CN102925610A - Electricity-coal process melting and reduction ironmaking technology - Google Patents
Electricity-coal process melting and reduction ironmaking technology Download PDFInfo
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- CN102925610A CN102925610A CN2012104033382A CN201210403338A CN102925610A CN 102925610 A CN102925610 A CN 102925610A CN 2012104033382 A CN2012104033382 A CN 2012104033382A CN 201210403338 A CN201210403338 A CN 201210403338A CN 102925610 A CN102925610 A CN 102925610A
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Abstract
The invention relates to an electricity-coal process melting and reduction ironmaking technology. The electricity-coal process melting and reduction ironmaking technology comprises the following steps of: conveying metallized pellets produced by a gas/coal-based direct reduction device into a heat preservation storage silo of a melting and reduction furnace by utilizing a hot delivery device at the temperature of 900-1000 DEG C under non-oxidizing conditions, completing mixture making in the heat preservation storage silo, then conveying the mixture into a high-temperature area in the furnace, then heating by utilizing electric arc to melt the mixture, simultaneously spraying carbon powder to perform reduction, and then performing technological slagging off and electric arc heating melting in a circulating manner till the temperature and the ingredients of a sample achieve the standards, wherein the mixture making in the heat preservation storage silo is performed by mixing the metallized pellets, a reducing agent and slag charge according to the weight ratio of 85: 15: 5. The electricity-coal process melting and reduction ironmaking technology disclosed by the invention is designed against low-grade ores, refractory ores and complex ores, open-burning coal is used as energy, the carbon-containing metallized pellets are taken as raw materials, a final reduction technology for directly producing molten iron (or titanium refining slag and the like) is solved, and the electricity-coal process melting and reduction ironmaking technology is of a key technology for sustainable development of iron and steel industry in China, energy conservation, emission reduction and environment-friendly development.
Description
Technical field
The invention belongs to the ironmaking technology field, be specifically related to the molten minute reduction iron production technology of a kind of electricity-coal method.
Background technology
Direct-reduction and reduction in molten minute are the main bodys of modern non-blast furnace ironmaking, all are that to break away from that blast furnace process relies on coking coal be purpose steel industry cutting edge technology.So far, the non-blast furnace ironmaking technique of developing in the world is a lot, but the technique of industrialization and few, even also equal existing problems of its technique of method such as COREX, the FINEX of industrialization or preliminary industrialization and production process design.The technique of existing direct-reduced iron and production unit such as rotary hearth furnace, shaft furnace, rotary kiln, fluidized-bed etc. both can be used as the prereduction unit of reduction in molten minute, also can be used as the production unit of direct-reduced iron, similar on apparatus-form, principle is identical, comparatively speaking comparative maturity.And the technique of reduction industrialization in molten minute and few, a molten minute reduction iron production technology is the cutting edge technology of Iron And Steel Industry in modern age, is one of China's Iron And Steel Industry important channel of realizing Sustainable development.
The COREX method is unique molten minute reduction iron production technology that has been used for suitability for industrialized production.Because this technique has been avoided coking and the sintering process of blast furnace ironmaking flow process, coking coal environmental pollution two hang-ups deficient and that bring owing to coking and sintering have been solved, applicable coal and iron ore kind are extensive, flow process is short, is at present to substitute comparatively speaking ripe non-blast furnace ironmaking technology of traditional blast furnace ironmaking.
But, by the COREX(C-3000 that goes into operation and move that introduces) molten divided by reduction technique and equipment, it compares maximum characteristics with traditional blast furnace technology be to use less coke, but still unrealized fully without coke production, fail to realize re-set target at aspects such as production capacity, energy consumption, operating rate, molten iron costs.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the object of the present invention is to provide the molten minute reduction iron production technology of a kind of electricity-coal method, for low grade ore, difficult ore dressing, complex ore, take non-coking as the energy, take carbonaceous metallized pellet as raw material, having solved the whole reducing process of direct production molten iron (perhaps refining titanium slag etc.), is the gordian technique of China's Iron And Steel Industry sustainable development, realization energy-saving and emission-reduction, environmental friendliness development.
To achieve these goals, the technical solution used in the present invention is:
The molten minute reduction iron production technology of a kind of electricity-coal method, send device under 900～1000 ℃ of non-oxide conditions, to be transported to the insulation storage bin of molten minute reduction furnace the metallized pellet utilization heat of gas/coal-based direct reduction device fabrication, deliver to the furnace high-temperature district after finishing therein batching, then utilize electric-arc heating to make the batching fusing, spraying simultaneously carbon dust reacts, then looping manufacturability skims and the electric-arc heating fusing, until temperature and the composition of sampling are up to standard, wherein batching is with metallized pellet in the insulation storage bin: reductive agent: slag charge mixes according to mass ratio 85:15:5.
Further, in the described metallized pellet TFe massfraction greater than 65%.
