CN109055643A - A kind of coal gas shaft furnace system and iron smelting method based on induction supplementary heating structure - Google Patents
A kind of coal gas shaft furnace system and iron smelting method based on induction supplementary heating structure Download PDFInfo
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- CN109055643A CN109055643A CN201811217336.8A CN201811217336A CN109055643A CN 109055643 A CN109055643 A CN 109055643A CN 201811217336 A CN201811217336 A CN 201811217336A CN 109055643 A CN109055643 A CN 109055643A
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- shaft furnace
- furnace
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- intermediate frequency
- shaft
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0073—Selection or treatment of the reducing gases
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The present invention relates to a kind of coal gas shaft furnace systems and iron smelting method based on induction supplementary heating structure, and coal gas shaft furnace system includes: the coal gas system for being used to prepare and purifying reducing gas, the heating furnace for being heated to reducing gas；Carrying iron-bearing material and the shaft furnace for being used to carry out direct-reduction technique；The bustle pipe for being passed through gas is provided with outside shaft furnace, the reducing gas of coal gas system preparation is passed through shaft furnace by bustle pipe after heating stove heating；The Intermediate Frequency Induction Heating Equipment heated to the iron-bearing material of carrying is used in the middle part of the shaft of shaft furnace；The furnace roof of shaft furnace is connected to by pipeline with secondary cycle purification device, is mixed into heating furnace by the gas of secondary cycle purification device and the reducing gas of coal gas system outlet.The present invention can be improved reduction reaction speed, improve shaft furnace production rate, and can reduce the dosage of reducing gas, improve shaft furnace yield, save production cost.
Description
Technical field
The present invention relates to shaft kiln directly reduced field of metallurgy more particularly to a kind of coals based on induction supplementary heating structure
Gas shaft furnace system and iron smelting method.
Background technique
Gas-based shaft kiln directly reduced technique is referred to and is restored iron ore or acid pellet using gaseous reducing agent in shaft furnace
At the method for metallic iron.DRI-EAF short route is compared with BF-BOF process, and gas-based shaft kiln+eaf process is than blast furnace+converter process
Reduce CO2Discharge 32%, gas-based shaft kiln+eaf process reduce SO than blast furnace+converter process2Discharge 74%, gas-based shaft kiln+electric furnace
Technique reduces NOx emission 62% than blast furnace+converter process, and (30% shaft kiln directly reduced iron and 70% steel scrap+electric furnace) is than (blast furnace
+ converter) reduce energy consumption 61%.Therefore non-blast furnace short route ironmaking is the direction of China's steel industry energy-saving and emission-reduction Green Development.
But during gas-based shaft kiln prepares DRI, it is only 600m that iron content pelletizing reduction process, which consumes coal gas,3/ tDRI, but
Gas-based shaft kiln actually uses 1800m3The coal gas of/tDRI is to bring the heat that reduction is required enough into.For this purpose, how to improve
Above-mentioned technique becomes the current technical issues that need to address.
Summary of the invention
(1) technical problems to be solved
In order to solve the above problem of the prior art, a kind of the present invention provides structures simple, the efficient base of heating efficiency
In the coal gas shaft furnace system and iron smelting method of induction supplementary heating structure.
(2) technical solution
In order to achieve the above object, the present invention provides a kind of coal gas shaft furnace system based on induction supplementary heating structure, packet
It includes:
It is used to prepare and purifies the coal gas system of reducing gas,
Heating furnace for being heated to reducing gas；
Carrying iron-bearing material and the shaft furnace for being used to carry out direct-reduction technique；
The bustle pipe for being passed through gas is provided with outside shaft furnace, the reducing gas of the coal gas system preparation passes through heating furnace
Shaft furnace is passed through by bustle pipe after heating；
The Intermediate Frequency Induction Heating Equipment heated to the iron-bearing material in shaft furnace is provided in the middle part of the shaft of the shaft furnace；
The furnace roof of the shaft furnace is connected to by pipeline with secondary cycle purification device, by the gas of secondary cycle purification device
Body is passed through heating furnace, and mixes with the reducing gas of the coal gas system outlet and be passed through the bustle pipe.
