CN105969928B - Prepare system and its application of reduced iron - Google Patents
Prepare system and its application of reduced iron Download PDFInfo
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- CN105969928B CN105969928B CN201610349462.3A CN201610349462A CN105969928B CN 105969928 B CN105969928 B CN 105969928B CN 201610349462 A CN201610349462 A CN 201610349462A CN 105969928 B CN105969928 B CN 105969928B
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- slag
- entrance
- reduced iron
- outlet
- copper ashes
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
-
- 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
- C22B1/02—Roasting processes
Abstract
The invention discloses a kind of systems preparing reduced iron and the method for preparing reduced iron using the system for preparing reduced iron.Wherein, the system for preparing reduced iron includes：Slagging device, pelletizer, reduction roasting device, dry type magnetic separation device and slag sluicing system device.Additive entrance and fluxing agent entrance is arranged using molten copper slag as raw material in the system in slagging device, and additive and fluxing agent is added into high-temperature fusion copper ashes before heat treatment, and simplification of flowsheet reduces production and operating cost.
Description
Technical field
The present invention relates to the systems for preparing reduced iron, and prepare reduced iron using the system above-mentioned for preparing reduced iron
Method.
Background technology
Copper ashes is the solid slag generated in pyrometallurgic copper process, belongs to one kind in non-ferrous metal slag.Estimate according to incomplete,
The annual copper ashes yield in China adds up stockpiling and has reached several hundred million tons so far at 1000~15,000,000 tons.These waste residues do not only take up largely
Soil also causes the environmental problems such as dust airborne dust, heavy metal exudation, underground water pollution, soil dilution, gives human survival and society
Development brings serious harm.So far due to copper ashes recycling attention degree not enough and related process technologies restriction, at me
Extensive ripe popularization is also not implemented in the high-efficiency comprehensive utilization of state, copper ashes, and a large amount of copper ashes heaps are abandoned in cinder field, and valuable gold in slag is caused
Belong to the loss of element, the waste of resource.
Since all iron content is typically about 40% in copper ashes, it is far above the payable grade (TFe of China's iron ore>27%),
Therefore the utilization ways of current copper ashes are mostly based on the remaining iron element of recycling.However since in copper ashes, ferro element is mainly with iron olive
Olive stone, Fe3O4Etc. mineral facies exist, these mineral facies are mutually closely entrenched togather with other non magnetic ores in addition, and have
Weak magnetic (such as fayalite) causes directly using process routes such as the choosing of tradition mill, magnetic separation, it is difficult to whole iron in copper ashes is plain
With recycling.For this purpose, in existing correlative study and engineering application, copper ashes mostly by with addition of reducing agent, additive and binder,
Roasting is restored after pelletizing or agglomeration, obtains metallized pellet or agglomerate.Finally, then by these metallized pellets or agglomerate it passes through
After the processes such as broken, grinding and magnetic separation, fine iron breeze is obtained, then return among smelting iron and steel.
In addition, smelting copper ashes tapping temperature at 1150-1370 DEG C, specific heat capacity is about 1.1kJ/kgK, the total excess heat of ton slag
50kg standard coals (7000 kilocalories/kg) are equivalent to, residual heat resources are more.《Energy-saving and emission-reduction " 12 planning "》、《Industrial energy saving
" 12 planning "》Etc. in relevant policies file, mention the recycling to industrial and mining enterprises' waste heat energy, and in country " ten
During First Five-Year Plan ", state revenue is also given surplus energy utility and is subsidized.However, low, large viscosity, thermal transition efficiency by slag thermal conductivity
Low factor influences, and mostly existing slag research is to recycling high-temperature residual heat after slag progress dry granulation, and engineering application is also
There are great difficulties.Therefore, it to this part of waste heat energy in copper ashes of coming out of the stove, is passed in above-mentioned copper ashes roasting reduction-grinding magnetic separation
Also there is not embodiment in system research technique, and in copper ashes reducing roasting process, also want reheating, causes the huge wave of the energy
Take.
Have much room for improvement as a result, using the method that copper ashes prepares reduced iron.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, one object of the present invention
It is to propose that a kind of system preparing reduced iron, the system prepare reduced iron by raw material of molten copper slag, heat utilization efficiency is high, production
It is low with operating cost.
