CN108611452A - A kind of blast furnace slag granulation and waste-heat recovery device and method - Google Patents
A kind of blast furnace slag granulation and waste-heat recovery device and method Download PDFInfo
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- CN108611452A CN108611452A CN201810237987.7A CN201810237987A CN108611452A CN 108611452 A CN108611452 A CN 108611452A CN 201810237987 A CN201810237987 A CN 201810237987A CN 108611452 A CN108611452 A CN 108611452A
- Authority
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- China
- Prior art keywords
- blast furnace
- slag
- furnace slag
- waste
- granulation
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B3/00—General features in the manufacture of pig-iron
- C21B3/04—Recovery of by-products, e.g. slag
- C21B3/06—Treatment of liquid slag
- C21B3/08—Cooling slag
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]
-
- 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
-
- 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
- Y02P10/25—Process efficiency
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
Abstract
The invention discloses a kind of blast furnace slag granulation and waste-heat recovery device and methods; the device includes blast furnace slag granulation mechanism, and described device further includes the humidifier of the grain slag atomization water cooling for being thrown away to blast furnace slag granulation mechanism and the waste heat recovering mechanism for fluidizing and the methane after heat exchange being made to be reacted with the vapor after atomization and vaporization the grain slag after atomization water cooling with the methane of importing.The present invention, which can allow, contains more vitreum in granulated bf slag so that all meets the technological requirement of follow-up cement manufacture in granulated bf slag either granularity or ingredient；And enough produce clean energy resource using its waste heat energy.
Description
Technical field
The invention belongs to technical field of blast furnace ironmaking, and in particular to a kind of blast furnace slag granulation and waste-heat recovery device and side
Method.
Background technology
Blast furnace, which often produces 1t molten iron, can generate the blast furnace slag of about 300kg.And the tapping temperature of liquid blast furnace is about
1450 DEG C~1550 DEG C, be the sensible heat resource of high-quality, and being recycled to it can with good effects of energy saving and emission reduction and acquisition
The economic benefit of sight.
Blast furnace cinder facture has two kinds of water quenching and dry granulation method at present.Water quenching is to be water-cooled blast furnace slag, is obtained
The amorphous state slag product arrived can be as the substitute of high energy consumption clinker, thus to obtain higher added value.But it is high
Stove slag water quenching method often with the discharge of sulfurous gas and generation environment pollutes, great lot of water resources is consumed, more than slag high-quality
The shortcomings of heat cannot be utilized rationally.Dry granulation method is broadly divided into drum process, wind quenching method and centrifugal process：The granulation of drum process
Scarce capacity causes the particle size distribution range of blast furnace slag big, small with the contact area of medium in a fluidized bed, and heat exchange efficiency is not
It is high；Wind quenching method generally use air is cooling medium, but since the specific heat ratio water of air is much smaller, so dry granulation process
Middle kinetic energy consumption is larger, and cooling velocity is slow compared with water quenching, while granulated bf slag touches before consolidation with wall in order to prevent
It hits, needs the size for increasing equipment, lead to the bulky of equipment, increase construction cost；Centrifugal granulation method variable-ratio
Revolving cup is granulated slag liquid, and the slag particle diameter of the process is small, and cooling medium is single, but air consumption is big, and power consumption is big.
Invention content
The present invention is directed at least solve one of the technical problems existing in the prior art.For this purpose, present invention offer is a kind of high
Slag granulation and waste-heat recovery device and method, it is therefore an objective to realize that liquid blast furnace is quickly cooled down after granulation, utilize its waste heat
Produce clean energy resource.
To achieve the goals above, the technical solution that the present invention takes is：
A kind of blast furnace slag granulation and waste-heat recovery device, including blast furnace slag granulation mechanism, described device further include for pair
The humidifier of grain slag that blast furnace slag granulation mechanism is thrown away atomization water cooling and for the grain slag after water cooling and importing will to be atomized
Methane fluidisation and the waste heat recovering mechanism that makes the methane after heat exchange be reacted with the vapor after atomization and vaporization.
The blast furnace slag granulation mechanism includes motor, revolving cup and leads slag pipe for what blast furnace slag was imported revolving cup, described turn
Cup is set in the shell of device, and the motor drives revolving cup rotation.
