CN110592371A - Sintering process for using large-particle extra-fine powder as sintering bedding material - Google Patents
Sintering process for using large-particle extra-fine powder as sintering bedding material Download PDFInfo
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- CN110592371A CN110592371A CN201910948133.4A CN201910948133A CN110592371A CN 110592371 A CN110592371 A CN 110592371A CN 201910948133 A CN201910948133 A CN 201910948133A CN 110592371 A CN110592371 A CN 110592371A
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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
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
Abstract
The invention relates to a sintering process for using large-particle super-fine powder as a sintering bedding material, belonging to the field of sintering pellets, and the sintering process for using the large-particle super-fine powder as the sintering bedding material comprises the following steps: before the mixture is paved in the sintering machine, paving the extra-special powder bedding material in the sintering machine, wherein the granularity of the extra-special powder is more than or equal to 10mm, the sintering process using the large-particle extra-special powder provided by the embodiment of the invention as the sintering bedding material improves the sintering yield by about 3-4%, and the utilization coefficient by 0.15t/m2H, the barrate index is improved by about 1 percent, and the solid fuel consumption is reduced by 4 kg/t.
Description
Technical Field
The invention belongs to the field of sintered pellets, and particularly relates to a sintering process for using large-particle extra-fine powder as a sintering bedding material.
Background
In the sintering production, a layer of furnace charge without fuel, namely a bottom material, is paved between the sintering mixture and the grate bar. The sintering and bottom paving material is obtained by sieving the sintering finished ore for a plurality of times to obtain 8-15mm or 10-20mm of ore with smaller granularity, which is the sintering ore between the return fine and the finished ore. Because the sintering bedding materials are obtained by sieving sintering finished ore, the yield of the sintering finished ore is reduced, the energy consumption is increased, and the production cost is increased. Therefore, there is a need in the art for an alternative to sintering bedding materials.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a sintering process for large particle super fine powder used as a sintering bed charge, which overcomes or at least partially solves the above problems.
The embodiment of the invention provides a sintering process for using large-particle extra-fine powder as a sintering bedding material, which comprises the following steps:
before the mixture is paved in the sintering machine, paving a super-special powder paving base material in the sintering machine, wherein the granularity of the super-special powder is more than or equal to 10 mm.
Further, the mixture comprises the following components in percentage by weight: 56-60% of mixed powder, 25-30% of return fines, 3.6-4% of coal powder, 4-4.5% of limestone, 4-4.5% of dolomite and 3-3.6% of granulated ash.
Further, the mixture comprises the following components in percentage by weight: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
Further, the blending powder comprises the following components in percentage by weight: 20-23% of Calamine, 8-10% of Amylum Arabic powder, 40-46% of Yangdai powder, 3-5% of SiC concentrate, 4-8% of superfine powder, 3-5% of Rake powder, 1-2% of iron dust mud, 3-5% of Niuqian powder and 2-5% of plum extract.
Further, the blending powder comprises the following components in percentage by weight: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
Further, the granularity of the coal powder is 0.5-3 mm.
Further, the particle size of the limestone is 0-3 mm.
Further, the dolomite particle size is 0-3 mm.
Further, the particle ash size is 0-3 mm.
Further, the thickness of the super-special powder bedding material paved in the sintering machine is 30-40 mm.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
by adopting the sintering process of using the large-particle super-fine powder provided by the embodiment of the invention as the sintering bedding material, the sintering bedding material is completely replaced by the large-particle super-fine powder, the sintering yield is improved by about 3-4%, and the utilization coefficient is improved by 0.15t/m2H, the barrate index is improved by about 1 percent, and the solid fuel consumption is reduced by 4 kg/t.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available.
The embodiment provides a sintering process for using large-particle super-fine powder as a sintering bedding material, which comprises the following steps:
before the mixture is paved in the sintering machine, paving a super-special powder paving base material in the sintering machine, wherein the granularity of the super-special powder is more than or equal to 10 mm.
By adopting the technical scheme, the super-special powder large particles with the particle size of more than or equal to 10mm are paved on a sintering machine to be used as a bedding material, all the super-special powder large particles are accumulated, the thickness is about 30mm, the porosity is proper, part of the large particles are cracked in the sintering process, harmful elements such as crystal water, sulfur and the like are fully removed, carbonate is decomposed, certain burning loss occurs, at the moment, part of the bedding material is bonded into blocks by liquid phase of burning and dripping of a sintering mixture on the bedding material in the sintering process, finally more than 60% of the super-special powder particles and non-bonded large particles enter a finished product ore, and the rest of the cracked small particles and powder enter a return ore.
In the embodiment, the mixture comprises the following components in percentage by weight: 56-60% of mixed powder, 25-30% of return fines, 3.6-4% of coal powder, 4-4.5% of limestone, 4-4.5% of dolomite and 3-3.6% of granulated ash.
