CN114250358A - Super-thick material layer sintering process - Google Patents
Super-thick material layer sintering process Download PDFInfo
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- CN114250358A CN114250358A CN202111511491.2A CN202111511491A CN114250358A CN 114250358 A CN114250358 A CN 114250358A CN 202111511491 A CN202111511491 A CN 202111511491A CN 114250358 A CN114250358 A CN 114250358A
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- layer material
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- fuel
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- sintering process
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- 239000000463 material Substances 0.000 title claims abstract description 110
- 238000005245 sintering Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000446 fuel Substances 0.000 claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 230000004907 flux Effects 0.000 claims abstract description 10
- 229910052742 iron Inorganic materials 0.000 claims abstract description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 230000000694 effects Effects 0.000 claims description 11
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 239000008236 heating water Substances 0.000 claims description 6
- 239000008188 pellet Substances 0.000 claims description 6
- 238000004939 coking Methods 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000003723 Smelting Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a sintering process of an ultra-thick material layer, belonging to the technical field of iron ore smelting. The method comprises the following steps: dividing the uniformly mixed ore into an upper layer material and a lower layer material according to the mass ratio of 1 (0.6-1.5); respectively adding a flux and fuel into an upper layer material and a lower layer material, and then performing primary mixing and secondary mixing, wherein the mass of the fuel in the upper layer material is not less than that of the fuel in the lower layer material; and respectively feeding the upper layer material and the lower layer material which are subjected to secondary mixing into two upper material bins, wherein the lower layer material is arranged in front, and the upper layer material is subjected to material distribution, ignition and sintering. According to the invention, through the processes of adding fuel at the upper layer and the lower layer, mixing the fuel in a grading manner and distributing the fuel at the upper layer and the lower layer, the sintering of the super-thick material layer of 1-1.5 m is realized, the yield can be improved, the fuel consumption is reduced, and the quality is stabilized.
Description
Technical Field
The invention belongs to the technical field of iron ore smelting, and particularly relates to a sintering process for an ultra-thick material layer.
Background
At present, the material layer of the large-scale sintering machine in China is basically maintained at 800-1000mm, and is difficult to break through 1000 mm. The main reasons are that the grain size of the mixed ore under the existing ore structure is finer, the air permeability is poor after the height of a material layer breaks through 1000mm, and the yield is influenced; secondly, regarding the traditional blending, granulating and distributing process, the moisture of the mixture is generally high, and after the thickness of the material layer is increased, the phenomenon that the over-wet belt is widened easily occurs, so that the air permeability of the lower part and the thickness of the red fire layer of the material layer are influenced, and the sintering quality is influenced.
Along with the continuous increase of the steel productivity, high-quality iron ore is less and less, the structure of ore for sintering tends to be deteriorated, the using amount of fine grinding concentrate powder is increased, and in order to obtain high-yield and high-quality sintered ore and meet the production requirement, the production method is realized only by changing the traditional sintering process and improving the processes of uniformly mixing, granulating and distributing; meanwhile, with the requirement of carbon emission reduction, low-energy-consumption sintering is realized on the premise of quality and yield conservation, and the traditional sintering process also needs to be innovated.
Relevant research practices show that: the thick material layer has obvious effects on reducing fuel consumption and improving yield due to the self-heat storage effect and large material distribution amount, the yield can be improved by 10-15% when the material layer is improved by 100mm, and the fuel consumption can be reduced by 2-5 kg/t. However, when a thick material layer is sintered, the problems of poor material layer air permeability, widened over-wet zone, influence on sintering yield and quality and aggravation of quality difference of the upper part and the lower part of a sintering material layer are easily caused.
Disclosure of Invention
The technical problem to be solved is as follows: aiming at the technical problems, the invention provides an ultra-thick material layer sintering process which can improve the yield, reduce the fuel consumption and stabilize the quality.
The technical scheme is as follows: a super-thick material layer sintering process comprises the following steps:
s1, dividing the uniformly mixed ore into an upper layer material and a lower layer material according to the mass ratio of 1 (0.6-1.5);
s2, mixing the upper layer material and the lower layer material with flux and fuel respectively, and then performing primary mixing and secondary mixing, wherein the mass of the fuel in the upper layer material is not less than that of the fuel in the lower layer material;
s3, respectively feeding the two mixed upper layer material and the lower layer material into two upper material bins, pressing the lower layer material in front, and distributing the upper layer material after ignition and sintering.
