CN115216320B - Production method of iron-carbon composite furnace burden - Google Patents
Production method of iron-carbon composite furnace burden Download PDFInfo
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- CN115216320B CN115216320B CN202210988338.7A CN202210988338A CN115216320B CN 115216320 B CN115216320 B CN 115216320B CN 202210988338 A CN202210988338 A CN 202210988338A CN 115216320 B CN115216320 B CN 115216320B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
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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
- C21B5/007—Conditions of the cokes or characterised by the cokes used
-
- 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
-
- 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
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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
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- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Coke Industry (AREA)
Abstract
The invention discloses a production method of an iron-carbon composite furnace charge, which comprises the steps of mixing magnetite concentrate, fat coal A, fat coal B, coking coal A and coking coal B according to a certain proportion, uniformly mixing, refining into iron coke through a specific heating curve, discharging the iron coke, and cooling through a specific quenching mode after discharging to obtain the iron-carbon composite furnace charge. The iron-carbon composite furnace burden can replace part of coke, and can pre-metalize magnetite concentrate, so that the energy consumption of the blast furnace is reduced.
Description
Technical Field
The invention belongs to the technical field of coking, and particularly relates to a production method of an iron-carbon composite furnace burden.
Background
The contradiction between the steel yield and the high-quality coking coal resource in China and the environment-friendly situation is increasingly prominent, so that the iron-making process is optimized, and the blast furnace carbon reduction and emission reduction are realized. The improvement of the carbon utilization rate is to reduce the coke ratio of the blast furnace and CO 2 An effective measure of emissions. At present, the production methods of iron-carbon composite furnace burden are numerous, but the high reactivity of the iron-carbon composite furnace burden is utilized to reduce the temperature of a blast furnace heat reserve area so as to improve the reaction efficiency of the blast furnace and realize low-carbon iron making of the blast furnace. Therefore, a new method for producing the iron-carbon composite furnace burden, which does not influence the reaction efficiency of the blast furnace and can realize carbon reduction and emission reduction, is necessary to be researched.
Disclosure of Invention
The invention aims to disclose a novel production method of iron-carbon composite furnace burden, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the production method of the iron-carbon composite furnace burden comprises the following preparation raw materials and preparation processes:
preparation of raw materials
The preparation raw materials of the iron-carbon composite furnace burden comprise magnetite concentrate, fat coal A, fat coal B, coking coal A and coking coal B, wherein the magnetite concentrate is prepared from the following raw materials: fat coal a: fat coal B: coking coal A: the mass ratio of the coking coal B is 1: (0.5-1): (3-6): (1-5): (2-4);
preparation process
1) Crushing magnetite concentrate to below 200 meshes;
2) Weighing fat coal A, fat coal B, coking coal A and coking coal B according to the mass ratio, crushing until the proportion of the fat coal A, the fat coal B, the coking coal A and the coking coal B is less than 3mm and is more than 80%, and uniformly mixing;
3) Adding water into the mixed dry coal material obtained in the step 2) while stirring, wherein the water addition amount is 8-12% of the mass of the mixed dry coal material;
4) Uniformly stirring the water-containing mixed coal material obtained in the step 3) and adding magnetite concentrate;
5) Charging the mixed material obtained in the step 4) into a coke oven, and setting a coking temperature curve to be 800-850 ℃: 5-7 hours, 850-900℃: 5-7 hours, 900-1000℃: 3-5 hours, 1000-1050℃: 3-5 hours;
6) And 5) starting coking according to the coking temperature range set in the step 5), and cooling the discharged materials to below 400 ℃ under the protection of nitrogen after the coking is finished, so that the preparation of the iron-carbon composite furnace burden is completed.
In the preparation process, the magnetite concentrate is the magnetite concentrate with iron content of more than or equal to 62.0%, ferrous content of 22.0-25.0% and silicon dioxide content of less than or equal to 7%. Ad of fat coal a: 10.5-12%, vdaf: 31-32%, st.d: less than or equal to 2 percent and G more than or equal to 85 percent. Ad of fat coal B: 6-8%, vdaf:26-28%, st.d: less than or equal to 1.5 percent and G more than or equal to 85 percent. Ad of coking coal A: 11.5-12%, vdaf:18-20%, st.d: less than or equal to 0.7 percent, and the G value is 75 to 80 percent. Ad of coking coal B: 9.0-10.0%, vdaf:26-28%, st.d: less than or equal to 0.9 percent, and the G value is 80 to 85 percent.
Wherein, ad: air drying base, vdaf: dry ashless based volatiles, st.d: dry base total sulfur, G: adhesive index.
