CN104178593A - Method and equipment for directly reducing iron ore powder - Google Patents

Method and equipment for directly reducing iron ore powder Download PDF

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Publication number
CN104178593A
CN104178593A CN201410431580.XA CN201410431580A CN104178593A CN 104178593 A CN104178593 A CN 104178593A CN 201410431580 A CN201410431580 A CN 201410431580A CN 104178593 A CN104178593 A CN 104178593A
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holes
iron ore
kiln
tunnel furnace
reduction
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CN104178593B (en
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桑曙光
何德武
安冬
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PANZHIHUA LIYU MINING CO Ltd
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PANZHIHUA LIYU MINING CO Ltd
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Abstract

The invention discloses a method for reducing iron ore powder and particularly relates to a method for directly reducing the iron ore powder, wherein the method can be used for avoiding an egg shell effect. The method for directly reducing the iron ore powder comprises the following steps: A, uniformly mixing magnet concentrate powder, coal powder and a catalyst; B, pressing the uniformly mixed materials into material blocks with holes, and forming honeycomb holes on the material blocks with holes; C, feeding the material blocks with holes into a tunnel kiln for being directly reduced, wherein the tunnel kiln is a straight line shape, and a furnace hearth of the tunnel kiln is separated by a heat conduction material plate to form upper and lower layers, so that a combustion chamber and a reaction chamber are formed; and feeding the material blocks with holes into the reaction chamber, and indirectly heating the material blocks with holes by virtue of heat produced in the combustion chamber. The furnace chamber is divided into the combustion chamber and the reaction chamber, so that the material blocks with holes are not directly heated, and the heat in the combustion chamber is conducted into the reaction chamber by virtue of the heat conduction material plate; and meanwhile, the material blocks with holes are provided with honeycomb holes, so that the heating degree on each position of each material block is almost the same.

Description

Powdered iron ore direct reduction process and equipment
Technical field
The present invention relates to a kind of reduction of iron ore fines method, especially a kind of powdered iron ore direct reduction process.In addition, the invention still further relates to a kind of metallurgical equipment, especially a kind of powdered iron ore equipment of direct reduction.
Background technology
Iron And Steel Industry is powdered iron ore to be delivered to blast furnace smelting again through oversintering become molten iron, then becomes the main raw material with high heat energy of next procedure, and long-term industrial practice has formed the traditional technology of mass-producing maturation.Along with technical study and progress, this traditional technology is due to its high energy consumption, with high investment, high pollution and high running cost, and is subject to the challenge of Direct Reducing Iron Process technology.At present direct-reduced iron research and to produce be mainly taking the reduction of gas base and coal base reduction as main, with respect to traditional technology, iron oxide reduction in powdered iron ore is become to metallic iron product, and a set of direct-reduced iron functions of the equipments can replace sintering, the coking of traditional technology, the function of blast furnace.But, with regard to direct-reduced iron research and the present situation of producing: 1. powdered iron ore as main raw material because of test, the technique of producing or to go back the purposes of original product different, just there is difference in various degree in the material preparatory stage, not only comprise the component compatibility differences such as coal-based, granularity, sweetening agent, catalyzer, and have powdered iron ore directly packed into container, the extruding having or be pressed into pelletizing and other shape.The difference of component compatibility, directly determines the needed temperature of reduction reaction and the speed of response at this temperature; Powdered iron ore directly packs container into reduces, although save powdered iron ore moulding process, although in test component compatibility is carried out to some adjustment, found that thermal conduction is the condition of iron reduction reaction realization and the restrictive factor of speed of response; The iron reduction reaction of pelletizing or other shape, test and practice in often because of component compatibility, compaction rate and heat-supplying mode do not mate or because of one factor improper, surface in shape forms " eggshell " effect, its mechanism is that material is by direct heating, its surface is subject to thermal velocity much larger than material internal heat conduction of velocity, result surface material has been molten and the inner required temperature of reaction that also do not reach, and " eggshell " just produced, and so not only affected speed of response but also affected reduction ratio; 2. in research and the application aspect of powdered iron ore direct-reduction technique, be summed up two large main flows: the one, the short flow process of electric furnace forming with electrosmelting special steel; The 2nd, along with the achievement in research of powder metallurgy correlation technique continues to bring out, promote greatly developing of Powder Metallurgy Industry, powdered iron ore direct-reduction iron sponge powder is as the main raw material of powder metallurgy.With regard to reduction apparatus, the stove of coal base reduction has tunnel furnace, rotary kiln, rotary hearth furnace etc., and these stove single machine production abilities are not high, are only suitable for the production of middle and small scale; For the shaft furnace of gas base directly reducing; although can carry out large-scale production; but the dependency to Sweet natural gas is stronger; in the situation that there is no Sweet natural gas; must produce coal gas by " coal-made gas furnace " with coal dust; requiring the material being reduced must be acid pellet simultaneously, and drawback as above also there will be.3. the research of powdered iron ore direct-reduction and application need to be expanded further, and its key link is: be more reasonably applicable to the material compatibility of tooling, augmenting response interface, improves heat conduction velocity, and then entirety improves reduction reaction speed; Optimize and creatively design stove equipment, having both as far as possible the special advantage of other stove equipment, for thermal conditions, process temperature, the reducing atmosphere of stove, UTILIZATION OF VESIDUAL HEAT IN, material pack into, product output and cooling etc. realize automatic monitoring and control; Finally realize the integrated artistic equipment size of capacity, product high-quality, the less energy-consumption of operation low cost, process control specification.
Summary of the invention
Technical problem to be solved by this invention is to provide one avoids the powdered iron ore direct reduction process of " eggshell " effect.
