CN106191464B - A kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and method - Google Patents
A kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and method Download PDFInfo
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- CN106191464B CN106191464B CN201610819162.7A CN201610819162A CN106191464B CN 106191464 B CN106191464 B CN 106191464B CN 201610819162 A CN201610819162 A CN 201610819162A CN 106191464 B CN106191464 B CN 106191464B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/021—Obtaining nickel or cobalt by dry processes by reduction in solid state, e.g. by segregation processes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/04—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of powdered coal
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/005—Preliminary treatment of ores, e.g. by roasting or by the Krupp-Renn process
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
- C22B23/023—Obtaining nickel or cobalt by dry processes with formation of ferro-nickel or ferro-cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/10—Dry methods smelting of sulfides or formation of mattes by solid carbonaceous reducing agents
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Abstract
The present invention relates to chemical industry metallurgical fields, and in particular to a kind of to utilize lateritic nickel ore pyrolysis and the system and method for reduction reaction.The petroleum resources not accounted in lateritic nickel ore technology in Direct Reduction recycles reduction coal are handled for existing rotary hearth furnace, the present invention proposes a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and method, to realize the reduction melting of the pyrolysis of the coal during lateritic nickel ore coal-based direct reduction and lateritic nickel ore.The system can realize the pyrolysis of coal in lateritic nickel ore Direct Reduction, and valuable petroleum resources is enable to recycle, so as to increase the byproduct of rotary hearth furnace coal-based DR process, reduce process energy consumption and cost.Meanwhile the direct reduction reactor of participation lateritic nickel ore in rotary hearth furnace of the semicoke continuation after pyrolysis obtains metallized pellet.
Description
Technical field
The present invention relates to chemical industry metallurgical fields.In particular it relates to a kind of be pyrolyzed and restored using lateritic nickel ore
The system and method for reaction.
Background technology
In recent years, with the fast development of the exhausted and domestic stainless steel industry of high-grade nickel sulfide ore, low-grade laterite
Nickel minerals has become the primary raw material of production 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, and the iron in ore and nickel have been reduced into metallic iron and metallic nickel, then pass through using direct-reduction process
Superfusion point or mill choosing make nickel be enriched in ferro-nickel product.
Now, there are many coal-based DR process, wherein, since rotary hearth furnace reduction technique has, equipment is simple, operates
Easily, with short production cycle, reaction speed is fast, advantages of environment protection, so rotary hearth furnace reduction technique has caused widely
Concern.The basic principle of rotary hearth iron making is burnt by being located at the flat flame burner of furnace sidewall, and the high temperature of flame is passed by radiating
Be fed layer surface pelletizing, the metal oxide in carbonaceous pelletizing is made to be reduced at high temperature, heating energy source mostly using natural gas,
Cracked gas, coke-stove gas, coal gas of converter and coal gas etc., energy sources are very extensive.Using rotary hearth furnace equipment direct reduced iron
(DRI) technique mainly includes the following steps that：Iron Ore Powder with reducing agent coal dust is uniformly mixed, is pressed into carbonaceous pelletizing ore deposit, is dried；
Dry carbonaceous pelletizing is equably layered on rotary hearth furnace, making reduced zone of the carbonaceous pelletizing in rotary hearth furnace, (temperature is reachable
1300 DEG C~1400 DEG C) in be reduced 15min-30min, you can obtain degree of metalization be more than 85% metallized pellet.Turn
Bottom furnace apparatus is for the advantages of producing DRI, and reduction temperature is high, the time is short, furnace charge and furnace bottom keep opposite stationary,
The problems such as so as to avoid rotary kiln, fluid bed bonding, shaft furnace dross.Chinese patent CN 102212636A disclose a kind of red
The iron smelting method that point stove melts point is melted in native nickel minerals rotary hearth furnace coal-based direct reduction-combustion gas, and lateritic nickel ore is mixed with coal and fluxing agent
Pelletizing afterwards, dry bulb, which is distributed into rotary hearth furnace, to be reduced directly to obtain metallized pellet, and metallized pellet feeding coal gas makees fuel
Regenerative gas melt point stove and carry out molten point, finally obtain nickelic dilval.
