CN203079999U - Device using fine ore and coal oxygen for direct steel-making - Google Patents
Device using fine ore and coal oxygen for direct steel-making Download PDFInfo
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- CN203079999U CN203079999U CN2013200107847U CN201320010784U CN203079999U CN 203079999 U CN203079999 U CN 203079999U CN 2013200107847 U CN2013200107847 U CN 2013200107847U CN 201320010784 U CN201320010784 U CN 201320010784U CN 203079999 U CN203079999 U CN 203079999U
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- direct steelmaking
- equipment
- gas
- fine ore
- fluidized bed
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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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
Abstract
The utility model relates to a device using fine ore and coal oxygen for direct steel-making. The device comprises a fine ore milling device, a fine ore lifting device, a multi-stage cyclone preheater, a pre-reduction circulating fluidized bed, a final reduction circulating fluidized bed, a direct steel-making furnace, a fine ore blowing device, a bottom blowing or side blowing coal oxygen gun, a first gas heat exchanger, a second gas heat exchanger, a third gas heat exchanger, a fourth gas heat exchanger, a gas pressurization device, a gas purification device and a CO2 and H2O gas removal device, wherein a discharge port of the fine ore milling device is connected with a feed port of the fine ore lifting device, and the discharge port of the fine ore lifting device is connected to the feed port of the multi-stage cyclone preheater; the discharge port of the multi-stage cyclone preheater is connected with the feed port of the pre-reduction circulating fluidized bed, and the discharge port of the pre-reduction circulating fluidized bed is connected with the feed port of the final reduction circulating fluidized bed; the final reduction circulating fluidized bed is connected with the direct steel-making device through the fine ore blowing device; and the bottom blowing or side blowing coal oxygen gun is inserted to the bottom or the side part of the direct steel-making furnace.
Description
Technical field
The utility model relates to steelmaking technical field, particularly a kind of equipment with fine ore and coal oxygen direct steelmaking.
Background technology
Current most important also the most common Steel Production Flow Chart is also referred to as long flow process, in this flow process, to obtain molten steel from iron ore and need to also have numerous auxiliary process links in addition through sintering (or pelletizing), coking, blast furnace ironmaking, four main process procedures of converter steelmaking.The reduction of iron ore is indirect reduction more than 70% in the blast furnace ironmaking, belong to gas-solid reaction, require blast furnace to keep air permeability and good, therefore smart fine ore of the iron that obtains after the lean ore ore dressing and rich ore piece fine ore end all must could be used for blast furnace through agglomeration, promptly must be through oversintering (or pelletizing) technological process.The material treatment capacity of sintering (or pelletizing) accounts for second of Steel Complex (being only second to ironmaking produces), and energy consumption is only second to ironmaking and steel rolling and occupies the 3rd.The purposes of coke in blast furnace, be fuel and the ferriferous oxide reductive agent of smelting institute's heat requirement as providing on the one hand, this effect now part is replaced by coal powder injection, the coke more important role is after the softening fusion of ore, as the skeleton that supports stock column, be again the coal gas path simultaneously up to tens of meters.The ratio of coking coal in raw coal is less, and reserves are limited, and this brings crisis certainly will for the development of the long flow process that relies on coking coal.The long flow process of tradition has developed into the peak, but the characteristics of blast furnace ironmaking have determined that traditional long flow process is in large scale, and investment is high, and the production cycle is long, the energy consumption per ton steel height, and environmental pollution is serious.
Directly reduction-electric furnace flow process also can obtain molten steel from iron ore, do not need coke, but the direct-reduced iron major part is produced with shaft furnace, still need fine iron ore agglomeration operation, and the natural gas source that need enrich, in the method relevant with direct reduction-electric furnace flow process, coal-based rotary kiln method production efficiency is low, and the rotary hearth furnace method is because the thin scale of the bed of material is difficult to expansion.Therefore directly reduction-electric furnace flow process still is difficult to and the long flow and method competition of tradition, and the output of steel share in worldwide only accounts for 5%, in China also seldom.
