CN114807463B - Slag quenching and granulating equipment - Google Patents
Slag quenching and granulating equipment Download PDFInfo
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- CN114807463B CN114807463B CN202210579010.XA CN202210579010A CN114807463B CN 114807463 B CN114807463 B CN 114807463B CN 202210579010 A CN202210579010 A CN 202210579010A CN 114807463 B CN114807463 B CN 114807463B
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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
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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
- C21B3/08—Cooling slag
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/02—Physical or chemical treatment of slags
- C21B2400/022—Methods of cooling or quenching molten slag
- C21B2400/028—Methods of cooling or quenching molten slag with the permanent addition of cooled slag or other solids
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2400/00—Treatment of slags originating from iron or steel processes
- C21B2400/05—Apparatus features
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- 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 molten slag rapid cooling granulation equipment, which belongs to the technical field of metallurgy, wherein granules are frozen through a freezing device and a granulation device and then are sprayed out at a high speed, liquid molten slag flow can be dispersed and mixed with the granules, the contact area of the frozen granules and high-temperature molten slag is increased, the high-temperature molten slag flow wraps the frozen granules to form cold nuclear hot skin, rapid cooling granulation of the molten slag flow is realized, and the granulated molten slag granules are stored in a granulation chamber. The invention adopts the frozen particles as a medium to carry out extremely fast heat exchange with the high-temperature molten slag flow, the high-temperature molten slag flow wraps the frozen particles to realize rapid cooling granulation of the molten slag flow, and the high-temperature molten slag flow can be rapidly cooled to produce molten slag particles with uniform particles and high crystal rate.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to slag quenching and granulating equipment.
Background
At present, the treatment method of the slag at home and abroad mainly adopts a water quenching method to obtain an amorphous slag product which can be used as a cement clinker substitute to obtain higher added value and environmental benefit. The high-temperature waste heat of the water quenching slag is converted into the low-temperature waste heat of the slag flushing water, and a large amount of high-quality waste heat of the blast furnace slag is wasted.
In recent years, there have been intensive studies and experiments on granulation of molten slag by some research teams. The following granulation processes are mainly adopted:
the first is the SKLD process: the liquid slag is quantitatively added into a double-roller granulating device for granulating treatment, the granulator consists of an upper row of double rollers and a lower row of double rollers, the upper row is mainly used for granulating the slag, and the lower row is used for granulating and discharging the granulated slag. The inner cavities of the two rows of rollers are forcibly cooled by water, the temperature of the roller surface is lower than 300 ℃, the rapid crusting of the slag on the roller surface is ensured, and the crusting of the broken granulated slag with the liquid core is carried out by primary air. The problems of the process method include furnace slag crusting, uneven granularity of granulated slag, slag wool generation, high abrasion to the roller and high maintenance difficulty.
The second is a metallurgical slag jet dry granulation technology, which is to crush the molten slag by using water as a medium and utilizing high-speed jet. Pressurizing water and spraying the water from a nozzle to form a columnar high-speed water jet, impacting the narrow side face of a free-falling flat strip-shaped molten slag flow, crushing the molten slag, cooling the crushed molten slag by a water wall in the falling process and recovering part of sensible heat, then falling into the fluidized bed layer or an air-cooled moving grate, cooling by air entering from the outside and completely solidifying, completing granulation and obtaining hot air. The process method has the problems that water is introduced to generate secondary pollution, a large amount of cooling air is needed for cooling granulation, and the energy consumption is increased.
The third is a centrifugal turntable granulation method, the molten slag is atomized into fine slag drops through the action of centrifugal force by a turntable granulator rotating at high speed, and the slag drops are rapidly quenched and solidified into slag particles through cooling air at the bottom. The process method has the problems of high processing difficulty, short service life, difficult maintenance and incapability of continuous production of the turntable.
By combining the problems existing in the granulation processes, the key problem to be solved at present is that the cooling rate of granulation must be accelerated, the cooling time must be shortened, the slag granulation performance is improved, the energy consumption and cost are reduced, and the generation of high value-added granules is required to realize the quenching granulation effect and the industrial economic operation of metallurgical slag.
Disclosure of Invention
The invention aims to provide slag quenching granulation equipment, and aims to solve the technical problems that in the prior art, the granulated slag is uneven in granularity, high in energy consumption and high in equipment maintenance difficulty and cannot be continuously produced.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the invention provides slag rapid cooling granulation equipment which comprises a freezing device, a granulation device and a granulation chamber, wherein particles used as cold cores are frozen by the freezing device to form frozen particles, the frozen particles are sprayed out at high speed by the granulation device to be mixed with high-temperature slag flow entering the granulation chamber and can disperse the slag flow, the high-temperature slag flow is wrapped outside the frozen particles to form cold core hot skin, the rapid cooling granulation of the slag is realized, and the granulated slag particles are stored in the granulation chamber.
