Production line of titanium dioxide coating process

Abstract

The utility model discloses a production line of a titanium dioxide coating process, relates to the technical field of titanium dioxide preparation, and solves the problem that a low-grade aluminum hydroxide coating production line which is lower in cost on the basis of an existing coating process needs to be designed in the prior art. The device comprises a sodium metaaluminate preparation production line and a titanium dioxide coating production line communicated with the sodium metaaluminate preparation production line through a pipeline, wherein a first impurity removal tank for removing impurities from sodium metaaluminate is connected between the sodium metaaluminate preparation production line and the titanium dioxide coating production line through a pipeline; the utility model aims to further reduce the production cost on the basis of ensuring the coating quality of titanium dioxide on the basis of preparing low-grade sodium metaaluminate from low-grade aluminum hydroxide and low-grade aluminum sulfate.

Description

Technical Field

[0001] This utility model belongs to the field of titanium dioxide preparation technology, specifically relating to a production line for titanium dioxide coating process. Background Technology

[0002] Our company uses the sulfuric acid process to produce titanium dioxide. In the post-processing section, also known as the coating section, titanium dioxide particles undergo inorganic treatment to improve their weather resistance, durability, and chemical stability. This compensates for the photochemical activity of titanium dioxide particles and enhances their wetting, dispersion, and rheological properties in various media, allowing titanium dioxide to be better and more uniformly dispersed in different media. Currently, most commercially available rutile titanium dioxide is coated with aluminum or silicon, with aluminum coating being the most common. In addition to forming a protective layer on the surface of titanium dioxide to prevent contact between titanium dioxide and organic media, aluminum coating can also reflect some ultraviolet light, preventing excessive absorption of ultraviolet light and photochemical reactions.

[0003] However, the overall cost of using high-grade aluminum hydroxide for titanium dioxide coating is currently high. The company is considering using low-grade aluminum sulfate (containing impurities including iron, magnesium, silicon, calcium, sodium, potassium, etc.) and low-grade sodium hydroxide (iron ions, silicon oxide, calcium oxide) to prepare sodium aluminate. After removing impurities, the company can then use it for titanium dioxide coating to reduce the production cost of directly purchasing high-grade sodium hydroxide and sodium sulfate. However, the company does not have a production line for coating using low-grade sodium hydroxide. Therefore, the company needs to design a low-grade aluminum hydroxide coating production line that can reduce costs compared to the existing coating process. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a production line for titanium dioxide coating process. It employs a sodium aluminate preparation line to prepare low-grade aluminum sulfate. The low-grade aluminum sulfate undergoes preliminary impurity removal to remove solid, suspended, and colloidal impurities. Then, the low-grade aluminum sulfate reacts with low-grade sodium hydroxide to produce sodium aluminate. By adjusting the pH and controlling a series of reaction conditions, iron impurities in the sodium aluminate are precipitated and removed through a first impurity removal tank. Finally, the solution is fed into the titanium dioxide coating production line for coating. By utilizing low-grade aluminum hydroxide and low-grade aluminum sulfate to prepare low-grade sodium aluminate, this method can further reduce production costs while ensuring the quality of titanium dioxide coating.

[0005] The technical solution adopted in this utility model is as follows:

[0006] A production line for titanium dioxide coating process includes a sodium aluminate preparation production line and a titanium dioxide coating production line connected to it via a pipeline. The sodium aluminate preparation production line and the titanium dioxide coating production line are connected by a pipeline to a first impurity removal tank for removing impurities from the sodium aluminate.

[0007] Using the above technical solution, a sodium aluminate preparation production line is used to prepare low-grade aluminum sulfate. The low-grade aluminum sulfate undergoes preliminary impurity removal to remove solid, suspended, and colloidal impurities. Then, the low-grade aluminum sulfate reacts with low-grade sodium hydroxide to produce sodium aluminate. By adjusting the pH and controlling a series of reaction conditions, iron impurities in the sodium aluminate are precipitated and removed through a first impurity removal tank. After that, it is fed into a titanium dioxide coating production line for coating. By using low-grade aluminum hydroxide and low-grade aluminum sulfate to prepare low-grade sodium aluminate, the production cost can be further reduced while ensuring the quality of titanium dioxide coating.

[0008] Preferably, the sodium aluminate preparation production line includes a first preparation tank, the outlet of the first preparation tank is connected to a first filter press via a pipeline, the outlet of the first filter press is connected to the inlet of a second preparation tank via a pipeline, and the outlet of the second preparation tank is connected to the inlet of a first impurity removal tank via a pipeline.

