CN108277315B - A kind of device and method using converter gas reducting pellet substitution steel scrap - Google Patents
A kind of device and method using converter gas reducting pellet substitution steel scrap Download PDFInfo
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- CN108277315B CN108277315B CN201710005948.XA CN201710005948A CN108277315B CN 108277315 B CN108277315 B CN 108277315B CN 201710005948 A CN201710005948 A CN 201710005948A CN 108277315 B CN108277315 B CN 108277315B
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- pelletizing
- converter
- gas
- control valve
- flue gas
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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
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The present invention discloses a kind of device and method using converter gas reducting pellet substitution steel scrap, and structure is simple, easy to use and operate, can be improved converter gas sensible heat and the recovery efficiency and use scope of CO；Steel scrap is replaced by the pelletizing restored, converter can be reduced and enter burden cost；The high temperature of pelletizing is added online, can expand additional amount and further reduce the cost；Metallized pellet quality and stable components, process stability contorting easy to produce.
Description
Technical field
The invention belongs to field of steel-making, more particularly to a kind of device using converter gas reducting pellet substitution steel scrap and
Method.
Background technique
In converter steelmaking process, can generate a large amount of ingredients is CO, CO2、N2With a small amount of O2Height of the temperature at 1500 DEG C or so
Warm flue gas.Wherein CO occupancy volume is bigger, accounts about the 60%~85% of total exhaust gas volumn.How the sensible heat of flue gas to be recycled
With utilize the CO as byproduct preferably, be of great significance to realization " negative can " steel-making.At present to obvious heat of smoke
Recycling mainly by RECOVERY OF CONVERTER GAS OG system, the sensible heat of flue gas is within the system to be arranged in the cooling in flue
Water pipe is recycled, and recovery efficiency is not only relatively low, and the receipts heat returned mainly exists with hot water or vapor form, makes
Its utilization scope is narrow.In addition, the CO of recycling is not also utilized directly, cause its utilization efficiency relatively low.In order to mention
The recovery efficiency of high converter gas sensible heat and the utilization efficiency of CO propose the sensible heat for using high-temperature flue gas and in the middle reducibility gas CO
Carry out reducting pellet, be reduced into the high Fe content metallized pellet that degree of metalization reaches 90%, enabling, which becomes replacement, turns
The substitute of furnace steel scrap can not only improve the recovery efficiency of obvious heat of smoke, while being produced into for converter can also be greatly reduced
This.
Currently, its production process of metallized pellet used in converter be mainly pelletizing after low temperature drying with it is a certain proportion of
Reduction coal is mixed, and mixed material is added in reduction stove (such as shaft furnace, rotary kiln, tunnel oven and rotary hearth furnace) and carries out
After reduction, although the metallized pellet of high-grade, high metal rate can be obtained, require additionally to disappear during process implementing
The a large amount of energy is consumed, production cost is increased.In addition, the metallized pellet of above method production, has been when converter is added
Cold conditions can also absorb a large amount of thermal energy in converting process, therefore its additional amount also will receive certain limitation.And utilize converter
Reducing agent of the CO as reducting pellet in flue gas can not only not have to using the sensible heat of flue gas as the condition of reduction reaction
The additional consumption energy, while the utilization efficiency of CO in the recycling and flue gas of obvious heat of smoke can also be improved.After pelletizing metalized
It can be directly added into furnace at high operating temperatures, be that the raising of its additional amount reduces production cost creation more many condition, have
Important economic benefit and social benefit.
Summary of the invention
In view of the foregoing drawbacks, the technical problem to be solved by the present invention is to propose that a kind of utilization converter gas reducting pellet replaces
For the device and method of steel scrap, it is therefore intended that improve the recovery efficiency and use of converter gas sensible heat and CO under the conditions of low cost
Range reduces converter metal charge cost, to achieve the purpose that energy conservation by this synergy.
In order to achieve the above objectives, present invention employs the following technical solutions: utilizing the tool generated during bessemerizing
There is reproducibility high-temperature flue gas to carry out reduction treatment to pelletizing, obtains can satisfy the metallized pellet for directly entering furnace requirement.
