CN106222355A - The pyrolysis of a kind of high efficiente callback lateritic nickel ore dry bulb group and reduction reaction system and method - Google Patents
The pyrolysis of a kind of high efficiente callback lateritic nickel ore dry bulb group and reduction reaction system and method Download PDFInfo
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- CN106222355A CN106222355A CN201610819262.XA CN201610819262A CN106222355A CN 106222355 A CN106222355 A CN 106222355A CN 201610819262 A CN201610819262 A CN 201610819262A CN 106222355 A CN106222355 A CN 106222355A
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- pyrolysis
- lateritic nickel
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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
Abstract
The present invention relates to chemical industry metallurgical field, be specifically related to a kind of system and method utilizing lateritic nickel ore pyrolysis and reduction reaction.The problem processing the petroleum resources not accounted in lateritic nickel ore technology in Direct Reduction reclaims reduction coal for existing rotary hearth furnace, the present invention provides the pyrolysis and reduction reaction system and method that a kind of high efficiente callback lateritic nickel ore dry bulb rolls into a ball, and realizes pyrolysis and the reduction melting of lateritic nickel ore of coal during lateritic nickel ore coal-based direct reduction.This system can achieve the pyrolysis of coal at lateritic nickel ore Direct Reduction, makes the petroleum resources of preciousness be reclaimed, thus, increase the side-product of rotary hearth furnace coal-based DR process, lower process energy consumption and cost.Meanwhile, semicoke after pyrolysis continues to participate in the direct reduction reactor of lateritic nickel ore in rotary hearth furnace and obtains metallized pellet.Further, described metallized pellet is through twice recycling so that the response rate of lateritic nickel ore increases, hereby it is achieved that the high efficiente callback of lateritic nickel ore.
Description
Technical field
The present invention relates to chemical industry metallurgical field.In particular it relates to one utilizes lateritic nickel ore pyrolysis and reduction
The system and method for reaction.
Background technology
In recent years, along with the exhausted of high-grade nickel sulfide ore and the fast development of domestic rustless steel industry, low-grade laterite
Nickel minerals has become as the primary raw material producing ferro-nickel product.In order to solve the Rational Utilization of lateritic nickel ore, with lateritic nickel ore
For raw material, coal dust is reducing agent, uses direct-reduction process that the ferrum in Ore and nickel have been reduced into metallic iron and metallic nickel, then warp
Superfusion point or mill choosing make nickel be enriched in ferro-nickel product.
Now, coal-based DR process has multiple, and wherein, owing to rotary hearth furnace reduction technique has, equipment is simple, operation
Easily, with short production cycle, response speed fast, advantages of environment protection, so rotary hearth furnace reduction technique has caused widely
Pay close attention to.The ultimate principle of rotary hearth iron making is that the high temperature of flame is passed by radiation by being positioned at the burning of the flat flame burner of furnace sidewall
To the pelletizing on bed of material surface, the metal-oxide in carbonaceous pelletizing is made at high temperature to be reduced, heating energy source many employings natural gas,
Cracked gas, coke-stove gas, coal gas of converter and coal gas etc., energy sources is quite varied.Use rotary hearth furnace equipment DRI
(DRI) technique mainly comprises the steps that and Iron Ore Powder is mixed homogeneously with reducing agent coal dust, is pressed into carbonaceous pelletizing ore deposit, dries；
Dry carbonaceous pelletizing is layered on rotary hearth furnace equably, make carbonaceous pelletizing reduced zone in rotary hearth furnace (temperature up to
1300 DEG C～1400 DEG C) in be reduced 15min-30min, i.e. can get the metallized pellet that degree of metalization is more than 85%.Turn
End furnace apparatus is for the advantage producing DRI, the transfixion that reduction temperature is high, the time is short, furnace charge is relative with furnace bottom holding,
Thus avoid the problems such as rotary kiln, fluid bed bonding, shaft furnace dross.Chinese patent CN102212636A discloses a kind of laterite
The iron smelting method that point stove melts point is melted in nickel minerals rotary hearth furnace coal-based direct reduction combustion gas, after being mixed with coal and flux by lateritic nickel ore
Pelletizing, dry bulb carries out direct-reduction and obtains metallized pellet in being distributed into rotary hearth furnace, metallized pellet feeding coal gas makees fuel
The molten point stove of regenerative gas carries out molten point, finally gives nickelic dilval.
But, existing rotary hearth furnace processes in lateritic nickel ore technology and yet suffers from some problems.Reduction coal dust is at lateritic nickel ore
Rotary hearth furnace Direct Reduction only serves reduction mineral and the effect of part supply heat, the oil gas of self preciousness
Resource does not obtain more efficiently utilization.Therefore, existing rotary hearth furnace process lateritic nickel ore technology is further improved.