But still have some problems in existing rotary hearth furnace processing lateritic nickel ore technology.Coal dust is restored in lateritic nickel ore
It is only to play the role of restoring mineral and part supply heat, itself valuable oil gas in rotary hearth furnace Direct Reduction
Resource does not obtain more efficiently utilization.Therefore, existing rotary hearth furnace processing lateritic nickel ore technology is further improved.
Invention content
It handles and is not accounted in lateritic nickel ore technology in Direct Reduction recycles reduction coal for existing rotary hearth furnace
Petroleum resources, the present invention proposes a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and method, to realize laterite nickel
The pyrolysis of coal during pit coal base directly reducing and the reduction melting of lateritic nickel ore.The system can be in lateritic nickel ore directly also
Former process realizes the pyrolysis of coal, and valuable petroleum resources is enable to recycle, so as to increase rotary hearth furnace coal-based direct reduction work
The byproduct of skill, reduces process energy consumption and cost.Meanwhile the semicoke after pyrolysis continues to participate in lateritic nickel ore in rotary hearth furnace
Direct reduction reactor obtains metallized pellet.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
The present invention provides a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction systems, which is characterized in that including：Match
Expect mixing device, molding machine, drying device, there is rotary hearth furnace, device for recovering oil and gas and the slag iron of pyrolysis and restoring function point
From device；
The dispensing mixing device includes：Lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material go out
Mouthful, for lateritic nickel ore, reduction coal and additive to be carried out dispensing mixing treatment, obtain mixed material；
The molding machine includes：Mixed material entrance and the outlet of mixing pelletizing, the mixed material entrance are mixed with described
It closes material outlet to be connected, for the mixed material to be carried out forming processes, obtains mixing pelletizing；
The drying device includes：Pelletizing entrance and the outlet of dry bulb group are mixed, the mixing pelletizing entrance is mixed with described
Pelletizing outlet is connected, and for the mixing pelletizing to be dried processing, obtains dry bulb group；
The rotary hearth furnace for having pyrolysis and restoring function includes：Adjacent feed zone, pyrolysis zone, reducing zone and go out successively
Expect area, wherein, the pyrolysis zone respectively between the feed zone, the reducing zone be equipped with partition wall, the reducing zone with it is described
Between discharge zone be equipped with barricade, the partition wall with the barricade is extended downwardly by the roof of the rotary hearth furnace, and with it is described
The cloth tray of rotary hearth furnace keeps certain intervals；Wherein, multiple heating tubes are equipped on the inside of the pyrolysis zone furnace wall, for the heat
Xie Qu carries out heating tube mode heating；Multiple burners are equipped on the inside of the reducing zone furnace wall, for being burnt to the reducing zone
Mouth mode heats；The feed zone furnace wall is equipped with dry bulb and rolls into a ball entrance, and the pyrolysis zone furnace wall is equipped with pyrolysis oil gas vent, institute
It states discharge zone furnace wall to export equipped with metallized pellet, dry bulb group's entrance is exported with dry bulb group to be connected；
The device for recovering oil and gas includes：It is pyrolyzed oil gas entrance, tar outlet and gas outlet, the pyrolysis oil gas entrance
It is connected with the pyrolysis oil gas vent, for the pyrolysis oil gas to be collected and separating treatment, obtains tar and combustion gas；
The slag sluicing system device includes：Metallized pellet entrance, ferro-nickel product outlet and tailings outlet, the metallization
Pelletizing entrance is connected with metallized pellet outlet, for the metallized pellet to be carried out slag sluicing system processing, obtains nickel
Iron product and tailings.
Inventor has found that simple in structure according to the system in the embodiment of the present invention, easy to operate, which can be in laterite nickel
Ore deposit Direct Reduction realizes the pyrolysis of coal, and valuable petroleum resources is enable to recycle, so as to which it is straight to increase rotary hearth furnace coal base
The byproduct of reducing process is connect, reduces process energy consumption and cost.Meanwhile after pyrolysis semicoke continuation participated in rotary hearth furnace it is red
The direct reduction reactor of native nickel minerals obtains metallized pellet.
According to an embodiment of the invention, the horizontal cross-section of the rotary hearth furnace with pyrolysis and restoring function is circular ring shape,
The annulus angle 30o-100o of the pyrolysis zone.
