CN110453022B - Method for manufacturing charging material of blast furnace by using iron ore powder - Google Patents
Method for manufacturing charging material of blast furnace by using iron ore powder Download PDFInfo
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- CN110453022B CN110453022B CN201910840075.3A CN201910840075A CN110453022B CN 110453022 B CN110453022 B CN 110453022B CN 201910840075 A CN201910840075 A CN 201910840075A CN 110453022 B CN110453022 B CN 110453022B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a method for manufacturing charging materials of a blast furnace by iron ore powder, belonging to the technical field of metallurgy and comprising the following steps: according to the particle size, dividing the iron ore powder to be agglomerated into fine iron ore powder and coarse iron ore powder; mixing and drying the fine-grained iron ore powder and a flux to obtain an iron ore powder mixture; melting the iron ore powder mixture to obtain a liquid phase mixture, wherein the melting temperature is 1300-1500 ℃; and mixing the liquid phase mixture with the coarse-grained iron ore powder, and cooling, crushing and screening to obtain the charging material of the blast furnace.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for manufacturing charging materials of a blast furnace by iron ore powder.
Background
The iron and steel metallurgy mainly adopts a blast furnace smelting mode, and raw materials used by a blast furnace need to be agglomerated in advance to enable the raw materials to have certain granularity so as to ensure the smooth operation of the blast furnace smelting process. The common agglomeration methods are mainly sintering and pelletizing. The sintering method is characterized in that mixed materials of iron ore powder, flux, fuel and the like distributed on a sintering machine are firstly subjected to surface layer ignition, then the materials are sintered downwards in an air draft mode, and the sintered ore is obtained after cooling and crushing. In the pelletizing method, fine iron ore powder, a binder and the like are pelletized on a pelletizing disc, and then the pellets are obtained after high-temperature roasting and cooling.
The sintering method consumes a large amount of solid fuel in the production process, and produces a large amount of pollutants such as sulfur dioxide, nitrogen oxide and the like in the combustion process. Because the air draft process is adopted to produce a large amount of dust and waste gas emission, and a large amount of fine particles are produced in the production process, the production efficiency is not high. The pelletizing method has high requirements on the quality and granularity of raw materials, and is difficult to adapt to the current situations of reduction of high-quality iron ore resources and various iron ore resource sources. Therefore, the research on the iron ore powder agglomeration method with low emission and strong raw material adaptability is urgently needed.
Disclosure of Invention
In view of the above, the present invention has been made to provide a method of charging a blast furnace with iron ore powder that overcomes or at least partially solves the above-mentioned problems.
The embodiment of the invention provides a method for manufacturing charging materials of a blast furnace by iron ore powder, which comprises the following steps:
according to the particle size, dividing the iron ore powder to be agglomerated into fine iron ore powder and coarse iron ore powder;
mixing and drying the fine-grained iron ore powder and a flux to obtain an iron ore powder mixture;
melting the iron ore powder mixture to obtain a liquid phase mixture, wherein the melting temperature is 1300-1500 ℃;
and mixing the liquid phase mixture with the coarse-grained iron ore powder, and cooling, crushing and screening to obtain the charging material of the blast furnace.
Further, the iron ore powder comprises one of the following components: single iron ore powder and mixture of multiple iron ore powders.
Further, the particle sizes of the fine iron ore powder and the coarse iron ore powder are respectively-1 mm and +1 mm.
Further, the flux includes at least one of: quicklime and limestone.
Furthermore, the granularity of the fusing agent is-1 mm.
Further, the drying temperature is 300-1000 ℃, and the drying time is 20-30 min.
Furthermore, in the iron ore powder mixture, CaO and SiO2The mass ratio of (A) to (B) is 4-10: 1.
Further, the cooling temperature is 0-300 ℃, and the cooling time is 40-80 min.
Further, the screening particle size is 6.3 mm.
