CN205907285U - System for direct reduction handles iron raw matercal - Google Patents
System for direct reduction handles iron raw matercal Download PDFInfo
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- CN205907285U CN205907285U CN201620831590.7U CN201620831590U CN205907285U CN 205907285 U CN205907285 U CN 205907285U CN 201620831590 U CN201620831590 U CN 201620831590U CN 205907285 U CN205907285 U CN 205907285U
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Abstract
The utility model discloses a system for direct reduction handles iron raw matercal, include: first mixed forming device, the mixed forming device of second, rotary hearth furnace, partition wall, link joint conveyor and broken magnetic separation device, wherein, first mixed forming device has the export of iron raw matercal pelletizing, the mixed forming device of second has the export of high sulfur coal pelletizing, the rotary hearth furnace includes rotatable stove bottom, annular furnace and link joint conveyor, and in annular furnace, the rotation direction of following rotatable stove bottom forms a feeding area, desulfurization district, the 2nd feeding area, reducing zone and ejection of compact district in proper order, and a feeding area has iron raw matercal pelletizing entry and high sulfur coal pelletizing entry, and the 2nd feeding area has the low -sulfur coal entry, link joint conveyor sets up in a feeding area and desulfurization district. Adopt this system can accomplish raw materials desulfurization and electronation reaction simultaneously, improved the efficiency of handling iron raw matercal.
Description
Technical field
The utility model belongs to the energy and field of metallurgy.Specifically, the process that the utility model is related to be reduced directly contains
The system of iron material.
Background technology
In recent years, direct reduction processes of Iron ores development is swift and violent, wherein coal base rotary hearth furnace direct reduction processes of Iron ores also high speed
Development, advances process of industrialization.The manageable mineral of rotary hearth furnace are enriched, it is possible to use resource category is various.But have a lot
When containing higher sulphur in iron-bearing material, and adopting carbon containing ball press technique in coal-based direct reduction ironmaking technology, coal also can carry
Enter substantial amounts of sulphur, lead to sulfur content in the raw material of stove to increase severely.Because general coal base reduction equipment is reducing atmosphere, unfavorable
In desulfurization, substantial amounts of sulfur reducing agent, not only DeGrain can only be added in carbonaceous pelletizing, and increased reduction load, band
Enter more impurity.In prior art, have some researchs to the sulphur in DRI, but due to metallized pellet gangue and
Iron coexists, and does not therefore have what good method under normal circumstances to drop except the sulphur in pelletizing, simply places hope on containing carbon ball
Sulphur in group volatilizees naturally, or passively adopts low-sulfur ore deposit, low-sulfur coal, unfavorable to steel-making metallized pellet ground to reduce sulphur
Impact.
Utility model content
The utility model is intended at least solve one of technical problem in correlation technique to a certain extent.For this reason, this reality
It is to propose a kind of system of high-efficiency desulfurization reduction treatment iron-bearing material with a new purpose.
According to one side of the present utility model, the utility model proposes a kind of direct-reduction process iron-bearing material is
System, this system includes:
First mixed-forming device, described first mixed-forming device have iron-bearing material entrance, lime stone entrance, first
Binding agent entrance and the outlet of iron-bearing material pelletizing；
Second mixed-forming device, described second mixed-forming device have sulphur coal entrance, the second binding agent entrance and
High-sulfur briquet exports；
Rotary hearth furnace, described rotary hearth furnace includes:
Rotatable stove bottom；
Annular furnace, in described annular furnace, the rotation direction along described rotatable stove bottom sequentially forms the first charging
Area, desulfurization zone, the second charging zone, reducing zone and discharge zone, described first charging zone has iron-bearing material pelletizing entrance and height
Sulphur briquet entrance, described desulfurization zone has sulfur-containing smoke gas outlet, and described second charging zone has low-sulfur coal entrance, described discharging
Area has reduzate outlet, and wherein, described iron-bearing material pelletizing entrance is connected with the outlet of described iron-bearing material pelletizing, described height
Sulphur briquet entrance is connected and is suitable to cloth on described rotatable stove bottom with the outlet of described high-sulfur briquet；
Chain plate conveyer, described chain plate conveyer is arranged in described first charging zone and described desulfurization zone, and
The feed end of described chain plate conveyer is connected with described iron-bearing material pelletizing entrance, and the discharge end of described chain plate conveyer leans on
Closely described second charging zone；
Crushing-magnetic selection device, described crushing-magnetic selection device has reduzate entrance, metal iron powder outlet and tailings outlet,
Described reduzate entrance is connected with the outlet of described reduzate.
