CN205990414U - A kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system - Google Patents
A kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system Download PDFInfo
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Abstract
This utility model is related to chemical industry metallurgical field and in particular to a kind of direct-reduction of fume afterheat recycling type lateritic nickel ore produces granulated iron system.This system includes：Described material processing device, including the breaker being sequentially connected, screening plant and mixing arrangement, described material processing device has lateritic nickel ore entrance, reduction coal entrance, additive entrance and the outlet of aqueous mixture material；Described preheating and reduction apparatus include：Adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone and discharge zone successively；Described feed zone is provided with aqueous mixture material entrance, semi-coke entrance；Described dust arrester includes：Smoke inlet, dedusting exhanst gas outlet and dust outlet；The described gravity concentration apparatus that slightly breaks includes：Reducing material entrance, the outlet of ferronickel granulated iron and a tailings outlet；Described mill ore magnetic selection device includes：One time tailings entrance, ferronickel powder export and the outlet of secondary tailings.This system has that handling process is short, low cost, operating rate high, low power consumption and other advantages.
Description
Technical field
This utility model is related to chemical industry metallurgical field and in particular to a kind of fume afterheat recycling type lateritic nickel ore is directly gone back
Original production granulated iron system.
Background technology
Nickel is a kind of important non-ferrous metal, mainly has lateritic nickel ore and nickel sulfide ore to smelt.Due to nickel in recent years
Consumption be continuously increased and nickel sulfide ore reserves constantly reduce, the exploitation of nickel laterite is increasingly subject to pay attention to.Lateritic nickel ore
It is essentially divided into two classes, a class is limonite type, positioned at the top in mineral deposit, due to the result of weathering eluviation, ferrum is many, silicon
Few, magnesium is few, and nickel is relatively low, but amount containing cobalt is higher, and this Ore preferably adopts hydrometallurgical processes to process, the slag that smelting ferronickel produces
Production for steel；Another kind of is garnierite, positioned at the bottom in mineral deposit, due to air slaking enrichment, the many silicon of nickel minerals, many magnesium, low ferrum,
Cobalt, nickel content is higher, referred to as garnirite, and this Ore preferably adopts fire metallurgy process to process, and produces ferronickel and produces
Slag can be used for construction material and produce chemical fertilizer.The Ore being in intermediate layer can be using pyrometallurgy it is also possible to adopt
Use hydrometallurgical processes.All have the following disadvantages in process using traditional pyrometallurgical smelting ferronickel：Process environments pollute
Seriously, high energy consumption, runs counter to the restriction of national environmental protection policy and energy policy；Ore is required to have higher nickel grade；Revolution
Kiln reduction temperature is low, easy ring formation；Produce finished product nickel grade low；Low yield.In recent years, some experts and scholar propose " to use in the industry
Coal base rotary hearth furnace processes lateritic nickel ore " new method, reduction process completes in main equipment rotary hearth furnace, more ripe at present work
Skill is distributed into rotary hearth furnace after mostly being the pretreatment such as batch mixing, ball processed, drying again, and before rotary hearth furnace reduction, pretreatment process is more complicated, has
The technological process of production is long, and equipment investment is big, and production cost is high, the defect such as energy consumption height, additionally, adopting burner formula existing rotary hearth furnace more
Mode of heating, but because material enters in stove initial stage stove, Dust Capacity is larger, is easily caused burner blocking thus affecting to produce direct motion, therefore
How to design that a kind of efficiency high, equipment investment be low and energy consumption is low processes lateritic nickel ore and produce the system of granulated iron and become ability
The technical problem of domain urgent need to resolve.
