CN106244758A - A kind of system and method efficiently utilizing body of heater fume afterheat to process iron-containing resource - Google Patents

A kind of system and method efficiently utilizing body of heater fume afterheat to process iron-containing resource Download PDF

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Publication number
CN106244758A
CN106244758A CN201610819261.5A CN201610819261A CN106244758A CN 106244758 A CN106244758 A CN 106244758A CN 201610819261 A CN201610819261 A CN 201610819261A CN 106244758 A CN106244758 A CN 106244758A
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China
Prior art keywords
rotary hearth
hearth furnace
iron
drying tube
dry
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CN201610819261.5A
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Chinese (zh)
Inventor
王静静
李红科
宋文臣
曹志成
薛逊
吴道洪
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Jiangsu Province Metallurgical Design Institute Co Ltd
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Priority to CN201610819261.5A priority Critical patent/CN106244758A/en
Publication of CN106244758A publication Critical patent/CN106244758A/en
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21BMANUFACTURE OF IRON OR STEEL
    • C21B13/00Making spongy iron or liquid steel, by direct processes
    • C21B13/10Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
    • C21B13/105Rotary hearth-type furnaces

Abstract

The present invention relates to chemical industry metallurgical field, be specifically related to a kind of System and method for processing iron-containing resource.For the deficiencies in the prior art, the present invention proposes a kind of system and method efficiently utilizing body of heater fume afterheat to process iron-containing resource, this system and method is by improving the mode of heating of rotary hearth furnace, on the one hand the fume afterheat of rotary hearth furnace is made to be recycled inside rotary hearth furnace, improve the utilization ratio of rotary hearth furnace fume afterheat, on the other hand, pelletizing stoving process before eliminating rotary hearth furnace on the premise of not affecting product index, shorten technological process, reduce equipment investment, it is high that the present invention has fume afterheat utilization rate, handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, the advantage such as have wide range of applications.

Description

A kind of system and method efficiently utilizing body of heater fume afterheat to process iron-containing resource
Technical field
The present invention relates to chemical industry metallurgical field.In particular it relates to a kind of system processing iron-containing resource and side Method.
Background technology
Rotary hearth furnace be a kind of have annular furnace and can with the metallurgical industrial furnace at the bottom of rotary furnace, furnace interior for radiation pass Heat, is typically raised by burner combustion coal gas or natural gas or holding furnace bore temperature, is used for processing ferrous material, and collaborative carries Take the valuable metal elements such as nickel, zinc, chromium.Rotary hearth furnace coal-based direct reduction method is due to spies such as response speed are fast, adaptability to raw material is strong Point, is developed rapidly in recent years, can process the zinc-containing dust of steel plant, chromite, lateritic nickel ore, vanadium titano-magnetite, contain The various iron-containing resources such as ferrum metallurgical slag, red mud.But meanwhile, existing rotary hearth furnace equipment has a following weak point:
On the one hand, existing rotary hearth furnace fume afterheat utilization rate is relatively low.Rotary hearth furnace equipment belongs to high temperature reduction equipment, its fire box temperature It is generally located on 1200-1450 DEG C, higher than general furnace temp, so its flue-gas temperature is the highest, commonly reach More than 1000 DEG C.At present, the typical process that rotary hearth furnace fume afterheat utilizes is: drawn from rotary hearth furnace flue by high-temp waste gas, first First passing through waste heat boiler and produce steam, enter back into heat exchanger warm-up combustion-supporting air, the waste gas after heat exchange is used further to pelletizing to be done Dry, make flue-gas temperature be reduced to reach after the permission temperature of cleaner to arrange from chimney through dust removal process by mixing cold wind the most again Enter air.As nippon is used for processing blast furnace and converter dry dust and the rotary hearth furnace of low moisture mud, Iron and Steel Unit of Ma'an Mountain The construction of part company limited for processing the rotary hearth furnace of converter mud, Shen Wu group is that Sha Gangsuo builds for processing zinc-containing dust Rotary hearth furnaces etc., all use said method to reclaim fume afterheat, and the fume afterheat of recovery is mainly for the production of steam, preheating Air and dry raw material.The highest utilization rate of waste heat of above-mentioned flue gas heat recovery system also only has 55%, utilization rate of waste heat Low.Thus, the most more effectively the heat in recovered flue gas is a problem demanding prompt solution.
On the other hand, before existing rotary hearth furnace, pretreatment process is long, and equipment investment is of a relatively high.Existing rotary hearth furnace processes In the technological process of iron-containing resource, the aqueous pelletizing prepared need to be distributed into rotary hearth furnace after dried again and reduce, reason Be: the aqueous pelletizing (general more than 13%) of undried if directly enter stove can under the high temperature conditions fragmentation and produce entering the stove initial stage Raw a large amount of dust, under furnace gas perturbation action, can cause rotary hearth furnace to close on the burner on sidewall blocking of charging aperture conversion zone, Make the production can not direct motion.Visible, " being dried " link is the necessary pre-treatment step supporting with existing rotary hearth furnace combustion system, but Which results in pretreatment process length before rotary hearth furnace, equipment investment is big, energy consumption is high defect, be further improved.