According to an aspect of the present invention, the present invention provides a kind of systems preparing reduced iron.Reality according to the present invention
Example is applied, which includes：Slagging device, the slagging device have molten copper slag entrance, additive entrance, fluxing agent entrance,
Blender and the outlet of mixed melting copper ashes；Pelletizer, the pelletizer have granulation material inlet, stream cinder hole and slag particle outlet,
The granulation material inlet is connected with mixed melting copper ashes outlet；Reduction roasting device, the reduction roasting device have
Slag particle entrance, reducing agent entrance, flue dust outlet and reducing material outlet, the slag particle entrance are connected with slag particle outlet；It is dry
Formula concentration equipment, the dry type magnetic separation device has reducing material entrance, metallized pellet outlet and carbonaceous material outlet, described
Reducing material entrance is connected with reducing material outlet；Slag sluicing system device, the slag sluicing system device have metallization ball
Group's entrance, reduced iron outlet and slag-drip opening, the metallized pellet entrance are connected with metallized pellet outlet.
The system according to the ... of the embodiment of the present invention for preparing reduced iron solves conventional high-temperature copper ashes using molten copper slag as raw material
It can just continue the problem handled after needing water quenching cooling or slow cooling, high-grade iron product and zinc oxide dust is prepared,
Not only realize metallic element high-efficiency comprehensive utilization in copper ashes, but also the waste heat for realizing molten copper slag efficiently uses, system
Heat utilization efficiency is high.Also, additive entrance and fluxing agent entrance are set in slagging device, i.e. to high temperature melting before heat treatment
Melt and additive and fluxing agent are added in copper ashes, slag can be made to homogenize by the stirring of blender, directly adjusts the inside of copper ashes
Structure and chemical composition improve the metallurgical performance of copper ashes, then through high temperature granulated processed, you can are reduced directly for reduction roasting device
High heat is provided and is granulated copper ashes raw material, the techniques such as pelletizing, drying and pelletizing preheating is eliminated, shortens going back for reduction roasting device
Former time, the energy consumption for reducing reduction roasting device, reduce production and operating cost.
In addition, the system according to the above embodiment of the present invention for preparing reduced iron can also have following additional technology special
Sign：
According to an embodiment of the invention, which further comprises：Storage facility, the storage facility, which has, introduces stream slag
Grain, scum hole and extraction stream slag grain, the introducing stream slag grain are connected with mixed melting copper ashes outlet, and slag grain is flowed in the extraction
It is connected with the granulation material inlet.
According to an embodiment of the invention, the slag sluicing system device is to grind to select separator or melt to divide separator.
According to another aspect of the present invention, it is prepared also using the system above-mentioned for preparing reduced iron the present invention provides a kind of
The method of former iron.According to an embodiment of the invention, this method includes：The molten copper slag that copper smelting-furnace is discharged is fed directly to institute
Slagging device is stated, is mixed and is heated with additive and fluxing agent, to obtain mixed melting copper ashes；It will be described
Mixed melting copper ashes is delivered to pelletizer and carries out granulated processed, to obtain slag particle；The slag particle is delivered to reduction roasting dress
It sets, is contacted with reducing agent, reduction roasting processing is carried out, to obtain flue dust and reducing material；By the reducing material through dry type
Magnetic separator carries out dry type magnetic separation separation, to obtain metallized pellet and carbonaceous material；And the metallized pellet is carried out
Slag sluicing system, to obtain reduced iron and slag.
The method according to the ... of the embodiment of the present invention for preparing reduced iron solves conventional high-temperature copper ashes using molten copper slag as raw material
It can just continue the problem handled after needing water quenching cooling or slow cooling, high-grade iron product and zinc oxide dust is prepared,
The high-efficiency comprehensive utilization for realizing copper ashes, realizes the UTILIZATION OF VESIDUAL HEAT IN of molten copper slag, and the heat utilization efficiency of method is high.Also, it is heating
Additive is mixed with molten copper slag before processing, slag can be made to homogenize by the stirring of blender, directly adjusts copper ashes
Internal structure and chemical composition improve the metallurgical performance of copper ashes, then through high temperature granulated processed, you can are provided for reduction roasting processing
High heat is granulated copper ashes raw material, the techniques such as pelletizing, drying and pelletizing preheating is eliminated, when shortening the reduction of reduction roasting device
Between, reduce the energy consumption of reduction roasting device, reduce production and operating cost.Reduced iron is prepared using this method as a result, is made
The Iron grade of standby obtained reduced iron is high, and utilization rate of waste heat is high, and less energy consumption, technological process is simple, and production cost is low.
