Titanium chloride finished product particle size sorting system and method

Abstract

The invention relates to the technical field of titanium dioxide chloride production, and provides a titanium dioxide chloride finished product particle size sorting system and method.The system comprises a stock bin, a sorting device and a control system, and the stock bin is used for collecting titanium dioxide chloride finished product particles; the multi-stage particle size classifier is connected with the stock bin and used for separating out sortable finished product particles with the particle size smaller than or equal to a first value from the titanium dioxide chloride finished product particles; the particle size classifier is connected with the multi-stage particle size classifier and comprises a multi-stage molecular film, and the multi-stage molecular film is used for sorting the sortable finished product particles into finished product particles in a plurality of particle size ranges; and the induced draft fan is connected with the particle size classifier and is used for providing required airflow for the movement of the titanium dioxide chloride finished product particles. According to the scheme, finer finished product particles in different particle size ranges can be sorted out from finished product particles of titanium chloride, the sorting fineness of the finished product particles of titanium chloride is improved, the connection relation among all the components is simple, operation is easy in actual production, and cost reduction and efficiency improvement are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of titanium dioxide chloride production, and in particular to a system and method for sorting the particle size of titanium dioxide chloride finished products. Background Art

[0002] The existing methods for preparing titanium dioxide chloride include the chlorination method and the sulfuric acid method. Since the chlorination method has the advantages of high automation, advanced technology, high quality and environmental protection, titanium dioxide chloride is generally prepared by the chlorination method in industrial production. However, the particle size of the prepared titanium dioxide chloride finished particles is different, and its application in practice is also different. Therefore, by reasonably adjusting the particle size distribution of the titanium dioxide chloride finished particles, the needs of different industries can be met. For this, the titanium dioxide chloride finished particles need to be sorted according to different particle size requirements.

[0003] However, the prior art has devices that can sort titanium dioxide chloride finished particles according to different particle size requirements, such as the published patent with application number 202210267117.0, a jet mill sorting device that can improve the powder particle size distribution, which can only achieve primary separation of coarse particles and is difficult to separate into particles of multiple particle size ranges at the same time, and requires strict control of the deflection angle, which makes the production process complicated and is not conducive to cost reduction and efficiency improvement.

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

[0005] In view of the problems in the prior art, the present invention provides a system and method for sorting the particle size of finished titanium dioxide chloride products.

[0006] According to a first aspect of the present invention, a system for sorting the particle size of a finished product of titanium dioxide chloride is provided, comprising: A silo, which is used to collect finished titanium dioxide chloride particles; A multi-stage particle size classifier connected to the silo, the multi-stage particle size classifier is used to separate the selectable finished particles whose particle size is less than or equal to the first value from the finished titanium dioxide chloride particles; A particle size classifier connected to the multi-stage particle size classifier comprises a multi-stage molecular membrane, wherein the multi-stage molecular membrane is used to classify the classifiable finished particles into finished particles of multiple particle size ranges; An induced draft fan connected to the particle size classifier is used to provide the required airflow for the movement of the titanium dioxide chloride finished particles.

[0007] In some embodiments, a dust collector is provided between the particle size classifier and the induced draft fan, and the dust collector is used to be turned on when the induced draft fan is turned off, so as to clear the particles mounted on the multi-stage molecular membrane.

[0008] In some embodiments, the particle size sorter also includes a multi-stage sorting chamber divided by the multi-stage molecular membrane, and the bottom of the multi-stage sorting chamber is respectively provided with corresponding small silos, and the small silos are used to collect the finished particles of the corresponding particle size range sorted.

[0009] In some embodiments, the multi-level molecular membranes are distributed inside the particle size sorter in the order of the particle sizes that can be passed from large to small.

[0010] In some embodiments, it can be located near the feed port of the particle size separator through the molecular membrane with the largest particle size.

[0011] In some embodiments, the first value is 300 nm.

[0012] In some embodiments, the multi-level molecular membrane is a five-level molecular membrane, and the five-level molecular membrane can sequentially pass particles with particle sizes of 280 nm, 250 nm, 230 nm, 200 nm, and 100 nm.

[0013] In some embodiments, the small silos in the multi-stage sorting chamber are used to collect sortable finished particles with 280nm<particle size<300nm, 250nm<particle size≤280nm, 230nm<particle size≤250nm, 200nm<particle size≤230nm, 100nm<particle size≤200nm and particle size≤100nm.

[0014] In some embodiments, the number of the multi-stage particle size classifiers is at least 3.

