CN107265488B - A kind of process unit and method of two step method production γ type aluminium oxide - Google Patents
A kind of process unit and method of two step method production γ type aluminium oxide Download PDFInfo
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- CN107265488B CN107265488B CN201710594626.3A CN201710594626A CN107265488B CN 107265488 B CN107265488 B CN 107265488B CN 201710594626 A CN201710594626 A CN 201710594626A CN 107265488 B CN107265488 B CN 107265488B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
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- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
- C01F7/306—Thermal decomposition of hydrated chlorides, e.g. of aluminium trichloride hexahydrate
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- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
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Abstract
A kind of process unit and method of two step method production γ type aluminium oxide, belong to aluminium oxide calcining field.The device includes drying system device：First combustion furnace, charger, pneumatic convey drier, the first cyclone trap, the first trap, the first feed screw and the first air-introduced machine；It is pyrolyzed roasting system device：Second combustion furnace, dynamic roasting stove, crystal form integrator, the second cyclone trap, multistage pre-heating system, the second trap, the second air-introduced machine, the second feed screw and heat exchanger.Preparing γ type aluminium oxide using the device includes：Using Aluminum Chloride Hexahydrate low temperature drying as the first step, dried material is preheated in multistage pre-heating system, dynamic roasting stove high-temperature roasting pyrolysis is that γ types aluminium oxide, crystal form integrate processing and be used as second step.It is preheated using multistage, realizes that baking tail gases heat echelon utilizes, improve system thermal efficiency.The device production performance is good, recycled convenient for tail gas HCl, operating environment is good, rational technology, industrialization degree are high.
Description
Technical field
The invention belongs to aluminium oxide calcining technical fields, and in particular to a kind of technique dress of two step method production γ type aluminium oxide
It sets and process.
Background technology
The pyrolysis roasting of Aluminum Chloride Hexahydrate (crystal aluminum chloride) is the key that flyash with acidity extraction alumina technology work
One of sequence.Due to crystal aluminum chloride and aluminium hydroxide in physics, chemical property there are larger difference, it is existing ripe by hydroxide
The technological equipment of aluminium baked for producing aluminium oxide cannot be used directly, so with the technique of Aluminum Chloride Hexahydrate baked for producing aluminium oxide
Device and process need separately developmental research.Currently, developed Aluminum Chloride Hexahydrate roasting technique, using with drying,
Calcining process is composed in series a process system jointly, is referred to as one-step technology.In the process system, calcining process tail
Gas will be introduced in drying machine, remove free moisture for the Aluminum Chloride Hexahydrate in input drying machine and partially crystallizable water provides heat.
Due to containing hygroscopic water and HCl gases as the baking tail gases of dry gas, Aluminum Chloride Hexahydrate easily goes out under low temperature drying state
Existing conglomeration, ruckbildung, cause equipment continuous operation performance poor.Since the tail gas of dry tail gas namely system discharge contains
A large amount of aqueous vapors, also contain HCl so that the humidity of system tail gas is big, and HCl concentration is low and large-minded, causes at the HCl absorptions of tail gas
It is big to manage difficulty.Dry gas contains HCl gases and is contacted with wet feed simultaneously, strong to equipment corrosion, and device needs are taken corresponding
Anti-corrosion measure.
For above-mentioned engineering problem, the present invention is a kind of to be pyrolyzed the drying of Aluminum Chloride Hexahydrate pneumatic drier and dynamic roasting stove
Roasting is divided into two independent operation units, referred to as two-step process.Two-step process can fundamentally avoid one-step method work
Above-mentioned engineering problem caused by skill.
Invention content
The object of the present invention is to provide process unit and method that a kind of two step method produces γ type aluminium oxide, this method is
Aluminum Chloride Hexahydrate is dry, pyrolysis roasting is divided into two independent operating units, and production γ type aluminium oxide is carried out with two step method
Process unit and method.This method is done Aluminum Chloride Hexahydrate using dry, pyrolysis roasting two-step process by low temperature first
Dry removal free moisture and most of crystallization water, are then preheated material after drying by multistage pre-heating system, are finally sent into dynamic
The high-temperature roasting of state roaster, pyrolysis are final products γ type aluminium oxide, and final products γ types aluminium oxide is handled through crystal form integration again
After put in storage.The drying tail gas that drying process generates directly empties, and roasting pyrogenic processes tail gas is by preheating, heat exchange, dust catching
It is sent into the processing of HCl absorption systems afterwards.The device and method avoid many production problems caused by one-step technology.It uses
Process unit security performance and operating environment are good.Using multistage preheating method, realizes that baking tail gases heat echelon utilizes, improve
System thermal efficiency.Using with dispersing device pneumatic convey drier and independent combustion furnace heat supply low temperature drying, material is effectively avoided
Conglomeration ruckbildung；Using dynamic roasting stove, by independent combustion furnace heat supply and crystal form integrator is used, α types is effectively avoided to aoxidize
Aluminium generates and the integration of product γ type aluminium oxide crystal forms tends to be uniform.Its device and method industrialization degree of two-step process is high.