The present invention solves the powdered iron ore direct reduction process that its technical problem adopts, and comprises the following steps:
A, magnet fine mineral powder, coal dust and catalyzer are mixed; The usage ratio of magnet fine mineral powder, coal dust and catalyzer should be determined according to the raw material of concrete use, and its selecting method and traditional direct reduction process are similar;
B, the material after mixing is pressed into material piece with holes, on material piece with holes, is formed with honeycomb hole, on material piece with holes, form hole array, the structure of similar honeycomb coaly; These honeycomb holes can pass through for hot gas flow, have increased the surface-area that material piece is heated, and its hole is heated evenly material, has effectively reduced the temperature difference of whole material piece with holes;
C, material piece with holes is sent into direct-reduction in tunnel furnace, wherein linearly shape of tunnel furnace, the burner hearth of tunnel furnace separates into two-layer up and down with thermoconductive material board, form combustion chamber and reaction chamber; Material piece with holes is admitted in reaction chamber, utilizes the heat indirect heating producing in combustion chamber material piece with holes.Tunnel kiln structure in this step can be referring to follow-up described equipment, but be not limited only to the equipment in the present invention.In combustion chamber, general using coal gas or Sweet natural gas carry out combustion heating, and the fuel of selecting need be according to needing practical situation to determine, and are not necessarily limited to the fuel that present method is recommended.Burner hearth is separated with thermoconductive material board plate, in service at laser heating, the heat energy of combustion chamber can approach balance with the heat energy of reaction chamber, because material piece with holes is not subject to direct heating, but in reaction chamber for uniform temperature comparatively, the inside and outside temperature of material piece with holes is like this more even, has just cracked " eggshell " effect by the mode of this indirect heating.
Further, in A step, use granularity be-320~100 object v-ti magnetite concentrate powder and granularity-20~30 object coal dust and sodium salt catalyzer in mass ratio the ratio of 3~4:0.8~1.2:0.3~0.4 mix.
Further, in B step, the density of described material piece with holes is not less than 2.7g/cm 3, honeycomb hole aperture present method makes raw material powder density by 1.7g/cm 3after compacting, density reaches 2.7g/cm 3, the coal in material piece reaches the CO effusion resistance increment that rear certain temperature burning generates, and is conducive to reduction reaction and carries out ground thoroughly.Meanwhile, even if powder and material briquetting are approached by thermal conduction rate, on chassis face, in the space of a cubic metre, deposit so one ton of material more, make that production efficiency is high and cost is low.
Further, in C step, the pressure-controlling of reaction chamber is between+20~-+50Pa.Pressure recommend adoption variable frequency adjustment in reaction chamber and furnace pressure variable valve dual control system, thus pressure-controlling accurately obtained.
Further, in C step, described tunnel furnace ringwise.
Be further, in C step, one end of rectilinear tunnel furnace is provided with fire door, and the other end is closed, material piece with holes enters tunnel furnace and in reciprocating mode and reduces in tunnel furnace from fire door, and the material piece with holes after reduction is discharged from fire door.Material piece with holes enters into the reaction chamber of tunnel furnace with chassis, move to the other end of tunnel furnace always, and then former road returns, different temperature and pressure subregions is set in tunnel furnace, control the residence time of material piece with holes at each subregion by the speed of controlling chassis.
Another technical problem that will solve of the present invention is to provide one avoids the powdered iron ore equipment of direct reduction of " eggshell " effect.
The present invention also provides a kind of powdered iron ore equipment of direct reduction, comprise material Special purpose pressing machine, feed mechanism and tunnel furnace, described material Special purpose pressing machine is described tunnel furnace feed by feed mechanism, described tunnel furnace comprises kiln body, lays the track of kiln body, chassis is in orbit set and is laid in the firing system on kiln body, is provided with honeycomb hole molding structure on the mould of described material Special purpose pressing machine; Linearly shape of described tunnel furnace, described tunnel furnace also comprises thermoconductive material board, and described thermoconductive material board is arranged in kiln body, and the burner hearth between chassis table top and kiln body kiln top is separated into two-layer up and down, it is at the middle and upper levels for laying the combustion chamber of firing system, and lower floor is reaction chamber.Kiln body be shaped as linear, corresponding track is also linear.Thermoconductive material board is laid along the sealing of burner hearth axis, and thermally conductive material adopts resistant to elevated temperatures thermally conductive material, and concrete material should be determined according to actual situation, to reach the balance between energy-conservation and cost.
Further, described thermoconductive material board is carborundum plate, and described carborundum plate is the domes of vault towards kiln top.The thermal conductivity of silicon carbide is 3 times of ferrous materials, and has strong thermal shock drag, can obtain enough heat energy like this at the material of reaction chamber; The carborundum plate of domes both can increase the space of reaction chamber, can increase again the heat-conducting area of silicon carbide version.
Further, the kiln body of rectilinear tunnel furnace is linear, and its one end is provided with fire door, and the other end is closed, and described chassis can move back and forth.This mode is entered an one-way movement mode bringing out with respect to one end, almost can save the kiln body length of half, but its efficiency is entered an one-way movement mode bringing out lower than one end, is applicable to small-scale production and uses.
Further, described firing system comprises the tipburn mouth that is arranged on top of combustion chamber and the side burner that is arranged on combustion chamber outer side wall.Tipburn mouth is a kind of flat-flame burner, heat insulation in this burner air chest band, can be suitable, under the effect of tubaeform diffusing opening and airflow centrifugal power, making air-flow be close to furnace wall inner edge evenly spreads to surrounding, and form recirculating zone in burner axial centre, when the medium back flow refluxing is when approaching soon swirling eddy exit, be involved in main rotating fluid thigh by air-flow, become its part, reflux medium can play with stove internal flame gas the effect that stationary flame catches fire, also can impel stream strand jet attached flow, thereby form open and flat shape disk flame.Side burner is a kind of sub-high combustion rate burner, adiabatic, simple in structure in burner shell adopts, and can form sub-high-speed flame, fully controls combustion atmosphere in stove, is specially adapted to the high occasion of the high temperature degree of preheating, and flameholding is safe and reliable.
Further, also comprise discharging machine and anti-oxidation pond, described discharging machine and feed mechanism are all positioned at one end of fire door all corresponding with chassis table top, and described discharging machine arranges between feed mechanism and fire door, and the outlet of described discharging machine is connected with anti-oxidation pond.
Further, the working surface layers of described chassis adopts the high-strength mould material of chromium corundum alkali resistant.
Further, in the working surface layers of described chassis, be provided with burner port, described burner port is positioned at the sidewall of working surface layers.
