CN113856221A - High-efficiency evaporator for system for preparing high-whiteness aluminum hydroxide by Bayer process and working method - Google Patents
High-efficiency evaporator for system for preparing high-whiteness aluminum hydroxide by Bayer process and working method Download PDFInfo
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- CN113856221A CN113856221A CN202111246403.0A CN202111246403A CN113856221A CN 113856221 A CN113856221 A CN 113856221A CN 202111246403 A CN202111246403 A CN 202111246403A CN 113856221 A CN113856221 A CN 113856221A
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- liquid separation
- aluminum hydroxide
- vapor
- separation chamber
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- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 title claims abstract description 42
- 238000004131 Bayer process Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000000926 separation method Methods 0.000 claims abstract description 44
- 238000001704 evaporation Methods 0.000 claims abstract description 34
- 230000008020 evaporation Effects 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 238000009826 distribution Methods 0.000 claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 230000005484 gravity Effects 0.000 claims abstract description 5
- 239000012452 mother liquor Substances 0.000 claims description 18
- 238000001556 precipitation Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000010865 sewage Substances 0.000 claims description 12
- 238000006477 desulfuration reaction Methods 0.000 claims description 9
- 230000023556 desulfurization Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 4
- 239000003712 decolorant Substances 0.000 claims description 3
- 238000004042 decolorization Methods 0.000 claims description 3
- 230000003009 desulfurizing effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000011017 operating method Methods 0.000 claims 3
- 229910021502 aluminium hydroxide Inorganic materials 0.000 claims 1
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- ANBBXQWFNXMHLD-UHFFFAOYSA-N aluminum;sodium;oxygen(2-) Chemical compound [O-2].[O-2].[Na+].[Al+3] ANBBXQWFNXMHLD-UHFFFAOYSA-N 0.000 description 3
- 229910001388 sodium aluminate Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000002207 thermal evaporation Methods 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- 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
- C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
- C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
Abstract
The invention discloses a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process and a working method, and relates to the technical field of aluminum hydroxide production. The invention comprises a heating evaporation chamber, a vapor-liquid separation chamber, a circulating pipe and a condensing pipe; a distribution disc is arranged at the upper half part in the heating evaporation chamber; a plurality of distribution holes are uniformly formed in the distribution disc; a tube plate is arranged below the distribution plate; a plurality of air holes are uniformly formed in the tube plate; a condensing pipe is communicated below the air hole; a black liquid pipe is arranged at the center of the pipe plate; the top end of the vapor-liquid separation chamber is sleeved at the opening of the heating evaporation chamber; the bottom of the gas-liquid separation chamber is communicated with a circulating pipe; one end of the circulating pipe passes through the gas-liquid separation chamber and is communicated with the bottom end of the black liquor pipe. According to the invention, the red mud is transported through the plurality of spiral condensing tubes in the high-efficiency evaporator, and is heated by external steam under the action of gravity, so that the red mud is evaporated and thickened, and a concentrated solution is obtained at the bottom, thus the heat transfer coefficient is improved, the retention time is short, the red mud is prevented from being woven, and the production cost is reduced.
Description
Technical Field
The invention belongs to the technical field of aluminum hydroxide production, and particularly relates to a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process and a working method.
Background
The basic principle of the Bayer process is that concentrated sodium hydroxide solution is used for converting aluminum hydroxide into sodium aluminate, aluminum hydroxide is separated out again by dilution and addition of aluminum hydroxide seed crystals, and the remaining sodium hydroxide solution is reused for treating the next batch of bauxite, so that continuous production is realized.
In the existing production process, when sodium aluminate is hydrolyzed into sodium hydroxide, most of the sodium aluminate needs to be hydrolyzed by adopting a combination of refrigeration equipment and heating equipment, the method has high energy consumption, and the hydrolysis process is maintained at about 30 ℃ without a definite value, so the production cost is greatly increased by adopting the refrigeration equipment and the heating equipment.
