Boehmite morphology regulation and control device

Abstract

The utility model belongs to the field of boehmite production. In view of the problem that the cost is high when the morphology of boehmite is regulated and controlled by a hydrothermal method in the prior art, the utility model discloses a boehmite morphology regulation and control device which structurally comprises a reaction kettle, a first feed port, a second feed port and a third feed port are formed in the upper part of the reaction kettle, and a discharge port is formed in the bottom of the reaction kettle; the alkali liquor storage tank is communicated with the first feeding hole; the acid liquor storage tank is communicated with the second feeding hole; the aluminum hydroxide storage tank is communicated with the third feeding hole; the stirring assembly is used for stirring the slurry in the reaction kettle; and the heating assembly is used for heating the slurry in the reaction kettle. Compared with a hydrothermal method in the prior art, the regulation and control device does not need high-temperature reaction conditions and does not introduce irrelevant cations, so that the cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of boehmite production, and in particular relates to a boehmite morphology regulating device. Background Art

[0002] Boehmite, also known as monohydrate boehmite, is a white powder with a molecular formula of γ-AlOOH. The important application value of boehmite is to prepare alumina powder with wide industrial applications after calcination. Its outstanding advantages are that the morphology of boehmite remains unchanged before and after calcination, and alumina products with the same morphology as boehmite can be easily obtained. Second, due to the comparison of molecular structure, boehmite can be regarded as aluminum hydroxide (Al(OH) 3 ) is a product of losing a molecule of water. Therefore, starting from boehmite, preparing alumina through calcination has a significantly lower energy consumption than the method of calcining aluminum hydroxide. In summary, first preparing boehmite with different morphologies is a shortcut to finally obtaining alumina powder with corresponding morphologies. Therefore, boehmite is also called the precursor of alumina.

[0003] The hydrothermal method is a common method for preparing boehmite with different morphologies. However, in actual practice, the hydrothermal method requires a relatively high temperature (greater than 120°) to adjust the morphology of boehmite, which is costly and generally requires the addition of additives, introducing irrelevant cations. These irrelevant cationic elements cannot be converted into products and can only be discharged as waste, causing environmental pollution and increased production costs. Summary of the invention

[0004] In view of the problem that the existing hydrothermal devices have high costs when adjusting the boehmite morphology, one of the purposes of the utility model is to provide a boehmite morphology adjustment device to reduce the cost of adjusting the boehmite morphology.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A boehmite morphology control device comprises: a reactor, with a first feed port, a second feed port and a third feed port on the top and a discharge port on the bottom; an alkali solution storage tank connected to the first feed port; an acid solution storage tank connected to the second feed port; an aluminum hydroxide storage tank connected to the third feed port; a stirring component for stirring the slurry in the reactor; and a heating component for heating the slurry in the reactor.

[0007] In one of the technical solutions disclosed in the present utility model, the stirring assembly includes: a stirring shaft, rotatably arranged on the central axis of the reactor; a stirring blade, arranged on the stirring shaft; and a driving structure, which is transmission-connected to the stirring shaft to drive the stirring shaft to rotate.

[0008] In one of the technical solutions disclosed in the present utility model, the stirring blades are arranged in multiple layers at different heights of the stirring shaft, and the stirring blades of two adjacent layers are arranged alternately.

[0009] In one of the technical solutions disclosed in the utility model, the reactor is double-layered; the inner layer and the outer layer of the reactor form a hollow heating chamber;

[0010] The heating component is used to increase the heating medium and is communicated with the heating chamber.

[0011] In one of the technical solutions disclosed in the utility model, an inlet is provided at the bottom of the outer layer of the reactor, and an outlet is provided at the top; the inlet is connected to the heating component.

[0012] In one of the technical solutions disclosed in the utility model, a pH detector is also included; the pH detector is used to detect the pH of the slurry in the reactor.

[0013] In one of the technical solutions disclosed in the utility model, the detection head of the pH detector is inserted into the bottom of the inner cavity of the reactor.

[0014] In one of the technical solutions disclosed in the utility model, a temperature sensor is also included; the temperature sensor is used to detect the temperature of the slurry in the reactor.

