CN103205519B - Technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating - Google Patents
Technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating Download PDFInfo
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- CN103205519B CN103205519B CN201310145836.6A CN201310145836A CN103205519B CN 103205519 B CN103205519 B CN 103205519B CN 201310145836 A CN201310145836 A CN 201310145836A CN 103205519 B CN103205519 B CN 103205519B
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Abstract
The invention discloses a technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating. The technology comprises procedures of evenly distributing the fly ash into mobile bed of a microwave reduction furnace, heating and cooling the fly ash; the heating procedure is orderly divided into a baking temperature zone, a preheating temperature zone, a baking temperature zone and a sintering temperature zone; the temperature is gradually improved to heat; the temperature of the baking temperature zone is 80-120 DEG C; the temperature of the preheating temperature zone is 200-600 DEG C; the temperature of the baking temperature zone is 700-1100 DEG C; the temperature of the sintering temperature zone is 1300-1550 DEG C; and the delivery speed of the mobile bed is controlled at 0.8-1.2m/m. The microwave belongs a body heating mode, is fast to heat, even to heat, and low in energy consumption; the fly ash contains carbon; the reducing agents such as carbon do not need to be added; and ferric oxide can be directly restored, so as to play the roles of saving energy sources and reducing the production cost. The microwave is a clean energy source, does not generate any pollution, and benefits for environmental protection.
Description
Technical field
The invention belongs to ferrous metallurgy field, relate to the technique that iron is extracted in steel-making and ironmaking in dedusting ash, be specifically related to a kind ofly utilize microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron.
Background technology
In the dedusting ash that steel mill produces, contain 50% ferric oxide, 9% carbon, remaining is mainly comprised of calcium oxide, magnesium oxide, aluminium sesquioxide, zinc, indium etc.
At present, adopt tunnel furnace burning coal heating method separation of iron from dedusting ash, this method has following deficiency: a, owing to adopting producer gas type of heating, heat is outside by heat transfer type transmission from outward appearance to inner essence such as convection current, conduction, radiation from material, length consuming time, also need the body of heater of larger space to heat, thermo-efficiency is low simultaneously, exists long, the shortcoming such as energy consumption is high of process time; B, easily cause material skewness, quality product to be difficult to control, underburnt, burning easily occur; C, need to consume a large amount of coal while producing, contaminate environment, production cost are high.
Summary of the invention
The object of the invention is the defect existing in order to overcome prior art, the microwave technology that adopts saving power and preventing pollution to dye, realizes the object that improves the rate of recovery of iron in dedusting ash.
The present invention is that the technical scheme that realizes goal of the invention employing is, utilize microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron, comprise in the uniform moving-bed that enters microwave reduction furnace of dedusting ash, dedusting ash is heated and cooling operation, described heating process is divided into oven dry, preheating, roasting, four warm areas of sintering successively, progressively improve temperature and heat, concrete is: the temperature of drying warm area is 80～120 ℃; The temperature of preheating warm area is 200～600 ℃; The temperature of roasting warm area is 700～1100 ℃; The temperature of sintering warm area is 1300～1550 ℃, and the transfer rate of moving-bed is controlled at 0.8～1.2 m/min.
Described dedusting ash is with in the uniform moving-bed that enters microwave reduction furnace of the thickness of 100～200mm.
Described dedusting ash is cooling is cooling 20～40 minutes of cooling zone at normal temperatures.
The length of described oven dry warm area is 2～5 meters.
The length of described preheating warm area is 3～8 meters.
The length of described roasting warm area is 8～12 meters.
The length of described sintering warm area is 15～25 meters.
The present invention utilizes microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron, there is following characteristics: microwave heating is at the inner dielectric medium that produces of material, to dissipate direct heating material by microwave field, belong to the body type of heating without thermograde, heat up rapidly, homogeneous heating, power consumption be low.Microwave can promote heat absorption and release reaction simultaneously, and chemical reaction is had to katalysis, because dedusting ash itself contains carbon, and therefore without additionally adding the reductive agents such as carbon, can be directly by iron oxide reduction, the object that play save energy, reduces production costs.Microwave is a kind of clean energy, and itself does not produce any pollution, is conducive to environment protection, and microwave heating is flexible, can realize automatization and control.Use microwave heating can make to contain in dedusting ash the materials such as calcium oxide, magnesium oxide, aluminium sesquioxide, zinc, indium, these materials all absorb microwave, through oven dry, preheating, roasting, four interval heating of sintering, these impurity volatilizations are finally discharged from microwave reduction stove, have realized the extraction of iron.Utilize microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron, processing dedusting ash amount 2.5T per hour, produces iron 1T, year 10000 tons of pig iron of designed capacity.This method facility investment is few, and technique is simple, and flow process is short, and efficiency is high, and energy consumption is low, three-waste free discharge.
