CN112304092A - Powder material fluidized bed sintering device - Google Patents
Powder material fluidized bed sintering device Download PDFInfo
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- CN112304092A CN112304092A CN202011095058.0A CN202011095058A CN112304092A CN 112304092 A CN112304092 A CN 112304092A CN 202011095058 A CN202011095058 A CN 202011095058A CN 112304092 A CN112304092 A CN 112304092A
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- sintering
- fluidized bed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/106—Preheating, burning calcining or cooling in fluidised bed furnaces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/08—Arrangements of devices for charging
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B15/00—Fluidised-bed furnaces; Other furnaces using or treating finely-divided materials in dispersion
- F27B15/02—Details, accessories, or equipment peculiar to furnaces of these types
- F27B15/18—Arrangements of controlling devices
-
- 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
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
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- 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
Abstract
A fluidized bed sintering device for powder materials belongs to an ore smelting sintering device, introduces the concept of a fluidized bed into the field of high-temperature reburning of powder materials, is formed by innovatively designing after systematic optimization of key factors of reburning such as materials, gas velocity, heat and the like, can more quickly realize heat transfer of the materials, gas product diffusion and material crystal form transformation, and particularly overcomes the limitation that a traditional sintering device such as a vertical kiln can only use blocky materials. The device makes full use of the characteristics of fast heat exchange rate of the fluidized bed/moving bed, large output, uniform heated particles and the like, greatly reduces the sintering temperature and shortens the sintering time compared with the traditional sintering device, thereby improving the treatment capacity of the system and reducing the production cost of sintered products. The device has outstanding advantages on materials with poor heat-conducting property, crystal transformation and gas separation, such as magnesite reburning.
Description
Technical Field
The invention belongs to an ore smelting and sintering device, and particularly relates to a fluidized bed sintering device for a powder material.
Background
The shaft kiln is the main sintering device in China, belongs to the thermal equipment for continuously calcining clinker, and consists of a kiln body, a feeding and discharging device, ventilation equipment and the like. Widely used for calcining various refractory raw materials, lime and other fields. The shaft kiln works according to the principle of countercurrent heat transfer, materials in the kiln move from top to bottom, smoke passes through the whole material column materials from bottom to top to be preheated, calcined and cooled in the kiln, the requirement on the lumpiness of raw materials entering the kiln is very strict, generally is 25-150mm, the raw materials must be placed in the kiln in a grading mode, the ratio of the maximum lumpiness to the minimum lumpiness is not more than 2-3, otherwise, material blockage is formed, and the smoke is prevented from passing through a material layer. Therefore, the shaft kiln can not process the powder and granular materials, so that a large amount of powder and granular materials in China can not be deeply processed to be used as low-end products without a proper sintering device, and some powder and granular materials even become wastes. For better illustration of the device, the invention is mainly illustrated by taking magnesite as a description object.
Magnesite is a mineral resource composed of magnesium carbonate as a main mineral, the storage capacity of magnesite in China is about 30 hundred million tons, the magnesite is the first in the world and is mainly distributed in Liaoning and Shandong provinces, and Liaoning accounts for more than 90 percent. The products of magnesite after calcination and melting at different temperatures include light-burned magnesia, heavy-burned magnesia and electric-melting magnesia. Among them, dead burned magnesia (also called sintered magnesia) is an important refractory material raw material, widely used in high temperature industries such as ferrous metallurgy, building materials, non-ferrous metal metallurgy, etc., accounting for more than 40% of the whole magnesia refractory material, and the quality of the refractory material plays a key role in the technical development of the high temperature industries such as steel. Wherein the sintered magnesia with MgO mass fraction more than 99 percent (domestic general MgO mass fraction more than 98 percent) and volume density more than 3.30g/cm3 is also called high-purity magnesia.
The high-purity magnesite has a melting point as high as 2825 ℃, has good high temperature resistance, corrosion resistance and heat preservation characteristics, is a refractory material with excellent performance, and is widely applied to various fields and industries such as steel, metallurgy, building materials, national defense, medical appliances, cement, glass and the like. In recent years, with the progress of smelting technology in the steel and metallurgy industries, higher requirements on the yield and quality of high-purity magnesite are also put forward.
