CN103572044B - 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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- CN103572044B CN103572044B CN201310475041.1A CN201310475041A CN103572044B CN 103572044 B CN103572044 B CN 103572044B CN 201310475041 A CN201310475041 A CN 201310475041A CN 103572044 B CN103572044 B CN 103572044B
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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 field of steel metallurgy, relate to a kind of production method of carbonaceous pelletizing, particularly relate to a kind of method 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, the basic demand for raw material to have certain ultimate compression strength.At present, the production of domestic irony Carbon Composite Iron Ore Hot Briquette mainly with high-grade iron ore concentrate for raw material, its main production process has cold-bonded carbonic pellet and Carbon Composite Iron Ore Hot Briquette two kinds.(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, upon mixing through pelletizer pelletizing or ball press compacting pelletizing, 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 not only increases production cost adding in pelletizing, and binding agent during high temperature in pelletizing easily loses viscosifying power, after this carbonaceous pelletizing joins the equipment such as blast furnace, the quantity of slag of smelting equipment can be caused to increase on the one hand, on the other hand because binding agent in pelletizing loses viscosity more than 600 DEG C, the ultimate compression strength of pelletizing is reduced, thus limits 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 concentrate and coal dust, it is to certain temperature by iron ore concentrate and coal dust mixing post-heating, coal dust is utilized to add the plastic mass (tar) of heat evolution as binding agent, and the Carbon Composite Iron Ore Hot Briquette suppressed under pressure.Be generally the intensity improving Carbon Composite Iron Ore Hot Briquette, have employed the thermal treatment of about 750 DEG C.When adopting the Carbon Composite Iron Ore Hot Briquette produced in this way and adding the metallurgical equipment uses such as the equipment such as blast furnace, pelletizing inside can produce autoreduction 900 ~ 1100 DEG C time, and generate in a large amount of " hole ", its intensity is reduced and reductibility raising, namely the high temperature metallurgical properties of pelletizing is deteriorated, and this will cause the output of the metallurgical equipments such as blast furnace to reduce and energy consumption rising.
Summary of the invention
The object of the invention is to there is carbonaceous pelletizing intensity low and high temperature metallurgical performance difference cause the output of the metallurgical equipments such as blast furnace to reduce and the defect such as energy consumption rising to overcome in prior art, a kind of method 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, by after the metallization iron powder of direct-reduction, coal dust mixing, be heated to 400 ~ 500 DEG C, pressure ball is carried out after reduction 8 ~ 10min, pelletizing Task-size Controlling is 8 ~ 20mm, again pelletizing is heated to 650 ~ 750 DEG C, reduction 8 ~ 10min, obtained 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 mixing, then add the water glass of metallization iron powder and coal dust gross weight 0.5% ~ 1%.
Described pressure ball carries out under the pressure of 30 ~ 35Mpa.
Described metallization ferrous powder metal rate 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 DEG C, and fixed carbon content is greater than 60%, and granularity is 0.1 ~ 1mm.The heating installation adopted is process furnace, batch-type furnace, shaft furnace, rotary kiln, tunnel furnace.
The irony Carbon Composite Iron Ore Hot Briquette that the described method utilizing direct-reduction to metallize 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 factor such as plastic mass (tar) content and tonnage etc. 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, direct-reduction metallization iron powder can be made fully to contact with coal dust, and make whole process not need to add binding agent, just can ensure the intensity of irony Carbon Composite Iron Ore Hot Briquette; And by suitably improving pressure, combining closely of metallization iron powder and coal dust can be reached, thus make the irony Carbon Composite Iron Ore Hot Briquette of production have 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 of the present invention's production, its technical indicator is: normal temperature ultimate compression strength >=1500N/ ball, tumbler index >=86%, rate of expansion < 20%; Improve compared with Iron concentrate Carbon Composite Iron Ore Hot Briquette ultimate compression strength >=1200N/ ball;
2, the production of irony Carbon Composite Iron Ore Hot Briquette that the present invention produces can use common coal, and irony hot pressing is containing pelletizing after joining the equipment such as blast furnace simultaneously, can reduce the coke consumption in smelting process, and coke ratio can be made to decline 105 kg/t, and production capacity can improve 6-8%;
3, the irony Carbon Composite Iron Ore Hot Briquette of the present invention's production is compared with agglomerate process energy consumption, because its most high technology temperature is about 700 DEG C, and the technological temperature that agglomerate is produced is 1100 ~ 1200 DEG C, 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, and compared with other carbonaceous pelletizings, 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 one
1, to metallize the selecting of iron powder
In the production of irony Carbon Composite Iron Ore Hot Briquette, use its degree of metalization of direct-reduction iron powder to be 90%, granularity is-200 orders 60%.
