CN102653804A - Method for producing granular iron by magnetically roasting and reducing low-quality limonite with rotary hearth furnace - Google Patents

Method for producing granular iron by magnetically roasting and reducing low-quality limonite with rotary hearth furnace Download PDF

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Publication number
CN102653804A
CN102653804A CN2012101532410A CN201210153241A CN102653804A CN 102653804 A CN102653804 A CN 102653804A CN 2012101532410 A CN2012101532410 A CN 2012101532410A CN 201210153241 A CN201210153241 A CN 201210153241A CN 102653804 A CN102653804 A CN 102653804A
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China
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limonite
hearth furnace
rotary hearth
roasting
magnetic
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CN2012101532410A
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Inventor
高建军
齐渊洪
郭玉华
严定鎏
周和敏
徐洪军
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Central Iron and Steel Research Institute
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Central Iron and Steel Research Institute
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Priority to CN2012101532410A priority Critical patent/CN102653804A/en
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Abstract

The invention provides a method for producing granular iron by magnetically roasting and reducing low-quality limonite with a rotary hearth furnace. The method comprises the following steps of: carrying out reduction roasting, fine grinding and magnetic concentration on limonite; adding carbonaceous reducing agents, compound additives and binders to concentrated ore after magnetic concentration and mixing the materials uniformly; then preparing pellets with pelleting equipment and drying the pellets; and carrying out quick reduction by adopting the rotary hearth furnace, and carrying out cooling, grinding and magnetic separation with a magnetic separator so as to obtain the granular iron, wherein the reducing agents for reduction roasting of limonite are flue gases generated by the rotary hearth furnace. The method has the advantages of high degree of automation, high reaction speed, high reduction efficiency, low smelting cost and the like.

