CN112159896A - High-magnesium internal combustion acid pellet ore - Google Patents
High-magnesium internal combustion acid pellet ore Download PDFInfo
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- CN112159896A CN112159896A CN202011034008.1A CN202011034008A CN112159896A CN 112159896 A CN112159896 A CN 112159896A CN 202011034008 A CN202011034008 A CN 202011034008A CN 112159896 A CN112159896 A CN 112159896A
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- magnesium
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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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
- C22B1/02—Roasting processes
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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
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a high-magnesium internal combustion acid pellet which is prepared from the following raw materials: 93-95% of magnetite concentrate, 1.2-1.5% of high-magnesium powder, 1.8-2.5% of bentonite and 2-3% of gas ash. The raw materials of the invention are cooperated with each other in a specific proportion, so that the high-temperature metallurgical performance of the pellet ore is obviously improved, the reduction degree is increased by 6-8 percent, the high-temperature refractoriness under load is increased by 90 +/-5 ℃, and the softening range is reduced by 100 +/-5 ℃. The invention achieves the purpose of increasing the magnesium content of the pellet under the condition of not increasing the alkalinity by adding the magnesium powder, and simultaneously, the gas ash is added into the pellet, thereby reducing the roasting temperature of the magnesium-containing pellet, optimizing the pellet roasting process parameters and improving the reduction degree of the pellet.
Description
Technical Field
The invention belongs to the technical field of pellets for blast furnace ironmaking production, and particularly relates to a high-magnesium internal combustion acid pellet.
Background
The most of domestic blast furnaces have long adopted a furnace burden structure of high-alkalinity sinter ore matched with acid pellet ore. The furnace charge structure has complementarity, and can exert the superiorities of good metallurgical performance of high-alkalinity sintering ore and high grade, uniform granularity, good strength and low alkalinity of pellet ore to the maximum extent. But the difference of metallurgical properties of the sintered ore and the pellet ore also brings certain influence on the operation of the blast furnace. The main expression is that the softening performance of the two is different, the softening temperature of the pellet is low, and the pellets are easy to form slag and drop in the early stage (especially the pellets with higher silicon content), thereby influencing the air permeability of the furnace body part and the distribution of the gas flow.
Disclosure of Invention
The invention aims to provide a high-magnesium internal combustion acid pellet which can not only reduce the capacity of the pellet, but also improve the metallurgical performance of the pellet and ensure the stable and smooth operation of a blast furnace.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a high-magnesium internal combustion acid pellet ore, which is prepared from the following raw materials by the method:
the raw materials are proportioned as follows by weight percent:
93-95% of magnetite concentrate, 1.2-1.5% of high-magnesium powder, 1.8-2.5% of bentonite and 2-3% of gas ash;
the preparation method comprises the following steps:
(1) weighing and uniformly mixing the magnetite concentrate, the high magnesium powder, the gas ash and the bentonite according to a proportion to obtain a mixed dry material;
(2) adding the mixed dry material into a pelletizing disc to pre-add water to obtain a mixed wet material, wherein the pre-added water amount of the mixed wet material is 2-2.5% lower than the total added water amount;
(3) starting a balling disk and adjusting the frequency of a variable-frequency speed regulator of the balling disk to 10Hz, taking a mixed wet material to make a mother ball, then spraying water while adding the mixed wet material until a green ball grows up, adjusting the frequency of the variable-frequency speed regulator of the balling disk to 15Hz, and stopping balling after compacting for 2 minutes;
(4) and (3) sending the green pellets to a pellet roasting furnace for drying, preheating, roasting, soaking and cooling in sequence to obtain the finished product of the high-magnesium internal combustion acid pellet ore. Wherein, the temperature is gradually increased to 650 +/-10 ℃ from 200 +/-5 ℃ during drying, and the drying time is 6 minutes; gradually raising the temperature from 650 +/-10 ℃ to 1100 +/-10 ℃ during preheating, wherein the preheating time is 15 minutes; the temperature is gradually increased from 1100 ℃ to 1300 +/-10 ℃ during roasting, and the roasting time is 18 minutes; the temperature is gradually reduced from 1300 +/-10 ℃ to 1100 +/-10 ℃ during soaking, and the soaking time is 15 minutes; the temperature is gradually cooled from 1100 ℃ to 250 ℃ during cooling, the early-stage slow cooling and the later-stage fast cooling are carried out, and the total cooling time is 40 minutes.
The magnetite concentrate is magnetite concentrate with iron content more than or equal to 62.0%, ferrous content 22.0-25.0%, silicon dioxide less than or equal to 7%, and granularity-200 meshes more than or equal to 80.0%.