According to an embodiment of the invention, the quality of the gross mass of the additive and the fluxing agent and the molten copper slag
Than for (5~25)：100.
According to an embodiment of the invention, the temperature of the molten copper slag is 1150~1350 DEG C.
According to an embodiment of the invention, the temperature of the mixed melting copper ashes is 1350~1450 DEG C.
According to an embodiment of the invention, the mass ratio of the additive and the fluxing agent is (5~20)：(0~5).
According to an embodiment of the invention, the average grain diameter of the slag particle is 5~20mm, and temperature is 800~1000 DEG C.
According to an embodiment of the invention, the slag sluicing system is that mill ore magnetic selection detaches or molten point detaches.
The additional aspect and advantage of the present invention will be set forth in part in the description, and will partly become from the following description
Obviously, or practice through the invention is recognized.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination following accompanying drawings to embodiment
Obviously and it is readily appreciated that, wherein：
Fig. 1 shows the structural schematic diagram of the system according to an embodiment of the invention for preparing reduced iron；
Fig. 2 shows the structural schematic diagram of the system for preparing reduced iron according to another embodiment of the invention；
Fig. 3 shows the method that the system that the utilization according to another embodiment of the invention prepares reduced iron prepares reduced iron
Flow diagram.
Specific implementation mode
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings, and is only
For ease of description the present invention rather than require the present invention must be with specific azimuth configuration and operation, therefore should not be understood as pair
The limitation of the present invention.
The system for preparing reduced iron
According to an aspect of the present invention, the present invention provides a kind of systems preparing reduced iron.With reference to figure 1, according to this
The system is explained in the embodiment of invention, which includes：Slagging device 100, pelletizer 200, reduction roasting dress
Set 300, dry type magnetic separation device 400 and slag sluicing system device 500.
According to an embodiment of the invention, slagging device 100 have molten copper slag entrance, additive entrance, fluxing agent entrance,
Blender and the outlet of mixed melting copper ashes, in slagging device 100, molten copper slag is mixed using blender with additive and fluxing agent
Stirring is closed, and is heated, mixed melting copper ashes is obtained.As a result, by slagging device be arranged additive entrance and
Fluxing agent entrance is added additive and fluxing agent into high-temperature fusion copper ashes before heat treatment, passes through the stirring of blender
Slag can be made to homogenize, directly adjust the internal structure and chemical composition of copper ashes, improve the metallurgical performance of copper ashes, then through high temperature grain
Change is handled, you can is provided high heat for reduction roasting device direct-reduction and is granulated copper ashes raw material, eliminates pelletizing, drying and pelletizing
Preheating etc. techniques, shorten the recovery time of reduction roasting device, reduce the energy consumption of reduction roasting device, reduce production and
Operating cost.
Wherein, it should be noted that molten copper slag can be that Copper making processing directly obtains, and can also be other smeltings
The hot substance of cupric obtained by the reaction.
According to an embodiment of the invention, pelletizer 200 has granulation material inlet, stream cinder hole and slag particle outlet, wherein grain
Change material inlet with the outlet of mixed melting copper ashes to be connected, mixed melting copper ashes is subjected to granulated processed.Since the grain size of raw material is small,
The temperature for advantageously reducing reduction roasting carries out granulated processed to mixed melting copper ashes by pelletizer, makes mixed melting copper ashes
It is granulated into the slag particle of small particle, convenient for reducing the energy consumption of subsequent reduction roasting.
According to a particular embodiment of the invention, which can be revolving cup pelletizer, the revolving cup pelletizer circumferential wall
Face be equipped with stream cinder hole, high-temperature slag can be made to throw away in high-speed rotation process, and after air-cooled solidification formed grain size be 5~
The hot slag particle of 15mm.Granulation effect is good as a result, and efficient, obtained hot slag particle can directly carry out reduction roasting, promotes
The progress of heat transfer and reduction reaction, shortens the time of reduction reaction, further decreases the energy consumption of reduction roasting processing.The temperature of slag particle
Degree is 800~1000 DEG C, and hot slag particle can directly carry out reduction roasting, promotes heat transfer and the progress of reduction reaction, is shortened also
The time of original reaction, further decrease the energy consumption of reduction roasting processing.