According to an embodiment of the invention, the horizontal cross-section of the rotary hearth furnace with pyrolysis and restoring function is circular ring shape,
The annulus angle 240o-300o of the reducing zone.
In another aspect of the present invention, lateritic nickel ore heat is carried out using foregoing system the present invention provides a kind of
The method of solution and reduction reaction, which is characterized in that include the following steps：
（1）Lateritic nickel ore, reduction coal and additive are added in into dispensing mixing device and carry out batch mixing and dispensing processing, is mixed
Close material；
（2）Mixed material is added in into molding machine and carries out forming processes, obtains mixing pelletizing；
（3）Mixing pelletizing is added in into drying device, processing is dried, obtain dry bulb group；
（4）Dry bulb group is added in the rotary hearth furnace with pyrolysis and restoring function and is pyrolyzed and reduction treatment, is obtained
It is pyrolyzed oil gas and metallized pellet；
（5）Metallized pellet is added in into slag sluicing system device and carries out slag sluicing system processing, obtains ferro-nickel product and tailings.
According to an embodiment of the invention, the step（1）In reduction coal for middle low-order coal, volatile matter is not less than 20%, excellent
Select lignite.
According to an embodiment of the invention, the step（1）In additive be selected from alkali metal oxide, alkali metal salt,
At least one of alkaline earth oxide and alkali salt.
According to an embodiment of the invention, the step（1）In lateritic nickel ore and reduction coal and additive weight proportion
For lateritic nickel ore：Reduction coal：Additive=100：10-40：3-15.
According to an embodiment of the invention, the step（4）Middle dry bulb group the rotary hearth furnace with pyrolysis and restoring function into
Row pyrolysis and the reaction temperature of reduction treatment are：400-900 DEG C of pyrolysis temperature, 1000-1400 DEG C of reduction temperature.
The beneficial effects of the present invention are：
（1）The present invention provides a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and methods, can be red
The pyrolysis of coal is realized in native nickel minerals Direct Reduction so that valuable petroleum resources are able to recycling, and to increase rotary hearth furnace coal base straight
The byproduct of reducing process is connect, so as to reduce process energy consumption and cost.
（2）The pyrolysis rolled into a ball the present invention provides a kind of lateritic nickel ore dry bulb and reduction reaction system and method, after pyrolysis
Semicoke continues to participate in the direct reduction reactor of lateritic nickel ore in rotary hearth furnace, obtains metallized pellet.
（3）The present invention provides a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system and methods, can utilize
Middle low-order coal carries out the direct-reduction production of lateritic nickel ore, reduces production cost.
Description of the drawings
Fig. 1 is the pyrolysis of lateritic nickel ore dry bulb of the present invention group and the structure chart of reduction reaction system.
Fig. 2 is the pyrolysis of lateritic nickel ore dry bulb of the present invention group and the simple diagram of reduction reaction system.
Fig. 3 is the pyrolysis of lateritic nickel ore dry bulb of the present invention group and the work flow diagram of reduction reaction system.
Wherein, 10, heating tube, 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, molding machine, 201, mixed material
Entrance, 202, the outlet of mixing pelletizing, 300, drying device, 301, mixing pelletizing entrance, 302, the outlet of dry bulb group, 400, there is heat
Solution and restoring function rotary hearth furnace, 401, dry bulb group entrance, 402, pyrolysis oil gas vent, 403, metallized pellet outlet, 500,
Device for recovering oil and gas, 501, pyrolysis oil gas entrance, 502, tar outlet, 503, gas outlet, 600, slag sluicing system device, 601,
Metallized pellet entrance, 602, ferro-nickel product outlet, 603, tailings outlet.
Specific embodiment
In order to which those skilled in the art is made to more fully understand technical scheme of the present invention, with reference to specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, and is only used for explaining the present invention, without being understood that
For limitation of the present invention.Particular technique or condition are not specified in embodiment, according to the described skill of document in the art
Art or condition are carried out according to product description.
