Titanium chloride finished product preparation method and system

Abstract

The invention relates to the technical field of chlorination process titanium dioxide production, and provides a preparation method and system of a titanium dioxide chloride finished product. The method comprises the following steps: uniformly mixing primary titanium dioxide chloride powder and desalted water in proportion to obtain titanium dioxide chloride slurry; conveying the titanium dioxide chloride slurry to a nano-particle separator, and obtaining oxidized primary slurry in different particle size ranges through the nano-particle separator; and respectively carrying out coating treatment on the oxidized primary product slurry in different particle size ranges, and then inputting the coated oxidized primary product slurry with different particle sizes into a gas-phase mixing tank according to a ratio for mixing to obtain a titanium dioxide chloride finished product meeting the target particle size requirement. According to the scheme, in the process of preparing the finished titanium dioxide chloride product meeting the target particle size requirement, the addition amount of the additive and reaction conditions in the preparation process do not need to be strictly controlled, the finished titanium dioxide chloride product particles with the good particle size distribution condition can also be obtained, and due to the fact that accurate control is not needed, the production cost is reduced, and the preparation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of titanium dioxide production by chloride process, and in particular to a method and system for preparing a finished product of titanium dioxide chloride. Background Art

[0002] In the prior art, there are chlorination method and sulfuric acid method for preparing finished titanium dioxide chloride (also known as titanium dioxide). Compared with the preparation method of sulfuric acid method, the chlorination method has the advantages of high degree of automation, advanced technology, high quality and environmental protection. Therefore, the chlorination method is generally used in the prior art to prepare finished titanium dioxide chloride. The optical properties of titanium dioxide chloride with different particle sizes are quite different. For example, titanium dioxide chloride with a particle size of 220~240nm has good visual whiteness, excellent hiding power and color-reducing power in water-based and oily systems, and titanium dioxide chloride with a particle size of 180~200nm has better white pigment properties in plastic and resin systems. Therefore, by reasonably adjusting the preparation process of titanium dioxide chloride, finished titanium dioxide chloride particles with different particle size distributions can be prepared, which can be used for different applications.

[0003] However, in the existing titanium dioxide chloride product preparation process, titanium dioxide chloride finished particles with different particle size distributions are generally prepared by strictly controlling the amount of additives added and the reaction conditions during the preparation process. Since the particle size distribution of the titanium dioxide chloride finished particles is extremely sensitive to the amount of additives added and the reaction conditions (such as temperature, pressure, reaction time, etc.), the difficulty of controlling the entire process increases, and precise control also leads to increased production costs. The particle size distribution of the titanium dioxide chloride finished particles is uneven, which is not conducive to improving the preparation efficiency.

[0004] Based on this, the existing technology is in urgent need of improvement. Summary of the invention

[0005] In view of the problem that in the prior art, finished titanium dioxide chloride particles with different particle size distributions are prepared by strictly controlling the amount of additives added and the reaction conditions during the preparation process, the process parameters are difficult to control, precise control leads to increased production costs, is not conducive to optimizing the particle size distribution of the finished titanium dioxide chloride particles, and reduces the preparation efficiency, the present disclosure provides a method and system for preparing finished titanium dioxide chloride particles.

[0006] According to a first aspect of the present invention, a method for preparing a finished product of titanium dioxide chloride is provided, comprising: Step a, uniformly mixing titanium dioxide chloride primary powder and desalted water in proportion to obtain titanium dioxide chloride slurry; Step b, transporting the titanium dioxide chloride slurry to a nanoparticle separator, and obtaining oxidized primary slurry in different particle size ranges through the nanoparticle separator; Step c, respectively coating the primary oxidation slurries within the different particle size ranges, and then inputting the coated primary oxidation slurries with different particle sizes into a gas phase mixing tank in proportion for mixing to obtain a titanium dioxide chloride product with a target particle size requirement.

[0007] In some embodiments, step a comprises: The primary titanium dioxide chloride powder and desalted water are evenly mixed in a ratio of 1:3 to obtain titanium dioxide chloride slurry.

[0008] In some embodiments, step b comprises: Step b1, delivering the titanium dioxide chloride slurry to a nanoparticle separator by a booster delivery pump; Step b2, obtaining the oxidized primary product slurry with different particle size ranges through the nanoparticle separator.

