different methods in containing the molten iron container when molten iron shifts, utilize physical thermal, chemical heat and the impact stirring action of molten iron to make slag making materials preheating or fusing, carry out pre-slag making, provide the initial stage that is beneficial to steel melting furnace dephosphorization slag.
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 invention.The concrete technology route of steelmaking slagging technique of the present invention can be:
(a) in the time will directly transferring to general tank by the molten iron that iron-smelting furnace flows out, add the above-mentioned slag making materials for preparing;
(b) make the molten iron that is flowed out by iron-smelting furnace at first transfer to the ironworks and be subjected to iron flask, be subjected to iron flask to transfer to steel mill by the ironworks again and convert in the iron flask, the molten iron of finishing pre-slag making task is added in the steel melting furnace make steel.Add the above-mentioned slag making materials for preparing in the time of in this process, can being chosen in molten iron and transferring to the ironworks and be subjected to iron flask, also can be chosen in and add the above-mentioned slag making materials for preparing when being subjected to iron flask to transfer to steel mill to convert iron flask by the ironworks, add the above-mentioned slag making materials for preparing of part (for example 20% ~ 50%) in the time of can also being chosen in molten iron and transferring to the ironworks and be subjected to iron flask, add simultaneously the above-mentioned slag making materials for preparing of remainder when being subjected to iron flask to transfer to steel mill to convert iron flask by the ironworks, the adding mode of above three kinds of slag making materialses can both satisfactorily be finished pre-slag making task;
(c) make the molten iron that is flowed out by iron-smelting furnace at first transfer to the ironworks and be subjected to iron flask, be subjected to iron flask to transfer to hot metal mixer by the ironworks again, be transferred to steel mill by hot metal mixer again and convert in the iron flask, the molten iron of finishing pre-slag making task is added in the steel melting furnace make steel.Add all above-mentioned slag making materialses that prepare in the time of in this process, can being chosen in molten iron and transferring to the ironworks and be subjected to iron flask; Also can be chosen in and add all above-mentioned slag making materialses that prepare when being subjected to iron flask to transfer to hot metal mixer by the ironworks; Also can be chosen in and add all above-mentioned slag making materialses that prepare when transferring to steel mill and convert iron flask by hot metal mixer; Add the above-mentioned slag making materials for preparing of part (for example 20% ~ 50%) in the time of can also being chosen in molten iron and transferring to the ironworks and be subjected to iron flask, when being subjected to iron flask to transfer to hot metal mixer by the ironworks, add simultaneously the above-mentioned slag making materials for preparing of remainder; Can also be chosen in the above-mentioned slag making materials for preparing that adds when molten iron is subjected to iron flask to transfer to hot metal mixer by the ironworks, when transferring to steel mill by hot metal mixer and convert iron flask, add simultaneously the above-mentioned slag making materials for preparing of remainder; Add the above-mentioned slag making materials for preparing of part (for example 20% ~ 50%) in the time of can also being chosen in molten iron and transferring to the ironworks and be subjected to iron flask, when transferring to steel mill by hot metal mixer and convert iron flask, add simultaneously the above-mentioned slag making materials for preparing of remainder; Add the above-mentioned slag making materials for preparing of part (for example 20% ~ 40%) in the time of can also being chosen in molten iron and transferring to the ironworks and be subjected to iron flask, simultaneously when being subjected to iron flask to transfer to hot metal mixer by the ironworks, add the above-mentioned slag making materials for preparing of part (for example 20% ~ 40%), when transferring to steel mill by hot metal mixer and convert iron flask, add simultaneously the above-mentioned slag making materials for preparing of remainder; The adding mode of above seven kinds of slag making materialses can both satisfactorily be finished pre-slag making task;
(d) make the molten iron that is flowed out by iron-smelting furnace at first transfer to fish torpedo ladle, transfer to steel mill by fish torpedo ladle again and convert iron flask, the molten iron of finishing pre-slag making task is added in the steel melting furnace make steel.Add all above-mentioned slag making materialses that prepare in the time of in this process, can being chosen in molten iron and transferring to fish torpedo ladle; Also can be chosen in and add all above-mentioned slag making materialses that prepare when transferring to steel mill and convert iron flask by fish torpedo ladle; Add the above-mentioned slag making materials for preparing of part (for example 20% ~ 50%) in the time of can also being chosen in molten iron and transferring to fish torpedo ladle, when transferring to steel mill by fish torpedo ladle and convert iron flask, add simultaneously the above-mentioned slag making materials for preparing of remainder; The adding mode of above three kinds of slag making materialses can both satisfactorily be finished pre-slag making task.