Description

A kind of low-quality limonite magnetizing roasting rotary hearth furnace reduction is produced the method for granulated iron
Technical field
The present invention relates to field of metallurgy, relate more specifically to the method that a kind of low-quality limonite rotary hearth furnace is directly gone back original production granulated iron.
Background technology
Limonite is mainly formed physics and unstable chemcial property by limonite and a small amount of rhombohedral iron ore and clay mineral.The limonite overwhelming majority of occurring in nature is with 2Fe 2O 33H 2The O form exists, and its theoretical iron-holder is 59.8%.Because it contains a large amount of crystal water, about 8~15%, and its springy texture, density is little, and water cut is big, and pore is many, so after temperature rising crystal water removes, stay new pore again.The brown iron ore grade of China is merely about 40%, except 2Fe 2O 33H 2Outside the O, also contain a large amount of SiO 2Deng the gangue oxide compound, belong to acid iron ore.In the blast furnace ironmaking process, need to add flux slag making such as a large amount of Wingdales and rhombspar, cause the blast-furnace smelting energy consumption high, utilization coefficient is low, and is not easy to operate.
The main mode of utilizing of limonite is through after the ore dressing at present, and brown iron ore concentrate with the fine iron breeze sintering, supplies blast furnace ironmaking to use as sintered material.For of high grade, the limonite that gangue content is few can not carry out ore dressing, directly is used for SINTERING PRODUCTION.But China's brown iron ore grade is lower, and acid gangue content is high, need carry out beneficiation enrichment.Chemical ingredients is fixing because limonite has, iron-holder is very unstable, moisture content change is big, the easy mistake pulverized in the fine grinding process; And there is not magnetic; So utilize the method for physical concentration to be difficult to the enrichment of iron grade, and magnetizing roasting is the effective ways of limonite enrichment to very high.But during limonite high mixture ratio sintering, it is slow to have a sintering velocity, and productivity of sinter is low, agglomerate tissue looseness, yield rate is low and shortcoming such as burnup height.The shortcoming that limonite sintering is produced has seriously hindered the production of blast-furnace smelting limonite.On the one hand China is in a large number from external imported iron ore stone, and a large amount of low-quality limonite resources of China are not used on the other hand, opens up a low-quality limonite and utilizes new way so press for.
Rotary hearth furnace is as a kind of new direct reduction iron making method, have raw material and fuel quality is required low, characteristics such as smelting speed is fast, and is simple to operate, however present rotary hearth furnace smeltings needs to solve the problem of the efficient utilization of high-temperature flue gas.
Summary of the invention
The purpose of this invention is to provide the method that a kind of low-quality limonite magnetizing roasting rotary hearth furnace reduction is produced granulated iron, have characteristics such as technical process is short, crude fuel flexibility is strong, the reaction times is fast, the PT is short, production efficiency is high, iron yield is high, the granulated iron cost is low, simple to operate, easy control automatically.In addition, method of the present invention in process of production, required energy consumption is provided by coal more than 90%, it is little that power current consumes, and just can obtain qualified cheaply granulated iron through simple production process.
According to embodiments of the invention, the method that a kind of low-quality limonite magnetizing roasting rotary hearth furnace reduction is produced granulated iron comprises the steps: limonite is carried out reducing roasting, fine grinding and magnetic concentration; Enrichment ore deposit behind magnetic concentration adds carbonaceous reducing agent, composite additive and sticker and mixes; Process pelletizing with system ball equipment then, and dry; Adopt rotary hearth furnace to carry out fast restore, and obtain granulated iron through the overcooling fragmentation and after with the magnetic separator magnetic separation, wherein, the used reductive agent of limonite reducing roasting is the flue gas that rotary hearth furnace produces.
Said carbonaceous reducing agent can be selected from least a in pitch coke, charcoal and the hard coal, and said composite additive can be unslaked lime and fluorite, and said sticker can be selected from least a in pitch and the syrup.
Said system ball equipment can be pair roller ball press or balling disc.
The reducing roasting temperature of the flue gas that said rotary hearth furnace produces can be about 600 ℃ to about 1000 ℃, in the smoke components volume content of CO about 1% to about 20% scope.
Can the roasted ore that obtain after the limonite reducing roasting be finely ground to below about 30 orders.
Said carbonaceous reducing agent can be about 10% to about 30% of the weight in the enrichment ore deposit behind the magnetic concentration; Said composite additive can for the weight in the enrichment ore deposit behind the magnetic concentration about 5% to about 25%, said sticker can be about 2% to about 10% of the weight in the enrichment ore deposit behind the magnetic concentration.
The diameter of said pelletizing can be for approximately 10mm be to about 40mm, and drying temperature can be about 200 ℃ to about 400 ℃, and can be about 1 hour to about 3 hours time of drying.The reduction temperature of rotary hearth furnace is 1250 ℃ to 1450 ℃, and the recovery time is 20 minutes to 50 minutes.
The magneticstrength of said magnetic separator is 1000 Gauss to 5000 Gausses.