According to some embodiments of the present invention, there is reduction roasting device 300 slag particle entrance, reducing agent entrance, flue dust to go out
Mouth and reducing material outlet, wherein slag particle entrance is connected with slag particle outlet, and reduction roasting device 300 is for going back slag particle
Former calcination process makes the oxide of iron be reduced to reduced iron.
According to a particular embodiment of the invention, reduction roasting device is rotary hearth furnace, which roasts with medium temperature
Burn area and high-temperature roasting area, wherein medium temperature roast area has flue, and bag filter is provided in flue.In turn, slag particle is through receiving
After collection can directly heat be distributed into bottom and be covered on the rotary hearth furnace material bed of reducing agent, fabric thickness is 10~40mm, and hot slag particle is turning
In the stove of bottom after middle warm area, high-temperature region are heated to 1150~1350 DEG C, 20~40min is kept, direct reduction reactor is completed and generates
Metallized pellet, and recycle to obtain the oxidation of high economic value by the way that the bag filter in rotary hearth furnace middle warm area flue is arranged
Zinc powder dirt, the Zn content of the zinc oxide dust is up to 52% or more, and then discharge turns together for metallized pellet and remaining carbonaceous material
Outside the stove of bottom.
According to a particular embodiment of the invention, there is dry type magnetic separation device 400 reducing material entrance, metallized pellet to export
It is exported with carbonaceous material, wherein reducing material entrance is connected with reducing material outlet, and dry type magnetic separation device 400 will be for that will restore
Metallized pellet and carbonaceous material in material are detached, and metallized pellet and carbonaceous material are obtained.To metallize ball as a result,
Group separates from reducing material.
According to a particular embodiment of the invention, slag sluicing system device 500 have metallized pellet entrance, reduced iron outlet and
Slag-drip opening, wherein metallized pellet entrance is connected with metallized pellet outlet, and slag sluicing system device 500 is for the ball that will metallize
Group carries out slag sluicing system, obtains reduced iron and slag.Reduced iron is separated from metallized pellet as a result,.
According to an embodiment of the invention, slag sluicing system device 500 is to grind to select separator or melt to divide separator, wherein
Mill selects separator that there is mill to select solid product entrance, fine grinding powder outlet, magnetic separation material inlet and magnetic separation product outlet, mill choosing
Solid product entrance is connected with metallized pellet outlet, carries out fine grinding processing to metallized pellet, obtains fine grinding material, fine grinding object
Material outlet is connected with magnetic separation material inlet, and magnetic separation processing is carried out to fine grinding material, so that material is finely ground, after magnetic separation separation
Obtain reduction iron product；It is molten to divide separator that there is metallized pellet entrance, melt and divide iron outlet and melting slag outlet, wherein gold
Belong to pellet entrance with metallized pellet outlet to be connected, to realize the molten separation for dividing iron, melting slag by intermittent take-off mode,
Obtain reduction iron product.
The system according to the ... of the embodiment of the present invention for preparing reduced iron solves conventional high-temperature copper ashes using molten copper slag as raw material
It can just continue the problem handled after needing water quenching cooling or slow cooling, high-grade iron product and zinc oxide dust is prepared,
The high-efficiency comprehensive utilization for realizing copper ashes, realizes the UTILIZATION OF VESIDUAL HEAT IN of molten copper slag, and the heat utilization efficiency of system is high.Also, in slugging
Additive entrance and fluxing agent entrance are set on device, additive and fluxing agent are added in slugging processing procedure, is directly adjusted
The internal structure and chemical composition of whole copper ashes improve the metallurgical performance of copper ashes, then through high temperature granulated processed, you can are reduction roasting
Device direct-reduction provides high heat and is granulated copper ashes raw material, eliminates the techniques such as pelletizing, drying and pelletizing preheating, shortens reduction
The recovery time of calciner, the energy consumption for reducing reduction roasting device, reduce production and operating cost.