Summary of the invention
Process in lateritic nickel ore technology for existing rotary hearth furnace and do not account in Direct Reduction reclaims reduction coal
The problem of petroleum resources, the present invention provides the pyrolysis and reduction reaction system and side that a kind of high efficiente callback lateritic nickel ore dry bulb rolls into a ball
Method, realizes pyrolysis and the reduction melting of lateritic nickel ore of coal during lateritic nickel ore coal-based direct reduction.This system can
Achieve the pyrolysis of coal at lateritic nickel ore Direct Reduction, make the petroleum resources of preciousness be reclaimed, thus, add and turn the end
The side-product of stove coal-based DR process, reduces process energy consumption and cost.Meanwhile, the semicoke after pyrolysis continues at rotary hearth furnace
The direct reduction reactor of interior participation lateritic nickel ore obtains metallized pellet.Further, described metallized pellet is at twice recovery
Reason so that the response rate of lateritic nickel ore increases, and thus, this system achieves the high efficiente callback of lateritic nickel ore.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The invention provides pyrolysis and the reduction reaction system of a kind of high efficiente callback lateritic nickel ore dry bulb group.Reality according to the present invention
Executing example, this system includes: dispensing mixing device, shaped device, drying device, have pyrolysis and the rotary hearth furnace of restoring function, oil
Gas recovering device, thick broken gravity concentration apparatus and mill ore magnetic selection device, wherein:
Described dispensing mixing device includes: lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material outlet, uses
In lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, obtain mixed material；
Described shaped device includes: mixed material entrance and mixing pelletizing outlet, described mixed material entrance and described mixture
Material outlet is connected, and for described mixed material is shaped process, obtains mixing pelletizing；
Described drying device includes: mixing pelletizing entrance and the outlet of dry bulb group, described mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and for described mixing pelletizing is dried process, obtains dry bulb group；
The described rotary hearth furnace with pyrolysis and restoring function includes: the most adjacent feed zone, pyrolysis zone, reducing zone and discharging
District, wherein, described pyrolysis zone respectively and is provided with partition wall between described feed zone, described reducing zone, described reducing zone with described go out
Between material district, to be provided with barricade, described partition wall and described barricade be all to be downwardly extended by the roof of described rotary hearth furnace, and with described turn
The cloth tray of end stove keeps certain intervals；Wherein, described pyrolysis zone is provided with and multiple adds heat pipe, for adding described pyrolysis zone
Heat pipe mode heats；Described reducing zone is provided with multiple burner, for described reducing zone carries out burner mode heating；Described charging
Furnace wall, district is provided with dry bulb group's entrance and semi-coke entrance, and furnace wall, described pyrolysis zone is provided with pyrolysis oil gas vent, described discharge zone
Furnace wall is provided with metallized pellet outlet, and described dry bulb group entrance exports with described dry bulb group and is connected；
Described device for recovering oil and gas includes: pyrolysis oil gas entrance, tar outlet and gas outlet, described pyrolysis oil gas entrance and institute
The pyrolysis oil gas vent stating rotary hearth furnace is connected, and for being collected and separating treatment by pyrolysis oil gas, obtains tar and combustion gas；
Described thick broken gravity concentration apparatus includes: the outlet of metallized pellet entrance, ferronickel granulated iron and a tailings outlet, described metallization
Pelletizing entrance is connected with the outlet of described metallized pellet, for described metallized pellet is slightly broken re-selection process, obtains nickel
Abrasive grit ferrum and a tailings；
Described mill ore magnetic selection device includes: one time tailings entrance, ferronickel powder export and the outlet of secondary tailings, and a described tailings enters
Mouth is connected with described tailings outlet, for a described tailings is carried out mill ore magnetic selection process, obtains ferronickel powder and secondary
Tailings.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, it is possible to direct at lateritic nickel ore
Reduction process achieves the pyrolysis of coal, makes the petroleum resources of preciousness be reclaimed, adds rotary hearth furnace coal-based DR process
Side-product, reduce process energy consumption and cost.Meanwhile, the semicoke after pyrolysis continues to participate in the straight of lateritic nickel ore in rotary hearth furnace
Connect reduction reaction and obtain metallized pellet, and, metallized pellet is through twice recycling so that the response rate of lateritic nickel ore
Increasing, thus, this system achieves the high efficiente callback of lateritic nickel ore.
According to embodiments of the invention, described in there is pyrolysis and restoring function the horizontal cross-section of rotary hearth furnace be annular,
The annulus angle 30-100 of described pyrolysis zone.
According to embodiments of the invention, described in there is pyrolysis and restoring function the horizontal cross-section of rotary hearth furnace be annular,
The annulus angle 240-300 of described reducing zone.
