CN106399667B - A kind of system and method for processing troilite - Google Patents
A kind of system and method for processing troilite Download PDFInfo
- Publication number
- CN106399667B CN106399667B CN201611040595.9A CN201611040595A CN106399667B CN 106399667 B CN106399667 B CN 106399667B CN 201611040595 A CN201611040595 A CN 201611040595A CN 106399667 B CN106399667 B CN 106399667B
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- rotary hearth
- hearth furnace
- discharge port
- furnace
- troilite
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Classifications
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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
- C22B1/02—Roasting processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
Abstract
The present invention discloses a kind of system and method for processing troilite.The system includes atomizer mill, ball press, drying device and rotary hearth furnace, and atomizer mill includes discharge port；Ball press includes feeding mouth and discharge port；Drying device includes feeding mouth and discharge port；Rotary hearth furnace includes feeding mouth, discharge port, exhanst gas outlet and barricade, barricade is located in the furnace body of rotary hearth furnace, annular space in furnace body is divided into oxidizing roasting area and reduction roasting area, rotary hearth furnace feeding mouth is located at oxidizing roasting area, rotary hearth furnace discharge port is located at reduction roasting area, and exhanst gas outlet is located at oxidizing roasting area.The system and method for the present invention realize the oxidizing roasting and reduction roasting of troilite in rotary hearth furnace, and reduction effect is good, and collect the flue gas of rotary hearth furnace generation, for manufacturing sulfuric acid.
Description
Technical field
The invention belongs to technical field of smelting more particularly to a kind of system and method for processing troilite.
Background technology
Sulfuric acid is that one kind being important the raw material of industry, can be used for manufacturing fertilizer, drug, explosive, pigment, detergent, electric power storage
Pond etc..Troilite is the main sulphur source in China, and the comparison of large storage capacity concentrates on mainly being distributed provinces and regions and is followed successively by Sichuan, Anhui, interior
Illiteracy, Guangdong and Yunnan, total resources are at the forefront in the world up to 127.8 hundred million tons.
It will produce pyrite cinder (also known as sulfate slag) in the production process of sulfuric acid, be the main of chemical industry production
One of solid waste.A large amount of pyrite cinders that China generates every year mostly use greatly landfill processing, not only occupy a large amount of soil
Ground, and serious pollution is caused to environment.Meanwhile 20%~60% iron that pyrite cinder contains also is not recycled
It utilizes.
Recently as the fast development of steel industry, China increases the mining inetesity of iron mineral resource, resource grade
Iron ore deposit high, that sorting is good just gradually decreases, and mineral resources can be supplied to ability continuous decrease.Active development difficulty utilizes iron ore
Stone resource can effectively expand the available iron ore resource amount in China, reduce external dependence degree, ensure the peace of ferrolite supply
Entirely.
A kind of existing method and its device with producing iron refined powder from troilite is the base in existing production sulfuric acid apparatus
On plinth, increase raw material mixing system, using fluidized bed furnace be discharged slag, by calculating ratio incorporation troilite in, and with it is other at
Divide and be mixed into stove roasting, product is sulfuric acid, also can get Iron concentrate.The Iron concentrate degree of metalization that this technique obtains is low.
Invention content
The invention is intended to propose a kind of system and method for processing troilite, the oxidation roasting of troilite is realized in rotary hearth furnace
Burning and reduction roasting, reduction effect is good, and degree of metalization is high, obtains metallized pellet, and collects the flue gas of rotary hearth furnace generation, is used for
Manufacture sulfuric acid.
An object of the present invention is to provide a kind of system of processing troilite, including atomizer mill, ball press, drying device
And rotary hearth furnace；The atomizer mill includes discharge port；The ball press includes feeding mouth and discharge port；The drying device include into
Material mouth and discharge port；The rotary hearth furnace includes feeding mouth, discharge port, exhanst gas outlet and barricade,
The barricade is located in the furnace body of the rotary hearth furnace, and the annular space in the furnace body is divided into oxidizing roasting area
With reduction roasting area, the rotary hearth furnace feeding mouth is located at the oxidizing roasting area, and the rotary hearth furnace discharge port is located at the reduction
Roast area, the exhanst gas outlet are located at the oxidizing roasting area；
The atomizer mill discharge port connects the ball press feeding mouth, and the ball press discharge port connects the drying device
Feeding mouth, the drying device discharge port connect the rotary hearth furnace feeding mouth.