With reference to figure 2, according to an embodiment of the invention, which further comprises：Storage facility 600, storage facility 600 have
There are introducing stream slag grain, scum hole and draw stream slag grain, wherein introduces stream slag grain and be connected with the outlet of mixed melting copper ashes, draw stream
Slag grain is connected with granulation material inlet, is introduced into slag trough for the high-temperature molten slag copper ashes in slagging device 100 to be introduced storage
Device 200 draws slag trough and is used to the high-temperature slag in storage facility 200 leading to granulating device 200.Storage is utilized as a result,
Cryopreservation device carries out intermediate storage to mixed melting copper ashes, ensures that mixed melting copper ashes enters subsequent grain with continual and steady flow velocity
Makeup is set.
According to a particular embodiment of the invention, introducing stream slag grain and drawing slag trough has heat insulation function.Copper is avoided as a result,
The thermal loss of slag, heat utilization efficiency are high.
The method for preparing reduced iron
According to another aspect of the present invention, it is prepared also using the system above-mentioned for preparing reduced iron the present invention provides a kind of
The method of former iron.With reference to figure 3, according to an embodiment of the invention, which is explained, this method
Including：
S100 heats
According to an embodiment of the invention, the molten copper slag that copper smelting-furnace is discharged is fed directly to slagging device, with addition
Agent and fluxing agent are mixed and are heated, and obtain mixed melting copper ashes.Inventor passes through into high-temperature fusion copper ashes
Additive and fluxing agent is added, directly adjusts the internal structure and chemical composition of copper ashes, improves the metallurgical performance of copper ashes, then through height
Warm granulated processed, you can for reduction roasting device direct-reduction provide high heat be granulated copper ashes raw material, eliminate pelletizing, drying and
The techniques such as pelletizing preheating, shorten the recovery time of reduction roasting device, reduce the energy consumption of reduction roasting device, reduce life
Production and operating cost.
According to an embodiment of the invention, the gross mass of additive and the fluxing agent and the mass ratio of the molten copper slag are
(5~25)：100.After additive and fluxing agent and molten copper slag are mixed in the ratio as a result, molten copper slag can be made by stirring
Internal structure and chemical composition change, the mixed melting copper ashes to be homogenized further increases the metallurgical of copper ashes
Can, reduction reaction temperature is reduced, the progress of sequential reduction reaction is conducive to.
According to an embodiment of the invention, the mass ratio of additive and fluxing agent is (5~20)：(0~5).Additive as a result,
After being mixed in the ratio with fluxing agent, the internal structure of molten copper slag and chemical composition can be made to change by stirring, obtained
The mixed melting copper ashes to homogenize further increases the metallurgical performance of copper ashes, reduces reduction reaction temperature, is conducive to sequential reduction
The progress of reaction.
According to some embodiments of the present invention, additive is selected from least one of lime stone or quick lime, fluxing agent
To be selected from least one of calcined soda for industry or fluorite.It can not be added in copper ashes Direct Reduction as a result, eliminate and make
The techniques such as ball, drying and pelletizing preheating shorten the recovery time of reduction roasting device, reduce the energy consumption of reduction roasting device, drop
Low production and operating cost.
According to an embodiment of the invention, the temperature of molten copper slag is not particularly limited, as long as metallurgy etc. obtains
High-temperature fusion copper ashes, to, efficiently use the waste heat of molten copper slag.According to some embodiments of the present invention, molten copper
The temperature of slag is 1150~1350 DEG C.Low energy consumption for the processing such as utilization rate of waste heat is high as a result, and subsequent heat is smelted.
According to an embodiment of the invention, the temperature of the mixed melting copper ashes is 1350~1450 DEG C.Thus, it can be ensured that mixed
It closes molten copper slag fully to homogenize, good material condition is provided for follow-up direct-reduction.
S200 granulated processeds
According to an embodiment of the invention, mixed melting copper ashes is delivered to pelletizer and carries out granulated processed, obtain slag particle.Hair
A person of good sense has found suitable raw material particle size, advantageously reduces the temperature of reduction roasting, while the gas permeability of reduction reaction is also preferable, because
This can provide grain size suitable slag particle by granulated processed for direct-reduction, convenient for reducing the energy consumption of subsequent reduction roasting, changing
Kind reduction effect.
According to an embodiment of the invention, the average grain diameter of slag particle is 5~20mm, and temperature is 800~1000 DEG C.The grain of raw material
Diameter is smaller, more advantageously reduces the temperature and time of reduction roasting, by granulated processed, mixed melting copper ashes is made to be granulated into granule
The slag particle of diameter, convenient for reducing the energy consumption of subsequent reduction roasting.But grain size is too small, and the gas permeability of direct reduction reactor is caused to become
Difference, to directly affect reduction effect, when the average grain diameter of slag particle is 5~20mm, the temperature of reduction roasting is low, and the time is short.
