CN101956035B - Iron-containing material slag bath smelting reduction steelmaking technical method and device - Google Patents
Iron-containing material slag bath smelting reduction steelmaking technical method and device Download PDFInfo
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Abstract
The invention relates to slag bath smelting reduction continuous steelmaking technology for iron-containing material pelletized sintering equipment. In the technology, after a thick-slag layer molten bath is formed in a slag bath furnace, combined injection of carbon-containing materials, combustible gas, oxygen or oxygen-enriched air is implemented on the top and at the bottom of the molten slag, the carbon-containing materials or the combustible gas is combusted to form high-temperature molten slag, and residual carbon or combustible gas keeps the reducibility of the molten slag; the iron-containing materials are sintered into high-temperature oxidized pellets through pelletized sintering equipment and are added into the slag bath furnace through a high-temperature loading system to be molten and reduced; and molten steel continuously flows into an oxidation furnace without slag through a beta-shaped tap hole, a fluxing agent is added into the oxidation furnace for slagging desulfuration and dephosphorization, tamping oxygen and inserted oxygen lance blowing oxygen adjusts the C content and temperature of the molten steel so as to obtain the molten steel for direct supply to LF or RH refining furnaces. The slag bath smelting reduction continuous steelmaking technology has the advantages of high production efficiency, high thermal efficiency, long service life of the furnace, short flow, easy continuity and automatic control of production, equipment and capital investment conservation, land conservation, energy conservation and emission reduction.
Description
Technical field
The present invention relates to the production technique of steel, relate in particular to a kind of process method and device, belong to technical field of ferrous metallurgy with ferrous material slag bath molten reduction STEELMAKING PRODUCTION molten steel.
Background technology
Continuous 9 years the first in the world of China's iron and steel output hold a safe lead the world with more than 700,000,000 tons of production capacities at present, but the consequent energy, resource, blowdown presssure are huge.Along with the pay attention to day by day of international community to environmental protection; The shortage of resources such as iron ore, steel scrap, coke; Coking coal resource is particularly outstanding; People constantly seek a kind of ironmaking or method for making steel without coking coal; Like pellet sintering equipment, Itmk3 " third generation iron smelting method " Japanese kobe steel and U.S.'s Midland (Midrex) company develop jointly the direct reduction process of pellet sintering equipment (Fastmet), and MIDREX, HYL method and the coal that with the Sweet natural gas is reductive agent is the kiln process, shaft furnace process of reductive agent etc.Melting and reducing mainly is to produce molten iron-converter steelmaking flow process method with mill coal; Mainly contain COREX, FINEX, AUSIRON, HISMELT, DIOS, ROMELT, CCF, AISI, CLEANMELT etc.; Most of smelting reduction process also are in development; Have only the COREX iron-smelting process to build up 5 production lines, some factories such as item, South Africa, India moved more than 10 years at the Pu, especially the COREX-2000 in South Africa; COREX has realized the target that the ton coal is produced 2 tons of iron, on energy consumption, can compete with modern blast furnace ironmaking.HISMELT technology has been developed maturation, receives at Australian Kun Na and has built one 800,000 tons factory, trys out at present, and what SRV melting reduction furnace was produced is C content 4.2-4.5% molten iron, has problems such as investment is big, heat transfer efficiency is low.
CN02116882.2 discloses a kind of coal-iron ore microwave reduction and electric furnace steel-making method and apparatus, and this method production efficiency is low, is difficult to large-scale production; CN86105494 discloses brown coal pre-reduction of ore direct steelmaking stocking, is that ore is processed sponge iron earlier, again by Electric furnace steel making, rerolls into steel, and efficiency of energy utilization and production efficiency are low; CN200610040303.1 discloses the method with the induction furnace direct steelmaking, and energy consumption is high, production efficiency is low; CN200610040696.6 disclose mixture block with powdered iron ore and pulverized anthracite utilize converter direct steelmaking method and CN200610040838.9 disclose method that the compound with iron scale and pulverized anthracite utilizes electric furnace direct steel-making method and CN87101210 to disclose a kind of iron ore direct steelmaking be meant by iron ore concentrate, mill coal and solvent make without any reductive cold bound pellet; Be added to the method for making steel in the modern industry steel melting furnace; The reduction of iron ore efficient of these methods is low; Energy consumption is high, and production efficiency is low; CN92113519.X discloses the method and apparatus with the ore direct steelmaking; Be earlier ore to be reduced into sponge iron with reducing gas; Then with high-temperature sponge iron with the isolated situation of ambient atmosphere under send in the melting chamber and melt, add the method that slag former is removed harmful element again, energy consumption is high; Production efficiency is low, does not see the report of industrialization.
The serialization that CN86106417 blast furnace continuous steelmaking and system steel are produced proposes to improve blast furnace and makes the method that fuel and reductive agent directly are smelt steel with pure oxygen and pressure gasifying gas, does not see the report of industrialization.CN87104957.0 continuous steelmaking technique and equipment are established a kind of continuous steelmaking technique of forehearth, slot type furnace and back stove, raw materials usedly remain blast-melted, and efficient is low, and cost is high.At present long flow process blast furnace ironmaking adopts 1100 ℃～1250 ℃ high temperature oxidation pelletizings of equipment agglomerating such as belt type roasting machine or grate kiln need pass through the refrigerating work procedure link; Be as cold as room temperature and add blast furnace again; Heat-energy losses is huge, and the operation energy utilizes unreasonable.
Summary of the invention
Deficiency to prior art; The present invention makes full use of 1100 ℃～1250 ℃ ferrous materials such as high temperature oxidation pelletizing that existing pellet sintering equipment provides; Direct production goes out the molten steel that the confession refining furnace of C content 0.01%～0.50% is used, and a kind of brand-new process for making is provided.
The present invention proposes a kind of brand-new high temperature oxidation pelletizing slag bath molten reduction process for making that utilizes existing pellet sintering equipment to be provided.Slag liquid furnace, oxidized still and " second " shape iron mouth that overflows is baked to greater than after 1000 ℃, adds high temperature oxidation pelletizing, pre-melted slag and lump coal or coke, and injection coal oxygen makes the scum molten bath that in the slag liquid furnace, forms thick slag blanket; Implement slag top end composite blowing; It is carbon-oxygen gun implements to be rich in carbon/oxygen winding-up from carbon material powder to the slag bottom; Coal gas oxygen rifle is implemented the combustible gas/oxygen winding-up of rich combustible gas to slag top; Carbon/oxygen burning and coal gas/oxygen incendiary heat are formed the high-temperature slag district by the slag efficient absorption on slag top, and carbon dust more than needed and combustible gas more than needed keep the high reductibility of slag; Proportion adds the slag liquid furnace less than the high temperature oxidation pelletizing of slag and swims in the high-temperature slag district and be fused into the liquid iron oxide compound fast, and the liquid iron oxide compound is contained the slag fast restore of high temperature carbon dust with a large amount of CO and obtains low-carbon (LC) (C:1.5-3.0%) molten iron; Low-carbon (LC) molten iron in the molten bath flows into oxidized still through the excessive iron mouth of " second " shape, and the qualified molten steel that C content 0.01%～0.50% is produced in oxidized still adding sludging flux and oxygen blast supplies refining furnace.