Preferably, the thickness of the super-thick material layer is 1-1.5 m.
Preferably, the mass ratio of the fuel in the upper-layer material to the lower-layer material is (1-2): 1.
preferably, in the step S3, after the lower layer material is sent to the feeding bin, preheating and drying are performed first, and then material distribution is performed.
Preferably, iron-containing pellets with the diameter of 3-5mm are added into the two-mixed lower-layer material.
Preferably, the raw material containing the iron pellets comprises fine iron powder and coking dust.
Preferably, the addition amount of the quicklime in the flux is more than 4%, and the activity of the quicklime is more than 250.
Preferably, the temperature of the primary mixed heating water is more than or equal to 60 ℃, and the temperature of the secondary mixed heating water is more than or equal to 60 ℃.
Has the advantages that: in the process of realizing the sintering of the ultra-thick material layer, the uniform mixing ore is divided into the upper layer material and the lower layer material, and fuel is added into the upper layer material, so that the heat in the upper layer material is increased, the uniformity of each component of the upper layer material and the lower layer material is ensured due to the heat storage effect of the lower layer material, and the quality of the sintering ore is stabilized; 3-5mm small balls made of coking dedusting ash and iron-containing waste materials are added into the lower layer material, so that the air permeability of the lower layer material is improved, the sintering speed is accelerated, and the sintering yield is improved; the lower-layer material is preheated and dried in the upper material bin by utilizing high-temperature flue gas circulation, so that the width of a lower over-wet zone is favorably reduced, the heat utilization rate of the lower part is improved, and the quality of sintered ore is improved; the proportion of the quicklime in the flux is improved, the activity of the quicklime is improved, the granulation effect of the mixture is favorably improved, the air permeability of the whole super-thick material layer is improved, and the sintering yield is improved.
Detailed Description
Technical solutions in the embodiments of the present invention will be described in detail below, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
A super-thick material layer sintering process is provided, wherein the thickness of a material layer is 1-1.5 m, and the process comprises the following steps:
s1, two sets of first mixing and second mixing and distributing devices for sintering are arranged, and the mixed ore is divided into an upper layer material and a lower layer material according to the mass ratio of 1 (0.6-1.5);
s2, respectively adding flux and fuel into the upper layer material and the lower layer material, and respectively performing primary mixing and secondary mixing through two sets of sintering devices, wherein the mass of the fuel in the upper layer material is not less than that of the fuel in the lower layer material, and the mass ratio is (1-2): 1; the addition amount of the quicklime in the flux is more than 4 percent, and the activity of the quicklime is more than 250; the temperature of the primary mixed heating water and the temperature of the secondary mixed heating water are both more than or equal to 60 ℃;
s3, adding iron-containing pellets with the diameter of 3-5mm, which are prepared from fine iron powder, sludge, coking dust and the like, into the two-mixed lower-layer material, respectively feeding the lower-layer material and the upper-layer material into a front upper bin and a rear upper bin, and distributing and igniting the upper-layer material and then sintering the upper-layer material according to the condition that the lower-layer material is in front and the upper-layer material is in rear; wherein, before the lower layer material is distributed to the sintering trolley, high-temperature circulating flue gas is introduced into a lower material bin where the lower layer material is positioned, and the lower layer material is preheated and dried.
The above protocol will be implemented from a sinter pot experimental set-up.
(1) Upper and lower layer cloth of mixed material and other parameters
(2) Sintering and finished ore treatment
And after uniformly mixing, granulating and distributing and sintering according to experimental requirements, crushing, dropping, screening and calculating and analyzing sintering indexes of sintered ores.
(3) And (5) experimental results.