Atomizer mill is used to for troilite to be finely ground to the granularity needed for subsequent processing.Ball press is used for the troilite of fine grinding
Grain pelletizing.Drying device is used for the drying of pelletizing, prepares for follow-up roasting.Rotary hearth furnace is used for the oxidizing roasting of troilite and goes back
Original roasting.
The furnace bottom of rotary hearth furnace is rotatable, and the furnace bottom of rotation drives material movement in stove.Troilite dry bulb group is entered by rotary hearth furnace
Material mouth enters oxidizing roasting area, reduction roasting area is entered after oxidized roasting, the metallized pellet after reduction roasting is through rotary hearth furnace
Rotary hearth furnace is discharged in discharge port.Exhanst gas outlet is used to collect the flue gas manufacture sulfuric acid of rotary hearth furnace oxidizing roasting area generation.
In the present invention, the rotary hearth furnace further comprises that reducing agent entrance, the reducing agent entrance are located at reduction roasting
Burn furnace roof of the area far from discharge port end.
Specifically, the radian of the oxidizing roasting area rotary hearth furnace annular space is 150 °~180 °.
Further, the sector region radian between the rotary hearth furnace feeding mouth and rotary hearth furnace discharge port is 10 °~15 °.
As a preferred option, the barricade bottom is 10~20cm at a distance from the furnace bottom upper surface of the rotary hearth furnace.
The distance of barricade bottom to the furnace bottom upper surface of rotary hearth furnace should ensure passing through for material, ensure oxidizing roasting area gas again
Atmosphere and reduction roasting area atmosphere do not interfere with each other.
In the present invention, oxidizing roasting carries out in oxidizing atmosphere, so that certain ingredients in ore is occurred by roasting
Oxidation reaction generates new oxide.Troilite (FeS2) in the middle roasting for a long time of oxidizing atmosphere (or being passed through large quantity of air)
With O2It reacts and generates magnetic iron ore (Fe3O4), magnetic iron ore is easier to be reduced.
It is a further object of the present invention to provide a kind of methods handling troilite using above system, include the following steps：
A, by troilite fine grinding pressure ball, dry bulb group is obtained after dry；
B, dry bulb group is sent into the rotary hearth furnace, first carries out oxidizing roasting desulfurization, carry out reduction roasting afterwards, obtain gold
Belong to pellet, reducing agent enters rotary hearth furnace by the reducing agent entrance, will when the dry bulb is rolled into a ball and enters the reduction roasting area
The dry bulb rolls into a ball one layer of reducing agent of uniform fold；The flue gas in oxidizing roasting area is collected for manufacturing sulfuric acid.
Specifically, rotary hearth furnace oxidizing roasting area temperature be 800~1000 DEG C, reduction roasting area temperature be 1200~
1300 DEG C, the furnace bottom of the rotary hearth furnace rotates a circle the time as 2~5h.
As a preferred option, the troilite is finely ground to the quality hundred that the troilite of the mesh of granularity≤200 accounts in step A
Divide ratio 80% or more.
Further, the dry bulb granule diameter is 10~20mm.
As a preferred option, in the reducing agent carbon mass component be not less than 80%, the reducing agent granularity be 2~
5mm。
As a preferred option, blast oxygen in oxidizing roasting, the oxygen volume blasted be volume of fuel 10~
15%.
The system and method for a kind of processing troilite provided by the invention, after troilite is prepared pelletizing, in rotary hearth furnace
Oxidizing roasting is integrally completed with reduction roasting；Reduction roasting area makes full use of the sensible heat that oxidizing roasting area dry bulb is rolled into a ball, and reduces energy
Consumption；Troilite restores roasting after desulfurization aoxidizes, and degree of metalization is high；Make raw material using troilite, to expand the money of iron ore
Source utilizes and creates condition.
Description of the drawings
Fig. 1 is the system schematic of present invention processing troilite；
Fig. 2 is rotary hearth furnace reduction agent entrance partial schematic diagram of the present invention；
Fig. 3 is the method schematic diagram of the system processing troilite of the present invention.