A kind of process unit of two step method production γ type aluminium oxide of the present invention, including drying system device and pyrolysis roast
System and device；
Wherein, the equipment that the drying system device includes is：First combustion furnace, charger, pneumatic convey drier,
One cyclone trap, the first trap, the first feed screw and the first air-introduced machine；
The equipment that the pyrolysis roasting system device includes is：Second combustion furnace, dynamic roasting stove, crystal form integrator,
Second cyclone trap, multistage pre-heating system, the second trap, the second air-introduced machine, the second feed screw and heat exchanger；
Wherein, the multistage pre-heating system is that multiple preheaters are connected together in series, wherein preheating material first
First preheater be level-one preheater, second preheater is two level preheater, third preheater is three-level preheater,
And so on.
Wherein, the pneumatic convey drier of drying system device is provided with air outlet, feed inlet, air inlet, drying system dress
The first cyclone trap set is provided with air inlet and outlet and discharge port, the first trap be provided with air inlet and outlet and
Discharge port, wherein pneumatic convey drier feed inlet is connected with charger, the air inlet of pneumatic convey drier and the first combustion furnace
Be connected, the air inlet of the air outlet of pneumatic convey drier and the first cyclone trap is connected, the first cyclone trap is successively
Connect with the first trap, the first air-introduced machine, meanwhile, the discharge port of the first cyclone trap and the first trap discharge port with
First feed screw is connected, the air inlet pipe of the first feed screw discharge port and the level-one preheater in multistage pre-heating system
Road is connected；Connection type between each equipment is to be connected by pipeline；
The dynamic roasting stove of pyrolysis roasting system device is provided with feed inlet, air inlet and air outlet, is pyrolyzed roasting system
The crystal form integrator of device is provided with air inlet and outlet and discharge port, is pyrolyzed the second cyclone trap of roasting system device
It is provided with air inlet and outlet and discharge port, wherein the afterbody in the feed inlet of dynamic roasting stove and multistage pre-heating system
Preheater discharge port is connected, and the air inlet of dynamic roasting stove and the second combustion furnace are connected, the air outlet and crystalline substance of dynamic roasting stove
The air inlet of type integrator is connected, and the air inlet of the air outlet of crystal form integrator and the second cyclone trap is connected, and second
The air outlet of cyclone trap is connected with the afterbody preheater air inlet of multistage pre-heating system, the discharging of crystal form integrator
The discharge port of mouth and the second cyclone trap is connected with feed bin, and the level-one preheater air outlet of multistage pre-heating system is sequentially connected in series
Heat exchanger (gas-gas heat exchange), the second trap, the second air-introduced machine, meanwhile, the second trap discharge port and the second feed screw
It is connected, the second feed screw discharge port is connected with the level-one preheater air inlet pipeline of multistage pre-heating system, each equipment
Connection type is to be connected by pipeline；
The multistage pre-heating system is at least three-level preheating；Wherein, preheaters at different levels are cyclone preheater, are provided with
Air inlet and outlet and discharge port, wherein the air outlet of two level preheater is connected with the air inlet of level-one preheater, and three-level is pre-
The air outlet of hot device is connected with the air inlet of two level preheater；The discharge port of level-one preheater and the air outlet of three-level preheater,
Pipeline between the air inlet of two level preheater is connected, the air outlet of the discharge port of two level preheater and the second cyclone trap,
Pipeline between the air inlet of three-level preheater is connected.
First trap is the first electric fishing storage or the first pouched trapper, and second trap is second
Electric fishing storage or the second pouched trapper.
The pneumatic convey drier carries dispersing device.
