CN103282521B - The manufacture method of reduced iron and manufacturing installation - Google Patents
The manufacture method of reduced iron and manufacturing installation Download PDFInfo
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- CN103282521B CN103282521B CN201180063294.7A CN201180063294A CN103282521B CN 103282521 B CN103282521 B CN 103282521B CN 201180063294 A CN201180063294 A CN 201180063294A CN 103282521 B CN103282521 B CN 103282521B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0033—In fluidised bed furnaces or apparatus containing a dispersion of the material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
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- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention discloses a kind of manufacture method and manufacturing installation of reduced iron.The manufacture method of reduced iron of the present invention comprises step: make micro mist iron ore; And utilize reductive agent gas and reduced by the described micro mist iron ore of at least one rotary Reduction on Fluidized Bed device to powdered.By applicable the present invention, the reducing gas being rich in hydrogen can be used to reduce to impalpable powder iron ore in rotary fluidized bed reduction reactor and produce reduced iron, thus can carbonic acid gas be reduced and the impalpable powder iron ore that can reduce containing low-grade, difficult reduced ore.
Description
Technical field
The present invention relates to a kind of manufacture method of reduced iron, relate in more detail and a kind ofly make micro mist iron ore rotational flow thus manufacture the method for reduced iron.
Background technology
Since entering 21 century, along with the sustainable development of economy, the energy expenditure in the world is also in quick increase, thus the rising of the combustion cost of material in Iron industry brought exacerbates the decline of competitive power.
Particularly, the generation of the carbonic acid gas that the lasting use of fossil oil brings causes global environmental problems, and in iron and steel manufacturing process framework in the past, GOOD TASTE iron ore is day by day exhausted, both is the maximum factor that current iron and steel manufacturing process competitive power declines.
So, following technology is needed: the carbonaceous reducing agent being used for reducing iron ore producing carbonic acid gas is changed into hydrogen reduction agent in order to solve global environmental problems from source, and for iron ore, expansion uses owing to mainly existing thus abandoned in Iron industry with small-sized particle size, even if or carry out ore dressing when gangue also because it uses the technology of the atomic powder iron ore be restricted with the existence of the form of too small ultrafine particle.
In blast furnace mode in the past, the use of iron ore particles of less than 100 μm is mainly excluded in sintering circuit, or by using dropping into again in sinter machine or with the group's of burning till ball (pellet) form after the process of anticipating of agglomerating for particulate granulation ball (pellet) shape.
When dropping in blast furnace with a ball (pellet) form, its in blast furnace as hinder gas flow because usually acting on, therefore its use is restricted.In order to break away from this situation, develop using in reduced iron is produced as technology such as FINEX, FINMET, Circored of the iron powder ore directly using a few below mm.
Above-mentioned technology mainly uses reductive agent gas in the fluidized furnace (fluidizedbedfurnace) of gas sparging (bubbling) or circulation (circulating) form, makes iron powder ore carry out fluidisation, thus the technology of reducing iron ore.
But the particulate of minimum less than 100 μm still can be discharged from fluidized furnace, in order to collect these particulates, use the collection device of cyclonic separator (cyclone) etc.
Particularly, be the minimum atomic powder iron ore of less than 50 μm for size, be difficult to use without anticipating and obtain reduced iron with current technology.And, as for iron-holder lower than 60% low-grade iron ore, exist with the minimum particulate form of less than 50 μm owing to being removed the iron ore of gangue content or magnetite etc. by ore dressing, therefore removed by cyclonic separator (cyclone) in process, therefore its use is restricted.
So, the limitation needing one can overcome impalpable powder iron ore to use in the fluidized-bed reactor of blast furnace or bubbling (bubbling) form, and the new technology producing the environmental constraints of carbonic acid gas in process owing to using carbon can be solved.
Summary of the invention
Technical problem
The present invention proposes to solve the problem, its objective is the method for reducing that a kind of impalpable powder iron ore is provided, the method by the reducing gas that is rich in hydrogen in rotary fluidized bed reduction reactor to average less than 300 μm, the impalpable powder iron ore being preferably average less than 100 μm carries out reducing and producing reduced iron, thus reduction carbonic acid gas, and the impalpable powder iron ore containing low-grade, difficult reduced ore is reduced.
