CN101684507B - Direct steel making technique by reducing iron ore with gas - Google Patents
Direct steel making technique by reducing iron ore with gas Download PDFInfo
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- CN101684507B CN101684507B CN2008101400824A CN200810140082A CN101684507B CN 101684507 B CN101684507 B CN 101684507B CN 2008101400824 A CN2008101400824 A CN 2008101400824A CN 200810140082 A CN200810140082 A CN 200810140082A CN 101684507 B CN101684507 B CN 101684507B
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Abstract
The invention discloses a direct steel making technique by reducing iron ore with gas, comprising: firstly, adding iron ore and prereducing mineral powder into an iron slag bath, dissolving the iron ore or the prereducing mineral powder into the slag, blowing reducing gas into the slag layer, reducing the slag containing FeO, and obtaining molten steel with carbon content less than 1.3%. CO generated in the reduction reaction is mainly used for secondary combustion to compensate heat energy needed by the reduction reaction, and the exhaust gas is used for prewarming and prereducing (the iron mineral is prereduced in very weak reducing atmosphere). The technique fully utilizes the features that the reducing gas will not carburize and siliconize the molten steel, and implements the production of molten steel from iron mineral only by one direct steel-smelting furnace. The technique of the invention has advantages of high yield, low energy consumption per ton steel, save of equipment and construction investment, sufficient simplification of physical distribution, and the technique avoids temperature loss of the molten iron in transport process, and easily implements continuous production and automation control.
Description
Technical field
The present invention relates to the production technique of steel, relate in particular to a kind of technology of reducing iron ore with gas direct production molten steel.
Background technology
Current most important Steel Production Flow Chart (long flow process) obtains molten steel from iron ore, needs to also have numerous auxiliary process links through sintering (or pelletizing), coking, blast furnace ironmaking, four main technique links 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, so the fine iron breeze that obtains after the lean ore ore dressing all must pass through agglomeration with rich ore lump ore powder and could supply the blast furnace use, promptly 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 the stock column up to tens of meters, is again the coal gas path simultaneously.The ratio of coking coal in raw coal is less, and reserves are limited, and this brings sense of 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, and energy consumption per ton steel is high, 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 dri major part is used shaft furnace production, still needs the iron mineral powder agglomeration operation, and needs abundant natural gas source; 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 process competition of tradition, and the output of steel share in worldwide only accounts for 5%, and China then 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, and 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 one bof process is the change to operation before the long flow process iron of tradition.
Also have some patents to propose direct steelmaking or step steel-making, CN87101210A inventor makes reductive agent and fuel with carbon simultaneously in converter, and a large amount of CO of generation only do preheating and use; Reclaim its physics heat; This is uneconomic, also is in theory to run counter to the ironmaking principle, can not be accomplished.He mention with intermediate frequency furnace or electric arc furnace direct steelmaking, do not utilize a large amount of CO of generation equally, power consumption will be very big, can not be used for producing.Patent CN1116240A and patent CN87101210A, author are same people, and the know-why basically identical increases and refinement on the content a little.
Patent CN1087951A obtains the technology of sponge iron, is equivalent to coal-based shaft furnace process in theory, and the ironmaking circle generally acknowledges that this technology is immature, and production cost is higher.Fatal shortcoming of this patent is that to get into superior part holding chamber up when the pore of high temperature reduction gas through sponge iron chute bottom, and when the ore preheating reduce, the chute pore blocked easily, as changed the then realization easily of side-blown reducing gas into.This patent is not mentioned iron ore yet must agglomeration.Fine ore can not pass through reduction shaft furnace.The raw material that patent CN1348013A uses is a pellet, and the know-why that obtains sponge iron also is equivalent to coal-based shaft furnace process, compares infeasible economically with traditional process.
Patent CN1223301A produces sponge iron with the complex mechanism of tunnel, charging ram and ploughshare plate, and its reaction mechanism is similar to coal-based rotary kiln technology, and patent CN1818082A reaction mechanism also is similar to coal-based rotary kiln technology, and production efficiency can not be high.
Patent CN1850997A proposes to use the induction furnace direct steelmaking; Adding powdered iron ore, coal, flux obtain molten iron earlier in same induction furnace, and oxygen blast obtains molten steel with adding flux in molten iron then, is feasible on know-why; But induction furnace small scale; Power consumption is big, and is uneconomical, can not scale operation.