Summary of the invention
For the deficiencies in the prior art, the present invention propose a kind of efficiently utilize body of heater fume afterheat process iron-containing resource be System and method, this system and method, by improving the mode of heating of rotary hearth furnace, on the one hand makes the fume afterheat of rotary hearth furnace turn the end Furnace interior is recycled, and improves the utilization ratio of rotary hearth furnace fume afterheat, on the other hand, before not affecting product index Putting the pelletizing stoving process before eliminating rotary hearth furnace, shorten technological process, reduce equipment investment, the present invention has cigarette The advantages such as gas utilization rate of waste heat is high, handling process is short, equipment investment is low, equipment operation rate is high, energy consumption is low, have wide range of applications.
For solving above-mentioned technical problem, the technical solution used in the present invention is:
The invention provides a kind of system efficiently utilizing body of heater fume afterheat to process iron-containing resource, it is characterised in that including: mixed Material device, ball-making device, fume afterheat furnace interior recycling type rotary hearth furnace, drying tube device, product segregation apparatus, wherein:
Described mixing device includes: iron-containing resource entrance, reducing agent entrance, flux entrance and mixed material outlet, described mixed Material device, for iron-containing resource, reducing agent and flux being mixed, obtains mixed material;
Described ball-making device includes: mixed material entrance, water inlet and the outlet of aqueous pelletizing, described mixed material entrance is with described Mixed material outlet is connected, and for by mixed material ball, obtains aqueous pelletizing;
Described fume afterheat furnace interior recycling type rotary hearth furnace includes: the most adjacent feed zone, dry section, reducing zone, go out Material district;Described feed zone is provided with aqueous pelletizing entrance, and described aqueous pelletizing entrance is connected with the outlet of described aqueous pelletizing;Described dry It is provided with drying tube device inside dry district burner hearth;Described reducing zone is provided with rotary hearth furnace exhanst gas outlet, and in furnace wall, reducing zone, outside is provided with Multiple burners;Described discharge zone is provided with reduction products export;Described rotary hearth furnace uses zone heating mode, and described dry section uses Drying tube device heats, and described reducing zone uses described burner to heat;Described fume afterheat furnace interior recycles Type rotary hearth furnace, for aqueous pelletizing is dried, is reduced, obtains going back original product;
Described drying tube device is positioned at inside described dry section burner hearth, and it has drying tube smoke inlet, drying tube exhanst gas outlet, Described drying tube smoke inlet is connected with described rotary hearth furnace exhanst gas outlet, described drying tube device for aqueous pelletizing is dried, Preheating, obtains the dry pelletizing of preheating;
Described product segregation apparatus includes: reduction product inlet, iron product outlet and the outlet of tailings mine tailing, described in go back original product and enter Mouth is connected with described reduction products export, and described product segregation apparatus carries out high melt or mill ore magnetic selection for going back original product Process, obtain iron product and tailings or mine tailing.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, uses aqueous pelletizing directly to enter The flow processing iron-containing resource of rotary hearth furnace, shortens pretreatment process, reduces production cost and equipment investment.The end is turned with tradition The mode that stove all uses furnace wall burner on sidewall to heat is compared, and the rotary hearth furnace of the present invention uses the mode of zone heating, solves burning The susceptible to plugging difficult problem of mouth, equipment operation rate is higher, it is achieved that the low-temperature reduction of iron-containing resource is smelted.Rotary hearth furnace uses high-temperature flue gas Carry out heat drying pipe device so that the fume afterheat that rotary hearth furnace furnace interior produces can effectively be recycled, thus, this system Achieve energy-saving and emission-reduction, environmental protection, reduce cost.
According to embodiments of the invention, the horizontal cross-section of described rotary hearth furnace is annular, and described reducing zone annulus angle is 100°-300°。
According to embodiments of the invention, the horizontal cross-section of described rotary hearth furnace is annular, and described dry section annulus angle is 10°-150°。
In another aspect of the present invention, the invention provides one and utilize foregoing system to carry out at iron-containing resource The method of reason, it is characterised in that comprise the following steps:
(1) described iron-containing resource, reducing agent and flux addition mixing device is mixed, obtain mixed material;
(2) described mixed material addition ball-making device is carried out ball processed, obtain aqueous pelletizing;
(3) described aqueous pelletizing is distributed in fume afterheat furnace interior recycling type rotary hearth furnace and is dried, reduces, described ball Group sequentially passes through feed zone, dry section, reducing zone, discharge zone, obtains going back original product, and wherein, described dry section uses drying tube Device mode of heating, as drying tube device thermal source, come from rotary hearth furnace flue discharge high-temperature flue gas through rotary hearth furnace flue gas Drying tube smoke inlet is sent in outlet, then is discharged by drying tube exhanst gas outlet;Described reducing zone uses burner on sidewall mode of heating;
(4) described original product of going back is added product segregation apparatus carries out high melt or mill ore magnetic selection and processes, obtain iron product and Tailings or mine tailing.
According to embodiments of the invention, the iron-containing resource in described step (1) be iron mine, the dust of steel plant, chromite, One or more in lateritic nickel ore, vanadium titano-magnetite, vanadium titanium sea sand, iron containing metallurgical slag, red mud.
According to embodiments of the invention, the reducing agent in described step (1) is solid carbon-contg material;Preferably, described solid State carbonaceous material is one or more in semi-coke, coal, white carbon black.
According to embodiments of the invention, the flux in described step (1) is limestone, quick lime, sodium carbonate, sulfate In one or more.