Preferably, the freezing device comprises a particle bin and a freezing bin, the granulating device comprises a first mixer, an injection pipe and a spray gun, a discharge port of the particle bin is connected with the freezing bin, and the freezing bin is connected with a freezing unit and used for cooling and freezing particles in the freezing bin; the discharge hole of the freezing bin is connected with a first mixer, the air inlet of the first mixer is connected with a compressed air pipe, the outlet of the first mixer is connected with a spray gun through a spray pipe, and the outlet of the spray gun faces the granulating chamber.
Preferably, a discharge valve is arranged at a discharge hole of the particle bin, and a freezing coil is arranged in the freezing bin.
Preferably, the nozzle of the spray gun is a rotary nozzle with an adjustable angle, and the nozzle is rotationally connected with the gun body of the spray gun; the inlet end of the spray gun is connected with a compressed air pipe.
Preferably, the particle outlet end of the granulating chamber is connected with a pneumatic conveying pipeline through a particle conveyor and is used for conveying granulated slag particles into the pneumatic conveying pipeline; one end of the pneumatic conveying pipeline is connected with the compressed air pipe, the other end of the pneumatic conveying pipeline is connected with the particle bin of the refrigerating device, and the slag particles are conveyed to the refrigerating device by the pneumatic conveying pipeline to be refrigerated and cooled to form frozen particles.
Preferably, the system also comprises a pre-dedusting particle recovery device, wherein the pre-dedusting particle recovery device comprises a smoke exhaust pipeline, a dedusting device, a feeding machine and a second mixer, one end of the smoke exhaust pipeline is connected with the granulation chamber, the other end of the smoke exhaust pipeline is connected with the dedusting device, a dust discharge port of the dedusting device is connected with the feeding machine, an outlet of the feeding machine is connected with the second mixer, an air inlet of the second mixer is communicated with a compressed air pipe, and an outlet end of the second mixer is connected with a pneumatic conveying pipeline; one end of the pneumatic conveying pipeline is connected with the compressed air pipe, the other end of the pneumatic conveying pipeline is connected with the particle bin of the refrigerating device, particles collected by the pre-dedusting particle recovery device are conveyed to the refrigerating device through the pneumatic conveying pipeline to be refrigerated and cooled to form frozen particles, and the frozen particles are recycled after being refrigerated.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the prior art, the invention sprays out the particles at high speed after freezing through the freezing device and the granulating device, can disperse and mix the liquid slag flow, and realizes the rapid cooling and granulation of the slag flow by increasing the contact area of the frozen particles and the high-temperature molten slag and wrapping the frozen particles by the high-temperature molten slag flow to form cold nuclear hot skin, and the granulated slag particles are stored in the granulating chamber. The invention adopts the frozen particles as a medium to carry out extremely fast heat exchange with the high-temperature molten slag flow, the high-temperature molten slag flow wraps the frozen particles to realize rapid cooling granulation of the molten slag flow, and the high-temperature molten slag flow can be rapidly cooled to produce molten slag particles with uniform particles and high crystal rate.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic structural diagram of a slag quenching and granulating apparatus provided by an embodiment of the invention;
FIG. 2 is a schematic view of the structure of the freezing device and the granulating device of FIG. 1;
in the figure: 100-a refrigerating device, 101-a particle bin, 102-a refrigerating bin, 103-a refrigerating unit, 104-a discharge valve, 105-a refrigerating coil, 106-a refrigerating fluid inlet pipe and 107-a refrigerating fluid outlet pipe;
200-granulation device, 201-first mixer, 202-injection pipe, 203-spray gun, 204-nozzle;
300-a pre-dedusting particle recovery device, 301-a smoke exhaust pipeline, 302-a dedusting device, 303-a feeder, 304-a second mixer;
1-a granulation chamber, 2-a compressed air pipe, 3-a pneumatic conveying pipeline and 4-a granule conveyor.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1 and 2, the invention provides a slag quenching granulation device, which comprises a freezing device 100, a granulation device 200 and a granulation chamber 1, wherein particles used as cold nuclei are frozen by the freezing device 100 to form frozen particles, the frozen particles are sprayed out at high speed by the granulation device 200 to be mixed with a high-temperature slag flow entering the granulation chamber 1 and can disperse the slag flow, the high-temperature slag flow is wrapped outside the frozen particles to form a cold nuclei hot skin, so that the slag is rapidly cooled and granulated, and the granulated slag particles are stored in the granulation chamber 1. The particles serving as cold nuclei are cooled and frozen by a freezing device and then are sprayed into a granulating chamber at a high speed by the granulating device, the high-temperature slag flow is dispersed and mixed by the frozen particles, the frozen particles externally wrapping the high-temperature slag form cold nucleus hot skin, and the particles and the high-temperature slag flow are subjected to extremely rapid heat exchange, so that the slag is rapidly cooled and granulated. When the normal temperature granule is selected for use to the granule that is used as cold core, refrigerating plant's freezing unit need not to start, and freezing storehouse can as the granule passageway.