The temperature of slag particle is 800~1000 DEG C, and hot slag particle can directly carry out reduction roasting, promote heat transfer and reduction reaction into
Row, shortens the time of reduction reaction, further decreases the energy consumption of reduction roasting processing.
S300 reduction roastings are handled
According to an embodiment of the invention, slag particle is delivered to reduction roasting device, is contacted with reducing agent, carry out reduction roasting
Processing, to obtain flue dust and reducing material, wherein reducing material is made of metallized pellet and carbonaceous material.It utilizes as a result,
Reduction roasting device carries out reduction roasting processing to slag particle, and the oxide of iron is made to be reduced to reduced iron.
According to some embodiments of the present invention, reduction roasting device is rotary hearth furnace, which roasts with medium temperature
Burn area and high-temperature roasting area, wherein medium temperature roast area has flue, and bag filter is provided in flue.In turn, slag particle is through receiving
After collection can directly heat be distributed into bottom and be covered on the rotary hearth furnace material bed of reducing agent, fabric thickness is 10~40mm, and hot slag particle is turning
In the stove of bottom after middle warm area, high-temperature region are heated to 1150~1350 DEG C, 20~40min is kept, direct reduction reactor is completed and generates
Metallized pellet, and recycle to obtain the oxidation of high economic value by the way that the bag filter in rotary hearth furnace middle warm area flue is arranged
Zinc powder dirt, the Zn content of the zinc oxide dust is up to 52% or more, and then discharge turns together for metallized pellet and remaining carbonaceous material
Outside the stove of bottom.
S400 dry type magnetic separations detach
According to an embodiment of the invention, the reducing material is subjected to dry type magnetic separation, obtains metallized pellet and carbon containing object
Matter.Metallized pellet is separated from reducing material as a result, so that metallized pellet carries out subsequent slag sluicing system.
S500 slag sluicing systems
According to an embodiment of the invention, the metallized pellet is subjected to slag sluicing system, obtains reduced iron and slag.As a result,
Reduced iron is separated from metallized pellet.
According to an embodiment of the invention, slag sluicing system is that mill ore magnetic selection detaches or molten point detaches.Wherein, mill ore magnetic selection detaches
Metallized pellet is subjected to fine grinding processing, obtains fine grinding material, magnetic separation processing is carried out to fine grinding material, so that material is through thin
Reduction iron product is obtained after mill, magnetic separation separation；Molten point of separation divides separator using molten, by molten point of processing of combustion gas, between utilization
Discharge method of having a rest realizes the molten separation for dividing iron, melting slag, obtains reduction iron product.
Below with reference to specific embodiment, the present invention will be described, it should be noted that these embodiments are only explanation
Property, and be not considered as limiting the invention.
Embodiment 1
Reduced iron is prepared as raw material using the high-temperature fusion copper ashes being discharged in copper smelting-furnace, the specific method is as follows：
(1) the high-temperature fusion copper ashes for being 1150~1350 DEG C by the temperature being discharged out of copper smelting-furnace, it is hot directly to pour into
In slugging stove；
(2) temperature in slugging stove is warming up to 1400~1450 DEG C, by slugging furnace roof portion charge door, is added into stove
Copper ashes weight 10%, the graininess quick lime and fluorite that granularity is 5~10mm, wherein the mass ratio of quick lime and fluorite is
5：5, meanwhile, it is inserted into slag using the mechanical agitation paddle for being applied with refractory material, 10min is stirred to the mixed material in molten bath
Afterwards, the concurrent heating into stove again, heat preservation 10min are fully homogenized, the mixed melting copper ashes after being homogenized.
(3) copper ashes after homogenizing is poured into tundish, and is flowed into pelletizer through cinder notch, control pelletizer rotational speed of rotor
In 3000~3100 turns/min, the hot slag particle of solidification is discharged from pelletizer, granularity is 5~10mm, and temperature is 950~1000
℃。
(4) hot slag particle bottom surface is uniformly packed into be covered on anthracitic rotary furnace bottom, hot slag particle layer thickness 10~
20mm；Hot slag particle after middle warm area, high-temperature region are heated to 1150~1250 DEG C, keeps 20min in rotary hearth furnace, completes direct
Reduction reaction generates metallized pellet, and is recycled by the way that the bag filter in rotary hearth furnace middle warm area flue is arranged and aoxidized
Zinc powder dirt, Zn content 52%, metallized pellet and remaining carbonaceous material are then discharged outside rotary hearth furnace together.