The heat source of the pneumatic convey drier is the first combustion furnace；
The heat source of the dynamic roasting stove is the second combustion furnace.
A kind of process of two step method production γ type aluminium oxide of the present invention is specifically included as follows using above-mentioned apparatus
Step：
Step 1. is dried
Aluminum Chloride Hexahydrate crystal is sent into pneumatic convey drier with charger, the dispersing device in pneumatic convey drier
It mechanical force and is passed through under the effect of hot gas wind-force Aluminum Chloride Hexahydrate crystal is broken up into drying, drying temperature control is 210 DEG C~260
DEG C, the aluminium chloride after being dried, and produce dry tail gas；
The hot gas is provided by the first combustion furnace, hot gas after specific fuel gas buring；
Step 2. preheats
Sequentially enter the first cyclone trap, the first trap under entrainment of the aluminium chloride by drying tail gas after drying, obtains
Drying tail gas to separation and the material that is captured；Wherein, the drying tail gas of separation is drawn through the first air-introduced machine and is emptied；
The material that is captured be sent by the first feed screw the level-one preheater air inlet for entering multistage pre-heating system and
Two level preheater air outlet is connected pipeline, is then preheated step by step, the material after being preheated and pre-heating system tail gas, material
Preheating temperature be 400~500 DEG C；
Step 3. pyrolysis roasting
Material after preheating is sent into dynamic roasting stove high-temperature roasting, and heat exchange is carried out with hot gas, and pyrolytic reaction, heat occurs
It is 900 DEG C~1100 DEG C to solve temperature, obtains γ type aluminium oxide；
Step 4. crystal is integrated
γ type aluminium oxide enters crystal form integrator and carries out crystal form integration, homogenizing, obtains the γ type aluminium oxide after crystal form is integrated
With the baking tail gases of separation；
The processing of step 5. baking tail gases
After the second cyclone trap traps feed separation, the afterbody into multistage pre-heating system preheats baking tail gases
The air inlet of device passes sequentially through the air inlet and outlet of each preheater, and pre-heating system finally is discharged from level-one preheater；
After the discharge of pre-heating system tail gas, exchange heat through heat exchanger, the tail gas detached through the second trap trapping material, point
From tail gas finally drawn by the second air-introduced machine and be sent into HCl absorption systems and make HCl recovery processings；Trapping material passes through the second spiral shell
Rotation feeder enters the pipeline that level-one preheater air inlet is connected with two level preheater air outlet.
The purpose of the step 1 is that the Aluminum Chloride Hexahydrate crystal broken up is with hot gas to realize heat exchange, removal six
The free moisture of water aluminium chloride crystal and most of crystallization water.
In the step 1, the drying uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
In the step 2, the multistage pre-heating system is at least concatenated three-level preheating method.
In the step 3, pyrolysis roasting uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
In the step 3, the hot gas is provided by the second combustion furnace, specially hot gas after fuel gas buring,
In, the combustion air of the second combustion furnace uses the hot-air that heat exchanger exchanges heat.
In the step 4, it is therefore intended that integrate the crystal form of γ type aluminium oxide so that the crystal form of γ type aluminium oxide
Tend to be uniform.
In the step 5, the heat exchange mode of the heat exchanger is gas-gas heat exchange.
In the step 5, the purpose that the baking tail gases after pyrolysis enter multistage pre-heating system is current-carrying and is that material is pre-
Heat provides heat.
γ type aluminium oxide prepared by the present invention, alumina content >=98%, alpha-type aluminum oxide content≤5%, burning decrement
≤ 1%, the volumetric concentration of baking tail gases HCl is up to 20%.
The process unit and method of a kind of two step method production γ type aluminium oxide of the present invention have compared with the prior art
Beneficial effect is：
(1) present invention can be avoided fundamentally produced by one-step technology using dry, pyrolysis roasting two-step process
Many production problems.
(2) using using the heat exchange of dilute phase current-carrying and negative-pressure operation mode, gas, solid two to be in contact fully, heat passes the present invention
It passs soon, process unit security performance and operating environment are good.
(3) present invention uses the pneumatic convey drier with dispersing device, and by independent combustion furnace heat supply, to strengthen material
Dispersion and drying efficiency；Dry hot gas is gas after burning, and basic over dry, drying temperature control is in 210 DEG C~260 DEG C ranges
It is interior, to realize that dehydration is without generating hydrolysis in low-temperature material drying process.