Further, described metallized pellet is TFe, FeO, MFe, the SiO of 69.07:13.32:58.71:10.94:6.74:2.22:3.32:1.024:0.06:3.00 by mass ratio
2, CaO, MgO, Al
2O
3, S, P and C form.
Further, described reductive agent is coke or coal dust.
Further, described coke is C, S, the SiO of 85.04:0.87:49.99:34.09:3.02:0.95:9.46:0.88:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms; Described coal dust is C, S, the SiO of 76.49:0.36:48.31:35.82:3.68:1.03:6.95:2.98:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms.
Further, described slag charge derives from the limestone kiln and produces as solvent, and its composition is: massfraction is 0.014% P; 0.012% S; 52.78% CaO; 1.32% MgO; 1.62% SiO
21.32% Al
2O
30.02% P
2O
50.03% SO
3And 42.884% scaling loss.
Further, described gas/coal-based direct reduction equipment comprises rotary hearth furnace, shaft furnace or rotary kiln.
Further, described carbon dust is to spray from the built-in stirring rifle of body of heater, and the material to fusing when stirring rifle spray carbon dust stirs.
Further, the straying quatity of described carbon dust is the 5-10% of reductive agent add-on.
Further, the body of heater of described molten minute reduction furnace seals, and keeps pressure-fired---strongly reducing atmosphere with weld pool surface in stove.
Further, the employing of the body of heater of described molten minute reduction furnace is rolled to fascinate and is slagged tap, taps a blast furnace, and described furnace charge and solvent adopt the melting of electric arc open arc.
Compared with prior art, advantage of the present invention is:
(1) reduction in molten minute as main energy sources production molten iron (perhaps refining titanium slag, vanadium slag etc.), thereby does not need to use day by day poorness and the more and more higher coking coal of price to produce molten iron as main energy sources with electric energy (arc melting) and common coal (reduction of spray carbon and flux).And can adopt long arc, Operation of Submerged Arc in Foamed Slag, and strong power supply system heat fused furnace charge, electrical efficiency and thermo-efficiency are high, and tap to tap time is short, less energy consumption.
(2) furnace charge partly or entirely (100%) adopt all iron content (TFe) 〉=65% of producing with the abundant poor iron ore deposit of China's standing stock the grade metallized pellet as main raw material, and needn't rely on the high-quality iron ore resource fully.
(3) adopt that metallized pellet heat is sent, the hot charging technology, the heat preservation technology of storage bin and feed mechanism reduces the energy consumption save energy.
(4) adopting the furnace sealing structure, in stove, guarantee pressure-fired with weld pool surface---strongly reducing atmosphere, reduction efficiency is high.
(5) body of heater arranges the stirring rifle, its rifle body can about, swing and the forward-reverse agitation molten pool, stir rifle the dynamic conditions (stirring) of chemical reaction and the reductive agent (spray carbon dust) of reduction reaction namely can be provided, also can provide other process functions in addition.
(6) body of heater of molten minute reduction furnace adopts that rolling fascinates slags tap, taps a blast furnace so that the body of heater volume corrodes because of anti-material, the top of the slag, when liquid level changes, and manufacturability can both be smoothly when skimming, accurately slag tap, tap a blast furnace; " bridging " phenomenon that body of heater rolls and fascinates and can dissolve slag (furnace charge).
(7) molten minute reduction furnace adopts the melting of electric arc open arc, the submerged arc operation, and thermo-efficiency, electrical efficiency are high; Coal powder spray is fluxed, and for electricity, reduces power consumption according to coal.
Embodiment
Below in conjunction with embodiment the present invention is described in further details.
The molten minute reduction iron production technology of a kind of electricity-coal method, its technical process is:
The first step, from the metallized pellet exit material feeding of the usefulness gas/coal-based direct reduction device fabrications such as rotary hearth furnace (perhaps shaft furnace, rotary kiln), the TFe massfraction is greater than 70% in the wherein said metallized pellet;
Second step send device thermometal pelletizing (900～1000 ℃) to be transported to the insulation storage bin of molten minute reduction furnace under non-oxide condition with high spud angle metal pelletizing heat;
The 3rd step, carry out weighing in insulation in the storage bin, according to metallized pellet: reductive agent: the mass ratio 85:15:5 of slag charge prepares burden, wherein:
Metallized pellet is TFe, FeO, MFe, the SiO of 69.07:13.32:58.71:10.94:6.74:2.22:3.32:1.024:0.06:3.00 by mass ratio
2, CaO, MgO, Al
2O
3, S, P and C form.
Reductive agent is coke, is C, S, the SiO of 85.04:0.87:49.99:34.09:3.02:0.95:9.46:0.88:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms.
Slag charge derives from the limestone kiln and produces as solvent, and its composition is: massfraction is 0.014% P; 0.012% S; 52.78% CaO; 1.32% MgO; 1.62% SiO
21.32% Al
2O
30.02% P
2O
50.03% SO
3And 42.884% scaling loss.