The content of magnesium oxide in the high-magnesium powder is more than or equal to 87 percent, and the granularity of 200 meshes is more than or equal to 90 percent.
The carbon content in the gas ash is more than or equal to 30 percent, and the granularity of 200 meshes is more than or equal to 90 percent.
The iron content of the high-magnesium internal-combustion acid pellet ore is more than or equal to 61.0 percent, the ferrous content is less than or equal to 1.0 percent, and the magnesium oxide content is 2.1-2.5 percent; the binary alkalinity is 0.2-0.25 times, and the compressive strength is more than or equal to 2000N.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-magnesium internal-combustion acid pellet ore is a pellet ore with increased magnesium content and no increase of binary alkalinity, the high-temperature metallurgical performance of the pellet ore is obviously improved by the mutual cooperation of all raw materials in a specific proportion, and the reduction degree of the pellet ore is increased by 6-8 percent compared with that of the common acid pellet ore; the high-temperature refractoriness under load is increased by 90 plus or minus 5 ℃, and the softening range is reduced by 100 plus or minus 5 ℃.
2. The magnesium flux adopted by the high-magnesium internal combustion acid pellet ore is high-magnesium powder, the high-magnesium powder has higher magnesium content and can play an effective magnesium increasing effect, the calcium content of the high-magnesium powder is lower, the binary alkalinity of blast furnace slag and the addition amount of sinter ore cannot be influenced, and in addition, the high-magnesium powder has high magnesium oxide content and small addition amount, so that the burst rate in the green pellet drying process can be reduced.
3. The gas ash adopted by the high-magnesium internal combustion acid pellet ore of the invention is because the production of magnesium pellets requires more heat energy than the production of common acid pellet ore, so that the temperature of a combustion chamber of a shaft furnace needs to be increased, but the over-high temperature of the fuel chamber can not only easily cause drying and bursting of green pellets, but also easily cause powder in the furnace to agglomerate. Therefore, a small amount of gas ash is added in the material preparation process, so that the carbon contained in the gas ash is directly oxidized and released heat in the roasting process, the roasting air temperature is not required to be excessively increased in a combustion chamber, and the porosity of the pellet is increased due to carbon combustion, so that the reduction degree of the pellet is improved.
4. The high-magnesium internal combustion acid pellet is a pellet with increased magnesium content and without increased binary alkalinity, and the addition of the pellet in a blast furnace can improve the magnesium oxide content in blast furnace slag without affecting the binary alkalinity of the slag, thereby being beneficial to the alkali discharge of the blast furnace slag. The high-magnesium internal-combustion acid pellet ore and the high-alkalinity sinter ore are matched for use, so that the thickness of a reflow zone in the blast furnace can be reduced, the reflow zone moves downwards, the ventilation property of a lump ore zone area in the blast furnace is favorably expanded, the indirect reduction amount is improved, and the coke reduction of the blast furnace is favorably realized.
Detailed Description
The present invention will be described in detail below with reference to specific examples.
Example 1
A high-magnesium internal combustion acid pellet ore comprises the following components in percentage by weight: 95.0% of magnetite concentrate, 1.2% of high-magnesium powder, 1.8% of bentonite and 2.0% of gas ash. Wherein the magnetite concentrate contains 62.0 percent of iron, 23.0 percent of ferrous iron, 7.0 percent of silicon dioxide and 80 percent of magnetite concentrate with the granularity of 200 meshes; the magnesium content of the high-magnesium powder is 90 percent, and the granularity is 91.5 percent of 200 meshes; the carbon content in the gas ash is 30.0 percent, and the granularity is 90 percent of 200 meshes.
The preparation method comprises the following steps:
(1) weighing and uniformly mixing the magnetite concentrate, the high magnesium powder, the gas ash and the bentonite according to a proportion to obtain a mixed dry material;
(2) adding the mixed dry material into a pelletizing disc to pre-add water to obtain a mixed wet material, wherein the pre-added water amount of the mixed wet material is 2-2.5% lower than the total added water amount;
(3) starting a balling disk and adjusting the frequency of a variable-frequency speed regulator of the balling disk to 10Hz, taking a mixed wet material to make a mother ball, then spraying water while adding the mixed wet material until a green ball grows up, adjusting the frequency of the variable-frequency speed regulator of the balling disk to 15Hz, and stopping balling after compacting for 2 minutes;
(4) and (3) sending the green pellets to a pellet roasting furnace for drying, preheating, roasting, soaking and cooling in sequence to obtain the finished product of the high-magnesium internal combustion acid pellet ore. Wherein the temperature is gradually increased to 650 ℃ from 200 ℃ during drying, and the drying time is 6 minutes; the temperature is gradually increased from 650 ℃ to 1100 ℃ during preheating, and the preheating time is 15 minutes; the temperature is gradually increased from 1100 ℃ to 1300 ℃ during roasting, and the roasting time is 18 minutes; the temperature is gradually reduced from 1300 ℃ to 1100 ℃ during soaking, and the soaking time is 15 minutes; the temperature is gradually cooled from 1100 ℃ to 250 ℃ during cooling, the early-stage slow cooling and the later-stage fast cooling are carried out, and the total cooling time is 40 minutes.