In the embodiment, the mixture comprises the following components in percentage by weight: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
By adopting the technical scheme, the qualified sintering ore with chemical components meeting the requirements, such as TFe, CaO and SiO, can be obtained after sintering2、MgO、Al2O3S, P, Zn, etc. meet the production requirements of blast furnaces.
In the embodiment, the blending powder comprises the following components in percentage by weight: 20-23% of Calamine, 8-10% of Amylum Arabic powder, 40-46% of Yangdai powder, 3-5% of SiC concentrate, 4-8% of superfine powder, 3-5% of Rake powder, 1-2% of iron dust mud, 3-5% of Niuqian powder and 2-5% of plum extract.
In the embodiment, the blending powder comprises the following components in percentage by weight: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
By adopting the technical scheme, the chemical components are obtained
The required mixed iron powder has TFe plan value of 60.37 percent and SiO2Planned value 4.84%, trace element control: al (Al)2O3The plan value is 1.53%, the Mn plan value is 0.106%, the S plan value is 0.016%, the P plan value is 0.054%, the Zn plan value is 0.021%, and the sintered ore meeting the index requirement can be obtained in the sintering process.
In the embodiment, the granularity of the pulverized coal is 0.5-3 mm.
In this embodiment, the particle size of the limestone is 0-3 mm.
In this example, the dolomite particle size is 0-3 mm.
In this embodiment, the particle ash particle size is 0-3mm, and the particle ash activity is greater than 250 mol.
By adopting the technical scheme, the pulverized coal with proper granularity is used, and the excessively fine pulverized coal can carry out carbon migration along with descending air, so that the heat at the lower part of a material layer is excessive, the air permeability is poor, and the vertical sintering speed and the strength of sintered ore are influenced; the distribution points of the over-coarse coal powder are relatively reduced, and the over-coarse coal powder is easy to segregate, so that the local heat is insufficient, the liquid phase is reduced, the strength of the sintered ore is poor, and the suitable coal powder granularity is 0.5-3 mm; limestone, dolomite and quicklime with the granularity of 0-3mm are sintered, the granularity composition is small and the granules are large, so that the full reaction of the flux in the sintering process is facilitated, the utilization rate and the effect of the flux are improved, the utilization rate of the flux can be improved, and enough and high-quality bonding phase is generated in the sintering process, so that the sintering yield quality index is improved, the drum strength and the yield of the sintering ore can be improved, the solid fuel consumption is reduced, and the granularity composition, the mineral composition and the reducibility of the sintering ore are improved.
In the embodiment, the thickness of the super-fine powder bedding material paved in the sintering machine is 30-40 mm.
By adopting the technical scheme, the large-particle ultra-special powder is directly paved on the grate bar at the bottom layer of the sintering machine trolley in the sintering production process, the grate bar protecting effect can be achieved, the sintering is realized by downward air draft combustion, when the combustion zone moves to the grate bar, the grate bar can be burned out or fused sintering ore is bonded on the grate bar due to the high temperature and the waste gas of the combustion zone, the damage of the grate bar is serious, the service life of equipment is influenced, after the paving bottom material is used, the grate bar can be prevented from being burned out due to the high temperature of the combustion zone, the filtering effect can also be achieved, the powder gap is prevented from being pumped away, the dust content of the waste gas and the load of a dust remover are reduced, the service life of a.
In this example, during sintering, the basicity center value was determined, which was 1.85-2 times.
The sintering process of the large particle super fine powder used as a sintering bed material will be described in detail with reference to the following specific examples.
Example 1
The large-particle super-fine powder provided by the embodiment is used as a sintering process for sintering a bedding material, and the sintering process comprises the following steps:
determining that the alkalinity central value is 1.90 times, and paving a super-special powder bedding material in the sintering machine before the sintering machine is paved into the mixture, wherein the granularity of the super-special powder is 10-20 mm.
Specifically, the mixture comprises the following components in percentage by weight: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
Specifically, the blending powder comprises the following components in percentage by weight: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
Specifically, the granularity of the pulverized coal is 0.5-3 mm.
Specifically, the particle size of the limestone is 0-3 mm.
Specifically, the particle size of the dolomite is 0-3 mm.
Specifically, the particle size of the particle ash is 0-3 mm.
Specifically, the thickness of the super-special powder bedding material paved in the sintering machine is 30 mm.
Example 2
The large-particle super-fine powder provided by the embodiment is used as a sintering process for sintering a bedding material, and the sintering process comprises the following steps:
determining that the alkalinity central value is 1.90 times, and paving a super-special powder bedding material in the sintering machine before the sintering machine is paved into the mixture, wherein the granularity of the super-special powder is 10-20 mm.
Specifically, the mixture comprises the following components in percentage by weight: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
Specifically, the blending powder comprises the following components in percentage by weight: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
Specifically, the granularity of the pulverized coal is 0.5-3 mm.
