CN102978320A - Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner - Google Patents
Method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in microwave heating manner Download PDFInfo
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- CN102978320A CN102978320A CN2012104814743A CN201210481474A CN102978320A CN 102978320 A CN102978320 A CN 102978320A CN 2012104814743 A CN2012104814743 A CN 2012104814743A CN 201210481474 A CN201210481474 A CN 201210481474A CN 102978320 A CN102978320 A CN 102978320A
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Abstract
The invention relates to a method for preparing direct-reduction iron by reducing carbon-containing iron ore powder in a microwave heating manner. A microwave heating manner is induced to a coal-based method direct-reduction iron preparation so as to replace the traditional coal heating manner, and high-quality direct-reduction iron is produced by utilizing self-reduction characteristics of iron ore powder, oxidizing slag and the like with coal powder. Through the method for preparing the direct-reduction iron by reducing the carbon-containing iron ore powder, the defects that the reduction time is long, the product quality is unlikely to control, the investment is large, the floor space is large and the like in a process of producing the direct-reduction iron by a coal-based tunnel kiln canning external carbon method can be effectively overcome, the production flow is simplified, the reduction time is largely shortened, the manual cost is reduced, and the certain energy-saving and emission reduction effect can be obtained.
Description
Technical field
The present invention is the method that a kind of microwave reduction carbon containing powdered iron ore prepares direct-reduced iron, is applicable to the abundant regional development microwave non-blast furnace ironmaking of electric power resource etc., belongs to the microwave metallurgical technical applications.
Background technology
As one of emerging, ground-breaking cutting edge technology, direct-reduced iron is that raw material direct-reductions under solid conditions such as iron ore are the cavernous iron product of low-carbon (LC), coking and the sintering circuit of blast furnace iron-making process have been saved, can effectively overcome large, the shortcomings such as energy consumption is high, long flow path of blast furnace ironmaking investment, adapt to better modern steel enterprise constantly to the trend of densification, high efficiency, serialization, noble and unsullied purification and environmentally friendly future development.Direct-reduced iron has the good characteristics such as chemical composition stability, foreign matter content is few, harmful element content is low, and purposes is very extensive, and demand is large.
Adopt at present the canned outer carbon method of joining of coal-based tunnel furnace to produce direct-reduced iron, have following deficiency: (1) is owing to adopt the 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, need the long time, the existing residence time of process stream in tunnel furnace reached about 70 hours, pre-heating temperature elevation to 1150 ℃ need 12 hours, reduction needs 43 hours, also need simultaneously the body of heater than large space is heated, thermo-efficiency is low, exists long, the shortcoming such as energy consumption is high of process time.(2) cause easily the temperature of charge skewness, quality product is difficult to control, and the phenomenons such as underburnt, burning easily occur, and brings processing difficulties to subsequent handling.(3) investment is large, and floor space is large.Need to build gazogene.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 deficiency that the carbon method is produced the direct-reduced iron method of joining of coal-based tunnel furnace, provide a kind of microwave reduction carbon containing powdered iron ore to prepare the method for direct-reduced iron.
Microwave belongs to a kind of cleaning heating energy source, and it is fast to have heating rate, homogeneous heating, thermo-efficiency high.Its outstanding advantages is to carry out the selectivity heating to the powdery metallurgical material, the self-reductivity that utilization has with addition of the fine iron breeze that coal dust is arranged and the ability that microwave selective is absorbed, adopt microwave heating to carry out direct-reduction, can not consider the agglomeration process of metallurgical material, directly use the powdery metallurgical material to carry out microwave heating and reduction, significant to the development of non-blast furnace ironmaking and short flow process direct steelmaking.
The method that microwave reduction carbon containing powdered iron ore of the present invention prepares direct-reduced iron is carried out according to the following steps:
A, by following mass percent preparation raw material:
Iron material 63～75%
Reductive agent 22～30%
Sweetening agent 3～7%
B, the raw material of above-mentioned A step preparation is loose shape is tiled in the charging tray, bed depth 30～45mm, after charging tray pushes the microwave pushed bat kiln, being warming up to 1050～1150 ℃ reduces, reduction 160～180min, every 15min exhausting 10s, then cooling is tapped a blast furnace, and gets the direct-reduction iron product after scum separates.
