CN103290159A - Method for producing directly-reduced iron powder in microwave heating manner - Google Patents
Method for producing directly-reduced iron powder in microwave heating manner Download PDFInfo
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Abstract
The invention provides a method for producing directly-reduced iron powder in a microwave heating manner. The method comprises the following steps: proportioning raw materials by mass percent: 60% to 73% of iron raw material, 22% to 30% of reducing agent, 3% to 7% of desulfurizing agent and 2% to 3% of bentonite; mixing by adding water, pelletizing and screening, thereby preparing a fresh pellet with the pellet diameter ranging from 10 to 15mm; drying and sending into a microwave heating oven; reducing for 160 to 180 minutes by rising the temperature to 1050 to 1150 DEG C, thereby obtaining a metallized pellet group; crushing and grinding to form fine powder with the granularity less than 0.2mm; and performing magnetic separation on the fine powder, thereby obtaining the directly-reduced iron powder. As the method is used, the defects of the directly-reduced iron production process by utilizing a canned external carbon distributing method through a coal-based tunnel kiln that the reduction time is long, the product quality is difficult to control, the investment is high, the occupied area is large and the like are overcome. The method has the effects that the reduction time is shortened greatly; the human cost is lowered; and the obvious energy conservation and emission reduction effect is realized.
Description
Technical field
The present invention relates to a kind of production method of direct-reduced iron powder, especially a kind of microwave heating reduction of carbonaceous pelletizing prepares the method for reduced iron powder, belongs to the microwave metallurgical technical field.
Background technology
As one of emerging, ground-breaking cutting edge technology, direct-reduced iron be with raw materials such as iron ores under solid conditions, directly be reduced to the cavernous iron product of low-carbon (LC)---the method for sponge iron, this method has been saved operations such as coking, sintering, blast furnace ironmaking, overcome big, the shortcomings such as energy consumption is high, long flow path of blast furnace ironmaking investment, adapt to the trend that modern steel enterprise constantly develops to densification, high efficiency, serialization, noble and unsullied purification and environmentally friendly direction better.The method of direct-reduced iron has good characteristics such as chemical composition stability, foreign matter content is few, harmful element content is low, and adaptability is strong, and demand is big.
Adopt the canned outer carbon method of joining of coal-based tunnel furnace to produce direct-reduced iron at present, have following deficiency: heat because adopting producer gas generator institute producing coal gas (1), and heat is from the material outside, with heat transfer types such as convection current, conduction, radiation, from outward appearance to inner essence transmit, therefore need the long time, be the residence time of material in tunnel furnace to reach 70 hours more than, pre-heating temperature elevation to 1150 ℃ need 12 hours, reduction needs 43 hours, also need simultaneously to heat the body of heater than large space, have long, shortcoming such as energy consumption is high, thermo-efficiency is low of process time.(2) the coal gas heating exists the material temperature distributing disproportionation even, and quality product is difficult to control, and phenomenons such as underburnt, burning easily take place, and brings difficulty of processing to subsequent handling.(3) because building gazogene, so investment is big, floor space is big.Therefore, be badly in need of seeking a kind of fast, energy consumption is low, product performance are stable novel process.
Summary of the invention
The objective of the invention is to overcome the canned outer carbon method of joining of coal-based tunnel furnace and produce above-mentioned all deficiencies that direct-reduced iron exists, provide a kind of microwave heating reduction of carbonaceous pelletizing to prepare the method for reduced iron powder.
The present invention finishes by following technical proposal: the method for direct-reduced iron powder is produced in a kind of microwave heating, carries out according to the following steps:
A, by following mass percent preparation raw material:
Iron material 60～73%
Reductive agent 22～30%
Sweetening agent 3～7%
Wilkinite 2～3%
Summation is 100%;
B, the raw material of steps A is added water through routine mix, make ball, screening, get the green-ball that sphere diameter is 10～15mm;
C, the green-ball of step B is dried to the green-ball water content less than 1% mass ratio through routine;
D, the dry green-ball of step C is sent in the microwave oven, be warming up to 1050～1150 ℃, reduction 160～180min gets metallized pellet;
E, with the metallized pellet of step C through conventional broken, be finely ground to granularity less than the fine powder of 0.2mm;
F, be under the condition of 0.5～1.5A in magnetic separation strength of current, the fine powder of step e is carried out magnetic separation, magnetic separation gets the direct-reduced iron powder.
Iron material in the described steps A is one or both the mixing in oxidation sludge or the iron ore concentrate, and two kinds mixing quality ratio is: oxidation sludge: iron ore concentrate=30～50:50～70, the selection of concrete kind and mix determining of ratio is 65～70% to be advisable with TFe in the iron material.
Described reductive agent is one or both in coke powder or the coal dust, and two kinds mixing quality ratio is arbitrarily.