[0009] Using the above technical solution, a low-grade aluminum sulfate solution is prepared in the first preparation tank. A first filter press removes solid, suspended matter, and colloidal impurities from the low-grade aluminum sulfate solution. Then, the purified aluminum sulfate solution is passed into the second preparation tank and further reacted with low-grade sodium hydroxide to prepare low-grade sodium aluminate. The low-grade sodium aluminate solution is then passed into the first impurity removal tank for impurity removal. The impurity removal step involves adding sodium hydroxide to increase the pH value of the solution, causing iron ions to form an insoluble precipitate of iron hydroxide, which is then removed by filtration.

[0010] Preferably, the titanium dioxide coating production line includes a second filter press and a coating tank. The outlet of the first impurity removal tank is connected to the inlet of the second filter press via a pipeline, and the outlet of the second filter press is connected to the inlet of the coating tank via a pipeline.

[0011] Using the above technical solution, the second filter press is used to remove solids, suspended matter and colloidal impurities from the sodium aluminate solution flowing out of the first impurity removal tank. After the impurities are removed, the iron content in the sodium aluminate solution is greatly reduced, meeting the titanium dioxide coating standard, and then it is passed into the coating tank for coating.

[0012] Preferably, the first preparation tank is further provided with an exhaust gas outlet, the exhaust gas outlet is connected to the air inlet of the exhaust gas spray tower through a pipeline, and the air outlet of the exhaust gas spray tower is connected to the air inlet of the exhaust gas fan through a pipeline.

[0013] Using the above technical solution, when aluminum sulfate is prepared in the first preparation tank, a large amount of tail gas will be generated. The tail gas is fed into the tail gas spray tower for spraying and then discharged through the outlet of the spray tower and the tail gas fan.

[0014] Preferably, a first thermometer is provided on the first impurity removal tank.

[0015] Using the above technical solution, the first thermometer is used to monitor the temperature in real time during the removal of impurities from low-grade sodium aluminate.

[0016] Preferably, a first pH meter is provided on the first impurity removal tank.

[0017] Using the above technical solution, the first pH meter is used to monitor the pH in real time during the removal of impurities from low-grade sodium aluminate.

[0018] Preferably, a second thermometer is provided on the coating groove.

[0019] Using the above technical solution, the second thermometer is used to monitor the temperature in real time during the titanium dioxide coating process.

[0020] Preferably, a second pH meter is provided on the coating groove.

[0021] Using the above technical solution, the second pH meter is used to monitor the pH during the titanium dioxide coating process in real time.

[0022] Preferably, a sedimentation tank is provided between the first filter press and the second preparation tank. The outlet of the first filter press is connected to the inlet of the sedimentation tank. The outlet of the sedimentation tank is connected to the inlet of the second impurity removal tank. The outlet of the second impurity removal tank is connected to the inlet of the third filter press. The inlet of the third filter press is connected to the second preparation tank through a pipe. Several layers of aluminum wire mesh are installed on the second impurity removal tank. The outlet of the sedimentation tank is located at the top of the sedimentation tank.

[0023] Using the above technical solution, a sedimentation tank is set up, and potassium permanganate and manganese sulfate solutions are added to the sedimentation tank. After reaction, the solutions settle and separate. The supernatant is then transferred to a second impurity removal tank containing aluminum wire mesh, and acid-washed fly ash is added. The mixture is then boiled and filtered through a third filter press to obtain a low-iron aluminum sulfate solution.

[0024] Preferably, an electric heating rod is provided on the inner wall of the second impurity removal tank, and the electric heating rod is electrically connected to an external power source.

[0025] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0026] A sodium aluminate preparation production line is used to prepare low-grade aluminum sulfate. The low-grade aluminum sulfate undergoes preliminary impurity removal to remove solid, suspended, and colloidal impurities. Then, the low-grade aluminum sulfate reacts with low-grade sodium hydroxide to produce sodium aluminate. By adjusting the pH and controlling a series of reaction conditions, iron impurities in the sodium aluminate are precipitated and removed through a first impurity removal tank. After that, it is fed into a titanium dioxide coating production line for coating. By using low-grade aluminum hydroxide and low-grade aluminum sulfate to prepare low-grade sodium aluminate, the production cost can be further reduced while ensuring the quality of titanium dioxide coating. Attached Figure Description

[0027] This utility model will be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the connection structure of a production line for a titanium dioxide coating process according to this utility model;

[0029] Figure 2 This is a schematic diagram of the connection structure of the production line for the titanium dioxide coating process in Embodiment 2 of this utility model, which includes a sedimentation tank and a second impurity removal tank.

[0030] Figure Labels

[0031] 1-First preparation tank; 2-Tail gas spray tower; 3-Tail gas fan; 4-First filter press; 5-Second preparation tank; 6-First impurity removal tank; 7-Second filter press; 8-Coating tank; 9-First thermometer; 10-First pH meter; 11-Second thermometer; 12-Second pH meter; 13-Sedimentation tank; 14-Aluminum wire mesh; 15-Second impurity removal tank; 16-Third filter press. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. The components of the embodiments of this application described and marked in the accompanying drawings can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0033] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this application 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 application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] The following is combined with Figures 1-2 This utility model will be described in detail.