In another aspect of the present invention, the invention provides one utilize foregoing system carry out lateritic nickel ore do
Ball pyrolysis and the method for reduction reaction, comprise the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, obtain mixture
Material；
(2) mixed material adds shaped device be shaped processing, obtain mixing pelletizing；
(3) mixing pelletizing addition drying device is dried process, obtains dry bulb group；
(4) dry bulb group is joined have pyrolysis and restoring function rotary hearth furnace in carry out being pyrolyzed and reduction treatment, be pyrolyzed
Oil gas and metallized pellet；
(5) metallized pellet is added thick broken gravity concentration apparatus and slightly break re-selection process, obtain ferronickel granulated iron and a tailings；
(6) tailings is added mill ore magnetic selection device and carry out mill ore magnetic selection process, obtain ferronickel powder and secondary tailings.
According to embodiments of the invention, the reduction coal in described step (1) is middle low-order coal, and volatile matter is not less than 20%, excellent
Select brown coal.
According to embodiments of the invention, the weight proportion of lateritic nickel ore, reduction coal and additive in described step (1) is
Lateritic nickel ore: reduction coal: additive=100:5-25:3-15.
According to embodiments of the invention, in described step (1), the amount of allocating into the basicity to be ensured of additive is at 0.4-0.7, excellent
Selecting 0.5-0.6, wherein, basicity isw(MgO+CaO)/w(SiO2+Al2O3 ),wFor mass fraction.
According to embodiments of the invention, the furnace bottom of the rotary hearth furnace in described step (4) with pyrolysis and restoring function to spread
There are one layer of semi-coke, thickness 5-15mm.
According to embodiments of the invention, in described step (4), dry bulb group enters at the rotary hearth furnace with pyrolysis and restoring function
The reaction temperature of row pyrolysis and reduction treatment is: pyrolysis temperature 400-900 DEG C, reduction temperature 1350-1450 DEG C.
The beneficial effects of the present invention is:
(1) pyrolysis of the high efficiente callback lateritic nickel ore dry bulb group that the present invention provides and reduction reaction system and method, it is possible to red
Soil nickel minerals Direct Reduction realizes the pyrolysis of coal so that valuable petroleum resources is able to recovery, and to add rotary hearth furnace coal base straight
Connect the side-product of reducing process, thus, reduce process energy consumption and cost.
(2) pyrolysis of the high efficiente callback lateritic nickel ore dry bulb group that the present invention provides and reduction reaction system and method, pyrolysis
After semicoke continue to participate in the direct reduction reactor of lateritic nickel ore in rotary hearth furnace, thus, obtain metallized pellet.
(3) pyrolysis of the high efficiente callback lateritic nickel ore dry bulb group that the present invention provides and reduction reaction system and method, this is
The metallized pellet that system obtains is through twice recycling so that the response rate of lateritic nickel ore increases, and thus, this system is real
Show the high efficiente callback of lateritic nickel ore.
Accompanying drawing explanation
Fig. 1 is the structure chart of the present invention.
Fig. 2 is the simple diagram of the present invention.
Fig. 3 is the workflow knot figure of the present invention.
Wherein, 10, add heat pipe, 20, partition wall, 30, burner, 40, barricade, 100, dispensing mixing device, 101, lateritic nickel ore
Entrance, 102, reduction coal entrance, 103, additive entrance, 104, mixed material outlet, 200, shaped device, 201, mixed material
Entrance, 202, mixing pelletizing outlet, 300, drying device, 301, mixing pelletizing entrance, 302, the outlet of dry bulb group, 400, have also
Former and the rotary hearth furnace of pyrolysis function, 401, dry bulb group entrance, 402, semi-coke entrance, 403, pyrolysis oil gas vent, 404, metallization
Pelletizing exports, and 500, device for recovering oil and gas, 501, pyrolysis oil gas entrance, 502, tar outlet, 503, gas outlet, 600, slightly break
Gravity concentration apparatus, 601, metallized pellet entrance, 602, tailings outlet, 603, the outlet of ferronickel granulated iron, 700, mill ore magnetic selection dress
Put, 701, tailings entrance, 702, ferronickel powder outlet, 703, secondary tailings outlet.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, and is not understood that
For limitation of the present invention.Unreceipted concrete technology or condition in embodiment, according to the skill described by the document in this area
Art or condition or carry out according to product description.
