Method and apparatus for removing impurities from pellets

Abstract

The present invention uses the acoustic energy of sound waves to exert an acoustic fatigue effect on pellets and impurities attached to their surfaces, weakening the bonding force between the pellets and the impurities, and thus removing them. Compared to the prior art, the present invention can remove impurities in pellets quickly and effectively, with high separation efficiency and precision. [Solution] The present invention provides a method and apparatus for removing impurities in pellets, the method including the steps of employing at least one of a low-frequency acoustic gas wave-guiding mode, a high-frequency acoustic gas wave-guiding mode, and a high-frequency acoustic solid wave-guiding mode to transmit acoustic waves to the pellets from which impurities are to be removed, thereby weakening the bonding force between the pellets and the impurities in the pellets from which impurities are to be removed, and employing an air flow to strengthen the separation between the impurities and the pellets, wherein the low-frequency acoustic gas wave-guiding mode means that low-frequency acoustic waves are transmitted using gas as a wave-guiding medium, the high-frequency acoustic gas wave-guiding mode means that high-frequency acoustic waves are transmitted using gas as a wave-guiding medium, and the high-frequency acoustic solid wave-guiding mode means that high-frequency acoustic waves are transmitted using a solid as a wave-guiding medium.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] The present invention claims priority to a Chinese invention patent with patent application number 202011282872.3, filed on November 17, 2020, a Chinese invention patent with patent application number 202110325003.2, filed on March 26, 2021, and a Chinese utility model patent with patent application number 202120618127.5, filed on March 26, 2021. [Technical field]

[0002] The present invention relates to the technical field of impurity removal, and in particular to a method and apparatus for removing impurities in pellets. [Background technology]

[0003] Granular materials contain a large amount of impurities, which exist in the form of dust, fluff, fine particles, strings, etc., and therefore have a negative impact on subsequent production processes. In order to remove these impurities, water washing methods, mechanical vibration methods, etc. are currently commonly used. However, all of these methods have disadvantages such as low separation efficiency, poor separation accuracy, high investment costs, and large equipment volume, making it difficult to remove impurities quickly and effectively. Summary of the Invention [Problem to be solved by the invention]

[0004] SUMMARY OF THE PRESENT EMBODIMENTS The present invention aims to provide a method and apparatus for removing impurities from pellets in order to solve the problem in the prior art that it is difficult to remove impurities quickly and effectively. [Means for solving the problem]

[0005] In order to achieve the above-mentioned object, the present invention provides an apparatus for removing impurities in pellets, comprising a housing having a separation cavity, and a blower for introducing an air flow into the separation cavity and / or an induced draft blower for guiding an air flow, and further comprising at least one of a low-frequency sound wave generator, a first high-frequency sound wave generator and a high-frequency sound wave solid-wave guide module, wherein the low-frequency sound waves generated from the low-frequency sound wave generator and the high-frequency sound waves generated from the first high-frequency sound wave generator can be transmitted to the pellets in the separation cavity from which impurities are to be removed using gas as a wave-guiding medium, and the high-frequency sound wave solid-wave guide module comprises a connected second high-frequency sound wave generator and a solid wave-guiding medium, and the high-frequency sound waves generated from the second high-frequency sound wave generator can be transmitted from the solid wave-guiding medium to the pellets in the separation cavity from which impurities are to be removed.

[0006] The present invention further provides a method for removing impurities in pellets, which includes the steps of adopting at least one of a low-frequency acoustic gas wave-guiding mode, a high-frequency acoustic gas wave-guiding mode and a high-frequency acoustic solid wave-guiding mode to transmit acoustic waves to the pellets to be removed, thereby weakening the bonding force between the pellets and the impurities in the pellets to be removed, and at the same time adopting an air flow to strengthen the separation between the impurities and the pellets, in which the low-frequency acoustic gas wave-guiding mode means that the low-frequency acoustic waves are transmitted using gas as a wave-guiding medium, the high-frequency acoustic gas wave-guiding mode means that the high-frequency acoustic waves are transmitted using gas as a wave-guiding medium, and the high-frequency acoustic solid wave-guiding mode means that the high-frequency acoustic waves are transmitted using a solid as a wave-guiding medium.