Described sweetening agent is a kind of in Wingdale or unslaked lime or the light dolomite.
The ball of making of described step B is finished at conventional balling disc, and its main technical details is: diameter Ф=1000mm, rotating speed 40r/min, the high h=150mm in limit, inclination alpha=45 °.
The drying of described step C is finished in conventional drying equipment such as baking oven, baking box, and drying temperature is 95～120 ℃, and be 1～3h time of drying.
The microwave heating reduction of described step D is finished in conventional industrial microwave oven, be about to dry green-ball and be tiled in the charging tray with the bed depth of 30～45mm, charging tray is sent in the industrial microwave oven again, heating heats up, and every 15min exhausting 10s, to get rid of the SO that reduction produces
2Gas, moisture etc.
Described step e broken, be finely ground in the fine powder of granularity less than 0.2mm ,-200 purpose fine powders should account for 20.00～35.00% mass ratio.
The magnetic separation of described step F is finished with conventional magnetic separator.
The invention has the advantages that:
1, by microwave heating, make raw material fast in heating rate, homogeneous heating, in the microwave environments such as thermo-efficiency height, take full advantage of the autoreduction characteristic of powdered iron ore and oxidation sludge and coal dust, and the sweetening effectiveness of sweetening agent, produce metallized pellet high-quality, less energy-consumption.And magneticly elect high-quality reduced iron powder in conjunction with magnetic separation process.
2, by the microwave heating reduction, 1 ton of direct-reduced iron of every production can reduce 0.172 ton of reductive agent hard coal consumption, calculates by half industrial test hard coal fixed carbon content 76.76%, and 1 ton of direct-reduced iron of every production can discharge CO less in air
20.630 ton, the therefore microwave heating of the present invention method of original production direct-reduced iron also can not only reduce, production cost, and can also reduce CO
2Discharging, be a kind of novel process of low-carbon environment-friendly.
3, microwave heating reduction of the present invention, be that electrically heated is changed into microwave heating, do not need coal combustion or coal gas boosting, both simplified Production Flow Chart, significantly shorten the recovery time again, recovery time has shortened more than 85% than traditional technology, in addition, also help and adopt automatization to control, easy to operate, reduce working strength of workers greatly, significant to the development of non-blast furnace ironmaking and short flow process direct steelmaking.
Description of drawings
Fig. 1 is microwave heating reduction of carbonaceous iron ore pellets process flow sheet of the present invention.
Embodiment
Be described further below in conjunction with the present invention of embodiment.
The chemical ingredients of iron-bearing material sees the following form.
Chemical ingredients/the % of iron-bearing material
| Title | TFe | FeO | SiO 2 | CaO | MgO | Al 2O 3 | MnO | S |
| Iron ore concentrate | 62.98 | 24.86 | 6.86 | 0.43 | 0.81 | 1.36 | 0.04 | 0.024 |
| Oxidation sludge | 69.18 | 53.60 | 2.84 | 1.44 | 0.62 | 0.64 | 0.63 | 0.020 |
Embodiment 1
A, the mass percent that oxidation sludge and iron ore concentrate are pressed 40:60 are mixed as iron material, coke powder and pulverized anthracite are pressed the mass percent mixing of 50:50 as reductive agent, and iron material by mass percentage is 68%, reductive agent is 25%, light dolomite is 5%, wilkinite is 2% ratio mixing, add suitable quantity of water in the mixing, get compound;
B, the compound of steps A is placed conventional balling disc, add suitable quantity of water routinely and make ball, wherein, the main technical details of balling disc is: diameter Ф=1000mm, rotating speed 40r/min, the high h=150mm in limit, inclination alpha=45 °; The green-ball made is through artificial screening, with the green-ball of 10～15mm as qualified green-ball;
C, the green-ball of step B is placed in the baking oven, under 105 ℃, it is 0.8% dry pelletizing that dry 2h gets water content;
D, the dry pelletizing of step C is the shape that looses is tiled in the charging tray, control bed depth is 40mm, and charging tray is sent in the conventional industrial microwave process furnace, is warming up to 1100 ℃, reduces 160min, and every 15min exhausting 10s after the cooling, obtains metallized pellet;
E, with the metallized pellet of step D, through conventional broken, be finely ground to granularity less than the reduced iron fine powder of 0.2mm, wherein-200 the purpose ratio accounts for 20.00%;
F, be under the condition of 0.5A in magnetic separator strength of current, the reduced iron powder of step e is carried out magnetic separation, the iron powder of selecting is the reduced iron powder of TFe93.16%, MFe85.08%, degree of metalization 91.33%, and the gangue of selecting send waasteyard to stack.
Described industrial microwave oven adopts the power supply of 220V power supply, 6 groups of microwave sources is arranged, every group of 3 phases, every phase average 12A, total current 216 A, power 47.52 kW.