Patent CN1851000A proposes to utilize the converter direct steelmaking with the mixture block of powdered iron ore and pulverized anthracite, this method top BOTTOM OXYGEN simultaneously in the mixture block.BOTTOM OXYGEN only can be with the continuous oxidation of the Fe that restores, and the essence of this reaction is exactly the continuous oxidation of coal.Correct method should be to reduce with coal in the slag district; Also can blow a spot of oxygen in the slag district to increase the heat of reaction; The amount of being blown into through control oxygen realizes coal reduced iron mineral; In gas phase zone oxygen blast secondary combustion, the heat of secondary combustion offers the heat absorption of slag district reduction reaction, but BOTTOM OXYGEN red stone liquid never again.Therefore the method coal consumption of this patent proposition is high, and productivity is not necessarily high, and big production gone up very difficult the realization.
The iron smelting method that patent CN1073212A proposes, consistent with the cyclone furnace formula melting and reducing flow process that gondola Yi Waer company develops on the principle with the Huo Gewen Iron And Steel Company of Holland in 1988, British Steel Corporation.Cyclone furnace formula melting and reducing has only carried out semipilot, has no progress so far.
Summary of the invention
To the deficiency of prior art, the present invention provides a kind of direct steel making technique by reducing iron ore with gas.
The present invention provides a kind of direct steel making technique by reducing iron ore with gas, comprises the following steps:
1) be pre-formed an iron bath or slag iron blended molten bath in the direct steelmaking stove, temperature is more than 1400 ℃;
2) ferrous material and flux are loaded in the direct steelmaking stove, and the ferrous material of adding dissolves very soon and gets in the slag, is blown into reducing gas to slag blanket, and this reducing gas reduction contains the FeO slag, obtain carbon content less than 1.3% molten steel;
3) warm air that in the space of direct steelmaking slag layer top, is blown into oxygen or 500～1200 ℃ produces high-temp waste gas with the C0 that the burning reduction reaction produces;
4) molten steel and slag directly flow out from siphon tapping mouth and slag notch in the direct steelmaking stove.
Preferably, step 2) said ferrous material chosen from Fe fine ore, contain fine iron ore, contain iron ore, the iron content pellet, through in powdered iron ore, iron scale and/or the ion dust mud contaning of fine grinding prereduction one or more;
Preferably, step 2) said flux is unslaked lime and rhombspar.
Preferably, step 2) said ferrous material and flux can add with the charge hoisting by belt conveyer machine, add or use N with screw feeder
2The spray gun of doing carrier gas sprays into.
Preferably, step 2) the said reducing gas mixture that is Sweet natural gas, coke-oven gas or Sweet natural gas and coke-oven gas.Sweet natural gas can mix with arbitrary proportion with the mixture of coke-oven gas, and preferred, the volume ratio of Sweet natural gas and coke-oven gas is 1:100～100:1; Preferred, the volume ratio of Sweet natural gas and coke-oven gas is 1:50～50:1.
Preferably, the bottom from the direct steelmaking stove is blown into N in the step 3)
2The molten bath is mixed in gas mixing.
Preferably, the high-temp waste gas of direct steelmaking stove can generate electricity with waste heat boiler cooling recovery sensible heat.
Preferably, powdered iron ore carried out joining after the fine grinding preheating prereduction carry out direct steelmaking in the direct steelmaking stove, powdered iron ore and Wingdale mix and are finely ground to below 40 microns, in Transport Bed equipment with the heating by the exhaust gases prereduction behind the upgrading of direct steelmaking stove.
The present invention also provides a kind of direct steelmaking equipment, comprising: fine ore Transport Bed (1), feeding device (2), reducing gas spray gun (3), gas phase zone secondary combustion oxygen rifle (4), direct steelmaking stove (5), direct steelmaking stove slag notch (6), direct steelmaking stove tap hole (7); Direct steelmaking stove (5) is barrel-shaped stove, comprises slag district and molten iron district.Transport Bed equipment (1) is arranged above the direct steelmaking stove, and Transport Bed equipment (1) links to each other with direct steelmaking stove (5) through feeding device (2); Reducing gas spray gun (3) inserts the slag district; Gas phase zone secondary combustion oxygen rifle (4) is inserted into the gas-phase space of direct steelmaking stove top; Direct steelmaking stove slag notch (6) is positioned at furnace wall middle part, the direct steelmaking stove outside, on the furnace wall of the direct steelmaking stove outside, has direct steelmaking stove tap hole (7).
