CN114525370A - Furnace burden structure for blast furnace high-ball ratio smelting - Google Patents
Furnace burden structure for blast furnace high-ball ratio smelting Download PDFInfo
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- CN114525370A CN114525370A CN202210134639.3A CN202210134639A CN114525370A CN 114525370 A CN114525370 A CN 114525370A CN 202210134639 A CN202210134639 A CN 202210134639A CN 114525370 A CN114525370 A CN 114525370A
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a furnace charge structure for blast furnace blast-furnace high-sphericity ratio smelting, which comprises the following components in percentage by weight: 50% of high-alkalinity sinter, 30-35% of alkaline pellet and 15-20% of acid pellet, wherein the proportion of the alkaline pellet is 1.5-2.3 times that of the acid pellet. The invention aims to provide a furnace charge structure for blast furnace high-sphericity ratio smelting, which aims at the actual requirement of steel-coated large-proportion pellet smelting and aims at optimizing the comprehensive metallurgical performance of the furnace charge structure of the steel-coated blast furnace and develops a reasonable furnace charge structure under the condition of the steel-coated blast furnace high-sphericity ratio smelting.
Description
Technical Field
The invention relates to the technical field of iron-making raw material agglomeration, in particular to a furnace charge structure for blast furnace high-ball ratio smelting.
Background
The shape and thickness of the reflow zone have important influence on the operation and the stable running of the blast furnace, and how to improve the metallurgical properties (including reducibility and reflow properties) of the comprehensive furnace charge to improve the air permeability of the blast furnace is always the key point of blast furnace smelting research. However, for blast furnace smelting, the metallurgical properties of a single charge cannot be completely used for characterizing and evaluating the overall properties of a comprehensive charge. In the blast furnace smelting process, various single furnace materials are not simply and physically mixed, and the acid furnace materials and sinter have complex interaction in a high-temperature zone of the blast furnace. Therefore, the invention aims at the actual requirement of smelting the steel-coated large-proportion pellets and aims at optimizing the comprehensive metallurgical performance of the furnace charge structure of the steel-coated blast furnace, and the reasonable furnace charge structure under the smelting condition of the steel-coated blast furnace blast ball ratio is researched and developed.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a charging material structure for blast furnace high-ball ratio smelting
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a furnace charge structure for blast furnace high-sphericity ratio smelting, which comprises the following components in percentage by weight: the high-alkalinity sintered ore comprises 50 percent of high-alkalinity sintered ore, 30-35 percent of alkaline pellet and 15-20 percent of acid pellet, wherein the proportion of the alkaline pellet is 1.5-2.3 times that of the acid pellet.
Furthermore, the reduction of the blast furnace blast ball ratio of the smelting comprehensive furnace burden is more than or equal to 75 percent, and the reduction degradation rate (+3.15mm) is more than or equal to 85 percent.
Further, the paint comprises the following components in percentage by weight: the high-alkalinity agglomerate is 50%, the alkaline pellet is 35%, and the acid pellet is 15%.
Further, the high-alkalinity sintered ore comprises the following chemical components in percentage by weight: 56.0-56.5% of TFe, 8.5-9.0% of FeO, 1.9-2.0% of MgO, 10.4-10.6% of CaO and Al2O3≤1.5～1.7％，SiO25.05 to 5.15%, K2O≤0.15％，Na2O is less than or equal to 0.15 percent, and F is less than or equal to 0.25 percent; the drum strength of the high-alkalinity sinter ore is more than or equal to 79 percent.
Further, the alkaline pellet comprises the following chemical components in percentage by weight: 62.5 to 63.0 percent of TFe, less than or equal to 0.5 percent of FeO, 1.1 to 1.2 percent of MgO, 3.3 to 3.4 percent of CaO and Al2O30.3 to 0.5% of SiO22.5 to 2.7%, K2O≤0.15％，Na2O is less than or equal to 0.15 percent, and F is less than or equal to 0.25 percent; the compressive strength of the alkaline pellet ore is more than or equal to 2500N/P, and the reduction expansion rate is less than or equal to 20%.
Further, the chemical components of the acid pellets comprise, by weight: 62.0 to 62.5 percent of TFe, less than or equal to 0.5 percent of FeO, 0.9 to 1.0 percent of MgO, 0.7 to 0.9 percent of CaO, and Al2O30.3 to 0.5% of SiO24.9-5.5 percent of the total weight of the composition, less than or equal to 0.15 percent of K2O and Na2O≤0.15％，F≤0.25％；The compressive strength of the alkaline pellet ore is more than or equal to 2500N/P, and the reduction expansion rate is less than or equal to 20%.
Compared with the prior art, the invention has the beneficial technical effects that:
aiming at the actual requirement of smelting the steel-coated large-proportion pellets, the invention aims at optimizing the comprehensive metallurgical performance of the furnace charge structure of the steel-coated blast furnace and develops the reasonable furnace charge structure under the smelting condition of the steel-coated blast furnace with high ball ratio.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
The charge material structure schemes and metallurgical performance results of the comparative example and the example are respectively shown in tables 1 and 2.
Table 1 comparative and example charge materials structure schemes
TABLE 2 metallurgical properties of the examples and comparative examples
| Furnace charge structure | RI％ | Reduction degradation rate>3.15mm，％ |
| Comparative example | 58.16 | 78.8 |
| Example 1 | 61.74 | 83.4 |
| Example 2 | 69.29 | 89.5 |
| Example 3 | 74.59 | 90.8 |
| Example 4 | 81.34 | 86.9 |
| Example 5 | 76.27 | 86.3 |
As can be seen from the above table:
(1) under the structural condition of 75% sintering and 25% acid pellet burden, the reduction of the comprehensive burden is obviously reduced along with the improvement of the proportion of the concentrate produced by the burden. 50 percent of ultrahigh alkalinity sinter ore is matched with 50 percent of acid pellet ore, and the comprehensive furnace burden has the worst reducibility.