Further, the blast furnace is filled with CaO and SiO2The mass ratio of (A) to (B) is 1-3: 1.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the method for manufacturing the blast furnace charging materials by the iron ore powder, provided by the embodiment of the invention, the iron ore powder is divided into coarse particles and fine particles according to the particle size, wherein the coarse particles are +1mm, and the fine particles are-1 mm. Based on the chemical components of the iron ore powder and the flux, according to the set binary alkalinity, namely CaO content and SiO2The proportion of the two can be obtained by the ratio of the contents, under higher binary alkalinity, the mixed material of the fine iron ore powder and the flux is easy to generate low-melting-point calcium ferrite, so that a liquid phase taking the calcium ferrite as a main component is obtained at high temperature, the required using amount of the coarse iron ore powder is calculated by controlling the binary alkalinity of the final furnace charge, and then the coarse iron ore powder is taken as aggregate to be mixed and consolidated with the liquid phase, so that the required high-quality furnace charge is obtained.
According to the embodiment of the invention, a high-temperature melting process is adopted when the liquid phase is obtained, no blast or air draft is needed, the discharge amount of pollutants and waste gas is less, and the solid fuel and the binder are not added into the raw materials, so that the negative influence of the ash content of the fuel and the binder on the grade of the charging material is avoided.
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 or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
the application provides a method for manufacturing charging materials of a blast furnace by iron ore powder, which comprises the following steps:
according to the particle size, dividing the iron ore powder to be agglomerated into fine iron ore powder and coarse iron ore powder;
mixing and drying the fine-grained iron ore powder and a flux to obtain an iron ore powder mixture;
melting the iron ore powder mixture to obtain a liquid phase mixture, wherein the melting temperature is 1300-1500 ℃;
and mixing the liquid phase mixture with the coarse-grained iron ore powder, and cooling, crushing and screening to obtain the charging material of the blast furnace.
In the present application, the iron ore powder includes one of the following: single iron ore powder and mixture of multiple iron ore powders.
In the present application, the particle sizes of the fine iron ore powder and the coarse iron ore powder are-1 mm and +1mm, respectively.
In the present application, the flux includes at least one of: quicklime and limestone.
In the present application, the flux particle size is-1 mm.
In the application, the drying temperature is 300-1000 ℃, and the drying time is 20-30 min.
In the present application, in the iron ore powder mixture, CaO and SiO2The mass ratio of (A) to (B) is 4-10: 1.
In the application, the cooling temperature is 0-300 ℃, and the cooling time is 40-80 min.
In the present application, the sieve size is 6.3 mm.
In this application, the blast furnace is charged with CaO and SiO2The mass ratio of (A) to (B) is 1-3: 1.
The method for charging a blast furnace with iron ore powder according to the present application will be described in detail with reference to the following embodiments.
Example 1
Single magnetic fine powder with the particle size of-0.15 mm is used as fine-grained iron ore powder, single iron ore particles with the particle size of +1mm are used as coarse-grained iron ore powder, limestone with the particle size of-1 mm is used as a fusing agent, and all materials are expressed by dry basis mass percentage. Uniformly mixing 31.7% of fine-grained iron ore powder and 13.0% of flux, drying, and melting into a liquid phase with binary alkalinity of 4.0 at 1500 ℃; mixing the obtained liquid phase with 55.3% coarse-grained iron ore powder, and obtaining the charging material with the binary alkalinity of 2.0 after cooling, crushing and screening.
Example 2
Single iron ore powder with the thickness of-1 mm is taken as fine iron ore powder, mixed iron ore particles with the thickness of +1mm are taken as coarse iron ore powder, a mixture of quick lime with the thickness of-1 mm and limestone is taken as a fusing agent, and all materials are expressed by mass percentage on a dry basis. Uniformly mixing 24.5% fine iron ore powder and 13.5% flux, drying, and melting into a liquid phase with binary alkalinity of 6.0 at 1400 ℃; mixing the obtained liquid phase with 62.0% coarse-grained iron ore powder, and obtaining the charging material with the binary alkalinity of 2.0 after cooling, crushing and screening.
Example 3
The mixed iron ore powder with the particle size of minus 1mm is used as fine iron ore powder, the mixed iron ore particles with the particle size of plus 1mm are used as coarse iron ore powder, the quick lime with the particle size of minus 1mm is used as a fusing agent, and all materials are expressed by mass percentage on a dry basis. Uniformly mixing 27.1% fine iron ore powder and 5.7% flux, drying, and melting into a liquid phase with binary alkalinity of 4.0 at 1400 ℃; mixing the obtained liquid phase with 67.2% coarse-grained iron ore powder, and obtaining the charging material with the binary alkalinity of 1.3 after cooling, crushing and screening.