In each concrete technology route of steelmaking slagging technique of the present invention in above (a)-(d), can also be before a certain Sheng molten iron container of the pending slag making that molten iron is transferred to, can in advance part will be contained the slag making materials that adds (preferred 5% ~ 30%) in the molten iron container to this and join in this Sheng molten iron container, above related per-cent data are the quality percentage composition.
The present invention has also disclosed a kind of iron and steel smelting process that comprises above-mentioned brand-new steelmaking slagging technique.Described iron and steel smelting process may further comprise the steps: smelt iron in iron-smelting furnace; In the time will transferring to Sheng molten iron container from the molten iron of iron-smelting furnace, utilize described molten iron slag making; To be blended into steel melting furnace through the described molten iron of slag making makes 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 efficient, can improve 3.0% ~ 18.4%, significantly reduces iron loss, and is significant for the producer that smelts high phosphorus hot metal.
2. owing to having reduced the fusing point of slag, improved the effective CaO in the slag, both improved the activity of CaO, the slag making materials utilization ratio is high, has reduced 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 materials 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, and has reduced the consumption of iron and steel stock, and the reduction 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 existing technique and contain the lagging material on molten iron container top.
5. owing to pre-slag making, make the rapid slagging in early stage of steel melting furnace, reduced significantly converter smelting time, oxygen supply time, the oxygen supply time of minimizing can reach 8s ~ 103s, has reduced oxygen depletion.The electric furnace hot-mounting process has also been shortened tap to tap time, and 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 following these embodiment.
Listed in embodiments of the present invention employed slag making materials parameter table look-up (the per-cent data in this table are the quality percentage composition) in the following table 1.
Table 1
Figure 201210422685X100002DEST_PATH_IMAGE001
The molten iron temperature that the molten iron temperature of mentioning in following each embodiment bracket obtains for actual measurement in the equipment before bracket, for example: 1470 ℃ is the molten iron temperature in the iron-smelting furnace among the embodiment 1.
Embodiment 1
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 110.75t, adding amount of scrap steel: 23.75t, tap: 125t.
Requirement according to this factory's blast furnace casting temperature (1470 ℃) and process for making, with the material of material number 2 according to operational path iron-smelting furnace (molten iron temperature: 1470 ℃) → general tank of ironworks steel mill (molten iron temperature: 1340 ℃) → steel melting furnace, disposable input 100kg slag charge at the bottom of general tank is subjected to iron forward universal tank tank, all the other 454 kg slag charges are subjected to add continuously in the iron process at general tank.
Test-results is as shown in table 2:
Figure 383648DEST_PATH_IMAGE002
Can be seen by the test-results shown in the table 2, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 9s; The lime consumption amount has reduced 2.1kg/t SteelDephosphorization efficient improves 4.8%; The iron and steel stock consumption reduces 2.6kg/t Steel
Embodiment 2
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 160.38t, adding amount of scrap steel: 40.4t, tap: 188t.
Requirement according to this factory's blast furnace casting temperature (1530 ℃) and process for making, the material of material number 1 according to operational path iron-smelting furnace (molten iron temperature: 1530 ℃) → general tank of ironworks steel mill (molten iron temperature: 1340 ℃) → steel melting furnace, is subjected to drop into continuously in iron 1/4 ~ 3/4 process 6351kg slag charge at general tank.
Test-results is as shown in table 3:
Figure 201210422685X100002DEST_PATH_IMAGE003
Can be seen by the test-results shown in the table 3, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 81s; Lime consumption has reduced 11.2kg/t SteelDephosphorization efficient improves 10.2%; Iron and steel stock consumption reduces 24.8kg/t Steel
Embodiment 3
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 90.25t, adding amount of scrap steel: 15.2t, tap: 95t.