According to an aspect of the present invention, the invention provides the pyrolysis of a kind of high efficiente callback lateritic nickel ore dry bulb group and go back
Former response system.According to embodiments of the invention, the pyrolysis of high efficiente callback lateritic nickel ore dry bulb of the present invention group and reduction reaction system
The structure chart of system, as it is shown in figure 1, this system includes: dispensing mixing device 100, shaped device 200, drying device 300, have
Pyrolysis and the rotary hearth furnace 400 of restoring function, device for recovering oil and gas 500, thick broken gravity concentration apparatus 600 and mill ore magnetic selection device 700.Figure
2 be high efficiente callback lateritic nickel ore dry bulb of the present invention group pyrolysis and the simple diagram of reduction reaction system, as in figure 2 it is shown, described in join
Material mixing device includes: lateritic nickel ore entrance 101, reduction coal entrance 102, additive entrance 103 and mixed material outlet 104,
For lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, obtain mixed material；Described shaped device includes:
Mixed material entrance 201 and mixing pelletizing outlet 202, described mixed material entrance is connected with the outlet of described mixed material, is used for
It is shaped described mixed material processing, obtains mixing pelletizing；Described drying device includes: mixing pelletizing entrance 301 is with dry
Pelletizing outlet 302, described mixing pelletizing entrance is connected with the outlet of described mixing pelletizing, for being dried by described mixing pelletizing
Process, obtain dry bulb group；Described have pyrolysis and the rotary hearth furnace of restoring function includes: the most adjacent feed zone, pyrolysis zone, also
Former district and discharge zone；Described device for recovering oil and gas includes: pyrolysis oil gas entrance 501, tar outlet 502 and gas outlet 503, institute
State pyrolysis oil gas entrance to be connected with the pyrolysis oil gas vent of described rotary hearth furnace, for being collected and at separation by pyrolysis oil gas
Reason, obtains tar and combustion gas；Described thick broken gravity concentration apparatus includes: 601, the tailings outlet 602 of metallized pellet entrance and nickel
Abrasive grit ferrum outlet 603, described metallized pellet entrance is connected with the outlet of described metallized pellet, for by described metallized pellet
Slightly break re-selection process, obtain ferronickel granulated iron and a tailings；Described mill ore magnetic selection device includes: tailings entrance 701,
Ferronickel powder outlet 702 and secondary tailings outlet 703, a described tailings entrance is connected with described tailings outlet, and being used for will
A described tailings carries out mill ore magnetic selection process, obtains ferronickel powder and secondary tailings.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, it is possible to direct at lateritic nickel ore
Reduction process achieves the pyrolysis of coal, makes the petroleum resources of preciousness be reclaimed, adds rotary hearth furnace coal-based DR process
Side-product, reduce process energy consumption and cost.Meanwhile, the semicoke after pyrolysis continues to participate in the straight of lateritic nickel ore in rotary hearth furnace
Connect reduction reaction and obtain metallized pellet, and, metallized pellet is through twice recycling so that the response rate of lateritic nickel ore
Increasing, thus, this system achieves the high efficiente callback of lateritic nickel ore.
According to a particular embodiment of the invention, as it is shown in figure 1, described in there is pyrolysis and the rotary hearth furnace of restoring function includes:
The most adjacent feed zone, pyrolysis zone, reducing zone and discharge zone, wherein, described pyrolysis zone respectively with described feed zone, described also
It is provided with partition wall 20 between former district, is provided with barricade 40, described partition wall and described barricade between described reducing zone and described discharge zone equal
It is to be downwardly extended by the roof of described rotary hearth furnace, and keeps certain intervals with the cloth tray of described rotary hearth furnace.Thus, described reduction
Barricade between district and discharge zone can separate Liang Ge district effectively, it is possible to ensures that reducing zone atmosphere is stable.
According to a particular embodiment of the invention, described feed zone furnace wall is provided with dry bulb group's entrance 401 and semi-coke entrance
402, described dry bulb group entrance exports with described dry bulb group and is connected, and described dry bulb group's entrance and semi-coke entrance are respectively used to dry bulb
Group and semi-coke are reacted in adding described rotary hearth furnace；Furnace wall, described pyrolysis zone is provided with pyrolysis oil gas vent 403, for by heat
Solve oil gas and discharge described rotary hearth furnace；Furnace wall, described discharge zone is provided with metallized pellet outlet 404, for being arranged by metallized pellet
Go out.
According to a particular embodiment of the invention, the concrete shape of the rotary hearth furnace described in pyrolysis and restoring function is not had
Body limits, as long as being capable of being pyrolyzed lateritic nickel ore dry bulb group and reduction reaction.Some enforcements in the present invention
In example, described in have the horizontal cross-section of rotary hearth furnace of pyrolysis and restoring function be annular, and, the annulus folder shared by each district
Angle is not particularly limited.Preferably, the annulus angle 30-100 of described pyrolysis zone, the annulus angle 240 of described reducing zone-
300, it is ensured that good pyrolysis effect and reduction effect.
According to a particular embodiment of the invention, there is described in the heating side of the pyrolysis zone of the rotary hearth furnace of pyrolysis and restoring function
Formula is the most particularly limited, as long as hot charge can be added.In some embodiments of the invention, described pyrolysis zone uses and adds
The mode of heat pipe 10 heats, further, described in add heat pipe and may be mounted at described pyrolysis zone, multiple heating can be set
Pipe 10.Thus, it is achieved that the raw material of described pyrolysis zone is heated.