The 4th step, finish and deliver to the furnace high-temperature district after the batching and make the batching fusing with electric-arc heating, spray simultaneously carbon dust and react, straying quatity is about the 5-10% of reductive agent add-on, to guarantee pressure-fired---strongly reducing atmosphere.Wherein carbon dust is to spray from the built-in stirring rifle of body of heater, when stirring rifle spray carbon dust material is stirred.
In the 5th step, the thermometric sampling sees whether the temperature of sampling and composition be up to standard, if not up to standard, then continues next step.
The 6th step looped that manufacturability is skimmed and electric-arc heating fusing, during carry out the thermometric sampling, until temperature and the composition of sampling are up to standard.
In the 7th step, the front technique of tapping a blast furnace is skimmed, and then taps a blast furnace, and carries out other rear art breading.
In the said process, the molten body of heater of reduction furnace that divides seals, and keeps pressure-fired---strongly reducing atmosphere with weld pool surface in stove, and the body of heater employing rolling of molten minute reduction furnace is fascinated and slagged tap, taps a blast furnace, and furnace charge and solvent adopt the melting of electric arc open arc.
An alternative embodiment of the invention, reductive agent uses coal dust, is C, S, the SiO of 76.49:0.36:48.31:35.82:3.68:1.03:6.95:2.98:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms.
Among the present invention, if MgO content is lower than 1% in the slag charge, then can adds rhombspar and adjust about basicity to 1.
Molten minute stove hot metal composition before tapping a blast furnace is analyzed, and its quality component is: 96.71% Fe, 2.50% C, 0.56% Si, 0.09% Mn and micro-P and S, and basicity of slag about 1.2, temperature is higher than 1450 ℃.
Claims (10)
1. electricity-coal method melts a minute reduction iron production technology, it is characterized in that, send device under 900～1000 ℃ of non-oxide conditions, to be transported to the insulation storage bin of molten minute reduction furnace the metallized pellet utilization heat of gas/coal-based direct reduction device fabrication, deliver to the furnace high-temperature district after finishing therein batching, then utilize electric-arc heating to make the batching fusing, spraying simultaneously carbon dust reacts, then looping manufacturability skims and the electric-arc heating fusing, until temperature and the composition of sampling are up to standard, wherein batching is with metallized pellet in the insulation storage bin: reductive agent: slag charge mixes according to mass ratio 85:15:5.
2. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, the TFe massfraction is greater than 65% in the described metallized pellet.
3. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, described metallized pellet is TFe, FeO, MFe, the SiO of 69.07:13.32:58.71:10.94:6.74:2.22:3.32:1.024:0.06:3.00 by mass ratio
2, CaO, MgO, Al
2O
3, S, P and C form.
4. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, described reductive agent is coke or coal dust.
5. described electricity-coal method melts a minute reduction iron production technology according to claim 4, it is characterized in that, described coke is C, S, the SiO of 85.04:0.87:49.99:34.09:3.02:0.95:9.46:0.88:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms; Described coal dust is C, S, the SiO of 76.49:0.36:48.31:35.82:3.68:1.03:6.95:2.98:2.35:2.33:0.4 6:0.83 by mass ratio
2, Al
2O
3, CaO, MgO, FeO, Fe
2O
3, H
2, O
2, N
2, H
2O forms.
6. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, described slag charge derives from the limestone kiln and produces as solvent, and its composition is: massfraction is 0.014% P; 0.012% S; 52.78% CaO; 1.32% MgO; 1.62% SiO
21.32% Al
2O
30.02% P
2O
50.03% SO
3And 42.884% scaling loss.
7. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, described gas/coal-based direct reduction equipment comprises rotary hearth furnace, shaft furnace or rotary kiln.
8. described electricity-coal method melts a minute reduction iron production technology according to claim 1, it is characterized in that, described carbon dust is to spray into from the built-in stirring rifle of body of heater, and the material to fusing when stirring rifle spray carbon dust stirs.
9. according to claim 1 or molten minute reduction iron production technology of 8 described electricity-coal methods, it is characterized in that, the straying quatity of described carbon dust is the 5-10% of reductive agent add-on.
10. molten minute reduction iron production technology of described electricity-coal method according to claim 1 is characterized in that, the body of heater of described molten minute reduction furnace seals, in stove and weld pool surface keep pressure-fired---strongly reducing atmosphere.
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Cited By (4)
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| CN103333979A (en) * | 2013-03-19 | 2013-10-02 | 陈存运 | Smelting reduction electric ironmaking system using electricity-coal method, and technological process thereof |
| CN106119532A (en) * | 2016-08-01 | 2016-11-16 | 江苏省冶金设计院有限公司 | Process the method and system of red mud |
| CN109929957A (en) * | 2019-03-28 | 2019-06-25 | 东北大学 | A kind of device and method of pre-reduced iron ore high melt production molten iron |
| CN115125348A (en) * | 2022-06-17 | 2022-09-30 | 攀钢集团西昌钢钒有限公司 | Method and system for efficiently using metallized pellets of rotary hearth furnace |
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Application publication date: 20130213 |