Requirement according to this factory's blast furnace casting temperature (1508 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1410 ℃) → hot metal mixer → steel mill to convert iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1508 ℃) → ironworks the material of material number 6, be subjected to iron flask to be subjected to drop into continuously in iron 1/4 ~ 3/4 process 1444 kg slag charges in the ironworks.
Test-results is as shown in table 4:
Can be seen by the test-results shown in the table 4, adopt processing method of the present invention can reach following beneficial effect (the existing technique identical with the steel-making task is compared):
Oxygen supply time shortens 51s; Lime consumption has reduced 6.0kg/t SteelDephosphorization efficient improves 8.1%; Iron and steel stock consumption reduces 9.7kg/t Steel
Embodiment 4
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 157.5t, adding amount of scrap steel: 36.9t, tap: 180t.
Requirement according to this factory's blast furnace casting temperature (1520 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1415 ℃) → hot metal mixer → steel mill to convert iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1520 ℃) → ironworks the material of material number 7, add 945kg before the ironworks is subjected to iron flask to be subjected to iron, all the other 2362kg slag charges are subjected to iron flask to be subjected to add continuously in the iron process in the ironworks.
Test-results is as shown in table 5:
Can be seen by the test-results shown in the table 5, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 48s; Lime consumption has reduced 6.1kg/t SteelDephosphorization efficient improves 9.0%; Iron and steel stock consumption reduces 13.4kg/t Steel
Embodiment 5
Use the method test in 250 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 219.33t, adding amount of scrap steel: 51.87t, tap: 247t.
Requirement according to this factory's blast furnace casting temperature (1505 ℃) and process for making, be subjected to iron flask → hot metal mixer (molten iron temperature: 1420 ℃) → steel mill to convert iron flask (molten iron temperature: 1300 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1505 ℃) → ironworks the material of material number 9, convert in steel mill and to add 1100kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 3725kg.
Test-results is as shown in table 6:
Figure 142843DEST_PATH_IMAGE006
Can be seen by the test-results shown in the table 6, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 52s; Lime consumption has reduced 8.1kg/t SteelDephosphorization efficient improves 8.9%; Iron and steel stock consumption reduces 12.5kg/t Steel
Embodiment 6
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 107.0 tons, adding amount of scrap steel: 25.75t, tap: 125t.
Requirement according to this factory's blast furnace casting temperature (1530 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1470 ℃) → hot metal mixer (molten iron temperature: 1445 ℃) → steel mill to convert iron flask (molten iron temperature: 1370 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1530 ℃) → ironworks the material of material number 10, before being subjected to iron flask to be subjected to iron, the ironworks adds 500kg, be subjected to iron flask to be subjected to add continuously in the iron process 1175kg in the ironworks, steel mill converts iron flask and is subjected to add continuously in the iron process 1000kg.
Test-results is as shown in table 7:
Figure 201210422685X100002DEST_PATH_IMAGE007
Can be seen by the test-results shown in the table 7, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 44s; Lime consumption has reduced 11.0kg/t SteelDephosphorization efficient carries 14.0%; Iron and steel stock consumption reduces 15.3kg/t Steel
Embodiment 7
Use the method test in 80 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 75.735t, adding amount of scrap steel: 15.3t, tap: 85t.
Requirement according to this factory's blast furnace casting temperature (1505 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1465 ℃) → hot metal mixer (molten iron temperature: 1440 ℃) → steel mill to convert iron flask (molten iron temperature: 1380 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1505 ℃) → ironworks the material of material number 8, be subjected to iron flask to be subjected to add continuously in the iron process 800kg in the ironworks, steel mill converts iron flask and is subjected to add 140kg before the iron, and steel mill converts iron flask and is subjected to add continuously in the iron process 423kg.
Test-results is as shown in table 8:
Figure 351101DEST_PATH_IMAGE008
Can be seen by the test-results shown in the table 8, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 34s; Lime consumption has reduced 6.2kg/t SteelDephosphorization efficient improves 9.6%; Iron and steel stock consumption reduces 10.7kg/t Steel
Embodiment 8
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 97.125t, adding amount of scrap steel: 19.425t, tap: 105t.