The present invention provides a kind of slag bath molten reduction process for making, comprises the steps:
1) during new blow-on; Require to be baked to 1000-1100 ℃ to the excessive iron mouth of slag liquid furnace, oxidized still and " second " shape according to roast technic; Add high temperature oxidation pelletizing, pre-melted slag and lump coal or coke; Winding-up carbon oxygen, make the scum molten bath that in the slag liquid furnace, forms the thick 700-800mm of molten iron, the thick 600-700mm of slag after, promptly get into normal the smelting; Only increase temperature acid pellet and flux after getting into normal the smelting;
2) get into the normal back that smelts and implement slag top end composite blowing; Be that carbon-oxygen gun implements to be rich in carbon material powder/oxygen winding-up to the slag bottom apart from 300-200mm place, scum interface; The high temperature that carbonaceous material and oxygen reaction produce is by the slag efficient absorption; The CO that produces rises and stirs slag, and carbon more than needed keeps the reductibility of slag; Coal gas oxygen rifle is implemented rich combustible gas/oxygen winding-up to the slag top apart from top of the slag 260-200mm place, combustible gas and oxygen burning form 1500 ℃～1600 ℃ high-temperature slag district, and the strong agitation top of the slag, and combustible gas more than needed keeps the reductibility of slag; The burning rifle is blown into 1200～1300 ℃ oxygen-rich air or oxygen to the space of molten slag layer top, with CO, the H of slag liquid furnace generation
2Deng burning, the high temperature of generation reaches the cinder high-temperature district;
3) ferrous material is utilized the high temperature oxidation pelletizing of the proportion of pellet sintering device fabrication for 1.8-2.2; Join the high-temperature slag district that slag liquid furnace proportion is 2.5-3; The high temperature oxidation pelletizing that swims in the high-temperature slag district is melted fast forms the liquid iron oxide compound; In the slag that contains high temperature carbonaceous material and a large amount of CO, be reduced very soon in the liquid iron oxide compound decline process and obtain the low-carbon (LC) molten iron, Low Carbon Iron is landed into the molten bath under water; Said low-carbon (LC) molten iron is the molten iron of C content 1.5-3.0wt%;
4) when step 3) is carried out, add the flux slag making to the slag liquid furnace, to desulfurizing iron, dephosphorization, basicity of slag is controlled in 1.1～1.3 scopes;
5) the molten bath molten iron continuously flows into oxidized still through the excessive iron mouth of " second " shape; In oxidized still, add flux slag making desulfurization, dephosphorization; Basicity of slag is controlled in 3.0～3.5 scopes; Further adjust C content and temperature in the molten steel through oxidized still BOTTOM OXYGEN gas permeable brick and top blow oxygen lance oxygen blast,, directly supply LF or RH refining furnace to obtain the qualified molten steel of 1550 ℃～1700 ℃ of C content 0.01～0.50%, temperature;
6) the oxidized still tap hole is positioned at oxidized still apart from furnace bottom 100-150mm place; The oxidized still slag notch is positioned at 300-350mm place, oxidized still tap hole top; After oxidized still fills with molten steel and accomplishes the oxygen blast smelting operation, close the excessive iron mouth sealed wall of " second " shape that this oxidized still links to each other; Or the slag liquid furnace opens the oxidized still tap hole and implements slag free tapping when implementing out slag operation, and the slag above the molten steel plays the provide protection to the stove inwall with on the stove inwall of oxidized still, hanging up one deck slag in the molten steel decline process; Stop tapping when molten steel drops to the following time sealing tap hole of oxidized still slag notch, open slag notch and begin to slag tap, accomplish the rear enclosed slag notch of slagging tap, open " second " shape iron mouth sealed wall that overflows and implement next stove oxygen blast smelting operation.
Preferably; The coal gas of high temperature (being step 2) that the slag liquid furnace produces generates 600-800 ℃ high-quality upgrading coal gas behind coal gas upgrading stove, be used for the fuel of pellet sintering equipment, or is used for the inflammable gas to the slag winding-up of slag liquid furnace; Or be used for heater for rolling steel fuel, or be used for generating electricity etc.
Said coal gas upgrading stove is formed the coal gas of high temperature of slag liquid furnace (1450-1550 ℃) and oxidized still coal gas of high temperature (1500-1650 ℃) through coke in the coal gas upgrading stove or coal (diameter 3-20mm) modification agent, the heat that makes full use of coal gas of high temperature makes the CO in the coal gas
2Become CO, water vapor and C reaction to generate H with the carbon reaction conversion
2And CO, generate 600-800 ℃ high-quality coal gas then.
Described basicity of slag, production scene adopt dual alkalinity installation, i.e. CaO/SiO more
2Ratio.
The described pre-melted slag of step 1) is meant the clinker material that is cooled to blast furnace slag.Blast furnace slag is a kind of waste residue of from blast furnace, discharging when smelting the pig iron.When the blast-furnace smelting pig iron, the raw material from blast furnace adds except iron ore and fuel (coke), also will add fusing assistant.When furnace temperature reached 1400～1600 ℃, fusing assistant and iron ore generation pyroreaction generated the pig iron and slag.Blast-furnace slag can not be got into by gangue, ash content, fusing assistant and other that impurity in pig iron forms, and is a kind of meltable mixture.The blast furnace slag that pre-melted slag of the present invention can adopt any iron-smelting blast furnace to produce is cooled to the piece material.
The ratio of high temperature oxidation pelletizing, pre-melted slag and lump coal or coke is the high temperature oxidation pelletizing during new blow-on in the step 1): pre-melted slag: lump coal or coke=and 6: 2: 2, weight ratio.
Sinter thickness was 600mm～2000mm when preferably, the slag liquid furnace was normally smelted in the step 1).
