CN109929957A - A kind of device and method of pre-reduced iron ore high melt production molten iron - Google Patents
A kind of device and method of pre-reduced iron ore high melt production molten iron Download PDFInfo
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- CN109929957A CN109929957A CN201910241060.5A CN201910241060A CN109929957A CN 109929957 A CN109929957 A CN 109929957A CN 201910241060 A CN201910241060 A CN 201910241060A CN 109929957 A CN109929957 A CN 109929957A
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Abstract
A kind of device and method of pre-reduced iron ore high melt production molten iron, device include that furnace body, electrode and coal-fired spray gun, feedstock transportation pipeline are inserted into furnace interior；Upper space is equipped with high-temperature flue gas outlet, electrode and coal-fired spray gun, electrode bottom end and is located in slag blanket area, and slag-drip opening is located in slag blanket space, and molten iron outlet is connected to iron pelagic division；Method are as follows: (1) by pre-reduced iron ore and flux blending transportation into device, (2) open power supply and spray coal dust, pre-reduced iron ore and flux melts, form melt；(3) ferriferous oxide is reacted with coal dust generates molten iron and clinker, generates electric arc by molten iron and further heats to molten iron；(4) carry out melting when temperature be 1350~1550 DEG C, after open slag-drip opening clinker is discharged, be then turned on molten iron outlet molten iron is discharged.Method of the invention realizes that the collaboration of energy consumption utilizes, and significantly reduces the loss of energy consumption, improves the utilization efficiency of the energy.
Description
Technical field
The invention belongs to metallurgical technology field, in particular to a kind of device of pre-reduced iron ore high melt production molten iron
And method.
Background technique
Currently, blast furnace ironmaking, i.e., using coke, iron-stone (natural richness lump ore, sinter or pellet) and flux (stone
Lime stone, dolomite) the continuous production liquid pig iron in vertical reactor-blast furnace is the main method of modern ironmaking, yield
95% or more of world's pig iron total output is accounted for, this means that it is still in not using environmental pollution problem caused by coke production
Disconnected in-depth state；For this problem, related personnel should increase the research application of non-blast furnace ironmaking technology, to improve China's steel
The industrial structure of iron industry development.
Non-blast furnace ironmaking is different from blast furnace ironmaking, has some superiority in terms of energy consumption；Specifically, non-blast furnace ironmaking
The usage amount of coking coal can be greatly lowered, this reduces the generations of the blast furnace ironmakings process such as pelletizing, sintering and coking process
Pollutant discharge amount；HIsmelt technique is a kind of typical non-blast furnace ironmaking method, and this method is adopted for pre-reduced iron ore
Melting and reducing is carried out with fusion reducing furnace (SRV furnace), obtains qualified molten iron；But that there are coal consumptions is larger for the fusion reducing furnace, therefore,
It needs to research and develop novel low consumption non-blast furnace ironmaking technology and equipment.
Summary of the invention
The object of the present invention is to provide a kind of device and methods of pre-reduced iron ore high melt production molten iron, by right
Pre-reduced iron ore is smelted using special smelting apparatus, the fusing layering point of the synchronous melting and reducing for realizing iron ore and ore
From collaboration utilizes electric energy and Coal Energy Source, reduces production cost.
The device of pre-reduced iron ore high melt production molten iron of the invention includes furnace body, electrode and coal-fired spray gun, original
Material conveying tube road is inserted into furnace interior；Furnace interior is followed successively by upper space, slag blanket area and iron pelagic division from top to bottom, and upper layer is empty
Between be equipped with high-temperature flue gas outlet, electrode and coal-fired spray gun, electrode bottom end and be located in slag blanket area, coal-fired lance outlet and feedstock transportation
Pipe outlet is located in upper space, and slag-drip opening is located in slag blanket space, and molten iron outlet is connected to iron pelagic division.