Requirement according to this factory's blast furnace casting temperature (1500 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1445 ℃) → hot metal mixer (molten iron temperature: 1410 ℃) → steel mill to convert iron flask (molten iron temperature: 1330 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1500 ℃) → ironworks the material of material number 10, before being subjected to iron flask to be subjected to iron, the ironworks adds 500kg, be subjected to iron flask to be subjected to add continuously in the iron process 1000kg in the ironworks, steel mill converts iron flask and is subjected to add 200kg before the iron, and steel mill converts iron flask and is subjected to add continuously in the iron process 728kg.
Test-results is as shown in table 9:
Figure 201210422685X100002DEST_PATH_IMAGE009
Can be seen by the test-results shown in the table 9, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 45s; Lime consumption has reduced 35.1kg/t SteelDephosphorization efficient improves 9.5%; Iron and steel stock consumption reduces 15.3kg/t Steel
Embodiment 9
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 110.0t, adding amount of scrap steel: 22.5t, tap: 125t.
Requirement according to this factory's blast furnace casting temperature (1495 ℃) and process for making, be subjected to iron flask → hot metal mixer (molten iron temperature: 1410 ℃) → steel mill to convert iron flask (molten iron temperature: 1320 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1495 ℃) → ironworks the material of material number 3, convert iron flask in steel mill and be subjected to drop into continuously in iron 1/4 ~ 3/4 process 550kg.
Test-results is as shown in table 10:
Can be seen by the test-results shown in the table 10, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 11s; Lime consumption has reduced 1.3kg/t SteelDephosphorization efficient improves 3.0%; Iron and steel stock consumption reduces 3.3kg/t Steel
Embodiment 10
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 157.5t, adding amount of scrap steel: 36.0t, tap: 180t.
Requirement according to this factory's blast furnace casting temperature (1478 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1420 ℃) → hot metal mixer (molten iron temperature: 1400 ℃) → steel mill to convert iron flask (molten iron temperature: 1330 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1478 ℃) → ironworks the material of material number 4, be subjected to iron flask to be subjected to add continuously in the iron process 700kg in the ironworks, convert iron flask in steel mill and be subjected to add continuously in the iron process 560kg.
Test-results is as shown in table 11:
Figure 201210422685X100002DEST_PATH_IMAGE011
Can be seen by the test-results shown in the table 11, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 16s; Lime consumption has reduced 3.1kg/t SteelDephosphorization efficient improves 5.1%; Iron and steel stock consumption reduces 4.6kg/t Steel
Embodiment 11
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 150.304t, adding amount of scrap steel: 37.84t, tap: 176t.
Requirement according to this factory's blast furnace casting temperature (1490 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1430 ℃) → steel mill to convert iron flask (molten iron temperature: 1310 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1490 ℃) → ironworks the material of material number 5, be subjected to iron flask to be subjected to add continuously in the iron process 1450kg in the ironworks, convert iron flask in steel mill and be subjected to add continuously in the iron process 805kg.
Test-results is as shown in table 12:
Figure 367697DEST_PATH_IMAGE012
Can be seen by the test-results shown in the table 12, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 33s; Lime consumption has reduced 4.1kg/t SteelDephosphorization efficient improves 9.6%; Iron and steel stock consumption reduces 9.8kg/t Steel
Embodiment 12
Use the method test in 250 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 222.0t, adding amount of scrap steel: 52.5t, tap: 250t.
Requirement according to this factory's blast furnace casting temperature (1550 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1400 ℃) → steel mill to convert iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1550 ℃) → ironworks the material of material number 1, be subjected to iron flask to be subjected to add continuously in the iron process 8791kg in the ironworks.
Test-results is as shown in table 13:
Can be seen by the test-results shown in the table 13, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 103s; Lime consumption has reduced 11.4kg/t SteelDephosphorization efficient improves 9.2%; Iron and steel stock consumption reduces 24.8kg/t Steel
Embodiment 13
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 112.5t, adding amount of scrap steel: 21.25t, tap: 125t.