According to embodiments of the invention, in the raw mixture in described step (1), each material ratio is: reducing agent adds Amount is 0.8-1.8 times of theoretical addition, the 0-20% that interpolation weight is iron-containing resource weight of flux.
According to embodiments of the invention, the fume afterheat furnace interior recycling type rotary hearth furnace reaction in described step (3) Condition is: dry section minimum temperature 700-1000 DEG C, and reducing zone maximum temperature 1200-1400 DEG C, rotary hearth furnace rotates a circle the time For 30min-90min.
The beneficial effects of the present invention is:
(1) what the present invention provided efficiently utilizes body of heater fume afterheat to process the system and method for iron-containing resource, with conventional rotary hearth furnace The mode all using the heating of furnace wall burner on sidewall is compared, and the rotary hearth furnace of the present invention uses the mode of zone heating, solves burner A susceptible to plugging difficult problem.
(2) what the present invention provided efficiently utilizes body of heater fume afterheat to process the system and method for iron-containing resource, turns with tradition End furnaceman's skill is compared, and rotary hearth furnace burner of the present invention is not easily blocked, and equipment operation rate is higher.
(3) what the present invention provided efficiently utilizes body of heater fume afterheat to process the system and method for iron-containing resource, uses aqueous Pelletizing directly enters the flow processing iron-containing resource of rotary hearth furnace, shortens pretreatment process, reduces production cost and equipment investment.
(4) what the present invention provided efficiently utilizes body of heater fume afterheat to process the system and method for iron-containing resource, and rotary hearth furnace is adopted Heat drying pipe device is carried out so that the fume afterheat that rotary hearth furnace furnace interior produces can effectively be recycled with high-temperature flue gas, Thus, this system achieves energy-saving and emission-reduction, environmental protection, reduces cost.
Accompanying drawing explanation
Fig. 1 is the structure chart that the present invention efficiently utilizes the system of body of heater fume afterheat process iron-containing resource.
Fig. 2 is the workflow diagram that the present invention efficiently utilizes the system of body of heater fume afterheat process iron-containing resource.
Wherein, 1, mixing device, 2, ball-making device, 3, fume afterheat furnace interior recycling type rotary hearth furnace, 301, charging District, 302, dry section, 303, reducing zone, 304, discharge zone, 305, rotary hearth furnace exhanst gas outlet, 4, drying tube device, 401, be dried Pipe exhanst gas outlet, 402, drying tube smoke inlet, 5, product segregation apparatus.
Detailed description of the invention
In order to make those skilled in the art be more fully understood that technical scheme, below in conjunction with specific embodiment to this Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, and is not understood that For limitation of the present invention.Unreceipted concrete technology or condition in embodiment, according to the skill described by the document in this area Art or condition or carry out according to product description.
Fig. 1 is the structure chart that the present invention efficiently utilizes the system of body of heater fume afterheat process iron-containing resource, as it is shown in figure 1, This system includes: mixing device 1, ball-making device 2, fume afterheat furnace interior recycling type rotary hearth furnace 3, drying tube device 4, product Product segregation apparatus 5, wherein: described mixing device includes: iron-containing resource entrance, reducing agent entrance, flux entrance and mixture Material outlet, described mixing device, for iron-containing resource, reducing agent and flux being mixed, obtains mixed material;Described system Ball device includes: mixed material entrance, water inlet and the outlet of aqueous pelletizing, described mixed material entrance goes out with described mixed material Mouth is connected, and for by mixed material ball, obtains aqueous pelletizing;Described fume afterheat furnace interior recycling type rotary hearth furnace bag Including: the most adjacent feed zone 301, dry section 302, reducing zone 303, discharge zone 304, described rotary hearth furnace uses zone heating side Formula, described dry section uses drying tube device to heat, and described reducing zone uses described burner to heat;Described drying tube Device is positioned at inside described dry section burner hearth, and it has drying tube smoke inlet 402, drying tube exhanst gas outlet 401, described dry Pipe smoke inlet is connected with described rotary hearth furnace exhanst gas outlet 305, and described drying tube device is used for aqueous pelletizing is dried, is preheated, Obtain the dry pelletizing of preheating;Described product segregation apparatus includes: reduction product inlet, iron product outlet and tailings mine tailing go out Mouthful, described reduction product inlet is connected with described reduction products export, and described product segregation apparatus is carried out for going back original product High melt or mill ore magnetic selection process, and obtain iron product and tailings or mine tailing.
Inventor finds, system structure according to embodiments of the present invention is simple, easy to operate, uses aqueous pelletizing directly to enter The flow processing iron-containing resource of rotary hearth furnace, shortens pretreatment process, reduces production cost and equipment investment.The end is turned with tradition The mode that stove all uses furnace wall burner on sidewall to heat is compared, and the rotary hearth furnace of the present invention uses the mode of zone heating, solves burning The susceptible to plugging difficult problem of mouth, equipment operation rate is higher, it is achieved that the low-temperature reduction of iron-containing resource is smelted.Rotary hearth furnace uses high-temperature flue gas Carry out heat drying pipe device so that the fume afterheat that rotary hearth furnace furnace interior produces can effectively be recycled, thus, this system Achieve energy-saving and emission-reduction, environmental protection, reduce cost.