Said direct steelmaking stove tap hole is the siphon tapping mouth.
Preferably, described direct steelmaking stove also comprises bottom blowing stirring gas gas permeable brick (8); Bottom blowing is stirred gas gas permeable brick (8) and is positioned at direct steelmaking stove furnace bottom.
Preferably, said feeding device (2) is selected from: use N
2Spray gun, screw feeder or charge hoisting by belt conveyer machine as carrier gas.
Use N
2The spray gun of doing carrier gas can use water cooled lance, also can use the spray gun of other form.Gas phase zone secondary combustion oxygen rifle (4) can use water cooled oxygen lance, also can use the spray gun of other form.
Preferably, direct steelmaking stove (5) comprises anti-material system, water-cooling system, off gas treatment and residual neat recovering system.
The present invention from the concrete operational path that iron ore directly obtains molten steel is: ferrous material (contain fine iron ore, contain iron ore, the iron content pellet, the powdered iron ore through fine grinding prereduction, iron scale, ion dust mud contaning one or more) and flux (comprising unslaked lime, rhombspar) are loaded in the direct steelmaking stove; Formed an iron bath in the direct steelmaking stove in advance; Or slag iron blended molten bath, temperature is more than 1400 ℃.Ferrous material and flux can use the charge hoisting by belt conveyer machine to add, and also can add with screw feeder, or use N
2The spray gun of doing carrier gas sprays into.The ferrous material that adds dissolves very soon and gets in the slag.Be blown into reducing gas to slag blanket, the reduction of this reducing gas contains the FeO slag, obtains carbon content less than 1.3% molten steel; The warm air that in the space of direct steelmaking slag layer top, is blown into oxygen or 500～1200 ℃ provides heat for the ferriferous oxide direct reduction reactors of a large amount of heat absorptions with the CO that the burning reduction reaction produces.Can also be blown into N from the bottom of direct steelmaking stove
2Agitation molten pool also can not be blown into end stirring N
2Molten steel directly flows out from the siphon port in the direct steelmaking stove.The high-temp waste gas of direct steelmaking stove can reclaim sensible heat with the waste heat boiler cooling and generate electricity.The present invention also comprises powdered iron ore carried out joining after the fine grinding preheating prereduction and carries out direct steelmaking in the direct steelmaking stove; Breeze and flux (refer in Wingdale, unslaked lime, the rhombspar one or more) mix and are finely ground to below 40 microns, in the Transport Bed equipment of special use with the heating by the exhaust gases prereduction behind the upgrading of direct steelmaking stove.
Advantage of the present invention is embodied in:
(1) technology of existing all production crude steel is followed from the operational path of ore or oxides-containing iron → molten iron or dri → molten steel, is the process of (also contain gangue in the dri, need the fusing refining) of decarburization after the first carburetting.Direct steelmaking technology of the present invention has only a stove, and is very compact, makes the STEELMAKING PRODUCTION flow process obtain simplification in essence.
(2) the present invention is through the reducing gas of being jetted in slag iron bath slag district, with the oxide compound reduction of iron.Owing to do not use coal and coke, and reducing gas only blows to the slag surface, and the molten steel carburizing of generation is few, need not decarburization when obtaining the finished product molten steel.
(3) dissolved oxygen activity is high because iron liquid carbon activity is low, and the Si in the gangue can not be reduced in the molten steel, need not to take off Si when obtaining the finished product molten steel, therefore can obtain molten steel from iron ore or one step of oxides-containing iron, does not have intermediates such as molten iron or dri.
(4) the present invention has realized producing molten steel from ore in a direct steelmaking stove, compares with existing steelmaking process, and equipment and initial cost are saved in a large number, and conservative calculating can be saved equipment and initial cost more than 50%; Logistics is fully simplified, and energy consumption per ton steel is low; In traditional steel factory, 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 has only a stove, and is very compact; Logistics is simply orderly, and has avoided the temperature loss of molten iron in transportation, is easy to realize directization of producing and control automatically; Be new generation of intelligent Iron And Steel Plant, behind employing the present invention, great change takes place in the looks of Iron And Steel Plant.