Requirement according to this factory's blast furnace casting temperature (1515 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1465 ℃) → steel mill to convert iron flask (molten iron temperature: 1360 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1515 ℃) → ironworks the material of material number 9, convert iron flask in steel mill and be subjected to add continuously in the iron process 2475kg.
The test-results that obtains is as shown in table 14:
Figure 634730DEST_PATH_IMAGE014
Can be seen by the test-results shown in the table 14, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 37s; Lime consumption has reduced 6.6kg/t SteelDephosphorization efficient improves 8.5%; Iron and steel stock consumption reduces 12.5kg/t Steel
Embodiment 14
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 94.76t, adding amount of scrap steel: 16.48t, tap: 103t.
Requirement according to this factory's blast furnace casting temperature (1472 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1420 ℃) → steel mill to convert iron flask (molten iron temperature: 1345 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1472 ℃) → ironworks the material of material number 2, convert in steel mill and to add 100kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 374kg.
Test-results is as shown in Table 15:
Figure 201210422685X100002DEST_PATH_IMAGE015
Can be seen by the test-results shown in the table 15, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 8s; Lime consumption has reduced 4.0kg/t SteelDephosphorization efficient improves 3.7%; Iron and steel stock consumption reduces 2.6kg/t Steel
Embodiment 15
Use the method test in 60 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 60.125t, adding amount of scrap steel: 9.1t, tap: 65t.
Requirement according to this factory's blast furnace casting temperature (1522 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1430 ℃) → steel mill to convert iron flask (molten iron temperature: 1320 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1522 ℃) → ironworks the material of material number 10, before being subjected to iron flask to be subjected to iron, the ironworks adds 200kg, be subjected to iron flask to be subjected to add continuously in the iron process 800kg in the ironworks, convert iron flask in steel mill and be subjected to add continuously in the iron process 503kg.
Test-results is shown in table 16:
Figure 895947DEST_PATH_IMAGE016
Can be seen by the test-results shown in the table 16, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 38 s; Lime consumption has reduced 10.5kg/t SteelDephosphorization efficient improves 18.4%; Iron and steel stock consumption reduces 15.3kg/t Steel
Embodiment 16
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 111.25t, adding amount of scrap steel: 22.5t, tap: 125t.
Requirement according to this factory's blast furnace casting temperature (1506 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1445 ℃) → steel mill to convert iron flask (molten iron temperature: 1325 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1506 ℃) → ironworks the material of material number 8, be subjected to iron flask to be subjected to add continuously in the iron process 1000kg in the ironworks, convert in steel mill and to add 160kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 843kg.
Test-results is shown in table 17:
Figure 201210422685X100002DEST_PATH_IMAGE017
Can be seen by the test-results shown in the table 17, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 34s; Lime consumption has reduced 8.8kg/t SteelDephosphorization efficient improves 12.0%; Iron and steel stock consumption reduces 10.7kg/t Steel
Embodiment 17
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 158.844t, adding amount of scrap steel: 36.6t, tap: 183t.
Requirement according to this factory's blast furnace casting temperature (1475 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1365 ℃) → steel mill to convert iron flask → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1475 ℃) → ironworks the material of material number 3, add 100kg before the ironworks is subjected to iron flask to be subjected to iron, all the other 694kg slag charges are subjected to iron flask to be subjected to add continuously in the iron process in the ironworks.
Test-results such as table 18 show:
Figure 377875DEST_PATH_IMAGE018
Can be seen by the test-results that table 18 shows, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 12s; Lime consumption has reduced 1.0kg/t SteelDephosphorization efficient improves 4.1%; Iron and steel stock consumption reduces 3.3kg/t Steel
Embodiment 18
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 99.54t, adding amount of scrap steel: 16.8t, tap: 105t.
Requirement according to this factory's blast furnace casting temperature (1498 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1413 ℃) → steel mill to convert iron flask (molten iron temperature: 1295 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1498 ℃) → ironworks the material of material number 6, before being subjected to iron flask to be subjected to iron, the ironworks adds 200kg, be subjected to iron flask to be subjected to add continuously in the iron process 840kg in the ironworks, convert in steel mill and to add 153kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 400kg.