According to embodiments of the invention, described fume afterheat furnace interior recycling type rotary hearth furnace, for by aqueous pelletizing Being dried, reduce, obtain going back original product, described fume afterheat furnace interior recycling type rotary hearth furnace includes: the most adjacent charging District, dry section, reducing zone, discharge zone.In some embodiments of the invention, described feed zone is provided with aqueous pelletizing entrance, institute Stating aqueous pelletizing entrance to be connected with the outlet of described aqueous pelletizing, described aqueous pelletizing entrance for adding described turning by aqueous pelletizing React in end stove stove;Described reducing zone is provided with rotary hearth furnace exhanst gas outlet, for producing in the reducing zone of described rotary hearth furnace High-temperature flue gas discharge, and, described high-temperature flue gas heats as the thermal source of drying tube device;Described discharge zone is provided with Reduction products export, discharges for going back original product.
According to a particular embodiment of the invention, the concrete shape of described fume afterheat furnace interior recycling type rotary hearth furnace is not It is particularly limited, as long as being capable of pelletizing aqueous to iron-containing resource to carry out reduction reaction.Some enforcements in the present invention In example, the horizontal cross-section of described fume afterheat furnace interior recycling type rotary hearth furnace is annular, and, the circle shared by each district Ring angle is not particularly limited.Preferably, described dry section annulus angle is 10 °-150 °,Described reducing zone annulus angle is 100 °-300 °, it is ensured that good reduction effect.In some embodiments of the invention, the described rotary hearth furnace time of rotating a circle is 30min-90min, this interval choose the reduction effect that both can ensure pelletizing, do not result in again energy waste.
According to a particular embodiment of the invention, the adding of the dry section of described fume afterheat furnace interior recycling type rotary hearth furnace Hot mode is the most particularly limited, as long as the removing of material table water, the removing of iron-containing resource water of crystallization and material can be completed Preheat.In some embodiments of the invention, described dry section uses the mode of drying tube device to heat, further , described drying tube device is positioned at inside described dry section burner hearth, and it has drying tube smoke inlet, drying tube exhanst gas outlet, Described drying tube device, for aqueous pelletizing is dried, is preheated, obtains the dry pelletizing of preheating, wherein, described drying tube flue gas Entrance is connected with described rotary hearth furnace exhanst gas outlet, described for being transported to by the high-temperature flue gas that described rotary hearth furnace exhanst gas outlet is discharged In drying tube device.In some embodiments of the invention, described drying tube device is to produce in the reducing zone of described rotary hearth furnace High-temperature flue gas as thermal source, heat the material of the dry section of described rotary hearth furnace.Wherein, as drying tube device thermal source, next Described drying tube smoke inlet is sent into through described rotary hearth furnace exhanst gas outlet from the described high-temperature flue gas discharged in rotary hearth furnace flue, then Discharged by described drying tube exhanst gas outlet.Compared with the mode that conventional rotary hearth furnace all uses furnace wall burner on sidewall to heat, the present invention Described fume afterheat furnace interior recycling type rotary hearth furnace dry section use drying tube device heating mode avoid into The burner blockage problem at stove initial stage, can use aqueous pelletizing to be directly distributed into the technique of rotary hearth furnace, ensure and produce direct motion.Meanwhile, with Tradition dry bulb enters the technique of rotary hearth furnace and compares, and the aqueous pelletizing before the present invention eliminates rotary hearth furnace dries this flow process, shortens Technological process, greatly reduces equipment investment;The fume afterheat that described rotary hearth furnace furnace interior produces can be by profit the most again With, thus, this system achieves environmental protection, reduces cost.
According to a particular embodiment of the invention, the adding of the reducing zone of described fume afterheat furnace interior recycling type rotary hearth furnace Hot mode is the most particularly limited, as long as hot charge can be added.In some embodiments of the invention, described reducing zone is adopted Heating by the mode of burner, further, described burner may be mounted at described reducing zone, can arrange multiple burner. In some embodiments of the invention, the heat using burner combustion to produce passes to pelletizing by the way of radiant heat transfer. Compared with conventional rotary hearth furnace technique, rotary hearth furnace burner of the present invention is not easily blocked, and equipment operation rate is higher.
According to a particular embodiment of the invention, this system also includes described product segregation apparatus, enters for going back original product Row high melt or mill ore magnetic selection process, and obtain iron product and tailings or mine tailing.In some embodiments of the invention, described product Product segregation apparatus includes: reduction product inlet, iron product outlet and the outlet of tailings mine tailing, and described reduction product inlet is gone back with described Original product outlet is connected, and described product segregation apparatus carries out high melt or mill ore magnetic selection process for going back original product, obtains Iron product and tailings or mine tailing.Thus, this system achieves the efficient recovery to iron-containing resource, has obtained iron product.
According to embodiments of the invention, the weight proportion of iron-containing resource, reducing agent and flux in described system is not subject to Concrete restriction.In some embodiments of the invention, the weight of iron-containing resource, reducing agent and the flux in described system is joined Ratio is: reducing agent addition is 0.8-1.8 times of theoretical addition, the 0-that interpolation weight is iron-containing resource weight of flux 20%.Because if the addition of reducing agent is too low, the reduction melting effect of iron-containing resource can be affected;And if the addition of reducing agent Too high, the technical specification of product can not be improved, and coal resource can be caused to waste, improve production cost.Being added with of flux It is beneficial to promote the reduction of iron-containing resource, reduces the reduction temperature of mineral, and then reduce energy consumption and cost, so, making of flux With being intended to promote Iron containing silicate minerals decomposition, and effectively reduce mineral reduction temperature, and then reduce energy consumption, reduce cost.