In figure：
1- atomizer mills；2- ball press；3- drying devices；4- rotary hearth furnaces；
401- rotary hearth furnace feeding mouths；402- rotary hearth furnace discharge ports；403- exhanst gas outlets；404- barricades；
405- oxidizing roastings area；406- reduction roastings area；407- reducing agent entrances.
Specific implementation mode
Below in conjunction with drawings and examples, the specific implementation mode of the present invention is described in more details, so as to energy
The advantages of enough more fully understanding the solution of the present invention and its various aspects.However, specific embodiments described below and implementation
Example is for illustrative purposes only, rather than limiting the invention.
As shown in Figure 1, on the one hand, the embodiment of the present invention provides a kind of system of processing troilite, including atomizer mill 1, pressure
Ball machine 2, drying device 3 and rotary hearth furnace 4.
Atomizer mill 1 includes feeding mouth and discharge port.Atomizer mill 1 is used to for troilite to be finely ground to the grain needed for subsequent processing
Degree.
Ball press 2 includes feeding mouth and discharge port.Ball press 2 is used for troilite particle pelletizing.Spherical material is more sharp
In the thermally equivalent in rotary hearth furnace.Suitable pellet size keeps pelletizing heat transfer good, reaches good reduction effect.
Drying device 3 includes feeding mouth and discharge port.Drying device 3 is used for the drying of pelletizing, prepares for follow-up roasting.
Rotary hearth furnace 4 is used for the oxidizing roasting and reduction roasting of dry bulb group, obtains metallized pellet.
As depicted in figs. 1 and 2, rotary hearth furnace 4 includes feeding mouth 401, discharge port 402, exhanst gas outlet 403, barricade 404 and goes back
Former agent entrance 407.
Barricade 404 is located in the furnace body of rotary hearth furnace 4, and the annular space in furnace body is divided into oxidizing roasting area 405 and is gone back
Former roast area 406, rotary hearth furnace feeding mouth 401 are located at oxidizing roasting area 405, and rotary hearth furnace discharge port 402 is located at reduction roasting area
406, exhanst gas outlet 403 is located at oxidizing roasting area 405, and reducing agent entrance 407 is located at reduction roasting area 406 far from discharge port end
Furnace roof.
The flue gas that dry bulb group generates in 405 desulfurization of oxidizing roasting area oxidation is collected by exhanst gas outlet 403, can be used for manufacturing sulphur
Acid.
Dotted arrow in Fig. 1 and Fig. 2 indicates the direction of motion of material in rotary hearth furnace.The rotation of 4 furnace bottom of rotary hearth furnace drives
Material movement.In the embodiment of the present invention, troilite dry bulb group (material) enters oxidizing roasting area 405 by rotary hearth furnace feeding mouth 401,
Enter reduction roasting area 406 after oxidized roasting, rotary hearth furnace is discharged through rotary hearth furnace discharge port 402 in the dry bulb group after reduction roasting.
As shown in Fig. 2, reducing agent entrance 407 is located at furnace roof, enter rotary hearth furnace 4 convenient for reducing agent.Reducing agent entrance 407 is set
It sets in reduction roasting area 406 far from rotary hearth furnace discharge port end, has certain distance with barricade 404 so that dry bulb group enters reduction quilt
It can be contacted with reducing agent when burning area 406.
1 discharge port of atomizer mill connects 2 feeding mouth of ball press, and 2 discharge port of ball press connects 3 feeding mouth of drying device, dry
3 discharge port of device connects 4 feeding mouth of rotary hearth furnace.
Specifically, the radian of 405 rotary hearth furnace annular space of oxidizing roasting area is 150 °~180 °.
Sector region radian between rotary hearth furnace feeding mouth 401 and rotary hearth furnace discharge port 402 is 10 °~15 °.Rotary hearth furnace 4
The quantity of middle barricade is two, wherein a dams setting is between rotary hearth furnace feeding mouth 401 and rotary hearth furnace discharge port 402
In sector region.
As the preferred scheme of the embodiment of the present invention, 404 bottom of barricade is 10 at a distance from the furnace bottom upper surface of rotary hearth furnace
~20cm.The distance of 404 bottom of barricade to the furnace bottom upper surface of rotary hearth furnace should ensure passing through for material, ensure oxygen again
Change roast area atmosphere and reduction roasting area atmosphere does not interfere with each other.