(5) product of rotary hearth furnace discharge is after waste heat recovery, then through the isolated metallized pellet of dry type magnetic separation and carbon containing
Substance, metallized pellet directly carry out mill ore magnetic selection, and the reduction iron product of TFe 91%, iron recovery 85% can be obtained.
Embodiment 2
Reduced iron is prepared as raw material using the high-temperature fusion copper ashes being discharged in copper smelting-furnace, the specific method is as follows：
(1) the high-temperature fusion copper ashes for being 1150~1350 DEG C by the temperature being discharged out of copper smelting-furnace, it is hot directly to pour into
In slugging stove.
(2) temperature in slugging stove is warming up to 1380~1430 DEG C, by slugging furnace roof portion charge door, is added into stove
Copper ashes weight 13%, granularity be 10~15mm lime stone and calcined soda for industry, wherein lime stone：The mass ratio of calcined soda for industry
It is 10：3, meanwhile, it is inserted into slag using the mechanical agitation paddle for being applied with refractory material, the mixed material in molten bath is stirred
After 20min, the concurrent heating into stove again, heat preservation 10min is fully homogenized, the mixed melting copper ashes after being homogenized.
(3) copper ashes after homogenizing is poured into tundish, and is flowed into pelletizer through cinder notch, control pelletizer rotational speed of rotor
In 3000~3100 turns/min；The hot slag particle of solidification is discharged from pelletizer, granularity is 10~15mm, and temperature is 900~950
℃。
(4) hot slag particle bottom surface is uniformly packed into be covered on anthracitic rotary furnace bottom, hot slag particle layer thickness 20~
30mm, hot slag particle after middle warm area, high-temperature region are heated to 1200~1300 DEG C, keep 30min in rotary hearth furnace, complete direct
Reduction reaction generates metallized pellet, and is recycled by the way that the bag filter in rotary hearth furnace middle warm area flue is arranged and aoxidized
Zinc powder dirt, Zn content 54%, metallized pellet and remaining carbonaceous material are then discharged outside rotary hearth furnace together.
(5) product of rotary hearth furnace discharge is after waste heat recovery, then through the isolated metallized pellet of dry type magnetic separation and carbon containing
Substance, metallized pellet directly carry out mill ore magnetic selection, and the reduction iron product of TFe 92%, iron recovery 88% can be obtained.
Embodiment 3
Reduced iron is prepared as raw material using the high-temperature fusion copper ashes being discharged in copper smelting-furnace, the specific method is as follows：
(1) the high-temperature fusion copper ashes for being 1150~1350 DEG C by the temperature being discharged out of copper smelting-furnace, it is hot directly to pour into
In slugging stove.
(2) temperature in slugging stove is warming up to 1350~1400 DEG C, by slugging furnace roof portion charge door, is added into stove
Copper ashes weight 20%, granularity be 15~20mm caustic lime block, using be applied with refractory material mechanical agitation paddle be inserted into slag
In, after the mixed material stirring 20min in molten bath, the concurrent heating into stove again, heat preservation 10min is fully homogenized, after obtaining homogenizing
Mixed melting copper ashes.
(3) copper ashes after homogenizing is poured into tundish, and is flowed into pelletizer through cinder notch, control pelletizer rotational speed of rotor
In 3000~3100 turns/min；It is discharged the hot slag particle of solidification from pelletizer, granularity is 15~20mm, temperature is 950~
1000℃。
(4) hot slag particle bottom surface is uniformly packed into be covered on anthracitic rotary furnace bottom, hot slag particle layer thickness 30~
40mm；Hot slag particle after middle warm area, high-temperature region are heated to 1250~1350 DEG C, keeps 40min in rotary hearth furnace, completes direct
Reduction reaction generates metallized pellet, and is recycled by the way that the bag filter in rotary hearth furnace middle warm area flue is arranged and aoxidized
Zinc powder dirt, Zn content 56%, metallized pellet and remaining carbonaceous material are then discharged outside rotary hearth furnace together.