Step 2) describedly is rich in carbon material winding-up and is meant that the carbonaceous material that sprays into is than more than needed to some extent with the needed carbonaceous material total amount of oxygen complete reaction; Rich combustible gas winding-up is meant that the combustible gas that sprays into is than more than needed to some extent with the needed combustible gas total amount of oxygen complete reaction.
Preferably, step 2) said carbonaceous material is one or more in coal dust, coke powder, Sweet natural gas, combustible ice, coke-oven gas, generation coal gas or the upgrading coal gas etc.; Combustible gas is meant one or more in Sweet natural gas, combustible ice, coke-oven gas, generation coal gas or the upgrading coal gas; Combustible gas and oxygen spray into the slag liquid furnace after all can being preheating to high temperature (500-1250 ℃).Combustible ice is gas hydrate, is under certain condition (salinity of suitable temperature, pressure, gas saturation, water, pH value etc.), by the white solid state crystalline material that forms in gas or volatile liquid and the water mutual effect process, and outward appearance picture ice.
Preferably, step 2) carbon-oxygen gun is removable in, and the heart portion pipeline of carbon-oxygen gun is that oxygen, external pipe are carbonaceous materials, or oxygen channel and carbonaceous material pipeline are arranged side by side.To apart from 300-200mm place, scum interface, burning carbonaceous materials provides institute's heat requirement to the slag liquid furnace to carbon-oxygen gun by the downward oblique cutting of furnace sidewall, the control COR, reduces slag and in molten iron, increases C in a large number.Preferably, be rich in the winding-up of carbon material, by rich carbon 3-50wt% control COR.
According to the size of stove and smeltings needs, carbon-oxygen gun can be 2 to 12, is arranged in suitable position around the furnace wall, sufficient physics and chemical kinetics condition is provided and melts heat for ferrous material and flux melt fast.Those skilled in the art can select the quantity and the position of carbon-oxygen gun according to actual needs.Preferably, carbon-oxygen gun becomes the α angle with slag liquid furnace sidewall, and the α angle is 35～65 degree angles.
Preferably, step 2) said coal gas oxygen rifle is removable, and the heart portion pipeline of coal gas oxygen rifle is that oxygen, external pipe are coal gas, or oxygen channel and gas line are arranged side by side.Preferably, combustible gas that rich combustible gas/oxygen sprays into and oxygen burning provide heat for slag, and combustible gas 5-50wt% more than needed, keep the reductibility of slag.According to the size and smelting needs of stove, coal gas oxygen rifle can be 2 to 8, is arranged in suitable position around the furnace wall, and those skilled in the art can select the quantity and the position of coal gas oxygen rifle according to actual needs.Preferably, coal gas oxygen rifle becomes the β angle with slag liquid furnace sidewall, and the β angle is 50～75 degree angles, along with the variation coal gas oxygen rifle of sinter thickness can insert, proposition or translation-angle;
Preferably; Step 2) can establish the burning rifle in the furnace gas of slag liquid furnace top; Said burning rifle is removable; The heat that the burning rifle sprays into oxygen and burning generations such as the CO in the furnace gas, H2 in 1200-1300 ℃ the oxygen-rich air passes to top of the slag formation high-temperature slag, the oxygen level 30-80wt% of oxygen-rich air.According to the size and smelting needs of stove, the burning rifle can be 2 to 8, is arranged in suitable position around the furnace wall, and those skilled in the art are the quantity and the position of selective combustion rifle according to actual needs.Preferably, the burning rifle becomes the γ angle with slag liquid furnace sidewall, and the γ angle is 45～60 degree angles, along with the variation of sinter thickness burns that rifle can insert, proposition or translation-angle;
Preferably, the temperature of the described high temperature oxidation pelletizing of step 1) and step 3) is 1100 ℃～1250 ℃.
Preferably, the described high-temperature slag of step 3) district is sufficient by vigorous agitation and reacting dynamics condition.
Preferably, the said ferrous material of step 3) is selected from iron-stone, jacobsite, contains in ore, iron scale, iron dust containing and/or the ion dust mud contaning that josephinite etc. contains ferrous metal one or more;
Preferably, the said pellet sintering equipment of step 3) is to remove improved belt type roasting machine of cooling section or grate kiln, or other pellet sintering equipment, and the high temperature oxidation pelletizing of being produced (1100 ℃～1250 ℃) directly adds the slag liquid furnace without cooling.
Preferably, step 4) and 5) said flux is one or more in unslaked lime, rhombspar, the fluorite etc., and flux adds in the slag liquid furnace by a ton molten iron 120-150 kilogram through the high temperature charging system in the step 4); Flux is by in 30～80 kilograms of adding oxidized stills of molten steel per ton in the step 5).
Preferably, the excessive iron mouth of " second " shape top is provided with the excessive iron mouth gas exit of " second " shape in the step 5), and the partial oxidation furnace coal gas of high temperature is emitted thus, and the high temperature of coal gas plays heat effect to the excessive iron mouth of " second " shape simultaneously; The excessive iron mouth of " second " shape also is provided with the excessive iron mouth sealed wall of " second " shape, and sealed wall is movably, can close the excessive iron mouth of " second " shape according to the needs of oxidized still operation, stops molten iron inflow oxidized still.
Preferably; Oxidized still links to each other with the slag liquid furnace through the excessive iron mouth of " second " shape in the step 5); Be provided with changeable type oxygen rifle at the oxidation furnace roof, the bottom is provided with the BOTTOM OXYGEN gas permeable brick; Can further fall C operation to molten steel,, directly supply RH or LF refining furnace to obtain required C content (C:0.01～0.50%) and to require the molten steel of temperature (1550～1700 ℃).
Preferably, the coal gas take-off equipment of oxidized still links to each other with the coal gas take-off equipment of slag liquid furnace, reaches pressure equilibrium.
The present invention also provides a kind of slag bath molten reduction steel-making device, comprises slag liquid furnace (9) and oxidized still (22); Slag liquid furnace (9) links to each other through the excessive iron mouth (18) of " second " shape with oxidized still (22), realizes that no slag taps a blast furnace; Slag liquid furnace (9) top is provided with burning rifle (11); Slag liquid furnace (9) furnace wall is provided with coal gas oxygen rifle (12) and carbon-oxygen gun (13), and slag liquid furnace middle part is provided with slag liquid furnace slag notch (14), slag liquid furnace bottom is provided with and puts steel mouth (15), the excessive iron mouth (18) of " second " shape, slag liquid furnace coal gas delivery port (8); Oxidized still (22) is provided with oxidized still oxygen rifle (23), oxidized still string jar string jar flux and adds system (24), oxidized still slag notch (26), oxidized still tap hole (27), oxidized still bottom and put steel mouth (28), oxidized still coal gas delivery port (21).
