A comprehensive device for ultrasonic removal of organic substances from sodium aluminate solution
By integrating ultrasonic oxidation technology with other advanced oxidation technologies, the problem of low organic matter removal efficiency in sodium aluminate solution during the Bayer process was solved, achieving efficient and low-cost organic matter removal.
Patent Information
- Application Number
- CN202521825350.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-27
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-27
AI Technical Summary
Existing technologies are insufficient for efficiently removing organic matter from sodium aluminate solutions during the Bayer process. Furthermore, conventional methods are energy-intensive, costly, have a narrow range of organic matter removal, and require large amounts of reagents. Advanced oxidation technologies, even with a single unit, are difficult to adapt to complex operating conditions.
Design a comprehensive device for ultrasonic removal of organic matter from sodium aluminate solution. This device integrates ultrasonic oxidation technology with other advanced oxidation technologies, such as ozone, photocatalysis, or persulfate oxidation. Through a liquid and gas mixer, vortex channel, and photocatalytic device, a multi-stage oxidation chain reaction is achieved, thereby improving the yield of OH free radicals and mixing efficiency.
It significantly improves the efficiency of organic matter removal, reduces treatment costs, adapts to the complex operating conditions of the Bayer process, and achieves efficient and low-cost organic matter removal.
Smart Images
Figure CN224672687U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of alumina production technology, and in particular to a comprehensive device for ultrasonic removal of organic matter from sodium aluminate solution. Background Technology
[0002] my country's alumina industry ranks first in the world in scale, with an output of 73.132 million tons in 2020, accounting for 54.6% of global production. Currently, over 95% of the world's alumina is produced using the Bayer process, which involves bauxite leaching, red mud settling, and seed crystal decomposition. During this process, organic matter introduced by bauxite (contributing approximately 96%) and additives accumulates in the Bayer solution. Especially in my country, where the alumina is mainly monohydrate gibbsite, the organic matter content is as high as 0.05%-0.1%, and it tends to increase as the grade of the resource decreases during development. High concentrations of organic matter will seriously harm production, leading to reduced seed crystal decomposition rate, decreased alumina quality, altered properties of the leaching solution, increased alkali consumption, and environmental degradation.
[0003] Currently, conventional methods for removing organic matter (such as calcination, precipitation, crystallization, adsorption, ion exchange, and biological methods) generally suffer from drawbacks such as high energy consumption, high cost, severe secondary pollution, narrow range of organic matter removal, and large consumption of reagents. Advanced oxidation technologies have attracted attention due to their ability to efficiently degrade organic matter, but single technologies (such as ozone, photocatalysis, and persulfate oxidation) have bottlenecks such as slow hydroxyl radical (·OH) generation rate, low utilization efficiency, and short lifespan, making it difficult to cope with the complex organic matter system in Bayer solutions.
[0004] Among advanced oxidation technologies, ultrasonic oxidation combines the advantages of free radical oxidation, high-temperature pyrolysis, and supercritical water oxidation, offering mild reaction conditions, high degradation efficiency, wide applicability, and no secondary pollution. Studies have shown that combining ultrasound with oxidation technologies such as ozone, photocatalysis, or persulfate can significantly improve ·OH yield and utilization efficiency through synergistic effects, accelerating organic matter degradation and reducing treatment costs. However, existing devices are mostly single-function advanced oxidation designs, lacking modular integrated devices that can combine ultrasound with multiple oxides, making it difficult to adapt to the complex operating conditions and variable organic matter compositions of the Bayer process.
[0005] Therefore, there is an urgent need to develop an efficient organic matter removal device that integrates ultrasonic synergistic oxidation for improving the green production level of my country's alumina industry. Utility Model Content
[0006] The purpose of this invention is to provide a comprehensive device for ultrasonic removal of organic matter from sodium aluminate solution, so as to solve the problems mentioned in the background art.