Direct-reduction according to the utility model above-described embodiment processes the system of iron-bearing material specifically according to following step
Suddenly carry out, prepare iron-bearing material pelletizing initially with the first mixed-forming device, prepared using the second mixed-forming device
Obtain high-sulfur briquet；Then iron-bearing material pelletizing is distributed on the chain plate conveyer of rotary hearth furnace, and high-sulfur briquet is distributed into
On the rotatable stove bottom of rotary hearth furnace, the two carries out completing respective desulfurization respectively under the oxidizing atmosphere in rotary hearth furnace desulfurization zone,
And complete the iron-bearing material pelletizing after desulfurization to fall down from chain plate conveyer, cloth is on the high-sulfur briquet after desulfurization；?
Afterwards in the second charging zone, the iron-bearing material pelletizing after desulfurization arranges one layer of low-sulfur coal, and form reduction in reducing zone
Property atmosphere, iron content pelletizing is carried out with reduction treatment, reduzate through crushing-magnetic selection separate obtain metal iron powder.
Generally containing the processing system of iron ore raw material or method is that directly iron-bearing material and reduction coal are carried out reduction treatment,
And in iron-bearing material contain substantial amounts of sulphur, and sulphur removal efficiency is very low under reducing atmosphere, so leading to final products metal iron powder
Middle sulfur content is high.Individually set in rotary hearth furnace in the system of direct-reduction process iron-bearing material of the utility model above-described embodiment
Put desulfurization zone, and chain plate conveyer has been set, iron-bearing material and reduction coal can be carried out pre- desulfurization respectively, such that it is able to
To the low-sulfur metal iron powder of high-quality, low-sulfur metal iron powder more can meet the demand of steel-making, have higher economic worth.And by
In desulfurization individually can be carried out to reduction coal using this system, therefore using sulphur coal as reducing agent, and then can widen
The selection of reducing agent, reduces the cost of reducing agent simultaneously.Thus, the direct-reduction of the utility model above-described embodiment processes iron content
It is higher that the system of raw material efficiently solves sulfur content in metal iron powder in mill ore magnetic selection after coal-based direct reduction, value
Little problem.
In addition, according to the system that the direct-reduction of the utility model above-described embodiment processes iron-bearing material can also have as
Lower additional technical characteristic:
In some embodiments of the present utility model, described chain plate conveyer is arranged parallel to described rotatable stove bottom.
In some embodiments of the present utility model, the distance between described chain plate conveyer and described rotatable stove bottom
For 5～30cm, preferably 8～12cm.
In some embodiments of the present utility model, between described desulfurization zone and described first charging zone and described desulfurization zone
It is respectively arranged with partition wall and described second charging zone between.
In some embodiments of the present utility model, the top of described desulfurization zone has oxygen-enriched entrance, described desulfurization zone
Bottom has micro- oxygen entrance.
Brief description
Fig. 1 shows that the structure of the system that the direct-reduction according to one embodiment of the utility model processes iron-bearing material is shown
It is intended to.
Fig. 2 shows the rotary hearth furnace part-structure schematic diagram according to one embodiment of the utility model.
Fig. 3 shows the flow process of the method for the direct-reduction process iron-bearing material according to one embodiment of the utility model
Figure.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of described embodiment is shown in the drawings, wherein ad initio
To the element that same or similar label represents same or similar element or has same or like function eventually.Below by ginseng
The embodiment examining Description of Drawings is exemplary it is intended to be used for explaining the utility model, and it is not intended that to the utility model
Restriction.
According to one side of the present utility model, the utility model proposes a kind of direct-reduction process iron-bearing material is
System, the direct-reduction describing the utility model specific embodiment in detail below with reference to Fig. 1-2 processes the system of iron-bearing material.
The system that direct-reduction according to the utility model specific embodiment processes iron-bearing material includes: the first mixed-forming
Device 100, the second mixed-forming device 200, rotary hearth furnace 300 and crushing-magnetic selection device 700.