Technical scheme
To achieve these goals, the manufacture method of the reduced iron of the preferred embodiments of the present invention comprises step: make micro mist iron ore; And utilize reductive agent gas and reduced by the described impalpable powder iron ore of at least one rotary Reduction on Fluidized Bed device to powdered.
The step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises step: in described reducing apparatus, form centrifugal force by circular frequency, and regulates the fluidisation of the micro mist iron ore of powdered; And utilize centrifugal force and make described micro mist iron ore fluidisation and reduction by reductive agent gas.
And the described centrifugal force that described reduction step comprises by producing makes micro mist iron ore flow and carries out the step of prereduction.
And described reduction step comprises to increase all iron content, be separated and collect the step of micro mist reduced iron.
And the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises and heating and the step of spraying hydrogen.
The manufacture method of described reduced iron comprises the step that the reducing gas of discharge is circulated.
And the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises the step regulating temperature of reaction by dropping into pure oxygen.
The reduced iron manufacturing installation of another preferred embodiment of the present invention comprises: iron ore gasifying device, for regulating the particle of micro mist iron ore; And at least one rotary Reduction on Fluidized Bed device, for being reduced by the iron ore of centrifugal force to powdered.
When described rotary Reduction on Fluidized Bed device is multiple, between described multiple reducing apparatus, comprise separation and the collection device of reduced iron.
Feature of the present invention is, described rotary Reduction on Fluidized Bed device is formed with serial or parallel connection form.
Described reduced iron manufacturing installation comprises reducing gas circulation device further, circulates in described powdered device or described rotary Reduction on Fluidized Bed device for making the reducing gas of discharging from described rotary Reduction on Fluidized Bed device.
And described reduced iron manufacturing installation comprises pure oxygen throwing device further, for regulating the temperature of reaction in described rotary Reduction on Fluidized Bed device.
Beneficial effect
By applicable the present invention, can, under not carrying out pretreated situation to impalpable powder iron ore, the reductive agent being rich in hydrogen be utilized to produce reduced iron in rotary fluidized bed reduction reactor.
And the centrifugal force in rotary fluidisation improves atomic character, thus atomic releasing can be prevented, and the gas sparging in field of flow can be controlled, and improve reduction reaction speed.
And, a kind of generation of the carbonic acid gas reduced in iron-smelting process can be provided, and the impalpable powder iron ore of low-grade, difficult reduced ore can be contained and produce the efficient system of molten iron by direct-reduction.
Accompanying drawing explanation
Fig. 1 is the artwork of reduced iron manufacture method of the present invention.
Fig. 2 schematically represents the figure being blown into reducing gas and reducing to impalpable powder iron ore in rotary Reduction on Fluidized Bed device of the present invention.
Fig. 3 schematically represents the figure utilizing multiple rotary Reduction on Fluidized Bed device of the present invention to reduce to impalpable powder iron ore.
Fig. 4 be schematically represent adopt the powdered device of iron ore of the present invention, figure that multiple rotary Reduction on Fluidized Bed device reduces to impalpable powder iron ore.
Fig. 5 is the figure schematically representing configuration in parallel multiple rotary Reduction on Fluidized Bed device of the present invention and adopt heat exchanger.
Embodiment
By referring to accompanying drawing and specific embodiment described later, advantages and features of the invention and the method for reaching these advantages and feature should be able to be expressly understood.But the present invention is not limited to the embodiment of following discloses, can be implemented as various different form.Embodiments of the invention are just for intactly openly the present invention, and in order to intactly inform that category of the present invention provides to those of ordinary skill in the art, the present invention should define by the scope of claim.In specification sheets in the whole text, identical Reference numeral represents identical textural element.
Below, be described in detail with reference to the manufacture method of accompanying drawing to the reduced iron of the preferred embodiment of the present invention.It should be noted that, in explanation of the present invention, when think can unnecessarily cause main points of the present invention not known to the detailed description of relevant known function or structure time, description is omitted.
Fig. 1 is the artwork of the manufacture method of reduced iron of the present invention.