[0007] This utility model provides the following technical solution:
[0008] An ultrasonic device for removing organic matter from sodium aluminate solution includes a sodium aluminate solution outlet, a liquid oxygen storage tank, a gaseous oxygen storage tank, and a purification reactor. The sodium aluminate solution outlet is connected to a first inlet pump via a first valve and then splits into two pathways: one pathway is connected to the inlet of a liquid mixer via a second valve, and the other pathway is connected to the inlet of a gas-liquid mixer via a third valve. The outlet of the liquid oxygen storage tank is connected to the inlet of the liquid mixer via a fourth valve, and the outlet of the gaseous oxygen storage tank is connected to the inlet of the gas-liquid mixer via a fifth valve. The outlets of the liquid mixer and the gas-liquid mixer are connected to the inlet of the purification reactor. The purification reactor includes a reaction chamber and an ultrasonic generator, which generates ultrasonic vibrations and transmits them to the solution within the reaction chamber.
[0009] In a preferred embodiment, the reaction chamber includes a reaction box, the interior of which is provided with an annular partition wall, which divides the interior of the reaction box into a non-communicating solution chamber and a light-illuminating equipment chamber. The inlet and outlet of the reactor are both connected to the solution chamber, and multiple light-illuminating devices are provided on the inner wall of the reaction box and located in the light-illuminating equipment chamber.
[0010] In a preferred embodiment, a vortex channel is provided above the annular partition wall, the bottom of the vortex channel is sealed to the top of the annular partition wall, a vortex port is provided at the center of the bottom of the vortex channel and communicates with the solution chamber, and the liquid inlet of the reactor is communicated with the vortex channel.
[0011] In a preferred embodiment, an aerator is installed at the bottom of the reaction chamber and in the solution cavity, and the air inlet of the aerator is connected to the outlet of the gaseous oxygen storage tank through an air passage.
[0012] In a preferred embodiment, the ultrasonic generating device includes an amplitude transformer, a transducer, and an ultrasonic generator. One end of the amplitude transformer is mounted on the top of the reaction chamber and connected to the transducer, while the other end extends through the reaction chamber. The transducer is connected to the ultrasonic generator.
[0013] In a preferred embodiment, a filtration device is also included, the inlet of which is connected in sequence to the outlet of the impurity removal reactor via a second inlet pump and a sixth valve, and is used to perform solid-liquid impurity removal on the solution.
[0014] In a preferred embodiment, the system further includes an exhaust gas treatment device, the inlet of which is connected to the exhaust outlet of the impurity removal reactor, for absorbing and treating the reaction tail gas.
[0015] In a preferred embodiment, the liquid oxygen storage tank is used to store liquid oxides, including sodium persulfate solution or hydrogen peroxide solution.
[0016] In a preferred embodiment, the gaseous oxygen storage tank is used to store gaseous oxides, including oxygen or ozone.
[0017] By adopting the above technical solution, this utility model has the following beneficial effects:
[0018] 1. The ultrasonic device for removing organic matter from sodium aluminate solution provided by this utility model innovatively integrates ultrasonic oxidation technology with one or more other advanced oxidation technologies. The combined oxidation technology synergistically removes organic matter from sodium aluminate solution. Through a multi-stage oxidation chain reaction, the yield of ·OH is significantly improved compared with single oxidation technology, thereby improving the removal efficiency of organic matter.
[0019] 2. The ultrasonic device for removing organic matter from sodium aluminate solution provided by this invention, through the synergistic action of a liquid mixer and / or a gas-liquid mixer, ensures thorough mixing of liquid oxides and / or gaseous oxides with the sodium aluminate solution. Compared to the problem of localized oxide failure caused by uneven mixing in traditional stirring, this provides a homogeneous and efficient reaction basis for subsequent ultrasonic synergistic oxidation. Furthermore, by setting up a vortex channel within the impurity removal reactor, its unique spiral geometry applies tangential constraint to the fluid. When the solution and liquid / gas oxides flow through this channel, the fluid is forced into a high-speed spiral motion state, allowing different phase media to achieve molecular cross-penetration within microseconds, further improving mixing efficiency. Simultaneously, the vortex channel prolongs the residence time of the solution within the channel, ultimately improving the organic matter removal efficiency. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0022] Figure 2 This is a schematic diagram of the impurity removal reactor structure of Embodiment 2 of this utility model.