[0007] The present invention further provides an apparatus for removing impurities in pellets, which is used in the above-mentioned method for removing impurities in pellets, the apparatus including a housing having a separation cavity, and a blower for introducing an air flow into the separation cavity and / or an induced draft blower for guiding the air flow, the apparatus further including at least one of a low frequency acoustic generator, a first high frequency acoustic generator and a high frequency acoustic solid-waveguide module, wherein an operation mode of the low frequency acoustic generator is the low frequency acoustic gas-waveguide mode, an operation mode of the first high frequency acoustic generator is the high frequency acoustic gas-waveguide mode, an operation mode of the high frequency acoustic solid-waveguide module is the high frequency acoustic solid-waveguide mode, and the high frequency acoustic solid-waveguide module includes a second high frequency acoustic generator and a solid waveguiding medium connected thereto. Effect of the Invention

[0008] Features and advantages of the method and apparatus for removing impurities in pellets of the present invention include the following: The present invention uses the acoustic energy of sound waves to achieve acoustic fatigue on the pellets and the impurities attached to their surfaces, weakening the bonding force between the pellets and the impurities and thus removing them, creating gaps or separation between the two, converting the attached impurities into dispersed impurities, and combining with the wind current to blow the dispersed impurities away from the pellets, realizing efficient separation of the pellets and impurities and highly purifying the pellets. Compared with the prior art, the present invention can quickly and effectively remove impurities in the pellets, especially the attached impurities. By adopting the method of the present invention to remove impurities in the pellets, the separation efficiency is high, the separation accuracy is high and the investment cost is low. [Brief description of the drawings]

[0009] The following drawings are intended only to illustratively explain and interpret the present invention, and are not intended to limit the scope of the present invention. [Figure 1] 1 is a schematic plan view of the structure of an apparatus for removing impurities from pellets according to an embodiment of the present invention; [Diagram 2]1 is a schematic diagram showing the three-dimensional structure of an apparatus for removing impurities from pellets according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a plan view of the first slide plate of FIG. 2. [Figure 4] FIG. 4 is a side view of the slide plate of FIG. 3. [Diagram 5] FIG. 4 is a partial enlarged view of part A in FIG. [Figure 6] FIG. 4 is a front view of the second slide plate. [Figure 7] FIG. 7 is a plan view of the slide plate of FIG. 6. [Figure 8] FIG. 13 is a front view of the third slide plate. [Figure 9] FIG. 9 is a plan view of the slide plate of FIG. 8. [Figure 10] FIG. 13 is a front view of the fourth slide plate. [Figure 11] FIG. 11 is a plan view of the slide plate of FIG. [Figure 12] FIG. 13 is a front view of the fifth slide plate. [Figure 13] FIG. 13 is a plan view of the slide plate of FIG. 12. [Figure 14] FIG. 13 is a front view of the sixth slide plate. [Figure 15] FIG. 15 is a plan view of the slide plate of FIG. [Figure 16] FIG. 13 is a front view of the seventh slide plate. [Figure 17] FIG. 17 is a plan view of the slide plate of FIG. 16. [Figure 18] FIG. 13 is a front view of the eighth slide plate. [Figure 19] FIG. 19 is a plan view of the slide plate of FIG. 18. [Figure 20] FIG. 1 is a schematic diagram of a first dispersion method. [Figure 21] FIG. 13 is a schematic diagram of a second dispersion method. [Figure 22] FIG. 22 is a plan view of FIG. 21. [Figure 23] FIG. 13 is a schematic diagram of the third dispersion method. [Figure 24] FIG. 24 is a plan view of FIG. 23. [Diagram 25] FIG. 13 is a schematic diagram of a fourth dispersion method. [Figure 26] FIG. 13 is a schematic diagram of the fifth spraying method. [Figure 27] FIG. 27 is a plan view of FIG. 26. [Figure 28] FIG. 13 is a schematic diagram of the sixth dispersion method. [Figure 29] FIG. 13 is a schematic diagram of the seventh dispersion method. [Diagram 30] FIG. 13 is a schematic diagram of the eighth spraying method. [Diagram 31] FIG. 13 is a schematic diagram of the ninth dispersion method. [Diagram 32] FIG. 32 is a plan view of FIG. 31. [Diagram 33] FIG. 16 is a schematic diagram of the tenth dispersion method. [Diagram 34] FIG. 34 is a plan view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] In order to more clearly understand the technical features, objects and effects of the present invention, specific embodiments of the present invention will be described in the context of the accompanying drawings. Here, the adjectival or adverbial modifiers "up" and "down", "top" and "bottom", "inside" and "outside" are used only to facilitate relative reference between a plurality of sets of terms, and do not describe any particular directional limitation of the modified terms. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying a relative importance or implying the number of the technical features indicated, so that a feature limited to "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, unless otherwise specified, the term "connection" should be understood in a broad sense, for example, it may be a fixed connection, a removable connection, a direct connection, or an indirect connection via an intermediate medium, and the specific meaning of the above term in this patent can be understood by those skilled in the art according to the circumstances.

