CN113564353A - Iron ore powder agglomeration method and extrusion molding die - Google Patents
Iron ore powder agglomeration method and extrusion molding die Download PDFInfo
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- CN113564353A CN113564353A CN202110904826.0A CN202110904826A CN113564353A CN 113564353 A CN113564353 A CN 113564353A CN 202110904826 A CN202110904826 A CN 202110904826A CN 113564353 A CN113564353 A CN 113564353A
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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
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Abstract
The invention discloses an iron ore powder agglomeration method, which comprises the following steps: (1) adding water into iron ore powder, limestone powder, cement and a pore-forming agent, and uniformly mixing to ensure that the mixture has certain plasticity; (2) adding the plastic mixture into an extruder with the pressure of 4Mpa for vacuum treatment; (3) and connecting the extrusion molding die with an outlet of an extruder, driving a piston or a screw of the extruder to extrude the plastic mixture from a die hole of the extrusion molding die to obtain a columnar iron powder block, wherein the die hole is a taper hole, and the area of a feed end is larger than that of a discharge end. The invention also provides an extrusion molding die for iron ore powder agglomeration, wherein a plurality of die holes are arranged on the extrusion molding die, the die holes are taper holes, and the area of a feeding end is larger than that of a discharging end. The columnar powdered iron blocks are obtained by extruding the powdered iron blocks through an extruder with the extrusion pressure of more than 4Mpa, and the columnar powdered iron blocks are high in strength after being naturally dried, free of sintering, pollution-free, high in yield, energy-saving and ideal and consistent in furnace entering size.
Description
Technical Field
The invention belongs to the technical field of iron ore smelting, and particularly relates to an iron ore powder agglomeration method and an extrusion molding die.
Background
The iron ore powder agglomeration is to produce ore blocks with certain three-dimensional size meeting the smelting requirement by a manual method after the iron ore powder which can not be directly fed into the furnace is subjected to material mixing. Iron ore powder agglomeration is an important process link for raw material preparation before smelting, which enlarges the sources of smelting raw materials (such as steel rolling oxide skin, coke powder and the like) and improves the quality of the raw materials.
At present, iron ore powder agglomeration mainly comprises three types, namely sintering, pelletizing and mould pressing. The sintering is to mix the fine iron ore raw material with fuel and baking agent according to a certain proportion, add water to wet and mix evenly, then distribute on a sintering machine, through ignition and air draft, generate high temperature by means of fuel combustion in the sintering material, and then generate physical and chemical reaction to generate partial low melting point substance, form a certain amount of liquid phase, wet and bond the iron mineral particles, and form porous lump ore with certain strength after cooling.
The pellet is prepared by adding a proper amount of water and a binder into fine ore, preparing the pellet with uniform viscosity and sufficient strength, drying and roasting. The pelletizing method generally only processes iron ore concentrate with fine granularity, after bentonite is added, the grade of pellets is reduced, the slag amount of a blast furnace is increased, the use of the pellets in the blast furnace requires high-temperature oxidizing roasting at over 1250 ℃, a large amount of energy is consumed, carbon dioxide pollution is caused, meanwhile, the pellets are compact in structure, the reduction performance is lower than that of porous sintered ore, and the sintering process can process iron ore powder with various grain sizes, but the sintering yield is lower (only about 70%).
The mould pressing agglomeration is that iron ore powder, limestone powder, cement and pore-forming agent are added with water and uniformly mixed, then the mixture is placed in a rectangular mould to be pressed into lumps, after sintering, crushing and screening, the granularity reaches 5-20 mm, and the finished product is obtained, wherein the ingredients still need to be returned when the granularity is less than 5mm, so that the problems of energy source empty consumption, pollution, low agglomeration yield and the like also exist. Meanwhile, the productivity and efficiency are limited, and the ideal state of entering the furnace is difficult to achieve.
Disclosure of Invention
The invention provides an iron ore powder agglomeration method and an extrusion molding die, and aims to save energy consumption, reduce environmental pollution and improve the productivity of iron powder blocks.
The invention relates to an iron ore powder agglomeration method, which comprises the following steps:
(1) adding water into iron ore powder, limestone powder, cement and a pore-forming agent, and uniformly mixing to ensure that the mixture has certain plasticity;
(2) adding the plastic mixture into an extruder with the pressure of 4Mpa for vacuum treatment;
(3) and connecting the extrusion molding die with an outlet of an extruder, driving a piston or a screw of the extruder to extrude the plastic mixture from a die hole of the extrusion molding die to obtain a columnar iron powder block, wherein the die hole is a taper hole, and the area of a feed end is larger than that of a discharge end.
