CN110629018B - Production method for improving sintering permeability of thick material layer - Google Patents
Production method for improving sintering permeability of thick material layer Download PDFInfo
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- CN110629018B CN110629018B CN201910944418.0A CN201910944418A CN110629018B CN 110629018 B CN110629018 B CN 110629018B CN 201910944418 A CN201910944418 A CN 201910944418A CN 110629018 B CN110629018 B CN 110629018B
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- 238000005245 sintering Methods 0.000 title claims abstract description 78
- 239000000463 material Substances 0.000 title claims abstract description 59
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 230000035699 permeability Effects 0.000 title claims abstract description 17
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000000843 powder Substances 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 6
- 238000009628 steelmaking Methods 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000002028 Biomass Substances 0.000 claims description 3
- 229910052918 calcium silicate Inorganic materials 0.000 claims description 3
- 239000000378 calcium silicate Substances 0.000 claims description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 claims description 3
- WETINTNJFLGREW-UHFFFAOYSA-N calcium;iron;tetrahydrate Chemical compound O.O.O.O.[Ca].[Fe].[Fe] WETINTNJFLGREW-UHFFFAOYSA-N 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 7
- 230000001603 reducing effect Effects 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 239000000428 dust Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002023 wood Substances 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- C22B1/16—Sintering; Agglomerating
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
-
- 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
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a production method for improving the sintering permeability of a thick material layer, wherein when the thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of a trolley before the material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.
Description
Technical Field
The invention belongs to the field of ferrous metallurgy, relates to a sintering production method, and particularly relates to a production method for improving the sintering permeability of a thick material layer.
Background
With the progress of domestic iron-making technology, the thick-layer sintering is gradually accepted by the steel industry as a production mode which can improve the production efficiency, reduce the fuel consumption and improve the quality of sintered ores. However, with the increase of the thickness of the material layer, the sintering combustion zone and the over-wet zone are thickened, the weight of the upper sintering mixture is increased, the lower sintering mixture is gradually compacted, the air permeability of the lower part of the whole material layer is sharply reduced, the yield and the quality of sintering ores are seriously influenced, and the further increase of the thickness of the sintering material layer is limited.
Therefore, the key to realize the sintering of thick material layers and even ultra-high material layers is to solve the problem that the permeability of the material layer under the sintering is poor, and CN200910078993.3 introduces a sinter layer load reducing device, a sintering machine using the device and a sintering method, which are mainly characterized in that the sinter layer load reducing device comprises: a strip-shaped base configured to be installed at the bottom of the sintering pallet in parallel to the traveling direction of the sintering pallet; and a plurality of right trapezoid off-loading plates detachably mounted to the base in a longitudinal direction (length direction) of the base, wherein adjacent right trapezoid off-loading plates are not adjacent with a right-angled edge, respectively. Through actual production inspection, by using the method, the sintering support beams and the single-tooth roller height of the head and the tail of the sintering machine, a bed charge leveling device of the head and the like must be greatly improved, and the improvement cost is high; in addition, the load reducing device in the method is easy to lose, the replacement of the device needs to be stopped, the labor amount for maintenance and updating is large, and the cost is high; and the load reducing device per se occupies the space of the sintering mixture on the sintering trolley, and the output of the sintering ore is greatly reduced per se. In addition, methods such as JP2-293586, JP4-168234, JP5-43950, JP6-129775, JP6-323745 and the like which use a trapezoidal or rectangular sintered material layer load reducing plate to reduce the load of a material layer and thus improve the air permeability of the material layer have the defects of poor load reducing effect, easy damage, inconvenient replacement, high cost and the like, and cannot completely solve the negative effects of the supporting device.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a production method for improving the sintering air permeability of a thick material layer, which utilizes available materials of a blast furnace, a supporting device for supporting an upper material layer is arranged at the lower part of the material layer, so that the influence of the gravity of the upper part of the material layer on the lower part of the material layer is reduced to the minimum, the bulk density of the lower material layer is reduced, the air permeability of the lower material layer is improved, meanwhile, the supporting device is carried out along with sintering and finally directly enters the blast furnace for production as sintered ores, and a series of problems that when the traditional supporting device is utilized in sintering, the sintering machine needs to be greatly produced and modified, the supporting device is abraded, the installation cost is increased, and the like are thoroughly solved. Not only greatly improves the production quality of the sintering ore, but also effectively reduces the sintering production cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production method for improving the sintering permeability of a thick material layer is characterized by comprising the following steps: when thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of the trolley before material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.
The support is of a trapezoidal table structure.
The connecting rod can be made of the same material as the bracket or made of a biomass material.
After the supporting device is sintered at high temperature, the components of the supporting device are 20-30 percent of iron content by mass percent, 1.9-3.0 times of binary alkalinity and 2.0-2.6 times of quaternary alkalinity, and the supporting device is made of calcium ferrite and calcium silicate minerals which can be directly connected into a blast furnace.
The thick material layer is more than 700mm in thickness.
The fine iron oxide powder has a particle size of less than 50 meshes and accounts for more than 80% of the mass percent.