Deflection cone is equipped in the revolving cup, the profile angle of deflection cone is 30 °~60 °.
The humidifier includes water pump, water pipe and set on the atomizer led above slag pipe, and the water pump passes through water pipe
It is connect with atomizer.
The shell is equipped with water-cooling wall, and the grain slag that the revolving cup is thrown away is oriented to machine waste heat recovery after hitting water-cooling wall
Structure.
The water-cooling wall is two layers, and inner wall layer is heat-conducting layer, and outer wall layer is thermal insulation layer, and the water pipe of water-cooling wall is set to heat-conducting layer
It is interior.Outer insulative layer makes for heat-barrier material, and internal heat-conducting layer is that the material of good heat conductivity makes.
Cooling water-cooling wall is equipped on the outside of the motor.Using heat-barrier material.
The atomizer is multiple, the flight path for the atomized water covering grain slag that multiple atomizers spray.It is described
Atomizer be located at and lead right over slag pipe, the number of atomizer is 4~8.
The waste heat recovering mechanism includes the fluid bed being set in shell and around motor, and the bottom of the shell is set
There are methane gas entrance and slag notch, the top of shell to be equipped with gas vent, the grain slag after the atomization water cooling enters fluidisation
For bed with methane fluidisation and heat exchange, the methane after heat exchange reacts the gas warp generated with the vapor after the atomization vaporization of shell
Gas vent is discharged.
The methane gas entrance is distributed in around housing bottom, is preferably provided with eight to ten six methane gas entrances, and
The intake method of methane gas entrance is tangential admission.
The fluid bed is annular fluidized bed, and fluid bed is equipped with gas distribution grid, and slag notch is located under gas distribution grid
Portion.
The gas distribution grid is conical gas distribution grid, and porosity is 10%~20%, and aperture is 1~1.5mm；Gas
The angle of distribution grid is 45 °~90 °.
A kind of blast furnace slag granulation and exhaust heat recovering method, include the following steps：
It is granulated Step 1: blast furnace slag is imported in revolving cup；
Step 2: grain slag is impinged upon after being atomized water cooling on cooling wall, import in fluid bed later；
Step 3: be passed through methane gas, the grain slag fallen into fluid bed is fluidized, at the same with after grain slag heat exchange
Methane and the vaporization water vapor reaction in shell；
Step 4: grain slag is exported through slag notch, the gas of generation is exported through gas vent.
The rotating speed of the revolving cup is 1000~3000r/min.
Beneficial effects of the present invention：
1, the little particle that ball-type is formed during blast furnace slag of the invention is thrown away by revolving cup is sprayed with top atomizer
Atomized water contacts, and atomized water is vaporized to achieve the purpose that fast cooling.The purpose of fast cooling is that granulation can be allowed high
Contain more vitreum in clinker so that all meet follow-up cement manufacture in granulated bf slag either granularity or ingredient
Technological requirement.
2, the blast furnace slag after granulation consolidation of the invention is fallen into the annular fluidized bed around motor, is passed through from bottom
CH4It blows afloat and fluidizes, while the CH after heat exchange is carried out with granulated bf slag4It is clean with the vaporization water vapor reaction production in equipment
Net energy source H2And CO, the required kinetic energy of the process compared with air consumption it is more air-cooled have greatly reduce.
3, water-cooling wall outer wall of the invention is heat-barrier material, and it is the material of good heat conductivity, energy to prevent heat loss, inner wall
It is enough that heat is quickly transmitted into feed pipe；The water pipe of water-cooling wall is arranged in the inner wall of good heat conductivity；Water-cooling wall at motor is
In order to reduce the temperature of motor, using heat-barrier material.
Description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is the structural schematic diagram of the present invention.
In figure label for：
1, slag notch；2, methane gas entrance；3, gas distribution grid；4, water-cooling wall；5, motor；6, grain slag；7, revolving cup；
8, deflection cone；9, atomized water；10, atomizer；11, slag pipe is led；12, gas vent.
Specific implementation mode
Below against attached drawing, by the description of the embodiment, making to the specific implementation mode of the present invention further details of
Explanation, it is therefore an objective to those skilled in the art be helped to have more complete, accurate and deep reason to the design of the present invention, technical solution
Solution, and contribute to its implementation.