Wherein, the first mixed-forming device 100 has iron-bearing material entrance 110, lime stone entrance 120, the first binding agent
Entrance 130 and iron-bearing material pelletizing outlet 140；
Second mixed-forming device 200 has sulphur coal entrance 210, the second binding agent entrance 220 and high-sulfur briquet and goes out
Mouth 230；
Rotary hearth furnace 300 includes: rotatable stove bottom 400, annular furnace 500 and chain plate conveyer 600.
Wherein, in annular furnace 500, along rotatable stove bottom 400 rotation direction sequentially form the first charging zone 510,
Desulfurization zone 520, the second charging zone 530, reducing zone 540 and discharge zone 550, the first charging zone 510 has iron-bearing material pelletizing
Entrance 511 and high-sulfur briquet entrance 512, desulfurization zone 520 has sulfur-containing smoke gas outlet 521, and the second charging zone 530 has low-sulfur
Coal entrance 531, discharge zone 550 has reduzate outlet 551, wherein, iron-bearing material pelletizing entrance 511 and iron-bearing material pelletizing
Outlet 140 is connected, and high-sulfur briquet entrance 512 is connected and is suitable to cloth on rotatable stove bottom 400 with high-sulfur briquet outlet 230
Material；Chain plate conveyer 600 is arranged in the first charging zone 510 and desulfurization zone 520, and the charging of chain plate conveyer 600
End is connected with iron-bearing material pelletizing entrance 140, and the discharge end of chain plate conveyer 600 is near the second charging zone 530；
Crushing-magnetic selection device 700 has reduzate entrance 710, metal iron powder outlet 720 and tailings outlet 730, reduction
Product inlet 710 is connected with reduzate outlet 551.
Direct-reduction according to the utility model above-described embodiment processes the system of iron-bearing material specifically according to following step
Suddenly carry out, prepare iron-bearing material pelletizing initially with the first mixed-forming device 100, using the second mixed-forming device
200 prepare high-sulfur briquet；Then iron-bearing material pelletizing is distributed on the chain plate conveyer 600 of rotary hearth furnace 300, high-sulfur
Briquet is distributed on the rotatable stove bottom 400 of rotary hearth furnace, the two oxidizing atmosphere in rotary hearth furnace 300 desulfurization zone 520 respectively
Under carry out completing respective desulfurization, and complete the iron-bearing material pelletizing after desulfurization and fall down from chain plate conveyer 600, cloth exists
On high-sulfur briquet after desulfurization；Finally in the second charging zone 530, the iron-bearing material pelletizing after desulfurization arranges one layer low
Sulphur coal, and form reducing atmosphere in reducing zone 540, iron-bearing material pelletizing is carried out with reduction treatment, reduzate is through broken
Concentration equipment 700 separates and obtains metal iron powder.
Generally containing the processing system of iron ore raw material or method is that directly iron-bearing material and reduction coal are carried out reduction treatment,
And in iron-bearing material contain substantial amounts of sulphur, and sulphur removal efficiency is very low under reducing atmosphere, so leading to final products metal iron powder
Middle sulfur content is high.Individually set in rotary hearth furnace in the system of direct-reduction process iron-bearing material of the utility model above-described embodiment
Put desulfurization zone, and chain plate conveyer has been set, iron-bearing material and reduction coal can be carried out pre- desulfurization respectively, such that it is able to
To the low-sulfur metal iron powder of high-quality, low-sulfur metal iron powder more can meet the demand of steel-making, have higher economic worth.And by
In desulfurization individually can be carried out to reduction coal using this system, therefore using sulphur coal as reducing agent, and then can widen
The selection of reducing agent, reduces the cost of reducing agent simultaneously.Thus, the direct-reduction of the utility model above-described embodiment processes iron content
It is higher that the system of raw material efficiently solves sulfur content in metal iron powder in mill ore magnetic selection after coal-based direct reduction, value
Little problem.
According to specific embodiment of the utility model, chain plate conveyer 600 is arranged parallel to rotatable stove bottom 400.By
This can improve the stable operation of rotary hearth furnace further.Specifically, between chain plate conveyer 600 and rotatable stove bottom 400
Distance can be 5～30cm, and preferably between chain plate conveyer 600 and rotatable stove bottom 400, distance is 8～12cm.Carrier bar is defeated
Send device 600 too close to rotatable stove bottom 400, would interfere with the rotation at rotatable stove bottom 400, and apart from rotatable stove bottom 400
Hypertelorism, then the iron-bearing material pelletizing after desulfurization rotatable stove bottom 400 is fallen to by the discharge end of chain plate conveyer 600
When drop apart from long.