A kind of device using converter gas reducting pellet substitution steel scrap introduces pipe and cigarette from converter flue collector access flue gas
Gas discharge pipe, and air intake control valve and out gas control is arranged in the outlet for the intake and smoke discharge tube for introducing pipe in flue gas respectively
Valve processed；Blower is equipped in smoke discharge tube；Flue gas after air intake control valve, which is introduced into pipe, is equipped with nitrogen introducing tube and nitrogen valve；Cigarette
The other end that gas introduces pipe is connected to pelletizing reduction bed, and the pelletizing reduction bed side is equipped with high-temperature flue gas surge chamber, flue gas
Pipe is introduced to be connected to high-temperature flue gas surge chamber；Pelletizing restores the bed other side and is equipped with outlet valve, and outlet valve is connected with discharge piping, puts
The other end of outlet pipe is connected with bucket is summarized, and summarizes bucket and is connected with scale hooper, scale hooper is connected with conveyance conduit；Pelletizing restores under bed
Portion is equipped with reducing gas channel, and the flue gas of high-temperature flue gas surge chamber enters reducing gas channel, and upper part of channel is equipped with grate plate, grate plate
Top is equipped with pelletizing reduction cell；Pelletizing restore bed top be equipped with flared distribution device, the distribution device can pelletizing also
It is slid left and right within the scope of former slot length；Grate plate lower part is equipped with vibration device close to outlet valve side, and the other side is equipped with lifting
Device.
3~5, the reducing gas channel.
Grate plate is jacked up 30~45 ° by the lifting device.
The inner surface that the flue gas introduces pipe, smoke discharge tube and pelletizing reduction bed is designed with 30~50mm high temperature resistant guarantor
Warm layer, high-temperature-resistant thermal-insulation layer are applied on netted gusset.
A kind of restoring method of the device using converter gas reducting pellet substitution steel scrap, includes the following steps:
1) it closes flue gas and is introduced into the leaving air control valve in air intake control valve and smoke discharge tube in pipe；
2) when pelletizing mixing, it is desirable that the diameter control of pelletizing is mixed with 10~20mm and 1 in 10~20mm in pelletizing
The different coal dust of two kinds of thicknesses of~3mm；Wherein, fine breeze first has in pelletizing before being mixed into pelletizing by water and pelletizing matter
Then amount is mixed into coal dust and pellet quality than the ratio for 1:100~200 above-mentioned than being that the ratio of 1:80~100 sprays into water
Fine breeze, above-mentioned rough coal powder is finally mixed into than the ratio for 1:300~500 in coal dust and pellet quality；When pelletizing cloth,
It will need the pelletizing for heating reduction that the pelletizing mixed is added to pelletizing reduction by the distribution device that pelletizing restores bed top
In slot；
3) open nitrogen valve and be passed through nitrogen into air inlet pipe, at the same by leaving air control valve be adjusted to external communicating state,
Guarantee for air existing between air intake control valve and leaving air control valve to be discharged；
4) first leaving air control valve is closed, then again closes nitrogen valve；
5) after converter opens and blows 3~6min, air intake control valve is opened, while blower being started, opens leaving air control valve,
It is adjusted to and converter flue communicating state；
6) adjust blower revolving speed come be adjusted into pelletizing reduction bed exhaust gas volumn, make high-temperature flue gas be introduced into reduction bed with
After the pelletizing contact of low temperature, flue-gas temperature drops to 1000~1300 DEG C；
7) after reduction reaction, air intake control valve and blower are closed, opens nitrogen valve, pelletizing is restored into the high temperature in bed
After flue gas discharges into converter flue, leaving air control valve is closed；
8) outlet valve is opened, and starts lifting device, the one end that will restore the grate plate of bed jacks up, while starting vibration dress
It sets, is collected the metallized pellet restored in collection bucket by drainage conduit；
9) after converter is blended into molten iron, as needed with addition of metallized pellet amount, be put into from collection bucket into scale hooper
Pelletizing, and metallized pellet is put into converter by conveyance conduit.
Described in step 2) when pelletizing cloth, first need to sprinkle one layer of lime powder on grate plate surface.
It is 90~95% that metal rate, which can be obtained, by the above method, and temperature can satisfy at 500~700 DEG C instead of steel scrap
Metallized pellet.
The configuration of the present invention is simple, it is easy to use and operate, it can obtain as follows and turn the utility model has the advantages that 1) can be improved through the invention
The recovery efficiency and use scope of kiln gas sensible heat and CO；2) steel scrap is replaced by the pelletizing restored, converter can be reduced and enter furnace charge
Cost；3) high temperature of pelletizing is added online, can expand additional amount and further reduce the cost；4) metallized pellet quality and ingredient
Stablize, process stability contorting easy to produce.