Further, the area ratio of the feeding end to the discharging end of the die hole is greater than 8: 1.
Further, the aperture of the discharge end of the die hole is determined according to smelting efficiency, and the number of the die holes is adjusted according to capacity requirements.
Further, the die holes are arranged in sequence inward along the extruder piston or extrusion screw edge.
The invention also provides an extrusion molding die for iron ore powder agglomeration, the extrusion molding die is matched with an extruder for use, a plurality of die holes are arranged on the extrusion molding die, the die holes are taper holes, and the area of a feeding end is larger than that of a discharging end.
Further, the area ratio of the feeding end to the discharging end of the die hole in the extrusion molding die is greater than 8: 1.
The invention has the beneficial effects that: the columnar powdered iron blocks are obtained by extruding the powdered iron blocks through an extruder with the extrusion pressure of more than 4Mpa, and the columnar powdered iron blocks are high in strength after being naturally dried, free of sintering, pollution-free, high in yield and ideal and consistent in furnace entering size. The extrusion ironmaking is to mix coke powder and the like together, and the sintering, smelting and melting are completed in an ironmaking blast furnace at one time, so that the energy is saved, the carbon emission is reduced, and the internal combustion type sintering is more environment-friendly and energy-saving due to the sintering in the closed hearth of the ironmaking blast furnace, and the dust emission is reduced. The die hole of the extrusion forming die is designed into a taper hole, so that after the material enters the taper hole of the die, the material reaches the maximum density under the action of centripetal component force of the conical surface.
Drawings
FIG. 1 is a schematic view of the screw extruder connection in the example of the present invention.
Fig. 2 is a schematic structural view of an extrusion molding die in an embodiment of the present invention.
FIG. 3 is a schematic view of the die orifice of the extrusion die of the present invention.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
As shown in fig. 1 to 3, the method for agglomerating iron ore powder according to the present embodiment includes:
(1) adding water into iron ore powder, limestone powder, cement and a pore-forming agent, and uniformly mixing to ensure that the mixture has certain plasticity;
(2) adding the plastic mixture into a feeding and vacuum processing chamber 2 of a screw extruder 1 which can reach 4Mpa for vacuum processing;
(3) the extrusion molding die 3 is connected with an outlet of the spiral extruder 1, the extruder is driven to spirally extrude the plastic mixture from a die hole 4 of the extrusion molding die 3 to obtain a columnar iron powder block, the die hole 4 is a taper hole, the area of a feeding end is larger than that of a discharging end, and the area ratio of the feeding end to the discharging end is larger than 8: 1. The aperture of the discharge end of the die hole 4 is determined according to smelting efficiency, and the number of the die holes 4 is adjusted according to capacity requirements.
In a specific implementation, the die holes 4 are arranged in sequence inwards along the piston or extrusion screw edge of the extruder.
The extrusion molding die for iron ore powder agglomeration is matched with an extruder for use, a plurality of die holes are formed in the extrusion molding die, the die holes are conical holes, the area of a feeding end is larger than that of a discharging end, and the ratio of the area of the feeding end to that of the discharging end is larger than 8: 1.
The columnar powdered iron blocks are obtained by extruding the powdered iron blocks through an extruder with the extrusion pressure of more than 4Mpa, and the columnar powdered iron blocks are high in strength after being naturally dried, free of sintering, pollution-free, high in yield and ideal and consistent in furnace entering size. The extrusion ironmaking is to mix coke powder and the like together, and the sintering, smelting and melting are completed in an ironmaking blast furnace at one time, so that the energy is saved, the carbon emission is reduced, and the internal combustion type sintering is more environment-friendly and energy-saving due to the sintering in the closed hearth of the ironmaking blast furnace, and the dust emission is reduced. The die hole of the extrusion forming die is designed into a taper hole, so that after the material enters the taper hole of the die, the material reaches the maximum density under the action of centripetal component force of the conical surface.
Many modifications and other embodiments of the invention will come to mind to one skilled in the art to which this invention pertains having the benefit of the teachings presented in the foregoing descriptions and the associated drawings. Therefore, it is to be understood that the inventions are not to be limited to the specific embodiments disclosed and that modifications and other embodiments are intended to be included within the scope of the appended claims. Although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (6)
1. A method for agglomerating iron ore powder is characterized by comprising the following steps:
(1) adding water into iron ore powder, limestone powder, cement and a pore-forming agent, and uniformly mixing to ensure that the mixture has certain plasticity;
(2) adding the plastic mixture into an extruder with the pressure of 4Mpa for vacuum treatment;
(3) and connecting the extrusion molding die with an outlet of an extruder, driving a piston or a screw of the extruder to extrude the plastic mixture from a die hole of the extrusion molding die to obtain a columnar iron powder block, wherein the die hole is a taper hole, and the area of a feed end is larger than that of a discharge end.