Preferably, described slag bath molten reduction steel-making device also comprises pellet sintering equipment (1) and coal gas upgrading stove (35), and pellet sintering equipment (1) links to each other through the high temperature charging system with slag liquid furnace (9); Slag liquid furnace coal gas delivery port (8) converges after cyclone dust removal (33) is connected with the coal gas reforming system with oxidized still coal gas delivery port (21) pipeline mutually.
Said pellet sintering equipment is improved belt type roasting machine, the grate kiln that directly goes out high temperature (1100 ℃～1250 ℃) pelletizing, or other pellet sintering equipment.
Preferably, the high temperature charging system links to each other with the blow tank (2) of pellet sintering equipment (1), comprises feed bin (3), track (4), skip car (5), tandem tank type distributor (7) successively; Tandem tank type distributor (7) links to each other with slag liquid furnace bell (10), and tandem tank type distributor (7) top is provided with solvent feed bin (6); Skip car (5) runs on the track (4).
The heart portion pipeline of carbon-oxygen gun is that oxygen, external pipe are carbonaceous materials, or oxygen channel and carbonaceous material pipeline are arranged side by side.To apart from 300-200mm place, scum interface, burning carbonaceous materials provides institute's heat requirement to the slag liquid furnace to carbon-oxygen gun by the downward oblique cutting of furnace sidewall, the control COR, reduces slag and in molten iron, increases C in a large number.
According to the size of stove and smeltings needs, carbon-oxygen gun can be 2 to 12, is arranged in suitable position around the furnace wall, sufficient physics and chemical kinetics condition is provided and melts heat for ferrous material and flux melt fast.Those skilled in the art can select the quantity and the position of carbon-oxygen gun according to actual needs.Preferably, carbon-oxygen gun becomes the α angle with slag liquid furnace sidewall, and the α angle is 35～65 degree angles.
The heart portion pipeline of coal gas oxygen rifle is that oxygen, external pipe are coal gas, or oxygen channel and gas line are arranged side by side.Preferably, combustible gas that rich combustible gas/oxygen sprays into and oxygen burning provide heat for slag.According to the size and smelting needs of stove, coal gas oxygen rifle can be 2 to 8, is arranged in suitable position around the furnace wall, and those skilled in the art can select the quantity and the position of coal gas oxygen rifle according to actual needs.Preferably, coal gas oxygen rifle becomes the β angle with slag liquid furnace sidewall, and the β angle is 50～75 degree angles, along with the variation coal gas oxygen rifle of sinter thickness can insert, proposition or translation-angle;
Said burning rifle is removable, and according to the size and the smelting needs of stove, the burning rifle can be 2 to 8, is arranged in suitable position around the furnace wall, and those skilled in the art are the quantity and the position of selective combustion rifle according to actual needs.Preferably, the burning rifle becomes the γ angle with slag liquid furnace sidewall, and the γ angle is 45～60 degree angles, along with the variation of sinter thickness burns that rifle can insert, proposition or translation-angle.
Preferably; The coal gas reforming system links to each other with oxidized still coal gas delivery port (21) with slag liquid furnace coal gas delivery port (8) through coal gas of high temperature pipeline (32), comprises coal gas of high temperature pipeline (32), cyclone dust removal (33), dust outlet (34), gas exit (35), coal gas upgrading stove (36), upgrading coal gas output channel (37) successively;
Preferably, slag liquid furnace (9) is the cylindrical stove that molten bath district diameter is little, slag district diameter is big, and oxidized still (22) is cylindrical stove; Be equipped with in the bottom of slag liquid furnace and oxidized still bottom that the slag liquid furnace is put steel mouth (16) and oxidized still is put steel mouth (28), use during the confession overhaul;
Preferably, slag liquid furnace slag notch (15) is positioned at above 600-800mm place, slag liquid furnace scum interface, with the minimum thickness that keeps slag in the slag liquid furnace greater than 600mm;
Preferably, the excessive iron mouth (18) of " second " shape is provided with excessive iron mouth gas exit (38) of " second " shape and the excessive iron mouth sealed wall (39) of " second " shape;
Preferably, a slag liquid furnace (9) can be established two " second " shapes iron mouth (18) that overflows and links to each other with two oxidized stills (22) respectively; Can close certain " second " shape iron mouth (18) that overflows through " second " shape iron mouth sealed wall (39) that overflows, stop molten iron to flow into this oxidized still, be convenient to this oxidized still (22) and tap or go out slag operation; Two oxidized stills (22) but operate alternately.As shown in Figure 3.
Preferably, the shell of the excessive iron mouth (18) of the shell of molten bath, the bottom part of slag liquid furnace (9) and oxidized still (22) and " second " shape all adopts the water cooled furnace wall structure, and furnace campaign can be reached more than 20 years;
Preferably, oxidized still (22) bottom is provided with BOTTOM OXYGEN gas permeable brick (31), and molten steel is carried out continuously weak oxygen blast, makes the stable C that takes off of molten steel, shortens the strong oxygen blow duration of oxidized still oxygen rifle (23), prevents that big boiling, splash etc. from appearring in molten steel, improves liquid steel temperature.Oxidized still BOTTOM OXYGEN gas permeable brick can be established 1～7 according to the size of oxidized still, and the installation site is optimized design.Oxidized still (22) top is provided with oxygen rifle (23) blowing molten steel, makes the temperature of C content and molten steel in the steel reach the requirement of RH or LF refining furnace; Oxidized still string jar string jar flux adds system (24) and adds sludging flux for oxidized still; Oxidized still tap hole (27) is positioned at oxidized still (22) apart from furnace bottom 100-200mm place, and oxidized still slag notch (26) is positioned at 300-400mm place, oxidized still tap hole (27) top.
Advantage of the present invention is embodied in:
(1) without coke, the slag liquid furnace is realized slag top end composite blowing, and the slag bottom sprays into the carbonaceous material powder and oxygen, slag top spray into slag liquid furnace self produced gas and oxygen, and carbon/oxygen, combustible gas/oxygen combustion heat are by the slag efficient absorption, and thermo-efficiency is high; Utilize self produced gas to return and be sprayed onto in the slag, reduced comprehensive energy consumption, effects of energy saving and emission reduction is remarkable.