As shown in Figure 1, reduced iron manufacture method of the present invention comprises: the step S10 making micro mist iron ore; And utilize reductive agent gas and the step S20 reduced by the impalpable powder iron ore of at least one rotary Reduction on Fluidized Bed device to described powdered.
The powdered of micro mist iron ore refers to make the miniaturization of iron ore particle, utilizes turbulent flows to make the step of iron ore in iron ore gasifying device.
And the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises step: form centrifugal force by circular frequency in described reducing apparatus, and regulates the fluidisation of the micro mist iron ore of powdered; And utilize centrifugal force and by hydrogen, fluidisation and reduction carried out to described micro mist iron ore.
Formed by circular frequency and regulate the step of centrifugal force to be disengaging in order to prevent fine iron ore particle, by with the incipient fluidization speed setting circular frequency of fine iron ore particle to make the step of particulate fluidisation.
And utilizing centrifugal force and carrying out in the step of Reduction on Fluidized Bed by reductive agent gas to micro mist iron ore, the micro mist iron ore by the reductive agent gaseous exchange comprising hydrogen reduces.
Described reductive agent gas can be and comprises carbon monoxide CO, hydrogen H
2gas.
And described reduced iron manufacture method comprises to be passed through produced described centrifugal force and makes micro mist iron ore fluidisation and carry out the step of prereduction.By prereduction, the partial reduction of micro mist iron ore can be made, thus increase the efficiency of sequential reduction operation.
And, in order to increase all iron content, comprise the step being separated and collecting micro mist reduced iron.When being provided with multiple rotary Reduction on Fluidized Bed device, from gangue content, be separated in the micro mist reduced iron reduced in previous steps by centrifugal force or magnetic force, thus increase all iron content.
And, in order to increase all iron content, the step being separated or removing gangue content can be comprised.
The step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises and heating and the step of spraying hydrogen.When being blown into hydrogen reduction agent gas in rotary Reduction on Fluidized Bed device, by increasing the temperature of the hydrogen be blown into, thus be increased in reduction rate and the efficiency of the reduced iron in reducing apparatus.
And, comprise the step that the reducing gas of discharge is circulated.The reducing gas of discharging from rotary Reduction on Fluidized Bed device uses at the comminuting step of micro mist iron ore or in by the reduction step of reducing apparatus by recirculation.
And the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises the step regulating temperature of reaction by dropping into pure oxygen.Increased the temperature in reducing apparatus by input pure oxygen, thus the reduction reaction of reduced iron can be promoted further.
The reduced iron manufacturing installation of another preferred embodiment of the present invention comprises: iron ore gasifying device, for regulating the particle of micro mist iron ore; And at least one rotary Reduction on Fluidized Bed device, for being reduced by the iron ore of centrifugal force to powdered.
When described rotary Reduction on Fluidized Bed device is multiple, between described multiple reducing apparatus, comprise separation and the collection device of reduced iron.
Feature of the present invention is, described rotary Reduction on Fluidized Bed device is formed with serial or parallel connection form.
Comprising reducing gas circulation device further, circulating in described powdered device or described rotary Reduction on Fluidized Bed device for making the reducing gas of discharging from described rotary Reduction on Fluidized Bed device.
Comprise the pure oxygen throwing device for regulating the temperature of reaction in described rotary Reduction on Fluidized Bed device further.
Micro mist iron ore can be the granularity with less than 300 μm, preferably has the impalpable powder iron ore of the granularity of less than 50 μm.
In order to regulate the particulate of the micro mist iron ore as the raw material loaded before following rotary Reduction on Fluidized Bed device, described micro mist iron ore can by powdered.
The micro mist iron ore of hydrogen to described powdered is utilized to reduce by rotary Reduction on Fluidized Bed device.
In described rotary Reduction on Fluidized Bed device, except have act on common bubbling fluidization bed bioreactor gravity, also have centrifugal action except drag force (dragforces) in fluidized-bed.
In common gas-solid fluidized bed reactor, drop into reductive agent gas and can form gas sparging in reactor, thus the momentum (momentum) of the solid iron ore fluidisation made in reactor is provided, this momentum is rendered as difference and the drag force (dragforces) of the gas velocity of reducing gas and the speed of iron ore in reactor.