Advantages such as the method that low-quality limonite magnetizing roasting rotary hearth furnace reduction provided by the invention is produced granulated iron has the level of automation height, speed of response is fast, the recovery time is short, reduction efficiency is high, iron loss is few in the reduction process, smelting cost is low.In addition, adopt rotary hearth furnace directly to reduce and need not consume coking coal resource, fuel consumption is low, and the granulated iron that obtains can replace steel scrap, utilizes for low-quality limonite is efficient and has opened up a new way.
Description of drawings
Fig. 1 is a process flow sheet of producing the method for granulated iron according to the low-quality limonite magnetizing roasting rotary hearth furnace reduction of the embodiment of the invention.
Embodiment
To describe with reference to the method that Fig. 1 produces granulated iron to low-quality limonite rotary hearth furnace reduction of the present invention below.As shown in Figure 1, the method that low-quality limonite magnetizing roasting rotary hearth furnace reduction of the present invention is produced granulated iron may further comprise the steps: limonite is carried out reducing roasting, fine grinding and magnetic concentration; Enrichment ore deposit behind magnetic concentration adds carbonaceous reducing agent, composite additive and sticker and mixes; Process pelletizing with system ball equipment then, and dry; Adopt rotary hearth furnace to carry out fast restore, and obtain granulated iron through the overcooling fragmentation and after with the magnetic separator magnetic separation, wherein, the used reductive agent of limonite reducing roasting is the flue gas that rotary hearth furnace produces.
Said carbonaceous reducing agent can be selected from least a in pitch coke, charcoal and the hard coal, and composite additive can be unslaked lime and fluorite, and sticker can be selected from least a in pitch and the syrup.In addition, also can be employed in carbonaceous reducing agent, composite additive and the sticker of other type as known in the art.
Can adopt pair roller ball press or balling disc as system ball equipment.
In the method for the invention, the reducing roasting temperature of the flue gas that rotary hearth furnace produces is about 600 ℃ to about 1000 ℃, and the CO volume content is about 1% to about 20% in the flue gas.
In addition; Carbonaceous reducing agent can be about 10% to about 30% of the weight in the enrichment ore deposit behind the magnetic concentration; Said composite additive can for the weight in the enrichment ore deposit behind the magnetic concentration about 5% to about 25%, said sticker can be about 2% to about 10% of the weight in the enrichment ore deposit behind the magnetic concentration.
After with the limonite reducing roasting and before magnetic concentration, roasted ore is finely ground to below 30 orders.
The diameter of pelletizing can be for approximately 10mm be to about 40mm, and drying temperature can be about 200 ℃ to about 400 ℃, and can be about 1 hour to about 3 hours time of drying.As required, those skilled in the art can process pelletizing has any suitable diameter, under any suitable drying temperature, carries out drying, and dry any suitable time period.
Adopting rotary hearth furnace to carry out in the step of fast restore, the reduction temperature of rotary hearth furnace is about 1250 ℃ to about 1450 ℃, and the recovery time is about 20 minutes to about 50 minutes.
In addition, can select the magneticstrength of magnetic separator is 1000 Gauss to 5000 Gausses.
The method of low-quality limonite magnetizing roasting rotary hearth furnace reduction of the present invention being produced granulated iron below in conjunction with specific embodiment is described in detail.
Embodiment 1
In embodiment 1, the chemical ingredients of limonite is following: TFe (full iron) 40.33%, FeO 0.64%, Fe 2O 356.94%, SiO 216.20%, Al 2O 34.01%, CaO 1.15%, MgO 0.48%, MnO4.62%, Lol (scaling loss) 15.96%.
Utilize the rotary hearth furnace flue gas to carry out reducing roasting in a certain amount of limonite with above-mentioned chemical ingredients; About 1000 ℃ of the reducing roasting temperature of rotary hearth furnace flue gas; The CO volume content about 6% in the flue gas; Roasted ore after the reducing roasting is finely ground to below 30 orders, carries out magnetic concentration then, thereby obtain the enrichment ore deposit.Then; Weight in the enrichment ore deposit behind the magnetic concentration; In the enrichment ore deposit, add about 25% pitch coke as carbonaceous reducing agent, about 27% unslaked lime and fluorite as the syrup of composite additive and about 4% as sticker and mix; Use the pair roller ball press to be pressed into the pelletizing that diameter is 10~40mm, drying is about 2 hours under about 300 ℃.Subsequently, with dried pelletizing fast restore in rotary hearth furnace, 1380 ℃ of reduction temperatures, 30 minutes recovery times, reduzate is after cooling off fragmentation, and magnetic separation obtains granulated iron on about 4000 Gausses' magnetic separator.The result shows that the iron grade is 52.3% after the magnetizing roasting, and MFe in the granulated iron (metallic iron) is 96.41%, and iron recovery is 89%.
Embodiment 2
In embodiment 2, the chemical ingredients of limonite is following: TFe 46.60%, FeO 1.23%, Fe 2O 365.2%, SiO 28.84%, Al 2O 35.97%, CaO 1.29%, MgO 1.71%, MnO 0.89%, Lol (scaling loss) 14.87%.
Utilize the rotary hearth furnace flue gas to carry out reducing roasting in a certain amount of limonite with above-mentioned chemical ingredients; About 900 ℃ of the reducing roasting temperature of rotary hearth furnace flue gas; The CO volume content about 10% in the flue gas; Roasted ore after the reducing roasting is finely ground to below 30 orders, carries out magnetic concentration then, thereby obtains the enrichment ore deposit.Then; Weight in the enrichment ore deposit behind the magnetic concentration; In the enrichment ore deposit, add about 27% charcoal as carbonaceous reducing agent, about 15% unslaked lime and fluorite as the pitch of composite additive and about 6% as sticker and mix; Use the pair roller ball press to be pressed into the pelletizing that diameter is 10~40mm, drying is about 3 hours under about 350 ℃.Subsequently, with dried pelletizing fast restore in rotary hearth furnace, 1450 ℃ of reduction temperatures, 20 minutes recovery times, reduzate is after cooling off fragmentation, and magnetic separation obtains granulated iron on about 3000 Gausses' magnetic separator.The result shows that the iron grade is 54.2% after the magnetizing roasting, and MFe is 96.07% in the granulated iron, and iron recovery is 96%.