The method of pre-reduced iron ore high melt production molten iron of the invention be using above-mentioned apparatus, according to the following steps into
Row:
1, after mixing by pre-reduced iron ore and flux, raw to pre-reduced iron ore high melt by pipeline
In the device for producing molten iron, Iron grade TFe >=55%, the MFe mass percent 35~60% of the pre-reduced iron ore, granularity
≤12mm；Flux is lime stone and/or calcium oxide, and the additional amount of flux is by pre-reduced iron ore and the mixed basicity of flux
1.00~2.30, the basicity is CaO+MgO and SiO2+Al2O3Mass values；
2, the three phase mains connecting with electrode is opened, while coal dust is sprayed by carrier gas of air by coal-fired spray gun, is relied on
Heated by electrodes and coal dust burn in the device, make pre-reduced iron ore and flux melts, form melt；
3, melt is in fusion process, and the ferriferous oxide in clinker is reacted with coal dust generates molten iron, and forms clinker, in weight
Under the action of power and density variation, molten iron sinks to bottom of device, and slag floats on above molten iron；Molten iron, which is formed between rear electrode, to be led to
It crosses molten iron and generates electric arc further to molten iron and slag heating；
4, carry out melting when, control pre-reduced iron ore from enter device to fusing when time be 1.5~2.5h, device
Interior temperature is 1350~1550 DEG C, finally makes molten iron full of molten iron sheaf space；Slag-drip opening is opened after melting to arrange clinker
Out, it is then turned on molten iron outlet molten iron is discharged.
TFe >=90% for the molten iron that the above method obtains.
Mass content >=60% of fixed carbon, granularity≤1mm of coal dust in the coal dust that the above method uses.
In the above method, the blowing amount of coal dust presses coal ratio (mass ratio of coal dust and pre-reduced iron ore)=50~300kg/
t。
The principle of the present invention is: synchronous to realize in pre-reduced iron ore after heated by electrodes and coal dust firing heating, fusing
Melting and reducing and liquid slag iron multi_layer extraction；Material heat form uses the electric arc heated of unique design, and is aided with spray gun fire coal
Heating realizes that the collaboration of energy utilizes, significantly reduces the loss of energy consumption, improve the utilization efficiency of the energy.
Detailed description of the invention
Fig. 1 is the apparatus structure schematic diagram that pre-reduced iron ore high melt of the invention produces molten iron；
In figure, 1, electrode, 2, coal-fired spray gun, 3, clinker, 4, molten iron outlet, 5, molten iron, 6, slag-drip opening, 7, feed line
Road, 8, high-temperature flue gas outlet, 9, furnace body.
Specific embodiment
Pre-reduced iron ore in the embodiment of the present invention is iron ore through rotary kiln or tunnel kiln direct reduced generation.
The part of granularity -0.074mm accounts for the 40~60% of coal dust gross mass in coal dust in the embodiment of the present invention.
Pre-reduced iron ore in the embodiment of the present invention is pellet, and Iron grade TFe >=55%, MFe 35~60% is pressed
Mass percent contains SiO23~8%, Al2O33~8%, CaO 0.1~1.5%, MgO 1~11%, P≤0.1%, S≤
0.05%.
Molten iron in the embodiment of the present invention contains Fe 93~96% by mass percentage, C 3.5~4.2%, P≤0.04%,
S≤0.02%, Si≤0.5%, Al≤0.05%.
The coal dust used in the embodiment of the present invention contains fixed carbon 60~78%, the portion of granularity -0.074mm by weight percentage
Divide and accounts for the 40~60% of total weight.
The degree of metalization 70~85% of pellet in the embodiment of the present invention.
The following are the preferred embodiment of the present invention.
Embodiment 1
Pre-reduced iron ore high melt produces the apparatus structure of molten iron as shown in Figure 1, including furnace body 9, electrode 1 and fire coal
Spray gun 2；Feedstock transportation pipeline 7 is inserted into furnace interior；Upper space, slag blanket area and molten iron are followed successively by inside furnace body 9 from top to bottom
Floor area, upper space are equipped with high-temperature flue gas outlet 8, electrode 1 and coal-fired spray gun 2,1 bottom end of electrode and are located in slag blanket area, fire coal spray
The outlet of rifle 2 and the outlet of feedstock transportation pipeline 7 are located in upper space, and slag-drip opening 6 is located in slag blanket space, molten iron outlet 4
It is connected to iron pelagic division；
Using the pellet of certain pre-reduced iron ore, contain TFe 55.62%, MFe 38.93%, SiO by weight percentage2
3.01%, Al2O37.28%, CaO 0.10%, MgO 10.2%, P 0.08%, S 0.03%, granularity≤12mm；
The reducing agent coal dust of use contains fixed carbon 60% by weight percentage, and the part of granularity -0.074mm accounts for total weight
40%；
After mixing by pre-reduced iron ore and flux, it is produced by pipeline to pre-reduced iron ore high melt
In the device of molten iron, flux is lime stone and/or calcium oxide, and the additional amount of flux is mixed by pre-reduced iron ore and flux
Basicity is 1.00；
The three phase mains connecting with electrode is opened, while coal dust is sprayed by carrier gas of air by coal-fired spray gun, by electricity
Pole heating and coal dust burn in the device, make pre-reduced iron ore and flux melts, form melt；The blowing amount of coal dust presses coal ratio
=100kg/t
Melt is in fusion process, and the ferriferous oxide in clinker is reacted with coal dust generates molten iron, while rest part is formed
Clinker, under the action of gravity and density variation, molten iron sinks to bottom of device, and slag floats on above molten iron；After molten iron is formed
Electric arc is generated by molten iron between electrode further to heat molten iron and clinker；
When carrying out melting, control pre-reduced iron ore from enter device to time when fusing be 2.5h, the temperature in device
Degree is 1350 DEG C, finally makes molten iron full of molten iron sheaf space；Slag-drip opening is opened after melting clinker is discharged, be then turned on iron
Molten iron is discharged water out；
The molten iron of acquisition contains Fe 93%, C 3.5%, P 0.04%, S 0.02%, Si 0.5%, Al by mass percentage
0.05%.