Disclosure of Invention
The invention aims to provide a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process and a working method.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process, which comprises a heating evaporation chamber, a vapor-liquid separation chamber, a circulating pipe and a condensing pipe, wherein the heating evaporation chamber is an inverted cylinder; a distribution disc is arranged at the upper half part in the heating evaporation chamber; a plurality of distribution holes are uniformly formed in the distribution disc; a tube plate is arranged below the distribution disc; a plurality of air holes are uniformly formed in the tube plate; a condensing pipe is communicated below the air hole; a black liquid pipe is arranged at the center of the tube plate; the vapor-liquid separation chamber is an inverted cone-shaped chamber body; the top end of the vapor-liquid separation chamber is sleeved at the opening of the heating evaporation chamber; the bottom of the vapor-liquid separation chamber is communicated with a circulating pipe; one end of the circulating pipe penetrates through the gas-liquid separation chamber and is communicated with the bottom end of the black liquor pipe; the condensation pipe is a spiral pipe body; the lower end of the condensing pipe is flush with the opening at the lower end of the heating evaporation chamber.
As a preferable technical scheme, a first steam pipe is arranged on one side of the heating evaporation chamber; the first steam pipe is used for conveying steam to the heating evaporation chamber; a condensate pipe is arranged at the bottom of the heating evaporation chamber; one end of the condensate pipe penetrates through the vapor-liquid separation chamber and is arranged outside the vapor-liquid separation chamber.
As a preferred technical scheme, a ring of annular plates are arranged between the outer edge of the open end of the thermal evaporation chamber and the inner wall of the vapor-liquid separation chamber; and a plurality of demisters are arranged on the ring-shaped plate.
As a preferable technical scheme, the upper half part of the vapor-liquid separation chamber is provided with a second vapor pipe; the lower half part of the vapor-liquid separation chamber is provided with a black liquor outlet pipe; the second steam pipe is located right above the demister.
As a preferable technical proposal, the circulating pipe is provided with a circulating pump; and a black liquor inlet pipe is also arranged on a pipeline between the circulating pump and the steam-liquid separation chamber.
The invention relates to a working method of a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process, which comprises the following steps:
step S1: pretreating seed precipitation mother liquor obtained by a Bayer process;
step S2: sending the seed precipitation mother liquor after pretreatment into a high-efficiency evaporator for treatment;
step S3: decomposing the slurry treated by the evaporator;
step S4: filtering and washing the decomposed slurry to obtain aluminum hydroxide;
step S5: and finishing the obtained aluminum hydroxide to obtain the high-whiteness aluminum hydroxide.
As a preferable technical solution, in the step S1, the pretreatment of the seed precipitation mother liquor includes desulfurization treatment, deferrization treatment and decolorization treatment, and the specific treatment steps are as follows:
step S11: pouring the seed precipitation mother liquor into a desulfurization reaction tank, and adding a desulfurizing agent into the tank;
step S12: the bottom flow flows into a sewage tank;
step S13: the desulfurization settling tank overflows to a deferrization reaction tank, and a deferrization agent is added into the tank;
step S14: flowing into a deferrization settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S15: the deferrization settling tank overflows to a decoloration reaction tank, and a decolorant is added into the tank;
step S16: flowing into a decoloring settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S17: and the sewage tank obtains Bayer process red mud washing through a sixth storage tank.
As a preferred technical solution, in step S2, the process of the high-efficiency evaporator is as follows: the red mud to be evaporated enters from a black liquor inlet pipe through a circulating pump and enters a vapor-liquid separation chamber through a circulating pipe, the red mud flows down a condensing pipe by virtue of gravity, when the red mud flows in the condensing pipe, the red mud is added by steam outside the pipe, evaporation is generated after the red mud reaches an evaporation temperature, the red mud and secondary steam flow down from the pipe to serve as heating steam, the secondary steam is condensed into water after heat exchange, and the water is discharged out of the vapor-liquid separation chamber.
As a preferred technical solution, in the step S5, the steps of finishing to obtain high-whiteness aluminum hydroxide are as follows:
step S51: drying the aluminum hydroxide;
step S52: performing cyclone dust collection and cloth bag dust collection on the dried aluminum hydroxide;
step S53: filtering, recovering and packaging cyclone dust-collected powder by a micro powder sieve;
step S54: and filtering, recovering and packaging the powder collected by the cloth bag by using a centrifugal sieve.