According to a particular embodiment of the invention, there is described in the heating side of the reducing zone of the rotary hearth furnace of pyrolysis and restoring function
Formula is the most particularly limited, as long as hot charge can be added.In some embodiments of the invention, described reducing zone uses and burns
The mode of mouth 30 heats, and further, described burner may be mounted at described reducing zone, can arrange multiple burner 30.
In some embodiments of the invention, the heat using burner combustion to produce passes to pelletizing by the way of radiant heat transfer.
Because the burning of burner naked light has the advantage (up to 1500 DEG C) that burning capacity is big, heating-up temperature is high, thus, it is achieved that to institute
The raw material stating reducing zone heats.
According to a particular embodiment of the invention, this system includes described device for recovering oil and gas, as long as can be to pyrolysis oil gas
Carry out reclaiming.In some embodiments of the invention, described device for recovering oil and gas includes: pyrolysis oil gas entrance, tar go out
Mouth and gas outlet, described pyrolysis oil gas entrance is connected with the pyrolysis oil gas vent of described rotary hearth furnace, for being entered by pyrolysis oil gas
Row is collected and separating treatment, obtains tar and combustion gas.Thus, effectively carry out described rotary hearth furnace produces dust-laden pyrolysis oil gas
Recycling so that valuable petroleum resources is reclaimed, thus, add the by-product of rotary hearth furnace coal-based DR process
Product, reduce process energy consumption and cost indirectly.
According to a particular embodiment of the invention, this system includes described thick broken gravity concentration apparatus, as long as can be by described metal
Pellet slightly breaks re-selection process.In some embodiments of the invention, described thick broken gravity concentration apparatus includes: metallization
The outlet of pelletizing entrance, ferronickel granulated iron and a tailings outlet, described metallized pellet entrance exports phase with described metallized pellet
Even, for described metallized pellet is slightly broken re-selection process, ferronickel granulated iron and a tailings are obtained.
According to a particular embodiment of the invention, this system includes described mill ore magnetic selection device, if can by described once
Tailings carries out mill ore magnetic selection and processes.In some embodiments of the invention, described mill ore magnetic selection device includes: a tailings
The outlet of entrance, ferronickel powder and the outlet of secondary tailings, a described tailings entrance is connected, for by institute with described tailings outlet
State a tailings and carry out mill ore magnetic selection process, obtain ferronickel powder and secondary tailings.Thus, this system achieves the height of lateritic nickel ore
Effect reclaims.
According to embodiments of the invention, the lateritic nickel ore in described system is not subject to the weight proportion of reduction coal and additive
Concrete restriction.In some embodiments of the invention, the lateritic nickel ore in described system and reduction coal and the weight of additive
Proportioning is lateritic nickel ore: reduction coal: additive=100:5-25:3-15.Further, the amount of allocating into of described additive to ensure
Basicity is at 0.4-0.7, it is preferred that basicity is 0.5-0.6.Wherein, basicity isw(MgO+CaO)/w(SiO2+Al2O3 ),wFor matter
Amount mark.Because basicity keeps within the above range, and cinder viscosity can be made low, thus, the beneficially gathering of ferronickel granule and length
Greatly.
According to embodiments of the invention, reduction coal and the kind of additive in described system are the most particularly limited, only
Can be used in carrying out reacting.In some embodiments of the invention, described reduction coal is middle low-order coal, described additive
For limestone or Calx.Further, the volatile matter of described reduction coal is not less than 20%, it is preferred that for brown coal.
According to embodiments of the invention, described in there is pyrolysis and restoring function the furnace bottom of rotary hearth furnace can be covered with one layer of orchid
Charcoal, it is preferred that the thickness of described semi-coke is 5-15mm.Because the temperature that lateritic nickel ore direct-reduction produces granulated iron technique is higher,
Make slag in half molten state and be bonded in furnace bottom and affect discharging.So, the furnace bottom at rotary hearth furnace completes one layer of semi-coke in advance,
Thus, the slag that effectively prevent semi-molten state is bonded in furnace bottom, facilitates discharging.
In another aspect of the present invention, the invention provides one utilize foregoing system carry out lateritic nickel ore do
Ball pyrolysis and the method for reduction reaction, Fig. 3 is the workflow knot figure of the present invention, as it is shown on figure 3, comprise the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, obtain mixture
Material.