According to an aspect of the present invention, the present invention provides a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction systems
System, structure as shown in Figure 1, including：Dispensing mixing device 100, drying device 300, has pyrolysis and goes back molding machine 200
Rotary hearth furnace 400, device for recovering oil and gas 500 and the slag sluicing system device 600 of former function.Fig. 2 is lateritic nickel ore dry bulb group of the present invention
Pyrolysis and reduction reaction system simple diagram, as shown in the figure, the dispensing mixing device includes：Lateritic nickel ore entrance 101 is gone back
Raw coal entrance 102, additive entrance 103 and mixed material outlet 104, for lateritic nickel ore, reduction coal and additive to be carried out
Dispensing mixing treatment, obtains mixed material；The molding machine includes：Mixed material entrance 201 and mixing pelletizing outlet 202,
The mixed material entrance is connected with mixed material outlet, for the mixed material to be carried out forming processes, is mixed
Close pelletizing；The drying device includes：Mix pelletizing entrance 301 and dry bulb group outlet 302, the mixing pelletizing entrance with it is described
It mixes pelletizing outlet to be connected, for the mixing pelletizing to be dried processing, obtains dry bulb group；It is described that there is pyrolysis and reduction
The rotary hearth furnace of function includes：Adjacent feed zone, pyrolysis zone, reducing zone and discharge zone successively；The device for recovering oil and gas includes：
It is pyrolyzed oil gas entrance 501, tar outlet 502 and gas outlet 503, the pyrolysis oil gas entrance and the pyrolysis oil gas vent phase
Even；The slag sluicing system device includes：Metallized pellet entrance 601, ferro-nickel product outlet 602 and tailings outlet 603, the gold
Belong to pellet entrance with metallized pellet outlet to be connected.
Inventor has found that simple in structure according to the system in the embodiment of the present invention, easy to operate, which can be in laterite nickel
Ore deposit Direct Reduction realizes the pyrolysis of coal, and valuable petroleum resources is enable to recycle, so as to which it is straight to increase rotary hearth furnace coal base
The byproduct of reducing process is connect, reduces process energy consumption and cost.Meanwhile after pyrolysis semicoke continuation participated in rotary hearth furnace it is red
The direct reduction reactor of native nickel minerals obtains metallized pellet.
According to a particular embodiment of the invention, the rotary hearth furnace with pyrolysis and restoring function includes：It is adjacent successively
Feed zone, pyrolysis zone, reducing zone and discharge zone, wherein, the pyrolysis zone is set between the feed zone, the reducing zone respectively
There is partition wall 20, barricade 40 is equipped between the reducing zone and the discharge zone, the partition wall 20 and the barricade 40 are by institute
The roof for stating rotary hearth furnace extends downwardly, and keeps certain intervals with the cloth tray of the rotary hearth furnace.The reducing zone is with going out as a result,
Barricade between material area can effectively separate Liang Ge areas, can ensure that reducing zone atmosphere is stablized.
According to a particular embodiment of the invention, the feed zone furnace wall is equipped with dry bulb and rolls into a ball entrance 401, and the dry bulb group enters
Mouth is exported with dry bulb group to be connected, and dry bulb group entrance is used to roll into a ball to add in the rotary hearth furnace by dry bulb react；Institute
It states pyrolysis zone furnace wall and is equipped with pyrolysis oil gas vent 402, the pyrolysis oil gas vent turns bottom for that will be pyrolyzed described in oil gas discharge
Stove；The discharge zone furnace wall is equipped with metallized pellet and exports 403, for metallized pellet to be discharged.
According to a particular embodiment of the invention, it is described that there is pyrolysis and the concrete shape of the rotary hearth furnace of restoring function not to be had
Body limits, and lateritic nickel ore dry bulb group is pyrolyzed and reduction reaction as long as can realize.In some implementations of the present invention
In example, the horizontal cross-section of the rotary hearth furnace with pyrolysis and restoring function is circular ring shape, also, the annulus shared by each area presss from both sides
Angle is not particularly limited.Preferably, the annulus angle 30o-100o of the pyrolysis zone, the annulus angle 240o- of the reducing zone
300o ensures good pyrolysis effect and reduction effect.