Optionally, the Intermediate Frequency Induction Heating Equipment is located at the furnace body reduction section of the shaft furnace, and is in reduction section height
From bottom to top at the position 0.3-0.6 in direction.
Optionally, Intermediate Frequency Induction Heating Equipment is connect with the control device of the shaft furnace, and the control device is according to described in
The temperature of raw material adjusts the induced current of the Intermediate Frequency Induction Heating Equipment in shaft furnace.
Optionally, Intermediate Frequency Induction Heating Equipment includes:
Intermediate frequency power supply generator splits induction coil in shaft furnace two sides；Coil sealing cover；
The intermediate frequency power supply generator is connect with induction coil, and is arranged in the coil sealing cover；
The bustle pipe is located at the lower section of the coil sealing cover and mutually indepedent, in the coil sealing cover and the bustle pipe
It is provided with outside for the frame body with air insulated.
Optionally, in the shaft furnace refractory material used in region corresponding with the Intermediate Frequency Induction Heating Equipment and its
Refractory material used in its region is different；
And/or refractory material used in region corresponding with the Intermediate Frequency Induction Heating Equipment is oxygen in the shaft furnace
Change magnesium or aluminium oxide.
Optionally, the induction coil is obtained using naked copper hollow pipe coiling, and coil turn makes away from consistent structure
Water flowing is cooling in the naked copper hollow pipe described in.
The coil sealing cover is stainless steel material preparation, and is passed through nitrogen in the coil sealing cover and sends out intermediate frequency power supply
Raw device is protected with induction coil.
Second aspect, the present invention also provides a kind of iron smelting method based on any of the above-described coal gas shaft furnace system, packets
It includes:
S1, it carries out being heated to 850-900 DEG C by heating furnace in the reducing gas of the generation of coal gas system, by bustle pipe
It is passed through shaft furnace；
S2, starting Intermediate Frequency Induction Heating Equipment, so that the pelletizing temperature of shaft furnace inner part metallization is rapidly achieved 850-900
℃；
Pelletizing is reacted with reducing gas in S3, shaft furnace, and the gas of reduction reaction generation and/or reducing gas pass through
The pipeline discharge of furnace roof connection, and purified in the gas secondary cycle purification device being discharged, and be passed through heating after cleaning
Furnace is recycled.
Optionally, the S1 includes:
It is placed with fine coal in the coal gasifier of coal gas system, and is passed through oxygen and vapor, so that the synthesis gas of output
H2It is 1.2-1.7 with CO molar ratio.
Optionally, the S1 includes:
After the purified structure desulfurization of the synthesis gas of the output, de- benzene, de- naphthalene, CO and H in obtained gas2Total content exists
90% or more, H2The unit of/CO > 1.5 is molar ratio, (CO+H2+CH4)/(CO2+H2O) > 10 unit is molar ratio, H2S<10mg/
m3。
Optionally, before step S2, the method also includes:
S0, the iron-bearing material of iron ore and/or acid pellet is added in shaft furnace from shaft furnace furnace roof position.
(3) beneficial effect
The beneficial effects of the present invention are:
Using the shaft kiln directly reduced work of coal gas of Intermediate Frequency Induction Heating Equipment induction supplementary heating in iron smelting method of the present invention
The ironmaking equipment of skill, can save reduction shaft furnace circulating gas amount 20% or so, and induction heating uses 1400m3/ tDRI, 900 DEG C
Reducing gas can achieve and 1800m3/ tDRI obtains the product of same metal rate equivalent, or obtains 20-30%DRI volume increase
Effect improves labor productivity and capacity utilization.
Detailed description of the invention
Fig. 1 is a kind of coal gas shaft furnace system schematic based on induction supplementary heating structure provided by the invention.
Specific embodiment
In order to preferably explain the present invention, in order to understand, with reference to the accompanying drawing, by specific embodiment, to this hair
It is bright to be described in detail.