Embodiment 2
A, the mass percent that oxidation sludge and iron ore concentrate are pressed 35:65 are mixed, and iron material by mass percentage is 60.0%, the high-quality anthracite powder is 30%, Wingdale is 7%, wilkinite is that 3% ratio cooperates, mixing, adds suitable quantity of water in the mixing, gets compound;
B, the compound of steps A is placed conventional balling disc, add suitable quantity of water routinely and make ball, the balling disc main technical details is: diameter Ф=1000mm, rotating speed 40r/min, the high h=150mm in limit, inclination alpha=45 °.The green-ball made is through artificial screening, with the green-ball of 10～15mm as qualified green-ball;
C, the green-ball of step B is placed in the baking oven, to get water content be 0.9% dry pelletizing to dry 3h under 95 ℃ of conditions;
D, the dry pelletizing of step C is the shape that looses is tiled in the charging tray, control bed depth 30mm sends into charging tray in the industrial microwave process furnace, is warming up to 1050 ℃, reduction 180min, and every 15min exhausting 10s after the cooling, obtains metallized pellet;
E, with the metallized pellet of step D, through conventional broken, be finely ground to granularity less than the reduced iron fine powder of 0.2mm, wherein-200 the purpose ratio accounts for 35.00% mass ratio;
F, be under the condition of 1.0A in magnetic separator strength of current, the reduced iron powder of step e is carried out magnetic separation, the iron powder of selecting is the reduced iron powder of TFe91.03%, MFe83.71%, degree of metalization 91.96%, and the gangue of selecting send waasteyard to stack.
Described industrial microwave oven adopts the power supply of 220V power supply, 6 groups of microwave sources is arranged, every group of 3 phases, every phase average 12A, total current 216 A, power 47.52 kW.
Embodiment 3
A, the mass percent that oxidation sludge and iron ore concentrate are pressed 45:55 are mixed, and iron material by mass percentage is 72.5%, coke powder is 22%, unslaked lime is 3%, wilkinite is that 2.5% ratio cooperates, mixing, adds suitable quantity of water in the mixing, gets compound;
B, the compound of steps A is placed conventional balling disc, add suitable quantity of water routinely and make ball, the balling disc main technical details is: diameter Ф=1000mm, rotating speed 40r/min, the high h=150mm in limit, inclination alpha=45 °; The green-ball made is through artificial screening, with the green-ball of 10～15mm as qualified green-ball;
C, the green-ball of step B is placed in the baking oven, to get water content be 0.7% dry pelletizing to dry 1h under 120 ℃ of conditions;
D, the dry pelletizing of step C is the shape that looses is tiled in the charging tray, control bed depth 45mm sends into charging tray in the industrial microwave oven, is warming up to 1150 ℃, reduction 160min, and every 15min exhausting 10s after the cooling, obtains metallized pellet;
E, with the metallized pellet of step D, through broken, be finely ground to granularity less than the reduced iron fine powder of 0.2mm, wherein-200 the purpose ratio accounts for 30.00% mass ratio;
F, be under the condition of 1.5A in magnetic separator strength of current, the reduced iron powder of step e is carried out magnetic separation, the iron powder of selecting is the reduced iron powder of TFe89.58%, MFe83.14%, degree of metalization 92.81%; The gangue of selecting send waasteyard to stack.
Described industrial microwave oven adopts the power supply of 220V power supply, 6 groups of microwave sources is arranged, every group of 3 phases, every phase average 12A, total current 216 A, power 47.52 kW.
Claims (9)
1. the method for direct-reduced iron powder is produced in a microwave heating, it is characterized in that carrying out according to the following steps:
A, by following mass percent preparation raw material:
Iron material 60～73%
Reductive agent 22～30%
Sweetening agent 3～7%
Wilkinite 2～3%
Summation is 100%;
B, the raw material of steps A is added water through routine mix, make ball, screening, get the green-ball that sphere diameter is 10～15mm;
C, the green-ball of step B is dried to the green-ball water content less than 1% mass ratio through routine;
D, the dry green-ball of step C is sent in the microwave oven, be warming up to 1050～1150 ℃, reduction 160～180min gets metallized pellet;
E, with the metallized pellet of step C through conventional broken, be finely ground to granularity less than the fine powder of 0.2mm;
F, be under the condition of 0.5～1.5A in magnetic separation strength of current, the fine powder of step e is carried out magnetic separation, magnetic separation gets the direct-reduced iron powder.
2. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, it is characterized in that iron material in the described steps A is one or both the mixing in oxidation sludge or the iron ore concentrate, and two kinds mixing quality ratio is: oxidation sludge: iron ore concentrate=30～50:50～70, the selection of concrete kind and mix determining of ratio is 65～70% to be advisable with TFe in the iron material.
3. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, it is characterized in that described reductive agent is one or both in coke powder or the coal dust, and two kinds mixing quality ratio is arbitrarily.
4. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, it is characterized in that described sweetening agent is a kind of in Wingdale or unslaked lime or the light dolomite.
5. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, the ball of making that it is characterized in that described step B is finished at conventional balling disc, and its main technical details is: diameter Ф=1000mm, rotating speed 40r/min, the high h=150mm in limit, inclination alpha=45 °.
6. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, and the drying that it is characterized in that described step C is finished in conventional drying equipment such as baking oven, baking box, and drying temperature is 95～120 ℃, and be 1～3h time of drying.
7. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, the microwave heating reduction that it is characterized in that described step D is finished in conventional industrial microwave oven, being about to dry green-ball is tiled in the charging tray with the bed depth of 30～45mm, again charging tray is sent in the industrial microwave oven, heating heats up, and every 15min exhausting 10s, to get rid of the SO that reduction produces
2Gas, moisture etc.
8. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, it is characterized in that described step e broken, be finely ground in the fine powder of granularity less than 0.2mm ,-200 purpose fine powders should account for 20.00～35.00% mass ratio.
9. the method for direct-reduced iron powder is produced in microwave heating as claimed in claim 1, it is characterized in that the magnetic separation of described step F is finished with conventional magnetic separator.
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| CN103526011A (en) * | 2013-09-29 | 2014-01-22 | 攀枝花学院 | Vanadium tailing carbon-containing pellet and preparation method thereof |
| CN103572044A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN104357656A (en) * | 2014-11-20 | 2015-02-18 | 湖北丹江口市宝洲冶金材料有限公司 | Organic adhesive and blast furnace ironmaking pellet prepared from same |
| CN104388620A (en) * | 2014-11-27 | 2015-03-04 | 内蒙古科技大学 | Method for intensifying direction reduction of iron-powder-containing internal carbon pellet by using magnetic field |
| CN104745757A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace |
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| CN107034356A (en) * | 2017-05-09 | 2017-08-11 | 江苏省冶金设计院有限公司 | A kind of method of microwave tunnel kiln reduction apparatus and its smart iron ore of reduction |
| CN107214342A (en) * | 2017-05-31 | 2017-09-29 | 武钢集团昆明钢铁股份有限公司 | A kind of reduced iron powder and preparation method thereof |
| CN110004291A (en) * | 2019-04-23 | 2019-07-12 | 中南大学 | A kind of method of Ferrous Metallurgy dust efficient process co-production direct-reduction iron powder |
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| CN103526011B (en) * | 2013-09-29 | 2015-08-05 | 攀枝花学院 | Tailings in vanadium extraction carbonaceous pelletizing and preparation method thereof |
| CN103572044B (en) * | 2013-10-12 | 2015-03-04 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN103572044A (en) * | 2013-10-12 | 2014-02-12 | 酒泉钢铁(集团)有限责任公司 | Method for producing iron hot-pressed carbon-containing pellets through direction reduction on metallized iron powder |
| CN104745757A (en) * | 2013-12-27 | 2015-07-01 | 中冶长天国际工程有限责任公司 | Microwave-fuel combined heating-type coal-based direct reduction method and rotary hearth furnace |
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| CN104357656A (en) * | 2014-11-20 | 2015-02-18 | 湖北丹江口市宝洲冶金材料有限公司 | Organic adhesive and blast furnace ironmaking pellet prepared from same |
| CN104388620A (en) * | 2014-11-27 | 2015-03-04 | 内蒙古科技大学 | Method for intensifying direction reduction of iron-powder-containing internal carbon pellet by using magnetic field |
| CN104388620B (en) * | 2014-11-27 | 2016-08-10 | 内蒙古科技大学 | A kind of method of magnetic field-intensification iron content powder carbon-burdened pellet direct-reduction |
| CN105755197A (en) * | 2016-05-09 | 2016-07-13 | 安徽工业大学 | Device for continuously producing molten steel by performing microwave and induction heating on carbon-containing pellets |
| CN107034356A (en) * | 2017-05-09 | 2017-08-11 | 江苏省冶金设计院有限公司 | A kind of method of microwave tunnel kiln reduction apparatus and its smart iron ore of reduction |
| CN107214342A (en) * | 2017-05-31 | 2017-09-29 | 武钢集团昆明钢铁股份有限公司 | A kind of reduced iron powder and preparation method thereof |
| CN110004291A (en) * | 2019-04-23 | 2019-07-12 | 中南大学 | A kind of method of Ferrous Metallurgy dust efficient process co-production direct-reduction iron powder |
| WO2023126031A3 (en) * | 2023-03-13 | 2023-08-17 | 华北理工大学 | Method for preparing steel sheet strips via electro-hydrogen cooperation under microwave radiation |
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