Meanwhile, the off-gas recovery producing while utilizing induced draft by production, reclaims the noble metals such as Zn, In, Pb through condensation, sack cleaner, and recycling chemical industry method is separated, realizes the abundant recycling of resource.
Embodiment
Utilize microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron, comprise in the uniform moving-bed that enters microwave reduction furnace of dedusting ash, dedusting ash is heated and cooling operation, described heating process is divided into oven dry, preheating, roasting, four warm areas of sintering successively, progressively improve temperature and heat, concrete is: the temperature of drying warm area is 80～120 ℃; The temperature of preheating warm area is 200～600 ℃; The temperature of roasting warm area is 700～1100 ℃; The temperature of sintering warm area is 1300～1550 ℃, and the transfer rate of moving-bed is controlled at 0.8～1.2 m/min.
Described dedusting ash is with in the uniform moving-bed that enters microwave reduction furnace of the thickness of 100～200mm.
Described dedusting ash is cooling is cooling 20～40 minutes of cooling zone at normal temperatures.
The length of described oven dry warm area is 2～5 meters.
The length of described preheating warm area is 3～8 meters.
The length of described roasting warm area is 8～12 meters.
The length of described sintering warm area is 15～25 meters.
Embodiment 1: by dedusting ash with in the uniform moving-bed that enters microwave oven of the thickness of 100mm, the running speed of moving-bed is 0.8 m/min, first dedusting ash enters temperature is that 80 ℃, length are the oven dry warm area of 2 meters, then enters temperature and be 200 ℃, length and be the preheating warm area of 3 meters; Enter again temperature and be 700 ℃, length and be the roasting warm area of 8 meters; Final temp is that 1200 ℃, length are the sintering warm area of 15 meters; After having heated, cooling 20 minutes of cooling zone at normal temperatures.
Embodiment 2: by dedusting ash with in the uniform moving-bed that enters microwave oven of the thickness of 125mm, the running speed of moving-bed is 0.9 m/min, first dedusting ash enters temperature is that 90 ℃, length are the oven dry warm area of 3 meters, then enters temperature and be 300 ℃, length and be the preheating warm area of 4 meters; Enter again temperature and be 800 ℃, length and be the roasting warm area of 9 meters; Final temp is that 1350 ℃, length are the sintering warm area of 18 meters; After having heated, cooling 25 minutes of cooling zone at normal temperatures.
Embodiment 3: by dedusting ash with in the uniform moving-bed that enters microwave oven of the thickness of 150mm, the running speed of moving-bed is 1.0 ms/min, first dedusting ash enters temperature is that 100 ℃, length are the oven dry warm area of 4 meters, then enters temperature and be 500 ℃, length and be the preheating warm area of 5 meters; Enter again temperature and be 800 ℃, length and be the roasting warm area of 10 meters; Final temp is that 1500 ℃, length are the sintering warm area of 20 meters; After having heated, cooling 30 minutes of cooling zone at normal temperatures.
Embodiment 4: by dedusting ash with in the uniform moving-bed that enters microwave oven of the thickness of 180mm, the running speed of moving-bed is 0.9 m/min, first dedusting ash enters temperature is that 110 ℃, length are the oven dry warm area of 4 meters, then enters temperature and be 500 ℃, length and be the preheating warm area of 6 meters; Enter again temperature and be 900 ℃, length and be the roasting warm area of 11 meters; Final temp is that 1400 ℃, length are the sintering warm area of 23 meters; After having heated, cooling 35 minutes of cooling zone at normal temperatures.