According to embodiments of the invention, described system includes dispensing mixing device, is used for lateritic nickel ore, reduction coal and adds
Add agent and carry out batch mixing and dispensing process, obtain mixed material.In some embodiments of the invention, the laterite nickel in described system
Ore deposit is lateritic nickel ore with the weight proportion of reduction coal and additive: reduction coal: additive=100:5-25:3-15.Further,
The amount of allocating into the basicity to be ensured of described additive is at 0.4-0.7, and wherein, basicity isw(MgO+CaO)/w(SiO2+Al2O3 ),wFor
Mass fraction, it is preferred that basicity is 0.5-0.6.Because basicity keeps within the above range, and cinder viscosity can be made low, thus,
Be conducive to the gathering of ferronickel granule and grow up.
According to embodiments of the invention, reduction coal and the kind of additive in described system are the most particularly limited, only
Can be used in carrying out pyrolytic reaction.In some embodiments of the invention, described reduction coal is middle low-order coal, described in add
Adding agent is limestone or Calx.Further, the volatile matter of described reduction coal is not less than 20%, it is preferred that for brown coal.
(2) mixed material adds shaped device be shaped processing, obtain mixing pelletizing.
(3) mixing pelletizing addition drying device is dried process, obtains dry bulb group.
(4) dry bulb group is joined have pyrolysis and restoring function rotary hearth furnace in carry out being pyrolyzed and reduction treatment, obtain
Pyrolysis oil gas and metallized pellet.
According to a particular embodiment of the invention, the rotary hearth furnace described in pyrolysis and restoring function includes: the most adjacent
Feed zone, pyrolysis zone, reducing zone and discharge zone, wherein, described pyrolysis zone respectively and sets between described feed zone, described reducing zone
Having partition wall, being provided with barricade, described partition wall and described barricade between described reducing zone and described discharge zone is all by described rotary hearth furnace
Roof downwardly extend, and keep certain intervals with the cloth tray of described rotary hearth furnace.Described dry bulb group described have pyrolysis and
The rotary hearth furnace of restoring function carries out the reaction temperature of pyrolysis and reduction treatment: pyrolysis temperature 400-900 DEG C of pyrolysis zone, in institute
State reduction coal pyrolysis zone rolled into a ball by described dry bulb carry out pyrolysis processing obtain be pyrolyzed oil gas；The reduction temperature 1350-of reducing zone
1450 DEG C, in described reducing zone, the pelletizing after pyrolysis is reduced, to reach good reduction effect, finally give metallization
Pelletizing discharges rotary hearth furnace in discharge zone.Thus, this system can achieve the pyrolysis of coal at lateritic nickel ore Direct Reduction, and
And, the semicoke after pyrolysis continues to participate in the direct reduction reactor of lateritic nickel ore in rotary hearth furnace and obtains metallized pellet.
This system includes described device for recovering oil and gas, for by described rotary hearth furnace produce pyrolysis oil gas be collected and
Separating treatment, obtains tar and combustion gas, thus so that valuable petroleum resources is reclaimed, thus, add rotary hearth furnace coal base
The side-product of direct-reduction technique, reduces process energy consumption and cost indirectly.Meanwhile, have described in pyrolysis and restoring function turn
The furnace bottom of end stove to be covered with one layer of semi-coke, thickness 5-15mm, thus, the slag that effectively prevent semi-molten state is bonded in stove
The end, facilitate discharging.
(5) metallized pellet is added thick broken gravity concentration apparatus and slightly break re-selection process, obtain ferronickel granulated iron and a tail
Slag.
According to a particular embodiment of the invention, described thick broken gravity concentration apparatus for carrying out thick broken weight by described metallized pellet
Choosing processes, and obtains ferronickel granulated iron and a tailings.Thus, this system achieves the efficient recovery of lateritic nickel ore, has obtained ferronickel
Granulated iron.
(6) tailings is added mill ore magnetic selection device and carry out mill ore magnetic selection process, obtain ferronickel powder and secondary tailings.
According to a particular embodiment of the invention, described mill ore magnetic selection device, for carrying out ore grinding magnetic by a described tailings
Choosing processes, and obtains ferronickel powder and secondary tailings.Thus, this system, by the recycling to a tailings, has obtained ferronickel powder, real
Show the high efficiente callback of lateritic nickel ore.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, it is possible to direct at lateritic nickel ore
Reduction process achieves the pyrolysis of coal, makes the petroleum resources of preciousness be reclaimed, adds rotary hearth furnace coal-based DR process
Side-product, reduce process energy consumption and cost.Meanwhile, the semicoke after pyrolysis continues to participate in the straight of lateritic nickel ore in rotary hearth furnace
Connect reduction reaction and obtain metallized pellet, and, metallized pellet is through twice recycling so that the response rate of lateritic nickel ore
Increasing, thus, this system achieves the high efficiente callback of lateritic nickel ore.