As shown in Figure 1, a kind of blast furnace slag granulation and waste-heat recovery device, including blast furnace slag granulation mechanism, humidifier and
Waste heat recovering mechanism, humidifier are used to be atomized water cooling to the grain slag that blast furnace slag granulation mechanism is thrown away；Waste heat recovering mechanism is used
The methane of grain slag and importing after it will be atomized water cooling fluidizes and makes the vapor after methane and atomization and vaporization after heat exchange
Reaction production clear energy sources H2And CO.
Blast furnace slag granulation mechanism includes motor 5, revolving cup 7 and leads slag pipe 11, revolving cup 7 for blast furnace slag to be imported revolving cup 7
In the shell of device, motor drives revolving cup 7 to rotate.The shell of the device is preferably a cylindrical shape, and motor 5 is located at entire
The center of device, top and the revolving cup 7 of motor 5 are fixed.Specifically, the blast furnace slag of liquid from lead slag pipe outflow fall into turn
Cup 7, with the rotational speed of 1000~3000r/min under the drive of motor 5, liquid blast furnace is fallen into after revolving cup outward revolving cup 7
Centrifugal movement is done, the granulation of blast furnace slag is realized.
Humidifier includes water pump, water pipe and set on the atomizer 10 led above slag pipe 11, and water pump passes through water pipe and mist
Change nozzle 10 to connect.Using water pump by hydraulic pressure oral siphon, water is converted into atomized water after atomizer；Atomizer, which is located at, leads
Right over slag pipe, the number of atomizer is preferably four to eight, and the atomized water that atomizer is sprayed can cover
The flight path of granulated bf slag.Preferably, the export center position of the outlet and atomizer 10 of leading slag pipe 11 is located at revolving cup 7
The top of center.
The device of the invention shell is equipped with water-cooling wall 4, and the grain slag that revolving cup 7 is thrown away is oriented to waste heat after hitting water-cooling wall and returns
Receive mechanism.Waste heat recovering mechanism includes the fluid bed being set in shell and around motor, and the bottom of shell is equipped with methane gas
The top of body entrance 2 and slag notch 1, shell is equipped with gas vent 12, is atomized the grain slag after water cooling into fluidized bed and methane
Fluidisation and heat exchange, the methane after heat exchange react the gas generated with the vapor after the atomization vaporization of shell through gas vent
12 discharges.Its reactive mode is by by CH4It is reacted with high-temperature vapor after preheating.Preferably, CH4Gas access is uniformly distributed
Around the housing bottom of device, there are eight to ten six air inlets, and CH4The intake method of gas access is tangential admission.
Fluid bed is preferably annular fluidized bed, and fluid bed uses gas distribution grid 3, slag notch 1 to be located at gas distribution grid 3
Lower part.Gas distribution grid 3 preferably uses conical gas distribution grid, centre to be provided with several stomatas, and porosity is 10%~20%, hole
Diameter is 1~1.5mm；The angle of gas distribution grid is 45 °~90 °.Bottom CH4The CH that gas access is passed through4By gas distribution grid
More blast furnace slag is fluidized and exchanged heat even into fluid bed after 3, absorbs the CH after heat4With the vapor in system
Reaction generates clean energy resource, bottom slag notch 1 discharge system of the cooling granulated bf slag from gas distribution grid 3.
Preferably there is deflection cone 8 at 7 middle part of above-mentioned revolving cup, and the profile angle of deflection cone 8 is 30 °~60 °；Clinker falls on high speed and revolves
Since the effect of centrifugal force and frictional force is dished out outward on the revolving cup turned, annular fluidized bed is fallen into cooling wall collision afterwards.
Above-mentioned water-cooling wall 4 is preferably two layers, and inner wall layer is heat-conducting layer, and outer wall layer is thermal insulation layer, and the water pipe of water-cooling wall is set to
In heat-conducting layer.Outer insulative layer makes for heat-barrier material, and internal heat-conducting layer is that the material of good heat conductivity makes.Specifically,
Water-cooling wall is divided into two layers, and the water-cooling wall of hull outside is heat-barrier material, and it is the material of good heat conductivity to prevent heat loss, inner wall
Material, can quickly transmit feed pipe by heat；The water pipe of water-cooling wall is arranged in the inner wall of good heat conductivity；Water cooling at motor
Wall is in order to reduce the temperature of motor, using heat-barrier material.