Description of drawings
Device letter of the present invention shows that schema sees accompanying drawing 1.The 1st, the fine ore Transport Bed, here fine ore is by preheating prereduction.The 2nd, feeding device.The 3rd, the reducing gas spray gun.The 4th, gas phase zone secondary combustion oxygen rifle.The 5th, the direct steelmaking stove.The 6th, direct steelmaking stove slag notch.The 7th, direct steelmaking stove tap hole.The 8th, the gas gas permeable brick is stirred in bottom blowing.
Embodiment
Following examples are to further specify of the present invention, but the present invention is not limited thereto.
Embodiment 1:
Direct steelmaking equipment of the present invention comprises: fine ore Transport Bed (1), feeding device (2), reducing gas spray gun (3), gas phase zone secondary combustion oxygen rifle (4), direct steelmaking stove (5), direct steelmaking stove slag notch (6), direct steelmaking stove tap hole (7); Direct steelmaking stove (5) is barrel-shaped stove, and the longitudinal section is as shown in Figure 1.Direct steelmaking stove (5) comprises anti-material system, water-cooling system, off gas treatment and residual neat recovering system.
Transport Bed equipment (1) is arranged above the direct steelmaking stove, and Transport Bed equipment (1) links to each other with direct steelmaking stove (5) through feeding device (2); Reducing gas spray gun (3) inserts the slag district; Gas phase zone secondary combustion oxygen rifle (4) is inserted into the gas-phase space of direct steelmaking stove top; Direct steelmaking stove slag notch (6) is positioned at furnace wall middle part, the direct steelmaking stove outside, on the furnace wall of the direct steelmaking stove outside, has direct steelmaking stove siphon tapping mouth (7).
Described direct steelmaking stove also comprises bottom blowing stirring gas gas permeable brick (8); Bottom blowing is stirred gas gas permeable brick (8) and is positioned at direct steelmaking stove furnace bottom.
Fine iron breeze and Wingdale, rhombspar are mixed, and their proportioning confirms that according to the composition of these several kinds of materials slag in smelting process and through material balance the basicity of generally getting slag is 1～1.5, Al
2O
35%～18%, MgO5%～10% is below the FeO10%.Obtain micro mist with the ball mill fine grinding less than 40 μ m, with this micro mist in Transport Bed 1 with the heating by the exhaust gases prereduction behind the upgrading of direct steelmaking stove, the temperature after this micro mist preheating is 300～600 ℃, the prereduction rate is 10～30%.
Fine iron breeze after the preheating prereduction is used N
2Be injected in the direct steelmaking stove during slag iron bathes through water cooled lance 2 as carrier gas; Formed a slag iron bath in advance in the direct steelmaking stove, thickness of slag layer is at about 10～1000mm, the about 10～2000mm of iron bath thickness; After the mixture of fine iron breeze and flux adds; Very fast dissolving gets in the slag (less than one fen clock time), is blown into Sweet natural gas, cracking generation hydrogen and carbon under the Sweet natural gas high temperature with natural gas spraying gun 3 to slag blanket simultaneously; Hydrogen and carbon reduction contain the FeO slag, obtain carbon content less than 1.3% molten steel.
Direct reduction reactor has produced a large amount of CO gas, in slag, forms foamy slag, has been full of the upper space of direct steelmaking stove simultaneously.Be blown into oxygen with water cooled oxygen lance 4 to the upper space of direct steelmaking stove, the CO so that the burning reduction reaction produces produces high-temp waste gas; The heat that secondary combustion produces passes to reaction zone with radiation and heat conducting mode.In slag iron is bathed,, behind the melt back pond that falls, be about to the secondary combustion heat and take back the molten bath because the slag iron that the material winding-up splashes drips the heat that has absorbed secondary combustion.
Physics heat is reclaimed in the cooling earlier of waste gas in the direct steelmaking stove 5, is used for generating, is used for the preheating prereduction of iron ore micro mist then.Direct steelmaking stove 5 has slag notch 6 and tap hole 7, and the molten steel of production and slag directly flow out respectively.Crude molten steel composition C0.1～0.8% that obtains, < 0.05%, < 0.04%, follow-up external refining and the deoxidation alloying operation of process can obtain qualified molten steel for S, P for Si, Mn.