The iron-carbon composite furnace burden produced by the preparation process has the following performance data:
evaluation of Cold Property
The cold strength was measured at room temperature by the drop method and the drum method, respectively.
The crushing strength M40 is more than 80% by adopting a dropping method, and the wear resistance M10 is less than 10% by adopting a drum method.
Evaluation of thermal Property
Weighing a charge material sample with certain mass, placing the charge material sample in a reactor, reacting with carbon dioxide for 2 hours at the temperature of (1000+/-5), and measuring the reactivity CRI of the charge material sample to be less than 30%;
after the furnace burden sample after the reaction is subjected to a rotary drum test, the CSR of the furnace burden sample is measured to be more than 50 percent.
In summary, the cold state performance and the hot state performance of the iron-carbon composite furnace burden produced by the method can meet the requirement of using coke in the blast furnace at present according to the cold state performance and the hot state performance of the coke, and the iron-carbon composite furnace burden produced by the method can lead magnetite concentrate to be pre-metallized and does not weaken the function of the coke in the blast furnace.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The preparation raw materials (in weight percent):
magnetite concentrate: 10 percent of fat coal A, 10 percent of fat coal B:30%, coking coal A:30%, coking coal B:20%.
Preparation process
1) Weighing 4.0kg of magnetite concentrate, and crushing to below 200 meshes;
2) Weighing 4.0kg of fat coal A, 12.0kg of fat coal B, 12.0kg of coking coal A and 8.0kg of coking coal B which are crushed to be less than 3mm and have the proportion of more than 80%, and adding 3.6kg of water while stirring after uniformly mixing;
3) Uniformly adding the magnetite concentrate prepared in the step 1) into the mixed wet coal;
4) Loading the mixed material prepared in the step 3) into a coke oven, and setting a coking temperature curve to 800-850 ℃ for 6 hours, 850-900 ℃ for 6 hours, 900-1000 ℃ for 4 hours and 1000-1050 ℃ for 4 hours;
5) And after refining, discharging, and cooling to below 400 ℃ under the protection of nitrogen to obtain the iron-carbon composite furnace burden.
Evaluation of performance: the measured M40, M10 and CRI of the iron-carbon composite furnace burden are 84.8%, 26.9% and 50.5% respectively, so that the requirement of using coke in a blast furnace is met, and the metallization rate is 85%.
Example 2
The preparation raw materials (in weight percent):
10% of magnetite concentrate, 8% of fat coal A, 32% of fat coal B, 30% of coking coal A and 20% of coking coal B.
Preparation process
1) Weighing 4.0kg of magnetite concentrate, and crushing to below 200 meshes;
2) Weighing 3.2kg of fat coal A, 12.8kg of fat coal B, 12.0kg of coking coal A and 8.0kg of coking coal B which are crushed to be less than 3mm and have the proportion of more than 80%, uniformly mixing, adding 3.6kg of water while stirring, and spraying the water;
3) Uniformly adding the magnetite concentrate prepared in the step 1) into the mixed wet coal;
4) Loading the mixture prepared in the step 3) into a furnace, and setting the coking temperature curve to 800-850 ℃ for 6 hours, 850-900 ℃ for 6 hours, 900-1000 ℃ for 4 hours and 1000-1050 ℃ for 4 hours.
5) And after refining, discharging, and cooling to below 400 ℃ under the protection of nitrogen to obtain the iron-carbon composite furnace burden.
Evaluation of performance: the iron-carbon composite material has the M40 of 81.2%, the M10 of 8.8%, the CRI of 26.6% and the CSR of 52.6%, meets the requirement of using coke in a blast furnace, and has the metallization rate of 87%.