Melting and reducing-bof process has changed the degree of dependence of traditional long flow process STRENGTH ON COKE, for example, COREX fused reduction iron-smelting-bof process only needs a spot of coke, it only is divided into two the function of blast furnace on the principle, fusing separates after elder generation's gaseous state indirect reduction, but its shortcoming also is conspicuous: the big (500m of oxygen-consumption
3/ t), the long flow process of output investment ratio tradition is high by 10%～20%, and tempo is slow.Melting and reducing-bof process is the change to operation before the long flow process iron of tradition.
The utility model content
The purpose of this utility model is to overcome the deficiency of existing steelmaking equipment, thereby a kind of equipment with fine ore and coal oxygen direct steelmaking is provided.
To achieve these goals, the utility model provides a kind of equipment with fine ore and coal oxygen direct steelmaking, comprises abrasive dust ore deposit equipment 1, fine ore lift technique 2, multistage cyclone preheater 3, prereduction circulating fluidized bed 4, whole reduction circulating fluidized bed 5, direct steelmaking stove 6, fine ore blowing device 7, bottom blowing or side-blown coaloust-oxygen gun 8, first gas heat exchanger 11, second gas heat exchanger 13, the 3rd gas heat exchanger 14, the 4th gas heat exchanger 16, gas boosting equipment 12, gas purifying equipment 15 and gas removal CO
2And H
2O equipment 17; Wherein,
The discharge port of described abrasive dust ore deposit equipment 1 is connected with the opening for feed of described fine ore lift technique 2, and the discharge port of described fine ore lift technique 2 then is connected to the opening for feed of described multistage cyclone preheater 3; The discharge port of described multistage cyclone preheater 3 links to each other with the opening for feed of described prereduction circulating fluidized bed 4, and the discharge port of described prereduction circulating fluidized bed 4 then is connected with the opening for feed of the described circulating fluidized bed 5 of reduction eventually; The described circulating fluidized bed 5 of reduction eventually links to each other with described direct steelmaking stove 6 by described fine ore blowing device 7; Described bottom blowing or side-blown coaloust-oxygen gun 8 assign into the bottom or the sidepiece of described direct steelmaking stove 6;
The air outlet of described direct steelmaking stove 6 is connected to described first gas heat exchanger 11,11 of described first gas heat exchangers link to each other with described gas boosting equipment 12, described gas boosting equipment 12 is connected to the inlet mouth of the described circulating fluidized bed 5 of reduction eventually, and the air outlet of the described circulating fluidized bed 5 of reduction eventually is connected to second gas heat exchanger 13; Described second gas heat exchanger 13 is connected to the inlet mouth of described prereduction circulating fluidized bed 4, the air outlet of described prereduction circulating fluidized bed 4 is connected to described the 3rd gas heat exchanger 14, and described the 3rd gas heat exchanger 14 also is connected with the inlet mouth of described multistage cyclone preheater 3; The air outlet of described multistage cyclone preheater 3 is connected to described gas purifying equipment 15, and described gas purifying equipment 15 is by described the 4th gas heat exchanger 16 and described gas removal CO
2And H
2O equipment 17 links to each other described gas removal CO
2And H
2The air outlet of O equipment 17 is connected on the pipeline between described first interchanger 11 and the described gas boosting equipment 12.
In the technique scheme, described direct steelmaking stove 6 is barrel-shaped stove, and its inside comprises slag district, molten steel district and gas phase zone, and wherein gas phase zone is positioned at the top of described direct steelmaking stove 6, the molten steel district is positioned at the bottom of described direct steelmaking stove 6, and the slag district is then between gas phase zone and molten steel district.
In the technique scheme, when described fine ore blowing device 7 links to each other with described direct steelmaking stove 6, be inserted in the molten steel molten bath in molten steel district of described direct steelmaking stove 6.
In the technique scheme, described bottom blowing or side-blown coaloust-oxygen gun 8 are inserted in the bottom or lateral molten steel molten bath of described direct steelmaking stove 6.