(4) material preheating of the present invention realizes baking tail gases heat using multistage preheating method to ensure material stepped heating
Echelon utilizes, and improves system thermal efficiency.
(5) present invention uses dynamic roasting stove, the independent heat supply of combustion furnace and the follow-up crystal form integrator mode of roaster, to protect
The pyrolysis of exhibit material is abundant, avoids alpha-type aluminum oxide from generating and tends to be uniform with the integration of product γ type aluminium oxide crystal forms.
(6) two step method production technology of the present invention, baking tail gases concentration containing HCl is high, and humidity is small, narrow-minded, so as to tail gas
HCl absorbs recovery processing, and scale of investment is small, and operating cost is small, while the influence corroded to equipment can be greatly reduced.
(7) present invention process device and method have built test battery device, have completed experimental stage at present, it was demonstrated that can push away
It is widely used in the large industrialized roasting of Aluminum Chloride Hexahydrate.
Description of the drawings
Fig. 1 is the process flow diagram that two step method of the embodiment of the present invention produces γ type aluminium oxide；
Wherein, 1 it is the first combustion furnace, 2 be charger, 3 be pneumatic convey drier, 4 be the first cyclone trap, 5 is the
One trap, 6 are the first feed screw, and 7 be the first air-introduced machine, and 8 be the second combustion furnace, 9 be dynamic roasting stove, 10 is crystal form
Integrator, 11 be the second cyclone trap, 12 be level-one preheater, 13 be two level preheater, 14 be three-level preheater, 15 be
Second trap, 16 second air-introduced machines, 17 are the second feed screw, and 18 be heat exchanger, and 19 be feed bin.
Specific implementation mode
With reference to embodiment, the present invention is described in further detail.
In following embodiment, the raw material used is Aluminum Chloride Hexahydrate crystal, water content：5~10% (wet basis), process unit
Treating capacity be：100kg/h.
For following embodiment by taking three-level pre-heating system as an example, the process flow diagram of two step method production γ type aluminium oxide is shown in figure
1。
Embodiment
A kind of process unit of two step method production γ type aluminium oxide, including drying system device and pyrolysis roasting system dress
It sets；
Wherein, the equipment that the drying system device includes is：First combustion furnace 1, charger 2, pneumatic convey drier
3, the first cyclone trap 4, the first trap 5, the first feed screw 6 and the first air-introduced machine 7；
The equipment that the pyrolysis roasting system device includes is：Second combustion furnace 8, dynamic roasting stove 9, crystal form integrator
10, the second cyclone trap 11, multistage pre-heating system, the second trap 15, the second air-introduced machine 16,17 and of the second feed screw
Heat exchanger 18；
Wherein, the multistage pre-heating system is that three preheaters are connected together in series, wherein preheating material first
First preheater be 12, second preheaters of level-one preheater be two level preheater 13, third preheater is that three-level is pre-
Hot device 14.
Wherein, the pneumatic convey drier 3 of drying system device is provided with air outlet, feed inlet, air inlet, drying system dress
The first cyclone trap 4 set is provided with air inlet and outlet and discharge port, and the first trap 5 is provided with air inlet and outlet
And discharge port, wherein 3 feed inlet of pneumatic convey drier is connected with charger 2, the air inlet of pneumatic convey drier 3 and first
Combustion furnace 1 is connected, the air inlet of the air outlet of pneumatic convey drier 3 and the first cyclone trap 4 is connected, and the first whirlwind is caught
Storage 4 is connected with the first trap 5, the first air-introduced machine 7 successively, meanwhile, the discharge port of the first cyclone trap 4 and the first trapping
5 discharge port of device is connected with the first feed screw 6,6 discharge port of the first feed screw and the level-one in three-level pre-heating system
The air inlet pipeline of preheater 12 is connected；Connection type between each equipment is to be connected by pipeline；
The dynamic roasting stove 9 of pyrolysis roasting system device is provided with feed inlet, air inlet and air outlet, is pyrolyzed roasting system
The crystal form integrator 10 of device is provided with air inlet and outlet and discharge port, the second whirlwind trapping of pyrolysis roasting system device
Device 11 is provided with air inlet and outlet and discharge port, wherein three in the feed inlet and three-level pre-heating system of dynamic roasting stove 9