According to a particular embodiment of the invention, it is described that there is pyrolysis and the heating side of the pyrolysis zone of the rotary hearth furnace of restoring function
Formula is not particularly limited, as long as raw material can be heated.In some embodiments of the invention, the pyrolysis zone, which uses, adds
The mode of heat pipe is heated, and further, the heating tube 10 may be mounted on the inside of the furnace wall of the pyrolysis zone, Ke Yishe
Put multiple heating tubes 10.In some embodiments of the invention, the heating tube includes tube body and internal heat resource, is to hot mode
Internal heat resource（Fuel gas buring or electric energy）Tube body is first heated, tube body is transferred heat in stove again, and this process is not in stove
Atmosphere disturbs.So as to realize and the raw material of the pyrolysis zone is heated.
According to a particular embodiment of the invention, it is described that there is pyrolysis and the heating side of the reducing zone of the rotary hearth furnace of restoring function
Formula is not particularly limited, as long as raw material can be heated.In some embodiments of the invention, the reducing zone is using burning
The mode of mouth is heated, and further, the burner 30 may be mounted on the inside of the furnace wall of the reducing zone, can set more
A burner 30.In some embodiments of the invention, it is passed in a manner that the heat that burner combustion generates is by radiant heat transfer
Pass pelletizing.Because the burning of burner open fire is with the advantage that burning capacity is big, heating temperature is high（Up to 1500 DEG C）, so as to real
Show and the raw material of the reducing zone has been heated.
According to a particular embodiment of the invention, which includes the device for recovering oil and gas, as long as can be to being pyrolyzed oil gas
It is recycled.In some embodiments of the invention, the device for recovering oil and gas includes：Pyrolysis oil gas entrance, tar go out
Mouthful and gas outlet, it is described pyrolysis oil gas entrance be connected with the pyrolysis oil gas vent of the rotary hearth furnace, for will be pyrolyzed oil gas into
Row is collected and separating treatment, obtains tar and combustion gas.Dust-laden pyrolysis oil gas will be effectively generated in the rotary hearth furnace as a result, to carry out
Recovery processing so that valuable petroleum resources are recycled, so as to increase 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, which includes the slag sluicing system device, as long as can be by the metal
Pellet carries out slag sluicing system processing.In some embodiments of the invention, the slag sluicing system device includes：Metallization
Pelletizing entrance, ferro-nickel product outlet and tailings outlet, the metallized pellet entrance are connected with metallized pellet outlet, use
In the metallized pellet is carried out slag sluicing system processing, ferro-nickel product and tailings are obtained.
According to an embodiment of the invention, the weight proportion of the lateritic nickel ore in the system, reduction coal and additive not by
Specific limitation.In some embodiments of the invention, the weight of the lateritic nickel ore in the system and reduction coal and additive
It matches as lateritic nickel ore：Reduction coal：Additive=100：10-40：3-15.Because when raw materials laterite nickel ore, reduction coal and addition
The weight proportion of agent is located in above range, and cinder viscosity can be made low, so as to be conducive to the aggregation of ferronickel particle and grow up.
According to an embodiment of the invention, the type of the reduction coal in the system and additive is not particularly limited, only
It can be used in being reacted.In some embodiments of the invention, the reduction coal be middle low-order coal, the additive
For at least one of alkali metal oxide, alkali metal salt, alkaline earth oxide and alkali salt.Further, it is described
The volatile matter of reduction coal is not less than 20%, it is preferred that is lignite.
In another aspect of the present invention, lateritic nickel ore heat is carried out using foregoing system the present invention provides a kind of
The method of solution and reduction reaction, as shown in figure 3, including the following steps：
（1）Lateritic nickel ore, reduction coal and additive are added in into dispensing mixing device and carry out batch mixing and dispensing processing, is mixed
Close material.
According to an embodiment of the invention, the system comprises dispensing mixing device, for by lateritic nickel ore, reduction coal and adding
Agent is added to carry out batch mixing and dispensing processing, obtains mixed material.In some embodiments of the invention, the laterite nickel in the system
Ore deposit is lateritic nickel ore with the weight proportion of reduction coal and additive：Reduction coal：Additive=100：10-40：3-15.Because when
The weight proportion of raw materials laterite nickel ore, reduction coal and additive is located in above range, and cinder viscosity can be made low, so as to favorably
In ferronickel particle aggregation and grow up.According to an embodiment of the invention, the type of the reduction coal in the system and additive is not
It is particularly limited, as long as can be used in carrying out pyrolytic reaction.In some embodiments of the invention, the reduction coal is
Middle low-order coal, the additive be alkali metal oxide, alkali metal salt, alkaline earth oxide and alkali salt at least
It is a kind of.Further, the volatile matter of the reduction coal is not less than 20%, it is preferred that is lignite.