[0015] According to a second aspect of the present invention, a method for particle size sorting of finished titanium dioxide chloride is provided, comprising: Turning on the induced draft fan, so that the titanium dioxide chloride finished particles move from the silo to the multi-stage particle size classifier through the airflow provided by the induced draft fan; Separate the sortable finished particles whose particle size is less than or equal to the first value from the finished titanium dioxide chloride particles through the multi-stage particle size classifier and move them to the particle size classifier through the airflow; The sortable finished particles are sorted into finished particles of multiple particle size ranges by the multi-stage molecular membrane of the particle size sorter.

[0016] The above-mentioned titanium dioxide chloride finished product particle size sorting system and method, wherein the system includes a silo, a multi-stage particle size classifier, a particle size classifier and an induced draft fan connected in sequence, the silo is used to collect titanium dioxide chloride finished particles, the multi-stage particle size classifier is used to separate the sortable finished particles with a particle size less than or equal to a first value from the titanium dioxide chloride finished particles, the particle size classifier includes a multi-stage molecular membrane, the multi-stage molecular membrane is used to sort the sortable finished particles separated from the multi-stage particle size classifier into finished particles with multiple particle size ranges, and the induced draft fan is used to provide the required airflow for the movement of the titanium dioxide chloride finished particles. Through the mutual cooperation of the silo, the multi-stage particle size classifier, the particle size classifier and the induced draft fan in the system, the titanium dioxide chloride finished particles can be sorted into finer finished particles within different particle size ranges to improve the fineness of the sorting of the titanium dioxide chloride finished particles. At the same time, the connection relationship between the various components is simple, easy to operate in actual production, and conducive to cost reduction and efficiency improvement. 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 schematic diagram of the structure of a titanium dioxide chloride finished product particle size sorting system provided in one embodiment of the present invention; Figure 2 A schematic diagram of the structure of a particle size separator provided in another embodiment of the present invention; Figure 3 A flow chart of a method for particle size sorting of finished titanium dioxide chloride products provided in another embodiment of the present invention.

[0019] The reference numerals are as follows: 1. Silo; 2. First-stage particle size classifier; 3. Second-stage particle size classifier; 4. Third-stage particle size classifier; 5. Particle size classifier; 6. Dust collector; 7. Induced draft fan; 21. Particle size classifier; 31. Small silo; 32. Feed inlet; 33. Molecular membrane; 34. Classification chamber; 35. Discharge nozzle. 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] According to the first aspect of the present invention, please refer to Figure 1 , provides a titanium dioxide chloride finished product particle size sorting system, comprising a silo 1, a multi-stage particle size classifier 21, a particle size classifier 5 and an induced draft fan 7 connected in sequence. Among them, the silo 1 is used to collect titanium dioxide chloride finished product particles, the multi-stage particle size classifier 21 is used to separate the sortable finished product particles with a particle size less than or equal to a first value from the titanium dioxide chloride finished product particles, the particle size classifier includes a multi-stage molecular membrane 33, and the multi-stage molecular membrane 33 is used to sort the sortable finished particles into finished particles with multiple particle size ranges, and the induced draft fan 7 is used to adjust the fluidization gas velocity and feed amount of the titanium dioxide chloride finished particles, and provide the required airflow for the movement of the titanium dioxide chloride finished particles.

[0029] According to some embodiments of the present invention, the number of the multi-stage particle size classifiers 21 is at least 3. Figure 1 In this embodiment, the multi-stage particle size classifier 21 is a three-stage particle size classifier, which is a first-stage particle size classifier 2, a second-stage particle size classifier 3 and a third-stage particle size classifier 4 in the order from the silo 1 to the induced draft fan 7. At the same time, the first-stage particle size classifier 2, the second-stage particle size classifier 3 and the third-stage particle size classifier 4 play the same role, which are used to separate the sortable finished particles with a particle size less than or equal to the first value from the finished titanium dioxide chloride particles. Preferably, a collecting cabin is provided at the bottom of each stage of the particle size classifier to collect the finished particles with a particle size greater than the first value from the finished titanium dioxide chloride particles. In other words, the finished titanium dioxide chloride particles have completed a large range of sorting through the multi-stage particle size classifier 21, and can preliminarily separate the finished particles according to a wider particle size range, laying the foundation for subsequent refined sorting.

[0030] Please continue to refer to Figure 1 A dust collector 6 is provided between the particle size classifier 5 and the induced draft fan 7. The dust collector 6 is used to be turned on when the induced draft fan 7 is turned off, and is used to purge the particles mounted on the multi-stage molecular membrane 33. For example, the induced draft fan 7 is turned off once every 10 minutes, and the dust collector 6 is turned on to purge and collect the particles on the molecular membrane 33. After the collection is completed within 3 minutes, the dust collector 6 is turned off, and the induced draft fan 7 is restarted to continue running. The cycle is performed at this frequency to collect finished particles of different particle size ranges.