Embodiment 2:
With fine iron breeze and part contain iron ore and Wingdale, rhombspar mixes, their proportioning confirms that according to the composition of these several kinds of materials slag in smelting process and through material balance the basicity of generally getting slag is 1～1.5, Al
2O
35%～18%, MgO5%～10% is below the FeO10%.Then mixture is packed in the direct steelmaking stove 5 through screw feeder 2.Leave the iron bath that thickness is 100～800mm in the direct steelmaking stove 5 in advance; Fine iron breeze and flux form the liquid form mixt slag blanket very soon; Be blown into coke-oven gas with coke-oven gas spray gun 3 to slag blanket simultaneously, the coke-oven gas reduction contains the FeO slag, obtains carbon content less than 1.3% molten steel.
At the upper space of direct steelmaking stove, reduction reaction has produced a large amount of CO, and with water cooled oxygen lance 4 oxygen blast, the CO secondary combustion is that the reduction reaction of thick slag blanket provides the part heat.In direct steelmaking stove 5, stir gas gas permeable brick 8 bottom blowing N through bottom blowing
2Agitation molten pool is for ferriferous oxide in the C reducing slag in the molten iron is created dynamic conditions.
Molten steel pours from the siphon tapping mouth, and the slag of generation pours through slag notch.Crude molten steel composition C0.15～0.7% that obtains, < 0.05%, < 0.04%, follow-up external refining and the deoxidation alloying operation of process can obtain qualified molten steel for S, P for Si, Mn.Waste gas in the direct steelmaking stove reclaims physics heat through cooling, is used for generating.
Powdered iron ore and Wingdale, the rhombspar that will pass through fine grinding prereduction mix, and their proportioning confirms that according to the composition of these several kinds of materials slag in smelting process and through material balance the basicity of generally getting slag is 1～1.5, Al
2O
35%～18%, MgO5%～10% is below the FeO10%.Other is with embodiment 2.
Embodiment 4
Iron content pellet and ion dust mud contaning and Wingdale, rhombspar mix, and their proportioning confirms that according to the composition of these several kinds of materials slag in smelting process and through material balance the basicity of generally getting slag is 1～1.5, Al
2O
35%～18%, MgO5%～10% is below the FeO10%.Then mixture is packed in the direct steelmaking stove 5 through feeding device 2.Leave the iron bath that thickness is 100～800mm in the direct steelmaking stove 5 in advance; Fine iron breeze and flux form the liquid form mixt slag blanket very soon; Be blown into the mixture of Sweet natural gas and coke-oven gas simultaneously to slag blanket with reducing gas spray gun 3; The reduction of the mixture of Sweet natural gas and coke-oven gas contains the FeO slag, obtains carbon content less than 1.3% molten steel.Other is with embodiment 2.
Claims (8)
1. a direct steelmaking equipment comprises: fine ore Transport Bed (1), feeding device (2), reducing gas spray gun (3), gas phase zone secondary combustion oxygen rifle (4), direct steelmaking stove (5), direct steelmaking stove slag notch (6), direct steelmaking stove tap hole (7);
Direct steelmaking stove (5) is barrel-shaped stove, comprises slag district and molten iron district; Transport Bed equipment (1) is arranged above the direct steelmaking stove, and Transport Bed equipment (1) links to each other with direct steelmaking stove (5) through feeding device (2); Reducing gas spray gun (3) inserts the slag district; Gas phase zone secondary combustion oxygen rifle (4) is inserted into the gas-phase space of direct steelmaking stove top; Direct steelmaking stove slag notch (6) is positioned at furnace wall middle part, the direct steelmaking stove outside, on the furnace wall of the direct steelmaking stove outside, has direct steelmaking stove tap hole (7).
2. a direct steelmaking equipment as claimed in claim 1 is characterized in that, described direct steelmaking stove also comprises bottom blowing stirring gas gas permeable brick (8); Bottom blowing is stirred gas gas permeable brick (8) and is positioned at direct steelmaking stove furnace bottom.
3. a direct steelmaking equipment as claimed in claim 1 is characterized in that, direct steelmaking stove (5) comprises anti-material system, water-cooling system, off gas treatment and residual neat recovering system.
4. a direct steelmaking equipment as claimed in claim 1 is characterized in that, said feeding device (2) is selected from: use N
2Spray gun, screw feeder or charge hoisting by belt conveyer machine as carrier gas.