Detailed description of the invention
Fig. 1 is the schematic device that steel scrap is substituted using converter gas reducting pellet；
Fig. 2 pelletizing restores bed structure schematic diagram；
The netted gusset schematic diagram of Fig. 3；
Fig. 4 present apparatus siding schematic cross-section；
In figure, 1- converter flue collector；2 smoke discharge tubes；3- blower；4- pelletizing restores bed；5- outlet valve；6- drainage conduit；
7- collection bucket；8- scale hooper；9- delivery pipe；10- vibration device；11- lifting device；12- nitrogen valve；13- air intake control valve；
14- flue gas introduces pipe；15- pelletizing material；16- leaving air control valve；17- distribution device；18- surge chamber；19- reducing gas is logical
Road；20- grate plate；21- pelletizing reduction cell, the netted gusset of 22-, 23- high-temperature-resistant thermal-insulation layer, 24- steel shell.
Specific embodiment
Below with reference to embodiment, the present invention is described in detail.
It is mounted on 17 meters of platforms of converter using the device of converter high-temperature flue gas reducting pellet, the device is by distribution device
17, pelletizing reduction bed 4, flue gas introduce pipe 14, smoke discharge tube 2 is constituted, and structural schematic diagram is as shown in Figure 1.Wherein, flue gas draws
The internal diameter for entering pipe 14 is 800mm, and one end is connect with converter flue collector 1, and the other end is connect with pelletizing reduction bed 4, is introduced in flue gas
The left end of pipe 14 is equipped with air intake control valve 13, and nitrogen valve 12 is equipped on the right side of it.In order to enable flue gas smoothly from the main cigarette of converter
It is drawn in road 1, blower 3 is equipped in smoke discharge tube 2.It can adequately be restored convenient for pelletizing, pelletizing reduction bed 4 is carried out
Such as the design of Fig. 2, the high-temperature flue gas introduced in converter flue 1 introduces pipe 14 by flue gas and is transported to pelletizing reduction bed 4
High-temperature flue gas surge chamber 18 in, then high-temperature flue gas enter back into pelletizing reduction 4 lower part of bed reducing gas channel 19 in, also
Raw gas channels are equipped with 3, and upper part is equipped with grate plate 20, are designed with pelletizing reduction cell 21 in each reducing gas upper part of channel,
The high-temperature flue gas into channel can be made to enter in the pelletizing being reduced by grate plate, realize the reducing metal Hua Chu to pelletizing
Reason.It is equipped with flared distribution device 17 at the top of pelletizing reduction bed 4, which can be in 21 length of pelletizing reduction cell
It is slid left and right in range, realizes uniform distribution.Hydraulic lifting is equipped in the grate plate 20 of 21 left lower of pelletizing reduction cell
Grate plate can be jacked up 35 °, be equipped with hydraulic vibration device 10 on the right side of it, it can be achieved that vibration to grate plate 20 by device 11.In pelletizing
The lower right side for restoring bed 4 is equipped with the hydraulic discharging valve 5 released convenient for pelletizing, can be connected with discharge piping 6 after opening, discharge piping
6 other end is connect with collection bucket 7, is equipped with scale hooper 8 thereunder, and load weighted metallized pellet can pass through scale hooper 8
Metallized pellet can be directly transported in converter by the conveyance conduit 9 of bottom.Pipeline in whole device and reduction bed
Inner surface can be coated with the high-temperature-resistant thermal-insulation layer 23 of 40mm thickness with high-temperature flue gas contact portion.In order to enhance the strong of insulating layer
Degree, prevents from falling off, and is designed with metal inner lining resistant to high temperature in all inner surfaces contacted with high-temperature flue gas and reinforces netted gusset 22,
Its structure is as shown in figures 3 and 4.