Grade 14 discharge port of preheater is connected, and the air inlet of dynamic roasting stove 9 and the second combustion furnace 8 are connected, the outlet air of dynamic roasting stove 9
Mouth is connected with the air inlet of crystal form integrator 10, the air inlet of the air outlet of crystal form integrator 10 and the second cyclone trap 11
It is connected, the air outlet of the second cyclone trap 11 is connected with 14 air inlet of three-level preheater of three-level pre-heating system, crystal form
The discharge port of the discharge port of integrator 10 and the second cyclone trap 11 is connected with feed bin 19, and the level-one of three-level pre-heating system is pre-
12 air outlet of hot device is sequentially connected in series heat exchanger 18, the second trap 15, the second air-introduced machine 16, meanwhile, the discharging of the second trap 15
Mouth is connected with the second feed screw 17, the level-one preheater 12 of 17 discharge port of the second feed screw and multistage pre-heating system
Air inlet pipeline be connected, the connection type of each equipment is to be connected by pipeline；
The three-level pre-heating system preheats for three-level；Wherein, preheaters at different levels are cyclone preheater, are provided with air inlet
Mouth, air outlet and discharge port, wherein the air outlet of two level preheater 13 is connected with the air inlet of level-one preheater 12；Three-level is pre-
The air outlet of hot device 14 is connected with the air inlet of two level preheater 13, discharge port and the three-level preheater 14 of level-one preheater 12
Air outlet, two level preheater 13 air inlet between pipeline be connected, the trapping of the discharge port of two level preheater 13 and the second whirlwind
Pipeline between the air outlet of device 11, the air inlet of three-level preheater 14 is connected.
First trap is the first electric fishing storage, and second trap is the second electric fishing storage.
The pneumatic convey drier carries dispersing device.
The heat source of the pneumatic convey drier is the first combustion furnace.
The heat source of the dynamic roasting stove is the second combustion furnace.
Fuel：Natural gas
A kind of process of two step method production γ type aluminium oxide is specifically comprised the following steps using above-mentioned apparatus：
Step 1. is dried
Raw material Aluminum Chloride Hexahydrate crystal is sent into pneumatic convey drier 3 with charger 2, is led into pneumatic convey drier 3
Enter the hot gas generated through the first combustion furnace 1, dispersing device mechanical force of the raw material in pneumatic convey drier 3 and total with hot-air
Drying is broken up under same-action, drying temperature control is 210 DEG C~230 DEG C, the aluminium chloride after being dried, and generates drying
Tail gas；
It is intended that the Aluminum Chloride Hexahydrate crystal broken up carries out heat exchange with hot gas, to remove Aluminum Chloride Hexahydrate crystalline substance
The free moisture of body and most of crystallization water.
The drying uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
Step 2. preheats
Sequentially enter the first cyclone trap 4, the first trap 5 under entrainment of the aluminium chloride by drying tail gas after drying,
The drying tail gas detached and the material that is captured；Wherein, the drying tail gas of separation is drawn through the first air-introduced machine 7 and is emptied；
The material that is captured is sent into 12 air inlet of level-one preheater for entering multistage pre-heating system by the first feed screw 6
Be connected pipeline with 13 air outlet of two level preheater, is then preheated step by step, the material after being preheated and pre-heating system tail gas,
Be captured material preheating temperature be 400~450 DEG C；
Step 3. pyrolysis roasting
Material after preheating is sent into 9 high-temperature roasting of dynamic roasting stove, carries out heat exchange with hot gas gas, pyrolytic reaction occurs,
γ type aluminium oxide is obtained, the pyrolysis temperature of dynamic roasting stove is 900 DEG C~1100 DEG C；
The hot gas is provided by the second combustion furnace, specially hot gas after combustion of natural gas, wherein the second combustion furnace
Combustion air use the hot-air that exchanges heat of heat exchanger.
The pyrolysis roasting uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
Step 4. crystal is integrated
γ type aluminium oxide enters crystal form integrator 10 and carries out crystal form integration, homogenizing, obtains the γ types oxidation after crystal form is integrated
Aluminium and the baking tail gases detached；
The γ type aluminium oxide of preparation, alumina content >=98%, alpha-type aluminum oxide content≤5%, burning decrement≤1%.