2, the selecting of coal
Coal selects index of cementation to be greater than the caking coal of 1.5, and the plastic mass thermostability of coal is 140 DEG C, and in coal, fixed carbon content is on for 65%, and size range is 0.2mm.
3, the mixing of material
Water content be less than 3% metallization iron powder and coal dust prepare burden according to 75:25, the material prepared 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 DEG C.
5, the insulation of mixture
Mixture takes out be incubated 10min at the temperature of about 450 DEG C in stove after in stove.
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 controls as 35Mpa, and pelletizing Task-size Controlling is 8 ~ 20mm.
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 again put in heating installation by irony Carbon Composite Iron Ore Hot Briquette, and be incubated 10min after being heated to 700 DEG C, the irony Carbon Composite Iron Ore Hot Briquette meeting the equipment use requirements such as blast furnace can be obtained.
Technical indicator is: a normal temperature ultimate compression strength 1800N/ ball, tumbler index 90%, rate of expansion 10%.
Embodiment two
1, to metallize the selecting of iron powder
In the production of irony Carbon Composite Iron Ore Hot Briquette, use its degree of metalization of direct-reduction iron powder to be 90%, granularity is-200 orders 65%.
2, the selecting of coal
Coal selects index of cementation to be greater than the caking coal of 1.5, and the plastic mass thermostability of coal is 140 DEG C, and in coal, fixed carbon content is on for 65%, and size range is 0.25mm.
3, the mixing of material
Water content be less than 3% metallization iron powder and coal dust prepare burden according to 70:30, then add metallization iron powder and the water glass of coal dust gross weight 0.8%, the material prepared 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 DEG C.
5, the insulation of mixture
Mixture takes out be incubated 10min at the temperature of about 450 DEG C in stove after in stove.
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 controls as 35Mpa, and pelletizing Task-size Controlling is 8 ~ 20mm.
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 again put in heating installation by irony Carbon Composite Iron Ore Hot Briquette, and be incubated 10min after being heated to 700 DEG C, the irony Carbon Composite Iron Ore Hot Briquette meeting the equipment use requirements such as blast furnace can be obtained.
Technical indicator is: a normal temperature ultimate compression strength 1780N/ ball, tumbler index 90%, rate of expansion 15%.
The heating installation adopted can be process furnace, batch-type furnace, shaft furnace, rotary kiln, tunnel furnace etc.
The irony Carbon Composite Iron Ore Hot Briquette that the method utilizing direct-reduction to metallize PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette is produced can be applicable to the equipment such as blast furnace, electric furnace, cupola furnace.
Claims (4)
1. utilize the method for direct-reduction metallization PRODUCTION OF IRON POWDER irony Carbon Composite Iron Ore Hot Briquette, by after the metallization iron powder of direct-reduction, coal dust mixing, be heated to 400 ~ 500 DEG C, pressure ball is carried out after reduction 8 ~ 10min, pelletizing Task-size Controlling is 8 ~ 20mm, again pelletizing is heated to 650 ~ 750 DEG C, reduction 8 ~ 10min, obtained irony Carbon Composite Iron Ore Hot Briquette;
The weight ratio of described metallization iron powder, coal dust is 70:30 ~ 75:25;
Described coal dust index of cementation is greater than 1.5, and plastic mass thermostability is 140 DEG C, and fixed carbon content is greater than 60%, and granularity is 0.1 ~ 1mm.
2. utilize the method for 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 mixing, then add the water glass of metallization iron powder and coal dust gross weight 0.5% ~ 1%.
3. utilize the method for 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 pressure ball carries out under the pressure of 30 ~ 35MPa.
4. utilize the method for 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 ferrous powder metal rate is 85 ~ 95%, granularity is-200 orders 40 ~ 60%, and Iron grade is greater than 80%, and water content is less than 3%.
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| CN103572044B true CN103572044B (en) | 2015-03-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN106676287B (en) * | 2017-01-12 | 2018-09-04 | 中冶东方工程技术有限公司 | A kind of utilization method of boron mud |
| CN112575182A (en) * | 2020-11-24 | 2021-03-30 | 东北大学 | Carbon-containing red mud pellets and preparation method thereof |
| 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 |
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 |
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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 |
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