The performance of the high-magnesium internal combustion acid pellet: compressive strength: 2150N; reduction degree: 73.5 percent; binary basicity: 0.21; load start temperature: 1165 deg.C; softening interval: at 75 ℃.
Example 2
A high-magnesium internal combustion acid pellet ore comprises the following components in percentage by weight: 93.5% of magnetite concentrate, 1.5% of high-magnesium powder, 2.0% of bentonite and 3% of gas ash. Wherein, the magnetite concentrate contains 63.3 percent of iron, 24.2 percent of ferrous iron and 6.7 percent of silicon dioxide, and the particle size is-200 meshes: 80.0% magnetite concentrate; the magnesium content of the high-magnesium powder is 89.5 percent, and the granularity is 92 percent of 200 meshes; the carbon content in the gas ash is 30 percent, and the granularity is-200 meshes and 90 percent.
The preparation method comprises the following steps:
(1) weighing and uniformly mixing the magnetite concentrate, the high magnesium powder, the gas ash and the bentonite according to a proportion to obtain a mixed dry material;
(2) adding the mixed dry material into a pelletizing disc to pre-add water to obtain a mixed wet material, wherein the pre-added water amount of the mixed wet material is 2-2.5% lower than the total added water amount;
(3) starting a balling disk and adjusting the frequency of a variable-frequency speed regulator of the balling disk to 10Hz, taking a mixed wet material to make a mother ball, then spraying water while adding the mixed wet material until a green ball grows up, adjusting the frequency of the variable-frequency speed regulator of the balling disk to 15Hz, and stopping balling after compacting for 2 minutes;
(4) and (3) sending the green pellets to a pellet roasting furnace for drying, preheating, roasting, soaking and cooling in sequence to obtain the finished product of the high-magnesium internal combustion acid pellet ore. Wherein the temperature is gradually increased to 650 ℃ from 200 ℃ during drying, and the drying time is 6 minutes; the temperature is gradually increased from 650 ℃ to 1100 ℃ during preheating, and the preheating time is 15 minutes; the temperature is gradually increased from 1100 ℃ to 1300 ℃ during roasting, and the roasting time is 18 minutes; the temperature is gradually reduced from 1300 ℃ to 1100 ℃ during soaking, and the soaking time is 15 minutes; the temperature is gradually cooled from 1100 ℃ to 250 ℃ during cooling, the early-stage slow cooling and the later-stage fast cooling are carried out, and the total cooling time is 40 minutes.
The performance of the high-magnesium internal combustion acid pellet: compressive strength: 2020N; reduction degree: 75.0 percent; binary basicity: 0.23; load start temperature: 1172 deg.C; softening interval: 68 ℃.
Claims (6)
1. A high-magnesium internal-combustion acid pellet ore is prepared from the following raw materials by the following method:
the raw materials are proportioned as follows by weight percent:
93-95% of magnetite concentrate, 1.2-1.5% of high-magnesium powder, 1.8-2.5% of bentonite and 2-3% of gas ash;
the preparation method comprises the following steps:
(1) weighing and uniformly mixing the magnetite concentrate, the high magnesium powder, the gas ash and the bentonite according to a proportion to obtain a mixed dry material;
(2) adding the mixed dry material into a pelletizing disc to pre-add water to obtain a mixed wet material, wherein the pre-added water amount of the mixed wet material is 2-2.5% lower than the total added water amount;
(3) starting a balling disk and adjusting the frequency of a variable-frequency speed regulator of the balling disk to 10Hz, taking a mixed wet material to make a mother ball, then spraying water while adding the mixed wet material until a green ball grows up, adjusting the frequency of the variable-frequency speed regulator of the balling disk to 15Hz, and stopping balling after compacting for 2 minutes;
(4) and (3) sending the green pellets to a pellet roasting furnace for drying, preheating, roasting, soaking and cooling in sequence to obtain the finished product of the high-magnesium internal combustion acid pellet ore.
2. The high-magnesium internal combustion acid pellet as claimed in claim 1, wherein: the magnetite concentrate is magnetite concentrate with iron content more than or equal to 62.0%, ferrous content 22.0-25.0%, silicon dioxide less than or equal to 7%, and granularity-200 meshes more than or equal to 80.0%.