Utility model content
This utility model is directed to the deficiencies in the prior art it is proposed that a kind of fume afterheat recycling type lateritic nickel ore is directly gone back
Original production granulated iron system.This system has that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, applied range
General the advantages of.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is：
The utility model proposes a kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system.According to
Embodiment of the present utility model, this system includes：Material processing device, preheating and reduction apparatus, dust arrester, slightly broken gravity treatment dress
Put and mill ore magnetic selection device, wherein：Described material processing device, including the breaker being sequentially connected, screening plant and mixing
Device, described material processing device has lateritic nickel ore entrance, reduction coal entrance, additive entrance and aqueous mixture material and goes out
Mouthful, for being mixed described lateritic nickel ore, reducing agent and additive after treatment in proportion, obtain aqueous mixture material；
Described preheating and reduction apparatus are improved rotary hearth furnace, including：Adjacent feed zone, drying tube preheating zone, side wall burn successively
Mouth reducing zone and discharge zone, wherein, are provided with partition wall between described drying tube preheating zone and described burner on sidewall reducing zone, described side
Be provided with barricade between wall burner reducing zone and described discharge zone, described partition wall and barricade by described rotary hearth furnace roof to downward
Stretch, and keep certain intervals with the cloth ring-shaped furnace bottom of described rotary hearth furnace；Wherein, it is provided with inside the furnace wall of described drying tube preheating zone
Multiple drying tubes, for heating to described drying tube preheating zone；It is provided with multiple inside the furnace wall of described burner on sidewall reducing zone
Burner, for carrying out burner mode heating to described burner on sidewall reducing zone；Described feed zone be provided with aqueous mixture material entrance,
Semi-coke entrance, described drying tube preheating zone furnace wall is provided with drying tube thermal source inlet and exhanst gas outlet, and the setting of described discharge zone is also
Raw material exports, and described aqueous mixture material entrance is connected with the aqueous mixture material outlet of described material processing device, is used for
Described aqueous mixture material is dried in described preheating and reduction apparatus, preheats and reduction treatment, obtains reducing material；
Described dust arrester includes：Smoke inlet, dedusting exhanst gas outlet and dust outlet, described smoke inlet and described preheating and reduction
The exhanst gas outlet of device is connected, and described dedusting exhanst gas outlet is connected with the drying tube thermal source inlet of described preheating and reduction apparatus；
The described gravity concentration apparatus that slightly breaks includes：Reducing material entrance, the outlet of ferronickel granulated iron and a tailings outlet, described reducing material entrance
It is connected with the reducing material outlet of described preheating and reduction apparatus, for described reducing material is slightly broken gravity treatment, obtain 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,
A described tailings entrance is connected with a described tailings outlet slightly breaking gravity concentration apparatus, for being ground a described tailings
Ore deposit magnetic separation, obtains ferronickel powder and secondary tailings.
Inventor finds, according to this system of this utility model embodiment, is all burnt using furnace wall side wall with conventional rotary hearth furnace
The mode of mouth heating is compared, and sets up drying tube preheating zone, solve material and enter the stove initial stage because of powder in rotary hearth furnace of the present utility model
The problem that dust quantity is big and leads to burner blocking；And this utility model can using wet block directly enter rotary hearth furnace flow processing red
Native nickel minerals, obtain tailings is carried out mill again and selects recovery to obtain ferronickel powder, shorten technological process, and the equipment that reduces is thrown
Money, production cost and energy consumption；Meanwhile, this utility model using be passed through after rotary hearth furnace high-temperature flue gas removing dust in drying tube make
For the thermal source of drying tube preheating zone, fume afterheat recycles, and improves equipment thermal efficiency, reduces energy consumption.Additionally, this practicality is new
Type rotary hearth furnace can adopt regenerative combustion technology, can reduce fuel cost using inferior or low-rank fuel, can at home and
Lack the area popularization of natural gas and high-grade fuel.
According to embodiment of the present utility model, described drying tube preheating zone utilizes the height that described preheating and reduction apparatus produce
After warm flue gas removing dust device is processed, it is passed through in drying tube as drying tube preheating zone heat source.
According to embodiment of the present utility model, the horizontal cross-section of described preheating and reduction apparatus is annular, described drying
Pipe preheating zone annulus angle is 30 ° -100 °.
This utility model at least has the advantages that：
1., compared with conventional rotary hearth furnace is all by the way of the heating of furnace wall burner on sidewall, increase in rotary hearth furnace of the present utility model
If drying tube preheating zone, solve the problems, such as that material enters the stove initial stage and leads to because Dust Capacity is big burner to block.
2. this utility model can directly enter the flow processing lateritic nickel ore of rotary hearth furnace using wet block, by obtain tail
Slag carries out mill again and selects recovery to obtain ferronickel powder, shortens technological process, reduces equipment investment, production cost and produces energy
Consumption.
3. this utility model is passed through in drying tube as drying tube preheating zone by the use of after rotary hearth furnace high-temperature flue gas removing dust
Thermal source, fume afterheat recycles, and improves equipment thermal efficiency, reduces energy consumption.
4. this utility model rotary hearth furnace can adopt regenerative combustion technology, can be reduced using inferior or low-rank fuel
Fuel cost, can promote with the area lacking natural gas and high-grade fuel at home.
Brief description
Fig. 1 transforms the schematic diagram of rotary hearth furnace for this utility model.
Fig. 2 is system schematic of the present utility model.