Described iron material is one or both the mixing in oxidation sludge or the iron ore concentrate, and the ratio of mixture during mixing is: oxidation sludge: iron ore concentrate=30～50:50～70, the selection of concrete kind and mix ratio TFe in the iron material and be advisable as 65～70%.
Described reductive agent is one or both in coke powder or the coal dust.
Described sweetening agent is a kind of in Wingdale or unslaked lime or the light dolomite.
Advantage of the present invention:
1, in the preparation of coal-based method direct-reduced iron, introduces microwave heating, replace traditional heated by gas mode with microwave heating, utilize the autoreduction characteristic of powdered iron ore, oxidation sludge etc. and coal dust, obtain ordinary method and be difficult to the excellent effect that maybe can't obtain.
2, low-carbon environment-friendly.Adopt tunnel furnace method to produce direct-reduced iron, the consumption of its reductive agent is 0.56 ton/ton, adopting microwave method reductive agent consumption is 0.375 ton/ton, 1 ton of direct-reduced iron of every production, can reduce 0.185 ton of reductive agent hard coal consumption, calculate by half industrial test hard coal fixed carbon content 76.76%, 1 ton of direct-reduced iron of every production can discharge CO less in air
20.678 ton can not only reduce production costs so adopt microwave method to prepare direct-reduced iron, and can also reduce CO
2Discharging, be a kind of novel process of low-carbon environment-friendly.
3, simplify Production Flow Chart.Microwave method prepares direct-reduced iron and electricity is changed into microwave heats, and does not need coal combustion or coal gas boosting, does not need the briquetting with raw material elder generation, has shortened technical process, can significantly shorten the recovery time.Whole production process is finished in airtight kiln, and production environment is very friendly.In addition, what microwave method prepared the direct-reduced iron employing is that PLC controls automatically, easy to operate, will greatly reduce people's workload, reduces cost of labor.
4, adopt the mode of production of microwave reduction powder, the recovery time shortens more than 85% than traditional technology.
Description of drawings
Fig. 1 is microwave reduction carbon containing powdered iron ore process flow sheet of the present invention.
Embodiment
The embodiment with tunnel furnace production direct-reduced iron that provides below in conjunction with accompanying drawing is described further the present invention.
Raw materials quality sees following table for details.
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, and coke powder and pulverized anthracite press the mass percent of 50:50 and mixed as reductive agent, and the ratio cooperation mixing of iron material 70%, reductive agent 25%, light dolomite 5% by mass percentage.
B, the raw material of above-mentioned A step preparation is loose shape is tiled in the charging tray, bed depth 40mm, after charging tray pushes the microwave pushed bat kiln, be warming up to 1100 ℃, reduction 160min, every 15min exhausting 10s, then cooling is tapped a blast furnace, and obtains the direct-reduction iron product of TFe87.43%, MFe76.07%, degree of metalization 87.21% after scum separates.
Embodiment 2
A, the mass percent that oxidation sludge and iron ore concentrate are pressed 35:65 are mixed, and the ratio of iron material 63%, high-quality anthracite powder 30%, Wingdale 7% cooperates mixing by mass percentage;
B, the raw material of above-mentioned A step preparation is loose shape is tiled in the charging tray, bed depth 45mm, after charging tray pushes the microwave pushed bat kiln, be warming up to 1150 ℃, reduction 180min, every 15min exhausting 10s, then cooling is tapped a blast furnace, and obtains the direct-reduction iron product of TFe82.43%, MFe74.08%, degree of metalization 89.97% after scum separates.
Embodiment 3
A, the mass percent that oxidation sludge and iron ore concentrate are pressed 45:55 are mixed, and the ratio of iron material 75%, coke powder 22%, unslaked lime 3% cooperates mixing by mass percentage.