Specifically, the particle size of the limestone is 0-3 mm.
Specifically, the particle size of the dolomite is 0-3 mm.
Specifically, the particle size of the particle ash is 0-3 mm.
Specifically, the thickness of the super-special powder bedding material paved in the sintering machine is 20 mm.
Example 3
The large-particle super-fine powder provided by the embodiment is used as a sintering process for sintering a bedding material, and the sintering process comprises the following steps:
determining that the alkalinity central value is 1.90 times, and paving a super-special powder bedding material in the sintering machine before the sintering machine is paved into the mixture, wherein the granularity of the super-special powder is 10-20 mm.
Specifically, the mixture comprises the following components in percentage by weight: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
Specifically, the blending powder comprises the following components in percentage by weight: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
Specifically, the granularity of the pulverized coal is 0.5-3 mm.
Specifically, the particle size of the limestone is 0-3 mm.
Specifically, the particle size of the dolomite is 0-3 mm.
Specifically, the particle size of the particle ash is 0-3 mm.
Specifically, the thickness of the super-special powder bedding material paved in the sintering machine is 40 mm.
Experimental example 1
The sintered cakes obtained in examples 1 to 3 were weighed and subjected to a composition test, and the measurement results are shown in Table 1.
TABLE 1
| Percent rate of sintering yield% | Using coefficient t/m2·h | Tumbler index/% | Solid fuel consumption kg/t | |
| Example 1 | 76.46 | 1.1774 | 78.30 | 64.439 |
| Example 2 | 75.45 | 1.1667 | 78.20 | 65.312 |
| Example 3 | 75.50 | 1.1678 | 78.15 | 65.103 |
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A sintering process for using large-particle super-fine powder as a sintering bedding material is characterized by comprising the following steps:
before the mixture is paved in the sintering machine, paving a super-special powder paving base material in the sintering machine, wherein the granularity of the super-special powder is more than or equal to 10 mm.
2. The use of super powder in a bedding material as claimed in claim 1, wherein the mix consists of, in weight percent: 56-60% of mixed powder, 25-30% of return fines, 3.6-4.0% of coal powder, 4-4.5% of limestone, 4-4.5% of dolomite and 3-3.6% of granulated ash.
3. The use of super powder in a bedding material as claimed in claim 2, wherein the mix consists of, in weight percent: 59% of mixed powder, 25% of return fines, 3.7% of coal powder, 4.35% of limestone, 4.4% of dolomite and 3.55% of granulated ash.
4. The use of the super special powder in a bedding foundation as claimed in claim 2 or 3, characterized in that, the mixed powder comprises the following components by weight percent: 20-23% of Calamine, 8-10% of Amylum Arabic powder, 40-46% of Yangdai powder, 3-5% of SiC concentrate, 4-8% of superfine powder, 3-5% of Rake powder, 1-2% of iron dust mud, 3-5% of Niuqian powder and 2-5% of plum extract.
5. The use of super special powder in a bedding foundation as claimed in claim 4, wherein the composition of the mixed powder is as follows by weight percent: 23% of Calomelas, 10% of Amylum Arabic, 46% of Yangdi powder, 4% of SiC concentrate, 5% of super powder, 4% of Rake powder, 2% of iron dust mud, 4% of Niuqian powder and 2% of plum essence.
6. Use of a super fine powder in a bedding foundation according to claim 2 or 3, characterised in that the particle size of the coal powder is 0.5-3 mm.
7. Use of a super powder in a bedding foundation according to claim 2 or 3, characterised in that said limestone has a particle size of 0-3 mm.
8. Use of a super powder in a bedding foundation according to claim 2 or 3, characterised in that the dolomite has a particle size of 0-3 mm.
9. Use of a super powder in a bedding foundation according to claim 2 or 3, characterised in that the particle size of the dust is 0-3 mm.
10. The use of super fine powder in a bedding material as claimed in claim 1, wherein the super fine powder bedding material is laid in the sintering machine to a thickness of 30-40 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126773A (en) * | 2020-07-31 | 2020-12-25 | 武汉钢铁有限公司 | Sintering method for sintering CDQ powder |
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| CN1429920A (en) * | 2001-12-31 | 2003-07-16 | 新疆钢铁研究所 | Application of limonite as base material in pelletizing agglomerate production method |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1429920A (en) * | 2001-12-31 | 2003-07-16 | 新疆钢铁研究所 | Application of limonite as base material in pelletizing agglomerate production method |
Non-Patent Citations (1)
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| 张天启: "《烧结技能知识500问》", 31 August 2012, 冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112126773A (en) * | 2020-07-31 | 2020-12-25 | 武汉钢铁有限公司 | Sintering method for sintering CDQ powder |
| CN112126773B (en) * | 2020-07-31 | 2022-08-02 | 武汉钢铁有限公司 | Sintering method for sintering CDQ powder |
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