In order to make pelletizing carry out metalized, enables to replace steel scrap, achieve the purpose that reduce cost, specifically
Operating method is as follows:
1) it closes flue gas and is introduced into the leaving air control valve 16 in air intake control valve 13 and smoke discharge tube 2 in pipe 14；
2) when pelletizing mixing, the pelletizing of high temperature reduction is mutually bonded together in order to prevent, and also to improve material
Gas permeability, the different coal dust of two kinds of thicknesses of 1.5mm and 20mm is mixed in pelletizing.Wherein, fine breeze is before being mixed into pelletizing,
It first has in pelletizing guarantee that pelletizing surface can glue than spraying into a certain amount of water for the ratio of 1:90 in water and pellet quality
Fine breeze is tied, being then mixed into fine breeze than the ratio for 1:150 in coal dust and pellet quality prevents from occurring during high temperature reduction
Bonding, is finally mixed into rough coal powder than the ratio for 1:350 to improve the gas permeability of material in coal dust and pellet quality.Pelletizing cloth
When, the pelletizing of bottom high temperature bonds grate plate 20 in order to prevent, needs to sprinkle one layer of lime powder on its surface before cloth, then need to
The pelletizing mixed is added to pelletizing reduction cell 21 by the pelletizing elevating hopper 17 on reduction bed top by the pelletizing for heating reduction
In the middle, and by reduction bed sealing is carried out；
3) it opens nitrogen valve 12 and is passed through nitrogen into air inlet pipe, while being adjusted to leaving air control valve 16 to communicate shape with outside
State guarantees the air discharge between air intake control valve 13 and leaving air control valve 16；
4) first leaving air control valve 16 is closed, then again closes nitrogen valve 12；
5) after converter opens and blows 5min, air intake control valve 13 is opened, while blower 3 being started, opens leaving air control valve
16, it is adjusted to and converter flue communicating state；
6) in order to guarantee that it is adhered to one another that reducting pellet surface in high-temperature reaction process neither occurs, while can make to restore again
Rapid reaction carries out, and the revolving speed of adjustable blower 3 is adjusted into the exhaust gas volumn of pelletizing reduction bed, makes 1500 DEG C of high-temperature flue gas
Be introduced into reduction bed contacted with the pelletizing of low temperature after, flue-gas temperature drops to 1250 DEG C.
7) after reduction reaction, air intake control valve 13 and blower are closed, opens nitrogen valve 12, is filled with into reduction bed pre-
The nitrogen of heat simultaneously makes its pressure maintain 1 atmospheric pressure, after the high-temperature flue gas restored in bed is discharged into converter flue, closes outlet
Control valve 16；
8) outlet valve 5 is opened, and starts hydraulic lift 11, the one end that will restore the grate plate 20 of bed jacks up 35 °, simultaneously
Starting, which is located at grate plate, prevents 5 putty of outlet valve, the metal that will have been restored by drainage conduit 6 close to the vibration device 10 of discharge valve side
Pellet is collected in pelletizing collection bucket 7；
9) after converter is blended into molten iron, as needed with addition of metallized pellet amount, put from collection bucket 7 into scale hooper 8
Enter pelletizing, and metallized pellet is put into converter by conveyance conduit 9.
Pelletizing of the invention is as shown in the table using its composition range of magnesia pelletizing.
Claims (6)
1. a kind of device using converter gas reducting pellet substitution steel scrap, it is characterised in that: access flue gas from converter flue collector
Pipe and smoke discharge tube are introduced, and the outlet setting air inlet for introducing the intake and smoke discharge tube of pipe in flue gas respectively controls
Valve and leaving air control valve；Blower is equipped in smoke discharge tube；Flue gas after air intake control valve, which is introduced into pipe, is equipped with nitrogen introducing tube
And nitrogen valve；The other end that flue gas introduces pipe is connected to pelletizing reduction bed, and the pelletizing reduction bed side is equipped with high-temperature flue gas
Surge chamber, flue gas introduce pipe and are connected to high-temperature flue gas surge chamber；Pelletizing restores the bed other side and is equipped with outlet valve；Outlet valve and releasing
Pipe is connected, and the other end of discharge piping is connected with bucket is summarized, and summarizes bucket and is connected with scale hooper, scale hooper is connected with conveyance conduit；Ball
Group's reduction bed lower part is equipped with reducing gas channel, and the flue gas of high-temperature flue gas surge chamber enters reducing gas channel, and upper part of channel is set
There is grate plate, grate plate top is equipped with pelletizing reduction cell；The top that pelletizing restores bed is equipped with flared distribution device, the distribution device
It can be slid left and right in pelletizing reduction cell length range；Grate plate lower part is equipped with vibration device close to outlet valve side, another
Side is equipped with lifting device.
2. utilizing the device of converter gas reducting pellet substitution steel scrap according to claim 1, it is characterised in that: described goes back
Raw gas channels 3~5.
3. utilizing the device of converter gas reducting pellet substitution steel scrap according to claim 1, it is characterised in that: the liter
Grate plate is jacked up 30~45 ° by falling unit.
4. utilizing the device of converter gas reducting pellet substitution steel scrap according to claim 1, it is characterised in that: the cigarette
The inner surface that gas introduces pipe, smoke discharge tube and pelletizing reduction bed is designed with 30~50mm high-temperature-resistant thermal-insulation layer, high-temperature-resistant thermal-insulation
Layer is applied on netted gusset.