Embodiment 3
In embodiment 3, the chemical ingredients of limonite is following: TFe 42.83%, FeO 0.86%, Fe 2O 360.23%, SiO 210.68%, Al 2O 34.53%, CaO 0.79%, MgO 2.13%, MnO 1.56%, Lol 19.22%.
Utilize the rotary hearth furnace flue gas to carry out reducing roasting in a certain amount of limonite with above-mentioned chemical ingredients; About 850 ℃ of rotary hearth furnace flue gas reducing roasting temperature; The CO volume content about 5% in the flue gas; Roasted ore after the reducing roasting is finely ground to below 30 orders, carries out magnetic concentration then, thereby obtain the enrichment ore deposit.Then; Weight in the enrichment ore deposit behind the magnetic concentration; In the enrichment ore deposit, add about 30% hard coal as carbonaceous reducing agent, about 8% unslaked lime and fluorite as the syrup of composite additive and about 10% and pitch as sticker and mix; Use balling disc to be pressed into the pelletizing that diameter is 10~40mm, drying is about 1 hour under about 400 ℃.Subsequently, with dried pelletizing fast restore in rotary hearth furnace, 1250 ℃ of reduction temperatures, 50 minutes recovery times, reduzate is after cooling off fragmentation, and magnetic separation obtains granulated iron on about 5000 Gausses' magnetic separator.The result shows that the iron grade is 50.8% after the magnetizing roasting, and MFe is 96.82% in the granulated iron, and iron recovery is 92%.
Embodiment 4
In embodiment 4, the chemical ingredients of limonite is following: TFe 38.64%, FeO 0.82%, Fe 2O 354.29%, SiO 217.35%, Al 2O 33.69%, CaO 1.06%, MgO 2.68%, MnO 0.95%, Lol 19.16%.
Utilize the rotary hearth furnace flue gas to carry out reducing roasting in a certain amount of limonite with above-mentioned chemical ingredients; About 600 ℃ of rotary hearth furnace flue gas reducing roasting temperature; The CO volume content about 20% in the flue gas; Roasted ore after the reducing roasting is finely ground to below 30 orders, carries out magnetic concentration then, thereby obtains the enrichment ore deposit.Then; Weight in the enrichment ore deposit behind the magnetic concentration; In the enrichment ore deposit, add about 12% charcoal and hard coal as carbonaceous reducing agent, about 25% unslaked lime and fluorite as the syrup of composite additive and about 2% as sticker and mix; Use balling disc to be pressed into the pelletizing that diameter is 10~40mm, drying is about 2.5 hours under about 200 ℃.Subsequently, with dried pelletizing fast restore in rotary hearth furnace, 1300 ℃ of reduction temperatures, 40 minutes recovery times, reduzate is after cooling off fragmentation, and magnetic separation obtains granulated iron on about 1000 Gausses' magnetic separator.The result shows that the iron grade is 53.5% after the magnetizing roasting, and MFe is 96.98% in the granulated iron, and iron recovery is 91%.
In an embodiment of the present invention, the high-temperature flue gas that utilizes rotary hearth furnace to produce carries out the limonite magnetizing roasting, with the Fe in the raw ore 2O 3Be reduced to Fe 3O 4, pass through the method enrichment of magnetic separation then, realized the efficient utilization of low-grade limonite magnetic concentration and rotary hearth furnace flue gas.In actually operating, can control the rotary hearth furnace flue gas through the adjusting air-fuel ratio is reducing atmosphere, satisfies the magnetizing roasting requirement.The rotary hearth furnace flue gas is adjusted to reducing atmosphere; This helps efficiently carrying out of the interior reduction reaction of rotary hearth furnace and stops the reduzate secondary oxidation; Improve reduction efficiency, and then realized the comprehensive utilization of resources of low-quality limonite and the efficient utilization of rotary hearth furnace flue gas.
Visible from embodiment 1 to embodiment 4, the method that low-quality limonite rotary hearth furnace of the present invention is directly gone back original production granulated iron can reach following technico-economical comparison: metallic iron in the product granulated iron (MFe) content is greater than 95%; Iron recovery is greater than 85%.In addition, compared with prior art, method of the present invention has the following advantages: the method that (1) low-quality limonite magnetizing roasting rotary hearth furnace reduction of the present invention is produced granulated iron goes for low-grade limonite raw material, so adaptability to raw material is good.China's brown iron ore grade generally about 40%, acid gangue SiO 2Content is higher, and they all can use the direct method of reducing of rotary hearth furnace of the present invention to produce granulated iron; (2) directly also the method for original production granulated iron is wide to coal adaptability for low-quality limonite rotary hearth furnace of the present invention, and the smelting energy consumption is low.Specifically, the method that limonite magnetizing roasting rotary hearth furnace reduction of the present invention is produced granulated iron does not need valuable coking coal resource, but can utilize the abundant common coal of reserves.Because rotary hearth furnace is smelted the whole utilizations that realized fuel chemical energy, so energy utilization efficiency is high, smelting cost is low; (3) granulated iron that obtains of the present invention can be used as steel scrap, has realized the efficient utilization of low-quality limonite resource.In addition, granulated iron stable components of the present invention, detrimental impurity is few, is fine steel scrap resource, can be used as rotary furnace cooling agent or electrosmelting raw material.In addition, smelt the slag that produces and to produce cement or other material of construction.