In an embodiment of the present invention, as shown in fig. 2, the freezing device 100 includes a particle bin 101 and a freezing bin 102, the granulating device 200 includes a first mixer 201, an injection pipe 202 and an injection gun 203, a discharge port of the particle bin 101 is connected to the freezing bin 102, and the freezing bin 102 is connected to the freezing unit 103 for cooling and freezing particles inside the freezing bin 102; the discharge port of the freezing chamber 102 is connected with a first mixer 201, the air inlet of the first mixer 201 is connected with a compressed air pipe 2, the outlet of the first mixer 201 is connected with a spray gun 203 through a spray pipe 202, and the outlet of a spray nozzle 204 of the spray gun 203 faces the granulation chamber 1. A discharge valve 104 is arranged at a discharge port of the particle bin 101, a freezing coil 105 is arranged inside the freezing bin 102, and a freezing liquid inlet pipe and a freezing liquid outlet pipe of the freezing unit are respectively connected with an inlet and an outlet of the freezing coil, so that the freezing compartment can be circularly refrigerated by freezing liquid. Wherein, the discharge valve adopts a gate valve. The particles are cooled and frozen to the required temperature through the freezing bin 102, and then are conveyed into the first mixer 201 through the particle conveyor 4 at the outlet of the freezing bin 102, and are sprayed into the granulating chamber from the nozzle at high speed by using a spray gun. The particle conveyor can be a screw conveyor capable of measuring.
As shown in fig. 2, the nozzle 204 of the spray gun 203 is a rotary nozzle with an adjustable angle, and the nozzle 204 is rotatably connected with the gun body of the spray gun 203; the inlet end of the lance 203 is connected to the compressed air pipe 2. The spray direction of the nozzle is adjusted by rotating the angle of the nozzle, so that the contact area between the frozen particles and the high-temperature slag is increased as much as possible. The power is enhanced again by supplementing compressed air at the inlet end of the spray gun, the speed and the kinetic energy are greatly improved, and the frozen particles sprayed out at high speed enter the granulating chamber.
As a preferable scheme, as shown in fig. 1, the particle outlet end of the granulation chamber 1 is connected with a pneumatic conveying pipeline 3 through a particle conveyor 4, and is used for conveying the granulated slag particles into the pneumatic conveying pipeline 3; one end of the pneumatic conveying pipeline 3 is connected with the compressed air pipe 2, the other end of the pneumatic conveying pipeline 3 is connected with the particle bin 101 of the refrigerating device 100, and the slag particles are conveyed to the refrigerating device 100 through the pneumatic conveying pipeline 3 to be refrigerated and cooled to form frozen particles. Furthermore, a sieving machine is arranged at the outlet of the granulating chamber, so that slag particles with smaller particle size can be conveyed to a pneumatic conveying pipeline through a particle conveyor after being sieved, the slag particles enter a particle bin along with high-pressure air, the slag particles are used as cold nuclei, the recycling of the slag particles is realized, and the input of particle raw materials used as the cold nuclei is reduced.