(2) 1100～1250 ℃ of high temperature oxidation pelletizings are fused into the liquid iron oxide compound fast and by fast restores such as the pyrocarbon in the slag, CO, obtain the low-carbon (LC) molten iron of C content 1.5%～3.0% in slag.Productivity of the present invention is high, and UTILIZATION OF VESIDUAL HEAT IN efficient is high, and this point is superior to existing blast furnace-bof process, COREX fused reduction iron-smelting-bof process, and the Hismelt-bof process also is superior to some patents simultaneously and proposes a continuous steelmaking or a step method for making steel.
(3) the present invention realizes that the slag liquid furnace does not have slag continuously and taps a blast furnace to oxidized still, goes out C content (C:0.01～0.50%) and the qualified molten steel of temperature (1550～1700 ℃) in the oxidized still direct production, has realized continuous steelmaking, the oxidized still slag free tapping.
(4) the present invention has realized from qualified molten steel of ferrous material direct production such as ores that with the continuous steelmaking equipment of compact pellet sintering equipment, slag liquid furnace, oxidized still, coal gas upgrading stove composition compare with existing long flow process, equipment and initial cost are saved more than 60%; Practice thrift the soil more than 2/3; Logistics is fully simplified, and is energy-conservation more than 25%, reduces discharging about more than 50%; Be easy to realize the serialization of producing and control automatically that furnace campaign was more than 20 years; Corresponding 6 (or 3) the slag bath molten reduction steel melting furnaces of the belt type roasting machine of 3 5,000,000 tons of scales or grate kiln can realize producing per year 1,000 ten thousand tons of steel, are revolutionary technological changes of ferrous metallurgy.
Description of drawings
Fig. 1 is a block diagram of the present invention.Wherein: 1: pellet sintering equipment, 2: blow tank, 3: go out feed bin, 4: track, 5: skip car; 6: solvent feed bin, 7: tandem tank type distributor, 8: coal gas take-off equipment, 9: the slag liquid furnace; 10: slag liquid furnace bell, 11: burning rifle, 12: coal gas oxygen rifle, 13: carbon-oxygen gun; 14: slag liquid furnace slag notch, 15: the steel mouth is put, 16 in slag liquid furnace bottom: slag liquid furnace water cooled furnace wall, 17: slag liquid furnace refractory materials furnace wall; 18: the second shape iron mouth that overflows, 19: the second shape iron mouth refractory wall that overflows, 20: the second shape iron saliva black furnace wall that overflows, 21: the oxidized still gas exit; 22: oxidized still, 23: oxidized still oxygen rifle, 24: oxidized still string jar string jar flux adds system, 25: the oxidized still bell; 26: the oxidized still slag notch, 27: the oxidized still tap hole, 28: the steel mouth is put in the oxidized still bottom; 29: oxidized still water cooled furnace wall, 30: oxidized still refractory materials furnace wall, 31: oxidized still BOTTOM OXYGEN gas permeable brick; 32: coal gas of high temperature pipeline, 33: cyclone dust removal, 34: dust outlet, 35 gas exits, 36: coal gas upgrading stove, 37: upgrading coal gas delivery port.38: " second " shape iron mouth gas exit that overflows, 39: " second " shape iron mouth sealed wall that overflows.
Fig. 2 is the another embodiment of the present invention block diagram.
Fig. 3 is the block diagram of the embodiment of the invention 5.
Embodiment
Following examples are to further specify of the present invention, but the present invention is not limited thereto.
The present invention from the concrete operational path of ferrous material continuous production molten steel such as iron ore is: during blow-on newly; Require to be baked to 1000-1100 ℃ to the excessive iron mouth of slag liquid furnace, oxidized still and " second " shape according to roast technic; Add high temperature oxidation pelletizing (1100 ℃～1250 ℃), pre-melted slag and lump coal or coke; Injection coal oxygen makes the scum molten bath that in the slag liquid furnace, forms the thick 700-800mm of molten iron, the thick 600-700mm of slag; Implement slag top end composite blowing; Be that the slag bottom sprays into carbonaceous material and oxygen, slag top spray into inflammable gas and oxygen; Carbon/oxygen, combustible gas/oxygen incendiary heat are by the slag efficient absorption; And the strong agitation top of the slag forms the high-temperature slag district, the high reductibility of carbonaceous material more than needed and CO more than needed maintenance slag; High temperature oxidation pelletizing and flux are added into the slag liquid furnace; Swim in the high-temperature slag district and be fused into the liquid iron oxide compound fast; The liquid iron oxide compound descends and is become molten iron to fall into the molten bath by fast restores such as the high temperature carbonaceous material in the slag, CO, obtains the molten steel of carbon content 1.5%～3.0%.Molten iron does not have slag continuously through the excessive iron mouth of " second " shape and flow into oxidized still; Add an amount of slag former to oxidized still and play the effect of desulfurization phosphorus simultaneously; Oxygen blast is taken off C and is promoted liquid steel temperature simultaneously; To obtain the molten steel of required C content (C:0.01～0.50%) and the temperature that required (1550 ℃～1700 ℃), directly supply refining furnace.The coal gas of high temperature of slag liquid furnace and oxidized still generates 600-800 ℃ high-quality coal gas behind coal gas upgrading stove, be used for the fuel of pellet sintering equipment, or is used for the slag winding-up coal gas to the slag liquid furnace, or is used for heater for rolling steel fuel, or is used for generating electricity.The slag of slag liquid furnace and oxidized still is used for producing cement, building materials, builds the road etc.
Embodiment 1:
Ferrous material: powdered iron ore; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: grate kiln.
Continuous steelmaking equipment of the present invention; Comprise: grate kiln (pellet sintering equipment) 1, slag liquid furnace 9, oxidized still 22 and coal gas upgrading stove 36; Slag liquid furnace 9 links to each other through the excessive iron mouth 18 of second shape with oxidized still 22; Grate kiln (pellet sintering equipment) 1 links to each other with slag liquid furnace 9 through the high temperature charging system, and coal gas upgrading stove 36 links to each other with oxidized still coal gas delivery port 21 with slag liquid furnace coal gas delivery port 8 through coal gas of high temperature pipeline 32; Slag liquid furnace 9 tops are provided with slag liquid furnace bell 10, burning rifle 11, coal gas oxygen rifle 12, carbon-oxygen gun 14, and slag liquid furnace bottom is provided with slag liquid furnace slag notch 15, steel mouth 16, slag liquid furnace water cooled furnace wall 17, slag liquid furnace refractory materials furnace wall 18 are put in slag liquid furnace bottom; " second " shape iron mouth 18, second shape iron mouth refractory wall 19, second shape iron mouth water wall 20 that overflows that overflows that overflows; Oxidized still 22 is provided with oxidized still oxygen rifle 23, oxidized still string jar string jar flux and adds system 24, oxidized still bell 25, oxidized still slag notch 26, oxidized still tap hole 27, oxidized still bottom and put steel mouth 28, oxidized still refractory materials furnace wall 29, oxidized still water cooled furnace wall 30 and oxidized still BOTTOM OXYGEN gas permeable brick 31; The excessive iron mouth 18 of second shape is provided with excessive iron mouth gas exit 38 of second shape and the excessive iron mouth sealed wall 39 of second shape.