Claims (9)

1. the method that low-quality limonite magnetizing roasting rotary hearth furnace reduction is produced granulated iron is characterized in that said method comprises the steps: limonite is carried out reducing roasting, fine grinding and magnetic concentration; Enrichment ore deposit behind magnetic concentration adds carbonaceous reducing agent, composite additive and sticker and mixes; Process pelletizing with system ball equipment then, and dry; Adopt rotary hearth furnace to carry out fast restore, and obtain granulated iron through the overcooling fragmentation and after with the magnetic separator magnetic separation, wherein, the used reductive agent of limonite reducing roasting is the flue gas that rotary hearth furnace produces.
2. method according to claim 1 is characterized in that, said carbonaceous reducing agent is selected from least a in pitch coke, charcoal and the hard coal, and said composite additive is unslaked lime and fluorite, and said sticker is selected from least a in pitch and the syrup.
3. method according to claim 1 is characterized in that, said system ball equipment is pair roller ball press or balling disc.
4. method according to claim 1 is characterized in that, the reducing roasting temperature of the flue gas that said rotary hearth furnace produces is 600 ℃ to 1000 ℃, and the volume content of CO is in 1% to 20% scope in the smoke components.
5. method according to claim 1 is characterized in that, the roasted ore that obtains after the limonite reducing roasting is finely ground to below 30 orders.
6. method according to claim 2; It is characterized in that; Said carbonaceous reducing agent be the enrichment ore deposit behind the magnetic concentration weight 10% to 30%; Said composite additive be the enrichment ore deposit behind the magnetic concentration weight 5% to 25%, said sticker be the enrichment ore deposit behind the magnetic concentration weight 2% to 10%.
7. method according to claim 1 is characterized in that, the diameter of said pelletizing is 10mm to 40mm, and drying temperature is 200 ℃ to 400 ℃, and be 1 hour to 3 hours time of drying.
8. method according to claim 1 is characterized in that, the reduction temperature of rotary hearth furnace is 1250 ℃ to 1450 ℃, and the recovery time is 20 minutes to 50 minutes.
9. method according to claim 1 is characterized in that, the magneticstrength of said magnetic separator is 1000 Gauss to 5000 Gausses.
CN2012101532410A 2012-05-16 2012-05-16 Method for producing granular iron by magnetically roasting and reducing low-quality limonite with rotary hearth furnace Pending CN102653804A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103255284A (en) * 2013-05-27 2013-08-21 南京钢铁股份有限公司 Method for processing and utilizing low-quality iron ore powder
CN103468936A (en) * 2013-08-15 2013-12-25 甘肃酒钢集团宏兴钢铁股份有限公司 Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology
CN103589865A (en) * 2013-10-12 2014-02-19 酒泉钢铁(集团)有限责任公司 Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation
CN106119456A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Prepare the method and system of ferrum
CN106119455A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Process the method and system of red mud
CN106222354A (en) * 2016-09-13 2016-12-14 江苏省冶金设计院有限公司 A kind of system and method utilizing body of heater fume afterheat high efficiente callback iron-containing resource
CN111154972A (en) * 2020-01-21 2020-05-15 鞍钢股份有限公司 Preparation method of spherical granular iron for steelmaking

