CN112850763B - Energy-saving synergistic roasting method for aluminum oxide - Google Patents
Energy-saving synergistic roasting method for aluminum oxide Download PDFInfo
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- CN112850763B CN112850763B CN202110100481.3A CN202110100481A CN112850763B CN 112850763 B CN112850763 B CN 112850763B CN 202110100481 A CN202110100481 A CN 202110100481A CN 112850763 B CN112850763 B CN 112850763B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
- C01F7/445—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination making use of a fluidised bed
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
- C01F7/444—Apparatus therefor
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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Abstract
The invention aims to provide an energy-saving synergistic roasting method for aluminum oxide, which comprises the following steps: the aluminum hydroxide raw material is sent into a Venturi tube in a flue gas mode, after being dried, the aluminum hydroxide raw material is sent into a preheating cyclone cylinder I to be in contact with hot gas in the preheating cyclone cylinder I for primary preheating, the gas after heat exchange and ash content in the gas are sent into the preheating cyclone cylinder I together, the gas and the ash content in the gas are subjected to heat exchange with a cooling cyclone cylinder II through an ash return pipe, the gas sent into the cooling cyclone cylinder I is sent into a main furnace after the heat exchange in the cooling cyclone cylinder I is finished, and the gas is used as an oxygen source for roasting of the main furnace. The invention can effectively reduce the temperature control of the main furnace of the roasting furnace under the condition of not influencing the production performance of the existing roasting furnace, and can avoid the influence on the high yield of the roasting furnace and the safe and stable operation of equipment caused by the frequent overhigh discharging temperature of the fluidized bed.
Description
Technical Field
The invention relates to the field of alumina production, in particular to an energy-saving synergistic roasting method for alumina.
Background
An aluminum oxide production enterprise adopting a gas suspension roasting furnace preheats aluminum hydroxide containing certain moisture through two-stage high-temperature flue gas of P01 and P02, then roasting the aluminum hydroxide in a main furnace P04, entering P03 to complete final crystal form conversion, and cooling the aluminum hydroxide through a four-stage cooling cyclone to obtain a finished product of aluminum oxide. After the fine particles separated from the P01 are collected by electric dust collection, the fine particles are conveyed by a material seal pump through an ash return pipeline and returned to the secondary cooling cyclone cylinder to be merged into finished product alumina.
In the actual production process, the ignition loss of the part of the material collected by the electric dust collection is about 2.5%, the retention time of the part of the material entering a roasting furnace system is short, the temperature of the main furnaces of five roasting furnaces is averagely controlled to be more than 1050 ℃ after the temperature of the main furnaces is controlled to be increased in order to not influence the ignition loss of the product alumina, and higher energy consumption is caused.
Disclosure of Invention
The invention aims to provide an energy-saving and efficiency-increasing roasting method for aluminum oxide, which can effectively reduce the temperature control of a main furnace of a roasting furnace under the condition of not influencing the production performance of the conventional roasting furnace, and can avoid the influence on the high yield of the roasting furnace and the safe and stable operation of equipment due to the frequent overhigh discharge temperature of a fluidized bed.
The technical scheme of the invention is as follows:
the energy-saving synergistic roasting method for the aluminum oxide comprises the following steps:
the method comprises the steps of feeding aluminum hydroxide raw materials into a Venturi tube in a flue gas mode, drying the aluminum hydroxide raw materials, feeding the aluminum hydroxide raw materials into a preheating cyclone cylinder I to be in contact with hot gas in the preheating cyclone cylinder I to be preheated for the first time, feeding the gas subjected to heat exchange and ash content in the gas into an electric dust collector, feeding the ash content collected by the electric dust collector into a cooling cyclone cylinder II through an ash return pipe to be mixed with gas discharged from the cooling cyclone cylinder II, mixing the gas with high-temperature alumina materials separated from a separation cyclone cylinder, feeding the mixture into the cooling cyclone cylinder I to be subjected to heat exchange, roasting the ash content under the action of the high-temperature alumina materials, further cooling the alumina materials and most of the ash content in the cooling cyclone cylinder II, feeding the gas and the rest ash content in the gas into a main furnace, using the gas as an oxygen source for roasting of the main furnace, and continuously roasting the ash content in the main furnace.