Be further, described tunnel furnace also comprises sealing structure for water, described sealing structure for water comprises water sealed tank, dead knife and movable blade, described water sealed tank is positioned at kiln body bottom, described dead knife is fixedly mounted on kiln body bottom place, described movable blade is arranged on pallet bottom, and described dead knife and movable blade are by coordinating to seal the gap between chassis and kiln body bottom with liquid in water sealed tank.
Further, described sealing structure for water also comprises dreg scraper, and described dreg scraper is arranged on movable blade bottom and is positioned at water sealed tank.
Further, described kiln body is compound masonry, and its liner adopts that refractory castable is integrated poured to be formed, and the outer double-deck light lagging material that adopts carries out thermal insulation.
Further, described tunnel furnace is designed to ladder parameter type passage according to gas, pressure, temperature relation on longitudinal section.Be that pressure, the temperature variation of tunnel furnace on longitudinal section is stepped, instead of all identical in whole tunnel furnace.
The invention has the beneficial effects as follows: owing to burner hearth being separated into combustion chamber and reaction chamber, this makes material piece with holes can not be subject to direct heating, but by thermoconductive material board, the heat in combustion chamber is transmitted in reaction chamber, in service at laser heating, the heat energy of combustion chamber can approach balance with the heat energy of reaction chamber, thereby heat material piece with holes, simultaneously because material piece with holes itself has honeycomb hole, the degree of heat that makes thus material piece be subject in each position approaches, namely the internal-external temperature difference of material piece is very little, the mode of this indirect heating has just cracked " eggshell " effect.
Brief description of the drawings
Fig. 1 is the structural representation of the first embodiment of the present invention;
Fig. 2 is the structural representation of the second embodiment of the present invention;
Fig. 3 is the schematic diagram of cross section of the present invention;
Fig. 4 is the cross sectional representation of charging place of the present invention;
Fig. 5 is the schematic diagram of chassis working face;
Fig. 6 is that the A-A of Fig. 5 is to schematic diagram;
Component, position and numbering in figure: material Special purpose pressing machine 1, kiln body 2, track 3, chassis 4, thermoconductive material board 5, combustion chamber 6, reaction chamber 7, tipburn mouth 8, side burner 9, endless belt conveyor 10, charging pushing device 11, discharging pushing device 12, discharging machine 13, anti-oxidation pond 14, discharge flue 15, working surface layers 16, thermopair 17, burning vision slit 18, cooling basin 19, material piece 20 with holes, sealing structure for water 21.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Method of the present invention comprises the following steps:
A, use Panzhihua Region granularity are-320~100 object v-ti magnetite concentrate powder, and its chemical composition is TFe58.62%, TiO 28.49%, V 2o 50.721%, SiO 23.19%, S0.42%, P0.015%, with granularity-20~30 object coal dust and sodium salt catalyzer in mass ratio the ratio of 3~4:0.8~1.2:0.3~0.4 mix; In the time adopting other raw material, should according to circumstances suitably more rescale.
B, the material after mixing is pressed into material piece 20 with holes, on material piece 20 with holes, is formed with honeycomb hole; The material that compatibility is mixed packs in the mould designing and producing, and is pressed into the spherical lumpy material piece of similar honeycomb briquette with the press of 680 tons, and density reaches 2.7g/cm 3, the aperture of material piece with holes span 10-12mm, the lumpiness of material piece 20 with holes and the special material distributing machine to trolley surface cloth match, as the shape of the material piece 20 with holes in Fig. 1 and the layout on chassis face.Like this, increased the surface-area that material piece 20 with holes is heated on the one hand, its hole is heated evenly material; The refractory materials working surface layers of chassis 4 also reaches and keeps certain temperature at long-term continuous operation, also can conduct heat to material piece 20 with holes from material piece with holes 20 bottoms, what press was suppressed material piece 20 with holes on the other hand is more closely knit, makes powder density by 1.7g/cm 3after compacting, density reaches 2.7g/cm 3, the coal in material piece 20 with holes reaches the CO effusion resistance increment that certain temperature afterfire generates, and is conducive to reduction reaction and carries out ground thoroughly.Meanwhile, even if powder and material briquetting are approached by thermal conduction rate, on chassis face, in the space of a cubic metre, deposit so one ton of material more, make that production efficiency is high and cost is low.
C, material piece 20 with holes is sent into direct-reduction in tunnel furnace, wherein the burner hearth of tunnel furnace separates into two-layerly up and down with thermoconductive material board 5, forms combustion chamber 6 and reaction chamber 7; Material piece 20 with holes is admitted in reaction chamber 7, utilizes the heat indirect heating material piece 20 with holes producing in combustion chamber 6.
Atmosphere according to processing requirement in reaction chamber adopts variable frequency adjustment and furnace pressure variable valve dual control system, and the pressure-controlling of reaction chamber 7 is between+20~-+50Pa.CO on-line gas analysis instrument is loaded on before induced draft fan, in the time that flue gas CO exceedes prescribed value, mixes the air quantity of high-temperature flue gas section by motor valve control, and CO and oxygen are burnt again, and the CO of this part guarantees reduction effect because ensureing appropriate value.
Three grades of distributed control systems of present method recommend adoption computer: upper management level, is made up of high performance technical grade computer and printing device.Is furnished with the special software of Industry Control, mainly complete supervision to processing unit running status and the function of report printing, comprising: the operation demonstration of total looks, the demonstration of thermal parameter, curve display, the alarm display etc. of important parameter, relevant amendment, the integrating of flow, the storage of system data; Process control level, is made up of PLC, power supply, communication unit, various input and output module etc.The collection of main settling signal, control and the communication of system; Execute-in-place level arranges (being switched to computer control) and manual (switch on the spot and control) mode automatically, and the indispensable instrument that maintains the normal operation of processing unit is installed on panel board and electric control panel.Manual mode can be separated from computer control system, in instrument cabinet and electrical control cubicles, directly the control of thermal parameter is operated.