Example 4
The mixed iron ore powder with the particle size of minus 1mm is used as fine iron ore powder, single iron ore particles with the particle size of plus 1mm are used as coarse iron ore powder, quicklime with the particle size of minus 1mm is used as a fusing agent, and all materials are expressed by mass percentage on a dry basis. Uniformly mixing 27.0% fine-grained iron ore powder and 15.9% flux, drying, and melting into a liquid phase with the binary alkalinity of 10.0 at 1400 ℃; mixing the obtained liquid phase with 57.1% coarse-grained iron ore powder, and obtaining the charging material with the binary alkalinity of 3.0 after cooling, crushing and screening.
The raw material and charge ingredients in examples 1-4 are shown in Table 1.
TABLE 1
Compared with the prior art, the method for manufacturing the charging material of the blast furnace by the iron ore powder has the following characteristics:
the requirement on the grade of iron ore powder resources is low, and various iron ore powder resources can be reasonably utilized; solid fuel is not needed, pollutants such as sulfur dioxide and nitrogen oxide generated by the combustion of the solid fuel are not generated, and the negative influence of fuel ash on the components of the fed materials is avoided; the produced furnace charge has high level, large alkalinity adjustable range, small waste gas discharge amount in the production process and low pollutant content in the waste gas.
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 (4)
1. A method for manufacturing charging materials of a blast furnace by iron ore powder is characterized by comprising the following steps:
dividing the iron ore powder to be agglomerated into fine iron ore powder and coarse iron ore powder according to the particle size, wherein the particle sizes of the fine iron ore powder and the coarse iron ore powder are respectively-1 mm and +1 mm;
mixing and drying the fine-grained iron ore powder and a flux to obtain an iron ore powder mixture, wherein the granularity of the flux is-1 mm, the drying temperature is 300-1000 ℃, the drying time is 20-30min, and CaO and SiO in the iron ore powder mixture2The mass ratio of (A) to (B) is 4-10: 1;
melting the iron ore powder mixture to obtain a liquid phase mixture, wherein the melting temperature is 1300-1500 ℃;
mixing the liquid phase mixture with the coarse-grained iron ore powder, cooling, crushing and screening to obtain a blast furnace charging material, wherein the screening granularity is 6.3mm, and CaO and SiO are contained in the blast furnace charging material2The mass ratio of (A) to (B) is 1-3: 1.
2. the method for manufacturing the charging material of the blast furnace by the iron ore powder according to claim 1, wherein the iron ore powder comprises one of the following materials: single iron ore powder and mixture of multiple iron ore powders.
3. The method for manufacturing the charging material of the blast furnace by the iron ore powder as claimed in claim 1, wherein the flux comprises at least one of the following components: quicklime and limestone.
4. The method for manufacturing the charging material of the blast furnace by the iron ore powder as claimed in claim 1, wherein the cooling temperature is 0-300 ℃, and the cooling time is 40-80 min.
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| CN201910840075.3A CN110453022B (en) | 2019-09-05 | 2019-09-05 | Method for manufacturing charging material of blast furnace by using iron ore powder |
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| CN201910840075.3A CN110453022B (en) | 2019-09-05 | 2019-09-05 | Method for manufacturing charging material of blast furnace by using iron ore powder |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4063930A (en) * | 1974-11-22 | 1977-12-20 | Republic Steel Corporation | Preparation of weatherable ferrite agglomerate |
| CN105063261A (en) * | 2015-08-20 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Production method of furnace burden for blast furnace ironmaking |
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- 2019-09-05 CN CN201910840075.3A patent/CN110453022B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4063930A (en) * | 1974-11-22 | 1977-12-20 | Republic Steel Corporation | Preparation of weatherable ferrite agglomerate |
| CN105063261A (en) * | 2015-08-20 | 2015-11-18 | 山西太钢不锈钢股份有限公司 | Production method of furnace burden for blast furnace ironmaking |
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