The energy-saving synergistic roasting method for the aluminum oxide further comprises the following steps:
the first preheated aluminum hydroxide raw material in the preheating cyclone I enters the preheating cyclone II to be contacted with hot gas in the preheating cyclone II for second preheating, the gas after heat exchange is sent into a Venturi dryer to dry the next batch of aluminum hydroxide raw material, and the second preheated aluminum hydroxide raw material is sent into a main furnace for roasting;
the energy-saving synergistic roasting method for the aluminum oxide further comprises the following steps:
the waste gas after roasting of the main furnace and the generated alumina are sent into a separating cyclone, after separation of the separating cyclone, the waste gas is sent into a preheating cyclone II to be used as hot gas for heat exchange, the alumina is sent into a cooling cyclone I to be in contact with the gas in the preheating cyclone II for primary cooling, and the alumina after primary cooling is sent into the cooling cyclone II to be in contact with the gas in the cooling cyclone II for secondary cooling.
The energy-saving synergistic roasting method for the aluminum oxide further comprises the following steps:
and after being mixed with the gas sent by the ash return pipe and the ash in the cooling cyclone II, the gas subjected to heat exchange in the cooling cyclone II is sent into the cooling cyclone I as the gas for heat exchange, and the alumina subjected to secondary cooling is sent into the cooling cyclone III to be in contact with the gas in the cooling cyclone III for third cooling.
The alumina separated by the separation cyclone firstly enters the gas sent out from the cooling cyclone II to the cooling cyclone I and then enters the cooling cyclone I along with the gas for heat exchange.
The energy-saving synergistic roasting method for the aluminum oxide further comprises the following steps:
and (3) conveying the gas subjected to heat exchange in the cooling cyclone III into the cooling cyclone II as the gas for heat exchange, conveying the alumina subjected to third cooling into the cooling cyclone IV, contacting with the gas in the cooling cyclone IV to carry out fourth cooling, and conveying the alumina subjected to fourth cooling into a fluidized bed cooler to be cooled to obtain an alumina product.
The alumina after the first cooling enters the gas sent out from the cooling cyclone III to the cooling cyclone II first, and enters the cooling cyclone II along with the gas for heat exchange;
the alumina after the second cooling enters the gas sent out from the cooling cyclone IV to the cooling cyclone III firstly, and enters the cooling cyclone III along with the gas for heat exchange;
and the alumina cooled for the third time firstly enters the air supply pipe of the cooling cyclone IV and enters the cooling cyclone IV along with the air in the air supply pipe for heat exchange.
And the gas in the gas supply pipe of the cooling cyclone IV is air.
The complete process of the method of the invention is as follows:
A. the aluminum hydroxide raw material is sent into a Venturi tube in a flue gas mode, after being dried, the aluminum hydroxide raw material is sent into a preheating cyclone cylinder I to be contacted with hot gas in the preheating cyclone cylinder I for primary preheating, the gas after heat exchange and ash content in the gas are sent into an ash returning pipe, and the aluminum hydroxide raw material after primary preheating enters a preheating cyclone cylinder II to be contacted with the hot gas in the preheating cyclone cylinder II for secondary preheating;
B. the gas after heat exchange in the preheating cyclone II is sent into a Venturi dryer to dry the next batch of aluminum hydroxide raw materials, and the secondarily preheated aluminum hydroxide raw materials are sent into the main furnace to be roasted;
C. the waste gas after roasting of the main furnace and the generated alumina are sent into a separation cyclone cylinder, after separation of the separation cyclone cylinder, the waste gas is sent into a preheating cyclone cylinder II to be used as hot gas for heat exchange, the alumina is sent into a cooling cyclone cylinder I to be contacted with the gas therein for primary cooling, the gas after heat exchange is sent into the main furnace to be used as an oxygen source, and the alumina after primary cooling is sent into the cooling cyclone cylinder II to be contacted with the gas therein for secondary cooling;
D. the gas after heat exchange in the cooling cyclone II is mixed with the gas sent out by the ash return pipe and the ash in the gas, and then the gas is sent into the cooling cyclone I to be used as the gas for heat exchange, and the alumina after the second cooling is sent into the cooling cyclone III to be contacted with the gas in the cooling cyclone III for the third cooling;
E. the gas after heat exchange in the cooling cyclone III is sent into a cooling cyclone II to be used as gas for heat exchange, and the alumina after the third cooling is sent into a cooling cyclone IV to be contacted with the gas in the cooling cyclone IV to carry out the fourth cooling;
F. and (4) taking the heat exchange gas in the cooling cyclone cylinder IV as external air, and sending the alumina cooled for the fourth time into a fluidized bed cooler for cooling to obtain an alumina product.
The method can effectively reduce the temperature control of the main furnace of the roasting furnace under the condition of not influencing the production performance of the existing roasting furnace, and can avoid the frequent fault of overhigh discharging temperature of the fluidized bed, thereby influencing the high yield of the roasting furnace and the safe and stable operation of equipment.
