CN103572044A - Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder - Google Patents
Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder Download PDFInfo
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- CN103572044A CN103572044A CN201310475041.1A CN201310475041A CN103572044A CN 103572044 A CN103572044 A CN 103572044A CN 201310475041 A CN201310475041 A CN 201310475041A CN 103572044 A CN103572044 A CN 103572044A
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Abstract
The invention provides a method for producing iron hot-pressed carbon-containing pellets through direct reduction on metallized iron powder. The method for producing the iron hot-pressed carbon-containing pellets through the direct reduction on the metallized iron powder comprises the following steps: adding direct reduction iron powder with metallization ratio about 90% into equipment, such as a blast furnace to be utilized, manufacturing the metallized iron powder into pellets with a certain metallurgical performance before use, according to the caking property of coal and the characteristic related to temperature of the coal, mixing the metallized iron powder with coal dust in a certain proportion and then carrying out hot pressing at the temperature about 450 DEG C, so that the coal and metalized iron powder particles are fully contacted and caked, and a heat treatment technique at the temperature about 700 DEG C is adopted for improving strength of the iron hot-pressed carbon-containing pellets, so that the produced iron hot-pressed carbon-containing pellets have good compressive strength and metallurgical performance.
Description
Technical field
The invention belongs to ferrous metallurgy field, relate to a kind of production method of carbonaceous pelletizing, relate in particular to a kind of method of utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette, be widely used in the equipment such as blast furnace, electric furnace, cupola furnace.
Background technology
In the device fabrications such as blast furnace, for the basic demand of raw material, be to there is certain ultimate compression strength.At present, the production of domestic irony Carbon Composite Iron Ore Hot Briquette mainly be take high-grade iron ore concentrate as raw material, and its main production method has two kinds of cold-bonded carbonic pellet and Carbon Composite Iron Ore Hot Briquettes.(1) cold bound pellet is mainly used in direct-reduction or smelting reduction process, it is with addition of a certain proportion of reductive agent and binding agent by iron ore concentrate, in mixing, by pelletizer pelletizing or ball press, suppress the pelletizing forming, therefore, cold bound pellet is the mixture of iron ore concentrate and reductive agent and binding agent.Although cold bound pellet has good ultimate compression strength at normal temperatures, but this production method relates to the use of binding agent mostly, binding agent has not only increased production cost adding in pelletizing, and the binding agent in pelletizing is easily lost viscosifying power during high temperature, when this carbonaceous pelletizing joins after the equipment such as blast furnace, the quantity of slag that can cause on the one hand smelting equipment increases, on the other hand because binding agent in pelletizing loses viscosity above at 600 ℃, the ultimate compression strength of pelletizing is reduced, thereby limited a large amount of uses of cold bound pellet.(2) Carbon Composite Iron Ore Hot Briquette main application is at home the hot pressing product of iron fine powder and coal dust, it is that iron ore concentrate and coal dust mixing post-heating are arrived to certain temperature, utilize plastic mass (tar) that coal dust adds heat evolution as binding agent, and the Carbon Composite Iron Ore Hot Briquette that compacting forms under certain pressure.Be generally the intensity that improves Carbon Composite Iron Ore Hot Briquette, adopted the thermal treatment of 750 ℃ of left and right.When adopting in this way the Carbon Composite Iron Ore Hot Briquette of producing and add the metallurgical equipments such as the equipment such as blast furnace to use, pelletizing is inner can produce autoreduction in the time of 900～1100 ℃, and generation a large amount of " hole ", its strength decreased and reductibility are improved, be the high temperature metallurgical properties variation of pelletizing, this will cause yield reducation and the energy consumption of the metallurgical equipments such as blast furnace to raise.
Summary of the invention
The object of the invention is in prior art, to have the defects such as the poor yield reducation that causes the metallurgical equipments such as blast furnace of carbonaceous pelletizing intensity low and high temperature metallurgical performance and energy consumption rising in order to overcome, a kind of method of utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette is provided, meets the demand of the metallurgical equipments such as blast furnace.
Object of the present invention can realize in the following manner:
Utilize the method for direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette, after the metallization iron powder of direct-reduction, coal dust are mixed, be heated to 400～500 ℃, after reduction 8～10min, carry out pressure ball, it is 8～20mm that pelletizing granularity is controlled, pelletizing is heated to 650～750 ℃ again, reduces 8～10min, make irony Carbon Composite Iron Ore Hot Briquette;
The weight ratio of described metallization iron powder, coal dust is 70:30～75:25.
After the metallization iron powder of direct-reduction, coal dust are mixed, then add the water glass of metallization iron powder and coal dust gross weight 0.5%～1%.
Described pressure ball is to carry out under the pressure of 30～35Mpa.
Described metallization iron powder degree of metalization is 85～95%, and granularity is-200 orders 40～60%, and iron grade is greater than 80%, and water content is less than 3%.
Described coal dust index of cementation is greater than 1.5, and plastic mass thermostability is 140 ℃, and fixed carbon content is greater than 60%, and granularity is 0.1～1mm.The heating installation adopting is process furnace, batch-type furnace, shaft furnace, rotary kiln, tunnel furnace.