The high-purity magnesite can be produced by adopting a two-step calcining process of light burning, fine grinding, high-pressure ball pressing and dead burning of magnesite. At present, the production process of high-purity magnesite in China adopts high-quality magnesite as a raw material, after the magnesite is lightly burned by a reverberatory furnace taking coal gas as fuel, the lightly burned magnesite powder is finely ground into powder, the ball is pressed by a high-pressure ball press in a dry method, and finally the high-purity magnesite is calcined in a high-temperature shaft kiln taking heavy oil as fuel. The high-grade high-purity magnesite can be produced by improving the purity of magnesium oxide through a flotation process, lightly burning the magnesia by a multi-layer furnace and calcining the magnesia in a vertical kiln at high temperature by taking liquefied natural gas as fuel. However, the technology has high requirement on the quality of magnesite raw materials, only blocky high-quality raw materials can be used, a large amount of powdery and low-quality magnesite resources are wasted, the temperature required by the reburning in the shaft kiln is high, the time is long, the energy consumption is high, the yield of dry-method ball pressing equipment is low, and the dust pollution is serious.
Therefore, it is necessary to develop a sintering device which is suitable for powder materials, environment-friendly, low in energy consumption and high in reburning efficiency.
Disclosure of Invention
The invention aims to provide a fluidized bed sintering device for powder materials, which solves the problem that the traditional sintering device has strict requirements on material quality and granularity, reduces the calcining temperature required by sintering, shortens the calcining time, improves the calcining efficiency and further improves the resource utilization rate of the materials.
The purpose of the invention is realized by the following technical scheme:
a fluidized bed sintering device for powder materials comprises a powder material feeding system, a preheating system, a sintering system, a heat recovery system and a tail gas treatment system; the feeding system is connected with the exhaust end at the upper part of the preheating system, and the powder raw material enters the preheating system through the feeding system to perform sufficient heat exchange with hot tail gas discharged by the sintering system so as to preheat the material and recover the heat of the tail gas; the air inlet end of the lower part of the preheating system is provided with a microporous filter plate and is connected with the exhaust end of the sintering system, tail gas discharged by the sintering system enters the preheating system through the filter plate and is fully contacted with the granular raw material and sends heat exchange, the air outlet end of the preheating system is connected with a tail gas treatment system, the bottom of the preheating system is provided with a discharge valve capable of controlling the discharge amount, the discharge valve is connected with the top of the sintering system, and the heat exchange of enough material amount in the preheating system can be accurately controlled by controlling the opening degrees of the discharge valve and a feeding device; the exhaust end of the sintering system is connected with the air inlet end of the preheating system, the bottom of the sintering system is provided with a gas distribution plate, the sintering system is provided with a fuel injection device, heated air enters the sintering system from the gas distribution plate to fluidize materials in the sintering system, and meanwhile, the fuel is combusted under the combustion supporting of the entering air to release heat, so that the sintering system reaches a preset temperature; a solid particle discharger is arranged between the sintering system and the heat recovery system, so that the particles are discharged from the sintering system to the heat recovery system, and gas is prevented from passing through the sintering system; the top of the heat recovery system is provided with a filter plate, the lower part of the heat recovery system is provided with an air inlet distribution plate, the bottom of the heat recovery system is provided with a discharge device of a sintered product, and the discharge amount of the discharge device is adjustable, so that the material amount in the heat recovery system is enough to promote the heat recovery; the tail gas treatment system is a desulfurization, denitration and dust removal system.
A fluidized bed sintering apparatus for a particulate material, such as, but not limited to, a feedstock having a particle size of 0 to 6mm, preferably 0 to 1mm, more preferably 0 to 0.2 mm; the device adopts a screw feeder, a pneumatic conveying device and a feeding valve at the bottom of the bin.
A fluidized bed sintering device for powder materials is characterized in that a preheating system of the device exchanges heat with powder materials by using hot flue gas exhausted by a sintering system, and a heat exchange device is a plate-type or tubular non-contact heat exchanger and can also be a direct contact heat exchange device; such as a fluidized bed, a moving bed, a counter-current transport bed, preferably a moving bed.
A fluidized bed sintering device for powder material, the sintering temperature of the sintering system of the device is higher than 600-900 ℃ of the traditional fluidized bed, such as but not limited to 1200-1800 ℃; the sintering system realizes the rapid transfer of heat in the system through fluidizing gas, and the system is a fluidized bed or a moving bed according to different fluidizing states; the fuel in the bed is fuel gas or coal powder, preferably, the fuel gas, and the oxygen required by the fuel combustion is provided by the air entering from the bottom of the bed; the rapid heat transfer and the crystal form transformation at a specific temperature are realized by adjusting the amounts of the fluidizing gas, the fuel and the sintering raw material; the sintering temperature is lower than the temperature required by the same material in the traditional shaft kiln and other devices, and the sintering time is far lower than that of the traditional reburning device.