The processing of step 5. baking tail gases
Baking tail gases are after the second cyclone trap 11 traps feed separation, into the three-level preheater of three-level pre-heating system
14 air inlet passes sequentially through the air inlet and outlet of each preheater, and pre-heating system tail finally is discharged from level-one preheater 12
Gas；
After the discharge of pre-heating system tail gas, exchange heat through heat exchanger 18, the tail detached through the second trap 15 trapping material
Gas, the tail gas of separation, which is finally drawn by the second air-introduced machine 16 and is sent into HCl absorption systems, makees HCl recovery processings；It is logical to trap material
It crosses the second feed screw 17 and enters the pipeline that 12 air inlet of level-one preheater is connected with 13 air outlet of two level preheater.
Wherein, in the baking tail gases after pyrolysis, the volumetric concentration of the HCl contained is 15~20%, tail gas humidity：It is wet to contain
Measure M=2%, exhaust gas amount：3100Nm3/h。
The heat exchange mode of the heat exchanger is gas-gas heat exchange, specially carries out cold air and the baking tail gases after pyrolysis
Indirect heat exchange, cold air become hot-air.
The purpose that baking tail gases after pyrolysis enter multistage pre-heating system is current-carrying and provides heat for material preheating.
Claims (10)
1. a kind of process unit of two step method production γ type aluminium oxide, which is characterized in that the two step method produces γ type aluminium oxide
Process unit includes drying system device and pyrolysis roasting system device；
The equipment that the drying system device includes is：First combustion furnace, charger, pneumatic convey drier, the first whirlwind are caught
Storage, the first trap, the first feed screw and the first air-introduced machine；
The equipment that the pyrolysis roasting system device includes is：Second combustion furnace, dynamic roasting stove, crystal form integrator, second
Cyclone trap, multistage pre-heating system, the second trap, the second air-introduced machine, the second feed screw and heat exchanger；
Wherein, the multistage pre-heating system is that multiple preheaters are connected together in series, wherein the of preheating material first
One preheater is level-one preheater, second preheater is two level preheater, third preheater is three-level preheater, successively
Analogize；
The pneumatic convey drier of drying system device is provided with air outlet, feed inlet, air inlet, the first rotation of drying system device
Wind trap is equipped with air inlet and outlet and discharge port, and the first trap is provided with air inlet and outlet and discharge port, wherein
Pneumatic convey drier feed inlet is connected with charger, and the air inlet of pneumatic convey drier and the first combustion furnace be connected, air-flow
The air inlet of the air outlet of formula drying machine and the first cyclone trap is connected, and the first cyclone trap is trapped with first successively
Device, the series connection of the first air-introduced machine, meanwhile, the discharge port of the first cyclone trap and the first trap discharge port are sent with the first spiral
Material machine is connected, and the first feed screw discharge port is connected with the air inlet pipeline of the level-one preheater in multistage pre-heating system；
Connection type between each equipment is connected for pipeline；
The dynamic roasting stove of pyrolysis roasting system device is provided with feed inlet, air inlet and air outlet, is pyrolyzed roasting system device
Crystal form integrator be provided with air inlet and outlet and discharge port, the second cyclone trap setting of pyrolysis roasting system device
There are air inlet and outlet and discharge port, wherein the afterbody preheating in the feed inlet of dynamic roasting stove and multistage pre-heating system
Device discharge port is connected, and the air inlet of dynamic roasting stove and the second combustion furnace are connected, and the air outlet and crystal form of dynamic roasting stove are whole
The air inlet of clutch is connected, and the air inlet of the air outlet of crystal form integrator and the second cyclone trap is connected, the second whirlwind
The air outlet of trap is connected with the afterbody preheater air inlet of multistage pre-heating system, the discharge port of crystal form integrator and
The discharge port of second cyclone trap is connected in feed bin；The level-one preheater air outlet of multistage pre-heating system is sequentially connected in series heat exchange
Device, the second trap, the second air-introduced machine, meanwhile, the second trap discharge port and the second feed screw are connected, and the second spiral is sent
Material machine discharge port is connected with the air inlet pipeline of the level-one preheater of multistage pre-heating system, and the connection type of each equipment is pipeline
It is connected.