[0031] According to several embodiments of the present invention, Figure 1 Based on reference Figure 2 , Figure 2 A schematic diagram of the structure of a particle size sorter 5 provided for another embodiment of the present invention. The particle size sorter 5 includes a multi-stage sorting chamber 34 divided by a multi-stage molecular membrane 33, and the bottom of the multi-stage sorting chamber 34 is respectively provided with a corresponding small silo 31, and the small silo 31 is used to collect the finished particles of the corresponding particle size range sorted. The multi-stage molecular membrane 33 is distributed inside the particle size sorter 5 in the order from large to small through the particle size, and the molecular membrane 33 with the largest particle size can be located near the feed port 32 of the particle size sorter 5. Based on the distribution of the multi-stage molecular membrane 33 in the particle size sorter 5 and the multi-stage sorting chamber 34 formed by it, the finished particles of different particle size ranges can be sorted and collected inside the particle size sorter 5. The finished titanium dioxide chloride particles are sorted more finely. This highly accurate sorting method can ensure that the particle size distribution of each particle size range is extremely narrow, and can more accurately meet specific needs in application. Preferably, a discharge nozzle 35 is provided near the bottom of each small silo 31, through which titanium dioxide chloride finished particles within a corresponding particle size range can be directly obtained, thereby simplifying the complexity of the process and making the operation easier.

[0032] According to some embodiments of the present invention, the first value is 300nm. By limiting the first value, a wide range of titanium dioxide chloride finished particles is preliminarily divided. The titanium dioxide chloride finished particles below 300nm have a small and uniform particle size after sorting, which is conducive to the dispersibility of titanium dioxide chloride particles in various media (such as resin systems in coatings, emulsion matrices in cosmetics, etc.).

[0033] According to some embodiments of the present invention, the multi-level molecular membrane 33 is a five-level molecular membrane 33, which can sequentially pass particles with diameters of 280nm, 250nm, 230nm, 200nm and 100nm. The setting of this five-level molecular membrane can perform extremely fine and multi-level sorting on the finished titanium dioxide chloride particles.

[0034] According to some embodiments of the present invention, the small silo 31 in the multi-stage sorting chamber 34 is used to collect the sortable finished particles with a particle size of 280nm<particle size<300nm, 250nm<particle size≤280nm, 230nm<particle size≤250nm, 200nm<particle size≤230nm, 100nm<particle size≤200nm and particle size≤100nm. Specifically, pneumatic conveying of titanium dioxide chloride finished particles is achieved through power adjustment of the induced draft fan 7. At a suitable fluidizing gas velocity, titanium dioxide chloride finished particles enter the multi-stage particle size classifier 21, titanium dioxide chloride finished particles with a particle size of more than 300nm are collected in the multi-stage particle size classifier 21, and titanium dioxide chloride finished particles with a particle size of less than 300nm enter the particle size classifier 5, and pass through the molecular membranes 33 of 280nm, 250nm, 230nm, 200nm and less than 100nm respectively. A small silo 31 is arranged between each membrane layer to regularly blow and collect the particles on the molecular membrane 33, so that titanium dioxide chloride finished particles with particle sizes of more than 300nm, 280-300nm, 250-280nm, 230-250nm, 200-230nm, 100-200nm and less than 100nm can be obtained, which further optimizes the particle size distribution of the titanium dioxide chloride finished particles, greatly improves the stability of product quality, and meets the market's diverse needs. The average particle size of the finished product of titanium dioxide chloride produced by the method of the present invention can reach a controllable level of 100-300 nm. Through the layer-by-layer screening of the molecular membranes 33 at each level, the particles can be separated according to different very precise particle size ranges, so that the particles of each batch or each component finally obtained have extremely high accuracy and uniformity in particle size. At the same time, the present application also has the advantages of low cost and simple operation, and can bring obvious economic benefits when promoted and applied in the titanium dioxide industry.

[0035] The above-mentioned titanium dioxide chloride finished product particle size sorting system, through the mutual cooperation of the silo, multi-stage particle size classifier, particle size sorter and induced draft fan in the system, can sort the titanium dioxide chloride finished product particles into finer finished particles within different particle size ranges, so as to improve the fineness of the sorting of the titanium dioxide chloride finished product particles. At the same time, the connection relationship between the various components is simple, and it is easy to operate in actual production, which is conducive to reducing costs and increasing efficiency.

[0036] According to the second aspect of the present invention, a method for particle size sorting of finished titanium dioxide chloride is also provided. Figure 3 As shown, it includes: step a, turning on the induced draft fan, and moving the titanium dioxide chloride finished particles from the silo to the multi-stage particle size classifier through the airflow provided by the induced draft fan; step b, separating the sortable finished particles with a particle size less than or equal to a first value from the titanium dioxide chloride finished particles through the multi-stage particle size classifier and moving them to the particle size classifier through the airflow; step c, sorting the sortable finished particles into finished particles with multiple particle size ranges through the multi-stage molecular membrane of the particle size classifier.