A fluidized bed sintering device for powder material is characterized in that a heat recovery system of the device uses air to cool and recover heat of a sintered product in a high-temperature state through a heat exchange device; the heat exchange device is a plate, tubular non-contact heat exchanger, or a direct contact heat exchange device, such as a fluidized bed, a moving bed, a counter-current transport bed, preferably a moving bed.
The bottom of the powder material fluidized bed sintering device, the preheating system and the heat recovery system is sufficiently regulated by a valve capable of controlling flow so as to realize sufficient heat exchange, and the valve can be a star valve, a gate valve or a plug valve.
A powder material fluidized bed sintering device, be equipped with solid particle discharger between sintering system and heat recovery system, the solid particle that keeps the material level throughout in this discharger, fluidizing gas is let in to the discharger bottom, the inside solid powdery granule of discharger is followed sintering system flow to heat recovery system like liquid, but gas is blockked to be unable to pass through by the solid particle in the discharger.
The invention has the beneficial effects that:
firstly, a sintering device capable of using powder materials as a reburning raw material is provided, the restriction that the powder materials cannot be used in the traditional shaft kiln and other devices is solved, and the resource utilization rate of the materials is improved;
and secondly, the calcination temperature is reduced, and the calcination time is shortened, so that the system processing capacity is greatly improved, and the production cost is reduced.
Drawings
FIG. 1 provides a large particle material agglomeration mechanism model;
figure 2 shows an apparatus for producing sintered magnesite from magnesite according to an embodiment of the invention;
fig. 3 shows a system diagram of an apparatus according to the invention.
The numbers in the figures are identified as follows: 1-a controllable feeding device; 2-moving bed preheater; 3-a microporous filter plate; 4-controllable discharge valve; 5-fluidized bed sintering device; 6-a gas distribution plate; 7-gas locking and discharging device; 8-a microporous filter plate; 9-moving bed heat recovery unit.
Detailed Description
FIG. 1 provides a large particle material agglomeration mechanism model, which illustrates both the source of the inventive concept and the root cause of the advantages of the present invention over conventional devices.
The description is given by taking magnesite reburning as an example: the preparation of high-density sintered magnesite by magnesite reburning is based on crystal transformation, but the internal of the bottom particles is not the CO generated by magnesite thermal decomposition2The density can be increased by exhausting gas or gas in crystal gaps, so that the applicant believes that the main reason for the slow reburning (including electric smelting) rate of magnesite is due to the difference between the temperature inside and outside the particles. As is known, magnesite light-burned powder and magnesite heavy-burned powder are both refractory materials and have excellent heat insulation performance, which means that heat is very difficult to transfer to the inside of particles through the outer layer of the particles, resulting in large temperature difference between the inside and the outside of the particles, or the inside of the particles reaches a target temperature after being out of the particles. The outermost layer, which reaches the target temperature first, the crystals are first converted into a dense structure, resulting in a particle layer relatively closer to the center of the particle, which also makes it difficult to vent the gas in the pores through the dense outer layer crystals after reaching the target temperature later. In order to achieve a compact structure inside, the conventional technology is to prolong the time or increase the temperature and increase the opportunity of gas exhaust. However, after the temperature is increased, the surface layer of the particles is melted, so that the surfaces of the particles have no pore channels through which gas passes, when the internal gas quantity is small enough, the gas exhaust is stopped when the internal gas quantity cannot provide enough power for penetrating into the melting layer, and the crystal form transformation is declared to be finished. Generalized magnesite weightsThe main problems of burning are: 1) heat is difficult to transfer in the particles, and the target temperature is reached after the interior of the particles is more external; 2) the inside of the particles reaches a compact crystal form after being outside; 3) the gas in the pore canal in the particle passes through the outer dense crystal layer and the outer melting layer of the particle.
Therefore, the invention adopts the high-temperature fluidized bed/moving bed to reburn magnesite, uses fine magnesite as sintering raw material, keeps the temperature inside and outside the particles consistent or smaller difference to a great extent, and discharges the inner layer pore passage gas and the outer layer gas basically at the same time, and greatly shortens the discharge path of the inner gas, thereby rapidly realizing the aim of converting the crystal form of the magnesium oxide without high temperature.