[0035] Example 1

[0036] A production line for titanium dioxide coating process, see attached. Figure 1 The system includes a sodium aluminate preparation production line and a titanium dioxide coating production line connected to it via a pipeline. A first impurity removal tank 6 for removing impurities from the sodium aluminate is connected to the titanium dioxide coating production line via a pipeline. The sodium aluminate preparation production line is used to prepare low-grade aluminum sulfate. Preliminary impurity removal is performed on the low-grade aluminum sulfate to remove solid, suspended, and colloidal impurities. Then, the low-grade aluminum sulfate reacts with low-grade sodium hydroxide to produce sodium aluminate. By adjusting the pH and controlling a series of reaction conditions, iron impurities in the sodium aluminate precipitate out and are removed through the first impurity removal tank 6. Afterward, the solution is fed into the titanium dioxide coating production line for coating. By using low-grade aluminum hydroxide and low-grade aluminum sulfate to prepare low-grade sodium aluminate, the production cost can be further reduced while ensuring the quality of the titanium dioxide coating.

[0037] In this embodiment, the sodium aluminate preparation production line includes a first preparation tank 1. The outlet of the first preparation tank 1 is connected to a first filter press 4 via a pipe. The outlet of the first filter press 4 is connected to the inlet of a second preparation tank 5 via a pipe. The outlet of the second preparation tank 5 is connected to the inlet of a first impurity removal tank 6 via a pipe. A low-grade aluminum sulfate solution is prepared in the first preparation tank 1. The first filter press 4 removes solid, suspended matter, and colloidal impurities from the low-grade aluminum sulfate solution. Then, the impurity-removed aluminum sulfate solution is passed into the second preparation tank 5 to further react with low-grade sodium hydroxide to prepare low-grade sodium aluminate. Then, the low-grade sodium aluminate solution is passed into the first impurity removal tank 6 for impurity removal. The impurity removal step involves adding sodium hydroxide to increase the pH value of the solution, causing iron ions to form an insoluble ferric hydroxide precipitate, which is then removed by filtration.

[0038] In this embodiment, the titanium dioxide coating production line includes a second filter press 7 and a coating tank 8. The outlet of the first impurity removal tank 6 is connected to the inlet of the second filter press 7 through a pipeline, and the outlet of the second filter press 7 is connected to the inlet of the coating tank 8 through a pipeline. The second filter press 7 is used to remove solid, suspended and colloidal impurities from the sodium aluminate solution flowing out of the first impurity removal tank 6. After removing the impurities, the iron content in the sodium aluminate solution is greatly reduced, meeting the titanium dioxide coating standard, and then it is fed into the coating tank 8 for coating.

[0039] In this embodiment, the first preparation tank 1 is also provided with a tail gas outlet. The tail gas outlet is connected to the air inlet of the tail gas spray tower 2 through a pipeline, and the air outlet of the tail gas spray tower 2 is connected to the air inlet of the tail gas fan 3 through a pipeline. When the first preparation tank 1 prepares aluminum sulfate, a large amount of tail gas will be generated. The tail gas is fed into the tail gas spray tower 2 for spraying and then discharged through the air outlet of the spray tower and the tail gas fan 3.

[0040] In this embodiment, a first thermometer 9 is provided on the first impurity removal tank 6; the first thermometer 9 is used to monitor the temperature in real time during the impurity removal process of low-grade sodium aluminate.

[0041] The monitoring end of the first thermometer 9 is connected to the interior of the first impurity removal tank 6.

[0042] In this embodiment, a first pH meter 10 is provided on the first impurity removal tank 6; the first pH meter 10 is used to monitor the pH during the impurity removal process of low-grade sodium aluminate in real time.

[0043] The monitoring end of the first pH meter 10 is connected to the interior of the first impurity removal tank 6.

[0044] In this embodiment, a second thermometer 11 is provided on the coating groove 8; the second thermometer 11 is used to monitor the temperature during the titanium dioxide coating process in real time.

[0045] The monitoring end of the second thermometer 11 is connected to the interior of the coating groove 8.

[0046] In this embodiment, a second pH meter 12 is provided on the coating groove 8; the second pH meter 12 is used to monitor the pH during the titanium dioxide coating process in real time.

[0047] The monitoring end of the second pH meter 12 is connected to the interior of the coating groove 8.