[0037] In a specific embodiment, the operating frequency of the induced draft fan is adjusted to move the finished titanium dioxide chloride particles (11 t / h feed amount) from the silo to the multi-stage particle size classifier, and the flow velocity of the finished particles is controlled to be 57 m / s. The finished titanium dioxide chloride particles with a particle size of more than 300 nm are collected in the multi-stage particle size classifier; the finished titanium dioxide chloride particles with a particle size of less than 300 nm enter the particle size classifier, and pass through the molecular membranes of 280 nm, 250 nm, 230 nm, 200 nm and less than 100 nm respectively inside the particle size classifier, and a small silo is set between each membrane layer. The induced draft fan is closed every 10 minutes. The collector is opened to blow and collect the particulate materials on the molecular membrane. After the collection is completed within 3 minutes, the collector is closed, and the induced draft fan is started to continue running. This is a cycle operation, and titanium dioxide products with particle sizes of >300nm, 280~300nm, 250~280nm, 230~250nm, 200~230nm, 100~200nm and below 100nm can be obtained. The average particle sizes are 350±10nm, 280±10nm, 230±10nm, 200±10nm, 190±10nm and 50±10nm.

[0038] 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.

[0039] 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 system for sorting the particle size of finished titanium dioxide chloride products, characterized in that: include: A silo, the silo is used to collect finished titanium dioxide chloride particles; A multi-stage particle size classifier connected to the silo, the multi-stage particle size classifier is used to separate the selectable finished particles whose particle size is less than or equal to the first value from the finished titanium dioxide chloride particles; A particle size classifier connected to the multi-stage particle size classifier comprises a multi-stage molecular membrane, wherein the multi-stage molecular membrane is used to classify the classifiable finished particles into finished particles of multiple particle size ranges; An induced draft fan connected to the particle size classifier is used to provide the required airflow for the movement of the titanium dioxide chloride finished particles.

2. The titanium dioxide chloride finished product particle size sorting system according to claim 1, characterized in that: A dust collector is arranged between the particle size classifier and the induced draft fan. The dust collector is used to be turned on when the induced draft fan is turned off, so as to sweep away the particles mounted on the multi-stage molecular membrane.

3. The finished product particle size sorting system of titanium dioxide chloride according to claim 1, characterized in that: The particle size sorter also includes a multi-stage sorting cavity divided by the multi-stage molecular membrane, and the bottom of the multi-stage sorting cavity is respectively provided with corresponding small silos, and the small silos are used to collect the finished particles of the corresponding particle size range after sorting.

4. The finished product particle size sorting system of titanium dioxide chloride according to claim 3 is characterized in that: The multi-level molecular membranes are distributed inside the particle size separator in the order of the particle sizes that can pass through from large to small.

5. The finished product particle size sorting system of titanium dioxide chloride according to claim 4, characterized in that: It can be located near the feed inlet of the particle size classifier through the molecular membrane with the largest particle size.

6. The finished product particle size sorting system of titanium dioxide chloride according to claim 4, characterized in that: The first value is 300 nm.

7. The finished product particle size sorting system of titanium dioxide chloride according to claim 6, characterized in that: The multi-level molecular membrane is a five-level molecular membrane, and the five-level molecular membrane can pass particles with particle sizes of 280nm, 250nm, 230nm, 200nm and 100nm in sequence.

8. The finished product particle size sorting system of titanium dioxide chloride according to claim 7, characterized in that: The small silos in the multi-stage sorting chamber are respectively used to collect sortable finished particles with a particle size of 280nm<particle size<300nm, 250nm<particle size≤280nm, 230nm<particle size≤250nm, 200nm<particle size≤230nm, 100nm<particle size≤200nm and particle size≤100nm.

9. The titanium dioxide chloride finished product particle size sorting system according to claim 1, characterized in that: The number of the multi-stage particle size classifiers is at least 3.

10. A method for sorting the particle size of finished titanium dioxide chloride products, characterized in that: include: Turning on the induced draft fan, so that the titanium dioxide chloride finished particles move from the silo to the multi-stage particle size classifier through the airflow provided by the induced draft fan; Separate the sortable finished particles whose particle size is less than or equal to the first value from the finished titanium dioxide chloride particles through the multi-stage particle size classifier and move them to the particle size classifier through the airflow; The sortable finished particles are sorted into finished particles of multiple particle size ranges by the multi-stage molecular membrane of the particle size sorter.

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