Acid preparation device and pickling processing system

Abstract

The utility model discloses an acid preparation device and an acid pickling processing system. The acid preparation device comprises a first accommodating part, a second accommodating part, an overflow tank and an acid storage tank, wherein the first accommodating part is used for storing an oxalic acid raw material; the second accommodating piece is used for storing hydrofluoric acid stock solution; the overflow tank is communicated with a feeding pipeline, a first liquid conveying pipeline and a first circulating pipeline, the first circulating pipeline is used for inputting raw acid liquid into the overflow tank, the feeding pipeline is communicated with the first accommodating part and is used for adding an oxalic acid raw material into the overflow tank, and the first liquid conveying pipeline is communicated with the acid storage tank and is used for inputting oxalic acid liquid into the acid storage tank; the second containing part is communicated with a second liquid conveying pipeline, and the second liquid conveying pipeline is communicated with the acid storage tank and used for conveying hydrofluoric acid stock solution into the acid storage tank; the acid storage tank is communicated with a second circulating pipeline which can receive the oxalic acid liquor and the hydrofluoric acid stock solution and mix the oxalic acid liquor and the hydrofluoric acid stock solution to form new acid liquor, and the second circulating pipeline is used for outputting the new acid liquor. The acid preparation device can realize automation and sealing of the whole acid preparation process.

Description

Technical Field

[0001] This utility model relates to the field of ultra-white quartz sand manufacturing technology, and in particular to an acid mixing device and an acid washing processing system. Background Technology

[0002] With the rapid development of the photovoltaic industry in recent years, the demand for ultra-white quartz sand has increased significantly. One related technology involves acid washing to further reduce the iron content of quartz sand, thereby achieving the quality standards for ultra-white sand.

[0003] Pickling often uses a mixed acid solution of hydrofluoric acid and oxalic acid. During the pickling of quartz sand, the concentration of each acid decreases due to the reaction with the metal oxides, and some of the acid solution is also lost. Therefore, after a period of use, the acid solution needs to be recovered by adding water and new acid to restore the concentration for reuse.

[0004] However, hydrofluoric acid is highly corrosive and volatile, posing significant safety risks to operators during the acid preparation process. Utility Model Content

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an acid preparation device that can automate and enclose the entire acid preparation process, greatly improving the efficiency of acid preparation and reducing the possibility of safety accidents.

[0006] This utility model also proposes an acid pickling system having the above-mentioned acid mixing device.

[0007] An acid mixing apparatus according to a first aspect embodiment of the present invention includes a first accommodating element, a second accommodating element, an overflow tank, and an acid storage tank:

[0008] The first container is used to store oxalic acid raw material; the second container is used to store hydrofluoric acid stock solution;

[0009] The overflow tank is connected to an inlet pipe, a first liquid delivery pipe, and a first circulation pipe. The first circulation pipe is used to input raw acid solution into the overflow tank. The inlet pipe is connected to the first container and is used to add the oxalic acid raw material into the overflow tank. The first liquid delivery pipe is connected to the acid storage tank and is used to input oxalic acid solution into the acid storage tank.

[0010] The second container is connected to a second infusion pipe, which is connected to the acid storage tank for introducing the hydrofluoric acid stock solution into the acid storage tank.

[0011] The acid storage tank is connected to a second circulation pipe. The acid storage tank is configured to receive the oxalic acid solution and the hydrofluoric acid stock solution and mix them to form a new acid solution. The second circulation pipe is used to output the new acid solution.

[0012] The acid mixing apparatus according to the embodiments of this utility model has at least the following beneficial effects:

[0013] This application presents an acid preparation device that automates and encloses the entire acid preparation process, replacing manual acid preparation, significantly improving efficiency, saving labor costs, and reducing the likelihood of safety accidents. Furthermore, the completely sealed storage and addition of hydrofluoric acid reduces the safety risks of personnel contact and prevents acid gas escape from harming equipment and the environment.

[0014] According to some embodiments of the present invention, the first circulation pipe is connected to the bottom of the overflow tank.

[0015] According to some embodiments of the present invention, the connection point between the first infusion pipeline and the overflow tank is higher than the connection point between the first circulation pipeline and the overflow tank.