(2) Under the condition that the charge-to-pellet ratio is 50%, the comprehensive furnace burden reducibility tends to increase first and then decrease with the increase of the proportion of the alkaline pellets. Along with the improvement of the alkaline pellets, the difference trend of the reducibility of the comprehensive charging materials with different ratios of the self-produced ore concentrate fed into the furnace is a trend that the charging materials are reduced first and then increased, and the proper ratio of the alkaline pellets is 30-35 percent, the ratio of the acid pellets is 15-20 percent, and the ratio of the alkaline pellets is 1.5-2.3 times that of the acid pellets.
(3) The reduction degradation performance of the comprehensive charging material is superior to that of the charging material adopting 25% pellets by adopting a charging material structure with a ball ratio of 50%, mainly because the reduction degradation performance of the pellets (whether alkaline pellets or acid pellets) is superior to that of sinter. The comprehensive charge reduction degradation index is optimally controlled to be 30-35% of the charge alkaline pellet proportion.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (6)
1. The utility model provides a furnace charge structure of blast furnace high ball ratio smelting which characterized in that: comprises the following components in percentage by weight: 50% of high-alkalinity sinter, 30-35% of alkaline pellet and 15-20% of acid pellet, wherein the proportion of the alkaline pellet is 1.5-2.3 times that of the acid pellet.
2. The charge material structure for blast furnace blast-furnace ball ratio smelting according to claim 1, characterized in that: the reduction property of the blast furnace blast ball ratio smelting comprehensive furnace charge is more than or equal to 75 percent, and the reduction degradation rate is more than or equal to 85 percent.
3. The charge material structure for blast furnace blast-furnace ball ratio smelting according to claim 1, characterized in that: comprises the following components in percentage by weight: 50% of high-alkalinity sinter, 35% of alkaline pellet and 15% of acidic pellet.
4. The charge material structure for blast furnace blast-furnace ball ratio smelting according to claim 1, characterized in that: the high-alkalinity sintered ore comprises the following chemical components in percentage by weight: 56.0 to 56.5 percent of TFe, 8.5 to 9.0 percent of FeO, 1.9 to 2.0 percent of MgO, 10.4 to 10.6 percent of CaO, and Al2O3≤1.5～1.7％，SiO25.05 to 5.15%, K2O≤0.15％，Na2O is less than or equal to 0.15 percent, and F is less than or equal to 0.25 percent; the drum strength of the high-alkalinity sinter ore is more than or equal to 79 percent.
5. The charge material structure for blast furnace blast-furnace ball ratio smelting according to claim 1, characterized in that: the alkaline pellet comprises the following chemical components in percentage by weight: 62.5 to 63.0 percent of TFe, less than or equal to 0.5 percent of FeO, 1.1 to 1.2 percent of MgO, 3.3 to 3.4 percent of CaO and Al2O30.3 to 0.5% of SiO22.5 to 2.7%, K2O≤0.15％，Na2O is less than or equal to 0.15 percent, and F is less than or equal to 0.25 percent; the compressive strength of the alkaline pellet ore is more than or equal to 2500N/P, and the reduction expansion rate is less than or equal to 20%.
6. The charge material structure for blast furnace blast-furnace ball ratio smelting according to claim 1, characterized in that: the acid pellet comprises the following chemical components in percentage by weight: 62.0 to 62.5 percent of TFe, less than or equal to 0.5 percent of FeO, 0.9 to 1.0 percent of MgO, 0.7 to 0.9 percent of CaO, and Al2O30.3 to 0.5% of SiO24.9-5.5 percent of the total weight of the composition, less than or equal to 0.15 percent of K2O and Na2O is less than or equal to 0.15 percent, and F is less than or equal to 0.25 percent; the compressive strength of the alkaline pellet ore is more than or equal to 2500N/P, and the reduction expansion rate is less than or equal to 20%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210134639.3A CN114525370A (en) | 2022-02-14 | 2022-02-14 | Furnace burden structure for blast furnace high-ball ratio smelting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210134639.3A CN114525370A (en) | 2022-02-14 | 2022-02-14 | Furnace burden structure for blast furnace high-ball ratio smelting |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894367A (en) * | 2014-03-05 | 2015-09-09 | 吕庆 | Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer |
| CN110578024A (en) * | 2019-10-22 | 2019-12-17 | 山西太钢不锈钢股份有限公司 | Method for improving pressure difference in blast furnace high pellet smelting furnace |
| CN112899423A (en) * | 2021-01-19 | 2021-06-04 | 东北大学 | Blast furnace smelting furnace charge containing chromium type vanadium titano-magnetite and blast furnace smelting method |
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- 2022-02-14 CN CN202210134639.3A patent/CN114525370A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104894367A (en) * | 2014-03-05 | 2015-09-09 | 吕庆 | Sintering technology for acidic pellet ore and alkaline material mixed ultra-thick material layer |
| CN110578024A (en) * | 2019-10-22 | 2019-12-17 | 山西太钢不锈钢股份有限公司 | Method for improving pressure difference in blast furnace high pellet smelting furnace |
| CN112899423A (en) * | 2021-01-19 | 2021-06-04 | 东北大学 | Blast furnace smelting furnace charge containing chromium type vanadium titano-magnetite and blast furnace smelting method |
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