[0009] In some embodiments, the step b1 includes: The delivery pressure of the booster delivery pump is controlled to be 200-300 kPa, and the titanium dioxide chloride slurry is delivered to the nanoparticle separator through the booster delivery pump.

[0010] In some embodiments, step b2 comprises: The titanium dioxide chloride slurry is filtered in sequence through ultrafiltration membranes of different pore sizes of the nanoparticle separator to obtain primary oxidation slurries with particle sizes >280nm, 250<particle size≤280nm, 230<particle size≤250nm, 200<particle size≤230nm, 100<particle size≤200nm and particle size≤100nm.

[0011] In some embodiments, step c comprises: The primary oxidation product slurries within the different particle size ranges are respectively subjected to coating treatment, and the coated primary oxidation product slurries with different particle sizes are input into a gas phase mixing tank in proportion, and the proportions of 160nm particles, 190nm particles, 220nm particles, 250nm particles, 300nm particles, 350nm particles and 400nm particles in the primary oxidation product slurry are controlled to be 3.98%, 12.83%, 14.60%, 28.32%, 21%, 9.7% and 8.4% respectively, and the particles are evenly mixed in the gas phase mixing tank to obtain a finished titanium dioxide chloride product with an average particle size of 250nm.

[0012] In some embodiments, step c further comprises: The primary oxidation product slurries within the different particle size ranges are respectively subjected to coating treatment, and the coated primary oxidation product slurries with different particle sizes are input into a gas phase mixing tank in proportion, and the proportions of 120nm particles, 140nm particles, 160nm particles, 190nm particles, 220nm particles, 250nm particles and 300nm particles in the primary oxidation product slurry are controlled to be 3.5%, 9.79%, 15.03%, 20.98%, 23.07%, 18.18% and 7%, respectively. The products are evenly mixed in the gas phase mixing tank to obtain a finished titanium dioxide chloride product with an average particle size of 200nm.

[0013] According to a second aspect of the present invention, a system for preparing a finished product of titanium dioxide chloride is provided, comprising: A primary product slurry tank, which is used to contain primary titanium dioxide chloride powder and desalted water so that the two are evenly mixed to obtain titanium dioxide chloride slurry; A nanoparticle separator connected to the primary product slurry tank, the nanoparticle separator is used to separate the titanium dioxide chloride slurry into oxidized primary product slurries within different particle size ranges; A coating device connected to the nanoparticle separator, the coating device is used to coat the oxidized primary product slurries in different particle size ranges to obtain coated oxidized primary product slurries; A gas phase mixing tank connected to the coating device, the gas phase mixing tank is used to mix the oxidized primary product slurry with different particle sizes after coating input in proportion to obtain a titanium dioxide chloride finished product with a target particle size requirement; A finished product collector connected to the gas phase mixing tank is used to collect the titanium dioxide chloride finished product with the target particle size requirement.

[0014] In some embodiments, the titanium dioxide chloride finished product preparation system further includes a booster delivery pump disposed between the primary slurry tank and the nanoparticle separator, and the booster delivery pump is used to pump the titanium dioxide chloride slurry in the primary slurry tank into the nanoparticle separator.

[0015] In some embodiments, the nanoparticle separator comprises a primary product classification tank, which is used to collect the oxidized primary product slurry within each corresponding particle size range.

[0016] The above-mentioned method and system for preparing titanium dioxide chloride finished product, mix titanium dioxide chloride primary product powder and desalted water in proportion to obtain titanium dioxide chloride slurry and transport it to a nanoparticle separator, obtain oxidized primary product slurry in different particle size ranges through the nanoparticle separator, respectively coat the oxidized primary product slurries in different particle size ranges, and input the coated oxidized primary product slurries of different particle sizes into a gas phase mixing tank in proportion for mixing to obtain titanium dioxide chloride finished product with target particle size requirements. In the process of preparing titanium dioxide chloride finished product with target particle size requirements, it is not necessary to strictly control the amount of additives added and the reaction conditions in the preparation process, and titanium dioxide chloride finished product particles with better particle size distribution can also be obtained. Since precise control is not required, the production cost is reduced, which is conducive to improving the preparation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0018] Figure 1 A flow chart of a method for preparing a finished product of titanium dioxide chloride provided in one embodiment of the present invention; Figure 2 A schematic structural diagram of a system for preparing a titanium dioxide chloride product according to another embodiment of the present invention.