[0016] According to some embodiments of the present invention, the second infusion pipeline is connected to the first infusion pipeline, and the hydrofluoric acid stock solution is sequentially input into the acid storage tank via the second infusion pipeline and the first infusion pipeline.

[0017] According to some embodiments of the present invention, the acid mixing device further includes a stirring mechanism, which includes a driving component installed outside the overflow tank and a stirring component extending into the overflow tank. Driven by the driving component, the stirring component rotates to dissolve the oxalic acid raw material.

[0018] According to some embodiments of the present invention, the acid mixing device further includes a vibrating feeder, the feed end of which is connected to the first accommodating member, and the discharge end of which is connected to the overflow tank, and the oxalic acid raw material is fed into the overflow tank via the vibrating feeder.

[0019] According to some embodiments of the present invention, the first accommodating member defines a first accommodating cavity for accommodating the oxalic acid raw material. The first accommodating cavity gradually narrows from top to bottom, and the bottom end of the first accommodating cavity is provided with an opening for outputting the oxalic acid raw material.

[0020] According to some embodiments of the present invention, the acid storage tank is connected to a liquid level controller, the second circulation pipeline is connected to an acid adding pump, and the liquid level controller is communicatively connected to the acid adding pump.

[0021] According to some embodiments of the present invention, the second infusion pipeline is connected to a metering pump, the acid mixing device includes a controller, and the metering pump is communicatively connected to the controller.

[0022] The pickling system according to a second aspect embodiment of the present invention includes:

[0023] The processing device includes an output pipe and an input pipe;

[0024] As described in any of the above embodiments, the acid mixing device has the first circulation pipe connected to the output pipe and the second circulation pipe connected to the input pipe.

[0025] The pickling system according to the embodiments of the present invention has at least the following beneficial effects:

[0026] The acid mixing unit can recover some of the lower concentration acid from the processing unit in real time, and at the same time replenish the higher concentration acid to the processing unit, so that the overall acid concentration in the processing unit remains in a relatively uniform and stable state.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0029] Figure 1 This is a schematic diagram of the acid mixing device according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the overflow tank according to an embodiment of the present utility model;

[0031] Figure 3 This is a schematic diagram of the structure of the second accommodating member according to an embodiment of the present utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the acid storage tank according to an embodiment of the present utility model;

[0033] Figure 5 This is a schematic diagram of the first accommodating component and the vibrating feeder in an embodiment of the present utility model.

[0034] Figure label:

[0035] First receiving component 100;

[0036] Second receiving component 200; Second infusion pipeline 210; Metering pump 211;

[0037] Overflow tank 300; feed pipe 310; first infusion pipe 320; first circulation pipe 330;

[0038] Acid storage tank 400; Second circulation pipeline 410; Acid adding pump 411; Liquid level sensor 420;

[0039] Stirring mechanism 500; drive component 510; stirring component 520;

[0040] Vibrating feeder 600; Detailed Implementation

[0041] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0042] 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.

[0043] 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. The use of "first" and "second" in the description is merely for 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.

[0044] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0045] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0046] With the rapid development of the photovoltaic industry in recent years, the demand for ultra-white quartz sand has increased significantly. Among related technologies, acid washing is used to further reduce the iron content of quartz sand to achieve the quality standard of ultra-white sand. The core technologies of quartz sand acid washing include feeding, acid preparation, heating, and acid discharge. The main factors affecting the acid washing results include: feed amount, acid concentration, reaction time, reaction temperature, and catalyst. How to improve reaction efficiency, increase output, and reduce costs by controlling relevant reaction conditions during production is a key issue that the industry urgently needs to address.

[0047] Pickling often uses a mixture of hydrofluoric acid and oxalic acid. Hydrofluoric acid has strong corrosive power and can react chemically with silica, thus corroding the surface of quartz sand grains and the silica-containing materials filling the gaps, exposing the iron-containing substances in the sand grains to the acid environment. The iron-containing substances in the sand grains react chemically with the acid to form iron ions, which enter the acid solution. Oxalate ions then react with the iron ions to form ferric oxalate complexes, which dissolve in the acid solution. The acid solution is then separated from the silica sand through solid-liquid separation, thereby reducing the iron content in the silica sand.