(5) product of rotary hearth furnace discharge is after waste heat recovery, then through the isolated metallized pellet of dry type magnetic separation and carbon containing
Substance, metallized pellet is hot directly to carry out molten point, and the reduction iron product of TFe 94%, iron recovery 96% can be obtained.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiments or example in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not
In the case of being detached from the principle of the present invention and objective a variety of change, modification, replacement and modification can be carried out to these embodiments, this
The range of invention is limited by claim and its equivalent.
Claims (10)
1. a kind of system preparing reduced iron, which is characterized in that including：
Slagging device, the slagging device have molten copper slag entrance, additive entrance, fluxing agent entrance, blender and mixing
Molten copper slag exports；
Pelletizer, the pelletizer have granulation material inlet, stream cinder hole and slag particle outlet, the granulation material inlet with it is described
The outlet of mixed melting copper ashes is connected；
There is slag particle entrance, reducing agent entrance, flue dust outlet and reducing material to go out for reduction roasting device, the reduction roasting device
Mouthful, the slag particle entrance is connected with slag particle outlet；
There is reducing material entrance, metallized pellet outlet and carbonaceous material to go out for dry type magnetic separation device, the dry type magnetic separation device
Mouthful, the reducing material entrance is connected with reducing material outlet；
Slag sluicing system device, the slag sluicing system device have metallized pellet entrance, reduced iron outlet and slag-drip opening, the gold
Belong to pellet entrance with metallized pellet outlet to be connected.
2. system according to claim 1, which is characterized in that further comprise：
Storage facility, the storage facility, which has, introduces slag trough, scum hole and extraction slag trough, the introducing slag trough and institute
It states the outlet of mixed melting copper ashes to be connected, the extraction slag trough is connected with the granulation material inlet.
3. system according to claim 1, which is characterized in that the slag sluicing system device is that mill selects separator or molten point point
From device.
4. a kind of method that the system preparing reduced iron using claim 1-3 any one of them prepares reduced iron, feature
It is, including：
The molten copper slag that copper smelting-furnace is discharged is fed directly to slagging device, is mixed and carries out with additive and fluxing agent
Heat treatment, to obtain mixed melting copper ashes；
The mixed melting copper ashes is delivered to pelletizer and carries out granulated processed, to obtain slag particle；
The slag particle is delivered to reduction roasting device, is contacted with reducing agent, carry out reduction roasting processing, so as to obtain flue dust and
Reducing material；
The reducing material is subjected to dry type magnetic separation separation through dry-type magnetic extractor, to obtain metallized pellet and carbonaceous material；
And
The metallized pellet is subjected to slag sluicing system, to obtain reduced iron and slag.
5. according to the method described in claim 4, it is characterized in that, the gross mass of the additive and the fluxing agent with it is described
The mass ratio of molten copper slag is (5~25)：100.
6. according to the method described in claim 4, it is characterized in that, the temperature of the molten copper slag is 1150~1350 DEG C.
7. according to the method described in claim 4, it is characterized in that, the temperature of the mixed melting copper ashes is 1350~1450
℃。
8. according to the method described in claim 4, it is characterized in that, the mass ratio of the additive and the fluxing agent be (5~
20)：(0~5), wherein the additive is selected from least one of lime stone and quick lime, and the fluxing agent is choosing
From at least one of calcined soda for industry and fluorite.
9. according to the method described in claim 4, it is characterized in that, the average grain diameter of the slag particle is 5~20mm, temperature is
800~1000 DEG C.
10. according to the method described in claim 4, it is characterized in that, the slag sluicing system is mill ore magnetic selection separation or molten point point
From.
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| CN112934478B (en) * | 2021-03-17 | 2023-02-10 | 安徽工业大学 | Method for recovering iron ore concentrate in copper slag and copper floating tailings by microwave low-temperature reduction roasting |
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| CN103088209A (en) * | 2013-03-01 | 2013-05-08 | 中南大学 | Floating and smelting combined method for air-granulating lead smelting slag and utilizing waste heat |
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| 转底炉处理铜渣回收铁、锌技术研究;刘占华等;《第六届尾矿与冶金渣综合利用技术研讨会暨衢州市项目招商对接会会议论文集》;20150820;第168页倒数第1段-第169页图1.1 * |
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