CN114719607A - Aluminium hydroxide electrical heating roasting device - Google Patents

Aluminium hydroxide electrical heating roasting device Download PDF

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Publication number
CN114719607A
CN114719607A CN202210244416.2A CN202210244416A CN114719607A CN 114719607 A CN114719607 A CN 114719607A CN 202210244416 A CN202210244416 A CN 202210244416A CN 114719607 A CN114719607 A CN 114719607A
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China
Prior art keywords
steam
outlet
resistance furnace
roasting
heat exchanger
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Pending
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CN202210244416.2A
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Chinese (zh)
Inventor
马朝建
李志国
曹万秋
汪漪
陈国华
尹德明
姜跃华
郭沈
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Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd
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Shenyang Aluminium And Magnesium Engineering And Research Institute Co Ltd
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Priority to CN202210244416.2A priority Critical patent/CN114719607A/en
Publication of CN114719607A publication Critical patent/CN114719607A/en
Pending legal-status Critical Current

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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
    • F27B17/00—Furnaces of a kind not covered by any preceding group
    • F27B17/0016—Chamber type furnaces
    • 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
    • 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
    • C01F7/30—Preparation of aluminium oxide or hydroxide by thermal decomposition or by hydrolysis or oxidation of aluminium compounds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/004—Systems for reclaiming waste heat
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/10—Process efficiency
    • Y02P20/129—Energy recovery, e.g. by cogeneration, H2recovery or pressure recovery turbines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The invention relates to an aluminum hydroxide electric heating roasting device. The device comprises a bucket elevator, a locking feeding hopper is arranged below a discharge port of the bucket elevator, a material inlet of a decomposition resistance furnace is arranged below the locking feeding hopper, a material inlet of a roasting resistance furnace is arranged below a material outlet of the decomposition resistance furnace, a material inlet of a high-temperature cooler is arranged below the material outlet of the roasting resistance furnace, the high-temperature cooler is communicated with a fluidized bed cooler, a material outlet is arranged at the tail end of the fluidized bed cooler, a steam outlet of the decomposition resistance furnace is connected with a first steam desuperheater and a steam Roots blower, an outlet of the first steam desuperheater is connected with the steam desuperheater, an outlet of the steam Roots blower is respectively connected with steam inlets of the decomposition resistance furnace and the roasting resistance furnace, a steam outlet of the roasting resistance furnace is connected with a second steam desuperheater, an outlet of the second steam desuperheater is connected with the steam desuperheater, and the outlet of the steam desuperheater is connected with steam-solid. The invention realizes the zero-emission roasting process without smoke, dust and waste water.