[0048] During the pickling process of quartz sand, the concentration of each acid decreases due to the reaction with the metal oxides, and some acid is also lost. To save production costs and improve production efficiency, the acid solution needs to be recycled by adding water and new acid to restore the concentration after a period of use before it can be reused. Therefore, the speed, uniformity, and stability of acid solution preparation will affect the iron removal effect, product quality, and yield.

[0049] However, hydrofluoric acid is highly corrosive and volatile, posing significant safety risks to operators during the acid preparation process. Furthermore, manual acid preparation is often inefficient, failing to meet demand in a timely manner when large quantities of acid are needed, leading to production stoppages.

[0050] To solve the above problems, such as Figures 1 to 5 As shown, the first aspect of this application proposes an acid mixing device, which includes a first container 100, a second container 200, an overflow tank 300, and an acid storage tank 400. The first container 100 is used to store oxalic acid raw material. It should be explained that the oxalic acid raw material is not liquid, but a solid powder. Therefore, the second container 200 can be a closed container or an open container. The second container 200 is used to store hydrofluoric acid stock solution. It is understood that the hydrofluoric acid stock solution has a high concentration and strong corrosiveness and volatility. Therefore, the second container 200 needs to be a closed container.

[0051] The overflow tank 300 is connected to an inlet pipe 310, a first liquid delivery pipe 320, and a first circulation pipe 330. The first circulation pipe 330 is used to input raw acid solution into the overflow tank 300. It should be explained that raw acid solution refers to acid solution that has been used for a period of time and whose acidity is lower than required. One end of the inlet pipe 310 is connected to the overflow tank 300, and the other end is connected to the first container 100. It is used to add oxalic acid raw material into the overflow tank 300. The oxalic acid raw material dissolves in the raw acid solution in the overflow tank 300. It can be understood that by controlling the amount of oxalic acid raw material added, the concentration of the acid solution in the overflow tank 300 can be controlled to ensure that the oxalic acid concentration in the acid solution meets the requirements. For ease of subsequent description, the acid solution in the overflow tank 300 that has dissolved oxalic acid and meets the oxalic acid requirements is named oxalic acid solution. One end of the first infusion pipeline 320 is connected to the overflow tank 300, and the other end is connected to the acid storage tank 400, for inputting oxalic acid solution into the acid storage tank 400.

[0052] The second container 200 is connected to a second infusion pipe 210, which is connected to an acid storage tank 400 for introducing hydrofluoric acid stock solution into the acid storage tank 400. Thus, the hydrofluoric acid stock solution and oxalic acid solution can mix in the acid storage tank 400 to form a new acid solution. It is understood that the concentration of hydrofluoric acid in the new acid solution can be adjusted according to the amount of hydrofluoric acid stock solution input to ensure that the concentration of hydrofluoric acid in the new acid solution meets the processing requirements.

[0053] The acid storage tank 400 is also connected to a second circulation pipe 410, which is used to output new acid solution. The second circulation pipe 410 can be connected to the input pipe of the processing device, thereby replenishing the processing device with acid solution of appropriate concentration to ensure the normal operation of the pickling process. The stability of the acid solution concentration is beneficial to improving the quality of pickling and obtaining high-quality ultra-white quartz sand.

[0054] Based on the above, this application designs an acid preparation device that automates and encloses the entire acid preparation process, thereby replacing manual acid preparation, greatly improving the efficiency of acid preparation, saving labor costs, and reducing the possibility of safety accidents. Furthermore, because the storage and addition of hydrofluoric acid are completely sealed, the safety risks of personnel contact are reduced, and the escape of acid gas from the device and the environment is prevented from causing harm.

[0055] In some embodiments, such as Figure 2As shown, the first circulation pipe 330 is connected to the bottom of the overflow tank 300. Based on the aforementioned, since the oxalic acid raw material is a solid powder, it may not dissolve in time after being added to the overflow tank 300, thus depositing at the bottom of the overflow tank 300. Because the first circulation pipe 330 feeds the original acid solution into the overflow tank 300, the precipitated oxalic acid raw material will not only not clog the first circulation pipe 330, but the presence of liquid input in the first circulation pipe 330 will also disturb the deposits at the bottom of the overflow tank 300, allowing them to fully contact the acid solution in the overflow tank 300, thereby accelerating its dissolution rate.

[0056] Additionally, it should be noted that in some embodiments, the raw acid solution input from the first circulation pipe 330 to the overflow tank 300 originates directly from the processing unit, thus retaining a certain residual heat. When added to the acid storage tank 400, the residual heat of the acid solution can accelerate the dissolution of the oxalic acid raw material.