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CN101020957A (en) * 2006-12-22 2007-08-22 昆明贵金属研究所 Process of fast reducing carbon-containing red mud nickel ore pellet to beneficiate nickel in a bottom rotating furnace
CN101792857A (en) * 2010-04-13 2010-08-04 李柏荣 Process for refining metals from minerals

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Publication number Priority date Publication date Assignee Title
CN101020957A (en) * 2006-12-22 2007-08-22 昆明贵金属研究所 Process of fast reducing carbon-containing red mud nickel ore pellet to beneficiate nickel in a bottom rotating furnace
CN101792857A (en) * 2010-04-13 2010-08-04 李柏荣 Process for refining metals from minerals

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103255284A (en) * 2013-05-27 2013-08-21 南京钢铁股份有限公司 Method for processing and utilizing low-quality iron ore powder
CN103468936A (en) * 2013-08-15 2013-12-25 甘肃酒钢集团宏兴钢铁股份有限公司 Difficult-separation iron ore tailing pelletizing rotary kiln magnetic roasting treatment technology
CN103468936B (en) * 2013-08-15 2015-12-02 甘肃酒钢集团宏兴钢铁股份有限公司 A kind of refractory iron ore mine tailing pelletizing rotary kiln magnetizing roasting treatment process
CN103589865A (en) * 2013-10-12 2014-02-19 酒泉钢铁(集团)有限责任公司 Method for producing metallized pellets by direct reduction of powdered iron by carbon cycle oxygenation
CN106119456A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Prepare the method and system of ferrum
CN106119455A (en) * 2016-08-01 2016-11-16 江苏省冶金设计院有限公司 Process the method and system of red mud
CN106222354A (en) * 2016-09-13 2016-12-14 江苏省冶金设计院有限公司 A kind of system and method utilizing body of heater fume afterheat high efficiente callback iron-containing resource
CN111154972A (en) * 2020-01-21 2020-05-15 鞍钢股份有限公司 Preparation method of spherical granular iron for steelmaking

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Application publication date: 20120905