3. The high-magnesium internal combustion acid pellet as claimed in claim 1, wherein: the content of magnesium oxide in the high-magnesium powder is more than or equal to 87 percent, and the granularity of 200 meshes is more than or equal to 90 percent.
4. The high-magnesium internal combustion acid pellet as claimed in claim 1, wherein: the carbon content in the gas ash is more than or equal to 30 percent, and the granularity of 200 meshes is more than or equal to 90 percent.
5. The high-magnesium internal combustion acid pellet as claimed in claim 1, wherein: the iron content of the finished high-magnesium internal-combustion acid pellet ore is more than or equal to 61.0 percent, the ferrous content is less than or equal to 1.0 percent, and the magnesium oxide content is 2.1-2.5 percent; the binary alkalinity is 0.2-0.25 times, and the compressive strength is more than or equal to 2000N.
6. The high-magnesium internal combustion acid pellet as claimed in claim 1, wherein: in the step (4), the temperature is gradually increased to 650 +/-10 ℃ from 200 +/-5 ℃ during drying, and the drying time is 6 minutes; gradually raising the temperature from 650 +/-10 ℃ to 1100 +/-10 ℃ during preheating, wherein the preheating time is 15 minutes; the temperature is gradually increased from 1100 ℃ to 1300 +/-10 ℃ during roasting, and the roasting time is 18 minutes; the temperature is gradually reduced from 1300 +/-10 ℃ to 1100 +/-10 ℃ during soaking, and the soaking time is 15 minutes; the temperature is gradually cooled from 1100 ℃ to 250 ℃ during cooling, the early-stage slow cooling and the later-stage fast cooling are carried out, and the total cooling time is 40 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011034008.1A CN112159896A (en) | 2020-09-27 | 2020-09-27 | High-magnesium internal combustion acid pellet ore |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011034008.1A CN112159896A (en) | 2020-09-27 | 2020-09-27 | High-magnesium internal combustion acid pellet ore |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5669328A (en) * | 1979-11-10 | 1981-06-10 | Yoshiro Wakimura | Manufacture of iron manufacturing pellet |
| CN101550484A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | Acidic magnesium oxide pellet and preparation method thereof |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical-strength carbon-containing pellet for blast furnace and production method thereof |
| CN102766763A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Manufacturing method of magnesian pellets |
| CN107130070A (en) * | 2017-04-27 | 2017-09-05 | 酒泉钢铁(集团)有限责任公司 | A kind of calcium-magnesium-containing pellet and preparation method thereof |
| CN107841620A (en) * | 2017-10-25 | 2018-03-27 | 河钢股份有限公司 | A kind of magnesia iron ore pellets preparation method of low titanium |
| CN110229960A (en) * | 2019-07-02 | 2019-09-13 | 中南大学 | A kind of method that coarse grain iron-stone prepares magnesium-containing pellets |
-
2020
- 2020-09-27 CN CN202011034008.1A patent/CN112159896A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5669328A (en) * | 1979-11-10 | 1981-06-10 | Yoshiro Wakimura | Manufacture of iron manufacturing pellet |
| CN101550484A (en) * | 2008-03-31 | 2009-10-07 | 鞍钢股份有限公司 | Acidic magnesium oxide pellet and preparation method thereof |
| CN102102147A (en) * | 2009-12-17 | 2011-06-22 | 鞍钢集团矿业公司 | Process for producing magnesium pellet by grate rotary kiln |
| CN102409170A (en) * | 2010-09-20 | 2012-04-11 | 鞍钢股份有限公司 | High-mechanical-strength carbon-containing pellet for blast furnace and production method thereof |
| CN102766763A (en) * | 2012-08-01 | 2012-11-07 | 山西太钢不锈钢股份有限公司 | Manufacturing method of magnesian pellets |
| CN107130070A (en) * | 2017-04-27 | 2017-09-05 | 酒泉钢铁(集团)有限责任公司 | A kind of calcium-magnesium-containing pellet and preparation method thereof |
| CN107841620A (en) * | 2017-10-25 | 2018-03-27 | 河钢股份有限公司 | A kind of magnesia iron ore pellets preparation method of low titanium |
| CN110229960A (en) * | 2019-07-02 | 2019-09-13 | 中南大学 | A kind of method that coarse grain iron-stone prepares magnesium-containing pellets |
Non-Patent Citations (1)
| Title |
|---|
| 何绪文 等: "《矿井水处理及资源化的理论与实践》", 30 June 2009, 北京 煤炭工业出版社 * |
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Application publication date: 20210101 |