[0019] The reference numerals are as follows: 1. Primary product slurry tank; 2. Booster pump; 3. Nanoparticle separator; 4. Primary product classification tank; 5. Coating device; 6. Gas phase mixing tank; 7. Finished product collector. DETAILED DESCRIPTION

[0020] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0021] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0022] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0023] In addition, the words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0024] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0025] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0027] It should be understood that the embodiments of the present invention shown in the exemplary embodiments are only illustrative. Although only a few embodiments are described in detail in the present invention, it is easy for those skilled in the art to appreciate that multiple modifications are feasible without actually departing from the teaching of the subject matter of the present invention. Accordingly, all such modifications should be included within the scope of the present invention. Without departing from the gist of the present invention, other replacements, modifications, changes and deletions may be made to the design, operating conditions and parameters of the following exemplary embodiments.

[0028] Please refer to Figure 1 , Figure 1 The flowchart of a method for preparing a titanium dioxide chloride product provided by an embodiment of the present invention is shown. A method 100 for preparing a titanium dioxide chloride product comprises: Step a, uniformly mixing titanium dioxide chloride primary powder and desalted water in proportion to obtain titanium dioxide chloride slurry; Step b, transporting the titanium dioxide chloride slurry to a nanoparticle separator, and obtaining an oxidized primary product slurry within different particle size ranges through the nanoparticle separator; Step c, respectively coating the primary oxidation product slurries within different particle size ranges, and then inputting the coated primary oxidation product slurries with different particle sizes into a gas phase mixing tank in proportion for mixing to obtain a titanium dioxide chloride product with a target particle size requirement.

[0029] The above-mentioned method for preparing titanium dioxide chloride finished product comprises mixing titanium dioxide chloride primary product powder and desalted water in proportion to obtain titanium dioxide chloride slurry and conveying it to a nanoparticle separator, obtaining oxidized primary product slurries in different particle size ranges through the nanoparticle separator, coating the oxidized primary product slurries in different particle size ranges respectively, and inputting the coated oxidized primary product slurries of different particle sizes into a gas phase mixing tank in proportion for mixing to obtain titanium dioxide chloride finished product with target particle size requirements. In the process of preparing titanium dioxide chloride finished product with target particle size requirements, it is not necessary to strictly control the amount of additives added and the reaction conditions in the preparation process, and titanium dioxide chloride finished product particles with good particle size distribution can also be obtained. Since precise control is not required, the production cost is reduced, which is conducive to improving the preparation efficiency.

[0030] According to some embodiments of the present invention, step a includes: uniformly mixing titanium dioxide chloride powder and desalted water in a ratio of 1:3 to obtain titanium dioxide chloride slurry. After the titanium dioxide chloride powder and desalted water are mixed in a ratio of 1:3 to form a slurry, water is used as a dispersion medium to effectively separate the powder particles and evenly disperse them in the liquid phase, greatly improving the flow of the entire system.

[0031] According to some embodiments of the present invention, step b includes: step b1, delivering the titanium dioxide chloride slurry to the nanoparticle separator by means of a booster delivery pump; step b2, obtaining oxidized primary product slurry with different particle size ranges by means of the nanoparticle separator. The titanium dioxide chloride slurry is processed by the nanoparticle separator, so that it can be effectively separated into oxidized primary product slurries with different particle size ranges.

[0032] According to some embodiments of the present invention, step b1 includes: controlling the delivery pressure of the booster delivery pump to 200-300 kPa, and delivering the titanium dioxide chloride slurry to the nanoparticle separator through the booster delivery pump. Appropriate pressure promotes uniform mixing and dispersion of the titanium dioxide chloride slurry.

[0033] According to some embodiments of the present invention, step b2 includes: filtering the titanium dioxide chloride slurry in sequence through ultrafiltration membranes of different pore sizes of a nanoparticle separator to obtain oxidation primary slurries with particle sizes >280nm, 250<particle size≤280nm, 230<particle size≤250nm, 200<particle size≤230nm, 100<particle size≤200nm, and particle size≤100nm. Titanium dioxide chloride slurries with different particle sizes within a specific numerical range can be separated according to actual use requirements, and particles below 300nm can also be accurately classified. The average particle size of the primary titanium dioxide chloride produced can reach a controllable level of 100~300nm, and the production method also has the advantages of low cost and simple operation.