In the technique scheme, also have direct steelmaking stove tap hole 9 and direct steelmaking stove slag notch 10 on the described direct steelmaking stove 6, direct steelmaking stove tap hole 9 wherein is positioned on the furnace wall in described direct steelmaking stove 6 outsides, and described direct steelmaking stove slag notch 10 then is positioned at the middle part of described direct steelmaking stove 6 outside furnace walls.
In the technique scheme, described direct steelmaking stove tap hole 9 is the siphon tapping mouth.
In the technique scheme, described direct steelmaking stove 6 also is provided with anti-material system, water-cooling system, and waste-gas cleaning is handled and residual neat recovering system.
Advantage of the present utility model is:
(1) the utility model is blown into high-temperature fusant with coal dust and oxygen and makes reducing gas, utilize gaseous suspension preheating of particulate fine iron ore and the gas phase reduction rate is fast, efficient is high advantage, in cyclone preheater and circulating fluidized bed,, the pre-reduced iron fine ore of the 90% above degree of metalization that obtains is blown into obtains molten steel in the high-temperature fusant respectively with fine iron ore preheating, reduction.Because reduction under lower temperature (comparing with the direct reduction of blast furnace ironmaking), the prereduction iron powder carburizing of generation is few, and decarburization is few when obtaining the finished product molten steel; The blast furnace-converter technology of the production crude steel of existing main flow is followed from the operational path of iron ore → molten iron → molten steel, is the process of decarburization after the first carburetting.The utility model makes the STEELMAKING PRODUCTION flow process obtain in essence simplification.
(2) the utility model has been realized from fine ore, coal, oxygen direct production molten steel, without agglomeration of fine ore, coking, also without the converter decarburization, compare with existing steelmaking process, equipment and initial cost are saved in a large number, and conservative calculating can be saved equipment and initial cost more than 30%; Logistics is fully simplified, in traditional Steel Plant, the logistics of each process procedure is very busy, and intensification cooling is for several times gone through in the iron content logistics, lose a large amount of physics heat, new direct steelmaking technology is very compact, and logistics is simply orderly, and has avoided the temperature loss of molten iron in transportation, be easy to realize directization of producing and control automatically, be intelligent Steel Plant of new generation, behind employing the utility model, great change takes place in the looks of Steel Plant.
Description of drawings
Fig. 1 is that schema is shown in device letter of the present utility model.
The drawing explanation
1 abrasive dust ore deposit equipment, 2 fine ore lift technique, 3 multistage cyclone preheaters
4 prereduction circulating fluidized beds 5 are reduction circulating fluidized bed 6 direct steelmaking stoves eventually
7 fine ore blowing devices, 8 bottom blowing coaloust-oxygen guns, 9 direct steelmaking stove tap holes
10 direct steelmaking stove slag notches, 11 first gas heat exchangers, 12 gas boosting equipment
13 second gas heat exchangers 14 the 3rd gas heat exchanger, 15 gas purifying equipments
16 the 4th gas heat exchangers, 17 gas removal CO
2And H
2O equipment.
Embodiment
Now the utility model will be further described in conjunction with the accompanying drawings.