This drag force (dragforces) and gravity field keep balancing and realizing fluidisation, and form the suitable gas-solid mixture needed in the reaction.When the flow velocity of reductive agent increases, iron ore particles can depart from reactor thus can not participate in reduction reaction.The particulate iron ore of 100 μm that particularly cannot be reclaimed by cyclonic separator etc., especially less than 50 μm is difficult to be reduced by bubbling fluidized bed in the past.
In contrast, in the rotary fluidized bed reducing apparatus used in the present invention, centrifugal force plays and drag force (dragforces) opposite effect together with gravity, thus prevents particulate from departing from from reducing apparatus.Centrifugal force is higher can drop into more reductive agent gas, and reduces the disengaging of particulate.
And, the volume of reactor is reduced compared with bubbling fluidized bed in the past.Particularly when particulate is less than 50 μm, due to the cohesive force (cohesiveforces) acted between small particle, therefore the power of condensing each other can be strengthened, when in order to carry out fluidisation in reactor, drop into gas time, because of joint gush (slugging), channel (channeling) phenomenon is difficult to carry out fluidisation.
But when using rotary fluidized bed reactor, this GeldartC(Cohesive particulate) character of particulate changes into the character of GeldartA particulate, thus has the character of soft fluidisation.Therefore can control gas sparging in rotary fluidized bed, and increase quality and heat trnasfer (massandheattransfer) by the fluidisation of particulate, thus increase reduction reaction speed.
In rotary fluidized bed reactor, reductive agent gas drops into from the wall of the reactor rotated, and particulate iron ore drops into from the flanking central of reactor.
When using the particulate iron ore of prescribed level, iron ore its density in the process be reduced increases, and in rotary fluidized furnace, is realized the stratification of reduced iron by centrifugal force.Therefore, the reducing power that brings of reducing gas is by Fe, FeO, Fe
3o
4, Fe
2o
3this order plays a role, thus is convenient to obtain high reduction ratio.
And the field of flow not only keeping in reactor from the air-flow momentum (momentum) inside the wall side direction of reactor, and reduced iron is prevented to be attached to the phenomenon of wall.And in this rotary fluidized bed reducing apparatus, impalpable powder iron ore becomes powder or layering successively by reducing, thus can be separated the gangue content in difficult reductibility magnetite or that gangue content is many iron ore of low ore grade from the inner side of reactor.
As shown in reaction formula (1), the reductive agent gas of this reactor, by increasing the content of hydrogen, is only discharged the water of environmental sound, thus sharply can be reduced the generation of carbonic acid gas.
By hydrogen (H in high temperature more than 800 DEG C
2) reduction reaction speed faster than by the reduction reaction speed of carbon monoxide (CO), the reduced iron that the content therefore increased as the hydrogen of reduction of iron ore agent is conducive to high reduction ratio is produced.
And, when the difficult reduced ore of magnetite etc. less than 50 μm, rotary fluidized bed reducing apparatus fast restore can be used in high temperature.Bringing up to more than 800 DEG C to make the temperature of reactor and less than 1,300 DEG C, also can drop into oxygen in reactor.
In order to reduce to impalpable powder iron ore, multiple rotary fluidized bed reducing apparatus can be connected with series connection or parallel way, and in order to regulate the temperature of reducing apparatus can between rotary fluidized bed reducing apparatus or rotary fluidized bed reducing apparatus arranging heat exchangers inside.
And, for can be multiple to the reaction unit that iron ore carries out drying or prereduction before load impalpable powder iron ore in rotary fluidized bed reducing apparatus.Reaction unit can be drum (drum) shape reactor, rotary fluidized bed reactor, circular form fluidized-bed reactor or bubbling fluidized bed reactor types, and drying or prereduction can be carried out to impalpable powder iron ore in temperature below 800 DEG C or more than 800 DEG C, thus the reinforcement of the reduction of iron ore power of main rotary reaction unit is given a hand.