Fig. 3 is process flow diagram of the present utility model.
Wherein, feed zone 1, drying tube preheating zone 2, burner on sidewall reducing zone 3, discharge zone 4, flue 5, preheating zone and reduction
Interval partition wall 6, discharge end barricade 7, drying tube 8, burner 9, material processing device S100, lateritic nickel ore entrance 101, reduction coal enters
Mouth 102, additive entrance 103, aqueous mixture material outlet 104, preheating and reduction apparatus S200, aqueous mixture material entrance
201, semi-coke entrance 202, drying tube thermal source inlet 203, reducing material outlet 204, exhanst gas outlet 205, dust arrester S300, cigarette
Gas entrance 301, dedusting exhanst gas outlet 302, dust outlet 303, slightly breaks gravity concentration apparatus S400, reducing material entrance 401, a tail
Slag outlet 402, ferronickel granulated iron outlet 403, grind screening device S500, a tailings entrance 501, ferronickel powder outlet 504, secondary tail
Slag outlet 503.
Specific embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, with reference to specific embodiment
The utility model is described in further detail.The embodiments described below is exemplary, is only used for explaining that this practicality is new
Type, and it is not intended that to restriction of the present utility model.
The utility model proposes a kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system.According to
Embodiment of the present utility model, Fig. 1 transforms the schematic diagram of rotary hearth furnace for this utility model, and Fig. 2 shows for system of the present utility model
It is intended to, see figures.1.and.2 shown, this system includes：Material processing device S100, preheating and reduction apparatus S200, dust arrester
S300, slightly broken gravity concentration apparatus S400 and mill ore magnetic selection device S500, wherein：Described material processing device has lateritic nickel ore entrance
101st, reduction coal entrance 102, additive entrance 103 and aqueous mixture material outlet 104, for by described lateritic nickel ore, reduction
Agent and additive are mixed after treatment in proportion, obtain aqueous mixture material；Described preheating and reduction apparatus include：Successively
Adjacent feed zone 1, drying tube preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, wherein, described feed zone is provided with aqueous
Mixed material entrance 201, semi-coke entrance 202, described drying tube preheating zone furnace wall is provided with drying tube thermal source inlet 203 and flue gas
Outlet 205, described discharge zone setting reducing material outlet 204, described aqueous mixture material entrance and described material processing device
Aqueous mixture material outlet be connected, for by described aqueous mixture material described preheating and reduction apparatus in be dried,
Preheating and reduction treatment, obtain reducing material；Described reducing material obtains through described dust arrester and the described gravity concentration apparatus that slightly breaks
Ferronickel granulated iron and a tailings, then obtain ferronickel powder and secondary tailings through described mill screening device.
Inventor finds, according to this system of this utility model embodiment, is all burnt using furnace wall side wall with conventional rotary hearth furnace
The mode of mouth heating is compared, and sets up drying tube preheating zone, solve material and enter the stove initial stage because of powder in rotary hearth furnace of the present utility model
The problem that dust quantity is big and leads to burner blocking；And this utility model can using wet block directly enter rotary hearth furnace flow processing red
Native nickel minerals, obtain tailings is carried out mill again and selects recovery to obtain ferronickel powder, shorten technological process, and the equipment that reduces is thrown
Money, production cost and energy consumption；Meanwhile, this utility model using be passed through after rotary hearth furnace high-temperature flue gas removing dust in drying tube make
For the thermal source of drying tube preheating zone, fume afterheat recycles, and improves equipment thermal efficiency, reduces energy consumption.Additionally, this practicality is new
Type rotary hearth furnace can adopt regenerative combustion technology, can reduce fuel cost using inferior or low-rank fuel, can at home and
Lack the area popularization of natural gas and high-grade fuel.
According to embodiment of the present utility model, described dust arrester includes：Smoke inlet 301, dedusting exhanst gas outlet 302 and
Dust outlet 303, described smoke inlet is connected with described preheating and the exhanst gas outlet of reduction apparatus, described dedusting exhanst gas outlet and
Described preheating is connected with the drying tube thermal source inlet of reduction apparatus.
According to embodiment of the present utility model, described drying tube preheating zone utilizes the height that described preheating and reduction apparatus produce
After warm flue gas removing dust device is processed, it is passed through as drying tube preheating zone heat source in drying tube, fume afterheat recycles, carries
High equipment thermal efficiency, reduces energy consumption.