According to specific embodiment of the utility model, when iron-bearing material pelletizing is supplied on chain plate conveyer 600
When, stop in desulfurization zone 520 for the iron-bearing material pelletizing can be controlled by controlling the transmission speed of chain plate conveyer 600
Time.Thus, it is possible to make iron-bearing material pelletizing that desulphurization reaction fully to occur.
According to the specific embodiment of this utility model, between desulfurization zone 520 and the first charging zone 510, it is provided with partition wall
560, it is provided with partition wall 570 between desulfurization zone 520 and the second charging zone 530.According to embodiment of the present utility model, in order to enter one
Step improves the desulfuration efficiency of iron-bearing material pelletizing, and it is as long as possible that the length of chain plate conveyer 600 can be arranged.For example, may be used
The feeding end of chain plate conveyer 600 to be arranged on the initial segment of the first charging zone 510, by going out of chain plate conveyer 600
Material end is positioned close at partition wall 570.Specifically, can keep suitable between the discharge end of chain plate conveyer 600 and partition wall 570
Work as distance, be specifically as follows 15～40mm it is therefore preferable to 18～32mm.Above-mentioned apart from narrow, then desulfurization product can be hindered smooth
Drop to rotatable stove bottom 400 and enter the second charging zone 530；If apart from wide, the length of chain plate conveyer 600 can be led to
Reduce.Thus, it is possible to extend the length of chain plate conveyer 600, thus extend iron-bearing material pelletizing stopping in desulfurization zone 520 as far as possible
The time stayed, such that it is able to carry the desulfurized effect of iron-bearing material further.
According to the specific embodiment of this utility model, the top of desulfurization zone 520 has oxygen-enriched entrance 522.Iron-bearing material
In sulphur mainly presented in sulfide and sulfate.Oxygen is passed through by the oxygen-enriched entrance 522 on desulfurization zone 520 top
So that the upper space of desulfurization zone forms strong oxidizing atmosphere, the upper strata furnace temperature simultaneously controlling desulfurization zone 520 is 900-1100 to gas
℃.So that iron-bearing material pelletizing passes through oxidizing roasting in this region, existed with sulphided form in removing iron ore
Sulphur, is first decomposed at high temperature with the sulphur that sulphate form exists, then with flue gas removing.Meanwhile, the lime stone in pelletizing divides
Solution, the sulfide that the calcium oxide of production can not removed with a part reacts, and generates calcium sulfide, the residual sulfur in removing raw material.
According to the specific embodiment of this utility model, the bottom of desulfurization zone 520 has micro- oxygen entrance 523.In sulphur coal
Sulphur mainly presented in pyritic sulfur and organic sulfur.Oxygen is passed through by the micro- oxygen entrance 523 in desulfurization zone 520 bottom
With nitrogen mixture so that the lower space of desulfurization zone forms micro-oxidizing atmosphere, lower floor's furnace temperature of control desulfurization zone 520 is simultaneously
300-700℃.So that under micro-oxidizing atmosphere, in coal, sulphur forms sulfur dioxide effusion.Wherein it is passed through oxygen and nitrogen
Ratio is 1-10:90-99.
The direct-reduction of the utility model above-described embodiment processes the system of iron-bearing material, by turning in rotary hearth furnace
The top setting chain plate conveyer of dynamic furnace bottom, thus form double-layer cloth, and by cloth on the rotatable stove bottom of lower floor
High-sulfur briquet, in cloth iron-bearing material pelletizing on the chain plate conveyer on upper strata.Make the two single respectively in desulfurization zone
Solely complete desulfurization process.And oxidation can be provided further by being passed through the oxygen of different proportion to desulfurization zone upper and lower
Property atmosphere, realize the control of independent desulfurization condition, so improve desulfurized effect.
According to specific embodiment of the utility model, by arranging the second charging zone in rotary hearth furnace, to completing after desulfurization
Iron-bearing material pelletizing one layer of low-sulfur coal of upper cloth.So that the levels of the iron-bearing material pelletizing after desulfurization are respectively provided with reduction
Agent, improves the contact area of iron-bearing material pelletizing and reducing agent, simultaneously so that forming strong reducing property atmosphere in reducing zone,
The final reduction effect improving iron-bearing material pelletizing, improves iron recovery.