The preferred apparatus of the present invention will now be described in more detail, with reference to FIG. 2. While the following describes preferred embodiments of the present invention, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
10t/h of magnesite raw material with the granularity of 0-1mm is fed into a 2-moving bed preheater through a 1-screw conveyor, heated to about 300 ℃ by hot flue gas entering from a 3-microporous filter plate, and enters a flue gas purification system for denitration, desulfurization and dust removal after the temperature of the hot flue gas is reduced to about 200 ℃ and then is discharged into the atmosphere;
the preheated magnesite enters a 5 fluidized bed sintering device through a 4 controllable discharge valve, hot air for recovering heat of high-temperature sintered magnesite enters from a 6 gas distribution plate, the fluidization effect is realized on the magnesite, and natural gas for supporting combustion and spraying into the sintering device provides heat for calcining the magnesite. The temperature in the sintering device is controlled to 1400 ℃ by controlling the natural gas and the air quantity, and the natural gas consumption is about 1000m at the moment3H, air consumption of about 10000m3H is used as the reference value. Calcining for 10 minutes to form the ideal sintered magnesia (MgO content)>98% bulk density>3.3g/cm3) The sintering time is far lower than 1800 ℃ required by the traditional shaft kiln for hours;
after sintering, high-temperature sintered magnesite at 1400 ℃ enters a 9-moving-bed heat recovery device through a 7-gas locking discharge device (a J valve in the position) to exchange heat with air in a moving bed, and the temperature is reduced to 200 ℃ to be discharged to form a final product; the air temperature absorbing the heat of the sintered magnesia is increased from 20 ℃ to about 800 ℃, and enters the fluidized bed sintering device through the 8-micropore filter plate and the 6-gas distribution plate to be used as the combustion-supporting gas of the fluidized gas and the natural gas.
Claims (7)
1. A fluidized bed sintering device for powder materials is characterized by comprising a powder raw material feeding system, a preheating system, a sintering system, a heat recovery system and a tail gas treatment system; the feeding system is connected with the exhaust end at the upper part of the preheating system, and the powder raw material enters the preheating system through the feeding system to perform sufficient heat exchange with hot tail gas discharged by the sintering system so as to preheat the material and recover the heat of the tail gas; the air inlet end of the lower part of the preheating system is provided with a microporous filter plate and is connected with the exhaust end of the sintering system, tail gas discharged by the sintering system enters the preheating system through the filter plate and is fully contacted with the granular raw material and sends heat exchange, the air outlet end of the preheating system is connected with a tail gas treatment system, the bottom of the preheating system is provided with a discharge valve capable of controlling the discharge amount, the discharge valve is connected with the top of the sintering system, and the heat exchange of enough material amount in the preheating system can be accurately controlled by controlling the opening degrees of the discharge valve and a feeding device; the exhaust end of the sintering system is connected with the air inlet end of the preheating system, the bottom of the sintering system is provided with a gas distribution plate, the sintering system is provided with a fuel injection device, heated air enters the sintering system from the gas distribution plate to fluidize materials in the sintering system, and meanwhile, the fuel is combusted under the combustion supporting of the entering air to release heat, so that the sintering system reaches a preset temperature; a solid particle discharger is arranged between the sintering system and the heat recovery system, so that the particles are discharged from the sintering system to the heat recovery system, and gas is prevented from passing through the sintering system; the top of the heat recovery system is provided with a filter plate, the lower part of the heat recovery system is provided with an air inlet distribution plate, the bottom of the heat recovery system is provided with a discharge device of a sintered product, and the discharge amount of the discharge device is adjustable, so that the material amount in the heat recovery system is enough to promote the heat recovery; the tail gas treatment system is a desulfurization, denitration and dust removal system.
2. The apparatus for fluidized bed sintering of a particulate material according to claim 1, wherein the feedstock has a particle size such as, but not limited to, 0-6mm, preferably 0-1mm, more preferably 0-0.2 mm; the device adopts a screw feeder, a pneumatic conveying device and a feeding valve at the bottom of the bin.
3. The fluidized bed sintering device for powder materials according to claim 1, wherein the preheating system of the device exchanges heat with the powder materials by using hot flue gas exhausted from the sintering system, and the heat exchange device is a plate-type, tubular non-contact heat exchanger or a direct contact heat exchange device; such as a fluidized bed, a moving bed, a counter-current transport bed, preferably a moving bed.