The blast furnace slag granulation and exhaust heat recovering method, include the following steps：
It is granulated Step 1: blast furnace slag is imported in revolving cup；Specifically by the blast furnace slag of liquid from lead slag pipe outflow fall into turn
Cup 7, with the rotational speed of 1000~3000r/min under the drive of motor 5, liquid blast furnace is fallen into after revolving cup outward revolving cup 7
Centrifugal movement is done, the granulation of blast furnace slag is realized.
Step 2: grain slag is impinged upon after being atomized water cooling on cooling wall, import in fluid bed later；Being atomized water cooling is
It is realized by above-mentioned humidifier, effect is that atomized water is sprayed into device so that atomized water is in the blast furnace slag with high temperature
Heat absorption is vaporized when contact, reduces the temperature of blast furnace slag, while the vapor generated and fluidizing gas CH4Reaction generates clean energy resource
H2And CO.Fluid bed uses the fluid bed of annular, the blast furnace slag after granulation that can drop into annular fluidized bed, gas distribution grid 3
It is conical distribution plate, centre is provided with several stomatas, and porosity is 10%~20%, and aperture is 1mm~1.5mm.
Step 3: passing through bottom CH4Gas access is passed through methane gas, the grain slag fallen into fluid bed is fluidized, together
When with grain slag heat exchange after methane and shell in vaporization water vapor reaction；The CH being specifically passed through4By gas point
More blast furnace slag is fluidized and exchanged heat even into fluid bed after fabric swatch 3, absorbs the CH after heat4With in system
Vapor reaction generates clean energy resource.
It is discharged from the slag notch 1 of 3 bottom of gas distribution grid Step 4: grain slag is passed through, the gas H of generation2With CO from equipment
12 discharge of top gas outlet is collected.
The present invention is exemplarily described above in association with attached drawing.Obviously, present invention specific implementation is not by above-mentioned side
The limitation of formula.As long as using the improvement of the various unsubstantialities of inventive concept and technical scheme of the present invention progress；Or not
It is improved, the above-mentioned design of the present invention and technical solution are directly applied into other occasions, in protection scope of the present invention
Within.
Claims (10)
1. a kind of blast furnace slag granulation and waste-heat recovery device, including blast furnace slag granulation mechanism, it is characterised in that：Described device is also wrapped
Include the humidifier of the atomization water cooling of the grain slag for being thrown away to blast furnace slag granulation mechanism and for the granulation after water cooling will to be atomized
Slag and the waste heat recovering mechanism methane of importing fluidisation and the methane after heat exchange is made to be reacted with the vapor after atomization and vaporization.
2. blast furnace slag granulation and waste-heat recovery device according to claim 1, it is characterised in that：The blast furnace slag granulation mechanism
Including motor, revolving cup and for blast furnace slag importing revolving cup to be led slag pipe, the revolving cup is set in the shell of device, the motor
Drive revolving cup rotation.
3. blast furnace slag granulation and waste-heat recovery device according to claim 2, it is characterised in that：Water conservancy diversion is equipped in the revolving cup
The profile angle of cone, deflection cone is 30 °~60 °.
4. blast furnace slag granulation and waste-heat recovery device according to claim 2, it is characterised in that：The humidifier includes water
Pump, water pipe and set on the atomizer led above slag pipe, the water pump is connect by water pipe with atomizer.
5. blast furnace slag granulation and waste-heat recovery device according to claim 4, it is characterised in that：The shell is equipped with water cooling
Wall, the grain slag that the revolving cup is thrown away are oriented to waste heat recovering mechanism after hitting water-cooling wall.
6. blast furnace slag granulation and waste-heat recovery device according to claim 4, it is characterised in that：The atomizer is more
It is a, the flight path for the atomized water covering grain slag that multiple atomizers spray.