The Control for Kiln Temperature of tunnel furnace adopts continuously proportional control mode, the temperature of thermopair access through temperature controller relatively after output (following signal system all adopts 4~20mA) control high low signal to the air on each section of house steward, the size that gas regulator is controlled valve position, thereby regulate the feed rate of air, coal gas to realize the adjusting control of temperature.Air, gas regulator are synchronously carried out, but they have an allocation proportion set(ting)value (K value 0.8~1.2) on computers, complete the automatic mixing of air and coal gas by setting this value, in the flux values that this value can detect according to fow-through orifice and stove, virtual condition is selected.
The inner flue gas of the stove of tunnel furnace is made up of two parts, and gas-fired produces exhaust gas volumn and afterburning air enters and CO burning generation exhaust gas volumn, flows out by smoke outlet.Inner flue gas of the stove flows to as contrary furnace bottom turning direction, flue gas after smoke outlet is discharged by settling pocket A by suitable dust sedimentation, flue gas divides two plumes to cross two groups of air heat exchangers, two groups of combustion air and afterburning air respectively.Flue-gas temperature after two groups of air heat exchangers is approximately down to 620 DEG C of left and right, enters settling pocket B and enter gas change heater again after these two strands of flue gases conflux again.20 DEG C of inlet air temps, through 550 DEG C of left and right of its temperature out of heat exchange; 20 DEG C of gas entry temperature, can reach 300 DEG C of left and right through its temperature out of heat exchange, reach energy-saving and cost-reducing effect.
Introduce the inventive method below by embodiment:
Embodiment 1: adopt present method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200 order), 20~30g coal dust (order~20, granularity-10 order), 1.1~1.5g sodium salt mixes (mouldable), preheating 10~20min at the temperature of 1150 DEG C, reductase 12 5~35min at the temperature of 1300 DEG C, after discharging water-cooled, obtaining grade is 70~80% metallization agglomerates, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 98%, iron yield reaches 95%, residue Iron Grade of Tailings 10~15%, iron yield 3~4%, titanium grade 39~40%, mine tailing titanium yield 80%, one time reduced iron powder obtains through hydrogen reducing the secondary reduction iron powder that iron taste is greater than 99.5% in 600~800 DEG C.
Embodiment 2: adopt present method to prepare reduced iron powder
By 100g Flos Bombacis Malabarici sefstromite concentrate (iron content: 55%, titaniferous: 10%, granularity-200 order), 20~30g coal dust (order~20, granularity-10 order), 1.1~1.5g sodium salt mixes (mouldable), preheating 10~20min at the temperature of 1150 DEG C, reductase 12 5~35min at the temperature of 1300 DEG C, after discharging water-cooled, obtaining grade is 70~80% metallization agglomerates, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 97.3%, iron yield reaches 95%, residue Iron Grade of Tailings 10~15%, iron yield 3~4%, titanium grade 39~40%, mine tailing titanium yield 80%, one time reduced iron powder obtains through hydrogen reducing the also reduced iron powder of secondary that iron taste is greater than 99.5% in 600~800 DEG C.
Embodiment 3: adopt present method to prepare reduced iron powder
By common 100g Flos Bombacis Malabarici iron ore concentrate (iron content: 60%, granularity-200 order), 20~30g coal dust (order~20, granularity-10 order), 1.1~1.5g sodium salt mixes (mouldable), preheating 10~20min at the temperature of 1150 DEG C, reductase 12 5~35min at the temperature of 1300 DEG C, after discharging water-cooled, obtaining grade is 70% metallization agglomerate, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 97.5%, iron yield reaches 95%, residue Iron Grade of Tailings 10~15%, iron yield 3~4%, one time reduced iron powder obtains through hydrogen reducing the secondary reduction iron powder that iron taste is greater than 99.5% in 600~800 DEG C.
Embodiment 4: adopt present method to prepare reduced iron powder
By common 100g Flos Bombacis Malabarici iron ore concentrate (iron content: 63%, granularity-200 order), 20~30g coal dust (order~20, granularity-10 order), 1.1~1.5g sodium salt mixes (mouldable), preheating 10~20min at the temperature of 1150 DEG C, reductase 12 5~35min at the temperature of 1300 DEG C, after discharging water-cooled, obtaining grade is 70% metallization agglomerate, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 98.3%, iron yield reaches 95%, residue Iron Grade of Tailings 10~15%, iron yield 3~4%, one time reduced iron powder obtains through hydrogen reducing the also reduced iron powder of secondary that iron taste is greater than 99.5% in 600~800 DEG C.
Embodiment 5: adopt present method to prepare reduced iron powder
100g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 47%, granularity-200 order), 39~43g coal dust (order~20, granularity-10 order), 6.5~8g sodium salt are mixed to (mouldable), at the temperature of 1300 DEG C, reduce 35~45min, after discharging water-cooled, obtaining grade is 35% metallization agglomerate, metallization agglomerate obtains reduced iron powder one time through broken, ore dressing, iron grade is 95%, iron yield reaches 88%, residue Iron Grade of Tailings 5%, iron yield 10%, titanium grade 80%, mine tailing titanium yield 87%
Embodiment 6: adopt present method to prepare reduced iron powder
100g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200 order), 39~43g coal dust (order~20, granularity-10 order), 6.5~8g sodium salt are mixed to (mouldable), at the temperature of 1300 DEG C, reduce 35~45min, after discharging water-cooled, obtaining grade is 35% metallization agglomerate, metallization agglomerate obtains reduced iron powder one time through broken, ore dressing, iron grade is 94%, iron yield reaches 85%, residue Iron Grade of Tailings 5%, iron yield 10%, titanium grade 80%, mine tailing titanium yield 85%.
Embodiment 7: adopt present method to prepare reduced iron powder
By 77g Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200 order), 21~24g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 47%, granularity-200 order), 35~39g coal dust (order~20, granularity-10 order), 2.1~3g sodium salt mixes (mouldable), at the temperature of 1300 DEG C, reduce 35~45min, after discharging water-cooled, obtaining grade is 60% metallization agglomerate, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 97%, iron yield reaches 95%, residue Iron Grade of Tailings 10%, iron yield 5%, titanium grade 52%, mine tailing titanium yield 85%, one time reduced iron powder obtains through hydrogen reducing the also reduced iron powder of secondary that iron taste is greater than 99.5% in 600~800 DEG C.