4. The fluidized bed sintering device for particulate matter as claimed in claim 1, wherein the sintering temperature of the sintering system of the device is higher than 600-900 ℃, such as but not limited to 1200-1800 ℃ of the conventional fluidized bed; the sintering system realizes the rapid transfer of heat in the system through fluidizing gas, and the system is a fluidized bed or a moving bed according to different fluidizing states; the fuel in the bed is fuel gas or coal powder, preferably, the fuel gas, and the oxygen required by the fuel combustion is provided by the air entering from the bottom of the bed; the rapid heat transfer and the crystal form transformation at a specific temperature are realized by adjusting the amounts of the fluidizing gas, the fuel and the sintering raw material; the sintering temperature is lower than the temperature required by the same material in the traditional shaft kiln and other devices, and the sintering time is far lower than that of the traditional reburning device.
5. The fluidized bed sintering device for the powder material according to claim 1, wherein a heat recovery system of the device uses air to cool and recover heat of the sintered product in a high temperature state through a heat exchange device; the heat exchange device is a plate, tubular non-contact heat exchanger, or a direct contact heat exchange device, such as a fluidized bed, a moving bed, a counter-current transport bed, preferably a moving bed.
6. The fluidized bed sintering device for the powder material according to claim 1, wherein the preheating system and the heat recovery system are provided with a sufficient amount of material in the preheating system through a valve capable of controlling flow at the bottom to realize sufficient heat exchange, and the valve can be a star valve, a gate valve or a plug valve.
7. The apparatus of claim 1, wherein a solid particle discharger is installed between the sintering system and the heat recovery system, the discharger is filled with solid particles at a constant level, fluidizing gas is introduced into the bottom of the discharger, and the solid powder particles in the discharger flow from the sintering system to the heat recovery system like liquid, but the gas is blocked by the solid particles in the discharger.
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| US4423558A (en) * | 1978-09-21 | 1984-01-03 | St. Gobain Vitrage | Device for heat exchange between solid particles and a gas current |
| JP2002062056A (en) * | 2000-08-15 | 2002-02-28 | Ngk Insulators Ltd | Method for sintering particle aggregate |
| CN1632436A (en) * | 2005-01-18 | 2005-06-29 | 中国科学院过程工程研究所 | Fast fluidized calcining process |
| CN108863114A (en) * | 2018-07-06 | 2018-11-23 | 沈阳化工大学 | A kind of method that the light-burned process waste heat of magnesite recycles |
| CN109020265A (en) * | 2018-08-15 | 2018-12-18 | 沈阳化工大学 | A kind of air high temperature preheating technique raising light-calcined magnesite product high yield method |
| CN109052997A (en) * | 2018-10-26 | 2018-12-21 | 辽宁科技大学 | Fixed bed-fluidized bed multithread state preparation high activity light calcined magnesia method |
| CN109136539A (en) * | 2018-07-05 | 2019-01-04 | 沈阳化工大学 | A kind of fluidized bed two stage gasification and flash light-calcined magnesite integral process |
-
2020
- 2020-10-14 CN CN202011095058.0A patent/CN112304092B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4423558A (en) * | 1978-09-21 | 1984-01-03 | St. Gobain Vitrage | Device for heat exchange between solid particles and a gas current |
| JP2002062056A (en) * | 2000-08-15 | 2002-02-28 | Ngk Insulators Ltd | Method for sintering particle aggregate |
| CN1632436A (en) * | 2005-01-18 | 2005-06-29 | 中国科学院过程工程研究所 | Fast fluidized calcining process |
| CN109136539A (en) * | 2018-07-05 | 2019-01-04 | 沈阳化工大学 | A kind of fluidized bed two stage gasification and flash light-calcined magnesite integral process |
| CN108863114A (en) * | 2018-07-06 | 2018-11-23 | 沈阳化工大学 | A kind of method that the light-burned process waste heat of magnesite recycles |
| CN109020265A (en) * | 2018-08-15 | 2018-12-18 | 沈阳化工大学 | A kind of air high temperature preheating technique raising light-calcined magnesite product high yield method |
| CN109052997A (en) * | 2018-10-26 | 2018-12-21 | 辽宁科技大学 | Fixed bed-fluidized bed multithread state preparation high activity light calcined magnesia method |
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