5. a kind of device according to any one of claims 1-4 using converter gas reducting pellet substitution steel scrap is gone back
Original method, it is characterised in that include the following steps:
1) it closes flue gas and is introduced into the leaving air control valve in air intake control valve and smoke discharge tube in pipe；
2) when pelletizing mixing, it is desirable that the diameter control of pelletizing in 10~20mm, and be mixed in pelletizing 10~20mm and 1~
The different coal dust of two kinds of thicknesses of 3mm；Wherein, fine breeze first has in pelletizing before being mixed into pelletizing by water and pellet quality
Than spraying into water for the ratio of 1:80~100, then it is mixed into coal dust and pellet quality than the ratio for 1:100~200 above-mentioned
Fine breeze is finally mixed into above-mentioned rough coal powder than the ratio for 1:300~500 in coal dust and pellet quality；When pelletizing cloth, lead to
The pelletizing mixed is added in pelletizing reduction cell by the distribution device for crossing pelletizing reduction bed top；
3) it opens nitrogen valve and is passed through nitrogen into air inlet pipe, while leaving air control valve being adjusted to and external communicating state, guarantee
Air existing between air intake control valve and leaving air control valve can be discharged；
4) first leaving air control valve is closed, then again closes nitrogen valve；
5) after converter opens and blows 3~6min, air intake control valve is opened, while blower being started, opens leaving air control valve, adjustment
To with converter flue collector communicating state；
6) revolving speed of blower is adjusted to be adjusted into the exhaust gas volumn of pelletizing reduction bed, and high-temperature flue gas is made to be introduced into reduction bed and low temperature
Pelletizing contact after, flue-gas temperature drops to 1000~1300 DEG C；
7) after reduction reaction, air intake control valve and blower are closed, opens nitrogen valve, pelletizing is restored into the high-temperature flue gas in bed
After discharging into converter flue, leaving air control valve is closed；
8) outlet valve is opened, and starts lifting device, the one end that will restore the grate plate of bed jacks up, while starting vibration device, leads to
Drainage conduit is crossed to collect the metallized pellet restored in collection bucket；
9) after converter is blended into molten iron, as needed with addition of metallized pellet amount, pelletizing is put into scale hooper from collection bucket,
And metallized pellet is put into converter by conveyance conduit.
6. the restoring method of the device according to claim 5 using converter gas reducting pellet substitution steel scrap, feature
It is: described in step 2) when pelletizing cloth, first needs to sprinkle one layer of lime powder on grate plate surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710005948.XA CN108277315B (en) | 2017-01-05 | 2017-01-05 | A kind of device and method using converter gas reducting pellet substitution steel scrap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710005948.XA CN108277315B (en) | 2017-01-05 | 2017-01-05 | A kind of device and method using converter gas reducting pellet substitution steel scrap |
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| Publication Number | Publication Date |
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| CN108277315A CN108277315A (en) | 2018-07-13 |
| CN108277315B true CN108277315B (en) | 2019-06-28 |
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| CN201710005948.XA Active CN108277315B (en) | 2017-01-05 | 2017-01-05 | A kind of device and method using converter gas reducting pellet substitution steel scrap |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109880961B (en) * | 2019-03-26 | 2020-07-17 | 东北大学 | Composite system and method for treating converter flue gas and reducing all-vanadium-titanium pellets |
| CN113005252B (en) * | 2021-02-26 | 2022-04-15 | 东北大学 | Rotary hearth furnace device and method for reducing carbon-containing pellets |
| CN115125359B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method and system for steelmaking by hot charging and hot feeding of metallized pellets of rotary hearth furnace |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3244744A1 (en) * | 1982-11-25 | 1984-05-30 | Klöckner-Werke AG, 4100 Duisburg | Process for the direct reduction of iron ore in a shaft furnace |
| CN201206933Y (en) * | 2007-03-16 | 2009-03-11 | 大连熔融还原设备制造有限公司 | Drying furnace for metallized pellet |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57143422A (en) * | 1981-03-02 | 1982-09-04 | Nippon Steel Corp | Treatment for waste gas of noncombustion type converter |
-
2017
- 2017-01-05 CN CN201710005948.XA patent/CN108277315B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3244744A1 (en) * | 1982-11-25 | 1984-05-30 | Klöckner-Werke AG, 4100 Duisburg | Process for the direct reduction of iron ore in a shaft furnace |
| CN201206933Y (en) * | 2007-03-16 | 2009-03-11 | 大连熔融还原设备制造有限公司 | Drying furnace for metallized pellet |
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