CN113930610A - Method for reducing hot pulverization of sintering mixture - Google Patents
Method for reducing hot pulverization of sintering mixture Download PDFInfo
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- CN113930610A CN113930610A CN202111215999.8A CN202111215999A CN113930610A CN 113930610 A CN113930610 A CN 113930610A CN 202111215999 A CN202111215999 A CN 202111215999A CN 113930610 A CN113930610 A CN 113930610A
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- sintering
- secondary resource
- uniformly
- mixture
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- 238000005245 sintering Methods 0.000 title claims abstract description 53
- 239000000203 mixture Substances 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000010298 pulverizing process Methods 0.000 title claims abstract description 15
- 239000000463 material Substances 0.000 claims abstract description 36
- 238000002156 mixing Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 230000008569 process Effects 0.000 claims abstract description 10
- 239000000428 dust Substances 0.000 claims description 5
- 239000004744 fabric Substances 0.000 claims description 3
- 238000010410 dusting Methods 0.000 claims 4
- 238000007670 refining Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 239000008188 pellet Substances 0.000 abstract description 8
- 230000035699 permeability Effects 0.000 abstract description 8
- 239000002245 particle Substances 0.000 abstract description 7
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 3
- 239000002956 ash Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 4
- 238000005469 granulation Methods 0.000 description 4
- 230000003179 granulation Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000007771 core particle Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000004537 pulping Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 238000009736 wetting Methods 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
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- 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 method for reducing heat pulverization of a sintering mixture in the field of iron ore sintering, which mainly comprises the steps of mixing and stirring a secondary resource and water uniformly in the material mixing process before sintering, prewetting the secondary resource, premixing the prewetted secondary resource and return ores uniformly to enable the prewetted secondary resource and the return ores to be adhered to the surfaces of the return ores uniformly, and finally mixing the premixed uniform material and other sintering materials uniformly. Compared with the existing direct mixing, the method has the advantages that the fine-grain secondary material with poor granulating performance and hydrophilic performance is pre-wetted, the hydrophilic performance is improved, the negative influence of the fine-grain secondary material on the granulating performance of the mixture is reduced, the fine-grain secondary material is adhered to the surface of the return ore of the nuclear particles in advance and is positioned in the center of a sintered mixture pellet, and the problems that a large amount of secondary resources are adhered to the surface of the mixture pellet, so that capillary water on the surface of the pellet is insufficient, the adhesion of particles on the surface of the pellet is insufficient, and the thermal pulverization resistance performance is poor are solved, so that the air permeability of a sinter bed is improved, and the economic index of the sintering technology is improved.
Description
Technical Field
The invention relates to the field of iron ore sintering, in particular to a method for reducing hot pulverization of a sintering mixture.
Background
The iron ore sintering process is a process of uniformly mixing an iron-containing material, a fuel and a flux, adding water for granulation and igniting for sintering, and in an iron and steel enterprise, the sintering process can not only provide sintered ores with proper granularity and certain strength for blast furnace production, but also digest secondary resources containing higher valuable elements. In the sintering burden, some secondary resources containing higher valuable elements are often added, mainly resources such as dust removal ash generated in sintering and blast furnace processes. However, these resources generally have a fine particle size and a poor hydrophilicity, and after the resources are added into a sintering process, the particle size composition, the heat pulverization resistance and the like of the sintering mixture are adversely affected, so that the air permeability of the sinter bed is reduced, and finally the economic indexes of the sintering technology are deteriorated.
Disclosure of Invention
In order to overcome the defects that secondary resources in the existing sintering powder are easy to cause sintering mixture hot pulverization, air permeability reduction and the like, the invention aims to solve the technical problems that: a method for reducing thermal degradation of a sinter mix is provided.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method for reducing the thermal pulverization of a sintering mixture is characterized in that in the material mixing process before sintering, a secondary resource is mixed with water and stirred uniformly, the secondary resource is pre-wetted, then the pre-wetted secondary resource and return ores are pre-mixed uniformly to be adhered to the surfaces of the return ores uniformly, and finally the pre-mixed uniform material is mixed with other sintering materials uniformly.
Further, the secondary resource is gas ash, dust removal ash or cloth bag ash.
Further, the adding amount of the secondary resource is 0-6% of the total weight of the new sintering material.
Further, the mass ratio of the secondary resource to water is 6-8: 2-4.
Further, the mass ratio of the secondary resource to water is 7: 3, and mixing.