Grate kiln (pellet sintering equipment) 1, blow tank 2, go out feed bin 3, track 4, skip car 5, tandem tank type distributor 7 and be connected to form the high temperature charging system successively, tandem tank type distributor 7 tops are provided with flux storehouse 6.
Coal gas of high temperature pipeline 32, cyclone dust removal 33, dust outlet 34, gas exit 35, coal gas upgrading stove 36, upgrading coal gas output channel 38 is connected to form the coal gas reforming system successively.
Pellet sintering equipment 1 successively through blow tank 2, go out the string jar distributor 7 that high temperature oxidation pelletizing, pre-melted slag, lump coal and unslaked lime that feed bin 3, track 4, skip car 5, flux storehouse 6 provide pellet sintering equipment, rhombspar, fluorite etc. are transported to slag liquid furnace 9 tops; Require to be baked to 1000-1100 ℃ to the excessive iron mouth of slag liquid furnace, oxidized still and " second " shape according to roast technic during blow-on newly; High temperature oxidation pelletizing, pre-melted slag, lump coal add the slag liquid furnace according to the ratio of 6: 2: 2 weight ratios; Winding-up carbonaceous material powder and oxygen; Promptly get into normal the smelting after treating in the slag liquid furnace to form the scum molten bath of the thick 700-800mm of molten iron, the thick 600-700mm of slag, only increase temperature acid pellet and flux after getting into normal the smelting; Flux: unslaked lime, rhombspar, fluorite join on the slag liquid furnace top of the slag in ratio, the ton molten iron 120 kg of 10: 9: 1 weight ratios, and slag liquid furnace slag basicity is controlled at 1.10-1.12; Slag liquid furnace top is provided with 4 carbon-oxygen guns 13 and becomes 50 degree angles with the furnace wall, sprays coal dust and oxygen simultaneously in the slag of iron circle top of the slag 300-200mm; 3 coal gas oxygen rifles 12 become 50 degree angles with slag liquid furnace sidewall, and burning forms the cinder high-temperature district apart from top of the slag 260-200mm place to spray into slag top to high temperature upgrading coal gas and oxygen simultaneously; 2 burning rifles 11 become 55 degree angles with slag liquid furnace sidewall, spray into CO, H in the slag top burning furnace gas to 1200 ℃ of oxygen enrichment 10wt% air
2Deng, the fusing of passing to heat top of the slag promote the oxidation pelletizing and flux; When slag liquid furnace slag reaches 1600-2000mm when thick; The coal oxygen of adjustment carbon-oxygen gun 13 makes the rich gas amount reach 45-55V% than the coal gas oxygen ratio that makes rich coal amount reach 40-45wt% and coal gas oxygen rifle 12; Make when FeO content is less than 0.05wt% in the slag and slag tap by slag notch 15; Stop to slag tap when thick when slag reaches 600-800mm, get into normally and smelt; The second shape of slag liquid furnace bottom is overflow the no slag continuous tapping of iron mouth 19 assurances to oxidized still 22; Adding system 24 through string jar flux is that oxidized still adding unslaked lime, rhombspar, fluorite further remove the sulphur phosphorus in the molten steel by the ratio of 30 kilograms of ton steel and 23: 5: 2, and the oxidized still slag basicity is controlled at 3.3-3.5; The 31 continuous oxygen blast of oxidized still BOTTOM OXYGEN gas permeable brick are to molten steel decarburization, and the oxygen rifle 23 blowing molten steel of oxidized still top make the temperature of C content (0.01～0.50%) and molten steel in the steel reach the requirement of RH or LF refining furnace; After oxidized still (22) fills with molten steel and accomplishes the oxygen blast smelting operation; Close the excessive iron mouth sealed wall (39) of second shape that this oxidized still (22) links to each other; Open oxidized still tap hole (27) and implement slag free tapping; Slag above the molten steel plays the provide protection to the stove inwall with on the stove inwall of oxidized still (22), hanging up one deck slag in the molten steel decline process; Stop tapping when molten steel drops to the following time sealing tap hole of oxidized still slag notch (26), open slag notch and begin to slag tap, accomplish the rear enclosed slag notch of slagging tap, open the second shape iron mouth sealed wall (39) that overflows and implement next stove oxygen blast smelting operation.The excessive iron mouth of second shape top is provided with the excessive iron mouth gas exit of second shape, and the partial oxidation furnace coal gas of high temperature is emitted thus, and the high temperature of coal gas plays heat effect to the excessive iron mouth of second shape simultaneously.
Slag liquid furnace molten iron (carbon content 1.5%～3.0%, phosphorus content＜0.015%, sulphur content＜0.06%, Si＜0.01%) flows in the oxidized still; Add flux to the interior slag making desulfurization of oxidized still, dephosphorization by 30～80 kilograms of steel per ton; Basicity of slag is controlled in 3.0～3.5 scopes, makes the C content of molten steel and the requirement that temperature reaches RH or LF refining furnace respectively through oxygen blast, obtains molten steel composition C 0.01～0.40%; Si＜0.01%; Mn＜0.02%, S, P＜0.010%, liquid steel temperature are 1550～1700 ℃.
The coal gas of high temperature of slag liquid furnace and oxidized still generates 600-800 ℃ high-quality coal gas behind coal gas upgrading stove, be used for the fuel of pellet sintering equipment, or is used for the slag winding-up coal gas to the slag liquid furnace, or is used for heater for rolling steel fuel, or is used for generating electricity.The slag of slag liquid furnace and oxidized still is used for producing cement, building materials, builds the road etc.The longitudinal section is as shown in Figure 1.
Embodiment 2:
Ferrous material: powdered iron ore; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: belt type roasting machine.Present embodiment does not adopt burning rifle 11, can obtain the high-quality coal gas of high temperature.Other is with embodiment 1.
Embodiment 3:
Ferrous material: powdered iron ore 70%, iron containing metallurgical dust 30%; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: belt type roasting machine.