Embodiment 5: by dedusting ash with in the uniform moving-bed that enters microwave oven of the thickness of 200mm, the running speed of moving-bed is 1.2 ms/min, first dedusting ash enters temperature is that 120 ℃, length are the oven dry warm area of 5 meters, then enters temperature and be 600 ℃, length and be the preheating warm area of 8 meters; Enter again temperature and be 1100 ℃, length and be the roasting warm area of 12 meters; Final temp is that 1510 ℃, length are the sintering warm area of 25 meters; After having heated, cooling 40 minutes of cooling zone at normal temperatures.
Meanwhile, the off-gas recovery producing while utilizing induced draft by production, reclaims the noble metals such as Zn, In, Pb through condensation, sack cleaner, and recycling chemical industry method is separated, realizes the abundant recycling of resource.
This method facility investment is few, and technique is simple, and flow process is short, and efficiency is high, and energy consumption is low, three-waste free discharge.
Claims (6)
1. utilize microwave heating from steel-making and ironmaking dedusting ash, to extract the technique of iron, comprise in the uniform moving-bed that enters microwave reduction furnace of dedusting ash, dedusting ash is heated and cooling operation, it is characterized in that: described heating process is divided into oven dry, preheating, roasting, four warm areas of sintering successively, progressively improve temperature and heat, concrete is: the temperature of drying warm area is 80～120 ℃; The temperature of preheating warm area is 200～600 ℃; The temperature of roasting warm area is 700～1100 ℃; The temperature of sintering warm area is 1300～1550 ℃, and the transfer rate of moving-bed is controlled at 0.8～1.2 m/min, and described dedusting ash is with in the uniform moving-bed that enters microwave reduction furnace of the thickness of 100～200mm.
2. according to claim 1ly utilize microwave heating to extract the technique of iron dedusting ash from steel-making and ironmaking, it is characterized in that: described dedusting ash is cooling is cooling 20～40 minutes of cooling zone at normal temperatures.
3. according to claim 1ly utilize microwave heating to extract the technique of iron dedusting ash from steel-making and ironmaking, it is characterized in that: the length of described oven dry warm area is 2～5 meters.
4. according to claim 1ly utilize microwave heating to extract the technique of iron dedusting ash from steel-making and ironmaking, it is characterized in that: the length of described preheating warm area is 3～8 meters.
5. according to claim 1ly utilize microwave heating to extract the technique of iron dedusting ash from steel-making and ironmaking, it is characterized in that: the length of described roasting warm area is 8～12 meters.
6. according to claim 1ly utilize microwave heating to extract the technique of iron dedusting ash from steel-making and ironmaking, it is characterized in that: the length of described sintering warm area is 15～25 meters.
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| CN201310145836.6A CN103205519B (en) | 2013-04-25 | 2013-04-25 | Technology for extracting iron from steel-making and ironmaking fly ash by micro-wave heating |
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| CN103205519B true CN103205519B (en) | 2014-12-03 |
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| CN108913897A (en) * | 2018-08-06 | 2018-11-30 | 王德清 | A kind of energy conservation ferrochrome production method |
| CN112844272A (en) * | 2021-02-22 | 2021-05-28 | 河北龙亿环境工程有限公司 | Application of microwave rotary hearth furnace in carbonization reaction |
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| BRPI0717798A2 (en) * | 2006-10-03 | 2014-06-17 | Jiann-Yang Hwang | APPARATUS AND METHOD FOR REDUCING IRON OXIDE |
| CN100497683C (en) * | 2007-07-13 | 2009-06-10 | 太原理工大学 | Method for preparing low-carbon metal manganese iron by using manganese-poor powdered ore |
| CN101457269B (en) * | 2008-12-30 | 2010-10-13 | 重庆高岭投资（集团）有限公司 | Process for directly producing sponge iron by microwave carbothermal reduction steel metallurgical iron-bearing dust |
| JP2010261101A (en) * | 2009-04-07 | 2010-11-18 | Mitsutaka Hino | Method for producing metallic iron |
| CA2807469A1 (en) * | 2010-08-03 | 2012-02-09 | Xiaodi Huang | Method and apparatus for coproduction of pig iron and high quality syngas |
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Inventor after: Duan Ye Inventor after: Zhang Shuhuan Inventor after: Zhang Ruqin Inventor after: Han Yanjun Inventor before: Zhang Shuhuan Inventor before: Zhang Ruqin Inventor before: Han Yanjun |
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