7. blast furnace slag granulation and waste-heat recovery device according to claim 2, it is characterised in that：The waste heat recovering mechanism packet
The fluid bed in shell and around motor is included, the bottom of the shell is equipped with methane gas entrance and slag notch, shell
The top of body is equipped with gas vent, and the grain slag after the atomization water cooling is handed over into fluidized bed and methane fluidisation and heat exchange, heat
Methane after changing reacts the gas generated with the vapor after the atomization vaporization of shell and is discharged through gas vent.
8. blast furnace slag granulation and waste-heat recovery device according to claim 7, it is characterised in that：The fluid bed is annular flow
Change bed, fluid bed is equipped with gas distribution grid, and slag notch is located at the lower part of gas distribution grid.
9. blast furnace slag granulation and waste-heat recovery device according to claim 8, it is characterised in that：The gas distribution grid is cone
Shape gas distribution grid, porosity are 10%~20%, and aperture is 1~1.5mm；The angle of gas distribution grid is 45 °~90 °.
10. a kind of blast furnace slag granulation and exhaust heat recovering method, which is characterized in that include the following steps：
It is granulated Step 1: blast furnace slag is imported in revolving cup；
Step 2: grain slag is impinged upon after being atomized water cooling on cooling wall, import in fluid bed later；
Step 3: be passed through methane gas, the grain slag fallen into fluid bed is fluidized, at the same with the methane after grain slag heat exchange
With the vaporization water vapor reaction in shell；
Step 4: grain slag is exported through slag notch, the gas of generation is exported through gas vent.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810237987.7A CN108611452A (en) | 2018-03-22 | 2018-03-22 | A kind of blast furnace slag granulation and waste-heat recovery device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810237987.7A CN108611452A (en) | 2018-03-22 | 2018-03-22 | A kind of blast furnace slag granulation and waste-heat recovery device and method |
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| CN108611452A true CN108611452A (en) | 2018-10-02 |
Family
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| CN201810237987.7A Pending CN108611452A (en) | 2018-03-22 | 2018-03-22 | A kind of blast furnace slag granulation and waste-heat recovery device and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877697A (en) * | 2021-10-12 | 2022-01-04 | 东北大学 | Melt impact crushing and granulating system and method |
| CN114231675A (en) * | 2021-12-27 | 2022-03-25 | 上海宝钢节能环保技术有限公司 | Blast furnace slag dry-method granulating device |
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| US4009024A (en) * | 1975-09-26 | 1977-02-22 | Koppers Company, Inc. | Process for regeneration and reuse of steelmaking slag |
| CN101824499A (en) * | 2010-03-19 | 2010-09-08 | 昆明阳光基业股份有限公司 | Liquid blast furnace slag granulation device and granulation method thereof |
| CN101898087A (en) * | 2010-07-09 | 2010-12-01 | 北京大学 | Method and device for converting and absorbing carbon dioxide and comprehensively utilizing waste heat of steel slag |
| CN102766706A (en) * | 2012-07-17 | 2012-11-07 | 北京科技大学 | Coal gasification system for waste heat of blast furnace slag |
| CN103014202A (en) * | 2012-12-21 | 2013-04-03 | 东北大学 | Device and method for recovering high-temperature sensible heat of liquid blast furnace slag |
| CN103787277A (en) * | 2014-01-15 | 2014-05-14 | 中钢集团鞍山热能研究院有限公司 | Method and device for producing synthesis gas through methane reforming with blast furnace slag sensible heat |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4009024A (en) * | 1975-09-26 | 1977-02-22 | Koppers Company, Inc. | Process for regeneration and reuse of steelmaking slag |
| CN101824499A (en) * | 2010-03-19 | 2010-09-08 | 昆明阳光基业股份有限公司 | Liquid blast furnace slag granulation device and granulation method thereof |
| CN101898087A (en) * | 2010-07-09 | 2010-12-01 | 北京大学 | Method and device for converting and absorbing carbon dioxide and comprehensively utilizing waste heat of steel slag |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113877697A (en) * | 2021-10-12 | 2022-01-04 | 东北大学 | Melt impact crushing and granulating system and method |
| CN114231675A (en) * | 2021-12-27 | 2022-03-25 | 上海宝钢节能环保技术有限公司 | Blast furnace slag dry-method granulating device |
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