According to embodiment of the present utility model, the described gravity concentration apparatus that slightly breaks includes：401, tailings of reducing material entrance
Outlet 402 and ferronickel granulated iron outlet 403, described reducing material entrance exports phase with the reducing material of described preheating and reduction apparatus
Even, for described reducing material is slightly broken gravity treatment, ferronickel granulated iron and a tailings are obtained.
According to embodiment of the present utility model, described mill ore magnetic selection device includes：One time tailings entrance 501, ferronickel powder go out
Mouth 504 and secondary tailings outlet 503, a described tailings entrance is connected with a described tailings outlet slightly breaking gravity concentration apparatus,
For a described tailings is carried out mill ore magnetic selection, obtain ferronickel powder and secondary tailings.
According to embodiment of the present utility model, described material processing device, including the breaker being sequentially connected, screening dress
Put and mixing arrangement.
According to embodiment of the present utility model, the concrete species of described breaker is unrestricted, if can reach by
Lump material is broken into the effect of suitable particle size, can be metal breaker, stone breaker, hogging device
Or plastic crushing device, according to some embodiments of the present utility model, this utility model is preferably metal breaker or stone
Breaker.
According to embodiment of the present utility model, the concrete species of described screening plant and method are unrestricted, as long as can
Play the effect with compass screen surface with holes, mixed materials different for granule size being divided into various granularity level, can be turn
Sieve or shaking screen, independent screening, auxiliary screening or dehydration screening, according to some embodiments of the present utility model, this utility model
It is preferably revolving screen or auxiliary screening.
According to embodiment of the present utility model, described preheating and reduction apparatus are improved rotary hearth furnace, wherein, rotary hearth furnace
Concrete model unrestricted, can be heat accumulating type or non-regenerative rotary hearth furnace.According to some embodiments of the present utility model,
This utility model is preferably regenerative rotary hearth furnace, using regenerative combustion technology, can be reduced using inferior or low-rank fuel
Fuel cost, can promote with the area lacking natural gas and high-grade fuel at home.
According to embodiment of the present utility model, the concrete shape of the horizontal cross-section of described preheating and reduction apparatus is unrestricted
System, according to some embodiments of the present utility model, this utility model is preferably annular, it is furthermore preferred that the preheating of described drying tube
Area's annulus angle is 30 ° -100 °, and this utility model rotary hearth furnace drying tube preheating zone annulus angle is no less than 30 °, if annulus folder
Angle is less than 30 °, then material is too short in preheating zone remaining time, can lead to lateritic nickel ore moisture removal not exclusively, residual moisture exists
Reducing zone removing impact material area reproducibility, reduces the percent reduction of valuable metal, but when rotary hearth furnace preheating zone annulus angle is excessive
By the reduction effect of impact reducing zone material, so controlling preheating zone annulus angle to be not more than 100 °.
According to embodiment of the present utility model, this utility model passes through to set up drying tube preheating zone in rotary hearth furnace, and this is done
Dry pipe is arranged at furnace wall side wall, using heat radiation mode preheating material, is all heated using furnace wall burner on sidewall with conventional rotary hearth furnace
Mode compare, efficiently solve the problems, such as material enter the stove initial stage lead to because Dust Capacity is larger burner block, drying tube heat
Temperature be 600 DEG C -1000 DEG C, aqueous mixture material can be preheated, and effectively removing aqueous mixture material in table water and
Water of crystallization, enters stove lateritic nickel ore and typically contains the table water of 12-20% and the water of crystallization of 9-14%, will affect lateritic nickel ore if do not removed
The reduction effect of middle nickel, reduces the response rate of nickel, so can meet the reducing process of lateritic nickel ore after the preheated process of compound
Require.Pressure ball before decreasing rotary hearth furnace on the premise of not affecting product index and pelletizing stoving process, shorten technique
Flow process, reduces equipment investment, has that handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, applied range
General the advantages of.
According to embodiment of the present utility model, be provided between described drying tube preheating zone and described burner on sidewall reducing zone every
Wall 6, is provided with barricade 7, described partition wall and barricade are by described rotary hearth furnace between described burner on sidewall reducing zone and described discharge zone
Roof extend downwardly, and keep certain intervals with the cloth ring-shaped furnace bottom of described rotary hearth furnace.
According to embodiment of the present utility model, the concrete material of described preheating zone and reducing zone division wall is unrestricted, only
The effect of separation can be played, can be refractory brick or fire resisting stamp mass, according to some embodiments of the present utility model,
This utility model is preferably refractory brick.
According to embodiment of the present utility model, the concrete material of described discharge end barricade is unrestricted, as long as can play
The effect stopping, can be refractory brick or fire resisting stamp mass, according to some embodiments of the present utility model, this utility model
It is preferably refractory brick.