Further optimizing the technical scheme, as shown in fig. 1, the slag quenching and granulating device further comprises a pre-dedusting particle recovery device 300, wherein the pre-dedusting particle recovery device 300 comprises a smoke exhaust pipeline 301, a dedusting device 302, a feeder 303 and a second mixer 304, one end of the smoke exhaust pipeline 301 is connected with the granulating chamber 1, the other end of the smoke exhaust pipeline 301 is connected with the dedusting device 302, a dust discharge port of the dedusting device 302 is connected with the feeder 303, an outlet of the feeder 303 is connected with the second mixer 304, an air inlet of the second mixer 304 is communicated with the compressed air pipe 2, and an outlet end of the second mixer 304 is connected with the pneumatic conveying pipeline 3; one end of the pneumatic conveying pipeline 3 is connected with the compressed air pipe 2, the other end of the pneumatic conveying pipeline 3 is connected with the particle bin 101 of the refrigerating device 100, particles collected by the pre-dedusting particle recovery device are conveyed to the refrigerating device 100 through the pneumatic conveying pipeline 3 to be refrigerated and cooled to form frozen particles, and the frozen particles are recycled after being refrigerated. The smoke in the granulating chamber is pumped into the dust removal device through the smoke exhaust pipeline for dust removal, partial slag particles mixed in the smoke are discharged from the dust discharge port at the bottom, are conveyed to the second mixer through the feeding machine, can enter the pneumatic conveying pipeline along with high-pressure air, and then enter the particle bin and the freezing bin for freezing. And the recycled partial slag particles are used as cold cores, so that the investment of particle raw materials can be further reduced, and the production cost is reduced.
The following is an application process of a specific embodiment of the present invention:
1) the granulating chamber 1 is filled with cooled slag particles, and a part of the cooled slag particles are screened by a particle conveyor 4 and sent to a pneumatic conveying pipeline 3; the slag dust particles recovered by the dust removal device 302 are conveyed to the second mixer 304, and are conveyed to the particle bin 101 in a mixing manner in the pneumatic conveying pipeline 3 under the pneumatic pushing of the high-pressure air conveyed by the compressed air pipe 2, so that the cyclic recovery and utilization of the slag particles as a medium are realized.
2) Slag particles in the particle bin 101 are discharged to the freezing bin 102 through a gate valve 104, a plurality of layers of freezing coils 105 which are spiral or arranged are arranged in the freezing bin 102, freezing liquid is circulated through a freezing unit 103, the freezing liquid enters the freezing coils 105 of the freezing bin 102 from a freezing liquid inlet pipe 106 and then is discharged to the freezing unit 103 from a freezing liquid outlet pipe 107 for circulating refrigeration, and particles in the particle bin 101 fall into the freezing bin 102 to contact with the freezing coils 105 for cooling heat exchange to cool the particles to form frozen particles or cold nuclear particles. Wherein, the particles are directly contacted with the multi-layer freezing coil 105 for cooling in the falling process of the freezing bin 102, and the particles are cooled to the required temperature of-10 ℃ to 10 ℃;
3) the frozen particles or the cold nuclear particles are used as a medium for slag blowing granulation and are conveyed into the first mixer 201 through the particle conveyor 4 to be mixed with high-pressure compressed air conveyed by the compressed air pipe 2; the high-pressure compressed air conveys the frozen particles or cold nuclear particles to the rotary nozzle 204 with adjustable angle, the high-pressure compressed air is supplemented at the outlet end of the injection pipe 202 to enhance the power again, and the airflow containing the frozen particles or cold nuclear particles injected at high speed is injected into the granulation chamber 1 to granulate the molten slag flow.
Compressed air is introduced into the inlet end of the spray gun to strengthen the kinetic energy of the particles again, so that the speed and the kinetic energy of the sprayed particles are greatly improved, the particles are quickly sprayed into the molten slag flow through the swirl nozzle, and the frozen or cold-nucleated particles are mixed, wrapped and cooled with the high-temperature molten liquid slag to complete the granulation process of the molten slag.
The invention is adopted to granulate the slag, the frozen particles can select additives capable of modifying the slag, and further adjust the physical and chemical indexes of particle size, pH value, wear resistance, aging resistance and the like after the slag granulation, so that the granulated slag can be directly used as building materials conveniently.
The invention adopts a rapid cooling granulation method to realize rapid cooling granulation of the molten slag, the frozen particles sprayed at high speed disperse the liquid molten slag flow, the contact area of the frozen particles and the high-temperature molten slag can be increased, and after the frozen particles and the high-temperature molten slag flow are mixed, the high-temperature molten slag flow wraps the frozen particles to form a cold core hot skin, thereby realizing rapid cooling granulation of the molten slag flow. The granulation equipment used in the granulation process is shown in fig. 1 and 2. Wherein, the frozen particles are granulated slag particles, and the granulated slag particles are cooled, screened and recycled. Or the frozen particles are collected by a pre-dedusting particle recovery device, conveyed by a pneumatic conveying device and a freezing device, and then frozen for recycling. Or the frozen particles are suitable particles which can rapidly react with the molten slag or do not influence the quality of the molten slag particles, and the frozen particles are used as a medium to complete the two-phase flow molten slag granulation process. In addition, the temperature of the frozen particles can be normal temperature particles or low temperature particles, and the specific temperature can be selected according to actual needs.