Thus, the system of iron-bearing material is processed using the direct-reduction of the utility model above-described embodiment, bottom can turned
Realize pre- desulfurization process and reduction treatment to iron-bearing material in stove, and then treatment effeciency can be significantly improved, significantly reduce simultaneously
Sulfur content in product, and then improve reduced iron quality.
Understand that the direct-reduction of the utility model above-described embodiment processes the system of iron-bearing material, below to profit for convenience
The method that with this system, iron-bearing material is carried out being reduced directly with process is described.
According to specific embodiment of the utility model, the method that direct-reduction processes iron-bearing material includes: mixed using first
Iron-bearing material, lime stone, the first binding agent are carried out mixed-forming process by synthetic device, to obtain iron-bearing material pelletizing；
Using the second mixed-forming device, sulphur coal, the second binding agent are carried out mixed-forming process, to obtain high-sulfur briquet；Profit
With rotary hearth furnace, iron-bearing material pelletizing is processed；Wherein, supplied on chain plate conveyer by iron-bearing material pelletizing entrance
Iron-bearing material pelletizing；High-sulfur briquet is supplied on rotatable stove bottom by high-sulfur briquet entrance；By low-sulfur coal entrance to
Low-sulfur coal is supplied in second charging zone；Wherein, iron-bearing material pelletizing and high-sulfur briquet is made to carry out oxidizing roasting in desulfurization zone,
So that removing sulphur, produce sulfur-containing smoke gas, improve the reactivity of iron-bearing material pelletizing；Make the iron-bearing material pelletizing through oxidizing roasting
Depart from chain plate conveyer in the end of desulfurization zone and cover on the high-sulfur briquet after removing sulphur；Make through oxidizing roasting
Iron-bearing material pelletizing, when in the second charging zone, is capped one layer of low-sulfur coal, to obtain prereduction material；Make prereduction
There is reduction reaction in material in reducing zone, to obtain reduzate.Using crushing-magnetic selection device, reduzate is broken
Broken and magnetic separation is processed, to obtain metal iron powder and tailings.
The method that the direct-reduction describing the utility model specific embodiment in detail below with reference to Fig. 3 processes iron-bearing material.
S100: prepare iron-bearing material pelletizing
According to the specific embodiment of this utility model, first with the first mixed-forming device by iron-bearing material, lime
Stone, the first binding agent carry out mixed-forming process, to obtain iron-bearing material pelletizing.Wherein, iron-bearing material, lime stone, first
The mass ratio of binding agent is 100:5-20:1-10.Thus effectively iron-bearing material can be prepared into pelletizing.Meanwhile, by adding
Enter lime stone, the calcium oxide that lime stone subsequent decomposition produces, calcium oxide can be reacted with the sulfide not removed, and generates sulfuration
Calcium, thus remove the residual sulfur in raw material.Iron-bearing material desulfurized effect thus can be improved further.
S200: prepare high-sulfur carbon pellets
According to the specific embodiment of this utility model, using the second mixed-forming device by sulphur coal, the second binding agent
Carry out mixed-forming process, to obtain high-sulfur briquet.Wherein, the mass ratio of sulphur coal and the second binding agent is 100:2-
10.Thus can effectively prepare high-sulfur briquet, improve pellet strength, and then improve treatment effeciency.
S300: oxidizing roasting desulfurization
According to the specific embodiment of this utility model, using rotary hearth furnace, iron-bearing material pelletizing is processed.Wherein, lead to
Cross iron-bearing material pelletizing entrance and iron-bearing material pelletizing is supplied on chain plate conveyer；By high-sulfur briquet entrance to rotatable
High-sulfur briquet is supplied on furnace bottom.
Wherein, iron-bearing material pelletizing and high-sulfur briquet is made to carry out oxidizing roasting in desulfurization zone, to remove sulphur and to carry
The reactivity of high iron-bearing material pelletizing, produces sulfur-containing smoke gas.
The method processing iron-bearing material using the direct-reduction of the utility model above-described embodiment, have in rotary hearth furnace can
Rotary furnace bottom and the chain plate conveyer of top setting, and then in cloth high-sulfur briquet on the rotatable stove bottom of lower floor,
In cloth iron-bearing material pelletizing on the chain plate conveyer on upper strata, form double-layer cloth.Such that it is able to realize the list of the two
Solely desulfurization process.And then desulfurized effect can be improved further.