2. The iron ore powder agglomeration method according to claim 1, wherein: the area ratio of the feeding end to the discharging end of the die hole is greater than 8: 1.
3. The iron ore powder agglomeration method according to claim 1 or 2, wherein: the aperture of the discharge end of the die hole is determined according to smelting efficiency, and the number of the die holes is adjusted according to capacity requirements.
4. The iron ore powder agglomeration method according to claim 1, wherein: the die holes are arranged in sequence inward along the extruder piston or extrusion screw edge.
5. The utility model provides an iron ore powder is extrusion moulding mould for agglomeration which characterized in that: the extrusion molding die is matched with an extruder for use, a plurality of die holes are arranged on the extrusion molding die, the die holes are taper holes, and the area of a feed end is larger than that of a discharge end.
6. The extrusion molding die for iron ore powder agglomeration according to claim 5, wherein: the area ratio of the feeding end to the discharging end of the die hole in the extrusion molding die is greater than 8: 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110904826.0A CN113564353B (en) | 2021-08-07 | 2021-08-07 | Iron ore powder agglomeration method and extrusion molding die |
| PCT/CN2021/132018 WO2023015765A1 (en) | 2021-08-07 | 2021-11-22 | Iron ore powder briquetting method and an extrusion molding die |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110904826.0A CN113564353B (en) | 2021-08-07 | 2021-08-07 | Iron ore powder agglomeration method and extrusion molding die |
Publications (2)
| Publication Number | Publication Date |
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| CN113564353A true CN113564353A (en) | 2021-10-29 |
| CN113564353B CN113564353B (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110904826.0A Active CN113564353B (en) | 2021-08-07 | 2021-08-07 | Iron ore powder agglomeration method and extrusion molding die |
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| CN (1) | CN113564353B (en) |
| WO (1) | WO2023015765A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023015765A1 (en) * | 2021-08-07 | 2023-02-16 | 湘潭炜达机电制造有限公司 | Iron ore powder briquetting method and an extrusion molding die |
| WO2023087296A1 (en) * | 2021-11-17 | 2023-05-25 | 湘潭炜达机电制造有限公司 | Uniaxial vacuum intensive blast furnace hematite extruder |
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| GB2172586B (en) * | 1985-03-18 | 1988-09-28 | Cra Services | Metallurgical composites and processes |
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| CN1710112A (en) * | 2005-06-10 | 2005-12-21 | 孔凡逸 | Direct iron making method for punching particle material using low-grade superfine ironic material |
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| CN111763820B (en) * | 2020-06-04 | 2022-09-20 | 中国恩菲工程技术有限公司 | Slag modified reducing agent, preparation method thereof and method for recycling iron by using slag waste heat |
| CN113564353B (en) * | 2021-08-07 | 2023-03-03 | 湘潭炜达机电制造有限公司 | Iron ore powder agglomeration method and extrusion molding die |
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2021
- 2021-08-07 CN CN202110904826.0A patent/CN113564353B/en active Active
- 2021-11-22 WO PCT/CN2021/132018 patent/WO2023015765A1/en unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2005290525A (en) * | 2004-04-05 | 2005-10-20 | Nippon Steel Corp | Method for producing cold-agglomerated ore for blast furnace |
| CN101133169A (en) * | 2004-12-07 | 2008-02-27 | 纽-铁科技有限责任公司 | Method and system for producing metallic iron nuggets |
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| CN105331808A (en) * | 2015-11-26 | 2016-02-17 | 辽宁科技大学 | Method for iron ore powder agglomeration |
| CA3147711A1 (en) * | 2018-08-16 | 2020-02-20 | Binding Solutions Ltd | Binder formulation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023015765A1 (en) * | 2021-08-07 | 2023-02-16 | 湘潭炜达机电制造有限公司 | Iron ore powder briquetting method and an extrusion molding die |
| WO2023087296A1 (en) * | 2021-11-17 | 2023-05-25 | 湘潭炜达机电制造有限公司 | Uniaxial vacuum intensive blast furnace hematite extruder |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2023015765A1 (en) | 2023-02-16 |
| CN113564353B (en) | 2023-03-03 |
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