In conclusion, the invention adopts the technology that the frozen particles are taken as the medium to disperse the high-temperature liquid slag at high speed to realize rapid cooling granulation, can produce uniform granulated particles and slag particles with high crystallization rate, is beneficial to recycling the waste heat of the slag through the rapid cooling granulation of the high-temperature liquid slag, meets the requirement of environmental protection production, can be used as the main raw material for producing cement and the like, and realizes the dual targets of economic benefit and environmental benefit. The invention has wide application range, is not only suitable for granulating liquid metal slag such as steel making, aluminum making, copper making and the like, but also can be applied to granulating nonmetal liquid slag.
In the description above, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and thus the present invention is not limited to the specific embodiments disclosed above.
Claims (4)
1. A slag quenching granulation equipment is characterized in that: the device comprises a freezing device, a granulating device and a granulating chamber, wherein particles used as cold nuclei are frozen by the freezing device to form frozen particles, the frozen particles are sprayed out at a high speed by the granulating device to be mixed with high-temperature slag flow entering the granulating chamber and can disperse the slag flow, the high-temperature slag flow is wrapped outside the frozen particles to form cold nuclei hot skin, the rapid cooling granulation of the slag is realized, and the granulated slag particles are stored in the granulating chamber; the granulating device comprises a first mixer, an injection pipe and a spray gun, a discharge port of the granule bin is connected with the freezing bin, the freezing bin is connected with a freezing unit, and a freezing coil pipe is arranged inside the freezing bin and used for cooling and freezing granules inside the freezing bin; the discharge hole of the freezing bin is connected with a first mixer, the air inlet of the first mixer is connected with a compressed air pipe, the outlet of the first mixer is connected with a spray gun through a spray pipe, and the outlet of a spray nozzle of the spray gun faces the granulating chamber; the nozzle of the spray gun is a rotary nozzle with an adjustable angle, and the nozzle is rotationally connected with the gun body of the spray gun;
the particle outlet end of the granulating chamber is connected with a pneumatic conveying pipeline through a particle conveyor and is used for conveying granulated slag particles into the pneumatic conveying pipeline; one end of the pneumatic conveying pipeline is connected with the compressed air pipe, the other end of the pneumatic conveying pipeline is connected with the particle bin of the refrigerating device, and the slag particles are conveyed to the refrigerating device by the pneumatic conveying pipeline to be refrigerated and cooled to form frozen particles.
2. The slag quenching and granulating apparatus as claimed in claim 1, wherein: and a discharge port of the particle bin is provided with a discharge valve.
3. The slag quenching and granulating apparatus as claimed in claim 1, wherein: the inlet end of the spray gun is connected with a compressed air pipe.
4. The slag quenching and granulating apparatus as claimed in claim 1, wherein: the device comprises a granulating chamber, a dust removal device, a dust discharge port of the dust removal device, a feeder, a pneumatic conveying pipeline, a pre-dedusting particle recovery device and a control system, wherein the pre-dedusting particle recovery device comprises a smoke exhaust pipeline, the dust removal device, the feeder and a second mixer; one end of the pneumatic conveying pipeline is connected with the compressed air pipe, the other end of the pneumatic conveying pipeline is connected with the particle bin of the refrigerating device, particles collected by the pre-dedusting particle recovery device are conveyed to the refrigerating device through the pneumatic conveying pipeline to be refrigerated and cooled to form frozen particles, and the frozen particles are recycled after being refrigerated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210579010.XA CN114807463B (en) | 2022-05-26 | 2022-05-26 | Slag quenching and granulating equipment |
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| CN202210579010.XA CN114807463B (en) | 2022-05-26 | 2022-05-26 | Slag quenching and granulating equipment |
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| CN114807463A CN114807463A (en) | 2022-07-29 |
| CN114807463B true CN114807463B (en) | 2022-09-30 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9119788D0 (en) * | 1991-09-17 | 1991-10-30 | Davy Mckee Stockton | Slag granulation |
| CN101665845B (en) * | 2009-09-28 | 2011-06-15 | 清华大学 | Liquid blast furnace slag granulation method and device thereof |
| CN103014201B (en) * | 2013-01-18 | 2015-05-13 | 北京科技大学 | Device and method for gas-solid ejection and granulation of molten blast furnace slags |
| CN107287370B (en) * | 2017-06-14 | 2019-02-05 | 东北大学 | " double to quench " device and method of dry granulation recycling blast furnace slag waste heat |
| CN109207659B (en) * | 2018-10-06 | 2020-02-14 | 天津大学 | Molten slag granulating device and heat recovery method |
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