[0015] In one of the technical solutions disclosed in the present utility model, the temperature sensor is a waterproof and corrosion-resistant sensor, and is arranged in the middle of the inner cavity of the reactor.

[0016] It can be seen from the above description that the beneficial effect of the utility model is: first, aluminum hydroxide is added to the reactor through the third feed port, then, at a temperature of 60°C, acid and alkali are added to the reactor in sequence, and the mixture is evenly mixed by a stirring assembly, wherein the amount of alkali in the alkali storage tank can raise the pH value of the slurry to 10-12, and the amount of acid in the acid storage tank can reduce the pH value of the slurry to 2-4, repeat the above operation multiple times, and achieve the morphology control of boehmite through pH swing to obtain suitable boehmite. Compared with the hydrothermal method of the prior art, high temperature reaction conditions are not required, and irrelevant cations will not be introduced, which is conducive to reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a schematic diagram of the longitudinal section structure of the utility model.

[0020] Figure 3 It is another schematic diagram of the longitudinal section structure of the utility model.

[0021] Figure numerals: 1-reactor; 11-first feed inlet; 12-second feed inlet; 13-third feed inlet; 14-discharge port; 15-heating chamber; 16-inlet; 17-outlet; 2-alkali solution storage tank; 3-acid solution storage tank; 4-aluminum hydroxide storage tank; 5-stirring assembly; 51-stirring shaft; 52-stirring blade; 53-driving structure; 6-PH detector; 7-temperature sensor. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0025] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0027] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0028] The utility model discloses a boehmite morphology adjustment device, the structure of which is as shown in the attached figure. Figure 1 ~Attached Figure 3 As shown, it includes a reaction kettle 1, an alkali solution storage tank 2, an acid solution storage tank 3, an aluminum hydroxide storage tank 4, a stirring component 5 and a heating component (not shown in the drawings).

[0029] Specifically, the top of the reactor 1 is provided with a first feed port 11, a second feed port 12 and a third feed port 13, which are respectively connected to the alkali solution storage tank 2, the acid solution storage tank 3 and the aluminum hydroxide storage tank 4, and the bottom is provided with a discharge port 14. The stirring component 5 is at least partially disposed in the reactor 1 to stir the slurry in the reactor 1 to make it uniformly mixed. The heating component is used to heat the slurry in the reactor 1.

[0030] Exemplarily, the alkali solution is sodium hydroxide and the acid solution is hydrochloric acid.

[0031] In practical applications, the slurry in the reactor 1 is heated by a heating component, and at a temperature of 60°C, acid and alkali are added to the slurry containing aluminum hydroxide in sequence, and the mixture is evenly mixed by a stirring component 5, wherein the amount of alkali in the alkali storage tank 2 can raise the pH value of the slurry to 10-12, and the amount of acid in the acid storage tank 3 can reduce the pH value of the slurry to 2-4, and the above operations are repeated multiple times to achieve morphology control of boehmite through pH swing to obtain suitable boehmite. Compared with the hydrothermal method of the prior art, high temperature reaction conditions are not required, and irrelevant cations will not be introduced, which is conducive to reducing costs.

[0032] In some embodiments, the stirring assembly 5 includes a stirring shaft 51, stirring blades 52 and a driving structure 53. The stirring shaft 51 is rotatably arranged on the central axis of the reactor 1; the stirring blades 52 are arranged in multiple layers at different heights of the stirring shaft 52, and the stirring blades 52 of two adjacent layers are staggered. Thus, materials at different depths are fully and evenly stirred, the stirring blind area is reduced, and the stirring efficiency is greatly improved, so that the acid solution, the alkali solution and the slurry are mixed evenly. Exemplarily, the driving structure 53 is a motor.

[0033] In some embodiments, the reactor 1 is double-layered, and a hollow heating chamber 15 is formed between the outer layer and the inner layer. The heating component is used to provide a heating medium and is connected to the heating chamber 15. Exemplarily, the heating medium is steam or water.