The sintering index is as follows:
according to sintering indexes, the thickness of the material layer is increased from 1000mm to 1200mm, and because the upper layer and the lower layer of double-layer cloth are adopted, fuel is added in the upper layer of material, the sintering effect of the upper layer of material is improved, and the quality of sintered ore of the upper layer of material is improved; the pellets containing iron waste such as coking dust removal ash and fine iron powder are added into the lower layer material, so that the air permeability of the lower layer material is increased, and the sintering yield is favorably improved; the lower material layer is preheated and dried, so that the width of an over-wet belt in the lower material layer is favorably reduced, the temperature of a sintered material is improved, and the quality is favorably improved; the proportion of flux quicklime is improved, the activity of the flux quicklime is improved, the granulation effect of the whole mixture is improved, the material temperature is increased, and the yield and quality are improved. After the height of the material layer is increased from 1000mm to 1200mm, the utilization coefficient is averagely increased by 10.31%, the yield is averagely increased by 0.13%, the drum index is averagely increased by 0.90%, and the solid fuel consumption is reduced by 3.83 kg/t.
The invention improves the height of the sinter bed, improves the air permeability of the sinter bed through the improvement and the promotion of equipment and process, increases the temperature of the mixture, improves various sintering indexes, and particularly greatly improves the yield.
Claims (8)
1. The super-thick material layer sintering process is characterized by comprising the following steps of:
s1, dividing the uniformly mixed ore into an upper layer material and a lower layer material according to the mass ratio of 1 (0.6-1.5);
s2, mixing the upper layer material and the lower layer material with flux and fuel respectively, and then performing primary mixing and secondary mixing, wherein the mass of the fuel in the upper layer material is not less than that of the fuel in the lower layer material;
s3, respectively feeding the two mixed upper layer material and the lower layer material into two upper material bins, pressing the lower layer material in front, and distributing the upper layer material after ignition and sintering.
2. The super-thick material layer sintering process according to claim 1, wherein the thickness of the super-thick material layer is 1-1.5 m.
3. The sintering process of the super-thick material layer according to claim 1, wherein the mass ratio of the fuel in the upper material layer and the lower material layer is (1-2): 1.
4. the sintering process of claim 1, wherein in step S3, the lower layer is fed into the feeding bin, and then is preheated and dried, and then is distributed.
5. The sintering process of the super-thick material layer according to claim 1, wherein iron-containing pellets with the diameter of 3-5mm are added into the two mixed lower material layers.
6. The super thick bed sintering process of claim 5, wherein said iron-containing pellet comprises fine iron powder and coking fly ash.
7. The sintering process of the super thick material layer according to claim 1, wherein the addition amount of the quicklime in the flux is more than 4%, and the activity of the quicklime is more than 250.
8. The sintering process of claim 1, wherein the temperature of the first mixed heating water is not less than 60 ℃ and the temperature of the second mixed heating water is not less than 60 ℃.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111511491.2A CN114250358A (en) | 2021-12-06 | 2021-12-06 | Super-thick material layer sintering process |
| PCT/CN2022/119351 WO2023103513A1 (en) | 2021-12-06 | 2022-09-16 | Ultra-thick material layer sintering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111511491.2A CN114250358A (en) | 2021-12-06 | 2021-12-06 | Super-thick material layer sintering process |
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| Publication Number | Publication Date |
|---|---|
| CN114250358A true CN114250358A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111511491.2A Pending CN114250358A (en) | 2021-12-06 | 2021-12-06 | Super-thick material layer sintering process |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN114250358A (en) |
| WO (1) | WO2023103513A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115058589A (en) * | 2022-05-31 | 2022-09-16 | 天津钢铁集团有限公司 | Sintered ore production method for achieving material distribution thickness of sintering machine to be 950-1000mm |
| CN115305348A (en) * | 2022-07-25 | 2022-11-08 | 武汉钢铁有限公司 | Method for improving structural distribution uniformity of sintered ore bed of super-thick material bed |
| WO2023103513A1 (en) * | 2021-12-06 | 2023-06-15 | 江苏沙钢集团有限公司 | Ultra-thick material layer sintering process |
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- 2021-12-06 CN CN202111511491.2A patent/CN114250358A/en active Pending
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2022
- 2022-09-16 WO PCT/CN2022/119351 patent/WO2023103513A1/en unknown
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023103513A1 (en) * | 2021-12-06 | 2023-06-15 | 江苏沙钢集团有限公司 | Ultra-thick material layer sintering process |
| CN115058589A (en) * | 2022-05-31 | 2022-09-16 | 天津钢铁集团有限公司 | Sintered ore production method for achieving material distribution thickness of sintering machine to be 950-1000mm |
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| Publication number | Publication date |
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| WO2023103513A1 (en) | 2023-06-15 |
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