The irony Carbon Composite Iron Ore Hot Briquette that the described method of utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette is produced can be applicable to blast furnace, electric furnace, cupola equipment.
Because the ultimate compression strength of pelletizing is relevant with factors such as plastic mass (tar) content and tonnages in hot pressing temperature, coal, adopt the better coal of cohesiveness, carbon in coal invades in the space of ferrous powder granules or covers on the surface of particle, can make direct-reduction metallization iron powder fully contact with coal dust, and make whole process not need to add binding agent, just can guarantee the intensity of irony Carbon Composite Iron Ore Hot Briquette; And by suitably improving pressure, can reach combining closely of metallization iron powder and coal dust, thereby make the irony Carbon Composite Iron Ore Hot Briquette of producing there is good ultimate compression strength and metallurgical performance.
The present invention compared with prior art has the following advantages:
1, the irony Carbon Composite Iron Ore Hot Briquette that the present invention produces, its technical indicator is: normal temperature ultimate compression strength >=1500N/ ball, tumbler index >=86%, rate of expansion < 20%; Compare and improve with ultimate compression strength >=1200N/ ball of iron fine powder Carbon Composite Iron Ore Hot Briquette;
The production of the irony Carbon Composite Iron Ore Hot Briquette that 2, the present invention produces can be used common coal, and irony hot pressing simultaneously, containing pelletizing after joining the equipment such as blast furnace, can reduce the coke consumption in smelting process, can make coke ratio 105 kg/t that decline, and production capacity can improve 6-8%;
3, the irony Carbon Composite Iron Ore Hot Briquette that the present invention produces is compared with agglomerate process energy consumption, because its high technology temperature is 700 ℃ of left and right, and the technological temperature that agglomerate is produced is 1100～1200 ℃, the technological temperature of irony Carbon Composite Iron Ore Hot Briquette reduces can save certain process energy consumption;
4, the irony Carbon Composite Iron Ore Hot Briquette that the present invention produces does not need to add binding agent, compares with other carbonaceous pelletizings, and irony Carbon Composite Iron Ore Hot Briquette has that feed grade is high, slagging rate is low, intensity is high, good thermal conduction and the advantage such as reductibility is strong.
Embodiment
Embodiment mono-
1, metallization iron powder selects
In the production of irony Carbon Composite Iron Ore Hot Briquette, using its degree of metalization of direct-reduction iron powder is 90%, and granularity is-200 orders 60%.
2, coal selects
The caking coal that coal selects index of cementation to be greater than 1.5, the plastic mass thermostability of coal is 140 ℃, and in coal, fixed carbon content is being on 65%, and size range is 0.2mm.
3, the mixing of material
Water content is less than 3% metallization iron powder and coal dust and prepares burden according to 75:25, and the material preparing should stir.
4, the preheating of mixture
Mixture is sent in heating installation, under the effect of furnace high-temperature, makes the temperature of mixture be elevated to 450 ℃.
5, the insulation of mixture
At the temperature of mixture 450 ℃ of left and right in stove, be incubated after 10min, in stove, take out.
6, the hot pressing of mixture
Mixture after heating should carry out rapidly hot pressing balling-up for reducing temperature drop, and its palletizing pressure is controlled as 35Mpa, and it is 8～20mm that pelletizing granularity is controlled.
7, the thermal treatment of hot pressing pelletizing
Irony carbonaceous pelletizing after hot pressing, its cold strength is lower, should carry out high-temperature heat treatment, and its technique is that irony Carbon Composite Iron Ore Hot Briquette is put in heating installation again, and be incubated 10min after being heated to 700 ℃, can obtain meeting the irony Carbon Composite Iron Ore Hot Briquette of the equipment service requirementss such as blast furnace.
Technical indicator is: 1800N/ ball of normal temperature ultimate compression strength, tumbler index 90%, rate of expansion 10%.
Embodiment bis-
1, metallization iron powder selects
In the production of irony Carbon Composite Iron Ore Hot Briquette, using its degree of metalization of direct-reduction iron powder is 90%, and granularity is-200 orders 65%.
2, coal selects
The caking coal that coal selects index of cementation to be greater than 1.5, the plastic mass thermostability of coal is 140 ℃, and in coal, fixed carbon content is being on 65%, and size range is 0.25mm.
3, the mixing of material
Water content is less than 3% metallization iron powder and coal dust and prepares burden according to 70:30, then adds the water glass of metallization iron powder and coal dust gross weight 0.8%, and the material preparing should stir.
4, the preheating of mixture
Mixture is sent in heating installation, under the effect of furnace high-temperature, makes the temperature of mixture be elevated to 450 ℃.
5, the insulation of mixture
At the temperature of mixture 450 ℃ of left and right in stove, be incubated after 10min, in stove, take out.
6, the hot pressing of mixture
Mixture after heating should carry out rapidly hot pressing balling-up for reducing temperature drop, and its palletizing pressure is controlled as 35Mpa, and it is 8～20mm that pelletizing granularity is controlled.