B, the raw material of above-mentioned A step preparation is loose shape is tiled in the charging tray, bed depth 30mm, after charging tray pushes the microwave pushed bat kiln, be warming up to 1050 ℃, reduction 160min, every 15min exhausting 10s, then cooling is tapped a blast furnace, and obtains the direct-reduction iron product of TFe90.98%, MFe83.28%, degree of metalization 91.54% after scum separates.
Described pushed bat kiln adopts the 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 (2)
1. a microwave reduction carbon containing powdered iron ore prepares the method for direct-reduced iron, it is characterized in that carrying out according to the following steps:
A, by following mass percent preparation raw material:
Iron material 63～75%
Reductive agent 22～30%
Sweetening agent 3～7%
B, the raw material of above-mentioned A step preparation is loose shape is tiled in the charging tray, bed depth 30～45mm, after charging tray pushes the microwave pushed bat kiln, being warming up to 1050～1150 ℃ reduces, reduction 160～180min, every 15min exhausting 10s, then cooling is tapped a blast furnace, and gets the direct-reduction iron product after scum separates;
Described reductive agent is one or both in coke powder or the coal dust, and described sweetening agent is a kind of in Wingdale or unslaked lime or the light dolomite.
2. microwave reduction carbon containing powdered iron ore according to claim 1 prepares the method for direct-reduced iron, it is characterized in that described iron material is one or both the mixing in oxidation sludge or the iron ore concentrate, the ratio of mixture during mixing is: oxidation sludge: iron ore concentrate=30～50:50～70.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104561425A (en) * | 2015-02-12 | 2015-04-29 | 王俊 | Device for preparing reduced iron powder by gas-base microwave heating continuous industry and application method thereof |
| 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 |
| CN107151722A (en) * | 2016-03-02 | 2017-09-12 | 中冶长天国际工程有限责任公司 | Microwave fuel combined heat coal-based direct reduction experimental rig and method |
| CN108842056A (en) * | 2018-09-07 | 2018-11-20 | 安徽工业大学 | A kind of oolitic hematite quickly heats the method that reduction prepares reduced iron powder |
| CN113403440A (en) * | 2021-06-11 | 2021-09-17 | 张振逵 | Production process and equipment for virus-free sponge iron hydrogen carbon steel industrial chain |
| CN113736932A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Preparation method of carbon-iron composite furnace charge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103290159B (en) * | 2013-06-06 | 2015-09-09 | 昆明钢铁集团有限责任公司 | The method of direct-reduction iron powder is produced in a kind of microwave heating |
| 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 |
| CN104745757B (en) * | 2013-12-27 | 2017-06-16 | 中冶长天国际工程有限责任公司 | A kind of microwave fuel combined heat formula coal-based direct reduction method and rotary hearth furnace |
| CN104561425A (en) * | 2015-02-12 | 2015-04-29 | 王俊 | Device for preparing reduced iron powder by gas-base microwave heating continuous industry and application method thereof |
| CN107151722A (en) * | 2016-03-02 | 2017-09-12 | 中冶长天国际工程有限责任公司 | Microwave fuel combined heat coal-based direct reduction experimental rig and method |
| CN107151722B (en) * | 2016-03-02 | 2023-03-10 | 中冶长天国际工程有限责任公司 | Microwave fuel combined heating coal-based direct reduction test device and method |
| CN108842056A (en) * | 2018-09-07 | 2018-11-20 | 安徽工业大学 | A kind of oolitic hematite quickly heats the method that reduction prepares reduced iron powder |
| CN113736932A (en) * | 2020-05-29 | 2021-12-03 | 宝山钢铁股份有限公司 | Preparation method of carbon-iron composite furnace charge |
| CN113403440A (en) * | 2021-06-11 | 2021-09-17 | 张振逵 | Production process and equipment for virus-free sponge iron hydrogen carbon steel industrial chain |
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Application publication date: 20130320 |