Claims (2)
1. The production method of the iron-carbon composite furnace burden is characterized by comprising the following preparation raw materials and preparation processes:
preparation of raw materials
The preparation raw materials of the iron-carbon composite furnace burden comprise magnetite concentrate, fat coal A, fat coal B, coking coal A and coking coal B, wherein the magnetite concentrate is prepared from the following raw materials: fat coal a: fat coal B: coking coal A: the mass ratio of the coking coal B is 1: (0.5-1): (3-6): (1-5): (2-4); ad of fat coal a: 10.5-12%, vdaf: 31-32%, st.d: less than or equal to 2 percent, G is more than or equal to 85 percent;
ad of fat coal B: 6-8%, vdaf:26-28%, st.d: less than or equal to 1.5 percent, G is more than or equal to 85 percent;
ad of coking coal A: 11.5-12%, vdaf:18-20%, st.d: less than or equal to 0.7%, and the G value is 75-80%;
ad of coking coal B: 9.0-10.0%, vdaf:26-28%, st.d: less than or equal to 0.9 percent, and the G value is 80 to 85 percent
Preparation process
1) Crushing magnetite concentrate to below 200 meshes;
2) Weighing fat coal A, fat coal B, coking coal A and coking coal B according to the mass ratio, crushing until the proportion of the fat coal A, the fat coal B, the coking coal A and the coking coal B is less than 3mm and is more than 80%, and uniformly mixing;
3) Adding water into the mixed dry coal material obtained in the step 2) while stirring, wherein the water addition amount is 8% -12% of the mass of the mixed dry coal material;
4) Uniformly stirring the water-containing mixed coal material obtained in the step 3) and adding magnetite concentrate;
5) Charging the mixed material obtained in the step 4) into a coke oven, and setting a coking temperature curve to be 800-850 ℃: 5-7 hours, 850-900℃: 5-7 hours, 900-1000℃: 3-5 hours, 1000-1050℃: 3-5 hours;
6) And 5) starting coking according to the coking temperature range set in the step 5), and cooling the discharged materials to below 400 ℃ under the protection of nitrogen after the coking is finished, so that the preparation of the iron-carbon composite furnace burden is completed.
2. The method for producing the iron-carbon composite furnace burden according to claim 1, wherein the method comprises the following steps of: the magnetite concentrate is the magnetite concentrate with iron content more than or equal to 62.0%, ferrous content 22.0-25.0% and silicon dioxide content less than or equal to 7%.
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| JPH06136365A (en) * | 1992-10-29 | 1994-05-17 | Nippon Steel Corp | Production of coke |
| JP2001288477A (en) * | 2000-04-04 | 2001-10-16 | Nippon Steel Corp | Method for preparing high-reactivity coke for blast furnace |
| CN103468287A (en) * | 2013-09-22 | 2013-12-25 | 重庆大学 | Preparation method of high strength-hyper reactivity iron containing coke |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN104119939A (en) * | 2014-08-04 | 2014-10-29 | 东北大学 | Hot briquetted iron coke for iron-making and preparation method thereof |
| WO2018094885A1 (en) * | 2016-11-24 | 2018-05-31 | 武汉科思瑞迪科技有限公司 | Shaft furnace process for producing iron coke |
| CN111389859A (en) * | 2020-03-20 | 2020-07-10 | 安徽工业大学 | Method for recovering iron powder by direct reduction of red mud |
| CN112080311A (en) * | 2020-08-17 | 2020-12-15 | 山西阳光焦化集团股份有限公司 | Coking coal blending and coking method for producing primary metallurgical coke by blending a large amount of lean coal |
| WO2021239096A1 (en) * | 2020-05-29 | 2021-12-02 | 宝山钢铁股份有限公司 | Preparation method for carbon-iron composite furnace burden |
| CN114656988A (en) * | 2022-04-02 | 2022-06-24 | 重庆大学 | Iron-titanium composite coke for low-carbon iron making and manufacturing method thereof |
-
2022
- 2022-08-17 CN CN202210988338.7A patent/CN115216320B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06136365A (en) * | 1992-10-29 | 1994-05-17 | Nippon Steel Corp | Production of coke |
| JP2001288477A (en) * | 2000-04-04 | 2001-10-16 | Nippon Steel Corp | Method for preparing high-reactivity coke for blast furnace |
| CN103468287A (en) * | 2013-09-22 | 2013-12-25 | 重庆大学 | Preparation method of high strength-hyper reactivity iron containing coke |
| CN103468289A (en) * | 2013-09-27 | 2013-12-25 | 武汉科技大学 | Iron coke for blast furnace and preparing method thereof |
| CN104119939A (en) * | 2014-08-04 | 2014-10-29 | 东北大学 | Hot briquetted iron coke for iron-making and preparation method thereof |
| WO2018094885A1 (en) * | 2016-11-24 | 2018-05-31 | 武汉科思瑞迪科技有限公司 | Shaft furnace process for producing iron coke |
| CN111389859A (en) * | 2020-03-20 | 2020-07-10 | 安徽工业大学 | Method for recovering iron powder by direct reduction of red mud |
| WO2021239096A1 (en) * | 2020-05-29 | 2021-12-02 | 宝山钢铁股份有限公司 | Preparation method for carbon-iron composite furnace burden |
| CN112080311A (en) * | 2020-08-17 | 2020-12-15 | 山西阳光焦化集团股份有限公司 | Coking coal blending and coking method for producing primary metallurgical coke by blending a large amount of lean coal |
| CN114656988A (en) * | 2022-04-02 | 2022-06-24 | 重庆大学 | Iron-titanium composite coke for low-carbon iron making and manufacturing method thereof |
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