Below, described in detail the reduced iron manufacture method of the present invention using rotary Reduction on Fluidized Bed device by embodiment.But following embodiment just represents an example of the present invention, and content of the present invention is not limited to following embodiment.
< embodiment 1>
Fig. 2 schematically represents by being blown into hydrogen reduction agent gas 30, and the figure of the present invention process being used as rotary fluidized bed reducing apparatus 20 pairs of micro mist iron ores 10 of main reactor to reduce.
As shown in Figure 2, the rotary fluidized bed reducing apparatus 20 as main reactor for reducing to impalpable powder iron ore 10 can be set at a right angle with gravity direction or and gravity direction consistent, but also original device 20 rotates by the central shaft of reducing apparatus 20 or the mechanism giving revolving force that arranges on the outer wall of reducing apparatus 20.In the present invention, the angle of inclination of reactor is not limited to above explanation with the method giving revolving force.
The outer wall dropping into the reducing apparatus 20 of reducing gas 30 is formed with pore or graticule mesh (screen) shape, thus play the effect of the reducing gas distribution device (distributor) in fluidized-bed reactor in the past, and non-rotary, fixing outer wall also can be set outward at the outer wall of reactor drop into make reducing gas.
As shown in Figure 2, the setting of the input angle of reducing gas is not confined to reducing apparatus 20 at a right angle, can preferably tilt to the direction of dropping into impalpable powder reduced iron.The input port of reducing gas is evenly distributed on whole fixing outer wall, and its quantity and shape unrestricted, preferably between the outer wall and fixing outer wall of reactor, installation space mixes fully to enable the reducing gas of input.
Reducing gas 30 preferably exists with the reductive agent gas form being rich in hydrogen, but the form obtaining hydrogen is unrestricted, and mixing reducing gas can be by carbon monoxide, carbonic acid gas, hydrogen, oxygen, nitrogen, water (H
2etc. O) with other gas becoming to be grouped into, its shape is unrestricted, can exist with the form of a part or whole part of these mixtures.
Preferably load impalpable powder iron ore material and other solid matter for iron ore at the center of a side of rotary fluidized bed reducing apparatus 20.Surface and the position of dropping into impalpable powder iron ore can change according to the angle of reactor, turning axle etc.The impalpable powder iron ore dropped into be distributed in reducing apparatus and to carry out fluidisation and reduction by reductive agent gas, and forms balance by centrifugal force, gravity, drag force (dragforces) and other power.
The revolving force of reducing apparatus 20 is preferably greater than and the content in the minimum reducing apparatus 20 of loading and iron ore and other composition and drag force (dragforces), gravity etc. is formed balance, thus realizes the revolving force of minimal fluidisation.In addition, preferably improve revolving force, make the impalpable powder iron ore particles in reducing apparatus 20 not depart from reducing apparatus 20 together with reducing gas.
Along with the reduction of iron ore, the density of iron ore increases, thus forms the stratification of reduced iron in rotary Reduction on Fluidized Bed device 20.Therefore, will with Fe, FeO, Fe by the reducing power of reducing gas
3o
4, Fe
2o
3order play a role thus be convenient to obtain high reduction ratio.
And the field of flow not only keeping in reactor from the air-flow momentum (momentum) inside the wall side direction of reactor, and reduced iron is prevented to be attached to the phenomenon of wall side.And impalpable powder iron ore 10 becomes powder or layering successively by reducing in this rotary fluidized bed reducing apparatus 20, thus the gangue content in difficult reductibility magnetite or that gangue content is many iron ore of low ore grade can be separated from the inner side of reactor.In order to strengthen this separation phenomenon further, rotary fluidized bed reducing apparatus also can be made to use with the angular slope of regulation.
Following method can be used: bring into use the reductive agent gas being rich in carbon monoxide and the content increasing hydrogen along the direction of discharging the mixed gas after reducing gradually from the entrance dropping into iron ore, thus in high temperature, strengthen the reducing power of impalpable powder iron ore when dropping into reductive agent gas in reducing apparatus 20.