Embodiment one
The present invention provides a kind of coal gas shaft furnace system based on induction supplementary heating structure, comprising:
It is used to prepare and purifies the coal gas system of reducing gas,
Heating furnace for being heated to reducing gas；
Carrying iron-bearing material and the shaft furnace for being used to carry out direct-reduction technique；
The bustle pipe for being passed through gas is provided with outside shaft furnace, the reducing gas of the coal gas system preparation passes through heating furnace
Shaft furnace is passed through by bustle pipe after heating；
The Intermediate Frequency Induction Heating Equipment heated to the iron-bearing material of carrying is used in the middle part of the shaft of the shaft furnace；
The furnace roof of the shaft furnace passes through pipeline and secondary cycle purification device (dedusting dehydration as shown in figure 1, pressurized circulation etc.
Structure) connection, it is mixed into and adds by the gas of secondary cycle purification device and the reducing gas of the coal gas system outlet
Hot stove.
The Intermediate Frequency Induction Heating Equipment is located at the furnace body reduction section of the shaft furnace, and from bottom to top in reduction section height
At the position 0.3-0.6 in direction.That is, reduction section is divided into 10 sections, induction heating equipment is at 3-6 section from bottom to top.
In specific implementation, Intermediate Frequency Induction Heating Equipment is connect with the control device of the shaft furnace, the control device according to
The induced current of the Intermediate Frequency Induction Heating Equipment is adjusted according to the temperature of raw material in the shaft furnace.
Shown in Figure 1, the Intermediate Frequency Induction Heating Equipment of the present embodiment includes: intermediate frequency power supply generator, induction coil；Line
Enclose sealing cover；The intermediate frequency power supply generator is connect with induction coil, and is arranged in the coil sealing cover.The bustle pipe
Positioned at the lower section of the coil sealing cover and mutually indepedent, be provided with outside the coil sealing cover and the bustle pipe for sky
Air bound from frame body.
In addition, the induction coil in the present embodiment can be obtained using naked copper hollow pipe coiling, coil turn is away from consistent
Structure, water flowing is cooling in the naked copper hollow pipe in use.
The coil sealing cover is stainless steel material preparation, and is passed through nitrogen in the coil sealing cover and sends out intermediate frequency power supply
Raw device is protected with induction coil.
It illustrates, the gas that heating furnace is passed through in Fig. 1 also needs purification system to carry out purified treatment.
Intermediate Frequency Induction Heating Equipment induction supplementary heating can be used in ironmaking processes in the coal gas shaft furnace system of the present embodiment
Coal gas Shaft Furnace Direct Reduction Process ironmaking equipment, reduction shaft furnace circulating gas amount 20% or so can be saved, induction heating makes
Use 1400m3/ tDRI, 900 DEG C of reducing gas can achieve and 1800m3/ tDRI obtains the product of same metal rate equivalent,
Or 20-30%DRI effect of increasing production is obtained, improve labor productivity and capacity utilization.
Embodiment two
The embodiment of the present invention also provides a kind of iron smelting method based on above-mentioned any coal gas shaft furnace system, comprising:
S1, it carries out being heated to 850-900 DEG C by heating furnace in the reducing gas of the generation of coal gas system, by bustle pipe
It is passed through shaft furnace.
In a particular application, it is placed with fine coal in the coal gasifier of coal gas system, and is passed through oxygen and vapor, so that
The H of the synthesis gas of output2It is 1.2-1.7 with CO molar ratio.
After the purified structure desulfurization of the synthesis gas of the output, de- benzene, de- naphthalene, CO and H in obtained gas2Total content exists
90% or more, H2/ CO > 1.5, (CO+H2+CH4)/(CO2+H2O) > 10, H2S<10mg/m3, above-mentioned unit is molar ratio.
S2, starting Intermediate Frequency Induction Heating Equipment, so that the pelletizing temperature of shaft furnace inner part metallization is rapidly achieved 850-900
℃。
It should be noted that before executing step S2, need the iron-bearing material of iron ore and/or acid pellet from shaft furnace
Furnace roof position is added in shaft furnace.
Pelletizing is reacted with reducing gas in S3, shaft furnace, and the gas of reduction reaction generation and/or reducing gas pass through
The pipeline discharge of furnace roof connection, and purified in the gas secondary cycle purification device being discharged, and be passed through heating after cleaning
Furnace is recycled.