The invention has the beneficial effects that: the invention can thoroughly solve the problems that the speed of a sintering machine is slowed down and the quality of sintered mineral products is obviously reduced after the thickness of a sintered material layer reaches a certain degree. The supporting device is arranged at the lower part of the thick material layer, so that the gravity extrusion problem of the mixture at the lower part by the upper part can be effectively reduced, and the problem that the air permeability of the lower part of the material layer is poor and the thickness of the material layer is restricted to be improved is thoroughly solved. The supporting device is composed of a plurality of independent supports and is connected by biomass fuel, so that the supporting device can be stably placed on the trolley without being fixed on the trolley, the reconstruction cost of sintering is greatly saved, and no influence is caused on continuous sintering production. The unique material composition of the supporting device not only can not cause the phenomena of collapse, fracture and the like, but also can become a high-alkalinity blast furnace available material containing calcium ferrite and calcium silicate through the further high-temperature action of sintering. And the supporting device is completely bonded with the sintering ore at the tail of the sintering machine and enters a crushing, cooling and screening device to become a part of finished ore, thereby thoroughly solving the defect of a fixed support. Therefore, the production quality of the sintered ore is greatly improved, the production cost of sintering transformation, maintenance and the like is effectively reduced, and the method has extremely high popularization and application values and can be an effective measure for improving the thickness of the sintered material layer in the future.
Drawings
FIG. 1 is a schematic view of a supporting apparatus according to embodiment 1 of the present invention;
FIG. 2 is a side view of FIG. 1;
FIG. 3 is a schematic view of a supporting device according to embodiment 2 of the present invention;
wherein, 1 is a bracket, and 2 is a connecting rod.
Detailed Description
The following description is given with reference to specific examples:
example 1:
when a 260 square meter sintering machine is used for production, the height of the trolley baffle is 750mm, the concentrate is more than 70%, the height of the supporting device is 260mm, the supporting device is composed of 2 independent supports, the supports are made of 25% return ores, 25% steelmaking converter slag, 10% sintering dust, 10% iron oxide powder and 30% cement, the width between the two supports is 1100mm, and the length of each support is 500 mm. Before sintering and distributing, 1 group of supporting devices fall into the middle of a sintering trolley, the supporting devices are connected by materials mainly made of wood materials, after distributing, the supporting devices play a role of supporting an upper material layer at the lower part of the material layer, after the whole sintering process, at the tail of a sintering machine, the supporting devices and sintering ore are crushed by a single-tooth roller, then enter a ring cooling machine for cooling, and then enter a blast furnace after being screened by finished ore.
Example 2:
when a 405 square meter sintering machine is produced, the height of the trolley baffle is 900mm, the height of the supporting device is 450mm, the supporting device is composed of 3 independent supports, the supports are made of 20% return ores, 20% steelmaking converter slag, 5% sintering dust, 10% iron oxide powder and 45% cement, the width between the two supports is 1200mm, and the length of each support is 400 mm. Before sintering and distributing, 2 groups of supporting devices fall into the middle of a sintering trolley, the supporting devices are connected by materials mainly made of wood materials, after distributing, the supporting devices play a role of supporting an upper material layer at the lower part of the material layer, after the whole sintering process, at the tail of a sintering machine, the supporting devices and sintering ore are crushed by a single-tooth roller, then enter a ring cooling machine for cooling, and then enter a blast furnace after being screened by finished ore.
Example 3:
when a 600 square meter sintering machine is produced, the height of the trolley baffle is 1200mm, the height of the supporting device is 650mm, the supporting device is composed of 4 independent supports, the supports are made of 20% return ores, 15% steelmaking converter slag, 5% sintering dust, 5% iron oxide powder and 55% cement, the width between the two supports is 1000mm, and the length of each support is 600 mm. Before sintering and distributing, 3 groups of supporting devices fall into the middle of a sintering trolley, the supporting devices are connected by materials mainly made of wood materials, after distributing, the supporting devices play a role of supporting an upper material layer at the lower part of the material layer, after the whole sintering process, at the tail of a sintering machine, the supporting devices and sintering ore are crushed by a single-tooth roller, then enter a ring cooling machine for cooling, and then enter a blast furnace after being screened by finished ore.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (6)
1. A production method for improving the sintering permeability of a thick material layer is characterized by comprising the following steps: when thick material layer sintering production is carried out, at least 1 group of supporting devices are vertically arranged with the moving direction of the trolley before material distribution of a sintering machine, and the height of each supporting device is 1/3-4/5 of the height of a trolley baffle; the supporting device is more than 2 brackets which are connected by a plurality of connecting rods; the bracket comprises, by mass, 10-25% of sintered or blast furnace return ores, 15-25% of steelmaking converter slag, 5-10% of sintered dedusting ash, 5-10% of fine iron oxide powder and 30-55% of cement; the support keeps the original shape along with the sintering, and the support and the sintering ore are crushed together at the tail of the sintering machine and then are cooled and screened.
2. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the support is of a trapezoidal table structure.
3. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the connecting rod can be made of the same material as the bracket or made of a biomass material.
4. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: after the supporting device is sintered at high temperature, the components of the supporting device are 20-30 percent of iron content by mass percent, 1.9-3.0 times of binary alkalinity and 2.0-2.6 times of quaternary alkalinity, and the supporting device is made of calcium ferrite and calcium silicate minerals which can be directly connected into a blast furnace.
5. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the thick material layer is more than 700mm in thickness.
6. The production method for improving the sintering air permeability of the thick material layer according to claim 1, characterized in that: the fine iron oxide powder has a particle size of less than 50 meshes and accounts for more than 80% of the mass percent.
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| CN201910944418.0A CN110629018B (en) | 2019-09-30 | 2019-09-30 | Production method for improving sintering permeability of thick material layer |
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| CN201910944418.0A CN110629018B (en) | 2019-09-30 | 2019-09-30 | Production method for improving sintering permeability of thick material layer |
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| CN110629018B true CN110629018B (en) | 2021-05-28 |
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| CN111928645B (en) * | 2020-08-04 | 2022-08-23 | 西安建筑科技大学 | Sintering machine and method for improving air permeability of sintering material layer |
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