S400: reduction reaction
According to specific embodiment of the utility model, low-sulfur coal is supplied into the second charging zone by low-sulfur coal entrance.
According to specific embodiment of the utility model, make the iron-bearing material pelletizing through oxidizing roasting in the end of desulfurization zone
Depart from chain plate conveyer and cover on the high-sulfur briquet after removing sulphur；The iron-bearing material pelletizing through oxidizing roasting is made to exist
When in the second charging zone, it is capped one layer of low-sulfur coal, to obtain prereduction material；Make prereduction material in reducing zone
There is reduction reaction, to obtain reduzate.
According to specific embodiment of the utility model, after the completion of desulfurization, iron-bearing material pelletizing falls from chain plate conveyer
Lower cloth is above the cloth high-sulfur briquet on rotatable stove bottom.Further, by setting second charging in rotary hearth furnace
Area, to the one layer of low-sulfur coal of upper cloth completing the iron-bearing material pelletizing after desulfurization.So that iron-bearing material pelletizing after desulfurization
Levels are respectively provided with reducing agent, improve the contact area of iron-bearing material pelletizing and reducing agent, simultaneously so that in reducing zone
Form strong reducing property atmosphere, the final reduction effect improving iron-bearing material pelletizing, improve iron recovery.
Thus, the method processing iron-bearing material using the direct-reduction of the utility model above-described embodiment, can turn bottom
Realize pre- desulfurization process and reduction treatment to iron-bearing material in stove, and then treatment effeciency can be significantly improved, significantly reduce simultaneously
Sulfur content in product, and then improve reduced iron quality.
According to the specific embodiment of this utility model, the top of desulfurization zone 520 has oxygen-enriched entrance 522.Thus according to
The above-mentioned direct-reduction of the utility model process iron-bearing material method further include: by top from oxygen-enriched entrance to desulfurization zone
It is passed through oxygen, so that iron-bearing material pelletizing oxidizing roasting is occurred under strong oxidizing atmosphere and remove sulphur.
According to specific embodiment of the utility model, the sulphur in iron-bearing material is mainly deposited in the form of sulfide and sulfate
?.Oxygen is passed through by the oxygen-enriched entrance 522 on desulfurization zone 520 top so that the upper space of desulfurization zone forms Strong oxdiative gas
Atmosphere, controls the temperature on the top stating desulfurization zone to be 900-1100 degree Celsius simultaneously.So that iron-bearing material pelletizing is in this condition
Lower generation oxidizing roasting, the sulphur being existed with sulphided form in removing iron ore, with the sulphur of sulphate form presence first in high temperature
Under decomposed, then with flue gas removing.Meanwhile, the decomposition of limestone in pelletizing, the calcium oxide of production can not taken off with a part
The sulfide reaction removing, generates calcium sulfide, the residual sulfur in removing raw material.
According to the specific embodiment of this utility model, the bottom of desulfurization zone 520 has micro- oxygen entrance 523.Thus according to
The above-mentioned direct-reduction of the utility model process iron-bearing material method further include: by bottom from micro- oxygen entrance to desulfurization zone
It is passed through oxygen and nitrogen, so that high-sulfur briquet oxidizing roasting is occurred under micro-oxidizing atmosphere and remove sulphur.
According to the specific embodiment of this utility model, the sulphur in sulphur coal is mainly in the form of pyritic sulfur and organic sulfur
Exist.Oxygen and nitrogen mixture are passed through by the micro- oxygen entrance 523 in desulfurization zone 520 bottom so that the bottom of desulfurization zone is empty
Between formed micro-oxidizing atmosphere, simultaneously control desulfurization zone 520 bottom temperature be 300-700 degree Celsius.So that sulphur coal
Pelletizing under this condition oxidizing roasting occurs so that sulphur forms sulfur dioxide effusion in coal.Wherein it is passed through the ratio of oxygen and nitrogen
Example is 1-10:90-99.
In reducing zone, after desulfurization, iron-bearing material pelletizing falls into lower floor's furnace bottom, is distributed on the high-sulfur briquet after desulfurization, then
It is distributed into one layer of low-sulfur coal in upper strata pelletizing, through iron reducing zone, iron is reduced into metallic iron.Obtain the ball that metallizes from discharging opening
Group, the mixture of coal ash and coal ash pelletizing.It is distributed into the reducing atmosphere that low-sulfur coal is to ensure that pelletizing in reducing zone.