Embodiment 2
The pellet of certain prereduction powdery iron ore contains TFe 57.73%, MFe 46.18%, SiO by weight percentage2
7.55%, Al2O33.42%, CaO 1.32%, MgO 2.36%, P 0.09%, S 0.04%, granularity≤12mm；
Reducing agent coal dust contains fixed carbon 78% by weight percentage, and the part of granularity -0.074mm accounts for the 40% of total weight；
Apparatus structure is the same as embodiment 1；With embodiment 1, difference is method:
(1) additional amount of flux is 1.80 by pre-reduced iron ore and the mixed basicity of flux；
(2) the blowing amount of coal dust presses coal ratio=200kg/t；
(3) control pre-reduced iron ore from enter device to time when fusing be 1.5h, the temperature in device is 1550
℃；
The molten iron of acquisition contains Fe 93%, C 4.2%, P 0.03%, S 0.01%, Si 0.4%, Al by mass percentage
0.04%.
Embodiment 3
Using the pellet of certain prereduction powdery iron ore, contain TFe 62.83%, MFe 50.55% by weight percentage,
SiO23.53%, Al2O37.81%, CaO 0.10%, MgO 1.22%, P 0.09%, S 0.04%
The reducing agent coal dust of use contains fixed carbon 63% by weight percentage, and granularity -0.074mm accounts for 60%；
Apparatus structure is the same as embodiment 1；With embodiment 1, difference is method:
(1) additional amount of flux is 2.30 by pre-reduced iron ore and the mixed basicity of flux；
(2) the blowing amount of coal dust presses coal ratio=300kg/t；
(3) control pre-reduced iron ore from enter device to time when fusing be 2h, the temperature in device is 1400 DEG C；
The molten iron of acquisition contains Fe 96%, C 3.5%, P 0.04%, S 0.01%, Si 0.3%, Al by mass percentage
0.03%.
Embodiment 4
Using the pellet of certain prereduction powdery iron ore, contain TFe 65.67%, MFe 55.82% by weight percentage,
SiO24.21%, Al2O32.36%, CaO 0.10%, MgO 0.16%, P 0.09%, S 0.04%
The reducing agent coal dust of use contains fixed carbon 78% by weight percentage, and granularity -0.074mm accounts for 55%；
Apparatus structure is the same as embodiment 1；With embodiment 1, difference is method:
(1) additional amount of flux is 1.50 by pre-reduced iron ore and the mixed basicity of flux；
(2) the blowing amount of coal dust presses coal ratio=150kg/t；
(3) control pre-reduced iron ore from enter device to time when fusing be 1.5h, the temperature in device is 1500
℃；
The molten iron of acquisition contains Fe 94%, C 4.1%, P 0.03%, S 0.02%, Si 0.5%, Al by mass percentage
0.04%.
Claims (5)
1. a kind of device of pre-reduced iron ore high melt production molten iron, it is characterised in that including furnace body, electrode and coal-fired spray
Rifle, feedstock transportation pipeline are inserted into furnace interior；Furnace interior is followed successively by upper space, slag blanket area and iron pelagic division from top to bottom,
Upper space is equipped with high-temperature flue gas outlet, electrode and coal-fired spray gun, electrode bottom end and is located in slag blanket area, coal-fired lance outlet and original
The outlet of material conveying tube road is located in upper space, and slag-drip opening is located in slag blanket space, and molten iron outlet is connected to iron pelagic division.