[0034] According to some embodiments of the present invention, step c includes: coating the primary oxidation product slurry in different particle size ranges respectively, inputting the primary oxidation product slurry of different particle sizes after coating into the gas phase mixing tank in proportion, controlling the 160nm particles, 190nm particles, 220nm particles, 250nm particles, 300nm particles, 350nm particles and 400nm particles in the primary oxidation product slurry to account for 3.98%, 12.83%, 14.60%, 28.32%, 21%, 9.7% and 8.4% respectively, and mixing them evenly through the gas phase mixing tank to obtain a titanium dioxide chloride product with an average particle size of 250nm. According to the target particle size requirement, the titanium dioxide chloride product can be proportioned in proportion by different particle sizes to accurately meet the product particle size requirements, optimize product performance, and increase the stability of product quality.

[0035] According to some embodiments of the present invention, step c also includes: coating the primary oxidation product slurry in different particle size ranges respectively, inputting the primary oxidation product slurry of different particle sizes after coating into the gas phase mixing tank in proportion, controlling the 120nm particles, 140nm particles, 160nm particles, 190nm particles, 220nm particles, 250nm particles and 300nm particles in the primary oxidation product slurry to account for 3.5%, 9.79%, 15.03%, 20.98%, 23.07%, 18.18% and 7% respectively, and mixing them evenly through the gas phase mixing tank to obtain a titanium dioxide chloride product with an average particle size of 200nm. The titanium dioxide chloride product according to the target particle size requirement can be accurately met by proportioning different particle sizes, optimizing product performance and increasing product quality stability.

[0036] In order to further understand the method for preparing a finished product of titanium dioxide chloride provided by the present invention, it is described in detail in a specific embodiment below.

[0037] Example 1 A titanium dioxide chloride product with an average particle size of 250 nm is prepared. First, titanium dioxide chloride primary powder (TiO2 primary powder) and desalted water are uniformly mixed in a ratio of 1:3 to obtain titanium dioxide chloride slurry. The delivery pressure of the booster delivery pump is controlled to be 200-300 kPa, and the titanium dioxide chloride slurry is pressed into the nanoparticle separator by the booster delivery pump. The titanium dioxide chloride slurry is filtered and separated step by step by the nanoparticle separator to obtain oxidized primary slurry with different particle size ranges. In this embodiment, the nanoparticle separator is provided with ultrafiltration membranes with pore sizes of 280 nm, 250 nm, 230 nm, 200 nm and 100 nm, respectively. The oxidized primary slurry with different particle size ranges of >280 nm, 250 <particle size ≤280 nm, 230 <particle size ≤250 nm, 200 <particle size ≤230 nm, 100 <particle size ≤200 nm and particle size ≤100 nm is obtained by filtering through ultrafiltration membranes with different pore sizes.

[0038] Preferably, the oxidized primary product slurries in different particle size ranges are respectively input into corresponding primary product classification tanks for storage to complete the particle size sorting of the primary product particles. Afterwards, the oxidized primary product slurries in different particle size ranges after the particle size sorting are respectively subjected to coating treatment. In this application, the coating process is the coating process in the prior art, so it is not described in detail. The coating process is used to obtain a variety of products with a diverse particle size distribution. According to the demand for the titanium dioxide chloride product with an average particle size of 250nm, the coated primary oxidation product slurry with different particle sizes is input into the gas phase mixing tank in proportion. In this embodiment, the 160nm particles, 190nm particles, 220nm particles, 250nm particles, 300nm particles, 350nm particles and 400nm particles in the primary oxidation product slurry are controlled to account for 3.98%, 12.83%, 14.60%, 28.32%, 21%, 9.7% and 8.4% respectively, and the mixture is evenly mixed through the gas phase mixing tank to obtain a titanium dioxide chloride product with an average particle size of 250nm. It can be understood that the preparation of the titanium dioxide chloride product with an average particle size of 250nm is not limited to the proportion of particles of different sizes in the primary oxidation product slurry listed in this application.