[0057] In some embodiments, the connection point between the first infusion pipe 320 and the overflow tank 300 is higher than the connection point between the first circulation pipe 330 and the overflow tank 300. This reduces the probability that the original acid solution in the overflow tank 300 will directly exit through the first infusion pipe 320 after entering the overflow tank 300. This ensures that the original acid solution entering through the first circulation pipe 330 is fully mixed in the overflow tank 300 before being exited, thereby guaranteeing that the concentration of the acid solution exiting the overflow tank 300 meets the requirements. Furthermore, because the first infusion pipe 320 is positioned higher, it prevents sediment at the bottom of the overflow tank 300 from clogging the inlet of the first infusion pipe 320.

[0058] In some embodiments, the second infusion conduit 210 is directly connected to the acid storage tank 400 (not shown in the figure), and the hydrofluoric acid stock solution begins to mix with the oxalic acid solution in the acid storage tank 400. In other embodiments, such as Figure 1 As shown, the second infusion pipe 210 is directly connected to the first infusion pipe 320, so that the hydrofluoric acid stock solution is sequentially fed into the acid storage tank 400 via the second infusion pipe 210 and the first infusion pipe 320. Thus, the hydrofluoric acid stock solution can begin to mix with the oxalic acid solution in the first infusion pipe 320. As the acid solution flows in the first infusion pipe 320, the two acids are uniformly mixed during the flow process, resulting in high mixing efficiency and stable acid composition.

[0059] In some embodiments, the acid mixing device further includes a stirring mechanism 500, which includes a drive member 510 and a stirring member 520. The drive member 510 is mounted outside the overflow tank 300, such as... Figure 2As shown, the drive unit 510 is mounted on the top cover of the overflow tank 300. The agitator 520 is connected to the output shaft of the drive unit 510 and extends into the overflow tank 300. The blades at the end of the agitator 520 are immersed in the acid solution. Driven by the drive unit 510, the agitator 520 rotates to accelerate the flow of the acid solution, thereby promoting the dissolution of the oxalic acid raw material.

[0060] In some embodiments, such as Figure 1 and Figure 5 As shown, the acid mixing device also includes a vibrating feeder 600. The feed end of the vibrating feeder 600 is connected to the first container 100, and the discharge end is connected to the overflow tank 300. Oxalic acid raw material is fed into the overflow tank 300 via the vibrating feeder 600. The vibrating feeder 600 can transport powdered oxalic acid raw material from the first container 100 to the overflow tank 300 in a timely, quantitative, and uniform manner, avoiding equipment blockage or efficiency reduction caused by material accumulation or intermittent operation.

[0061] In some embodiments, the first receiving member 100 defines a first receiving cavity, which gradually narrows from top to bottom. The top of the first receiving cavity is wider, suitable for adding oxalic acid raw material into the first receiving cavity, and the bottom of the first receiving cavity is narrower, suitable for controlling the output of oxalic acid raw material. Figure 5 As shown, the bottom end of the first accommodating cavity is provided with an opening for the output of oxalic acid raw material, which is aligned with the feed end of the vibrating feeder 600.

[0062] In some embodiments, such as Figure 4 As shown, the acid storage tank 400 is connected to a level controller, the second circulation pipe 410 is connected to an acid pump 411, and the level sensor 420 is communicatively connected to the acid pump 411. When the level detected by the level sensor 420 reaches a set value, the acid pump 411 is controlled to extract acid from the acid storage tank 400 and output it through the second circulation pipe 410. It should be noted that the level sensor 420 can be a contact type, such as a float-type level sensor 420, or a non-contact type, such as an infrared level sensor 420. Depending on the detection principle, the level sensor 420 can be installed inside or outside the acid storage tank 400. In addition, the acid mixing device also includes a controller. The acid pump 411 and the level sensor 420 are respectively connected to the controller. Thus, the level sensor 420 can provide the controller with the current acid level. The controller collects the acid concentration and content in the processing device and integrates the acid concentration and content in the acid storage tank 400 to control the acid pump 411 to replenish the acid in the processing device in a timely and dynamic manner.