2. a kind of method of pre-reduced iron ore high melt production molten iron, it is characterised in that use dress described in claim 1
It sets, sequentially includes the following steps:
(1) after mixing by pre-reduced iron ore and flux, it is produced by pipeline to pre-reduced iron ore high melt
In the device of molten iron, Iron grade TFe >=55%, the MFe mass percent 35~60% of the pre-reduced iron ore, granularity≤
12mm；Flux is lime stone and/or calcium oxide, and the additional amount of flux is by pre-reduced iron ore and the mixed basicity of flux
1.00~2.30, the basicity is CaO+MgO and SiO2+Al2O3Mass values；
(2) three phase mains connecting with electrode is opened, while coal dust is sprayed by carrier gas of air by coal-fired spray gun, by electrode
Heating and coal dust burn in the device, make pre-reduced iron ore and flux melts, form melt；
(3) melt is in fusion process, and the ferriferous oxide in clinker is reacted with coal dust generates molten iron, and forms clinker, in gravity
Under the action of density variation, molten iron sinks to bottom of device, and slag floats on above molten iron；Molten iron forms between rear electrode and passes through
Molten iron generates electric arc and further heats to molten iron and slag；
(4) when carrying out melting, control pre-reduced iron ore from enter device to time when fusing be 1.5~2.5h, in device
Temperature be 1350~1550 DEG C, finally make molten iron full of molten iron sheaf space；It opens slag-drip opening after melting clinker is discharged,
It is then turned on molten iron outlet molten iron is discharged.
3. a kind of method of pre-reduced iron ore high melt production molten iron according to claim 2, it is characterised in that institute
TFe >=90% for the molten iron stated.
4. a kind of method of pre-reduced iron ore high melt production molten iron according to claim 2, it is characterised in that institute
Mass content >=60% of fixed carbon in the coal dust stated, granularity≤1mm of coal dust.
5. a kind of method of pre-reduced iron ore high melt production molten iron according to claim 2, it is characterised in that step
Suddenly in (2), the blowing amount of coal dust presses coal ratio=50~300kg/t.
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| CN201910241060.5A CN109929957B (en) | 2019-03-28 | 2019-03-28 | Device and method for producing molten iron by high-temperature smelting of pre-reduced iron ore |
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| CN201910241060.5A CN109929957B (en) | 2019-03-28 | 2019-03-28 | Device and method for producing molten iron by high-temperature smelting of pre-reduced iron ore |
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| CN109929957B CN109929957B (en) | 2020-11-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113151691A (en) * | 2021-04-28 | 2021-07-23 | 东北大学 | Bottom-top composite blowing smelting reduction furnace for treating molten copper slag |
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|---|---|---|---|---|
| CN102925610A (en) * | 2012-10-22 | 2013-02-13 | 西安桃园冶金设备工程有限公司 | Electricity-coal process melting and reduction ironmaking technology |
| CN103773913A (en) * | 2014-01-22 | 2014-05-07 | 辽宁天汇管线材有限公司 | Smelting furnace for smelting reduction |
| CN106119543A (en) * | 2016-07-01 | 2016-11-16 | 北京中凯宏德科技有限公司 | Metallurgical electric furnace and method of smelting |
| WO2018098817A1 (en) * | 2016-12-02 | 2018-06-07 | Tenova S.P.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
-
2019
- 2019-03-28 CN CN201910241060.5A patent/CN109929957B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102925610A (en) * | 2012-10-22 | 2013-02-13 | 西安桃园冶金设备工程有限公司 | Electricity-coal process melting and reduction ironmaking technology |
| CN103773913A (en) * | 2014-01-22 | 2014-05-07 | 辽宁天汇管线材有限公司 | Smelting furnace for smelting reduction |
| CN106119543A (en) * | 2016-07-01 | 2016-11-16 | 北京中凯宏德科技有限公司 | Metallurgical electric furnace and method of smelting |
| WO2018098817A1 (en) * | 2016-12-02 | 2018-06-07 | Tenova S.P.A. | Convertible metallurgical furnace and modular metallurgical plant comprising said furnace for conducting production processes for the production of metals in the molten state, in particualr steel or cast iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113151691A (en) * | 2021-04-28 | 2021-07-23 | 东北大学 | Bottom-top composite blowing smelting reduction furnace for treating molten copper slag |
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