The invention has the beneficial effects that: by prewetting the fine-grained secondary material with poor granulating performance and hydrophilic performance, the hydrophilic performance of the fine-grained secondary material is improved, and the negative influence of the fine-grained secondary material on the granulating performance of the mixture is reduced; the core particles are adhered to the surface of the return ores of the core particles in advance and are positioned in the center of the small balls of the sintering mixture, so that the problems of insufficient capillary water on the surfaces of the small balls, insufficient adhesion of the particles on the surfaces of the small balls and poor heat pulverization resistance caused by adhesion of a large amount of secondary resources to the surfaces of the small balls of the mixture are solved, the air permeability of a sinter bed is improved, and the economic index of the sintering technology is improved.
Detailed Description
The present invention will be further described with reference to the following examples.
The method for reducing the hot pulverization of the sintering mixture is mainly characterized in that in the material mixing process before sintering, the secondary resource and water are mixed and stirred uniformly, the secondary resource is pre-wetted, the pre-wetted secondary resource and return ores are pre-mixed uniformly to be adhered to the surfaces of the return ores uniformly, and finally, the pre-mixed uniform material and other sintering materials are mixed uniformly. Compared with the existing direct mixing, the method has the advantages that the fine-grain secondary material with poor granulating performance and hydrophilic performance is pre-wetted, the hydrophilic performance is improved, the negative influence of the fine-grain secondary material on the granulating performance of the mixture is reduced, the fine-grain secondary material is adhered to the surface of the return ore of the nuclear particles in advance and is positioned in the center of a sintered mixture pellet, and the problems that a large amount of secondary resources are adhered to the surface of the mixture pellet, so that capillary water on the surface of the pellet is insufficient, the adhesion of particles on the surface of the pellet is insufficient, and the thermal pulverization resistance performance is poor are solved, so that the air permeability of a sinter bed is improved, and the economic index of the sintering technology is improved.
The secondary resource generally adopts solid powdery resources with secondary utilization value, such as gas ash, dust removal ash or cloth bag ash. The secondary resources are common in the ferrous metallurgy industry, have sufficient yield and contain more valuable elements. In order to avoid the influence of excessive addition of secondary resources on the sintering index, the addition amount is preferably 0-6% of the total weight of sintering fresh material, which refers to the weight of the sintering material after removing return ores. Wherein, the preferable scheme is that the secondary resource is a mixture of gas ash and dust removal ash, and the mass of the mixture is respectively 4% and 2% of the total weight of the new sintering material.
When the secondary resource is prewetted, in order to ensure the wetting effect, the secondary resource can be stably adhered to the surface of the return mine and can not bring excessive moisture, and the mass ratio of the secondary resource to water is 6-8: 2-4. Wherein, the preferable scheme is that the mass ratio of the secondary resource to water is 7: 3, and mixing.
The invention is further illustrated by the following specific examples.
The first embodiment is as follows:
weighing gas ash and fly ash with the mass of 4% and 2% of the total weight of the new sintering material respectively, directly feeding the first part into a mixer to mix with other materials and then sintering, and taking the scheme as a comparative example 1; the second part is prepared by mixing the secondary resource and water in a ratio of 7: 3, uniformly mixing and stirring to fully wet the secondary resource and form slurry, adding the slurry into a mixer to be uniformly mixed with other sintering materials, and taking the scheme as a comparative example 2; and thirdly, mixing the secondary resource with water in a ratio of 7: 3 to fully wet the secondary resource and form slurry, adding the wetted secondary resource and the return ore into a stirrer together to stir, fully pre-mixing the secondary resource slurry and the return ore, uniformly adhering the secondary resource to the surface of the return ore, adding the pre-mixed material and other sintering materials into a mixer together to mix uniformly, and taking the scheme as an embodiment.
Sintering experiments are respectively carried out on the three schemes, the moisture of a mixed material is controlled within the range of 7.5% +/-0.2%, the first mixing time is 4min, the second mixing time is 4min, the sintering new material amount is 70kg, the material layer is 700mm, 30% of return ores are externally prepared, the return ores are specially fired, the same granularity component of the return ores is ensured, 2.5kg of bottom material is paved, the sintering ignition time is 2min, the ignition temperature is 1050 +/-50 ℃, and the sintering ore blending scheme is specifically as follows:
sintering batching structure
Sintering experiments are carried out by the burdening scheme and the experimental method, and the wet screening, dry screening and sintering technical economic indexes of the mixture are counted as follows:
particle size/% of the mixture
The scheme of uniformly mixing the secondary resource gas ash and the fly ash after pulping with the return mine can prewet the secondary resource with smooth surface and poor granulation performance to increase the capillary water content of the secondary resource and improve the granulation performance, the secondary resource gas ash and the fly ash with poor adhesion performance can be positioned in a mixture ball after being uniformly coated on the surface of the return mine in advance, and the secondary resource gas ash and the fly ash with poor adhesion performance are positioned in the ball after the mixture ball is preheated in the sintering process, so that the thermal shock resistance of the mixture is improved, the preheating pulverization quantity of the mixture is reduced, and the improvement of the bed permeability is facilitated. From the results in the table, compared with comparative example 1 and comparative example 2, by implementing the method, the grain fraction proportion of the wet sieve with the grain size larger than 3mm of the sintering mixture is respectively increased by 4.4% and 4.1%, and the grain fraction proportion of the dry sieve with the grain size larger than 3mm of the sintering mixture is respectively increased by 3.67% and 2.87%, so that the granulation effect of the sintering mixture is obviously improved, and meanwhile, the air permeability of a sinter layer can be obviously improved.