On the other hand, as shown in figure 3, the embodiment of the present invention provides a kind of method handling troilite using above system,
Include the following steps：
1, troilite is finely ground to the granular mass percentage of the mesh of granularity≤200 80% or more, pressure ball obtains after dry
Dry bulb group, dry bulb granule diameter are 10~20mm；
2, dry bulb is rolled into a ball and is sent into rotary hearth furnace, first carry out oxidizing roasting desulfurization, carry out reduction roasting afterwards, obtain metallization ball
Group, oxidizing roasting area temperature is 800~1000 DEG C, and blasts the oxygen of volume of fuel 10~15%, and reduction roasting area temperature is
1200~1300 DEG C, the furnace bottom of rotary hearth furnace rotates a circle the time as 2~5h, and reducing agent enters rotary hearth furnace by reducing agent entrance,
Dry bulb is rolled into a ball into one floor reducing agent of uniform fold when dry bulb group enters reduction roasting area, collects the flue gas in oxidizing roasting area for manufacturing
Sulfuric acid.
As the preferred scheme of the embodiment of the present invention, the mass component of carbon is not less than 80% in reducing agent, reducing agent granularity
For 2~5mm.
The system and method for processing troilite provided in an embodiment of the present invention, after troilite is prepared pelletizing, in rotary hearth furnace
Interior completion oxidizing roasting and reduction roasting；Reduction roasting area makes full use of the sensible heat that oxidizing roasting area dry bulb is rolled into a ball, and reduces energy consumption；
Troilite restores roasting after desulfurization aoxidizes, and the degree of metalization of metallized pellet is high；Make raw material using troilite, to expand iron
The utilization of resources of ore creates condition.
Embodiment 1
Certain troilite is milled to the granular mass accounting 82.31% of the mesh of granularity≤200, pressure ball (pelletizing grain size 10mm) is done
Entered by rotary hearth furnace feeding mouth after dry, oxidizing roasting area radian is 150 °, and temperature controls 900 DEG C, blasts the 10% of volume of fuel
Oxygen, reduction roasting area temperature control 1300 DEG C, and furnace bottom rotates a circle the time as 5h, and the dry bulb group after oxidizing roasting enters reduction
When roast area, the reduction coal (mass component of C：82.03%, granularity 2mm) from reducing agent entrance it is paved with dry bulb group, it is paved with reduction coal
Dry bulb group reduction roasting area be reduced into metallized pellet from rotary hearth furnace discharge port be discharged, by oxidizing roasting area fume extraction
It is used to prepare sulfuric acid.
Embodiment 2
Certain troilite is milled to the granular mass accounting 83.55% of the mesh of granularity≤200, pressure ball (pelletizing grain size 15mm) is done
Entered by rotary hearth furnace feeding mouth after dry, oxidizing roasting area radian is 160 °, and temperature controls 800 DEG C, blasts the 12% of volume of fuel
Oxygen, reduction roasting area temperature control 1200 DEG C, and furnace bottom rotates a circle the time as 3h, and the dry bulb group after oxidizing roasting enters reduction
When roast area, the reduction coal (mass component of C：80.26%, granularity 3mm) from reducing agent entrance it is paved with dry bulb group, it is paved with reduction coal
Dry bulb group reduction roasting area be reduced into metallized pellet from rotary hearth furnace discharge port be discharged, by oxidizing roasting area fume extraction
It is used to prepare sulfuric acid.
Embodiment 3
Certain troilite is milled to the granular mass accounting 81.25% of the mesh of granularity≤200, pressure ball (pelletizing grain size 20mm) is done
Entered by rotary hearth furnace feeding mouth after dry, oxidizing roasting area radian is 170 °, and temperature controls 1000 DEG C, blasts the 15% of volume of fuel
Oxygen, reduction roasting area temperature control 1300 DEG C, and furnace bottom rotates a circle the time as 2h, and the dry bulb group after oxidizing roasting enters reduction
When roast area, the reduction coal (mass component of C：83.26%, granularity 5mm) from reducing agent entrance it is paved with dry bulb group, it is paved with reduction coal
Dry bulb group reduction roasting area be reduced into metallized pellet from rotary hearth furnace discharge port be discharged, by oxidizing roasting area fume extraction
It is used to prepare sulfuric acid.