S500: crushing-magnetic selection
According to specific embodiment of the utility model, finally using crushing-magnetic selection device, reduzate is carried out broken and magnetic
Choosing is processed, to obtain metal iron powder and tailings.
According to specific example of the present utility model, reduzate will be obtained and sieved, obtain metallized pellet, by metal
Pellet carries out broken mill choosing, obtains metal iron powder and tailings.Because the sulphur in coal and iron-bearing material is removed in early stage, because
In this metal iron powder, sulfur content is low, disclosure satisfy that steel-making requirements, and then significantly improves the economic worth of metal iron powder.
According to specific embodiment of the utility model, the reducing agent that direct-reduction processes iron-bearing material can select high-sulfur
Coal, by carrying out desulfurization to sulphur coal while carrying out desulfurization to iron-bearing material, in the case of additionally not increasing operation
The qualified reducing agent obtaining.Therefore, method iron-bearing material being processed using the direct-reduction of the utility model above-described embodiment
Widen the range of choice of reducing agent, reduced the cost of reducing agent, and then indirectly reduce the cost processing iron-bearing material.
Embodiment 1
Certain Iron concentrate, its composition is tfe 67.69%, s 0.07%, by Iron concentrate: lime stone: binding agent=100:5:5
Proportioning mixing after pressure ball, obtain Iron concentrate pelletizing.Certain sulphur coal, its composition is fixed carbon 76%, s 0.6%, by sulphur coal:
Pressure ball after the proportioning mixing of binding agent=100:2, obtains high-sulfur briquet.Upper strata carrier bar Iron concentrate ball being distributed in stove is defeated
Send on device, high-sulfur briquet is distributed on lower floor's rotatable stove bottom, in the stove of upper strata, is passed through oxygen, temperature is 1000 DEG C, under
It is passed through the mixed gas of oxygen and nitrogen, oxygen: nitrogen=2:98, lower floor's in-furnace temperature is 500 DEG C in layer stove.Raw material in stove
After desulfurization zone removes sulphur respectively, Iron concentrate pelletizing is fallen on high-sulfur briquet, and is distributed into one layer of low-sulfur coal on Iron concentrate pelletizing,
After reduction, obtain the mixture of coal ash, coal briquette and metallized pellet, isolate metallized pellet after screening, pelletizing is entered
Row mill choosing, obtains tfe 92.13%, the metal iron powder of s 0.008%.
Embodiment 2
Certain copper ashes, its composition is tfe 39.57%, s 0.21%, by copper ashes: lime stone: binding agent=100:15:5's
Pressure ball after proportioning mixing, obtains copper ashes pelletizing.Certain sulphur coal, its composition is fixed carbon 70%, s 0.72%, by sulphur coal: viscous
Pressure ball after the proportioning mixing of knot agent=100:2, obtains high-sulfur briquet.Copper ashes pelletizing is distributed into the upper strata carrier bar conveying in stove
On device, high-sulfur briquet is distributed on lower floor's rotatable stove bottom, in the stove of upper strata, is passed through oxygen, temperature is 950 DEG C, lower floor's stove
Inside it is passed through the mixed gas of oxygen and nitrogen, oxygen: nitrogen=3:97, lower floor's in-furnace temperature is 600 DEG C.Desulfurization of raw material in stove
After area removes sulphur respectively, copper ashes pelletizing is fallen on high-sulfur briquet, and is distributed into one layer of low-sulfur coal on copper ashes pelletizing, through reduction
Afterwards, obtain the mixture of coal ash, coal briquette and metallized pellet, after screening, isolate metallized pellet, pelletizing is carried out mill choosing, obtains
Metal iron powder to tfe 91.09%, s 0.012%.
In description of the present utility model it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " suitable
The orientation of instruction such as hour hands ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship are based on orientation shown in the drawings
Or position relationship, be for only for ease of description the utility model and simplify description, rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include one or more this feature.In description of the present utility model, " multiple " are meant that two or two
More than, unless otherwise expressly limited specifically.
In the utility model, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
It is mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements.For the ordinary skill in the art, can basis
Concrete condition understands concrete meaning in the utility model for the above-mentioned term.