[0034] In the above embodiment, the lower part of the outer layer of the reactor 1 is provided with an inlet 16 communicating with the heating chamber 15, and the upper part of the outer layer is provided with an outlet 17 communicating with the heating chamber 15. The inlet 16 is connected to the heating assembly. The heating medium enters the heating chamber 15 from the inlet 16 and is discharged through the outlet 17. The above-mentioned bottom-in and top-out method can increase the residence time of the heating medium in the heating chamber 15, thereby facilitating the improvement of the heating effect.

[0035] In some embodiments, a pH detector 6 is further included to detect the pH value of the slurry. The detection end of the pH detector 6 is inserted into the inner cavity of the reactor 1 and extends to the bottom of the reactor 1 to improve the accuracy of the detection.

[0036] In some embodiments, a temperature sensor 7 is further included, which is disposed in the inner cavity of the reactor 1 to detect the temperature of the slurry to prevent the slurry from being too high in temperature. Exemplarily, the temperature sensor 7 is disposed in the middle of the inner cavity of the reactor 1. It is understood that the temperature sensor 7 is a commercially available waterproof and corrosion-resistant temperature sensor.

[0037] From the above description, it can be seen that the working principle and beneficial effects of the utility model are:

[0038] First, aluminum hydroxide is added to the reactor 1 through the third feed port 13, and then, at a temperature of 60°C, acid and alkali are added to the reactor 1 in sequence, and the mixture is evenly mixed by the stirring assembly 5, wherein the amount of alkali in the alkali storage tank 2 can raise the pH value of the slurry to 10-12, and the amount of acid in the acid storage tank 3 can reduce the pH value of the slurry to 2-4, and the above operations are repeated multiple times to achieve morphology control of boehmite through pH swing to obtain suitable boehmite. Compared with the hydrothermal method of the prior art, high temperature reaction conditions are not required, and irrelevant cations will not be introduced, which is conducive to reducing costs.

[0039] The specific implementation methods described above further illustrate the purpose, technical solutions and beneficial effects of the utility model in detail. It should be understood that the above description is only the specific implementation method of the utility model and is not used to limit the protection scope of the utility model. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A boehmite morphology control device, characterized in that: include: A reactor having a first feed inlet, a second feed inlet and a third feed inlet at the top and a discharge port at the bottom; an alkali solution storage tank, connected to the first feed inlet; an acid liquid storage tank, connected to the second feed port; an aluminum hydroxide storage tank, connected to the third feed port; A stirring assembly, used for stirring the slurry in the reaction kettle; The heating component is used for heating the slurry in the reaction kettle.

2. The boehmite morphology control device according to claim 1, characterized in that: The stirring assembly comprises: A stirring shaft, rotatably arranged on the central axis of the reactor; A stirring blade is arranged on the stirring shaft; The driving structure is connected to the stirring shaft to drive the stirring shaft to rotate.

3. The boehmite morphology control device according to claim 2, characterized in that: The stirring blades are arranged in multiple layers at different heights of the stirring shaft, and the stirring blades of two adjacent layers are arranged alternately.

4. The boehmite morphology control device according to claim 1, characterized in that: The reactor is double-layered; the inner layer and the outer layer of the reactor form a hollow heating chamber; The heating component is used to increase the heating medium and is communicated with the heating chamber.

5. The boehmite morphology control device according to claim 4, characterized in that: An inlet is arranged at the bottom of the outer layer of the reactor, and an outlet is arranged at the top; the inlet is communicated with the heating component.

6. The boehmite morphology control device according to claim 1, characterized in that: It also includes a pH detector; the pH detector is used to detect the pH of the slurry in the reactor.

7. The boehmite morphology control device according to claim 6, characterized in that: The detection head of the pH detector is inserted into the bottom of the inner cavity of the reactor.

8. The boehmite morphology control device according to claim 1 or 6, characterized in that: It also includes a temperature sensor; the temperature sensor is used to detect the temperature of the slurry in the reaction kettle.

9. The boehmite morphology control device according to claim 8, characterized in that: The temperature sensor is a waterproof and corrosion-resistant sensor and is arranged in the middle of the inner cavity of the reactor.

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