As shown in Figure 1, in one embodiment, direct steelmaking equipment of the present utility model comprises: abrasive dust ore deposit equipment 1, fine ore lift technique 2, multistage cyclone preheater 3, prereduction circulating fluidized bed 4, whole reduction circulating fluidized bed 5, direct steelmaking stove 6, fine ore blowing device 7, bottom blowing or side-blown coaloust-oxygen gun 8, first gas heat exchanger 11, second gas heat exchanger 13, the 3rd gas heat exchanger 14, the 4th gas heat exchanger 16, gas boosting equipment 12, gas purifying equipment 15 and gas removal CO
2And H
2O equipment 17.Wherein, the discharge port of described abrasive dust ore deposit equipment 1 is connected with the opening for feed of fine ore lift technique 2, and the discharge port of fine ore lift technique 2 then is connected to the opening for feed of described multistage cyclone preheater 3; The discharge port of multistage cyclone preheater 3 links to each other with the opening for feed of prereduction circulating fluidized bed 4, and the discharge port of described prereduction circulating fluidized bed 4 then is connected with the opening for feed of whole reduction circulating fluidized bed 5; Reduction circulating fluidized bed 5 links to each other with direct steelmaking stove 6 by fine ore blowing device 7 eventually; Bottom blowing or side-blown coaloust-oxygen gun 8 assign into the bottom or the sidepiece of direct steelmaking stove 6; The air outlet of direct steelmaking stove 6 is connected to first gas heat exchanger 11,11 of first gas heat exchangers link to each other with gas boosting equipment 12, gas boosting equipment 12 is connected to the inlet mouth of reduction circulating fluidized bed 5 eventually, and the air outlet of reduction circulating fluidized bed 5 is connected to second gas heat exchanger 13 eventually; Second gas heat exchanger 13 is connected to the inlet mouth of prereduction circulating fluidized bed 4, and the air outlet of prereduction circulating fluidized bed 4 is connected to the 3rd gas heat exchanger 14, the three gas heat exchangers 14 and also is connected with the inlet mouth of multistage cyclone preheater 3; The air outlet of multistage cyclone preheater 3 is connected to gas purifying equipment 15, and gas purifying equipment 15 is by the 4th gas heat exchanger 16 and gas removal CO
2And H
2O equipment 17 links to each other gas removal CO
2And H
2The air outlet of O equipment 17 is connected on the pipeline between first interchanger 11 and the gas boosting equipment 12.
Below each parts in the direct steelmaking equipment are further described.
Described direct steelmaking stove 6 is barrel-shaped stoves, and its inside comprises slag district, molten steel district and gas phase zone, and wherein gas phase zone is positioned at the top of direct steelmaking stove 6, and the molten steel district is positioned at the bottom of direct steelmaking stove 6, and the slag district is then between gas phase zone and molten steel district.When fine ore blowing device 7 links to each other with direct steelmaking stove 6, be inserted in the molten steel molten bath in molten steel district of direct steelmaking stove 6, bottom blowing or side-blown coaloust-oxygen gun 8 then are inserted in the bottom or lateral molten steel molten bath of direct steelmaking stove 6.
Also have direct steelmaking stove tap hole 9 and direct steelmaking stove slag notch 10 on the direct steelmaking stove 6, direct steelmaking stove tap hole 9 wherein is positioned on the furnace wall in direct steelmaking stove 6 outsides, and direct steelmaking stove slag notch 10 then is positioned at the middle part of direct steelmaking stove 6 outside furnace walls.Described direct steelmaking stove tap hole 9 is the siphon tapping mouth.
As a kind of preferred implementation, in the direct steelmaking equipment of the present utility model, described direct steelmaking stove 6 also is provided with anti-material system, water-cooling system, and waste-gas cleaning is handled and residual neat recovering system.
Working process to direct steelmaking equipment of the present utility model describes below.
At first, in direct steelmaking stove 6, be pre-formed a molten steel molten bath, or slag blended molten bath, temperature is more than 1600 ℃; In direct steelmaking stove 6, be blown into coal dust, oxygen and a small amount of flux then, thereby produce CO+H
285% reducing gas.These reducing gas flow through reduction circulating fluidized bed 5, prereduction circulating fluidized bed 4, multistage cyclone preheater 3 eventually successively after the air outlet output of direct steelmaking stove 6.
Abrasive dust ore deposit equipment 1 is finely ground to iron ore below 100 orders more than 325 orders, then this micro mist is promoted to the opening for feed of multistage cyclone preheater 3 with fine ore lift technique 2, fine iron ore is heated in multistage cyclone preheater 3, and the fine ore after the heating is transferred to again in the prereduction circulating fluidized bed 4.Meanwhile, the tail gas that multistage cyclone preheater 3 is produced (reducing gas that the direct steelmaking stove of promptly being mentioned is hereinafter produced is through reducing circulating fluidized bed 5, prereduction circulating fluidized bed 4 and the remaining gas in multistage cyclone preheater 3 backs eventually) purifies by gas purifying equipment 15, and then through 16 coolings of the 4th gas heat exchanger, then again by removing CO
2And H
2O equipment 17 removes CO wherein
2And water vapor.