According to embodiments of the invention, the kind of iron-containing resource, reducing agent and flux in described system is not by concrete Restriction, as long as can be used in carrying out reacting.In some embodiments of the invention, iron-containing resource is iron mine, steel plant Dust, chromite, lateritic nickel ore, vanadium titano-magnetite, vanadium titanium sea sand, iron containing metallurgical slag, one or more in red mud;Reduction Agent is solid carbon-contg material;Flux is one or more in limestone, quick lime, sodium carbonate, sulfate.Preferably, institute Stating solid carbon-contg material is one or more in semi-coke, coal, white carbon black.It addition, use mill coal to make reducing agent, use mill coal generation Replace the coke of scarcity of resources, not only save coking cost, and to the rare energy during achieving steel smelting procedure Replacement, Appropriate application natural resources to greatest extent.
In another aspect of the present invention, the invention provides one and utilize foregoing system to carry out iron-containing resource to enter The method that row processes, its workflow is as in figure 2 it is shown, comprise the following steps:
(1) described iron-containing resource, reducing agent and flux addition mixing device is mixed, obtain mixed material.
According to embodiments of the invention, described system includes mixing device, for by iron-containing resource, reducing agent and flux Carry out batch mixing and dispensing processes, obtain mixed material.In some embodiments of the invention, the iron-containing resource in described system, The weight proportion of reducing agent and flux is: reducing agent addition is 0.8-1.8 times of theoretical addition, the interpolation weight of flux Amount is the 0-20% of iron-containing resource weight.Wherein, described iron-containing resource be iron mine, the dust of steel plant, chromite, lateritic nickel ore, One or more in vanadium titano-magnetite, vanadium titanium sea sand, iron containing metallurgical slag, red mud;Described reducing agent is solid carbon-contg material;Institute Stating flux is one or more in limestone, quick lime, sodium carbonate, sulfate.Preferably, described solid carbon-contg material is One or more in semi-coke, coal, white carbon black.
(2) described mixed material addition ball-making device is carried out ball processed, obtain aqueous pelletizing.
According to embodiments of the invention, described system includes ball-making device, processes for mixed material carries out ball processed, To aqueous pelletizing.Compared with the technique that tradition dry bulb enters rotary hearth furnace, the present invention eliminates the aqueous pelletizing before rotary hearth furnace and dries This flow process, shortens technological process, greatly reduces equipment investment.
(3) described aqueous pelletizing is distributed in fume afterheat furnace interior recycling type rotary hearth furnace and is dried, reduces, To going back original product.
According to embodiments of the invention, described system includes fume afterheat furnace interior recycling type rotary hearth furnace, and being used for will Aqueous pelletizing is dried, reduces, and obtains going back original product.In some embodiments of the invention, in described fume afterheat body of heater Portion's recycling type rotary hearth furnace includes: the most adjacent feed zone, dry section, reducing zone, discharge zone, wherein, described rotary hearth furnace is adopted Using zone heating mode, described dry section uses drying tube device to heat, as drying tube device thermal source, come from and turn The high-temperature flue gas that end stove flue is discharged sends into drying tube smoke inlet through rotary hearth furnace exhanst gas outlet, then is arranged by drying tube exhanst gas outlet Go out;Described reducing zone uses described burner to heat.The mode phase that furnace wall burner on sidewall heats all is used with conventional rotary hearth furnace Ratio, the rotary hearth furnace of the present invention uses the mode of zone heating, solves the susceptible to plugging difficult problem of burner.Described aqueous pelletizing is via institute The feed zone stating rotary hearth furnace enters, and after being then dried process by dry section, reducing zone of entering carries out reduction reaction, After, the original product of going back obtained is discharged via discharge zone.Described aqueous pelletizing reaction condition in described rotary hearth furnace is: be dried District's minimum temperature 700-1000 DEG C, carries out material table water removing, the removing of iron-containing resource water of crystallization and the preheating of material;Reduction District's maximum temperature 1200-1400 DEG C, carries out reduction treatment to iron-containing resource;The described rotary hearth furnace time of rotating a circle is 30min- 90min.Compared with conventional rotary hearth furnace technique, rotary hearth furnace burner of the present invention is not easily blocked, and equipment operation rate is higher.
In some embodiments of the invention, described drying tube device is with the high temperature produced in the reducing zone of described rotary hearth furnace Flue gas, as thermal source, heats the material of the dry section of described rotary hearth furnace.All use furnace wall burner on sidewall to heat with conventional rotary hearth furnace Mode compare, the dry section of the described fume afterheat furnace interior recycling type rotary hearth furnace of the present invention uses drying tube device to add The mode of heat avoids the burner blockage problem into the stove initial stage, and aqueous pelletizing can be used directly to be distributed into the technique of rotary hearth furnace, ensures Produce direct motion;The fume afterheat that described rotary hearth furnace furnace interior produces can effectively be recycled, thus, this system achieves green Colour circle is protected, and reduces cost.
(4) described original product addition product segregation apparatus of going back is carried out high melt or mill ore magnetic selection process, obtain ferrum and produce Product and tailings or mine tailing.