Embodiment 8: adopt present method to prepare reduced iron powder
By 77g Flos Bombacis Malabarici sefstromite concentrate (iron content: 55%, titaniferous: 9%, granularity-200 order), 21~24g Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200 order), 35~39g coal dust (order~20, granularity-10 order), 2.1~3g sodium salt mixes (mouldable), at the temperature of 1300 DEG C, reduce 35~45min, after discharging water-cooled, obtaining grade is 56% metallization agglomerate, metallization agglomerate is through fragmentation, ore dressing obtains reduced iron powder one time, iron grade is 98%, iron yield reaches 95%, residue Iron Grade of Tailings 10%, iron yield 5%, titanium grade 52%, mine tailing titanium yield 83%, one time reduced iron powder obtains through hydrogen reducing the also reduced iron powder of secondary that iron taste is greater than 99.5% in 600~800 DEG C.
Equipment of the present invention comprises material Special purpose pressing machine 1, feed mechanism and tunnel furnace, described material Special purpose pressing machine 1 is described tunnel furnace feed by feed mechanism, described tunnel furnace comprises kiln body 2, passes the track 3 of kiln body 2, is arranged on the chassis 4 on track 3 and is laid in the firing system on kiln body 2, is provided with honeycomb hole molding structure on the mould of described material Special purpose pressing machine 1; Described tunnel furnace also comprises thermoconductive material board 5, and described thermoconductive material board 5 is arranged in kiln body 2, and the burner hearth between chassis 4 table tops and kiln body 2 kilns tops is separated into two-layer up and down, and it is at the middle and upper levels for laying the combustion chamber 6 of firing system, and lower floor is reaction chamber 7.This equipment is in actual production, material piece 20 with holes only passes through from reaction chamber 7, therefore material piece 20 with holes can't directly be heated, thermoconductive material board 5 separates burner hearth, in service at laser heating, the heat energy of combustion chamber 6 can approach balance with the heat energy of reaction chamber 7, has just cracked " eggshell " effect by the mode of this indirect heating.
In order to obtain good heat conductivility, described thermoconductive material board 5 is carborundum plate, and described carborundum plate is the domes of vault towards kiln top.The thermal conductivity of silicon carbide is 3 times of ferrous materials, and has strong thermal shock drag, can obtain enough heat energy like this at the material of reaction chamber; The carborundum plate of domes both can increase the space of reaction chamber, can increase again the heat-conducting area of silicon carbide version.
Fig. 1 is one embodiment of the present invention, can be described as annular tunnel kiln, and described kiln body 2 is arranged to circular arc along axis, and described track 3 is annular, and the two ends on described kiln body 2 circumferential directions are respectively feed end and discharge end.
Fig. 2 is another embodiment of the invention, can be described as straight shape tunnel furnace, and kiln body 2 is arranged to linear along axis, and described track 3 is also linear, and the feed end of kiln body 2 and discharge end share a port or lay respectively at the two ends of kiln body 2.
Above-mentioned two kinds of embodiments all adopt more piece chassis, for example, exist loop tunnel assembled 22 chassis, the smooth operation of feeling relieved in annular tunnel kiln, 3 drive units become 360 ° arrange and frequency conversion adjustable, make chassis travelling speed 2~6 weeks/hour scopes, so just can be convenient to laying of cloth and drawing mechanism.The more important thing is the selected of trolley surface refractory materials, because the material being reduced directly carries out on trolley surface refractory materials, requirement has intensity, do not ftracture, indeformable, sizing not, uses the high-strength mould material of chromium corundum alkali resistant to do trolley surface in test, reached desired result.
Firing system of the present invention comprises the tipburn mouth 8 that is arranged on 6 tops, combustion chamber and the side burner 9 that is arranged on combustion chamber 6 outer side walls.The layout of burner, as shown in Figure 1, mainly arranges tipburn mouth for annular tunnel kiln, select suitable silicon carbide sheet material by evidence, its thermal conductivity is 3 times of ferrous materials, and has strong thermal shock drag, can obtain enough heat energy like this at the material of reaction chamber.Adopt tipburn mouth and side burner bidirectional arrangements for straight shape tunnel furnace, as shown in Figure 2, simultaneously, chassis working surface layers 16 is with burner port, states burner port and be positioned at the sidewall of working surface layers 16, shown in Fig. 5 and Fig. 6, when iron powder or iron powder pressing block are heated reduction on chassis face, chassis is in static, and tipburn mouth and side burner are heated material up and down, is conducive to carrying out fast of reduction reaction.
Concrete, as shown in Figure 1 and Figure 4, described feed mechanism comprises endless belt conveyor 10, charging pushing device 11 and discharging pushing device 12, described endless belt conveyor 10 extends to the track 3 that is positioned at kiln body 2 feed ends from material Special purpose pressing machine 1, described charging pushing device 11 and discharging pushing device 12 are corresponding with material Special purpose pressing machine 1 position and chassis 4 positions respectively.Endless belt conveyor 10 is to 4 cloth of chassis material piece 20 with holes, endless belt conveyor 10 can adopt steel track type material distributing machine, its traffic direction is vertical with the direction of travel of chassis 4, from the cross-sectional direction of chassis 4, endless belt conveyor 10 is along chassis 4 surfaces, left side, under trolley track, circular flow is done on square channel and right side, specifically shown in Figure 4, there is a discharging pushing device 12 consistent with chassis traffic direction endless belt conveyor 10 tops, when material piece 20 with holes runs to while approaching chassis 4 outer rim setting point on discharging pushing device 12, discharging pushing device 12 is shifted material piece 20 with holes on endless belt conveyor 10 on 4, chassis onto, determined the travelling speed of chassis 4 by the material recovery time, ensure the compacting of material piece 20 with holes with two or more material Special purpose pressing machines 1.In fact, whole feed mechanism is the combination of material Special purpose pressing machine 1, endless belt conveyor 10, discharging pushing device 12 and charging pushing device 11, and it is chain to realize series.Chain retrodicting, be that chassis 4 travelling speed determine endless belt conveyor 10 travelling speed, when front-seat (row refers to chassis width) material piece 20 with holes move ahead distance just have after when row material piece with holes 20 position, on endless belt conveyor 10, must just in time there is row's material piece, now discharging pushing device 12 is according to infrared signal or the timely pusher of the time relay, same discharging pushing device 12 coordinates with material Special purpose pressing machine 1, material powder is injected mould by quantitative timing feeding machine, after material Special purpose pressing machine 1 compacting from the demoulding, material Special purpose pressing machine 1 also configures charging pushing device 11, on after hammer (or being called patrix) demoulding of material Special purpose pressing machine 1, lift, charging pushing device 11 pushing belt hole material pieces 20 are to endless belt conveyor 10, for ensureing that feeding speed at least needs more than 2 or 2 material Special purpose pressing machines 1 to coordinate.