The invention has the following beneficial effects:
according to the invention, the red mud is transported through the plurality of spiral condensing tubes in the high-efficiency evaporator, and is heated by external steam under the action of gravity, so that the red mud is evaporated and thickened, and a concentrated solution is obtained at the bottom, thus the heat transfer coefficient is improved, the retention time is short, the red mud is prevented from being woven, and the production cost is reduced.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of the internal structure of a high-efficiency evaporator according to the present invention;
FIG. 2 is a schematic structural view of a distribution plate and a tube sheet;
FIG. 3 is a flow diagram of a pretreatment of seed precipitation mother liquor;
FIG. 4 is a diagram showing the steps for finishing to obtain high-whiteness aluminum hydroxide;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the invention is a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a bayer process, comprising a heating evaporation chamber 1, a vapor-liquid separation chamber 2, a circulating pipe 3 and a condensing pipe 4, wherein the heating evaporation chamber 1 is an inverted cylinder; a distribution plate 5 is arranged at the upper part in the heating evaporation chamber 1; a plurality of distribution holes 501 are uniformly formed in the distribution plate 5; a tube plate 6 is arranged below the distribution plate 5; a plurality of air holes 601 are uniformly formed in the tube plate 6; the condensing pipe 4 is communicated with the lower part of the air hole 601, the condensing pipe 4 is a spiral pipeline, when the seed precipitation mother liquor moves downwards in the spiral pipeline, the seed precipitation mother liquor can slowly flow downwards in the spiral pipeline under the action of gravity, and the moving path of the spiral pipeline through which the seed precipitation mother liquor passes is enlarged, so that the seed precipitation mother liquor in the spiral pipeline is dried for a longer time, and the drying is more sufficient; a black liquid pipe 602 is arranged at the center of the tube plate 6; the vapor-liquid separation chamber 2 is an inverted cone-shaped chamber body; the top end of the vapor-liquid separation chamber 2 is sleeved at the opening of the heating evaporation chamber 1; the bottom of the gas-liquid separation chamber 2 is communicated with a circulating pipe 3; one end of the circulating pipe 3 passes through the gas-liquid separation chamber 2 and is communicated with the bottom end of the black liquor pipe 602; the condensation pipe 4 is a spiral pipe body; the lower end of the condensation pipe 4 is flush with the opening at the lower end of the heating and evaporating chamber 1. A first steam pipe 101 is arranged on one side of the heating evaporation chamber 1; the first steam pipe 101 is used for conveying steam to the heating evaporation chamber 1; a condensate pipe 102 is arranged at the bottom of the heating evaporation chamber 1; one end of the condensate pipe 102 passes through the vapor-liquid separation chamber 2 and is disposed outside the vapor-liquid separation chamber 2. A ring of annular plates 7 are arranged between the outer edge of the opening end of the thermal evaporation chamber 1 and the inner wall of the vapor-liquid separation chamber 2; the annular plate 7 is provided with a plurality of demisters 701, and the demisters 701 remove mist in the vapor-liquid separation chamber 2. The upper half part of the vapor-liquid separation chamber 2 is provided with a second vapor pipe 201; the lower half part of the vapor-liquid separation chamber 2 is provided with a black liquor outlet pipe 202; the second steam pipe 201 is located directly above the demister 701.
The circulating pipe 3 is provided with a circulating pump 8; a black liquor inlet pipe 801 is further arranged on a pipeline between the circulating pump 8 and the vapor-liquid separation chamber 2, and the black liquor inlet pipe 801 is used for inputting seed precipitation mother liquor to be evaporated.
The invention relates to a working method of a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process, which comprises the following steps:
step S1: pretreating seed precipitation mother liquor obtained by a Bayer process;
step S2: sending the seed precipitation mother liquor after pretreatment into a high-efficiency evaporator for treatment;
step S3: decomposing the slurry treated by the evaporator;
step S4: filtering and washing the decomposed slurry to obtain aluminum hydroxide;
step S5: and finishing the obtained aluminum hydroxide to obtain the high-whiteness aluminum hydroxide.
Referring to fig. 3, in step S1, the pretreatment of the seed precipitation mother liquor includes desulfurization, deferrization and decolorization, and the specific treatment steps are as follows:
step S11: pouring the seed precipitation mother liquor into a desulfurization reaction tank, and adding a desulfurizing agent into the tank;
step S12: the bottom flow flows into a sewage tank;
step S13: the desulfurization settling tank overflows to a deferrization reaction tank, and a deferrization agent is added into the tank;
step S14: flowing into a deferrization settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S15: the deferrization settling tank overflows to a decoloration reaction tank, and a decolorant is added into the tank;
step S16: flowing into a decoloring settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S17: and the sewage tank obtains Bayer process red mud washing through a sixth storage tank.