According to a particular embodiment of the invention, this system also includes described product segregation apparatus, enters for going back original product Row high melt or mill ore magnetic selection process, and obtain iron product and tailings or mine tailing.In some embodiments of the invention, described product Product segregation apparatus includes: reduction product inlet, iron product outlet and the outlet of tailings mine tailing, and described reduction product inlet is gone back with described Original product outlet is connected, and described product segregation apparatus carries out high melt or mill ore magnetic selection process for going back original product, obtains Iron product and tailings or mine tailing.Thus, this system achieves the efficient recovery to iron-containing resource, has obtained iron product.
Embodiment 1:
Selecting TFe20.4%, raw material, as raw material, is first crushed to below 2mm by the lateritic nickel ore containing Ni1.53%, and reducing agent is Fixed carbon content is the brown coal of 58%, and addition is 1.1 times of theoretical addition, and the addition of limestone is lateritic nickel ore weight 10% carry out mixing-pressure ball, aqueous pelletizing moisture is 17%, pressed aqueous pelletizing is directly distributed into rotary hearth furnace and is dried-goes back Original place is managed, and the dry section of rotary hearth furnace uses drying tube device to heat, and the thermal source of drying tube device comes from rotary hearth furnace flue The high-temperature flue gas discharged, the high-temperature flue gas feeding drying tube smoke inlet that rotary hearth furnace flue is discharged, then by drying tube exhanst gas outlet Discharge;Reducing zone uses burner heating;The annulus angle of dry section is 100 °, and the annulus angle of reducing zone is 210 °;Dry section Entering stove minimum temperature is 800 DEG C, and reducing zone maximum temperature is 1250 DEG C;Rotary hearth furnace rotates a circle time 35min, rotary hearth furnace discharging The original product hot feeding smelting furnace of going back obtained carries out melting, and smelting furnace is provided by low-heat value gas, melting in-furnace temperature 1550 About DEG C, obtain the dilval of nickel grade 14%, nickel recovery 95%.
Embodiment 2:
Selecting TFe20.4%, raw material, as raw material, is first crushed to below 1mm by the lateritic nickel ore containing Ni1.53%, and reducing agent is Fixed carbon content is the brown coal of 58%, and addition is 1.2 times of theoretical addition, and the addition of limestone is lateritic nickel ore weight 10% carry out mixing-pressure ball, aqueous pelletizing moisture is 17%, pressed aqueous pelletizing is directly distributed into rotary hearth furnace and is dried-goes back Original place is managed, and the dry section of rotary hearth furnace uses drying tube device to heat, and the thermal source of drying tube device comes from rotary hearth furnace flue The high-temperature flue gas discharged, the high-temperature flue gas feeding drying tube smoke inlet that rotary hearth furnace flue is discharged, then by drying tube exhanst gas outlet Discharge;Reducing zone uses burner heating;The annulus angle of dry section is 100 °, and the annulus angle of reducing zone is 210 °;Dry section Entering stove minimum temperature is 850 DEG C, and reducing zone maximum temperature is 1280 DEG C;Rotary hearth furnace rotates a circle time 40min, rotary hearth furnace discharging Obtain go back original product through mill ore magnetic selection process after, obtain the ferronickel powder of nickel grade 5.2%, nickel recovery 84%.
Embodiment 3:
Select TFe content 57.10%, TiO2Content 12.94%, V2O5The vanadium titanium sea sand of content 0.67 is as raw material, reducing agent The white carbon black obtained after pyrolysis for solid waste, its addition is 1.3 times of theoretical addition, and the addition of quick lime is ore weight 8% carry out ball processed, aqueous pelletizing moisture is 14%, aqueous pelletizing is directly distributed into rotary hearth furnace and is dried-reduction treatment, turn the end The dry section of stove uses drying tube device to heat, and the thermal source of drying tube device comes from the high temperature cigarette that rotary hearth furnace flue is discharged Gas, the high-temperature flue gas that rotary hearth furnace flue is discharged is sent into drying tube smoke inlet, then is discharged by drying tube exhanst gas outlet;Reducing zone is adopted Heat with burner;The annulus angle of dry section is 50 °, and the annulus angle of reducing zone is 260 °;Dry section enters stove minimum temperature 900 DEG C, reducing zone maximum temperature is 1350 DEG C;Rotary hearth furnace rotates a circle time 60min, and what rotary hearth furnace discharging obtained goes back original product Carry out high melt, melting in-furnace temperature about 1650 DEG C, obtain the iron block of Iron grade 95.6%, iron recovery 95%.Drying tube The flue gas that exhanst gas outlet is discharged produces steam through waste heat boiler, mixes cold wind, then removing dust after preheating air the most again Air is entered after process.
Embodiment 4
The difficulty selecting TFe content 33.82% selects lean iron mine as raw material, and reducing agent is semi-coke, and its addition is theoretical addition 1.0 times, the addition of limestone is that the 10% of ore weight carries out ball processed, and aqueous pelletizing moisture is 14%, by straight for aqueous pelletizing Connecing and be distributed into rotary hearth furnace and be dried-reduction treatment, the dry section of rotary hearth furnace uses drying tube device to heat, drying tube device Thermal source come from rotary hearth furnace flue discharge high-temperature flue gas, rotary hearth furnace flue discharge high-temperature flue gas send into drying tube flue gas enter Mouthful, then discharged by drying tube exhanst gas outlet;Reducing zone uses burner heating;The annulus angle of dry section is 40 °, the circle of reducing zone Ring angle is 270 °;It is 750 DEG C that dry section enters stove minimum temperature, and reducing zone maximum temperature is 1300 DEG C;Rotary hearth furnace rotates a circle Time 50min, what rotary hearth furnace discharging obtained go back, and original product sends into electric furnace carries out melting, in-furnace temperature about 1600 DEG C, obtains ferrum The iron block of grade 96.8%, iron recovery 94%.