According to embodiment of the present utility model, described drying tube preheating zone is provided with multiple drying tubes 8, for right inside furnace wall
Described drying tube preheating zone is heated；Described burner on sidewall reducing zone is provided with multiple burners 9, for described side inside furnace wall
Wall burner reducing zone carries out burner mode heating.
According to embodiment of the present utility model, the concrete number of described drying tube and burner and shape are unrestricted, as long as
The effect of dry heat can be played, wherein, the shape of described drying tube can be p-shaped, W shape or U-shaped, according to this practicality
Some new embodiments, this utility model drying tube is preferably U-shaped.
In other side of the present utility model, this utility model provides a kind of red using foregoing system process
The method of native nickel minerals.Fig. 3 is process flow diagram of the present utility model, and with reference to shown in Fig. 3, the method comprises the following steps：
（1）Feedstock treating:Lateritic nickel ore, reducing agent and additive are mixed after crushing, sieving in proportion, is obtained
Aqueous mixture material.
According to embodiment of the present utility model, described material processing device has lateritic nickel ore entrance 101, reduction coal entrance
102nd, additive entrance 103 and aqueous mixture material outlet 104, for by described lateritic nickel ore, reducing agent and additive through place
Mixed in proportion after reason, obtained aqueous mixture material.
The concrete granularity of described lateritic nickel ore, reducing agent and additive gained raw material after crushing, sieving is unrestricted, root
According to some embodiments of the present utility model, this utility model is preferably 10-40mm.
According to embodiment of the present utility model, the concrete species of described reducing agent is unrestricted, can for coke, semicoke or
Person's reduction coal, according to some embodiments of the present utility model, this utility model is preferably reduction coal.
According to embodiment of the present utility model, raw material weight proportioning of soup processed is：Lateritic nickel ore 100 weight portion, reduction coal 10-30 weight
Amount part, additive 5-15 weight portion.
According to embodiment of the present utility model, the concrete species of described additive is unrestricted, according to of the present utility model
Some embodiments, this utility model is preferably limestone, quick lime and hydrolysis one or more of carbide slag, wherein, described adds
Plus the amount of allocating of agent will ensure basicity between 0.4-0.7, between preferably 0.5-0.6, wherein, described basicity is following four
The ratio of the mass fraction of oxide, i.e. basicity=w (MgO+CaO)/w (SiO2+ Al2O3), w is mass fraction.New in this practicality
In some embodiments of type, within this range, cinder viscosity is low for basicity, is conducive to the gathering of ferronickel granule and becomes big.
（2）Preheating, reduction and dust removal process：By semi-coke entrance, first lay in the furnace bottom of described preheating and reduction apparatus
One layer of semi-coke, then by aqueous mixture material to cloth in described preheating and reduction apparatus, with described preheating and reduction apparatus
The operating of furnace bottom, described aqueous mixture material is dried successively in drying tube preheating zone, the pre-heat treatment, then through described side wall
Carry out reduction reaction, wherein, drying tube preheating zone utilizes the high temperature cigarette that described preheating and reduction apparatus produce in burner reducing zone
After gas removing dust device is processed, it is passed through in drying tube as drying tube preheating zone heat source, then, by described reducing material
Outlet discharge obtains reducing material, carries out dust removal process to it.
According to embodiment of the present utility model, described preheating and reduction apparatus include：Adjacent successively feed zone 1, it is dried
Pipe preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, wherein, described feed zone is provided with aqueous mixture material entrance 201, orchid
Charcoal entrance 202, described drying tube preheating zone furnace wall is provided with drying tube thermal source inlet 203 and exhanst gas outlet 205, described discharge zone
Setting reducing material outlet 204, described aqueous mixture material entrance is exported with the aqueous mixture material of described material processing device
It is connected, for being dried, preheating and reduction treatment described aqueous mixture material in described preheating and reduction apparatus, obtain
Reducing material.
According to embodiment of the present utility model, described dust arrester includes：Smoke inlet 301, dedusting exhanst gas outlet 302 and
Dust outlet 303, described smoke inlet is connected with described preheating and the exhanst gas outlet of reduction apparatus, described dedusting exhanst gas outlet and
Described preheating is connected with the drying tube thermal source inlet of reduction apparatus.
According to embodiment of the present utility model, the rotary furnace bottom of described transformation will be covered with one layer of semi-coke, and thickness is preferably
5-15mm, because the temperature of lateritic nickel ore direct-reduction production granulated iron technique is higher, slag is in half molten state, in order to prevent half
The slag bonding furnace bottom impact discharging of molten condition, so complete one layer of semi-coke in rotary furnace bottom in advance to facilitate discharging.