（2）Mixed material is added in into molding machine and carries out forming processes, obtains mixing pelletizing.
（3）Mixing pelletizing is added in into drying device, processing is dried, obtain dry bulb group.
（4）Dry bulb group is added in the rotary hearth furnace with pyrolysis and restoring function and is pyrolyzed and reduction treatment, is obtained
It is pyrolyzed oil gas and metallized pellet.
According to a particular embodiment of the invention, the rotary hearth furnace with pyrolysis and restoring function includes：It is adjacent successively
Feed zone, pyrolysis zone, reducing zone and discharge zone, wherein, the pyrolysis zone is set between the feed zone, the reducing zone respectively
There is partition wall, barricade is equipped between the reducing zone and the discharge zone, the partition wall and the barricade are by the rotary hearth furnace
Roof extend downwardly, and certain intervals are kept with the cloth tray of the rotary hearth furnace.Dry bulb group it is described have pyrolysis and
The rotary hearth furnace of restoring function carries out pyrolysis and the reaction temperature of reduction treatment is：400-900 DEG C of the pyrolysis temperature of pyrolysis zone, in institute
It states pyrolysis zone and pyrolysis oil gas is obtained to the reduction coal progress pyrolysis processing that the dry bulb is rolled into a ball；The reduction temperature 1000- of reducing zone
1400 DEG C, the pelletizing after pyrolysis is restored in the reducing zone, to reach good reduction effect, finally obtain metallization
Pelletizing discharges rotary hearth furnace in discharge zone.The system can realize the pyrolysis of coal in lateritic nickel ore Direct Reduction as a result, and
And the direct reduction reactor of participation lateritic nickel ore in rotary hearth furnace of the semicoke continuation after pyrolysis obtains metallized pellet.
The system includes the device for recovering oil and gas, for the pyrolysis generated in the rotary hearth furnace oil gas to be collected and
Separating treatment obtains tar and combustion gas, as a result, valuable petroleum resources are recycled, so as to increase rotary hearth furnace coal base
The byproduct of technique is reduced directly, reduces process energy consumption and cost indirectly.
（5）Metallized pellet is added in into slag sluicing system device and carries out slag sluicing system processing, obtains ferro-nickel product and tailings.Root
According to specific embodiments of the present invention, the slag sluicing system device for the metallized pellet to be carried out slag sluicing system processing, obtains
To ferro-nickel product and tailings.The system realizes effective recycling of lateritic nickel ore as a result, has obtained ferro-nickel product.
Inventor has found that simple in structure according to the system in the embodiment of the present invention, easy to operate, which can be in laterite nickel
Ore deposit Direct Reduction realizes the pyrolysis of coal, and valuable petroleum resources is enable to recycle, so as to which it is straight to increase rotary hearth furnace coal base
The byproduct of reducing process is connect, reduces process energy consumption and cost.Meanwhile after pyrolysis semicoke continuation participated in rotary hearth furnace it is red
The direct reduction reactor of native nickel minerals obtains metallized pellet.
Embodiment 1
By lateritic nickel ore（Containing Ni 1.85%）, bituminous coal（Volatile matter 25%）With sodium carbonate in mass ratio 100:10:5 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 1.0%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 30o, pyrolysis zone temperature
500 DEG C, reducing zone annulus angle 300o, 1250 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet is sent into slag sluicing system device progress slag sluicing system and handles to obtain ferronickel powder（Containing Ni 5.62%,
TFe 64.73%）And tailings, whole flow process nickel recovery 95%.