The method of the invention mixes the kiln dust with the high-temperature alumina material separated by the separation cyclone cylinder by changing the position of the kiln dust entering the system, realizes the roasting of the kiln dust under the action of the high-temperature alumina material, improves the roasting temperature of the kiln dust to be near 400 ℃ on the contrary under the condition of reducing the temperature of the main furnace, prolongs the retention time, realizes the reduction of the fluctuation of the ignition of the alumina and improves the conversion rate of the aluminum hydroxide completely converted into the alumina.
Drawings
FIG. 1 is a schematic structural diagram of an alumina calcination apparatus corresponding to the method of the present invention;
the names and serial numbers of the parts in the figure are as follows:
0-Venturi, 1-preheating cyclone I, 2-preheating cyclone II, 3-separating cyclone, 4-main furnace, 5-cooling cyclone I, 6-cooling cyclone II, 7-cooling cyclone III, 8-cooling cyclone IV, 9-fluidized bed cooler and 10-electric dust collector.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
Example 1
The energy-saving and efficiency-increasing method for the alumina roasting comprises the following steps of:
A. the aluminum hydroxide raw material is sent into a Venturi 0 in a flue gas mode, after being dried, the aluminum hydroxide raw material is sent into a preheating cyclone cylinder I1 to be contacted with hot gas in the preheating cyclone cylinder I1 for primary preheating, the gas after heat exchange and ash content in the gas are sent into an ash returning pipe, and the aluminum hydroxide raw material after primary preheating enters a preheating cyclone cylinder II 2 to be contacted with the hot gas in the preheating cyclone cylinder II 2 for secondary preheating;
B. the gas after heat exchange in the preheating cyclone II 2 is sent into a Venturi dryer to dry the next batch of aluminum hydroxide raw materials, and the aluminum hydroxide raw materials after secondary preheating are sent into a main furnace to be roasted;
C. the method comprises the following steps that waste gas roasted by a main furnace and generated alumina are sent into a separation cyclone cylinder 3, after being separated by the separation cyclone cylinder 3, the waste gas is sent into a preheating cyclone cylinder II 2 to be used as hot gas for heat exchange, the alumina firstly enters gas sent out from a cooling cyclone cylinder II 6 to a cooling cyclone cylinder I5 and then enters the cooling cyclone cylinder I5 along with the gas to carry out heat exchange, so that primary cooling is carried out, the gas after the heat exchange is sent into the main furnace to be used as an oxygen source, the alumina after the primary cooling firstly enters gas sent out from a cooling cyclone cylinder III to the cooling cyclone cylinder II 6 and then enters the cooling cyclone cylinder II 6 along with the gas to carry out heat exchange, so that secondary cooling is carried out;
D. the gas after heat exchange in the cooling cyclone II 6, the gas sent out by the ash return pipe and the ash in the gas are mixed and then sent into the cooling cyclone I5 to be used as the gas for heat exchange, the alumina after the second cooling firstly enters the gas sent out from the cooling cyclone IV 8 to the cooling cyclone III 7 and then enters the cooling cyclone III along with the gas to carry out heat exchange, and therefore the third cooling is carried out;
E. the air after heat exchange in the cooling cyclone III 7 is sent into the cooling cyclone II 6 to be used as the air for heat exchange, the alumina after the third cooling firstly enters the air supply pipe of the cooling cyclone IV 8 and enters the cooling cyclone IV 8 together with the air in the air supply pipe to carry out heat exchange, and therefore the fourth cooling is carried out;
F. and (4) taking the heat exchange gas in the cooling cyclone IV 8 as outside air, and sending the alumina after the fourth cooling into a fluidized bed 9 cooler for cooling to obtain an alumina product.
Example 2
Experiment of mass production
1. Control group
The original production mode is that the temperature of a main furnace of the roasting furnace is controlled, the blanking amount of the roasting furnace is 101m & lt 3 & gt/h, and the yield is 63.6t.AO/h. The temperature of a main furnace of the roasting furnace is controlled at 1065 ℃, and the burning loss of the aluminum oxide is 0.81 percent.
2. After the method of the invention is adopted:
(1) Example 1
The temperature of a main furnace of the roasting furnace is controlled, the blanking amount of the roasting furnace is 101m & lt 3 & gt/h, and the yield is 63.6t.AO/h. The temperature of the main furnace of the roasting furnace is controlled to be 1035 ℃, and the burning loss of the alumina is 0.78 percent.