Specifically, as shown in Figure 1, including coal gas system, it is placed with fine coal in coal gasifier, and be passed through oxygen and water
Steam, by adjusting the ratio of oxygen and vapor, so that the H of the synthesis gas of output2It is 1.2-1.7 with CO molar ratio.Coal dust
In can be mixed into the dolomite dust of 10%wt or so, for reducing the sulfur content in synthesis gas.Fluidized bed coal gasifier is (i.e.
Coal gas steam stove above-mentioned) interior operating pressure is 0.3-0.6Mpa, the synthesis gas temperature of generation is higher up to 980 DEG C, the furnace of generation
Slag can regard the raw material in cement plant.Obtained synthesis gas, is passed through in purification system, after heat exchange, dedusting, purification, abjection
The impurity such as sulphur, benzene, naphthalene in coal gas obtain going back the reducing gas that Primordial Qi requires needed for meeting shaft furnace.That is reducing gas ingredient CO
With H2Total content is in 90% or more, H2/ CO > 1.5, (CO+H2+CH4)/(CO2+H2O) > 10, H2S<10mg/m3。
It is provided with iron ore and/or acid pellet in Fig. 1 in shaft furnace (i.e. gas-based shaft kiln), the iron-bearing material is from vertical furnace
Top is added.
Intermediate Frequency Induction Heating Equipment is used at reduction shaft furnace the section from bottom to top 0.3-0.6 of height.Induction heating equipment
Essential structure is as described below: since shaft furnace furnace roof, shaft position have compared with multi-part, coil cannot directly be assembled to furnace from furnace roof
In the middle part of body, the present invention is also distributed using a kind of novel electromagnetic induction heating coil, induction coil in addition to using electromagnetic induction coil
It is divided into two parts and splits shaft furnace two sides, electromagnetic induction relevant device is assemblied in coil sealing cover, and electromagnetic induction device lower part is
Bustle pipe, mutually indepedent between the two but outside are sealed by big frame.In addition, refractory material used in the shaft furnace of electromagnetic induction device part
(refractory brick as shown in figure 1) is different from shaft furnace other parts, selects the refractory materials such as magnesia or aluminium oxide.
The heating power needed in order to obtain, it is very big for flowing through the electric current of inductor, so that the electricity damage in inductor
The 20-30% that can reach active power is lost, this partial loss is converted into high amount of sensible heat, in addition being passed through by being melt metal
The heat that furnace lining transmits allows for that forcing functions must be carried out to inductor under normal circumstances.Therefore, this electromagnetic induction device
It is that it is cooling to manage interior water flowing made of hollow copper tubing.
The insulation performance of induction coil is the key that determine one of sensing apparatus service life, and insulation processing of the invention is simpler
It is reliable: induction coil use the coiling of naked copper pipe, every circle coil all in position on weld support screw, with heat-resisting hardwood will
Coil support is secured；In addition, on coil then local cushioning insulation is carried out at mass-impregnation with guaranteeing pitch of turn uniformity
Reason, makes coil form firm entirety, is easy to lift, and is also beneficial to improve furnace life.
In small-sized stove, because not having to magnetic yoke, to prevent leakage field beam from furnace shell being made to generate heat, it is necessary to use stainless steel, aluminium or copper
Equal non-magnetic conductive materials manufacture coil recess and sealing cover, the present invention select stainless steel material to manufacture coil sealing cover.Online
N is passed through in circle sealing cover2To electromagnetic induction coil seal protection, while thermometric galvanic couple is configured, uses electromagnetic induction heating intelligence
Control technology, charge-temperature and induced current adapt to adjust according to feedback temperature, reach Control for Kiln Temperature is appropriate, pelletizing does not cohere,
Stable, high-yielding effect.
After mid-frequency induction heating, partially metallised pelletizing is made to be rapidly heated to 850-900 DEG C, in furnace reduction
Reduction obtains product direct reduced iron rapidly under atmosphere.