Embodiment 1
By lateritic nickel ore (containing Ni 1.85%), bituminous coal (volatile matter 25%) and sodium carbonate 100:10:5 in mass ratio at blend ingredients
Carry out dispensing in device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Pelletizing, is then dried mixing pelletizing process in drying device and obtains dry bulb group (aqueous 1.0%), then by dry bulb group
Carrying out being pyrolyzed and reduction treatment in having the rotary hearth furnace of pyrolysis and restoring function, rotary furnace bottom is distributed into one layer prior to dry bulb group
5mm thickness semi-coke, the annulus angle 30 of pyrolysis zone, pyrolysis zone temperature 500 DEG C, the annulus angle 300 of reducing zone, reducing zone temperature
1350 DEG C, pyrolysis and the complete pyrolysis oil gas obtained of reduction reaction are processed by device for recovering oil and gas and obtain tar and combustion gas, metal
Pellet send into thick broken gravity concentration apparatus slightly breaks re-selection process obtain mean diameter 3mm ferronickel granulated iron (containing Ni 8.56%,
Fe 90.48%) an and tailings, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes and obtain ferronickel powder and (contain
Ni 4.61%, TFe 62.72%) and secondary tailings, whole flow process nickel recovery 95%.
Embodiment 2
By lateritic nickel ore (containing Ni 2.45%), brown coal (volatile matter 40%) and limestone 100:15:15 in mass ratio at blend ingredients
Carry out dispensing in device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Pelletizing, is then dried mixing pelletizing process in drying device and obtains dry bulb group (aqueous 1.5%), by dry bulb group at tool
Having in the rotary hearth furnace of pyrolysis and restoring function and carry out being pyrolyzed and reduction treatment, rotary furnace bottom is distributed into one layer of 10mm prior to dry bulb group
Thick semi-coke, the annulus angle 60 of pyrolysis zone, pyrolysis zone temperature 700 DEG C, the annulus angle 270 of reducing zone, reducing zone temperature
1400 DEG C, pyrolysis and the complete pyrolysis oil gas obtained of reduction reaction are processed by device for recovering oil and gas and obtain tar and combustion gas, metal
Pellet send into thick broken gravity concentration apparatus slightly breaks re-selection process obtain mean diameter 4mm ferronickel granulated iron (containing Ni 7.53%,
Fe 91.81%) an and tailings, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes and obtain ferronickel powder and (contain
Ni 5.82%, TFe 64.67%) and secondary tailings, whole flow process nickel recovery 96%.
Embodiment 3
By lateritic nickel ore (containing Ni 1.12%), ub-bituminous coal (volatile matter 35%) and Calx 100:25:9 in mass ratio at blend ingredients
Carry out dispensing in device, mixing treatment obtains mixed material, and mixed material is shaped process in shaped device and is mixed
Pelletizing, is then dried mixing pelletizing process in drying device and obtains dry bulb group (aqueous 0.5%), by dry bulb group at tool
Having in the rotary hearth furnace of pyrolysis and restoring function and carry out being pyrolyzed and reduction treatment, rotary furnace bottom is distributed into one layer of 15mm prior to dry bulb group
Thick semi-coke, the annulus angle 90 of pyrolysis zone, pyrolysis zone temperature 900 DEG C, reducing zone temperature 1450 DEG C, the annulus angle of reducing zone
240, pyrolysis and the complete pyrolysis oil gas obtained of reduction reaction are processed by device for recovering oil and gas and obtain tar and combustion gas, metallization
Pelletizing send into thick broken gravity concentration apparatus slightly breaks re-selection process obtain mean diameter 2.5mm ferronickel granulated iron (containing Ni 6.23%,
Fe 92.72%) an and tailings, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes and obtain ferronickel powder and (contain
Ni 3.83%, TFe 73.83%) and secondary tailings, whole flow process nickel recovery 97%.
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the
One ", the feature of " second " can express or implicitly include one or more this feature.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc.
Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral；Can be that machinery connects
Connect, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements
The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible
It is that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy
Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary
Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the technology of this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be combined by personnel
And combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example
Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, revises, replaces and modification, simultaneously for one of ordinary skill in the art, according to the think of of the application
Think, the most all will change.