According to embodiment of the present utility model, described drying tube preheating zone utilizes the height that described preheating and reduction apparatus produce
After warm flue gas removing dust device is processed, it is passed through as drying tube preheating zone heat source in drying tube, fume afterheat recycles, carries
High equipment thermal efficiency, reduces energy consumption.
According to embodiment of the present utility model, the temperature of the drying tube preheating zone heating of described preheating and reduction apparatus is
600 DEG C -1000 DEG C, the time is 20-40min；Described reducing zone adopt burner on sidewall mode of heating, reduction temperature be 1350 DEG C-
1450 DEG C, the time is 20-50min.
In some embodiments of the present utility model, 1350 ~ 1450 DEG C of reduction temperature, can smoothly produce granulated iron, temperature
Too low one side reduction reaction is not thorough, and nickel recovery is low, and another aspect slag viscosity is big, and ferronickel is not easy to assemble, and temperature is too high
Ferrum can be made to melt, so that carbon is floated, unfavorable to reducing, now in slag, FeO content is high, and bits do not stick, be difficult to form granulated iron.
（3）Slightly break re-selection process：Described reducing material is slightly broken re-selection process, is obtained ferronickel granulated iron and a tail
Slag.
According to embodiment of the present utility model, the described gravity concentration apparatus that slightly breaks includes：401, tailings of reducing material entrance
Outlet 402 and ferronickel granulated iron outlet 403, described reducing material entrance exports phase with the reducing material of described preheating and reduction apparatus
Even, for described reducing material is slightly broken gravity treatment, ferronickel granulated iron and a tailings are obtained.
（4）Mill ore magnetic selection is processed：A described tailings is carried out mill ore magnetic selection process, obtains ferronickel powder and secondary tailings.
According to embodiment of the present utility model, described mill ore magnetic selection device includes：One time tailings entrance 501, ferronickel powder go out
Mouth 504 and secondary tailings outlet 503, a described tailings entrance is connected with a described tailings outlet slightly breaking gravity concentration apparatus,
For a described tailings is carried out mill ore magnetic selection, obtain ferronickel powder and secondary tailings.
Embodiment 1
From TFe20.6%, the lateritic nickel ore containing Ni 1.65%, as raw material, crushes, is sized to 10-40mm, according to red
Native nickel minerals 100 weight portion, reduction coal 10 weight portion, the part by weight dispensing of quick lime 5 weight portion simultaneously mixes, and is entered by semi-coke
Mouthful, first lay one layer of semi-coke in the furnace bottom of described preheating and reduction apparatus, then aqueous mixture material to described preheating and is gone back
Cloth in original device, with the operating of described preheating and reduction apparatus furnace bottom, described aqueous mixture material is pre- in drying tube successively
Be dried in hot-zone, the pre-heat treatment, then carry out reduction reaction through in described burner on sidewall reducing zone, wherein, drying tube preheats
After area utilizes the high-temperature flue gas removing dust device process that described preheating and reduction apparatus produce, it is passed through in drying tube as drying tube
Preheating zone heat source, fume afterheat recycles, and then, exports discharge by described reducing material and obtains reducing material, to it
Carry out dust removal process, wherein, set up drying tube preheating zone in rotary hearth furnace, the temperature of heating is 600 DEG C, and the time is 40min；Also
Former area adopts outboard sidewalls burner mode of heating, and rotary furnace bottom is distributed into one layer of 5mm thickness semi-coke prior to dry bulb group, and reduction temperature is
1350 DEG C, the time is 50min, and the annulus angle of preheating zone is 30 °；The reducing material that rotary hearth furnace discharging obtains is sent into and is slightly broken gravity treatment
The ferronickel granulated iron that re-selection process obtains mean diameter 3mm is slightly broken in device（Containing Ni 7.56%, Fe 89.58%）With a tail
Slag, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes obtaining ferronickel powder（Containing Ni 4.65% TFe
63.52%）With secondary tailings, whole flow process nickel recovery 94%.