Restore the CO generated2、H2Remaining reducing gas is discharged from furnace roof position in the gases such as O and furnace, part stock gas
After dehydration dust pelletizing system dehydration dust-collecting and heat exchanging, then the pressurization of pressurized pump is mixed with purifying and dedusting coal gas and is passed through as reducing gas
Gas-based shaft kiln；Part stock gas is used as the fuel gas of heating furnace.
Finally, it should be noted that above-described embodiments are merely to illustrate the technical scheme, rather than to it
Limitation；Although the present invention is described in detail referring to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to part of or all technical features into
Row equivalent replacement；And these modifications or substitutions, it does not separate the essence of the corresponding technical solution various embodiments of the present invention technical side
The range of case.
Claims (10)
1. a kind of coal gas shaft furnace system based on induction supplementary heating structure characterized by comprising be used to prepare and purify also
The coal gas system of rough gas,
Heating furnace for being heated to reducing gas；
Carrying iron-bearing material and the shaft furnace for being used to carry out direct-reduction technique；
The bustle pipe for being passed through gas is provided with outside shaft furnace, the reducing gas of the coal gas system preparation is by heating stove heating
Shaft furnace is passed through by bustle pipe afterwards；
The Intermediate Frequency Induction Heating Equipment heated to the iron-bearing material in shaft furnace is provided in the middle part of the shaft of the shaft furnace；
The furnace roof of the shaft furnace is connected to by pipeline with secondary cycle purification device, logical by the gas of secondary cycle purification device
Enter heating furnace, and is mixed with the reducing gas of the coal gas system outlet and be passed through the bustle pipe.
2. system according to claim 1, which is characterized in that the Intermediate Frequency Induction Heating Equipment is located at the furnace of the shaft furnace
Body reduction section, and at reduction section the height from bottom to top position 0.3-0.6 in direction.
3. system according to claim 1 or 2, which is characterized in that the control of Intermediate Frequency Induction Heating Equipment and the shaft furnace
Device connection, the control device adjust the induced electricity of the Intermediate Frequency Induction Heating Equipment according to the temperature of raw material in the shaft furnace
Stream.
4. system according to claim 1 or 2, which is characterized in that Intermediate Frequency Induction Heating Equipment includes:
Intermediate frequency power supply generator splits induction coil in shaft furnace two sides；Coil sealing cover；
The intermediate frequency power supply generator is connect with induction coil, and is arranged in the coil sealing cover；
The bustle pipe is located at the lower section of the coil sealing cover and mutually indepedent, in the coil sealing cover and the bustle pipe peripheral hardware
It is equipped with for the frame body with air insulated.
5. system according to claim 1 or 2, which is characterized in that
Refractory material used in region corresponding with the Intermediate Frequency Induction Heating Equipment is made with other regions in the shaft furnace
Refractory material is different；
And/or refractory material used in region corresponding with the Intermediate Frequency Induction Heating Equipment is magnesia in the shaft furnace
Or aluminium oxide.
6. system according to claim 4, which is characterized in that the induction coil is to be obtained using naked copper hollow pipe coiling
, coil turn is away from consistent structure, and water flowing is cooling in the naked copper hollow pipe in use；
The coil sealing cover is stainless steel material preparation, and is passed through nitrogen to intermediate frequency power supply generator in the coil sealing cover
It is protected with induction coil.
7. a kind of iron smelting method based on any coal gas shaft furnace system of claim 1 to 6 characterized by comprising
S1, it carries out being heated to 850-900 DEG C by heating furnace in the reducing gas of the generation of coal gas system, be passed through by bustle pipe
Shaft furnace；
S2, starting Intermediate Frequency Induction Heating Equipment, so that the pelletizing temperature of shaft furnace inner part metallization is rapidly achieved 850-900 DEG C；
Pelletizing is reacted with reducing gas in S3, shaft furnace, and the gas of reduction reaction generation and/or reducing gas pass through furnace roof
The pipeline of connection is discharged, and is purified in the gas secondary cycle purification device being discharged, and be passed through heating furnace after cleaning and follow
Ring uses.
8. the method according to the description of claim 7 is characterized in that the S1 includes:
It is placed with fine coal in the coal gasifier of coal gas system, and is passed through oxygen and vapor, so that the H of the synthesis gas of output2With
CO molar ratio is 1.2-1.7.