(2) Example 2
The temperature of a main furnace of the roasting furnace is controlled, the blanking amount of the roasting furnace is 98m3/h, and the yield is 61.7t.AO/h. The temperature of the main furnace of the roasting furnace is controlled to 1025 ℃, and the ignition of alumina is reduced by 0.77 percent.
(3) Example 3
The temperature of a main furnace of the roasting furnace is controlled, the blanking amount of the roasting furnace is 100m & lt 3 & gt/h, and the yield is 63t. The temperature of the main furnace of the roasting furnace is controlled to be 1030 ℃, and the burning of the alumina is reduced by 0.78 percent.
Claims (8)
1. An energy-saving synergistic roasting method for aluminum oxide is characterized by comprising the following steps:
the aluminum hydroxide raw material is sent into a Venturi tube in a flue gas mode, after being dried, the aluminum hydroxide raw material is sent into a preheating cyclone cylinder I to be in contact with hot gas in the preheating cyclone cylinder I for primary preheating, the gas after heat exchange and ash in the gas are sent into an electric dust collector, the ash collected by the electric dust collector is sent into a cooling cyclone cylinder II through an ash return pipe to be mixed with gas discharged from the cooling cyclone cylinder II, then the gas is mixed with high-temperature alumina material separated from a separation cyclone cylinder and sent into a cooling cyclone cylinder I for heat exchange, the ash is roasted under the action of the high-temperature alumina material, then the alumina material and most of the ash fall into the cooling cyclone cylinder II for further cooling, the gas and the rest part of the ash in the gas enter a main furnace, the gas serves as an oxygen source for roasting of the main furnace, and the part of the ash continues to be roasted in the main furnace.
2. The alumina energy-saving synergistic roasting method as claimed in claim 1, characterized by further comprising the following steps:
the aluminum hydroxide raw material preheated for the first time in the preheating cyclone cylinder I enters the preheating cyclone cylinder II to be contacted with hot gas in the preheating cyclone cylinder II for the second preheating, the gas after heat exchange is sent into the Venturi dryer to dry the next batch of aluminum hydroxide raw material, and the aluminum hydroxide raw material preheated for the second time is sent into the main furnace to be roasted.
3. The alumina energy-saving synergistic roasting method as claimed in claim 2, characterized by further comprising the steps of:
the waste gas after roasting of the main furnace and the generated alumina are sent into a separating cyclone, after separation of the separating cyclone, the waste gas is sent into a preheating cyclone II to be used as hot gas for heat exchange, the alumina is sent into a cooling cyclone I to be cooled for the first time, and the alumina after the first cooling is sent into the cooling cyclone II to be contacted with the gas in the cooling cyclone II to be cooled for the second time.
4. The alumina energy-saving synergistic roasting method as claimed in claim 3, characterized by further comprising the steps of:
and after being mixed with the gas sent out by the ash return pipe and the ash content in the gas, the gas subjected to heat exchange in the cooling cyclone II is sent into the cooling cyclone I to be used as the gas for heat exchange, and the alumina subjected to secondary cooling is sent into the cooling cyclone III to be contacted with the gas in the cooling cyclone III for tertiary cooling.
5. The alumina energy-saving synergistic roasting method as claimed in claim 4, characterized in that: the alumina separated by the separation cyclone is firstly mixed with the gas sent out from the cooling cyclone II to the cooling cyclone I, and then enters the cooling cyclone I for heat exchange.
6. The energy-saving and efficiency-increasing roasting method of aluminum oxide as claimed in claim 4, characterized by further comprising the steps of:
and (3) conveying the gas subjected to heat exchange in the cooling cyclone III into the cooling cyclone II as the gas for heat exchange, conveying the alumina subjected to third cooling into the cooling cyclone IV, contacting with the gas in the cooling cyclone IV to carry out fourth cooling, and conveying the alumina subjected to fourth cooling into a fluidized bed cooler to be cooled to obtain an alumina product.
7. The alumina energy-saving synergistic roasting method as claimed in claim 6, characterized in that:
the alumina after the first cooling enters the gas sent out from the cooling cyclone IV to the cooling cyclone II firstly and enters the cooling cyclone II along with the gas for heat exchange;
the alumina after the second cooling enters the gas sent out from the cooling cyclone IV to the cooling cyclone III firstly, and enters the cooling cyclone III along with the gas for heat exchange;
and the alumina cooled for the third time firstly enters the air supply pipe of the cooling cyclone IV and enters the cooling cyclone IV along with the air in the air supply pipe for heat exchange.
8. The alumina energy-saving synergistic roasting method as claimed in claim 7, characterized in that: and the gas in the gas supply pipe of the cooling cyclone IV is air.
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