[0023] Figure 3 This is a schematic diagram of the impurity removal reactor structure of Embodiment 3 of this utility model.
[0024] Figure 4 This is a three-dimensional structural diagram of the impurity removal reactor according to Embodiment 3 of this utility model.
[0025] In the attached diagram, the components are: sodium aluminate solution outlet 1, liquid oxygen storage tank 2, gaseous oxygen storage tank 3, impurity removal reactor 4, reaction chamber 41, reaction box 411, annular partition wall 412, vortex channel 413, lighting equipment 414, ultrasonic generator 42, amplitude transformer 421, transducer 422, ultrasonic generator 423, aerator 43, filtration equipment 5, waste gas treatment equipment 6, liquid mixer 7, gas-liquid mixer 8, second inlet pump 9, first inlet pump 10, first valve 11, second valve 12, third valve 13, fourth valve 14, fifth valve 15, and sixth valve 16. Detailed Implementation
[0026] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.
[0027] Example 1
[0028] See Figure 1 This embodiment discloses an ultrasonic device for removing organic matter from sodium aluminate solution, comprising a sodium aluminate solution outlet 1, a liquid oxygen storage tank 2, a gaseous oxygen storage tank 3, a purification reactor 4, a filtration device 5, and a waste gas treatment device 6. The sodium aluminate solution outlet 1 is connected to a first inlet pump 10 via a first valve 11, and then splits into two pathways: one pathway is connected to the inlet of a liquid mixer 7 via a second valve 12, and the other pathway is connected to the inlet of a gas-liquid mixer 8 via a third valve 13. The outlet of the liquid oxygen storage tank 2 is connected to the inlet of the liquid mixer 7 via a fourth valve 14, and the outlet of the gaseous oxygen storage tank 3 is connected to the inlet of the gas-liquid mixer 8 via a fifth valve 15. The purification reactor 4 includes an inlet, an outlet, and an exhaust port. The outlets of the liquid mixer 7 and the gas-liquid mixer 8 are connected and then connected to the inlet of the purification reactor 4. As mentioned above, this embodiment controls whether to add liquid oxides and / or gaseous oxides to the sodium aluminate solution for organic matter degradation via the second valve 12 or the third valve 13.
[0029] Specifically, the liquid mixer 7 can be a jet mixer, and the gas-liquid mixer 8 can be a Venturi mixer. This invention uses a jet mixer to allow the liquid oxide to directly penetrate the bulk liquid phase via jet kinetic energy, significantly shortening the mixing time between the two liquids. The Venturi mixer breaks the gaseous oxide into micro / nano-sized bubbles, significantly increasing its contact interface with the catalyst and sodium aluminate solution. In summary, both mixers improve the mass transfer efficiency and utilization rate of both the liquid and gaseous oxides.
[0030] Specifically, liquid oxygen storage tank 2 is used to store liquid oxides, including sodium persulfate solution or hydrogen peroxide solution.
[0031] Specifically, the oxygen storage tank 3 is used to store gaseous oxides, including oxygen or ozone. In other alternative embodiments, the oxygen storage tank 3 can also be a gas generating device, such as an ozone generator.