Claims (9)
1. the pyrolysis of high efficiente callback lateritic nickel ore dry bulb group and reduction reaction system, it is characterised in that including: dispensing batch mixing
Device, shaped device, drying device, have pyrolysis and the rotary hearth furnace of restoring function, device for recovering oil and gas, thick broken gravity concentration apparatus and
Mill ore magnetic selection device, wherein:
Described dispensing mixing device includes: lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material outlet, uses
In lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, obtain mixed material；
Described shaped device includes: mixed material entrance and mixing pelletizing outlet, described mixed material entrance and described mixture
Material outlet is connected, and for described mixed material is shaped process, obtains mixing pelletizing；
Described drying device includes: mixing pelletizing entrance and the outlet of dry bulb group, described mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and for described mixing pelletizing is dried process, obtains dry bulb group；
The described rotary hearth furnace with pyrolysis and restoring function includes: the most adjacent feed zone, pyrolysis zone, reducing zone and discharging
District, wherein, described pyrolysis zone respectively and is provided with partition wall between described feed zone, described reducing zone, described reducing zone with described go out
Between material district, to be provided with barricade, described partition wall and described barricade be all to be downwardly extended by the roof of described rotary hearth furnace, and with described turn
The cloth tray of end stove keeps certain intervals；Wherein, described pyrolysis zone is provided with and multiple adds heat pipe, for adding described pyrolysis zone
Heat pipe mode heats；Described reducing zone is provided with multiple burner, for described reducing zone carries out burner mode heating；Described charging
Furnace wall, district is provided with dry bulb group's entrance and semi-coke entrance, and furnace wall, described pyrolysis zone is provided with pyrolysis oil gas vent, described discharge zone
Furnace wall is provided with metallized pellet outlet, and described dry bulb group entrance exports with described dry bulb group and is connected；
Described device for recovering oil and gas includes: pyrolysis oil gas entrance, tar outlet and gas outlet, described pyrolysis oil gas entrance and institute
The pyrolysis oil gas vent stating rotary hearth furnace is connected, and for being collected and separating treatment by pyrolysis oil gas, obtains tar and combustion gas；
Described thick broken gravity concentration apparatus includes: the outlet of metallized pellet entrance, ferronickel granulated iron and a tailings outlet, described metallization
Pelletizing entrance is connected with the outlet of described metallized pellet, for described metallized pellet is slightly broken re-selection process, obtains nickel
Abrasive grit ferrum and a tailings；
Described mill ore magnetic selection device includes: one time tailings entrance, ferronickel powder export and the outlet of secondary tailings, and a described tailings enters
Mouth is connected with described tailings outlet, for a described tailings is carried out mill ore magnetic selection process, obtains ferronickel powder and secondary
Tailings.
System the most according to claim 1, it is characterised in that described in there is the level of rotary hearth furnace of pyrolysis and restoring function
Cross section is annular, the annulus angle 30-100 of described pyrolysis zone.
System the most according to claim 1, it is characterised in that described in there is the level of rotary hearth furnace of pyrolysis and restoring function
Cross section is annular, the annulus angle 240-300 of described reducing zone.
4. the system utilized according to any one of claim 1-3 carries out the pyrolysis of lateritic nickel ore dry bulb and the side of reduction reaction
Method, it is characterised in that comprise the following steps:
(1) lateritic nickel ore, reduction coal and additive addition dispensing mixing device is carried out batch mixing and dispensing processes, obtain mixture
Material；
(2) mixed material adds shaped device be shaped processing, obtain mixing pelletizing；
(3) mixing pelletizing addition drying device is dried process, obtains dry bulb group；
(4) dry bulb group is joined have pyrolysis and restoring function rotary hearth furnace in carry out being pyrolyzed and reduction treatment, be pyrolyzed
Oil gas and metallized pellet；
(5) metallized pellet is added thick broken gravity concentration apparatus and slightly break re-selection process, obtain ferronickel granulated iron and a tailings；
(6) tailings is added mill ore magnetic selection device and carry out mill ore magnetic selection process, obtain ferronickel powder and secondary tailings.
Method the most according to claim 4, it is characterised in that the reduction coal in described step (1) is middle low-order coal, volatilization
Divide and be not less than 20%, preferably brown coal.
Method the most according to claim 4, it is characterised in that lateritic nickel ore, reduction coal and the interpolation in described step (1)
The weight proportion of agent is lateritic nickel ore: reduction coal: additive=100:5-25:3-15.
Method the most according to claim 4, it is characterised in that the amount of allocating into the alkali to be ensured of additive in described step (1)
Degree is at 0.4-0.7, and preferably 0.5-0.6, wherein, basicity isw(MgO+CaO)/w(SiO2+Al2O3 ), w is mass fraction.
Method the most according to claim 4, it is characterised in that described step (4) has pyrolysis and restoring function turn
The furnace bottom of end stove to be covered with one layer of semi-coke, thickness 5-15mm.
Method the most according to claim 4, it is characterised in that in described step (4), dry bulb group has pyrolysis and reduction
The rotary hearth furnace of function carries out the reaction temperature of pyrolysis and reduction treatment: pyrolysis temperature 400-900 DEG C, reduction temperature 1350-
1450℃。
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Cited By (1)
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| CN106811594A (en) * | 2017-03-24 | 2017-06-09 | 江苏省冶金设计院有限公司 | The system and method for processing vanadium titano-magnetite |
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Application publication date: 20161214 |