2. the process unit of two step method production γ type aluminium oxide as described in claim 1, which is characterized in that the multistage is pre-
Hot systems are at least three-level preheating；Wherein, preheaters at different levels are cyclone preheater, are provided with air inlet and outlet and discharging
Mouthful, wherein the air outlet of two level preheater is connected with the air inlet of level-one preheater, and the air outlet and two level of three-level preheater are pre-
The air inlet of hot device is connected；The discharge port of level-one preheater and the air outlet of three-level preheater, two level preheater air inlet it
Between pipeline be connected, the air outlet of the discharge port of two level preheater and the second cyclone trap, the air inlet of three-level preheater it
Between pipeline be connected.
3. the process unit of two step method production γ type aluminium oxide as described in claim 1, which is characterized in that described first catches
Storage is the first electric fishing storage or the first pouched trapper, and second trap is that the second electric fishing storage or the second pocket type are caught
Storage.
4. the process unit of two step method production γ type aluminium oxide as described in claim 1, which is characterized in that the air-flowing type
Drying machine carries dispersing device；The heat source of the pneumatic convey drier is the first combustion furnace；The roaster is
The heat source of state roaster, dynamic roasting stove is the second combustion furnace.
5. a kind of process of two step method production γ type aluminium oxide, using process unit described in claim 1, feature exists
In including the following steps：
Step 1. is dried
Aluminum Chloride Hexahydrate crystal is sent into pneumatic convey drier with charger, the machinery of dispersing device in pneumatic convey drier
Power and be passed through under the collective effect of hot gas wind-force Aluminum Chloride Hexahydrate crystal broken up into drying, drying temperature control for 210 DEG C~
260 DEG C, the aluminium chloride after being dried, and produce dry tail gas；
The hot gas is provided by the first combustion furnace, specially fuel gas buring hot gas；
Step 2. preheats
Sequentially enter the first cyclone trap, the first trap under entrainment of the aluminium chloride by drying tail gas after drying, is divided
From drying tail gas and be captured material；Wherein, the drying tail gas of separation is drawn through the first air-introduced machine and is emptied；
The material that is captured is sent into the level-one preheater air inlet and two level for entering multistage pre-heating system by the first feed screw
The connected pipeline of preheater air outlet, is then preheated, the material after being preheated and pre-heating system tail gas step by step, material
Preheating temperature is 400~500 DEG C；
Step 3. pyrolysis roasting
Material after preheating is sent into dynamic roasting stove high-temperature roasting, and heat exchange is carried out with hot gas, and pyrolytic reaction, pyrolysis temperature occurs
Degree is 900 DEG C~1100 DEG C, obtains γ type aluminium oxide；
Step 4. crystal is integrated
γ type aluminium oxide enters crystal form integrator and carries out crystal form integration, homogenizing, obtains the γ types aluminium oxide after crystal form is integrated and divides
From baking tail gases；
The processing of step 5. baking tail gases
Baking tail gases are after the second cyclone trap traps feed separation, into the afterbody preheater of multistage pre-heating system
Air inlet passes sequentially through the air inlet and outlet of each preheater, and pre-heating system tail gas finally is discharged from level-one preheater；
It after the discharge of pre-heating system tail gas, exchanges heat through heat exchanger, then the tail gas detached through the second trap trapping material, separation
Tail gas finally drawn by the second air-introduced machine and be sent into HCl absorption systems and make HCl recovery processings；Trapping material passes through the second spiral
Feeder enters the pipeline that level-one preheater air inlet is connected with two level preheater air outlet.
6. the process of two step method production γ type aluminium oxide as claimed in claim 5, which is characterized in that the step 1
In, the drying uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
7. the process of two step method production γ type aluminium oxide as claimed in claim 5, which is characterized in that the step 3
In, pyrolysis roasting uses the heat exchange of dilute phase current-carrying and negative-pressure operation mode.
8. the process of two step method production γ type aluminium oxide as claimed in claim 5, which is characterized in that the step 3
In, the hot gas is provided by the second combustion furnace, specially fuel gas buring hot gas, wherein the combustion-supporting sky of the second combustion furnace
Gas uses the hot-air that heat exchanger exchanges heat.
9. the process of two step method production γ type aluminium oxide as claimed in claim 5, which is characterized in that the step 5
In, the heat exchange mode of the heat exchanger is gas-gas heat exchange.
10. the process of two step method production γ type aluminium oxide as claimed in claim 5, it is characterised in that：The γ types of preparation
The volume of aluminium oxide, alumina content >=98%, alpha-aluminium oxide content≤5%, burning decrement≤1%, baking tail gases HCl is dense
Degree is up to 20%.
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