Embodiment 5:
The difficulty selecting TFe content 33.82% selects lean iron mine as raw material, and reducing agent is semi-coke, and its addition is theoretical addition 1.2 times, the addition of limestone is the 10% of ore weight, and industrial soda addition 2% carries out ball processed, and aqueous pelletizing moisture is 14%, aqueous pelletizing is directly distributed into rotary hearth furnace and is dried-reduction treatment, the dry section of rotary hearth furnace uses drying tube device to enter Row heating, the thermal source of drying tube device comes from the high-temperature flue gas that rotary hearth furnace flue is discharged, the high temperature cigarette that rotary hearth furnace flue is discharged Pneumatic transmission enters drying tube smoke inlet, then is discharged by drying tube exhanst gas outlet;Reducing zone uses burner heating;The annulus folder of dry section Angle is 40 °, and the annulus angle of reducing zone is 270 °;It is 750 DEG C that dry section enters stove minimum temperature, and reducing zone maximum temperature is 1320 ℃;Rotary hearth furnace rotates a circle time 50min, and what rotary hearth furnace discharging obtained go back original product obtains Iron grade 91% after mill ore magnetic selection Iron powder, iron recovery 90.2%.
Embodiment 6:
Select from South Africa TFe content 20.08%, Cr2O3The chromite of content 51.08% is as raw material, and reducing agent is smokeless Coal, flux is selected limestone, mixing-ball processed after being made up water by above-mentioned raw materials, aqueous pelletizing is directly distributed into rotary hearth furnace and carries out Being dried-reduction treatment, the dry section of rotary hearth furnace uses drying tube device to heat, and the thermal source of drying tube device comes from and turns the end The high-temperature flue gas that stove flue is discharged;Reducing zone uses burner heating;The annulus angle of dry section is 30 °, the annulus folder of reducing zone Angle is 280 °;It is 900 DEG C that dry section enters stove minimum temperature, and reducing zone maximum temperature is 1400 DEG C;Rotary hearth furnace rotates a circle the time 70min, what rotary hearth furnace discharging obtained go back, and original product sends into ore-smelting electric furnace carries out melting, obtains the ferrochrome block of chromium grade 56.31%, Chromium recovery ratio 94.9%.
Embodiment 7:
Select TFe content 41.38%, S content 1.15% nickel slag as raw material, anthracite elected as by reducing agent, and stone selected by flux Lime stone and sodium carbonate, mix-ball processed by above-mentioned raw materials, the more aqueous pelletizing of aqueous 15% is directly distributed into rotary hearth furnace be dried- Reduction treatment, the dry section of rotary hearth furnace uses drying tube device to heat, and the thermal source of drying tube device comes from rotary hearth furnace cigarette The high-temperature flue gas that road is discharged;Reducing zone uses burner heating;The annulus angle of dry section is 60 °, and the annulus angle of reducing zone is 250°;It is 800 DEG C that dry section enters stove minimum temperature, and reducing zone maximum temperature is 1310 DEG C;Rotary hearth furnace rotates a circle the time 45min, what rotary hearth furnace discharging obtained go back, and original product sends into ore-smelting electric furnace carries out melting, obtains the iron block of Iron grade 93.85%, chromium The response rate 95.21%.
Embodiment 8:
Select TFe content 41.38%, S content 1.15% nickel slag as raw material, anthracite elected as by reducing agent, and stone selected by flux Lime stone and sodium carbonate, mix-ball processed by above-mentioned raw materials, the more aqueous pelletizing of aqueous 15% is directly distributed into rotary hearth furnace be dried- Reduction treatment, the dry section of rotary hearth furnace uses drying tube device to heat, and the thermal source of drying tube device comes from rotary hearth furnace cigarette The high-temperature flue gas that road is discharged;Reducing zone uses burner heating;The annulus angle of dry section is 60 °, and the annulus angle of reducing zone is 250°;It is 900 DEG C that dry section enters stove minimum temperature, and reducing zone maximum temperature is 1330 DEG C;Rotary hearth furnace rotates a circle the time 45min, what rotary hearth furnace discharging obtained go back after original product carries out mill ore magnetic selection process, obtains the iron powder of Iron grade 92%, iron recovery 91.8%。
In describing the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not It is interpreted as instruction or hint relative importance or the implicit quantity indicating indicated technical characteristic.Thus, define " the One ", the feature of " second " can express or implicitly include one or more this feature.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " etc. Term should be interpreted broadly, and connects for example, it may be fixing, it is also possible to be to removably connect, or integral;Can be that machinery connects Connect, it is also possible to be electrical connection;Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, in can being two elements The connection in portion or the interaction relationship of two elements.For the ordinary skill in the art, can be according to concrete feelings Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score permissible It is that the first and second features directly contact, or the first and second features are by intermediary mediate contact.And, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or be merely representative of Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show Example " or the description of " some examples " etc. means to combine this embodiment or example describes specific features, structure, material or spy Point is contained at least one embodiment or the example of the present invention.In this manual, to the schematic representation of above-mentioned term not Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be arbitrary Individual or multiple embodiment or example combine in an appropriate manner.Additionally, in the case of the most conflicting, the skill of this area The feature of the different embodiments described in this specification or example and different embodiment or example can be tied by art personnel Close and combination.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is example Property, it is impossible to being interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-mentioned Embodiment is changed, revises, replaces and modification, simultaneously for one of ordinary skill in the art, according to the think of of the application Think, the most all will change.