Embodiment 2
From TFe18.7%, the lateritic nickel ore containing Ni 1.76%, as raw material, crushes, is sized to 10-40mm, according to red
Native nickel minerals 100 weight portion, reduction coal 20 weight portion, the part by weight dispensing of limestone 10 weight portion simultaneously mixes, and is entered by semi-coke
Mouthful, first lay one layer of semi-coke in the furnace bottom of described preheating and reduction apparatus, then aqueous mixture material to described preheating and is gone back
Cloth in original device, with the operating of described preheating and reduction apparatus furnace bottom, described aqueous mixture material is pre- in drying tube successively
Be dried in hot-zone, the pre-heat treatment, then carry out reduction reaction through in described burner on sidewall reducing zone, wherein, drying tube preheats
After area utilizes the high-temperature flue gas removing dust device process that described preheating and reduction apparatus produce, it is passed through in drying tube as drying tube
Preheating zone heat source, fume afterheat recycles, and then, exports discharge by described reducing material and obtains reducing material, to it
Carry out dust removal process, wherein, set up drying tube preheating zone in rotary hearth furnace, the temperature of heating is 800 DEG C, and the time is 30min；Also
Former area adopts outboard sidewalls burner mode of heating, and rotary furnace bottom is distributed into one layer of 5mm thickness semi-coke prior to dry bulb group, and reduction temperature is
1400 DEG C, the time is 30min, and the annulus angle of preheating zone is 60 °；The reducing material that rotary hearth furnace discharging obtains is sent into and is slightly broken gravity treatment
The ferronickel granulated iron that re-selection process obtains mean diameter 4mm is slightly broken in device（Containing Ni 7.68%, Fe 90.16%）With a tail
Slag, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes obtaining ferronickel powder（Containing Ni 6.03% TFe
65.76%）With secondary tailings, whole flow process nickel recovery 96%.
Embodiment 3
From TFe29.6%, the lateritic nickel ore containing Ni 1.46%, as raw material, crushes、It is sized to 10-40mm, according to red
Native nickel minerals 100 weight portion, reduction coal 30 weight portion, the part by weight dispensing of hydrolysis carbide slag 15 weight portion simultaneously mixes, by orchid
Charcoal entrance, first lays one layer of semi-coke in the furnace bottom of described preheating and reduction apparatus, then by aqueous mixture material to described preheating
With cloth in reduction apparatus, with the operating of described preheating and reduction apparatus furnace bottom, described aqueous mixture material is being dried successively
Pipe is dried in preheating zone, the pre-heat treatment, then carries out reduction reaction, wherein, drying tube through in described burner on sidewall reducing zone
After preheating zone utilizes the high-temperature flue gas removing dust device process that described preheating and reduction apparatus produce, it is passed through in drying tube as dry
Dry pipe preheating zone heat source, fume afterheat recycles, and then, exports discharge by described reducing material and obtains reducing material,
Dust removal process is carried out to it, wherein, sets up drying tube preheating zone in rotary hearth furnace, the temperature of heating is 1000 DEG C, the time is
20min；Reducing zone adopts outboard sidewalls burner mode of heating, and rotary furnace bottom is distributed into one layer of 5mm thickness semi-coke prior to dry bulb group, also
Former temperature is 1450 DEG C, and the time is 20min, and the annulus angle of preheating zone is 100 °；The reducing material water that rotary hearth furnace discharging obtains
Send into slightly to break in gravity concentration apparatus and slightly broken the ferronickel granulated iron that re-selection process obtains mean diameter 2.5mm（Containing Ni 6.33%, Fe
90.89%）With a tailings, tailings is re-fed into mill ore magnetic selection equipment to carry out mill ore magnetic selection and processes obtaining ferronickel powder（Containing Ni
4.56% TFe 68.56%）With secondary tailings, whole flow process nickel recovery 95%.
Inventor finds, according to this system of this utility model embodiment, is all burnt using furnace wall side wall with conventional rotary hearth furnace
The mode of mouth heating is compared, and sets up drying tube preheating zone, solve material and enter the stove initial stage because of powder in rotary hearth furnace of the present utility model
The problem that dust quantity is big and leads to burner blocking；And this utility model can using wet block directly enter rotary hearth furnace flow processing red
Native nickel minerals, obtain tailings is carried out mill again and selects recovery to obtain ferronickel powder, shorten technological process, and the equipment that reduces is thrown
Money, production cost and energy consumption；Meanwhile, this utility model using be passed through after rotary hearth furnace high-temperature flue gas removing dust in drying tube make
For the thermal source of drying tube preheating zone, fume afterheat recycles, and improves equipment thermal efficiency, reduces energy consumption.Additionally, this practicality is new
Type rotary hearth furnace can adopt regenerative combustion technology, can reduce fuel cost using inferior or low-rank fuel, can at home and
Lack the area popularization of natural gas and high-grade fuel.