[0032] See Figure 1 and Figure 2 In this embodiment, the impurity removal reactor 4 includes a reaction chamber 41 and an ultrasonic generator 42. The reaction chamber 41 is a cylindrical reaction box 411, with an internal cavity capable of containing a sodium aluminate solution. The ultrasonic generator 42 includes an amplitude transformer 421, a transducer 422, and an ultrasonic generator 423. One end of the amplitude transformer 421 is mounted on the top of the reaction chamber 41 and connected to the transducer 422, while the other end extends into the reaction chamber 41. The transducer 422 is connected to the ultrasonic generator 423. The ultrasonic generator 423 outputs a high-frequency electrical signal, which is transmitted to the transducer 422. The transducer 422 converts the electrical signal into mechanical vibration, which is then amplified by the amplitude transformer 421 and applied to the solution in the reaction chamber 41. This results in the amplified ultrasonic waves forming a high-energy-density focused field within the reaction chamber 41, significantly improving cavitation and mass transfer efficiency, and enhancing the reaction process. Preferably, an aerator 43 is installed at the bottom of the reaction chamber 411. The air inlet of the aerator 43 is connected to the outlet of the gas oxygen storage tank 3 through an air passage. By adding a branch air passage and an aerator 43, the gaseous oxide can diffuse into the sodium aluminate solution through the aerator 43, which greatly facilitates the full contact between the gaseous oxide and the solution, making the reaction more thorough.
[0033] In this embodiment, the inlet of the filtration device 5 is connected to the outlet of the impurity removal reactor 4 via a second inlet pump 9 and a sixth valve 16. The outlet of the filtration device 5 is located below its inlet. Multiple filter plates 14 are arranged inside the filtration device 5 from top to bottom (along the water flow direction), and the filter plates can be installed in a detachable manner. After the sodium aluminate solution containing organic matter has reacted in the impurity removal reactor 4, the sixth valve 16 is opened. The sodium aluminate solution flows out from the outlet of the impurity removal reactor 4 under pressure from the second inlet pump 9 and enters the filtration device 5, where it is filtered by the multiple filter plates 14, achieving solid-liquid impurity removal and reducing large impurities in the solution.
[0034] In this embodiment, the waste gas treatment device 6 is filled with an absorbent liquid. The inlet of the waste gas treatment device 6 is connected to the outlet of the impurity removal reactor 4. The absorbent liquid can absorb and treat the reaction tail gas generated in the impurity removal reactor 4. It should be noted that there are no special limitations on the absorbent liquid in this embodiment. The absorbent liquid can be appropriately selected according to the different oxides added to the sodium aluminate solution, and can be selected according to conventional technical means in the art.
[0035] Example 2
[0036] Based on the aforementioned Example 1, the ultrasonic device for removing organic matter from sodium aluminate solution in Example 2 is further equipped with a photocatalytic oxidation synergistic function, as detailed below:
[0037] See Figures 3-4 In this embodiment, an annular partition 412 is provided inside the reaction chamber 411, dividing the interior of the reaction chamber 411 into a non-communicating solution chamber and a light-irradiation equipment chamber. The light-irradiation equipment chamber surrounds the outside of the reaction chamber circumferentially, and the inlet and outlet of the reactor 4 are both connected to the solution chamber. Multiple light-irradiation devices 414 are installed on the inner wall of the reaction chamber 411 and located within the light-irradiation equipment chamber. The multiple light-irradiation devices 414 are arranged in annular intervals along the circumference and axial direction of the reaction chamber. An aerator 43 is arranged in the solution chamber. Specifically, the light-irradiation devices can be ultraviolet lamps (such as low-pressure mercury lamps, medium-pressure mercury lamps, ultraviolet LEDs, or excimer lamps). Specifically, the annular partition 412 can be made of high-purity quartz glass to ensure high ultraviolet transmittance so that the sodium aluminate solution is irradiated with ultraviolet light, while avoiding direct contact between the light-irradiation devices 414 and the sodium aluminate solution, thus enhancing their service life. As mentioned above, this embodiment determines whether to use the photocatalytic oxidation function by controlling the activation or deactivation of the light-irradiation devices 414.