Embodiment 2
By lateritic nickel ore（Containing Ni 2.45%）, lignite（Volatile matter 40%）With lime stone in mass ratio 100:25:15 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 1.5%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 40o, pyrolysis zone temperature
650 DEG C, reducing zone annulus angle 290o, 1300 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet is sent into slag sluicing system device progress slag sluicing system and handles to obtain ferronickel powder（Containing Ni 6.82%,
TFe 65.64%）And tailings, whole flow process nickel recovery 96%.
Embodiment 3
By lateritic nickel ore（Containing Ni 1.12%）, ub-bituminous coal（Volatile matter 35%）With lime in mass ratio 100:40:9 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 0.5%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 50o, pyrolysis zone temperature
850 DEG C, reducing zone annulus angle 280o, 1400 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet is sent into slag sluicing system device progress slag sluicing system and handles to obtain ferronickel powder（Containing Ni 3.83%,
TFe 75.83%）And tailings, whole flow process nickel recovery 97%.
Embodiment 4
By lateritic nickel ore（Containing Ni 1.85%）, bituminous coal（Volatile matter 25%）With sodium carbonate in mass ratio 100:15:5 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 1.0%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 60o, pyrolysis zone temperature
500 DEG C, reducing zone annulus angle 270o, 1200 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet carries out fusing separating treatment at 1450 DEG C and obtains dilval in being sent into electric arc furnaces
（Containing Ni 18.62%, TFe 79.73%）With ferronickel slag, whole flow process nickel recovery 96%.
Embodiment 5
By lateritic nickel ore（Containing Ni 2.45%）, lignite（Volatile matter 40%）With lime stone in mass ratio 100:20:15 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 1.5%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 80o, pyrolysis zone temperature
600 DEG C, reducing zone annulus angle 250o, 1300 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet, which is sent into combustion gas and is melted, to carry out fusing separating treatment at 1550 DEG C in point stove and obtains dilval
（Containing Ni 24.82%, TFe 73.24%）And tailings, whole flow process nickel recovery 97%.
Embodiment 6
By lateritic nickel ore（Containing Ni 1.12%）, ub-bituminous coal（Volatile matter 35%）With lime in mass ratio 100:35:9 in batch mixing
Progress dispensing, mixing treatment obtain mixed material in proportioner, and mixed material carries out forming processes in molding machine and obtains
Pelletizing is mixed, mixing pelletizing is then dried processing in drying device obtains dry bulb group（Aqueous 0.5%）, by dry bulb group
It is pyrolyzed and reduction treatment in the rotary hearth furnace with pyrolysis and restoring function, pyrolysis zone annulus angle 90o, pyrolysis zone temperature
700 DEG C, reducing zone annulus angle 240o, 1400 DEG C of reducing zone temperature, obtained pyrolysis oil gas is handled by device for recovering oil and gas
To tar and combustion gas, metallized pellet, which is sent into mineral hot furnace, to carry out fusing separating treatment at 1650 DEG C and obtains dilval（Contain
Ni 15.35%, TFe 82.83%）And tailings, whole flow process nickel recovery 98%.
In the description of the present invention, it is to be understood that term " first ", " second " are only used for description purpose, and cannot
It is interpreted as indicating or implies relative importance or imply the quantity of the technical characteristic indicated by indicating.Define as a result, " the
One ", one or more this feature can be expressed or be implicitly included to the feature of " second ".
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be that machinery connects
It connects or is electrically connected；It can be directly connected, can also be indirectly connected by intermediary, can be in two elements
The connection in portion or the interaction relationship of two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature can be with "above" or "below" second feature
It is that the first and second features are in direct contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature right 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 " one embodiment ", " example ", " is specifically shown " some embodiments "
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment of the present invention or example.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
It is combined in an appropriate manner in a or multiple embodiments or example.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the different embodiments or examples described in this specification and the feature of different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, those of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification, meanwhile, for those of ordinary skill in the art, the think of according to the application
Think, in specific embodiments and applications there will be changes.