[0039] Example 2 A titanium dioxide chloride product with an average particle size of 200 nm is prepared. First, titanium dioxide chloride primary powder (TiO2 primary powder) and desalted water are uniformly mixed in a ratio of 1:3 to obtain titanium dioxide chloride slurry. The delivery pressure of the booster delivery pump is controlled to be 200-300 kPa, and the titanium dioxide chloride slurry is pressed into the nanoparticle separator by the booster delivery pump. The titanium dioxide chloride slurry is filtered and separated step by step by the nanoparticle separator to obtain oxidized primary slurry with different particle size ranges. In this embodiment, the nanoparticle separator is provided with ultrafiltration membranes with pore sizes of 280 nm, 250 nm, 230 nm, 200 nm and 100 nm, respectively. The oxidized primary slurry with different particle size ranges of >280 nm, 250 <particle size ≤280 nm, 230 <particle size ≤250 nm, 200 <particle size ≤230 nm, 100 <particle size ≤200 nm and particle size ≤100 nm is obtained by filtering through ultrafiltration membranes with different pore sizes.

[0040] Preferably, the oxidized primary product slurries in different particle size ranges are respectively input into corresponding primary product classification tanks for storage to complete the particle size sorting of the primary product particles. Afterwards, the oxidized primary product slurries in different particle size ranges after the particle size sorting are respectively subjected to coating treatment. In this application, the coating process is the coating process in the prior art, so it is not described in detail. The coating process is used to obtain a variety of products with a diverse particle size distribution. According to the demand for the titanium dioxide chloride product with an average particle size of 200nm, the oxidized primary product slurry with different particle sizes after coating is input into the gas phase mixing tank in proportion. In this embodiment, the 120nm particles, 140nm particles, 160nm particles, 190nm particles, 220nm particles, 250nm particles and 300nm particles in the oxidized primary product slurry are controlled to account for 3.5%, 9.79%, 15.03%, 20.98%, 23.07%, 18.18% and 7% respectively, and the chlorinated titanium dioxide product with an average particle size of 200nm is obtained by mixing evenly through the gas phase mixing tank. It can be understood that the preparation of the titanium dioxide chloride product with an average particle size of 200nm is not limited to the proportion of particles of different sizes in the oxidized primary product slurry listed in this application.

[0041] According to the second aspect of the present invention, a system for preparing a finished product of titanium dioxide chloride is provided. Figure 2, comprising a primary product slurry tank 1, a nanoparticle separator 3, a coating device 5, a gas phase mixing tank 6 and a finished product collector 7 connected in sequence. The primary product slurry tank 1 is used to contain primary titanium dioxide chloride powder and desalted water so that the two are evenly mixed to obtain titanium dioxide chloride slurry, the nanoparticle separator is used to separate the titanium dioxide chloride slurry into oxidized primary product slurry within different particle size ranges, the coating device 5 is used to coat the oxidized primary product slurry within different particle size ranges respectively to obtain coated oxidized primary product slurry; the gas phase mixing tank 6 is used to mix the oxidized primary product slurries of different particle sizes after coating input in proportion to obtain a titanium dioxide chloride finished product with a target particle size requirement, the finished product collector 7 is used to collect the titanium dioxide chloride finished product with a target particle size requirement, and the finished product collector 7 is used to collect the titanium dioxide chloride finished product with the target particle size requirement.

[0042] According to several embodiments of the present invention, please continue to refer to Figure 2 The titanium dioxide chloride finished product preparation system also includes a booster delivery pump 2 arranged between the primary slurry tank 1 and the nanoparticle separator 3, and the booster delivery pump is used to pump the titanium dioxide chloride slurry in the primary slurry tank 1 into the nanoparticle separator 3.

[0043] According to several embodiments of the present invention, please continue to refer to Figure 2 The nanoparticle separator 3 includes a primary product classification tank 4, which is used to collect the oxidized primary product slurry within each corresponding particle size range.

[0044] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0045] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for preparing a finished product of titanium dioxide chloride, characterized in that: include: Step a, uniformly mixing titanium dioxide chloride primary powder and desalted water in proportion to obtain titanium dioxide chloride slurry; Step b, transporting the titanium dioxide chloride slurry to a nanoparticle separator, and obtaining oxidized primary slurry in different particle size ranges through the nanoparticle separator; Step c, respectively coating the primary oxidation slurries within the different particle size ranges, and then inputting the coated primary oxidation slurries with different particle sizes into a gas phase mixing tank in proportion for mixing to obtain a titanium dioxide chloride product with a target particle size requirement.