Fast by the reduction reaction speed of carbon monoxide by the reduction reaction velocity ratio of hydrogen in high temperature more than 800 DEG C, the content therefore increased as the hydrogen of reduction of iron ore agent is favourable in producing the reduced iron of high reduction ratio.And, when using the difficult reduced ore of magnetite etc. less than 50 μm, rotary fluidized bed reducing apparatus can be used, thus carry out fast restore in high temperature.
In order to the temperature of reducing apparatus 20 being brought up to more than 800 DEG C and less than 1,300 DEG C, also oxygen can be dropped in reducing apparatus 20.
Mixed gas 50 after mixing reductive agent gas after reducing to impalpable powder iron ore 10 or reduction moves to the center of reactor, and to move and outside to reactor is discharged along the central shaft of reactor.Reduced iron is discharged from rotary fluidized bed reducing apparatus by relief outlet 40.The shape of relief outlet 40 is not confined to the shape specified, and to be separated into object diametrically stratification on discharge face.According to discharge form, reactor also can be batch (batch) form or continuous form.
< embodiment 2>
Fig. 3 represents and connects plural with cascade for reducing the rotary fluidized bed reducing apparatus 20,25 of impalpable powder iron ore, thus is more convenient to device that impalpable powder iron ore 10 is reduced.
The reduced iron of discharging from the rotary fluidized bed reducing apparatus 20 previous steps again drops into and reduces in follow-up rotary fluidized bed reducing apparatus 25.Now, reduction of iron ore in follow-up rotary fluidized bed reducing apparatus 25 is the reductive agent being rich in hydrogen, more specifically, preferably be designed in reductive agent gas more than 60% for hydrogen, thus can more than 70% be obtained in high temperature more than 800 DEG C, more specifically can obtain the high reduction ratio of more than 90%.
The mixed gas of discharging from rotary fluidized bed reducing apparatus 25 is by recirculation, and the reductive agent as the iron ore in rotary fluidized bed reducing apparatus 20,25 uses.Now, the reducing power in order to strengthen rotary fluidized bed reducing apparatus 20,25 can drop into hydrogen or carbon monoxide further.
And, can gangue content from each rotary fluidized bed reducing apparatus 20,25 in separation of iron ore.Now, the gangue content tripping device (not shown) of magnetic force etc. can be utilized in the outer setting of rotary fluidized bed reducing apparatus 20,25, thus strengthen separating power.Particularly, change on the time point of magnetite at rhombohedral iron ore, or when using magnetite, the magnetic force provided from outside is highly beneficial to separation gangue content.
And, by connecting plural rotary fluidized bed reducing apparatus 20,25 in a series arrangement, thus increase continuously temperature or change temperature and pressure, and regulating the composition of reductive agent according to the reducing degree of impalpable powder iron ore.If drop into the temperature of first rotary reducing apparatus of impalpable powder iron ore below 800 DEG C, when in more detail below 600 DEG C, the reducing power of carbon monoxide is larger than the reducing power of hydrogen, make to drop in reduction reactor than hydrogen than the more carbon monoxide of hydrogen by regulating.The spread pattern of rotary fluidized bed reducing apparatus 20,25 can be the mixed form of serial or parallel connection arrangement.
< embodiment 3>
Fig. 4 schematically represents to be connected with iron ore gasifying device 5 in the front end of rotary fluidized bed reducing apparatus 20, or in order to carry out prereduction, be connected with the figure of drum (drum) shape reactor, rotary fluidized bed reducing apparatus, circular form fluid bed reduction device and bubbling fluidized bed reducing apparatus.Obtain the reduction ratio of 40% when using batch (batch) formula drum (drum) shape reactor of employing 80% hydrogen reduction agent and implement prereduction to less than 300 of 500g μm magnetites at 700 DEG C, when prereduction being implemented to the magnetite of 60 μm at 800 DEG C, obtain the reduction ratio of about 47%.
This represents, although the iron ore in drum (drum) shape reactor is not flowed by sufficient revolving force, and reductive agent gas 30 passes reactor center thus do not play sufficient reductive agent effect, also can play the effect of prereduction device.