[0038] Example 3
[0039] Based on the aforementioned Example 2, Example 3 further improves the reaction chamber 41, enabling the sodium aluminate solution after oxide mixing to generate a spiral water flow when entering the impurity removal reactor 4, resulting in more thorough oxide mixing. Details are as follows:
[0040] Above the annular partition wall 412, a vortex channel 413 is also provided. Specifically, both the reaction chamber 411 and the vortex channel 413 can be made of titanium alloy or stainless steel. The bottom of the vortex channel 413 is sealed to the top of the annular partition wall 412, or installed via a flange connection. A vortex port is opened at the center of the bottom of the vortex channel 413, communicating with the solution chamber. The inlet of the reactor 4 is connected to the vortex channel 413. When the sodium aluminate solution enters from the inlet of the reactor 4, a spiral water flow effect is generated under the restrictive and guiding effect of the vortex channel 413, thereby further accelerating the mixing efficiency and reaction rate between the sodium aluminate solution and the liquid oxide or / and gaseous oxide.
[0041] As mentioned above, all valves, liquid inlet pumps, ultrasonic generators and light irradiation devices of this utility model are connected to an external controller, which controls whether they work and operate. This control technology is a conventional technology and will not be described in detail here.
[0042] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0043] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0044] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
Claims
1. A comprehensive device for ultrasonic removal of organic matter from sodium aluminate solution, characterized in that: The system includes a sodium aluminate solution outlet (1), a liquid oxygen storage tank (2), a gaseous oxygen storage tank (3), and a purification reactor (4). The sodium aluminate solution outlet (1) is connected to the first inlet pump (10) via a first valve (11) and then divided into two paths. One path is connected to the inlet of the liquid mixer (7) via a second valve (12), and the other path is connected to the inlet of the gas-liquid mixer (8) via a third valve (13). The outlet of the liquid oxygen storage tank (2) is connected to the inlet of the liquid mixer (7) via a fourth valve (14), and the outlet of the gaseous oxygen storage tank (3) is connected to the inlet of the gas-liquid mixer (8) via a fifth valve (15). The outlet of the liquid mixer (7) and the outlet of the gas-liquid mixer (8) are connected to the inlet of the purification reactor (4). The purification reactor (4) includes a reaction chamber (41) and an ultrasonic generator (42). The ultrasonic generator (42) is used to generate ultrasonic vibrations and transmit them to the solution in the reaction chamber (41).
2. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: The reaction chamber (41) includes a reaction box (411), and the interior of the reaction box (411) is provided with an annular partition (412). The annular partition (412) divides the interior of the reaction box (411) into a non-communicating solution chamber and a light-illuminating equipment chamber. The inlet and outlet of the reactor (4) are both connected to the solution chamber. Multiple light-illuminating devices (414) are provided on the inner wall of the reaction box (411) and located in the light-illuminating equipment chamber.
3. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 2, characterized in that: A vortex channel (413) is provided above the annular partition (412). The bottom of the vortex channel (413) is sealed to the top of the annular partition (412). A vortex port is provided at the center of the bottom of the vortex channel (413) and communicates with the solution chamber. The liquid inlet of the reactor (4) is communicated with the vortex channel (413).
4. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 2, characterized in that: An aerator (43) is installed at the bottom of the reaction chamber (411) and in the solution chamber. The air inlet of the aerator (43) is connected to the outlet of the oxygen storage tank (3) through an air passage.
5. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: The ultrasonic generating device (42) includes an amplitude transformer (421), a transducer (422) and an ultrasonic generator (423). One end of the amplitude transformer (421) is installed on the top of the reaction chamber (41) and connected to the transducer (422), and the other end is inserted inside the reaction chamber (41). The transducer (422) is connected to the ultrasonic generator (423).
6. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: It also includes a filtration device (5), the inlet of which is connected to the outlet of the impurity removal reactor (4) in sequence through a second inlet pump (9) and a sixth valve (16), which is used to remove impurities from the solution.
7. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: It also includes a waste gas treatment device (6), the inlet of which is connected to the exhaust port of the impurity removal reactor (4), which is used to absorb and treat the reaction tail gas.
8. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: The liquid oxygen storage tank (2) is used to store liquid oxides, including sodium persulfate solution or hydrogen peroxide solution.
9. The ultrasonic device for removing organic matter from sodium aluminate solution according to claim 1, characterized in that: The oxygen storage tank (3) is used to store gaseous oxides, including oxygen or ozone.