In the utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score
Can be the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " permissible
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height and be less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State that be not necessarily referring to is identical embodiment or example.And, the specific features of description, structure, material or feature can be
Combine in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, this area
The feature of the different embodiments described in this specification or example and different embodiment or example can be carried out by technical staff
In conjunction with and combination.
Although of the present utility model embodiment has been shown and described above it is to be understood that above-described embodiment is
Exemplary it is impossible to be interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
Interior above-described embodiment can be changed, change, replacing and modification.
Claims (6)
1. a kind of direct-reduction processes the system of iron-bearing material it is characterised in that including:
First mixed-forming device, described first mixed-forming device has iron-bearing material entrance, lime stone entrance, the first bonding
Agent entrance and the outlet of iron-bearing material pelletizing；
Second mixed-forming device, described second mixed-forming device has sulphur coal entrance, the second binding agent entrance and high-sulfur
Briquet exports；
Rotary hearth furnace, described rotary hearth furnace includes:
Rotatable stove bottom；
Annular furnace, in described annular furnace, the rotation direction along described rotatable stove bottom sequentially forms the first charging zone, takes off
Sulphur area, the second charging zone, reducing zone and discharge zone, described first charging zone has iron-bearing material pelletizing entrance and high-sulfur coal briquette
Group's entrance, described desulfurization zone has sulfur-containing smoke gas outlet, and described second charging zone has low-sulfur coal entrance, and described discharge zone has
Reduzate exports, and wherein, described iron-bearing material pelletizing entrance is connected with the outlet of described iron-bearing material pelletizing, described high-sulfur coal briquette
Group's entrance is connected and is suitable to cloth on described rotatable stove bottom with the outlet of described high-sulfur briquet；
Chain plate conveyer, described chain plate conveyer is arranged in described first charging zone and described desulfurization zone, and described
The feed end of chain plate conveyer is connected with described iron-bearing material pelletizing entrance, and the discharge end of described chain plate conveyer is near institute
State the second charging zone；
Crushing-magnetic selection device, described crushing-magnetic selection device has reduzate entrance, metal iron powder outlet and tailings outlet, described
Reduzate entrance is connected with the outlet of described reduzate.
2. direct-reduction according to claim 1 processes the system of iron-bearing material it is characterised in that the conveying of described carrier bar fills
Put parallel to the setting of described rotatable stove bottom.
3. direct-reduction according to claim 2 processes the system of iron-bearing material it is characterised in that the conveying of described carrier bar fills
Putting with the distance between described rotatable stove bottom is 5～30cm.
4. direct-reduction according to claim 3 processes the system of iron-bearing material it is characterised in that the conveying of described carrier bar fills
Putting with the distance between described rotatable stove bottom is 8～12cm.
5. direct-reduction according to claim 1 processes the system of iron-bearing material it is characterised in that described desulfurization zone and institute
State between the first charging zone and be respectively arranged with partition wall and described desulfurization zone and described second charging zone between.
6. according to claim 1 direct-reduction process iron-bearing material system it is characterised in that described desulfurization zone upper
Portion has oxygen-enriched entrance, and the bottom of described desulfurization zone has micro- oxygen entrance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620831590.7U CN205907285U (en) | 2016-08-01 | 2016-08-01 | System for direct reduction handles iron raw matercal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620831590.7U CN205907285U (en) | 2016-08-01 | 2016-08-01 | System for direct reduction handles iron raw matercal |
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| Publication Number | Publication Date |
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| CN205907285U true CN205907285U (en) | 2017-01-25 |
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| CN201620831590.7U Withdrawn - After Issue CN205907285U (en) | 2016-08-01 | 2016-08-01 | System for direct reduction handles iron raw matercal |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148625A (en) * | 2016-08-01 | 2016-11-23 | 江苏省冶金设计院有限公司 | Direct-reduction processes the system and method for iron-bearing material |
-
2016
- 2016-08-01 CN CN201620831590.7U patent/CN205907285U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148625A (en) * | 2016-08-01 | 2016-11-23 | 江苏省冶金设计院有限公司 | Direct-reduction processes the system and method for iron-bearing material |
| CN106148625B (en) * | 2016-08-01 | 2018-07-10 | 江苏省冶金设计院有限公司 | The system and method for direct-reduction processing iron-bearing material |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170125 Effective date of abandoning: 20180710 |
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| AV01 | Patent right actively abandoned |