Claims (7)
1. a kind of pyrolysis of lateritic nickel ore dry bulb group and reduction reaction system, which is characterized in that including：Dispensing mixing device, into
Type device, drying device, rotary hearth furnace, device for recovering oil and gas and the slag sluicing system device with pyrolysis and restoring function；
The dispensing mixing device includes：Lateritic nickel ore entrance, reduction coal entrance, additive entrance and mixed material outlet, are used
In lateritic nickel ore, reduction coal and additive are carried out dispensing mixing treatment, mixed material is obtained；
The molding machine includes：Mixed material entrance and the outlet of mixing pelletizing, the mixed material entrance and the mixture
Material outlet is connected, and for the mixed material to be carried out forming processes, obtains mixing pelletizing；
The drying device includes：Pelletizing entrance and the outlet of dry bulb group are mixed, the mixing pelletizing entrance mixes pelletizing with described
Outlet is connected, and for the mixing pelletizing to be dried processing, obtains dry bulb group；
The rotary hearth furnace for having pyrolysis and restoring function includes：Adjacent feed zone, pyrolysis zone, reducing zone and discharging successively
Area, wherein, the pyrolysis zone respectively between the feed zone, the reducing zone be equipped with partition wall, the reducing zone with it is described go out
Expect area between be equipped with barricade, the partition wall with the barricade is extended downwardly by the roof of the rotary hearth furnace, and with described turn
The cloth tray of bottom stove keeps certain intervals；Wherein, multiple heating tubes are equipped on the inside of the pyrolysis zone furnace wall, for the pyrolysis
Area carries out heating tube mode heating；Multiple burners are equipped on the inside of the reducing zone furnace wall, for carrying out burner to the reducing zone
Mode heats；The feed zone furnace wall is equipped with dry bulb and rolls into a ball entrance, and the pyrolysis zone furnace wall is equipped with pyrolysis oil gas vent, described
Discharge zone furnace wall is exported equipped with metallized pellet, and dry bulb group's entrance is exported with dry bulb group to be connected；It is described that there is heat
Circular ring shape is in the horizontal cross-section of the rotary hearth furnace of solution and restoring function, the annulus angle 30o-100o of the pyrolysis zone, the reduction
The annulus angle 240o-300o in area；
The device for recovering oil and gas includes：It is pyrolyzed oil gas entrance, tar outlet and gas outlet, the pyrolysis oil gas entrance and institute
It states pyrolysis oil gas vent to be connected, for the pyrolysis oil gas to be collected and separating treatment, obtains tar and combustion gas；
The slag sluicing system device includes：Metallized pellet entrance, ferro-nickel product outlet and tailings outlet, the metallized pellet
Entrance is connected with metallized pellet outlet, for the metallized pellet to be carried out slag sluicing system processing, obtains ferronickel production
Product and tailings.
A kind of 2. method that lateritic nickel ore pyrolysis and reduction reaction are carried out using system described in claim 1, which is characterized in that
Include the following steps：
（1）Lateritic nickel ore, reduction coal and additive are added in into dispensing mixing device and carry out batch mixing and dispensing processing, obtains mixture
Material；
（2）Mixed material is added in into molding machine and carries out forming processes, obtains mixing pelletizing；
（3）Mixing pelletizing is added in into drying device, processing is dried, obtain dry bulb group；
（4）Dry bulb group is added in the rotary hearth furnace with pyrolysis and restoring function and is pyrolyzed and reduction treatment, is pyrolyzed
Oil gas and metallized pellet；
（5）Metallized pellet is added in into slag sluicing system device and carries out slag sluicing system processing, obtains ferro-nickel product and tailings.
3. the according to the method described in claim 2, it is characterized in that, step（1）In reduction coal for middle low-order coal, volatilization
Divide not less than 20%.
4. according to the method described in claim 3, it is characterized in that, the middle low-order coal is lignite.
5. the according to the method described in claim 2, it is characterized in that, step（1）In additive be selected from alkali metal oxygen
At least one of compound, alkali metal salt, alkaline earth oxide and alkali salt.
6. the according to the method described in claim 2, it is characterized in that, step（1）In lateritic nickel ore and reduction coal and add
The weight proportion for adding agent is lateritic nickel ore：Reduction coal：Additive=100：10-40：3-15.
7. the according to the method described in claim 2, it is characterized in that, step（4）Middle dry bulb group is with pyrolysis and reduction
The rotary hearth furnace of function carries out pyrolysis and the reaction temperature of reduction treatment is：400-900 DEG C of pyrolysis temperature, reduction temperature 1000-
1400℃。
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