5. a direct steelmaking technology of using each described direct steelmaking equipment of claim 1～4 comprises the following steps:
1) be pre-formed an iron bath in the direct steelmaking stove, or slag iron blended molten bath, temperature is more than 1400 ℃;
2) ferrous material and flux are loaded in the direct steelmaking stove, and the ferrous material of adding dissolves very soon and gets in the slag, is blown into reducing gas to slag blanket, and the reducing gas reduction contains the FeO slag, obtain carbon content less than 1.3% molten steel;
3) in the space of direct steelmaking slag layer top, be blown into the CO that the warm air of oxygen or 500～1200 ℃ produces with the burning reduction reaction; Produce high-temp waste gas;
4) molten steel and slag directly flow out from siphon tapping mouth and slag notch in the direct steelmaking stove;
Step 2) said ferrous material be selected from contain fine iron ore, contain iron ore, the iron content pellet, through in powdered iron ore, iron scale and/or the ion dust mud contaning of fine grinding prereduction one or more; Step 2) said flux is unslaked lime and rhombspar; Step 2) the said reducing gas mixture that is Sweet natural gas, coke-oven gas or Sweet natural gas and coke-oven gas.
6. a direct steelmaking technology as claimed in claim 5 is characterized in that step 2) said ferrous material and flux adds, adds or use N with screw feeder with the charge hoisting by belt conveyer machine
2The spray gun of doing carrier gas sprays into.
7. a direct steelmaking technology as claimed in claim 5 is characterized in that the bottom from the direct steelmaking stove in the step 3) is blown into N
2The molten bath is mixed in gas mixing.
8. direct steelmaking technology as claimed in claim 5; It is characterized in that; Powdered iron ore carried out joining after the fine grinding preheating prereduction carry out direct steelmaking in the direct steelmaking stove; Powdered iron ore and Wingdale mix and are finely ground to below 40 microns, in Transport Bed equipment with the heating by the exhaust gases prereduction behind the upgrading of direct steelmaking stove.
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| CN2008101400824A CN101684507B (en) | 2008-09-24 | 2008-09-24 | Direct steel making technique by reducing iron ore with gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101956035B (en) * | 2010-05-20 | 2012-05-23 | 莱芜美澳冶金科技有限公司 | Iron-containing material slag bath smelting reduction steelmaking technical method and device |
| KR101517124B1 (en) * | 2010-12-10 | 2015-05-04 | 다니엘리 앤드 씨. 오피시네 메카니케 쏘시에떼 퍼 아찌오니 | Apparatus for pre-heating a metal charge for a melting plant and connected method |
| CN109517934B (en) * | 2019-01-07 | 2021-02-23 | 山西赛思普科技有限公司 | Method for smelting pure metal by accurately controlling heat loss value |
| CN109517935A (en) * | 2019-01-07 | 2019-03-26 | 山西赛思普科技有限公司 | A kind of method and apparatus producing liquid clean metal |
| CN109628676B (en) * | 2019-01-07 | 2020-10-30 | 山西赛思普科技有限公司 | Short-process technology for directly producing pure molten iron |
| CN111850219A (en) * | 2020-08-26 | 2020-10-30 | 内蒙古赛思普科技有限公司 | Method for producing chalcogenide free-cutting steel by hydrogen-based melting reduction |
| CN113789420B (en) * | 2021-08-10 | 2022-05-31 | 赵晓 | Direct steelmaking device for iron-containing powder in reducing atmosphere and using method |
| CN113981164A (en) * | 2021-10-25 | 2022-01-28 | 山东大学 | Process and system for co-mechanical activation of iron ore-carbon material in reducing atmosphere |
| CN114737004B (en) * | 2022-04-15 | 2024-02-09 | 中钢设备有限公司 | Iron ore direct steelmaking system and iron ore direct steelmaking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071202A (en) * | 1991-10-03 | 1993-04-21 | 卡吉尔股份有限公司 | With iron carbide continuous production iron-carbon |
| CN1170440A (en) * | 1994-12-20 | 1998-01-14 | Usx有限公司 | Process and apparatus for manufacture of steel from iron carbide |
-
2008
- 2008-09-24 CN CN2008101400824A patent/CN101684507B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1071202A (en) * | 1991-10-03 | 1993-04-21 | 卡吉尔股份有限公司 | With iron carbide continuous production iron-carbon |
| CN1170440A (en) * | 1994-12-20 | 1998-01-14 | Usx有限公司 | Process and apparatus for manufacture of steel from iron carbide |
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