In the description of this specification, reference term " embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features, the knot describing with reference to this embodiment or example
Structure, material or feature are contained at least one embodiment of the present utility model or example.In this manual, to above-mentioned art
The schematic representation of language is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or
Person's feature can combine in any one or more embodiments or example in an appropriate manner.
It is to be understood that term " first ", " second " are only used for describing purpose in description of the present utility model, and
It is not intended that instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define
The feature of " first ", " second " can be expressed or implicitly include one or more this feature.Of the present utility model
In description, unless otherwise stated, " multiple " are meant that two or more.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " being connected ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly
Connect；Can be to be mechanically connected or point connection；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning in this utility model for the language.
Although of the present utility model embodiment has been shown and described above it is to be understood that above-described embodiment is
Exemplary it is impossible to be interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
Interior above-described embodiment can be changed, change, replacing and modification, simultaneously for one of ordinary skill in the art, foundation
The thought of the application, all will change in specific embodiments and applications.
Claims (3)
1. a kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system it is characterised in that including：At raw material
Reason device, preheating and reduction apparatus, dust arrester, slightly broken gravity concentration apparatus and mill ore magnetic selection device, wherein：
Described material processing device, including the breaker being sequentially connected, screening plant and mixing arrangement, described Feedstock treating dress
Put with the outlet of lateritic nickel ore entrance, reduction coal entrance, additive entrance and aqueous mixture material, for by described laterite nickel
Ore deposit, reducing agent and additive are mixed after treatment in proportion, obtain aqueous mixture material；
Described preheating and reduction apparatus are improved rotary hearth furnace, including：Adjacent feed zone, drying tube preheating zone, side successively
Wall burner reducing zone and discharge zone, wherein, are provided with partition wall between described drying tube preheating zone and described burner on sidewall reducing zone, institute
State and between burner on sidewall reducing zone and described discharge zone, be provided with barricade, described partition wall and barricade by described rotary hearth furnace roof to
Lower extension, and keep certain intervals with the cloth ring-shaped furnace bottom of described rotary hearth furnace；Wherein, inside the furnace wall of described drying tube preheating zone
It is provided with multiple drying tubes, for heating to described drying tube preheating zone；Described burner on sidewall reducing zone is provided with inside furnace wall
Multiple burners, for carrying out burner mode heating to described burner on sidewall reducing zone；Described feed zone is provided with aqueous mixture material
Entrance, semi-coke entrance, described drying tube preheating zone furnace wall is provided with drying tube thermal source inlet and exhanst gas outlet, and described discharge zone sets
Put reducing material outlet, described aqueous mixture material entrance is connected with the aqueous mixture material outlet of described material processing device,
For being dried, preheating and reduction treatment described aqueous mixture material in described preheating and reduction apparatus, reduced
Material；
Described dust arrester includes：Smoke inlet, dedusting exhanst gas outlet and dust outlet, described smoke inlet with described preheating and
The exhanst gas outlet of reduction apparatus is connected, described dedusting exhanst gas outlet with described preheat and reduction apparatus drying tube thermal source inlet phase
Even；
The described gravity concentration apparatus that slightly breaks includes：Reducing material entrance, the outlet of ferronickel granulated iron and a tailings outlet, described reducing material
Entrance is connected with the reducing material outlet of described preheating and reduction apparatus, for slightly described reducing material is broken gravity treatment, obtains
To ferronickel granulated iron and a tailings；
Described mill ore magnetic selection device includes：One time tailings entrance, ferronickel powder export and the outlet of secondary tailings, a described tailings
Entrance is connected with a described tailings outlet slightly breaking gravity concentration apparatus, for a described tailings is carried out mill ore magnetic selection, obtains
Ferronickel powder and secondary tailings.
2. system according to claim 1 is it is characterised in that described drying tube preheating zone utilizes described preheating and also original-pack
After putting the high-temperature flue gas removing dust device process of generation, it is passed through in drying tube as drying tube preheating zone heat source.
3. system according to claim 1 is it is characterised in that the horizontal cross-section of described preheating and reduction apparatus is annulus
Shape, described drying tube preheating zone annulus angle is 30 ° -100 °.
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| CN106222353A (en) * | 2016-09-13 | 2016-12-14 | 江苏省冶金设计院有限公司 | A kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system and method |
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| CN106222353A (en) * | 2016-09-13 | 2016-12-14 | 江苏省冶金设计院有限公司 | A kind of fume afterheat recycling type lateritic nickel ore direct-reduction produces granulated iron system and method |
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