Oxidized after coming out of the stove for fear of going back original product, as shown in Figure 1, also comprise discharging machine 13 and anti-oxidation pond 14, described discharging machine 13 is positioned at kiln body 2 discharge ends corresponding with chassis 4 table tops, and the outlet of described discharging machine 13 is connected with anti-oxidation pond 14.The chassis 4 of annular tunnel kiln, in process of production always in running status, adopts spiral discharging machine by skewed slot, the material after reduction directly to be sent into anti-oxidation pond again; The chassis of straight shape tunnel furnace is located in discharging and cloth material level, and pushing device directly pushes anti-oxidation pond by the material after reduction, then moves to cloth material level cloth, then enters the also original production of next round.
For the ease of discharging, described discharging machine 13 comprises spiral discharging machine and gear shovel; Described gear shovel is arc surface towards the one side of supplied materials direction, and the axis of described arc surface is vertical with supplied materials direction and parallel with chassis 4 table tops; Described gear shovel is corresponding with the entrance of spiral discharging machine.What gear shoveled is shaped as " " ", the baffle plate of similar bulldozer shovel.The lower edge of gear shovel is pressed close to chassis 4 working faces, and the material in the time that chassis 4 moves on its face is kept off shovel arc and rolls, and the screw blade before gear shovel is discharged material.
For timely cooling, the screw shaft of described spiral discharging machine is hollow form, is provided with feed-water end and water side on screw shaft; The inside of described gear shovel is provided with cooling water cavity, is respectively arranged with water-in and water outlet on cooling water cavity.Material is still in the condition of high temperature after coming out of the stove, and what adopt water quench can protect screw blade and gear shovel.
In order to obtain good sealing effectiveness, described tunnel furnace also comprises sealing structure for water 21, described sealing structure for water 21 comprises water sealed tank, dead knife and movable blade, described water sealed tank is positioned at kiln body 2 bottoms, described dead knife is fixedly mounted on kiln body 2 bottom places, described movable blade is arranged on chassis 4 bottoms, described dead knife with movable blade by coordinate to seal the gap between chassis 4 and kiln body 2 bottoms with liquid in water sealed tank.Described sealing structure for water 21 also comprises dreg scraper, and described dreg scraper is arranged on movable blade bottom and is positioned at water sealed tank.In the time that chassis 4 rotates, circumferential weld falls into material in water sealed tank and some other impurity like this, along with relative movement between the movable blade of rotating and fixing water sealed tank, is progressively scraped the funnel place on water sealed tank, finally by the regular scarfing cinder of funnel, transports with dolly.
Lower mask body is introduced the specific works details of present device:
As shown in Figure 1, Figure 3, the mould of material Special purpose pressing machine 1 is accepted from mixer again through the compatibility material of constant feeder, material Special purpose pressing machine 1 suppresses, from the demoulding, the carrier bar of endless belt conveyor 10 pushed material piece 20 with holes to by charging pushing device 11, under the conveying of grouser shoe, material piece 20 with holes reaches the working surface layers 16 of chassis 4, interlock moves discharging pushing device 12, the width of the pushing plate of discharging pushing device 12 and working surface layers 16 matches, and material piece 20 with holes is just disposed on the working face 16 of chassis 4.
Chassis 4 is under three drive units that become 120 ° of distributions drive, do clockwise by pre-set velocity operation, discharge flue 15 is arranged on the initiating terminal of kiln body 2 chargings, and discharge flue 15 is connected with the A of settling chamber, B and two groups of heat exchangers, and flue gas is realized the inside and outside row of mark by sack cleaner, thionizer again.
Endless belt conveyor 10, under the driving of drive unit, starts the transverse section operation around chassis 4, carries material piece 20 with holes in the working surface layers 16 of chassis 4 time, moves to chassis 4 track belows and obtains cooling by concrete cooling pond 19 grouser shoes.
Sealing structure for water 21 is arranged on the column of inner and outer ring, and movable blade is arranged on chassis 4, rotates with chassis 4, avoids the outdoor and cool exterior air of the interior gas overflowing of reaction chamber 7 to enter in reaction chamber 7.The burner hearth of tunnel kiln is divided into combustion chamber 6 and reaction chamber 7 by carborundum plate 5.
Carborundum plate is by thermal transmittance test, and its thermal conductivity reaches 96%, and carborundum plate upper surface point temperature is 1355 DEG C, conducts heat downwards by carborundum plate, and the temperature of the lower surface of this plate point is about 1300 DEG C, and almost it doesn't matter with the thickness of plate.Carborundum plate is made arc, conduct heat to reaction chamber equably for making combustion chamber, the direct direction of tipburn mouth 8 heat supplies is arc tops of carborundum plate, the side burner 9 that the interior outside of ring kiln body is arranged on 6 height of combustion chamber, and the direct direction of its heat supply is the both sides extrados of carborundum plate 12.
Continuous tunnel furnace kiln owner wants the furnace temperature of control combustion chamber 6, adopt continuously proportional control mode, the temperature of the thermopair access of combustion chamber 6 through temperature controller relatively after output (following signal system all adopts 4~20mA) control high low signal to the air on each section of house steward, the size that gas regulator is controlled valve position, thereby regulate the feed rate of air, coal gas to realize the adjusting control of temperature.The thermopair of reaction chamber 7 only for referencial use participation is controlled.