Test-results such as table 19:
Figure 201210422685X100002DEST_PATH_IMAGE019
Can be seen by result shown in the table 19, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 47s; Lime consumption has reduced 10.9kg/t SteelDephosphorization efficient improves 7.5%; Iron and steel stock consumption reduces 9.7kg/t Steel
Embodiment 19
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 97.65t, adding amount of scrap steel: 16.8t, tap: 105t.
Requirement according to this factory's blast furnace casting temperature (1528 ℃) 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 ℃) → fish torpedo ladle (molten iron temperature: 1425 ℃) → steel mill, be subjected to add continuously in the iron process 2050kg at fish torpedo ladle.
Test-results is shown in table 20:
Figure 433556DEST_PATH_IMAGE020
Can be seen by the test-results shown in the table 20, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 66s; Lime consumption has reduced 14.6kg/t SteelDephosphorization efficient improves 8.5%; Iron and steel stock consumption reduces 13.4kg/t Steel
Embodiment 20
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q195, the molten iron amount of being blended into: 157.38t, adding amount of scrap steel: 34.77t, tap: 183t.
Requirement according to this factory's blast furnace casting temperature (1526 ℃) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1330 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1526 ℃) → fish torpedo ladle (molten iron temperature: 1440 ℃) → steel mill, be subjected to add continuously in the iron process 1800kg at fish torpedo ladle, convert iron flask in steel mill and be subjected to add continuously in the iron process 2134kg.
Test-results is shown in table 21:
Can be seen by the test-results shown in the table 21, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 56s; Lime consumption has reduced 9.8kg/t SteelDephosphorization efficient improves 12.8%; Iron and steel stock consumption reduces 15.3kg/t Steel
Embodiment 21
Use the method test in 250 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 222.0t, adding amount of scrap steel: 52.5t, tap: 250t.
Requirement according to this factory's blast furnace casting temperature (1485 ℃) and process for making, the material of material number 4 is converted iron flask (molten iron temperature: 1325 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1485 ℃) → fish torpedo ladle (molten iron temperature: 1421 ℃) → steel mill, convert in steel mill and to add 176kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 1600kg.
Test-results is shown in table 22:
Figure 499470DEST_PATH_IMAGE022
Can be seen by the test-results shown in the table 22, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 19s; Lime consumption has reduced 3.1kg/t SteelDephosphorization efficient improves 4.7%; Iron and steel stock consumption reduces 4.6kg/t Steel
Embodiment 22
Use the method test in 120 tons of converters of certain steel mill, produce steel grade: SPHC, the molten iron amount of being blended into: 105.48t, adding amount of scrap steel: 22.8t, tap: 120t.
Requirement according to this factory's blast furnace casting temperature (1516 ℃) and process for making, the material of material number 8 is converted iron flask (molten iron temperature: 1315 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1516 ℃) → fish torpedo ladle (molten iron temperature: 1442 ℃) → steel mill, before being subjected to iron, fish torpedo ladle adds 200kg, be subjected to add continuously in the iron process 938kg at fish torpedo ladle, convert iron flask in steel mill and be subjected to add continuously in the iron process 760kg.
Test-results is shown in table 23:
Figure 201210422685X100002DEST_PATH_IMAGE023
Can be seen by the test-results shown in the table 23, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 33s; Lime consumption has reduced 7.5kg/t SteelDephosphorization efficient improves 9.7%; Iron and steel stock consumption reduces 10.7kg/t Steel
Embodiment 23
Use the method test in 60 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 63.98t, adding amount of scrap steel: 10.5t, tap: 70t.
Requirement according to this factory's blast furnace casting temperature (1482 ℃) and process for making, the material of material number 3 is converted iron flask (molten iron temperature: 1340 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1482 ℃) → fish torpedo ladle (molten iron temperature: 1444 ℃) → steel mill, convert iron flask in steel mill and be subjected to add continuously in the iron process 320kg.