7, the thermal treatment of hot pressing pelletizing
Irony carbonaceous pelletizing after hot pressing, its cold strength is lower, should carry out high-temperature heat treatment, and its technique is that irony Carbon Composite Iron Ore Hot Briquette is put in heating installation again, and be incubated 10min after being heated to 700 ℃, can obtain meeting the irony Carbon Composite Iron Ore Hot Briquette of the equipment service requirementss such as blast furnace.
Technical indicator is: 1780N/ ball of normal temperature ultimate compression strength, tumbler index 90%, rate of expansion 15%.
The heating installation adopting can be process furnace, batch-type furnace, shaft furnace, rotary kiln, tunnel furnace etc.
Utilize the irony Carbon Composite Iron Ore Hot Briquette of the method production of direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette to can be applicable to the equipment such as blast furnace, electric furnace, cupola furnace.
Claims (5)
1. utilize the method for direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette, after the metallization iron powder of direct-reduction, coal dust are mixed, be heated to 400～500 ℃, after reduction 8～10min, carry out pressure ball, it is 8～20mm that pelletizing granularity is controlled, pelletizing is heated to 650～750 ℃ again, reduces 8～10min, make irony Carbon Composite Iron Ore Hot Briquette;
The weight ratio of described metallization iron powder, coal dust is 70:30～75:25.
2. the method for utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette as claimed in claim 1, it is characterized in that: after the metallization iron powder of direct-reduction, coal dust are mixed, then add the water glass of metallization iron powder and coal dust gross weight 0.5%～1%.
3. the method for utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette as claimed in claim 1, is characterized in that: described pressure ball is to carry out under the pressure of 30～35Mpa.
4. the method for utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette as claimed in claim 1, it is characterized in that: described metallization iron powder degree of metalization is 85～95%, granularity is-200 orders 40～60%, and iron grade is greater than 80%, and water content is less than 3%.
5. the method for utilizing direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette as claimed in claim 1, it is characterized in that: described coal dust index of cementation is greater than 1.5, plastic mass thermostability is 140 ℃, and fixed carbon content is greater than 60%, and granularity is 0.1～1mm.
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| CN103572044B CN103572044B (en) | 2015-03-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975170A (en) * | 2015-06-10 | 2015-10-14 | 甘肃三新硅业有限公司 | Fine iron ore concentrate pelletizing method free of binders |
| CN106676287A (en) * | 2017-01-12 | 2017-05-17 | 中冶东方工程技术有限公司 | Boron slurry utilization method |
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN112575182A (en) * | 2020-11-24 | 2021-03-30 | 东北大学 | Carbon-containing red mud pellets and preparation method thereof |
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| CN1249350A (en) * | 1998-09-28 | 2000-04-05 | 冶金工业部北京冶金设备研究院 | Technology for directly reducing iron with coal base in pot furnace |
| CN101003852A (en) * | 2007-01-18 | 2007-07-25 | 东北大学 | Method for preparing hot pressed balls of iron ore concentrate and powdered coal |
| CN101586172A (en) * | 2009-07-06 | 2009-11-25 | 何德武 | Method for preparing metallized pellet and reduced iron powder |
| CN101724727A (en) * | 2009-09-28 | 2010-06-09 | 莱芜钢铁集团有限公司 | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources |
| CN103290159A (en) * | 2013-06-06 | 2013-09-11 | 昆明钢铁集团有限责任公司 | Method for producing directly-reduced iron powder in microwave heating manner |
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2013
- 2013-10-12 CN CN201310475041.1A patent/CN103572044B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1249350A (en) * | 1998-09-28 | 2000-04-05 | 冶金工业部北京冶金设备研究院 | Technology for directly reducing iron with coal base in pot furnace |
| CN101003852A (en) * | 2007-01-18 | 2007-07-25 | 东北大学 | Method for preparing hot pressed balls of iron ore concentrate and powdered coal |
| CN101586172A (en) * | 2009-07-06 | 2009-11-25 | 何德武 | Method for preparing metallized pellet and reduced iron powder |
| CN101724727A (en) * | 2009-09-28 | 2010-06-09 | 莱芜钢铁集团有限公司 | Short-flow rotary hearth furnace continuous steelmaking method comprehensively utilizing resources |
| CN103290159A (en) * | 2013-06-06 | 2013-09-11 | 昆明钢铁集团有限责任公司 | Method for producing directly-reduced iron powder in microwave heating manner |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975170A (en) * | 2015-06-10 | 2015-10-14 | 甘肃三新硅业有限公司 | Fine iron ore concentrate pelletizing method free of binders |
| CN106676287A (en) * | 2017-01-12 | 2017-05-17 | 中冶东方工程技术有限公司 | Boron slurry utilization method |
| CN112575182A (en) * | 2020-11-24 | 2021-03-30 | 东北大学 | Carbon-containing red mud pellets and preparation method thereof |
| CN112410540A (en) * | 2020-11-27 | 2021-02-26 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
| CN112410540B (en) * | 2020-11-27 | 2023-01-31 | 山西太钢不锈钢股份有限公司 | Preparation method of magnesium pellet and magnesium pellet |
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| CN103572044B (en) | 2015-03-04 |
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