2. The method for preparing a finished product of titanium dioxide chloride according to claim 1, characterized in that: The step a comprises: The primary titanium dioxide chloride powder and desalted water are evenly mixed in a ratio of 1:3 to obtain titanium dioxide chloride slurry.

3. The method for preparing a finished product of titanium dioxide chloride according to claim 1, characterized in that: The step b comprises: Step b1, delivering the titanium dioxide chloride slurry to a nanoparticle separator by a booster delivery pump; Step b2, obtaining the oxidized primary product slurry with different particle size ranges through the nanoparticle separator.

4. The method for preparing a finished product of titanium dioxide chloride according to claim 3, characterized in that: The step b1 comprises: The delivery pressure of the booster delivery pump is controlled to be 200-300 kPa, and the titanium dioxide chloride slurry is delivered to the nanoparticle separator through the booster delivery pump.

5. The method for preparing a finished product of titanium dioxide chloride according to claim 3, characterized in that: The step b2 comprises: The titanium dioxide chloride slurry is filtered in sequence through ultrafiltration membranes of different pore sizes of the nanoparticle separator to obtain primary oxidation slurries with particle sizes >280nm, 250<particle size≤280nm, 230<particle size≤250nm, 200<particle size≤230nm, 100<particle size≤200nm and particle size≤100nm.

6. The method for preparing a finished product of titanium dioxide chloride according to claim 5, characterized in that: The step c comprises: The primary oxidation product slurries within the different particle size ranges are respectively subjected to coating treatment, and the coated primary oxidation product slurries with different particle sizes are input into a gas phase mixing tank in proportion, and the proportions of 160nm particles, 190nm particles, 220nm particles, 250nm particles, 300nm particles, 350nm particles and 400nm particles in the primary oxidation product slurry are controlled to be 3.98%, 12.83%, 14.60%, 28.32%, 21%, 9.7% and 8.4% respectively, and the particles are evenly mixed in the gas phase mixing tank to obtain a finished titanium dioxide chloride product with an average particle size of 250nm.

7. The method for preparing a finished product of titanium dioxide chloride according to claim 5, characterized in that: The step c also includes: The primary oxidation product slurries within the different particle size ranges are respectively subjected to coating treatment, and the coated primary oxidation product slurries with different particle sizes are input into a gas phase mixing tank in proportion, and the proportions of 120nm particles, 140nm particles, 160nm particles, 190nm particles, 220nm particles, 250nm particles and 300nm particles in the primary oxidation product slurry are controlled to be 3.5%, 9.79%, 15.03%, 20.98%, 23.07%, 18.18% and 7%, respectively. The products are evenly mixed in the gas phase mixing tank to obtain a finished titanium dioxide chloride product with an average particle size of 200nm.

8. A system for preparing a finished product of titanium dioxide chloride, characterized in that: include: A primary product slurry tank, which is used to contain primary titanium dioxide chloride powder and desalted water so that the two are evenly mixed to obtain titanium dioxide chloride slurry; A nanoparticle separator connected to the primary product slurry tank, the nanoparticle separator is used to separate the titanium dioxide chloride slurry into oxidized primary product slurries within different particle size ranges; A coating device connected to the nanoparticle separator, the coating device is used to coat the oxidized primary product slurries in different particle size ranges to obtain coated oxidized primary product slurries; A gas phase mixing tank connected to the coating device, the gas phase mixing tank is used to mix the oxidized primary product slurry with different particle sizes after coating input in proportion to obtain a titanium dioxide chloride finished product with a target particle size requirement; A finished product collector connected to the gas phase mixing tank is used to collect the titanium dioxide chloride finished product with the target particle size requirement.

9. The system for preparing titanium dioxide chloride finished product according to claim 8, characterized in that: It also includes a booster delivery pump arranged between the primary slurry tank and the nanoparticle separator, and the booster delivery pump is used to pump the titanium dioxide chloride slurry in the primary slurry tank into the nanoparticle separator.

10. The system for preparing titanium dioxide chloride finished product according to claim 8, characterized in that: The nanoparticle separator comprises a primary product classification tank, which is used to collect the oxidized primary product slurry within each corresponding particle size range.

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