Thus, when being substituted by rotary fluidized bed reducing apparatus or circulating fluid bed reducing apparatus, iron ore can be realized dry rapidly, and as prereduction ability, due to the increase of the contact area that the gas-solid mixing in fluid bed reduction device 20 brings, reduction reaction speed is accelerated, thus the possibility improving reducing power is higher.The reductive agent gas used in the drying and prereduction of iron ore preferably adopts the mixed gas 50 after the mixing reductive agent gas or reduction of discharging from rotary fluidized bed reducing apparatus 25.Therefore this prereduction device can be arranged on the front end of rotary fluidized bed reducing apparatus 20 shown in Fig. 2, thus contributes to the reducing power of the iron ore strengthening main rotary reactor.
< embodiment 4>
Fig. 5 is the figure representing the rotary fluidized bed reducing apparatus arranged with parallel arrangement.And Fig. 5 is the heat being schematically represented as regulating rotating type reducing apparatus, between rotary reducing apparatus or in rotary reducing apparatus, be provided with the figure of heat exchanger 130,135.Rotary fluidized bed reducing apparatus 20 not only can arrange in a series arrangement, can also parallel way arrangement, thus for the batch production of impalpable powder iron ore.The arrangement of reactor can adopt arranged in series respectively or be arranged in parallel, or can also adopt the mixed form of above-mentioned arrangement mode.
Above with reference to the accompanying drawings of embodiments of the invention, but can understand when the technician in the technical field of the invention with general knowledge and also can implement the present invention with other specific forms when not changing technological thought of the present invention and essential features.
Therefore, above-described embodiment is schematic explanation in every respect, and should not be construed as and be only limitted to this.Scope of the present invention defined by claims, instead of defined by above-mentioned detailed description, and scope of the present invention should be interpreted as comprising the whole change or deformation form that can be derived by the implication of claims and scope and its equivalents.
Claims (10)
1. a manufacture method for reduced iron, comprises the steps:
Make micro mist iron ore; And
Reduce by least one rotary Reduction on Fluidized Bed device with from the described micro mist iron ore of reductive agent gas to the powdered that the flanking central from rotary Reduction on Fluidized Bed device drops into that the wall of rotary Reduction on Fluidized Bed device drops into,
Wherein, the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises the step regulating temperature of reaction by dropping into pure oxygen,
Described rotary Reduction on Fluidized Bed device is by its central shaft or be arranged on its outer wall and the mechanism giving revolving force rotates,
When dropping into reductive agent gas in described rotary Reduction on Fluidized Bed device, increase the content of hydrogen gradually along the direction of discharging the mixed gas after reducing.
2. the manufacture method of reduced iron according to claim 1, wherein, the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises the steps:
In described reducing apparatus, form centrifugal force by circular frequency, and regulate the fluidisation of the micro mist iron ore of powdered; And
Utilize centrifugal force and make described micro mist iron ore fluidisation and reduction by reductive agent gas.
3. the manufacture method of reduced iron according to claim 2, comprises the steps:
Make micro mist iron ore fluidisation by the described centrifugal force produced and carry out prereduction.
4. the manufacture method of reduced iron according to claim 3, comprises the steps:
Be separated and collect micro mist reduced iron, to increase all iron content.
5. the manufacture method of the reduced iron according to any one in Claims 1-4, wherein, the step of being undertaken reducing by described rotary Reduction on Fluidized Bed device comprises and heating and the step of spraying hydrogen.
6. the manufacture method of the reduced iron according to any one in Claims 1-4, wherein, comprises the step that the reducing gas of discharge is circulated.
7. a reduced iron manufacturing installation, comprising:
Iron ore gasifying device, for regulating the particle of micro mist iron ore;
At least one rotary Reduction on Fluidized Bed device, for reducing by centrifugal force with from the iron ore of reductive agent gas to the powdered dropped into from its flanking central that its wall drops into; And
Pure oxygen throwing device, for regulating the temperature of reaction in described rotary Reduction on Fluidized Bed device,
Described rotary Reduction on Fluidized Bed device is by its central shaft or be arranged on its outer wall and the mechanism giving revolving force rotates,
When dropping into reductive agent gas in described rotary Reduction on Fluidized Bed device, increase the content of hydrogen gradually along the direction of discharging the mixed gas after reducing.