Atmosphere in the reaction chamber 7 of tunnel stove adopts variable frequency adjustment and furnace pressure variable valve dual control system, makes be controlled at+20~+ 50Pa of its room pressure left and right.CO on-line gas analysis instrument is loaded on before induced draft fan, in the time that flue gas CO exceedes prescribed value, mixes the air quantity of high-temperature flue gas section by motor valve control, and CO and oxygen are burnt again, and the CO of this part guarantees reduction effect because ensureing appropriate value.
The operation of tunnel stove adopts three grades of distributed control systems of computer, i.e. upper management level, Engineering Control level and execute-in-place level.Concentrate on on-the-spot master control room.
The high-strength mould material cast of working surface layers 16 use chromium corundum alkali resistant of chassis 4 forms, chassis 4 is done operation clockwise, bring material piece 20 with holes into tunnel furnace from feeding mouth walks reaction chamber 7, and under reducing atmosphere, be heated in material reaction chamber 7, carbon in material piece 20 coal dusts with holes and the ferric oxide in powdered iron ore carry out reduction reaction at a certain temperature, the travelling speed of chassis 4 is set by frequency conversion, and material piece 20 with holes limit in stove is heated, react on limit, limit is moved with chassis 4
From feeding mouth to discharge port, approximately through 45 minutes, complete powdered iron ore direct-reduced iron process.
Introduce the equipment of the application's the first embodiment below by specific embodiment:
As Fig. 1,3 and 4, annular tunnel kiln reaction chamber temperature is scattered in three sections, and omnidistance 45 minutes, wherein 1150 DEG C of temperature accounted for 15 minutes, and 1300 DEG C of temperature account for 25 minutes, and in stove, natural slow cooling accounts for 5 minutes.Remove 50 °, the occupy-place angle of cloth station and discharging station, the occupy-place angle of annular tunnel kiln body 8 is 310 °, meets the temperature section of reaction chamber, and the occupy-place angle that relative combustion chamber is 1200 DEG C is 90 °, the occupy-place angle that combustion chamber is 1355 DEG C is 185 °, 35 °, the occupy-place angle of natural slow cooling in stove.Tipburn mouth 8 and interior outside burner 9 lay according to this position and temperature requirement.
The material piece 20 with holes that completes reduction reaction under the delivery of chassis 4 from discharge port out, rolled by the baffle plate of spiral discharging machine, and screw blade is pushed material piece 20 with holes to discharging skewed slot, and action of gravity material piece 20 with holes falls into anti-oxidation pond 14.
The material being reduced therefrom takes out and enters fragmentation, mill selects system, through the reduction of said process again through fragmentation, mill choosing, obtain reduced iron powder one time, its result: 1) Flos Bombacis Malabarici sefstromite concentrate (iron content: 59%, titaniferous: 9%, granularity-200~100 order), coal dust (order~30, granularity-20 order), catalyzer mixes, briquetting is through above-mentioned reduction process, obtain reduced iron powder one time, iron grade is 98%, iron yield reaches 95%, residue Iron Grade of Tailings 10~15%, iron yield 3~4%, titanium grade 39~40%, mine tailing titanium yield 80%, one time reduced iron powder obtains through hydrogen reducing the secondary reduction iron powder that iron grade is greater than 99.5% in 600~800 DEG C.2) Flos Bombacis Malabarici vanadium titanium ilmenite concentrate (iron content: 33%, titaniferous: 45%, granularity-200~100 order), coal dust (order~30, granularity-20 order), catalyzer mix, briquetting is through above-mentioned reduction process, obtaining grade is 35% metallization agglomerate, metallization agglomerate obtains reduced iron powder one time through broken, ore dressing, iron grade is 94%, iron yield reaches 85%, residue Iron Grade of Tailings
5%, iron yield 10%, titanium grade 80%, mine tailing titanium yield 85%.See table:
Introduce the mode of operation of the second embodiment equipment of the present invention below:
The method and apparatus of the second powdered iron ore direct-reduction, as shown in Figure 2, Figure 3, Figure 4.Material Special purpose pressing machine 1 is also furnished with pushing device at cloth station, by material piece 20 feedings with holes in the working surface layers 16 of chassis 4, the drive unit of chassis 4 is sent into the reduction station of straight type tunnel furnace, and closure of a tunnel furnace door positions reduction to material piece 20 with holes.
The refractory materials working lining of straight type tunnel furnace chassis 4 has laid the burner port that crosses chassis 4 width, this burner port of flame positive alignment of side burner 9, the furnace roof burner 8 of combustion chamber 6 heats facing to the upper cambered surface of carborundum plate, and material piece 20 with holes is heated up and down in reaction chamber 7.
The flue gas of combustion chamber 6 and reaction chamber 7 divides two-way to fume emission passage 15, implements dedusting and heat exchange.Temperature, the same annular tunnel kiln of atmosphere control device.
Computer by Central Control Room is handled, as each burner air inlet, air intake control of valve position, make reaction chamber 7 temperature 1050~1150 DEG C and 1280~1300 DEG C of two scopes, the whole process time is 35 minutes, first temperature section 15 minutes, second temperature section is 20 minutes.
A reduction process finishes, and opens tunnel furnace fire door, and chassis 4 is driven to out material level, and pusher discharging machine 13 directly will be gone back original product and push anti-oxidation pond 14.Enter afterwards next station cloth material level, repeat an engineering.

Claims (16)

1. powdered iron ore direct reduction process, is characterized in that: comprise the following steps:
A, magnet fine mineral powder, coal dust and catalyzer are mixed;
B, the material after mixing is pressed into material piece with holes (20), on material piece with holes (20), is formed with honeycomb hole;
C, material piece with holes (20) is sent into direct-reduction in tunnel furnace, wherein linearly shape of tunnel furnace, the thermoconductive material board for burner hearth (5) of tunnel furnace separates into two-layer up and down, forms combustion chamber (6) and reaction chamber (7); Material piece with holes (20) is admitted in reaction chamber (7), utilizes the heat indirect heating material piece with holes (20) producing in combustion chamber (6).