9. according to the method described in claim 8, it is characterized in that, the S1 includes:
After the purified structure desulfurization of the synthesis gas of the output, de- benzene, de- naphthalene, CO and H in obtained gas2Total content is 90%
More than, H2The unit of/CO > 1.5 is molar ratio,
(CO+H2+CH4)/(CO2+H2O) > 10 unit is molar ratio, H2S<10mg/m3。
10. according to the method described in claim 5, it is characterized in that, before step S2, the method also includes:
S0, the iron-bearing material of iron ore and/or acid pellet is added in shaft furnace from shaft furnace furnace roof position.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217336.8A CN109055643A (en) | 2018-10-18 | 2018-10-18 | A kind of coal gas shaft furnace system and iron smelting method based on induction supplementary heating structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811217336.8A CN109055643A (en) | 2018-10-18 | 2018-10-18 | A kind of coal gas shaft furnace system and iron smelting method based on induction supplementary heating structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913606A (en) * | 2019-03-27 | 2019-06-21 | 东北大学 | A kind of coal hydrogen shaft furnace ironmaking system and technique based on induction heating |
| CN112899427A (en) * | 2021-01-15 | 2021-06-04 | 东北大学 | Hydrogen shaft furnace iron making system and method using electric energy for heating |
| CN114381564A (en) * | 2021-04-15 | 2022-04-22 | 北京华浦博科技有限公司 | Direct reduction device for heating iron concentrate powder by isolating air and application thereof |
| CN114798136A (en) * | 2022-04-20 | 2022-07-29 | 中南大学 | Process and device for efficiently utilizing complex iron-containing resources by reduction-grinding separation method |
| WO2023030366A1 (en) * | 2021-09-01 | 2023-03-09 | 中国石油大学(北京) | Method for producing negative carbon reduced iron synthesis gas and method for producing reduced iron by gas-based shaft furnace |
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| CN101603132A (en) * | 2009-07-16 | 2009-12-16 | 钢铁研究总院 | A kind of method and apparatus of production VN alloy |
| CN102304599A (en) * | 2011-09-22 | 2012-01-04 | 中冶赛迪上海工程技术有限公司 | Method and device for producing direct reduced iron by using gas-based reduction shaft furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101603132A (en) * | 2009-07-16 | 2009-12-16 | 钢铁研究总院 | A kind of method and apparatus of production VN alloy |
| CN102304599A (en) * | 2011-09-22 | 2012-01-04 | 中冶赛迪上海工程技术有限公司 | Method and device for producing direct reduced iron by using gas-based reduction shaft furnace |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109913606A (en) * | 2019-03-27 | 2019-06-21 | 东北大学 | A kind of coal hydrogen shaft furnace ironmaking system and technique based on induction heating |
| CN112899427A (en) * | 2021-01-15 | 2021-06-04 | 东北大学 | Hydrogen shaft furnace iron making system and method using electric energy for heating |
| CN112899427B (en) * | 2021-01-15 | 2022-02-11 | 东北大学 | Hydrogen shaft furnace iron making system and method using electric energy for heating |
| CN114381564A (en) * | 2021-04-15 | 2022-04-22 | 北京华浦博科技有限公司 | Direct reduction device for heating iron concentrate powder by isolating air and application thereof |
| CN114381564B (en) * | 2021-04-15 | 2024-04-30 | 北京华浦博科技有限公司 | Direct reduction device for insulating air and heating iron concentrate powder and application thereof |
| WO2023030366A1 (en) * | 2021-09-01 | 2023-03-09 | 中国石油大学(北京) | Method for producing negative carbon reduced iron synthesis gas and method for producing reduced iron by gas-based shaft furnace |
| CN114798136A (en) * | 2022-04-20 | 2022-07-29 | 中南大学 | Process and device for efficiently utilizing complex iron-containing resources by reduction-grinding separation method |
| CN114798136B (en) * | 2022-04-20 | 2023-08-08 | 中南大学 | Process and device for efficiently utilizing complex iron-containing resources by reduction-grinding separation method |
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Application publication date: 20181221 |