The iron containing metallurgical dust is formed: iron scale, blast furnace dedusting ash, converter dust-removing ash, electric stove dust are grey, agglomerates of sintered pellets dedusting ash etc.
Powdered iron ore 70%, iron containing metallurgical dust 30% raw material behind pellet sintering equipment sintering and flux add the slag liquid furnace together.Unslaked lime, rhombspar, fluorite join on the slag liquid furnace top of the slag for 140 kilograms in ratio, the ton molten iron of 10: 9: 1 weight ratios, and slag liquid furnace slag basicity is controlled at 1.26-1.28; Burning rifle 11 becomes 50 degree angles with slag liquid furnace sidewall, and coal gas oxygen rifle 12 becomes 50 degree angles with slag liquid furnace sidewall, and slag liquid furnace carbon-oxygen gun 13 becomes 60 degree angles with sidewall; The two side, top of slag liquid furnace is provided with in the furnace gas that 3 burning rifles 11 are inserted into slag liquid furnace top, sprays into 1200-1300 ℃ of oxygen-rich air or oxygen, CO, H in the burning furnace gas
2The high temperature that produces Deng inflammable gas reaches the top of the slag, quickens the fusing of top of the slag acid pellet and flux.Other is with embodiment 1.
Embodiment 4:
Ferrous material: powdered iron ore 30%, iron containing metallurgical dust 70%; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: rotary hearth furnace.
High temperature pre-reduced pellet (degree of metalization 30-70%) and flux add the slag liquid furnace together.Unslaked lime, rhombspar, fluorite join on the slag liquid furnace top of the slag for 130 kilograms in ratio, the ton molten iron of 10: 9: 1 weight ratios, and slag liquid furnace slag basicity is controlled at 1.18-1.20;
What 4 carbon-oxygen guns 13 sprayed into is Sweet natural gas and oxygen; What 4 coal gas oxygen rifles 12 sprayed into is Sweet natural gas and oxygen; And keep 15% rich natural gas to keep the reductibility of slag; 3-5 props up burning rifle 11 and is inserted in the furnace gas of slag liquid furnace top, sprays into the oxygen of 1200 ℃ of oxygen enrichment 30wt%, reaches CO, H in the abundant burning furnace gas
2The high temperature that produces Deng inflammable gas reaches the top of the slag, quickens the fusing of top of the slag acid pellet and flux.Present embodiment does not adopt the coal gas reforming system; The grate kiln incendiary is a Sweet natural gas; The high-temperature flue gas that the slag liquid furnace produces utilizes waste heat boiler to reclaim generating.As shown in Figure 2.Other is with embodiment 1.
Embodiment 5:
Ferrous material: powdered iron ore; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: grate kiln.
A slag liquid furnace (9), supporting two oxidized stills (22) and (922), because oxidized still (22) long term high temperature is operated the anti-material life-span and can be reduced, two oxidized stills are used alternatingly, and can increase substantially the work-ing life of oxidized still, and are as shown in Figure 3.Other is with embodiment 1.
Embodiment 6:
Ferrous material: including Mn-Fe breeze, wherein manganese content 30%, iron level 15%; Carbonaceous material: coal dust, sulphur phosphorus is low as far as possible, and general fixed carbon content is more than 77%; Pellet sintering equipment: Dwight-Lloyd sintering machine.
The oxidized still temperature reaches 1600 ℃ fast, and the low carbon low silicon manganeseirom (C＜0.05, Mn:65-66%, Fe:32-33%, P＜0.015%, S＜0.06%, Si＜0.01%) of smelting high added value is as shown in Figure 1.Other is with embodiment 1.
Claims (9)
1. a slag bath molten reduction continuous steelmaking technique comprises the steps:
1) requires to be baked to 1000-1100 ℃ to the excessive iron mouth of slag liquid furnace, oxidized still and " second " shape according to roast technic; Add high temperature oxidation pelletizing, pre-melted slag and lump coal or coke; Injection coal oxygen; Make the scum molten bath that in the slag liquid furnace, forms the thick 700-800mm of molten iron, the thick 600-700mm of slag, promptly get into normal the smelting; Only increase temperature acid pellet and flux after getting into normal the smelting;
2) get into the normal back that smelts and implement slag top end composite blowing; Be that carbon-oxygen gun implements to be rich in carbon material/oxygen winding-up to the slag bottom apart from 300-200mm place, scum interface; The high temperature that carbonaceous material and oxygen reaction produce is by the slag efficient absorption; The CO that produces rises and stirs slag, and carbon more than needed keeps the reductibility of slag; Coal gas oxygen rifle is implemented rich combustible gas/oxygen winding-up to the slag top apart from top of the slag 260-200mm place, combustible gas and oxygen burning form 1500 ℃～1600 ℃ high-temperature slag district, and the strong agitation top of the slag, and combustible gas more than needed keeps the reductibility of slag; The burning rifle is blown into 1200～1300 ℃ oxygen-rich air or oxygen to the space of molten slag layer top, with CO, the H of slag liquid furnace generation
2Burning, the high temperature of generation reaches the cinder high-temperature district;
3) ferrous material is utilized the high temperature oxidation pelletizing of the proportion of pellet sintering device fabrication for 1.8-2.2; Join the high-temperature slag district that slag liquid furnace proportion is 2.5-3; The high temperature oxidation pelletizing that swims in the high-temperature slag district is melted fast forms the liquid iron oxide compound; In the slag that contains high temperature carbonaceous material and a large amount of CO, be reduced very soon in the liquid iron oxide compound decline process and obtain the low-carbon (LC) molten iron, Low Carbon Iron is landed into the molten bath under water; Said low-carbon (LC) molten iron is the molten iron of C content 1.5-3.0wt%; The ratio of carbonaceous material more than needed is 3～50% (wt%) in the slag;
4) when step 3) is carried out, in the slag liquid furnace, add the flux slag making, to molten steel desulfurizing, dephosphorization, thereby obtain the molten steel of phosphorus content＜0.015%, sulphur content＜0.06%, basicity of slag is controlled at 1.1-1.3;
5) the molten bath molten iron continuously flows into oxidized still through the excessive iron mouth of " second " shape; In oxidized still, add flux slag making desulfurization, dephosphorization; Basicity of slag is controlled in 3.0～3.5 scopes; Further adjust C content and temperature in the molten steel through oxidized still BOTTOM OXYGEN gas permeable brick and top blow oxygen lance oxygen blast,, directly supply LF or RH refining furnace to obtain the qualified molten steel of 1550 ℃～1700 ℃ of C content 0.01～0.50%, temperature;
6) the oxidized still tap hole is positioned at oxidized still apart from furnace bottom 100-150mm place; The oxidized still slag notch is positioned at 300-350mm place, oxidized still tap hole top; After oxidized still fills with molten steel and accomplishes the oxygen blast smelting operation, close the excessive iron mouth sealed wall of " second " shape that this oxidized still links to each other; Or the slag liquid furnace opens the oxidized still tap hole and implements slag free tapping when implementing out slag operation, and the slag above the molten steel plays the provide protection to the stove inwall with on the stove inwall of oxidized still, hanging up one deck slag in the molten steel decline process; Stop tapping when molten steel drops to the following time sealing tap hole of oxidized still slag notch, open slag notch and begin to slag tap, accomplish the rear enclosed slag notch of slagging tap, open " second " shape iron mouth sealed wall that overflows and implement next stove oxygen blast smelting operation.