It should be noted that each embodiment above by reference to described in attached drawing be only to illustrate the present invention and unrestricted
The range of invention, it will be understood by those of ordinary skill in the art that, it is right under the premise without departing from the spirit and scope of the present invention
The modification or equivalent replacement that the present invention carries out, should all cover within the scope of the present invention.In addition, signified unless the context
Outside, the word occurred in the singular includes plural form, and vice versa.In addition, unless stated otherwise, then any embodiment
All or part of is used in combination with all or part of of any other embodiment.
Claims (10)
1. a kind of system of processing troilite, including atomizer mill, ball press, drying device and rotary hearth furnace,
The atomizer mill includes discharge port；
The ball press includes feeding mouth and discharge port；
The drying device includes feeding mouth and discharge port；
The rotary hearth furnace includes feeding mouth, discharge port, exhanst gas outlet and barricade,
The barricade is located in the furnace body of the rotary hearth furnace, and the annular space in the furnace body is divided into oxidizing roasting area and is gone back
Former roast area, the rotary hearth furnace feeding mouth are located at the oxidizing roasting area, and the rotary hearth furnace discharge port is located at the reduction roasting
Area, the exhanst gas outlet are located at the oxidizing roasting area；
The atomizer mill discharge port connects the ball press feeding mouth, and the ball press discharge port connects the drying device pan feeding
Mouthful, the drying device discharge port connects the rotary hearth furnace feeding mouth.
2. system according to claim 1, which is characterized in that the rotary hearth furnace further comprises reducing agent entrance, described
Reducing agent entrance is located at the furnace roof of the reduction roasting area far from discharge port end.
3. system according to claim 1, which is characterized in that the radian of the oxidizing roasting area rotary hearth furnace annular space is
150 °~180 °.
4. system according to claim 1, which is characterized in that between the rotary hearth furnace feeding mouth and rotary hearth furnace discharge port
Sector region radian is 10 °~15 °.
5. system according to claim 1, which is characterized in that the furnace bottom upper surface of the barricade bottom and the rotary hearth furnace
Distance be 10~20cm.
6. a kind of method handling troilite using any system of Claims 1 to 55, which is characterized in that including step：
A, by troilite fine grinding pressure ball, dry bulb group is obtained after dry；
B, dry bulb group is sent into the rotary hearth furnace, first carries out oxidizing roasting desulfurization, carries out reduction roasting afterwards, metallized
Pelletizing, reducing agent enter rotary hearth furnace by the reducing agent entrance, will be described when the dry bulb is rolled into a ball and enters the reduction roasting area
One layer of reducing agent of dry bulb group's uniform fold；The flue gas in oxidizing roasting area is collected for manufacturing sulfuric acid.
7. according to the method described in claim 6, it is characterized in that, rotary hearth furnace oxidizing roasting area temperature is 800~1000
DEG C, reduction roasting area temperature is 1200~1300 DEG C, and the furnace bottom of the rotary hearth furnace rotates a circle the time as 2~5h.
8. according to the method described in claim 6, it is characterized in that, the troilite is finely ground to the mesh of granularity≤200 in step A
The mass percent that accounts for of troilite 80% or more.
9. according to the method described in claim 6, it is characterized in that, the dry bulb granule diameter is 10~20mm.
10. according to the method described in claim 6, it is characterized in that, in the reducing agent carbon mass component be not less than 80%,
The reducing agent granularity is 2~5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040595.9A CN106399667B (en) | 2016-11-22 | 2016-11-22 | A kind of system and method for processing troilite |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611040595.9A CN106399667B (en) | 2016-11-22 | 2016-11-22 | A kind of system and method for processing troilite |
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| CN106399667A CN106399667A (en) | 2017-02-15 |
| CN106399667B true CN106399667B (en) | 2018-11-02 |
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| CN105671328B (en) * | 2016-03-25 | 2017-11-07 | 江苏省冶金设计院有限公司 | Handle the rotary hearth furnace and method of lead and zinc smelting dreg |
| CN206256115U (en) * | 2016-11-22 | 2017-06-16 | 江苏省冶金设计院有限公司 | A kind of system for processing troilite |
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