Description

Aluminium hydroxide electrical heating roasting device
Technical Field
The invention relates to a static roasting device, in particular to an aluminum hydroxide electric heating roasting device in the technical field of aluminum oxide.
Background
In the production of alumina, the calcination of aluminum hydroxide is an essential and main energy-consuming process, and the energy consumption of the calcination accounts for about one third of that of the Bayer process. Currently, there are three fluidized roasting furnace devices widely used in industrial production in the world, and the annual production of alumina is about 1.5 hundred million tons. Namely: flash furnace FFC, Circulating fluidized furnace CFC, and Gas Suspension furnace GSC. All three roasting devices use fuel gas (such as natural gas, coal gas and the like) or fuel oil (such as heavy oil and the like) as fuel.
The principle of the existing fluidized roasting furnace is that aluminum hydroxide (Al)2O3.3H2O) is roasted by preheating and heating (about 1000 ℃) to complete drying, crystal water removal and crystal form transformation, and an aluminum oxide product is obtained after cooling; and flue gas generated in the roasting process enters a dust remover for further dust collection and is discharged into the atmosphere through a chimney. The final waste gas in the roasting process has the temperature of about 150 ℃, the water content of more than 50 percent and CO2The average content is about 5% depending on the fuel. Therefore, the existing fluidized roasting furnace inevitably has a large amount of steam and CO2And heat is discharged into the atmosphere along with waste gas, which wastes energy and pollutes the environment.
Disclosure of Invention
In order to solve the technical problems, the invention provides aluminum hydroxideThe electric heating roasting device aims at: electric heating instead of existing fuel heating to calcine aluminium hydroxide (Al)2O3.3H2O), the roasting of the aluminum hydroxide is completed, and the crystal water and attached water in the aluminum hydroxide are recovered in a steam form; greatly reduces the heat consumption in the roasting process and realizes the smokeless, dustless and wastewater-free zero-emission green roasting process.
The invention is realized by the following steps:
an aluminum hydroxide electric heating roasting device comprises a bucket elevator, wherein a pressure-locking feeding hopper is arranged below a discharge port of the bucket elevator, a material inlet of a decomposition resistance furnace is arranged below the pressure-locking feeding hopper, a material inlet of the roasting resistance furnace is arranged below a material outlet of the decomposition resistance furnace, a material inlet of a high-temperature cooler is arranged below a material outlet of the roasting resistance furnace, the high-temperature cooler is communicated with a fluidized bed cooler, a material outlet is arranged at the tail end of the fluidized bed cooler, a steam outlet of the decomposition resistance furnace is connected with a first steam desuperheater and a steam Roots blower, the outlet of the first steam desuperheater is connected with a steam desuperheater, the outlet of the steam blower is respectively connected with steam inlets of the decomposition resistance furnace and the roasting resistance furnace, the steam outlet of the roasting resistance furnace is connected with a second steam desuperheater, the outlet of the second steam desuperheater is connected with the steam desuperheater, and the outlet of the steam desuperheater is connected with a steam-solid separator.
The two pressure-locking feeding hoppers are mutually standby, and a steam flow dryer is arranged between the pressure-locking feeding hopper and the material inlet of the decomposition resistance furnace.
The pressure-locking feeding hopper is filled with partial steam from a steam outlet of the decomposition resistance furnace, and the working pressure in the pressure-locking feeding hopper is 0.4-0.8 MPa.
The decomposition resistance furnace removes attached water and part of crystal water in the aluminum hydroxide at the temperature of 450-550 ℃, and collects the attached water and part of crystal water in the aluminum hydroxide in the form of superheated steam, the steam pressure is 0.8MPa, and the decomposition resistance furnace is a cylindrical pressure container of 0.4-0.8 MPa.
The roasting resistance furnace is roasted at 850-950 ℃, and is a cylindrical pressure container with 0.4-0.8 MPa.
And a high-temperature rotary valve is arranged between the roasting resistance furnace material outlet and the high-temperature cooler material inlet.
The high-temperature cooler is internally provided with a high-temperature heat exchanger which is vertical, the fluidized bed cooler communicated with the high-temperature cooler is internally provided with a saturated steam heat exchanger and a soft water heat exchanger which are horizontal.
And a fluidized air inlet of the fluidized bed cooler is connected with a fluidized centrifugal fan.
The soft water heat exchanger is connected with soft water, a soft water outlet of the soft water heat exchanger is connected with a steam drum arranged outside the fluidized bed cooler, and steam outlet of the steam drum is connected with a steam inlet of the saturated steam heat exchanger and a steam inlet of the high-temperature heat exchanger.
The steam outlet of the saturated steam heat exchanger is connected with the steam drum, and the steam outlet of the high-temperature heat exchanger is connected with the steam temperature and pressure reducer.