2. the method for powdered iron ore direct-reduction claimed in claim 1, it is characterized in that: in A step, use granularity be-320~100 object v-ti magnetite concentrate powder and granularity-20~30 object coal dust and sodium salt catalyzer in mass ratio the ratio of 3~4:0.8~1.2:0.3~0.4 mix.
3. the method for powdered iron ore direct-reduction claimed in claim 1, is characterized in that: in B step, the density of described material piece with holes (20) is not less than 2.7g/cm 3, honeycomb hole aperture
4. the method for powdered iron ore direct-reduction claimed in claim 1, is characterized in that: in C step, the pressure-controlling of reaction chamber (7) is between+20~-+50Pa.
5. the method for powdered iron ore direct-reduction claimed in claim 1, it is characterized in that: in C step, one end of rectilinear tunnel furnace is provided with fire door, the other end is closed, material piece with holes (20) enters tunnel furnace and in reciprocating mode and reduces in tunnel furnace from fire door, and the material piece with holes (20) after reduction is discharged from fire door.
6. powdered iron ore equipment of direct reduction, comprise material Special purpose pressing machine (1), feed mechanism and tunnel furnace, described material Special purpose pressing machine (1) is described tunnel furnace feed by feed mechanism, described tunnel furnace comprises kiln body (2), lays the track (3) of kiln body (2), is arranged on the chassis (4) on track (3) and is laid in the firing system on kiln body (2), it is characterized in that: on the mould of described material Special purpose pressing machine (1), be provided with honeycomb hole molding structure; Linearly shape of described tunnel furnace, described tunnel furnace also comprises thermoconductive material board (5), described thermoconductive material board (5) is arranged in kiln body (2), and the burner hearth between chassis (4) table top and kiln body (2) kiln top is separated into two-layer up and down, it is at the middle and upper levels for laying the combustion chamber (6) of firing system, and lower floor is reaction chamber (7).
7. powdered iron ore equipment of direct reduction as claimed in claim 6, is characterized in that: described thermoconductive material board (5) is carborundum plate, and described carborundum plate is the domes of vault towards kiln top.
8. powdered iron ore equipment of direct reduction as claimed in claim 6, is characterized in that: the kiln body of rectilinear tunnel furnace is linear, and its one end is provided with fire door, and the other end is closed, and described chassis can move back and forth.
9. powdered iron ore equipment of direct reduction as claimed in claim 8, is characterized in that: described firing system comprises the side burner (9) that is arranged on the tipburn mouth (8) at top, combustion chamber (6) and is arranged on combustion chamber (6) outer side wall.
10. powdered iron ore equipment of direct reduction as claimed in claim 8, it is characterized in that: also comprise discharging machine (13) and anti-oxidation pond (14), described discharging machine (13) and feed mechanism are all positioned at one end of fire door all corresponding with chassis (4) table top, described discharging machine (13) arranges between feed mechanism and fire door, and the outlet of described discharging machine (13) is connected with anti-oxidation pond (14).
11. powdered iron ore equipment of direct reduction as claimed in claim 6, is characterized in that: the working surface layers (16) of described chassis (4) adopts the high-strength mould material of chromium corundum alkali resistant.
12. powdered iron ore equipment of direct reduction as claimed in claim 11, is characterized in that: in the working surface layers (16) of described chassis (4), be provided with burner port, described burner port is positioned at the sidewall of working surface layers (16).
13. powdered iron ore equipment of direct reduction as claimed in claim 6, it is characterized in that: described tunnel furnace also comprises sealing structure for water (21), described sealing structure for water (21) comprises water sealed tank, dead knife and movable blade, described water sealed tank is positioned at kiln body (2) bottom, described dead knife is fixedly mounted on kiln body (2) bottom place, described movable blade is arranged on chassis (4) bottom, and described dead knife and movable blade are by the gap coordinate to seal bottom chassis (4) and kiln body (2) with liquid in water sealed tank between.
14. powdered iron ore equipment of direct reduction as claimed in claim 13, is characterized in that: described sealing structure for water (21) also comprises dreg scraper, and described dreg scraper is arranged on movable blade bottom and is positioned at water sealed tank.
15. powdered iron ore equipment of direct reduction as claimed in claim 6, is characterized in that: described kiln body (2) is compound masonry, and its liner adopts that refractory castable is integrated poured to be formed, and the outer double-deck light lagging material that adopts carries out thermal insulation.
16. powdered iron ore equipment of direct reduction as claimed in claim 6, is characterized in that: described tunnel furnace is designed to ladder parameter type passage according to gas, pressure, temperature relation on longitudinal section.
CN201410431580.XA 2014-08-28 2014-08-28 Iron Ore Powder direct reduction process and equipment Active CN104178593B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109402317A (en) * 2017-08-18 2019-03-01 中国钢铁股份有限公司 The porous material cake high-effect metal oxide carbon thermal reduction raw metalliferous method and its used
CN112301178A (en) * 2020-11-10 2021-02-02 烟台市红森林节能环保科技有限公司 Device and method for gas-based reduction of metal oxide fine ore

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CN101497933A (en) * 2009-03-02 2009-08-05 王号德 Method for rapidly and directly reducing haematite or limonite into ferrous powder
CN101586172A (en) * 2009-07-06 2009-11-25 何德武 Method for preparing metallized pellet and reduced iron powder
CN201583129U (en) * 2010-03-19 2010-09-15 何德武 Tunnel furnace

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CN1861809A (en) * 2006-06-08 2006-11-15 王号德 Process of mfg. iron by hematite or aetite melting direct reduction
CN101157984A (en) * 2007-11-16 2008-04-09 攀枝花锐龙冶化材料开发有限公司 Method for deoxidizing vanadium-titanium ferroferrite by non-tube tunnel kiln
CN101497933A (en) * 2009-03-02 2009-08-05 王号德 Method for rapidly and directly reducing haematite or limonite into ferrous powder
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109402317A (en) * 2017-08-18 2019-03-01 中国钢铁股份有限公司 The porous material cake high-effect metal oxide carbon thermal reduction raw metalliferous method and its used
CN112301178A (en) * 2020-11-10 2021-02-02 烟台市红森林节能环保科技有限公司 Device and method for gas-based reduction of metal oxide fine ore

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