Test-results is shown in table 24:
Can be seen by the test-results shown in the table 24, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 9s; Lime consumption has reduced 1.4kg/t SteelDephosphorization efficient improves 4.5%; Iron and steel stock consumption reduces 3.3kg/t Steel
Embodiment 24
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 88.3t, adding amount of scrap steel: 18.5t, tap: 100t.
Requirement according to this factory's blast furnace casting temperature (1487 ℃) and process for making, the material of material number 5 is converted iron flask (molten iron temperature: 1300 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1487 ℃) → fish torpedo ladle (molten iron temperature: 1426 ℃) → steel mill, be subjected to add continuously in the iron process 525kg at fish torpedo ladle, convert in steel mill and to add 200kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 600kg.
Test-results is as shown in Table 25:
Figure 201210422685X100002DEST_PATH_IMAGE025
Can be seen by the test-results shown in the table 25, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 28s; Lime consumption has reduced 5.1kg/t SteelDephosphorization efficient improves 7.3%; Iron and steel stock consumption reduces 9.8kg/t Steel
Embodiment 25
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 159.66t, adding amount of scrap steel: 33.3t, tap: 180t.
Requirement according to this factory's blast furnace casting temperature (1517 ℃) and process for making, the material of material number 9 is converted iron flask (molten iron temperature: 1300 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1517 ℃) → fish torpedo ladle (molten iron temperature: 1427 ℃) → steel mill, before being subjected to iron, fish torpedo ladle adds 300kg, be subjected to add continuously in the iron process 1800kg at fish torpedo ladle, convert in steel mill and to add 153kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 1260kg.
Test-results is shown in table 26:
Figure 822184DEST_PATH_IMAGE026
Can be seen by the test-results shown in the table 26, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 46s; Lime consumption has reduced 6.3kg/t SteelDephosphorization efficient improves 9.5%; Iron and steel stock consumption reduces 12.5kg/t Steel
Embodiment 26
Use the method test in 100 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 95.4t, adding amount of scrap steel: 17.49t, tap: 106t.
Requirement according to this factory's blast furnace casting temperature (1516 ℃) 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 ℃) → fish torpedo ladle (molten iron temperature: 1407 ℃) → steel mill, before fish torpedo ladle is subjected to iron, add 385kg, be subjected to add continuously in the iron process 2000kg at fish torpedo ladle.
Test-results is shown in table 27:
Can be seen by the test-results shown in the table 27, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time contracting 48s; Lime consumption has reduced 8.5kg/t SteelDephosphorization efficient improves 11.2%; Iron and steel stock consumption reduces 15.3kg/t Steel
Embodiment 27
Use the method test at 100 tons of electric furnaces of certain steel mill, this factory adopts electric furnace hot-mounting process hot metal charging than 70%, and namely every stove is blended into 77 tons of molten iron, and the slag steel is blended into simultaneously, and all the other are steel scrap.Producing steel grade is bearing steel, tap 110t.
Requirement according to this factory's blast furnace casting temperature (1500 ℃) and process for making, the material of material number 10 is converted iron flask (molten iron temperature: 1316 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1500 ℃) → fish torpedo ladle (molten iron temperature: 1439 ℃) → steel mill, convert in steel mill and to add 450kg before iron flask is subjected to iron, convert iron flask in steel mill and be subjected to add continuously in the iron process 1475kg.
Test-results is shown in table 28:
Can be seen by the test-results shown in the table 28, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Shorten 121s tap to tap time; Lime consumption has reduced 5.5kg/t SteelDephosphorization efficient improves 9.8%; Iron and steel stock consumption reduces 10.7kg/t Steel
Embodiment 28
Use the method test at 100 tons of electric furnaces of certain steel mill, this factory adopts electric furnace hot-mounting process hot metal charging than 70%, and namely every stove is blended into 80.5 tons of molten iron, and the slag steel is blended into simultaneously, and all the other are steel scrap.Producing steel grade is bearing steel, 115 tons of taps.
Requirement according to this factory's blast furnace casting temperature (1476 ℃) and process for making, be subjected to iron flask → hot metal mixer (molten iron temperature: 1427 ℃) → steel mill to convert iron flask (molten iron temperature: 1362 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1476 ℃) → ironworks the material of material number 3, convert iron flask in steel mill and be subjected to add continuously in the iron process 403kg.