8. reduced iron manufacturing installation according to claim 7, wherein, when described rotary Reduction on Fluidized Bed device is multiple, comprises separation and the collection device of reduced iron between multiple described reducing apparatus.
9. the manufacturing installation of reduced iron according to claim 7, is characterized in that, described rotary Reduction on Fluidized Bed device is formed with series connection or parallel form.
10. the reduced iron manufacturing installation according to any one in claim 7 to 9, comprises further:
Reducing gas circulation device, circulates in described powdered device or described rotary Reduction on Fluidized Bed device for making the reducing gas of discharging from described rotary Reduction on Fluidized Bed device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020100137251A KR101178536B1 (en) | 2010-12-28 | 2010-12-28 | Manufacturing method for reduced iron and apparatus for manufacturing the same |
| KR10-2010-0137251 | 2010-12-28 | ||
| PCT/KR2011/007888 WO2012091265A1 (en) | 2010-12-28 | 2011-10-21 | Apparatus and method for manufacturing reduced iron |
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| Publication Number | Publication Date |
|---|---|
| CN103282521A CN103282521A (en) | 2013-09-04 |
| CN103282521B true CN103282521B (en) | 2015-12-16 |
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| CN201180063294.7A Expired - Fee Related CN103282521B (en) | 2010-12-28 | 2011-10-21 | The manufacture method of reduced iron and manufacturing installation |
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|---|---|
| KR (1) | KR101178536B1 (en) |
| CN (1) | CN103282521B (en) |
| WO (1) | WO2012091265A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| BR112022021572A2 (en) * | 2020-05-14 | 2022-12-06 | Nippon Steel Corp | METHOD TO PRODUCE REDUCED IRON |
| AU2021281774A1 (en) * | 2020-05-28 | 2022-12-01 | Nippon Steel Corporation | Method for producing reduced iron |
| JP2022157631A (en) * | 2021-03-31 | 2022-10-14 | Ｊｆｅスチール株式会社 | Manufacturing method of reduced iron, and manufacturing apparatus of reduced iron |
| WO2023173147A1 (en) * | 2022-03-10 | 2023-09-14 | Manic Iron Technology Proprietary Limited | Recovery of iron from iron ore fines using hydrogen rich gas |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109102A (en) * | 1993-08-07 | 1995-09-27 | 曼-古特霍夫农舒特有限公司 | Method and apparatus for directly deoxidation of powder mineral or fine mineral sand |
| CN101124039A (en) * | 2004-12-15 | 2008-02-13 | 阿克塞尔·德布罗克维尔 | Rotary fluidized bed device and using method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR810000840B1 (en) * | 1977-08-08 | 1981-08-07 | 오다불류 아스베크 이이휫샤 | Direct-reduction process carried out in a rotary kiln |
| JPS5849615B2 (en) | 1981-06-03 | 1983-11-05 | 中外炉工業株式会社 | Method and equipment for producing reduced iron |
| JPS5925910A (en) | 1982-08-02 | 1984-02-10 | Kawasaki Heavy Ind Ltd | Method and device for producing pure metal |
| KR101083797B1 (en) * | 2008-12-31 | 2011-11-18 | 주식회사 포스코 | Method of reduced material and apparatus for performing the same |
-
2010
- 2010-12-28 KR KR1020100137251A patent/KR101178536B1/en active IP Right Grant
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2011
- 2011-10-21 CN CN201180063294.7A patent/CN103282521B/en not_active Expired - Fee Related
- 2011-10-21 WO PCT/KR2011/007888 patent/WO2012091265A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109102A (en) * | 1993-08-07 | 1995-09-27 | 曼-古特霍夫农舒特有限公司 | Method and apparatus for directly deoxidation of powder mineral or fine mineral sand |
| CN101124039A (en) * | 2004-12-15 | 2008-02-13 | 阿克塞尔·德布罗克维尔 | Rotary fluidized bed device and using method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103282521A (en) | 2013-09-04 |
| KR20120075201A (en) | 2012-07-06 |
| WO2012091265A1 (en) | 2012-07-05 |
| KR101178536B1 (en) | 2012-08-30 |
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