In step S2, the high-efficiency evaporator processing is as follows: the red mud to be evaporated enters from a black liquor inlet pipe 801 through a circulating pump and enters into a vapor-liquid separation chamber 2 through a circulating pipe 3, the red mud flows down a condensation pipe 4 by virtue of attraction, when the red mud flows in the condensation pipe 4, the red mud is added by steam outside the pipe, evaporation is generated after the evaporation temperature is reached, the red mud and secondary steam flow down from the pipe to serve as heating steam, the secondary steam is condensed into water after heat exchange, and the water is discharged out of the vapor-liquid separation chamber 2.
Referring to fig. 4, in step S5, the steps of finishing to obtain high-whiteness aluminum hydroxide are as follows:
step S51: drying the aluminum hydroxide;
step S52: performing cyclone dust collection and cloth bag dust collection on the dried aluminum hydroxide;
step S53: filtering, recovering and packaging cyclone dust-collected powder by a micro powder sieve;
step S54: and filtering, recovering and packaging the powder collected by the cloth bag by using a centrifugal sieve.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. The utility model provides a bayer legal system is made high-efficient evaporimeter for high white aluminium hydroxide system, includes heating evaporation chamber (1), vapour-liquid separation room (2), circulating pipe (3) and condenser pipe (4), its characterized in that:
the heating evaporation chamber (1) is an inverted cylinder; a distribution plate (5) is arranged at the upper half part in the heating evaporation chamber (1); a plurality of distribution holes (501) are uniformly formed in the distribution disc (5); a tube plate (6) is arranged below the distribution disc (5); a plurality of air holes (601) are uniformly formed in the tube plate (6); a condensing pipe (4) is communicated below the air hole (601); a black liquid pipe (602) is arranged at the center of the tube plate (6);
the vapor-liquid separation chamber (2) is an inverted cone-shaped chamber body; the top end of the vapor-liquid separation chamber (2) is sleeved at the opening of the heating evaporation chamber (1); the bottom of the vapor-liquid separation chamber (2) is communicated with a circulating pipe (3); one end of the circulating pipe (3) penetrates through the vapor-liquid separation chamber (2) and is communicated with the bottom end of the black liquor pipe (602);
the condensation pipe (4) is a spiral pipe body; the lower end of the condensation pipe (4) is flush with the opening at the lower end of the heating evaporation chamber (1).
2. The high-efficiency evaporator for the Bayer process high-whiteness aluminum hydroxide system according to claim 1, wherein a first steam pipe (101) is arranged on one side of the heating evaporation chamber (1); the first steam pipe (101) is used for conveying steam to the heating evaporation chamber (1); a condensate pipe (102) is arranged at the bottom of the heating evaporation chamber (1); one end of the condensate pipe (102) penetrates through the vapor-liquid separation chamber (2) and is arranged outside the vapor-liquid separation chamber (2).
3. The high-efficiency evaporator for the Bayer process high-whiteness aluminum hydroxide system according to claim 1, wherein a ring of annular plates (7) are arranged between the outer edge of the open end of the heating evaporation chamber (1) and the inner wall of the vapor-liquid separation chamber (2); the ring-shaped plate (7) is provided with a plurality of demisters (701).
4. The high-efficiency evaporator for the system for preparing high-whiteness aluminum hydroxide by the Bayer process according to claim 1, wherein the upper half part of the vapor-liquid separation chamber (2) is provided with a second vapor pipe (201); a black liquor outlet pipe (202) is arranged at the lower half part of the vapor-liquid separation chamber (2); the second steam pipe (201) is located right above the demister (701).
5. The high-efficiency evaporator for the system for preparing high-whiteness aluminum hydroxide by the Bayer process according to claim 1, wherein a circulating pump (8) is installed on the circulating pipe (3); a black liquor inlet pipe (801) is also arranged on a pipeline between the circulating pump (8) and the vapor-liquid separation chamber (2).
6. A working method of a high-efficiency evaporator for a system for preparing high-whiteness aluminum hydroxide by a Bayer process is characterized by comprising the following steps:
step S1: pretreating seed precipitation mother liquor obtained by a Bayer process;
step S2: sending the seed precipitation mother liquor after pretreatment into a high-efficiency evaporator for treatment;
step S3: decomposing the slurry treated by the evaporator;
step S4: filtering and washing the decomposed slurry to obtain aluminum hydroxide;
step S5: and finishing the obtained aluminum hydroxide to obtain the high-whiteness aluminum hydroxide.