Test-results is shown in table 29:
Figure 201210422685X100002DEST_PATH_IMAGE029
Can be seen by the test-results shown in the table 29, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Shorten 51s tap to tap time; Lime consumption has reduced 1.2kg/t SteelDephosphorization efficient improves 4.7%; Iron and steel stock consumption reduces 4.6kg/t Steel
Embodiment 29
Use the method test in 180 tons of converters of certain steel mill, produce steel grade: Q235B, the molten iron amount of being blended into: 150.304t, adding amount of scrap steel: 37.84t, tap: 176t.
Requirement according to this factory's blast furnace casting temperature (1470 ℃) and process for making, be subjected to iron flask (molten iron temperature: 1230 ℃) → steel mill to convert iron flask (molten iron temperature: 1201 ℃) → steel melting furnace according to operational path iron-smelting furnace (molten iron temperature: 1470 ℃) → ironworks the material of material number 2, be subjected to iron flask to be subjected to add continuously in the iron process 526kg in the ironworks, convert iron flask in steel mill and be subjected to add continuously in the iron process 225kg.
Test-results is shown in table 30:
Figure 369020DEST_PATH_IMAGE030
Can be seen by the test-results shown in the table 30, the existing technique identical with the steel-making task is compared, and adopts processing method of the present invention can reach following beneficial effect:
Oxygen supply time shortens 23s; Lime consumption has reduced 1.9kg/t SteelDephosphorization efficient improves 4.6%; Iron and steel stock consumption reduces 2.8kg/t Steel
Although abovely in conjunction with the embodiments the specific embodiment of the present invention is had been described in detail, it is pointed out that protection scope of the present invention is not subjected to 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 that does not break away from technological thought of the present invention and purport, and these embodiments after changing obviously are also included within protection scope of the present invention.

Claims (9)

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 Sheng molten iron container.
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 1200 ℃ ~ 1550 ℃; Preferably, the temperature range of described molten iron is 1380 ℃ ~ 1550 ℃; Preferred, the temperature range of described molten iron is 1430 ℃ ~ 1550 ℃.
3. according to aforementioned claim 1 or 2 described smelting iron and steel slagging methods, it is characterized in that, described Sheng molten iron container is: general tank, and the ironworks is subjected to iron flask, and iron flask is converted by steel mill, fish torpedo ladle, one or more in the hot metal mixer.
4. according to aforementioned claim 1 or 2 described smelting iron and steel slagging methods, it is characterized in that, described steel melting furnace is converter or electric furnace.
5. iron and steel smelting process, described iron and steel smelting process comprises:
Before molten iron was blended into steel melting furnace, each described smelting iron and steel slagging method utilized described molten iron slag making in the employing according to claim 1-4 when molten iron is transferred to Sheng molten iron container; And will be blended into steel melting furnace through the molten iron of slag making and make steel.
6. slag making materials that in according to aforementioned claim, uses in each described method, it is characterized in that, described slag making materials is the mixture that comprises CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in the 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%, and surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and the ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
7. slag making materials according to claim 6 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.
8. slag making materials, it is characterized in that, described slag making materials is the mixture that comprises CaO and ferrous material, its chemical composition is: TFe 38.0% ~ 47.5% in the 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%, and surplus is other moiety and inevitable impurity, and the mass ratio of iron is 1:(1.2 ~ 2.5 in CaO and the ferrous material), preferable range is 1:(1.5 ~ 2.3), more preferably scope is 1:(1.8 ~ 2.1).
9. slag making materials according to claim 8 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.
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CN110343813A (en) * 2019-07-17 2019-10-18 首钢集团有限公司 A method of reducing lime consumption amount in complete three de- techniques
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CN106916942A (en) * 2017-04-19 2017-07-04 王冰 A kind of processing method of smelting iron and steel slag making
CN110343813A (en) * 2019-07-17 2019-10-18 首钢集团有限公司 A method of reducing lime consumption amount in complete three de- techniques
CN110387447A (en) * 2019-07-17 2019-10-29 首钢集团有限公司 A kind of method of lime consumption amount in reduction converter

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