[0048] Working principle and usage process:

[0049] A low-grade aluminum sulfate solution is prepared in the first preparation tank 1. A first filter press 4 removes solid, suspended matter, and colloidal impurities from the low-grade aluminum sulfate solution. The purified aluminum sulfate solution is then passed into the second preparation tank 5, where it reacts further with low-grade sodium hydroxide to prepare low-grade sodium aluminate. The low-grade sodium aluminate solution is then passed into the first impurity removal tank 6 for impurity removal. The impurity removal step involves adding sodium hydroxide to increase the pH value of the solution, causing iron ions to form an insoluble ferric hydroxide precipitate, which is then removed by filtration. A second filter press 7 is used to remove solid, suspended matter, and colloidal impurities from the sodium aluminate solution flowing out of the first impurity removal tank 6. After impurity removal, the iron content in the sodium aluminate solution is greatly reduced, meeting the titanium dioxide coating standard. The solution is then passed into the coating tank 8 for coating.

[0050] Example 2

[0051] In this embodiment, a sedimentation tank 13 is provided between the first filter press 4 and the second preparation tank 5, as shown in the attached figure. Figure 2 The discharge port of the first filter press 4 is connected to the inlet of the sedimentation tank 13. The discharge port of the sedimentation tank 13 is connected to the inlet of the second impurity removal tank 15. The discharge port of the second impurity removal tank 15 is connected to the inlet of the third filter press 16. The inlet of the third filter press 16 is connected to the second preparation tank 5 through a pipe. Several layers of aluminum wire mesh 14 are installed on the second impurity removal tank 15. The discharge port of the sedimentation tank 13 is located at the top of the sedimentation tank 13. By setting up the sedimentation tank 13, potassium permanganate and manganese sulfate solutions are added to the sedimentation tank 13. After reaction, sedimentation and separation occur. The supernatant is then transferred to the second impurity removal tank 15 containing aluminum wire mesh 14, and acid-washed fly ash is added. The mixture is boiled and filtered through the third filter press 16 to obtain a low-iron aluminum sulfate solution.

[0052] The aluminum wire mesh 14 consists of six layers.

[0053] In this embodiment, an electric heating rod is provided on the inner wall of the second impurity removal tank 15, and the electric heating rod is electrically connected to an external power source.

[0054] It should be noted that:

[0055] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A production line for a titanium dioxide coating process, characterized in that, It includes a sodium aluminate preparation production line and a titanium dioxide coating production line connected to it by a pipeline. The sodium aluminate preparation production line and the titanium dioxide coating production line are connected by a pipeline to a first impurity removal tank (6) for removing impurities from sodium aluminate.

2. The production line for titanium dioxide coating process according to claim 1, characterized in that, The sodium aluminate preparation production line includes a first preparation tank (1), the outlet of the first preparation tank (1) is connected to a first filter press (4) through a pipe, the outlet of the first filter press (4) is connected to the inlet of a second preparation tank (5) through a pipe, and the outlet of the second preparation tank (5) is connected to the inlet of a first impurity removal tank (6) through a pipe.

3. The production line for titanium dioxide coating process according to claim 1, characterized in that, The titanium dioxide coating production line includes a second filter press (7) and a coating tank (8). The outlet of the first impurity removal tank (6) is connected to the inlet of the second filter press (7) through a pipeline, and the outlet of the second filter press (7) is connected to the inlet of the coating tank (8) through a pipeline.

4. The production line for titanium dioxide coating process according to claim 2, characterized in that, The first preparation tank (1) is also provided with an exhaust gas outlet, which is connected to the air inlet of the exhaust gas spray tower (2) through a pipe, and the air outlet of the exhaust gas spray tower (2) is connected to the air inlet of the exhaust gas fan (3) through a pipe.

5. The production line for titanium dioxide coating process according to claim 1, characterized in that, A first thermometer (9) is installed on the first impurity removal tank (6).

6. The production line for titanium dioxide coating process according to claim 1, characterized in that, A first pH meter (10) is installed on the first impurity removal tank (6).

7. The production line for titanium dioxide coating process according to claim 3, characterized in that, A second thermometer (11) is provided on the coating groove (8).

8. The production line for titanium dioxide coating process according to claim 3, characterized in that, A second pH meter (12) is provided on the coating groove (8).

9. The production line for titanium dioxide coating process according to claim 2, characterized in that, A sedimentation tank (13) is provided between the first filter press (4) and the second preparation tank (5). The outlet of the first filter press (4) is connected to the inlet of the sedimentation tank (13). The outlet of the sedimentation tank (13) is connected to the inlet of the second impurity removal tank (15). The outlet of the second impurity removal tank (15) is connected to the inlet of the third filter press (16). The inlet of the third filter press (16) is connected to the second preparation tank (5) through a pipe. Several layers of aluminum wire mesh (14) are installed on the second impurity removal tank (15). The outlet of the sedimentation tank (13) is located at the top of the sedimentation tank (13).

10. The production line for titanium dioxide coating process according to claim 9, characterized in that, The inner wall of the second impurity removal tank (15) is provided with an electric heating rod, which is electrically connected to an external power source.

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