Economic index/% of sintering technique
| Name (R) | Using coefficient/t/(m)2·h) | Tumbler index/% | Percent of yield% |
| Comparative example 1 | 1.18 | 52.33 | 74.32 |
| Comparative example 2 | 1.19 | 53.27 | 75.23 |
| Examples | 1.25 | 56.59 | 78.83 |
As can be seen from the table, after the application of the method, the utilization coefficient of the sinter, the drum index of the sinter and the yield are obviously improved.
The metallurgical properties of the sintered ore were compared as follows:
sinter drip performance
Medium-temp. reduction and low-temp. pulverization performance of sintered ore
As can be seen from the above table, after the application of the method, the sintered ore molten drop performance, the low-temperature pulverization performance and the medium-temperature reduction performance are all obviously improved, and the method is favorable for improving the air permeability of the blast furnace.
Claims (5)
1. The method for reducing the thermal pulverization of the sintering mixture is characterized by comprising the following steps: in the material mixing process before sintering, the secondary resource is firstly mixed and stirred uniformly with water, the secondary resource is prewetted, then the prewetted secondary resource and the return mine are premixed uniformly to be uniformly adhered to the surface of the return mine, and finally the premixed refining material is uniformly mixed with other sintering materials.
2. The method of reducing hot dusting of sinter mix as claimed in claim 1, wherein: the secondary resource is gas ash, dust removal ash or cloth bag ash.
3. The method of reducing hot dusting of sinter mix as claimed in claim 1, wherein: the addition amount of the secondary resource is 0-6% of the total weight of the new sintering material.
4. The method of reducing hot dusting of sinter mix as claimed in claim 1, wherein: the mass ratio of the secondary resource to water is 6-8: 2-4.
5. The method of reducing hot dusting of sinter mix as claimed in claim 4, wherein: the mass ratio of the secondary resource to water is 7: 3, and mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111215999.8A CN113930610A (en) | 2021-10-19 | 2021-10-19 | Method for reducing hot pulverization of sintering mixture |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111215999.8A CN113930610A (en) | 2021-10-19 | 2021-10-19 | Method for reducing hot pulverization of sintering mixture |
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| Publication Number | Publication Date |
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| CN113930610A true CN113930610A (en) | 2022-01-14 |
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| CN202111215999.8A Pending CN113930610A (en) | 2021-10-19 | 2021-10-19 | Method for reducing hot pulverization of sintering mixture |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649390A (en) * | 2009-09-15 | 2010-02-17 | 山西太钢不锈钢股份有限公司 | Method for ultra-fine refined flour sintering for large-scale sintering machine |
| CN104975169A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method of improving breathability of sintering mixture |
| CN111733320A (en) * | 2020-07-29 | 2020-10-02 | 攀钢集团研究院有限公司 | Granulation method for improving particle size of sintering mixture |
| CN113502390A (en) * | 2021-07-09 | 2021-10-15 | 攀钢集团西昌钢钒有限公司 | Method for improving granulation effect of sintering mixture |
-
2021
- 2021-10-19 CN CN202111215999.8A patent/CN113930610A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101649390A (en) * | 2009-09-15 | 2010-02-17 | 山西太钢不锈钢股份有限公司 | Method for ultra-fine refined flour sintering for large-scale sintering machine |
| CN104975169A (en) * | 2014-04-10 | 2015-10-14 | 鞍钢股份有限公司 | Method of improving breathability of sintering mixture |
| CN111733320A (en) * | 2020-07-29 | 2020-10-02 | 攀钢集团研究院有限公司 | Granulation method for improving particle size of sintering mixture |
| CN113502390A (en) * | 2021-07-09 | 2021-10-15 | 攀钢集团西昌钢钒有限公司 | Method for improving granulation effect of sintering mixture |
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Application publication date: 20220114 |
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