And the soft water is sent to the first steam desuperheater, the second steam desuperheater and the steam desuperheater.
The fluidized air outlet of the fluidized bed cooler is connected with a gas-solid separator which is a metal fiber bag dust remover and is a normal pressure container.
The steam-solid separator is a metal fiber bag dust remover and is a 0.8MPa pressure container.
The solid separated by the steam-solid separator is sent to a fluidized bed cooler, and the superheated steam is sent to other steam consuming processes in the alumina production.
The invention has the advantages and effects that: the invention uses electric heating to replace the existing fuel heating to roast aluminum hydroxide (Al)2O3.3H2O), the roasting of the aluminum hydroxide is completed, and the crystal water and attached water in the aluminum hydroxide are recovered in a steam form; not only greatly reduces the heat consumption in the roasting process, but also realizes the zero-discharge roasting process without smoke, dust and waste water.
The aluminum hydroxide roasting process for producing aluminum oxide is completed by adopting an aluminum hydroxide electric heating roasting device, and the theoretical power consumption of each ton of aluminum oxide produced is about 800kW.h/t-Al2O3Superheated steam (250 ℃ C.) is produced0.8 MPa) about 0.9 ton/t-Al2O3The direct theoretical heat consumption of the roasting process is about 2.7GJ/t-Al2O3Down to about 0.135 GJ/t-Al2O3(electric heating load-steam generated heat).
Compared with the existing fuel heating fluidized roasting furnace, the roasting heat consumption is reduced by 2.5GJ/t-Al for producing one ton of alumina2O3Above, CO2The average reduction of the emission (which varies with the fuel) is about 0.2t/t-Al2O3. Thus, the heat consumption is saved and the environmental pollution is solved.
Drawings
Fig. 1 is a block diagram of the present invention.
In the figure: 1. a bucket elevator; 2. locking and pressing the feeding hopper; 3. decomposing the resistance furnace; 4. roasting the resistance furnace; 5. a fluidized bed cooler; 6. a steam Roots blower; 7. a first steam desuperheater; 8. a steam temperature and pressure reducer; 9. a fluidized centrifugal fan; 10. a high temperature rotary valve; 11. a vapor-solid separator; 12. a steam drum, 13, a high-temperature cooler, 14, a gas-solid separator, 15 and a steam flow dryer; 16. a second steam desuperheater; 17. a high temperature heat exchanger; 18. a saturated steam heat exchanger; 19. a soft water heat exchanger.
The specific implementation mode is as follows:
the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some 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 any inventive step based on the embodiments of the present invention, belong to the scope of the present invention.
As shown in the figure, the aluminum hydroxide electric heating roasting device comprises a bucket elevator 1, a locking feeding hopper 2 is arranged below a discharge port of the bucket elevator 1, a material inlet of a decomposition resistance furnace 3 is arranged below the locking feeding hopper 2, a material inlet of a roasting resistance furnace 4 is arranged below a material outlet of the decomposition resistance furnace 3, a material inlet of a high-temperature cooler 13 is arranged below a material outlet of the roasting resistance furnace 4, the high-temperature cooler 13 is communicated with a fluidized bed cooler 5, the tail end of the fluidized bed cooler 5 is a material outlet, a steam outlet of the decomposition resistance furnace 3 is connected with a first steam desuperheater 7 and a steam Roots blower 6, an outlet of the first steam desuperheater 7 is connected with a steam desuperheater 8, an outlet of the steam Roots blower 6 is respectively connected with steam inlets of the decomposition resistance furnace 3 and the roasting resistance furnace 4, a steam outlet of the roasting resistance furnace 4 is connected with a second steam desuperheater 16, the outlet of the second steam temperature reducer 16 is connected with the steam temperature reducer 8, and the outlet of the steam temperature reducer 8 is connected with the steam-solid separator 11.
The two pressure-locking feeding hoppers 2 are mutually standby, a steam flow dryer 15 is arranged between the pressure-locking feeding hopper 2 and the material inlet of the decomposition resistance furnace 3, and attached water is removed from the steam flow dryer 15.
The pressure-locking feeding hopper 2 is filled with partial steam from a steam outlet of the decomposition resistance furnace 3, and the working pressure in the pressure-locking feeding hopper 2 is 0.4-0.8 MPa.
The decomposition resistance furnace 3 further removes most of crystal water in the aluminum hydroxide at the temperature of 450-550 ℃, and the crystal water is collected in the form of superheated steam, the steam pressure is 0.8MPa, and the decomposition resistance furnace 3 is a cylindrical pressure container of 0.4-0.8 MPa.
The roasting resistance furnace 4 is roasted at 850-950 ℃, a small amount of crystal water of aluminum hydroxide is removed in the roasting resistance furnace, and the roasting resistance furnace 4 is a cylindrical pressure container with 0.4-0.8 MPa.
A high-temperature rotary valve 10 is arranged between the material outlet of the roasting resistance furnace 4 and the material inlet of the high-temperature cooler 13.
The high-temperature cooler 13 is internally provided with a high-temperature heat exchanger 17, the high-temperature heat exchanger 17 is vertical, the fluidized bed cooler 5 communicated with the high-temperature cooler 13 is internally provided with a saturated steam heat exchanger 18 and a soft water heat exchanger 19, and the saturated steam heat exchanger 18 and the soft water heat exchanger 19 are horizontal.