7. The operating method of the high-efficiency evaporator for the Bayer process production system of high-whiteness aluminum hydroxide according to claim 6, wherein in the step S1, the pretreatment of the seed precipitation mother liquor comprises desulfurization treatment, deferrization treatment and decolorization treatment, and the specific treatment steps are as follows:
step S11: pouring the seed precipitation mother liquor into a desulfurization reaction tank, and adding a desulfurizing agent into the tank;
step S12: the bottom flow flows into a sewage tank;
step S13: the desulfurization settling tank overflows to a deferrization reaction tank, and a deferrization agent is added into the tank;
step S14: flowing into a deferrization settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S15: the deferrization settling tank overflows to a decoloration reaction tank, and a decolorant is added into the tank;
step S16: flowing into a decoloring settling tank for reaction, and flowing the bottom flow into a sewage tank;
step S17: and the sewage tank obtains Bayer process red mud washing through a sixth storage tank.
8. The operating method of the high-efficiency evaporator for the system for preparing high-whiteness aluminum hydroxide through the Bayer process according to claim 1, wherein in the step S2, the treatment process of the high-efficiency evaporator is as follows: the red mud to be evaporated enters from a black liquor inlet pipe (801) through a circulating pump and enters a vapor-liquid separation chamber (2) through a circulating pipe (3), the red mud flows down a condensing pipe (4) by virtue of gravity, when flowing in the condensing pipe (4), the red mud is added by steam outside the pipe, evaporation is generated after the red mud reaches an evaporation temperature, the red mud and secondary steam flow down from the pipe to serve as heating steam, and the secondary steam is condensed into water after heat exchange and discharged out of the vapor-liquid separation chamber (2).
9. The operating method of the high-efficiency evaporator for the system for preparing high-whiteness aluminum hydroxide by the Bayer process according to claim 1, wherein in the step S5, the specific steps of finishing to obtain the high-whiteness aluminum hydroxide are as follows:
step S51: drying the aluminum hydroxide;
step S52: performing cyclone dust collection and cloth bag dust collection on the dried aluminum hydroxide;
step S53: filtering, recovering and packaging cyclone dust-collected powder by a micro powder sieve;
step S54: and filtering, recovering and packaging the powder collected by the cloth bag by using a centrifugal sieve.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246403.0A CN113856221A (en) | 2021-10-26 | 2021-10-26 | High-efficiency evaporator for system for preparing high-whiteness aluminum hydroxide by Bayer process and working method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111246403.0A CN113856221A (en) | 2021-10-26 | 2021-10-26 | High-efficiency evaporator for system for preparing high-whiteness aluminum hydroxide by Bayer process and working method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823307Y (en) * | 2005-04-13 | 2006-10-04 | 天津市恒脉机电科技有限公司 | Pipe type falling-film evaporator |
| CN102659153A (en) * | 2012-04-27 | 2012-09-12 | 鞠复勇 | Improvement of aluminium hydroxide production process technology |
| CN104386725A (en) * | 2014-10-10 | 2015-03-04 | 洛阳中超非金属材料有限公司 | Method for preparing high-whiteness ultrafine aluminum hydroxide from aluminum hydroxide prepared by Bayer process |
| CN104743586A (en) * | 2013-12-27 | 2015-07-01 | 中国科学院过程工程研究所 | Joint production method of alkali leaching of aluminium in Bayer red mud and aluminium oxide decomposed mother liquid evaporation for salt elimination |
-
2021
- 2021-10-26 CN CN202111246403.0A patent/CN113856221A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2823307Y (en) * | 2005-04-13 | 2006-10-04 | 天津市恒脉机电科技有限公司 | Pipe type falling-film evaporator |
| CN102659153A (en) * | 2012-04-27 | 2012-09-12 | 鞠复勇 | Improvement of aluminium hydroxide production process technology |
| CN104743586A (en) * | 2013-12-27 | 2015-07-01 | 中国科学院过程工程研究所 | Joint production method of alkali leaching of aluminium in Bayer red mud and aluminium oxide decomposed mother liquid evaporation for salt elimination |
| CN104386725A (en) * | 2014-10-10 | 2015-03-04 | 洛阳中超非金属材料有限公司 | Method for preparing high-whiteness ultrafine aluminum hydroxide from aluminum hydroxide prepared by Bayer process |
Non-Patent Citations (2)
| Title |
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| 侯鑫: "拜耳法氧化铝溶出的原理和工艺", 《科技传播》 * |
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Application publication date: 20211231 |