The high temperature reduction gas that direct steelmaking stove 6 produces with remove CO
2Recycled offgas and circulating fluidized bed exit gas at different levels heat exchange after be cooled to below 850 ℃, reducing gas is opposite with the flow direction of fine ore, by whole reduction circulating fluidized bed 5, prereduction circulating fluidized bed 4 and multistage cyclone preheater 3.The reducing gas temperature of every grade of circulating fluidized bed outlet reduces, and the high temperature reduction gas that therefore need and go out direct steelmaking stove 6 carries out heat exchange to improve temperature.The recycled offgas that goes out multistage cyclone preheater 3 need remove CO wherein
2And water vapor, mix with the high temperature reduction gas that goes out direct steelmaking stove 6 again, be warming up to 850 ℃, feed circulating fluidized bed then; In circulating fluidized bed, powdered iron ore and reducing gas generation reduction reaction, the degree of metalization that goes out the fine iron ore of last step circulating fluidized bed reaches more than 90%.
In the direct steelmaking stove, be blown into the fine iron ore more than 90% through preheating and reduction back degree of metalization with nitrogen, continue in the direct steelmaking stove, to be blown into coal dust and oxygen and a small amount of flux simultaneously, by adjusting the ratio of coal dust, oxygen, fine iron ore, can be so that the carbon content of molten steel remains on below 0.4%, simultaneously can remove most phosphorus and a spot of sulphur, molten steel and slag constantly increase in the molten bath, flow out by siphon tapping mouth 9 and slag notch 10.
Through behind the aforesaid operations of direct steelmaking stove of the present utility model, in the resulting crude molten steel, the content of C is about 0.1～0.8%, and the content of Si, Mn＜0.05% can obtain qualified molten steel through follow-up external refining and deoxidation alloying operation.
It should be noted last that above embodiment is only unrestricted in order to the explanation the technical solution of the utility model.Although the utility model is had been described in detail with reference to embodiment, those of ordinary skill in the art is to be understood that, the technical solution of the utility model is made amendment or is equal to replacement, the spirit and scope that do not break away from technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (7)
1. equipment with fine ore and coal oxygen direct steelmaking, it is characterized in that, comprise abrasive dust ore deposit equipment (1), fine ore lift technique (2), multistage cyclone preheater (3), prereduction circulating fluidized bed (4), whole reduction circulating fluidized bed (5), direct steelmaking stove (6), fine ore blowing device (7), bottom blowing or side-blown coaloust-oxygen gun (8), first gas heat exchanger (11), second gas heat exchanger (13), the 3rd gas heat exchanger (14), the 4th gas heat exchanger (16), gas boosting equipment (12), gas purifying equipment (15) and gas removal CO
2And H
2O equipment (17); Wherein,
The discharge port of described abrasive dust ore deposit equipment (1) is connected with the opening for feed of described fine ore lift technique (2), and the discharge port of described fine ore lift technique (2) then is connected to the opening for feed of described multistage cyclone preheater (3); The discharge port of described multistage cyclone preheater (3) links to each other with the opening for feed of described prereduction circulating fluidized bed (4), and the discharge port of described prereduction circulating fluidized bed (4) then is connected with the described opening for feed of reduction circulating fluidized bed (5) eventually; Described reduction circulating fluidized bed (5) eventually links to each other with described direct steelmaking stove (6) by described fine ore blowing device (7); Described bottom blowing or side-blown coaloust-oxygen gun (8) assign into the bottom or the sidepiece of described direct steelmaking stove (6);
The air outlet of described direct steelmaking stove (6) is connected to described first gas heat exchanger (11), described first gas heat exchanger (11) then links to each other with described gas boosting equipment (12), described gas boosting equipment (12) is connected to the described inlet mouth of reduction circulating fluidized bed (5) eventually, and the described air outlet of reduction circulating fluidized bed (5) eventually is connected to second gas heat exchanger (13); Described second gas heat exchanger (13) is connected to the inlet mouth of described prereduction circulating fluidized bed (4), the air outlet of described prereduction circulating fluidized bed (4) is connected to described the 3rd gas heat exchanger (14), and described the 3rd gas heat exchanger (14) also is connected with the inlet mouth of described multistage cyclone preheater (3); The air outlet of described multistage cyclone preheater (3) is connected to described gas purifying equipment (15), and described gas purifying equipment (15) is by described the 4th gas heat exchanger (16) and described gas removal CO
2And H
2O equipment (17) links to each other, described gas removal CO
2And H
2The air outlet of O equipment (17) is connected on the pipeline between described first interchanger (11) and the described gas boosting equipment (12).