2. slag bath molten reduction continuous steelmaking technique as claimed in claim 1 is characterized in that thickness of slag layer was 600mm～2000mm when step 1) was normally smelted; Step 2) said carbonaceous material is one or more in coal dust, coke powder, Sweet natural gas, combustible ice or the coke-oven gas, when carbonaceous material is coal dust or coke powder with N
2Gas sprays into do carrier gas, when carbonaceous material or inflammable gas are Sweet natural gas, combustible ice or coke-oven gas, directly sprays into; The temperature of the described high temperature oxidation pelletizing of step 1) and step 3) is 1100 ℃～1250 ℃.
3. slag bath molten reduction continuous steelmaking technique as claimed in claim 1 is characterized in that, step 3) pellet sintering equipment is to remove improved belt type roasting machine of cooling section or grate kiln; Ferrous material is processed pelletizing, is sintered to the acid pellet of 1100～1250 ℃ of temperature, joins the high-temperature slag district of slag liquid furnace through the high temperature charging system.
4. a slag bath molten reduction continuous steelmaking device comprises slag liquid furnace (9) and oxidized still (22); Slag liquid furnace (9) links to each other through the excessive iron mouth (18) of " second " shape with oxidized still (22), realizes that no slag taps a blast furnace; Slag liquid furnace (9) top is provided with burning rifle (11); Slag liquid furnace (9) furnace wall is provided with coal gas oxygen rifle (12) and carbon-oxygen gun (13), and slag liquid furnace middle part is provided with slag liquid furnace slag notch (14), slag liquid furnace bottom is provided with and puts steel mouth (15), the excessive iron mouth (18) of " second " shape, slag liquid furnace coal gas delivery port (8); Oxidized still (22) is provided with oxidized still oxygen rifle (23), oxidized still string jar flux and adds system (24), oxidized still slag notch (26), oxidized still tap hole (27), oxidized still bottom and put steel mouth (28), oxidized still coal gas delivery port (21);
It is characterized in that described slag bath molten reduction steel-making device also comprises pellet sintering equipment (1) and coal gas upgrading stove (35), pellet sintering equipment (1) links to each other through the high temperature charging system with slag liquid furnace (9); Slag liquid furnace coal gas delivery port (8) converges after cyclone dust removal (33) is connected with the coal gas reforming system with oxidized still coal gas delivery port (21) pipeline mutually;
Said pellet sintering equipment is improved belt type roasting machine or the grate kiln that directly goes out 1100 ℃～1250 ℃ of pelletizings;
Above the slag liquid furnace, being provided with 2-8 in the furnace gas and propping up burning rifle (11), is removable, and the burning rifle becomes the γ angle with slag liquid furnace sidewall, and the γ angle is 45～60 degree angles, along with the variation of sinter thickness burns that rifle can insert, proposition or translation-angle;
Being provided with 2-8 on slag liquid furnace slag top and propping up coal gas oxygen rifle (12), is removable, and coal gas oxygen rifle becomes the β angle with slag liquid furnace sidewall, and the β angle is 50～75 degree angles, along with the variation coal gas oxygen rifle of sinter thickness can insert, proposition or translation-angle;
Being provided with 2-12 in slag liquid furnace slag bottom and propping up carbon-oxygen gun (13), is removable, and carbon-oxygen gun becomes the α angle with slag liquid furnace sidewall, and the α angle is 35～65 degree angles.
5. slag bath molten reduction continuous steelmaking device as claimed in claim 4 is characterized in that, the high temperature charging system links to each other with the blow tank (2) of pellet sintering equipment (1), comprises feed bin (3), track (4), skip car (5), tandem tank type distributor (7) successively; Tandem tank type distributor (7) links to each other with slag liquid furnace bell (10), and tandem tank type distributor (7) top is provided with flux feed bin (6); Skip car (5) runs on the track (4).
6. slag bath molten reduction continuous steelmaking device as claimed in claim 4; It is characterized in that; The coal gas reforming system links to each other with oxidized still coal gas delivery port (21) with slag liquid furnace coal gas delivery port (8) through coal gas of high temperature pipeline (32), comprises coal gas of high temperature pipeline (32), cyclone dust removal (33), dust outlet (34), gas exit (35), coal gas upgrading stove (36), upgrading coal gas output channel (37) successively.
7. slag bath molten reduction continuous steelmaking device as claimed in claim 4 is characterized in that slag liquid furnace (9) is the cylindrical stove that molten bath district diameter is little, slag district diameter is big, and oxidized still (22) is cylindrical stove; A slag liquid furnace is joined two oxidized stills.
8. slag bath molten reduction continuous steelmaking device as claimed in claim 4 is characterized in that slag liquid furnace slag notch (15) is positioned at above 600-800mm place, slag liquid furnace scum interface, with the minimum thickness that keeps slag in the slag liquid furnace greater than 600mm;
Oxidized still (22) bottom is provided with BOTTOM OXYGEN gas permeable brick (31); Oxidized still (22) top is provided with oxygen rifle (23) blowing molten steel, makes the temperature of C content and molten steel in the steel reach the requirement of RH or LF refining furnace; Oxidized still string jar flux adds system (24) and adds sludging flux for oxidized still; Oxidized still tap hole (27) is positioned at oxidized still (22) apart from furnace bottom 100-200mm place, and oxidized still slag notch (26) is positioned at 300-400mm place, oxidized still tap hole (27) top.
9. slag bath molten reduction continuous steelmaking device as claimed in claim 4 is characterized in that oxidized still BOTTOM OXYGEN gas permeable brick is established 1～7; The excessive iron mouth (18) of " second " shape is provided with excessive iron mouth gas exit (38) of " second " shape and the excessive iron mouth sealed wall (39) of " second " shape.
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