Claims (9)

1. one kind efficiently utilizes the system that body of heater fume afterheat processes iron-containing resource, it is characterised in that including: mixing device, system Ball device, fume afterheat furnace interior recycling type rotary hearth furnace, drying tube device, product segregation apparatus, wherein:
Described mixing device includes: iron-containing resource entrance, reducing agent entrance, flux entrance and mixed material outlet, described mixed Material device, for iron-containing resource, reducing agent and flux being mixed, obtains mixed material;
Described ball-making device includes: mixed material entrance, water inlet and the outlet of aqueous pelletizing, described mixed material entrance is with described Mixed material outlet is connected, and for by mixed material ball, obtains aqueous pelletizing;
Described fume afterheat furnace interior recycling type rotary hearth furnace includes: the most adjacent feed zone, dry section, reducing zone, go out Material district;Described feed zone is provided with aqueous pelletizing entrance, and described aqueous pelletizing entrance is connected with the outlet of described aqueous pelletizing;Described dry It is provided with drying tube device inside dry district burner hearth;Described reducing zone is provided with rotary hearth furnace exhanst gas outlet, and in furnace wall, reducing zone, outside is provided with Multiple burners;Described discharge zone is provided with reduction products export;Described rotary hearth furnace uses zone heating mode, and described dry section uses Drying tube device heats, and described reducing zone uses described burner to heat;Described fume afterheat furnace interior recycles Type rotary hearth furnace, for aqueous pelletizing is dried, is reduced, obtains going back original product;
Described drying tube device is positioned at inside described dry section burner hearth, and it has drying tube smoke inlet, drying tube exhanst gas outlet, Described drying tube smoke inlet is connected with described rotary hearth furnace exhanst gas outlet, described drying tube device for aqueous pelletizing is dried, Preheating, obtains the dry pelletizing of preheating;
Described product segregation apparatus includes: reduction product inlet, iron product outlet and the outlet of tailings mine tailing, described in go back original product and enter Mouth is connected with described reduction products export, and described product segregation apparatus carries out high melt or mill ore magnetic selection for going back original product Process, obtain iron product and tailings or mine tailing.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described rotary hearth furnace is annular, described also Former district annulus angle is 100 °-300 °.
System the most according to claim 1, it is characterised in that the horizontal cross-section of described rotary hearth furnace is annular, described dry Dry district annulus angle is 10 °-150 °.
4. the method that the system utilized according to any one of claim 1-3 carries out iron-containing resource process, it is characterised in that Comprise the following steps:
(1) described iron-containing resource, reducing agent and flux addition mixing device is mixed, obtain mixed material;
(2) described mixed material addition ball-making device is carried out ball processed, obtain aqueous pelletizing;
(3) described aqueous pelletizing is distributed in fume afterheat furnace interior recycling type rotary hearth furnace and is dried, reduces, described ball Group sequentially passes through feed zone, dry section, reducing zone, discharge zone, obtains going back original product, and wherein, described dry section uses drying tube Mode of heating, as drying tube thermal source, come from rotary hearth furnace flue discharge high-temperature flue gas through rotary hearth furnace exhanst gas outlet send into Drying tube smoke inlet, then discharged by drying tube exhanst gas outlet;Described reducing zone uses burner on sidewall mode of heating;
(4) described original product of going back is added product segregation apparatus carries out high melt or mill ore magnetic selection and processes, obtain iron product and Tailings or mine tailing.
Method the most according to claim 4, it is characterised in that the iron-containing resource in described step (1) is iron mine, steel plant Dust, chromite, lateritic nickel ore, vanadium titano-magnetite, vanadium titanium sea sand, iron containing metallurgical slag, one or more in red mud.
Method the most according to claim 4, it is characterised in that the reducing agent in described step (1) is solid carbon-contg material; Preferably, described solid carbon-contg material is one or more in semi-coke, coal, white carbon black.
Method the most according to claim 4, it is characterised in that the flux in described step (1) is limestone, calculogenesis One or more in ash, sodium carbonate, sulfate.
Method the most according to claim 4, it is characterised in that each material ratio in the raw mixture in described step (1) Example is: reducing agent addition is 0.8-1.8 times of theoretical addition, the 0-that interpolation weight is iron-containing resource weight of flux 20%。
Method the most according to claim 4, it is characterised in that the fume afterheat furnace interior in described step (3) is the most sharp With type rotary hearth furnace reaction condition it is: dry section minimum temperature 700-1000 DEG C, reducing zone maximum temperature 1200-1400 DEG C, turns the end The stove time of rotating a circle is 30min-90min.
CN201610819261.5A 2016-09-13 2016-09-13 A kind of system and method efficiently utilizing body of heater fume afterheat to process iron-containing resource Pending CN106244758A (en)

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Application publication date: 20161221