2. the equipment with fine ore and coal oxygen direct steelmaking according to claim 1, it is characterized in that, described direct steelmaking stove (6) is barrel-shaped stove, its inside comprises slag district, molten steel district and gas phase zone, wherein gas phase zone is positioned at the top of described direct steelmaking stove (6), the molten steel district is positioned at the bottom of described direct steelmaking stove (6), and the slag district is then between gas phase zone and molten steel district.
3. the equipment with fine ore and coal oxygen direct steelmaking according to claim 2 is characterized in that, described fine ore blowing device (7) and described direct steelmaking stove (6) be when linking to each other, and is inserted in the molten steel molten bath in molten steel district of described direct steelmaking stove (6).
4. the equipment with fine ore and coal oxygen direct steelmaking according to claim 2 is characterized in that, described bottom blowing or side-blown coaloust-oxygen gun (8) are inserted in the bottom or lateral molten steel molten bath of described direct steelmaking stove (6).
5. the equipment with fine ore and coal oxygen direct steelmaking according to claim 1, it is characterized in that, also have direct steelmaking stove tap hole (9) and direct steelmaking stove slag notch (10) on the described direct steelmaking stove (6), direct steelmaking stove tap hole (9) wherein is positioned on the furnace wall in described direct steelmaking stove (6) outside, and described direct steelmaking stove slag notch (10) then is positioned at the middle part of described direct steelmaking stove (6) outside furnace wall.
6. the equipment with fine ore and coal oxygen direct steelmaking according to claim 5 is characterized in that described direct steelmaking stove tap hole (9) is the siphon tapping mouth.
7. the equipment with fine ore and coal oxygen direct steelmaking according to claim 1 is characterized in that, described direct steelmaking stove (6) also is provided with anti-material system, water-cooling system, and waste-gas cleaning is handled and residual neat recovering system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200107847U CN203079999U (en) | 2013-01-09 | 2013-01-09 | Device using fine ore and coal oxygen for direct steel-making |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200107847U CN203079999U (en) | 2013-01-09 | 2013-01-09 | Device using fine ore and coal oxygen for direct steel-making |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203079999U true CN203079999U (en) | 2013-07-24 |
Family
ID=48825857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013200107847U Expired - Fee Related CN203079999U (en) | 2013-01-09 | 2013-01-09 | Device using fine ore and coal oxygen for direct steel-making |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203079999U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060505A (en) * | 2013-01-09 | 2013-04-24 | 莱芜钢铁集团有限公司 | Equipment for directly making steel by using fine ore and coal oxygen |
| CN108374067A (en) * | 2018-04-09 | 2018-08-07 | 东北大学 | A kind of device and method of reduction direct steelmaking at full speed |
| CN113789420A (en) * | 2021-08-10 | 2021-12-14 | 赵晓 | Direct steelmaking device for iron-containing powder in reducing atmosphere and use method |
-
2013
- 2013-01-09 CN CN2013200107847U patent/CN203079999U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103060505A (en) * | 2013-01-09 | 2013-04-24 | 莱芜钢铁集团有限公司 | Equipment for directly making steel by using fine ore and coal oxygen |
| CN108374067A (en) * | 2018-04-09 | 2018-08-07 | 东北大学 | A kind of device and method of reduction direct steelmaking at full speed |
| CN108374067B (en) * | 2018-04-09 | 2019-07-02 | 东北大学 | A kind of device and method of reduction direct steelmaking at full speed |
| CN113789420A (en) * | 2021-08-10 | 2021-12-14 | 赵晓 | Direct steelmaking device for iron-containing powder in reducing atmosphere and use method |
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130724 Termination date: 20160109 |