[0063] In some embodiments, such as Figure 3As shown, the second infusion pipeline 210 is connected to a metering pump 211. The metering pump 211 provides a power source for the output of hydrofluoric acid stock solution, and it can precisely control the output of hydrofluoric acid stock solution to achieve precise acid adjustment. The metering pump 211 can also communicate with a controller, thereby being controlled by the controller to replenish the hydrofluoric acid stock solution.

[0064] The second aspect of this application also proposes an acid pickling system, which includes a processing device and an acid mixing device. The processing device is used for acid pickling quartz stone. The processing device includes an output pipe and an input pipe. The output pipe is connected to a first circulation pipe 330 of the acid mixing device, and the input pipe is connected to a second circulation pipe 410. Thus, the acid mixing device can recover a portion of the lower-concentration acid solution from the processing device in real time, while simultaneously replenishing the processing device with a higher-concentration acid solution, thereby maintaining a relatively uniform and stable acid concentration in the processing device. This stabilizes the iron removal capacity of the acid solution, improves acid mixing efficiency, reduces safety risks, stabilizes product quality and yield, and reduces costs.

[0065] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. Acid dispensing device, characterized in that The acid preparation device comprises a first accommodating part, a second accommodating part, an overflow tank and an acid storage tank. The first accommodating part is used for storing oxalic acid raw materials; the second accommodating part is used for storing hydrofluoric acid stock solution. The overflow tank is communicated with a feeding pipeline, a first liquid conveying pipeline and a first circulating pipeline; the first circulating pipeline is used for inputting raw acid solution into the overflow tank; the feeding pipeline is communicated with the first accommodating part and used for adding the oxalic acid raw materials into the overflow tank; the first liquid conveying pipeline is communicated with the acid storage tank and used for inputting oxalic acid solution into the acid storage tank. The second accommodating part is communicated with a second liquid conveying pipeline; the second liquid conveying pipeline is communicated with the acid storage tank and used for inputting the hydrofluoric acid stock solution into the acid storage tank. The acid storage tank is communicated with a second circulating pipeline; the acid storage tank is configured to receive the oxalic acid solution and the hydrofluoric acid stock solution and mix them to form new acid solution; the second circulating pipeline is used for outputting the new acid solution.

2. The acid dispensing device of claim 1, wherein The first circulating pipeline is communicated with the bottom of the overflow tank.

3. The acid dispensing device of claim 1, wherein The communication position of the first liquid conveying pipeline with the overflow tank is higher than the communication position of the first circulating pipeline with the overflow tank.

4. The acid dispensing device of claim 1, wherein The second liquid conveying pipeline is communicated with the first liquid conveying pipeline; the hydrofluoric acid stock solution is sequentially input into the acid storage tank through the second liquid conveying pipeline and the first liquid conveying pipeline.

5. The acid dispensing device of claim 1, wherein The acid preparation device further comprises a stirring mechanism; the stirring mechanism comprises a driving member installed outside the overflow tank and a stirring member extending into the overflow tank; the stirring member is driven by the driving member to rotate to promote the dissolution of the oxalic acid raw materials.

6. The acid dispensing device of claim 1, wherein The acid preparation device further comprises a vibrating feeder; the feeding end of the vibrating feeder is connected with the first accommodating part; the discharging end is communicated with the overflow tank; the oxalic acid raw materials are input into the overflow tank through the vibrating feeder.

7. The acid dispensing device of claim 1, wherein The first accommodating part defines a first accommodating cavity for accommodating the oxalic acid raw materials; the first accommodating cavity is gradually narrowed in the direction from top to bottom; the bottom end of the first accommodating cavity is provided with an opening for outputting the oxalic acid raw materials.

8. The acid dispensing device of claim 1, wherein The acid storage tank is connected with a liquid level controller; the second circulating pipeline is connected with an acid adding pump; the liquid level controller is communicatively connected with the acid adding pump.

9. The acid dispensing device of claim 1, wherein, The second liquid conveying pipeline is connected with a metering pump; the acid preparation device comprises a controller; the metering pump is communicatively connected with the controller.

10. A pickling system characterized by, The acid preparation device comprises: a processing device comprising an output pipeline and an input pipeline; the acid preparation device according to any one of claims 1 to 9; the first circulating pipeline is communicated with the output pipeline; the second circulating pipeline is communicated with the input pipeline.

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