The fluidized bed cooler 5 is connected with a fluidized centrifugal fan 9 at a fluidized air inlet.
The soft water heat exchanger 19 is connected with soft water, the soft water outlet of the soft water heat exchanger 19 is connected with the steam drum 12 arranged outside the fluidized bed cooler 5, and the steam outlet of the steam drum 12 is connected with the steam inlet of the saturated steam heat exchanger 18 and the steam inlet of the high-temperature heat exchanger 17. The steam drum 12 is used to control and regulate the quality of the superheated steam produced by the fluidized bed cooler.
The steam outlet of the saturated steam heat exchanger 18 is connected with the steam drum 12, and the steam outlet of the high-temperature heat exchanger 17 is connected with the steam temperature and pressure reducer 8.
Said soft water is fed to the first steam desuperheater 7, the second steam desuperheater 16 and the steam desuperheater 8.
The fluidized air outlet of the fluidized bed cooler 5 is connected with a gas-solid separator 14, and the gas-solid separator 14 is a metal fiber bag dust remover and is a normal pressure container.
The steam-solid separator 11 is a metal fiber bag dust collector, and the steam-solid separator is a 0.8MPa pressure container. Separating a small amount of powder in the superheated steam from the superheated steam or hot air to make the dust content of the superheated steam product less than 10mg/m3。
The solid separated by the steam-solid separator 11 is sent to the fluidized bed cooler 5, and the superheated steam is sent to other steam consuming processes in the alumina production.
The working principle of the invention is as follows:
quantitative aluminum hydroxide raw materials enter a bucket elevator 1, are lifted by the bucket elevator 1 to enter a pressure locking feeding hopper 2, and each pressure locking feeding hopper 2 is connected with an overheated steam pipe to form a pressure balance system, so that the aluminum hydroxide raw materials can be smoothly fed into a decomposition resistance furnace through a steam flow dryer 15 by means of gravity. The two pressure-locking feeding hoppers 2 are used alternately to ensure continuous feeding, the materials enter a decomposition resistance furnace 3, and aluminum hydroxide (Al) is removed2O3.3H2O) and collecting most of crystal water in the form of superheated steam, feeding the material from the decomposition resistance furnace 3 to the roasting resistance furnace 4, and adjusting the temperature and the residence time in the roasting resistance furnace 4 to obtain the gamma-Al2O3And alpha-Al2O3To meet the product quality requirements. The material enters a high-temperature cooler 13 from the roasting resistance furnace 4 through the control and adjustment of the high-temperature rotary valve 10. The material is discharged from the high temperature cooler 13 through the fluidized bed cooler 5. The fluidized centrifugal fan 9 sprays a small amount of air into the fluidized bed cooler 5To assist the flow and heat exchange of the high temperature alumina. The high temperature cooler 13 and the high temperature heat exchanger 17, the saturated steam heat exchanger 18 and the soft water heat exchanger 19 in the fluidized bed cooler 5 cool the calcined high temperature alumina to recover heat. The high temperature heat exchanger 17, the saturated steam heat exchanger 18 and the soft water heat exchanger 19 are externally provided with fluidized high temperature alumina, the high temperature heat exchanger 17 is internally provided with steam, the saturated steam heat exchanger 18 is internally provided with water and steam, and the soft water heat exchanger 19 is internally provided with soft water. The alumina is used as a product after being cooled, and the soft water and the steam absorb heat to produce superheated steam which is mixed with the superheated steam produced by the decomposition resistance furnace 3 and the roasting resistance furnace 4 for utilization. The high-temperature alumina is sequentially subjected to countercurrent heat exchange with steam and water to reduce the temperature, and then discharged as a low-temperature (about 80 ℃) product, and soft water and steam are sequentially subjected to countercurrent heat exchange with the high-temperature alumina to be produced as superheated steam and are connected into the steam temperature and pressure reducer 8.
The steam Roots blower 6 is used for providing recycled superheated steam for the decomposition resistance furnace 3 and the roasting resistance furnace 4 so as to fluidize powder materials and assist the heat transfer process in the decomposition resistance furnace 3 and the roasting resistance furnace 4. Superheated steam produced by the decomposition resistance furnace 3 is used as fluidized air, a superheated steam circulation loop is arranged, and the pressure of a steam Roots blower is increased to fluidize materials in the resistance furnace.
The first steam desuperheater 7 and the second steam desuperheater 16 are used for the first water spraying and temperature reduction of high-temperature superheated steam generated by the decomposition resistance furnace 3 and the roasting resistance furnace 4 so as to enable the high-temperature superheated steam to reach the same temperature basically.
The steam temperature and pressure reducer 8 reduces the temperature and the pressure for the second time so as to accurately control and adjust the quality of the produced superheated steam, namely the superheated temperature and the pressure.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (14)

1. An aluminum hydroxide electric heating roasting device is characterized by comprising a bucket elevator, wherein a locking feeding hopper is arranged below a discharge port of the bucket elevator, a material inlet of a decomposition resistance furnace is arranged below the locking feeding hopper, a material inlet of a roasting resistance furnace is arranged below a material outlet of the decomposition resistance furnace, a material inlet of a high-temperature cooler is arranged below a material outlet of the roasting resistance furnace, the high-temperature cooler is communicated with a fluidized bed cooler, a material outlet is arranged at the tail end of the fluidized bed cooler, a steam outlet of the decomposition resistance furnace is connected with a first steam desuperheater and a steam Roots blower, an outlet of the first steam desuperheater is connected with a steam desuperheater, an outlet of the steam Roots blower is respectively connected with steam inlets of the decomposition resistance furnace and the roasting resistance furnace, a steam outlet of the roasting resistance furnace is connected with a second steam desuperheater, an outlet of the second steam desuperheater is connected with the steam desuperheater, the outlet of the steam temperature and pressure reducing device is connected with the steam-solid separator.
2. The aluminum hydroxide electric heating roasting device of claim 1, wherein the two pressure-locking feeding hoppers are mutually standby, and a steam flow dryer is arranged between the pressure-locking feeding hopper and the material inlet of the decomposition resistance furnace.
3. The aluminum hydroxide electric heating roasting device of claim 2, wherein the pressure-locking feeding hopper is fed with part of steam from a steam outlet of the decomposition resistance furnace, and the working pressure in the pressure-locking feeding hopper is 0.4-0.8 MPa.
4. The aluminum hydroxide electric heating roasting device of claim 1, characterized in that the decomposition resistance furnace removes the attached water and part of the crystal water in the aluminum hydroxide at 450-550 ℃, and collects the removed water in the form of superheated steam, the steam pressure is 0.8MPa, and the decomposition resistance furnace is a cylindrical pressure vessel of 0.4-0.8 MPa.
5. The electric heating aluminum hydroxide roasting device as set forth in claim 1, wherein the roasting resistance furnace is a cylindrical pressure vessel of 0.4-0.8 MPa and is roasted at 850 ℃ -950 ℃.
6. The aluminum hydroxide electric heating roasting device of claim 5, wherein a high temperature rotary valve is arranged between the roasting resistance furnace material outlet and the high temperature cooler material inlet.
7. The aluminum hydroxide electric heating roasting device according to claim 6, wherein the high temperature cooler is internally provided with a high temperature heat exchanger, the high temperature heat exchanger is vertical, the fluidized bed cooler communicated with the high temperature cooler is internally provided with a saturated steam heat exchanger and a soft water heat exchanger, and the saturated steam heat exchanger and the soft water heat exchanger are horizontal.
8. The aluminum hydroxide electric heating roasting device of claim 7, wherein the fluidized bed cooler fluidizing air inlet is connected with a fluidizing centrifugal fan.
9. An electric heating and calcining apparatus for preparing Al hydroxide according to claim 7, wherein the soft water heat exchanger is connected to soft water, the soft water outlet of said heat exchanger is connected to the steam drum outside the fluidized-bed cooler, and the steam outlet of said steam drum is connected to the steam inlets of saturated steam heat exchanger and high-temp heat exchanger.
10. The aluminum hydroxide electric heating roasting device according to claim 9, wherein a steam outlet of the saturated steam heat exchanger is connected with a steam drum, and a steam outlet of the high-temperature heat exchanger is connected with a steam temperature and pressure reducing device.
11. An apparatus as claimed in claim 7, wherein the soft water is supplied to the first steam desuperheater, the second steam desuperheater and the steam desuperheater.
12. The aluminum hydroxide electric heating roasting device according to claim 8, wherein the fluidized air outlet of the fluidized bed cooler is connected with a gas-solid separator, and the gas-solid separator is a metal fiber bag dust remover and is a normal pressure container.
13. The aluminum hydroxide electric heating roasting device according to claim 1, wherein the vapor-solid separator is a metal fiber bag dust remover, and the vapor-solid separator is a 0.8MPa pressure vessel.
14. An electrically heated aluminium hydroxide roasting apparatus as claimed in claim 13 in which the solids separated by the vapour-solid separator are passed to a fluidised bed cooler and the superheated steam is passed to other steam consuming processes in the production of aluminium oxide.
CN202210244416.2A 2022-03-14 2022-03-14 Aluminium hydroxide electrical heating roasting device Pending CN114719607A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210244416.2A CN114719607A (en) 2022-03-14 2022-03-14 Aluminium hydroxide electrical heating roasting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202210244416.2A CN114719607A (en) 2022-03-14 2022-03-14 Aluminium hydroxide electrical heating roasting device

Publications (1)

Publication Number Publication Date
CN114719607A true CN114719607A (en) 2022-07-08

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Application Number Title Priority Date Filing Date
CN202210244416.2A Pending CN114719607A (en) 2022-03-14 2022-03-14 Aluminium hydroxide electrical heating roasting device

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