[0011] For ease of explanation, in this specification, the particulate matter is referred to as a "pellet", and the pellet with the impurities adsorbed thereon is referred to as a "pellet from which impurities are to be removed".

[0012] Impurities in pellets mainly exist in two forms: dispersed and attached, and attached impurities are attached (adsorbed) to the pellet surface by binding forces such as electromagnetic force, liquid bridging force, van der Waals force, etc., which is both a difficulty and a key point in pellet cleaning. Conventional technologies usually adopt water washing method, mechanical vibration method, etc. to remove impurities in pellets, but all of these methods have disadvantages such as low separation efficiency, poor separation accuracy, high investment cost, and large equipment volume, making it difficult to remove impurities quickly and effectively, especially attached impurities. EMBODIMENT 1

[0013] In order to solve the above problems of the prior art, the present invention provides a method for removing impurities in pellets, which employs at least one of a low-frequency sonic gas-wave guided mode, a high-frequency sonic gas-wave guided mode, and a high-frequency sonic solid-wave guided mode to transmit acoustic energy of a sound wave to the pellets from which impurities are to be removed, thereby weakening the binding forces between the pellets and the impurities in the pellets from which impurities are to be removed, such as electromagnetic forces, liquid bridge forces, van der Waals forces, etc., and at the same time, employing an air flow to strengthen the separation between the impurities and the pellets, for example by blowing air onto the pellets from which impurities are to be removed to blow the impurities away from the pellets, thereby removing the pellets. The present invention includes a step of completely separating the gas and impurities, in which the low-frequency acoustic gas-waveguide mode is a step in which the low-frequency acoustic wave is transmitted using air as a waveguiding medium, the high-frequency acoustic gas-waveguide mode is a step in which the high-frequency acoustic wave is transmitted using air as a waveguiding medium, and the high-frequency acoustic solid-waveguide mode is a step in which the high-frequency acoustic wave is transmitted using a solid as a waveguiding medium, and in which the frequency of the low-frequency acoustic wave in the present invention is 1 Hz to 350 Hz, preferably 10 Hz to 350 Hz, and the frequency of the high-frequency acoustic wave is 6 kHz to 40 kHz, for example 9 kHz or 12 kHz, and preferably the frequency of the high-frequency acoustic wave is 6 Hz to 20 Hz.

[0014] The present invention uses the acoustic energy of sound waves to perform acoustic fatigue on the pellets and the impurities attached to their surfaces, weakening the bonding force between the pellets and the impurities and thus removing them, creating gaps or separation between the two, converting the attached impurities into dispersed impurities, and combining with the wind current to blow the dispersed impurities away from the pellets, realizing efficient separation of the pellets and the impurities, and highly purifying the pellets. Compared with the prior art, the present invention can quickly and effectively remove impurities in the pellets, especially the attached impurities. The method of the present invention is used to remove impurities in the pellets, with high separation efficiency, high separation precision, and low investment cost.

[0015] In carrying out the method of the present invention, any one of the three modes may be used, any two of the three modes may be used simultaneously, or all three modes may be used simultaneously, for example, only the low frequency sonic gas-guided mode may be used, or only the high frequency sonic gas-guided mode may be used, or the low frequency sonic gas-guided mode and the high frequency sonic gas-guided mode may be used simultaneously, or the low frequency sonic gas-guided mode and the high frequency sonic solid-guided mode may be used simultaneously, or the high frequency sonic gas-guided mode and the high frequency sonic solid-guided mode may be used simultaneously, or the low frequency sonic gas-guided mode, the high frequency sonic gas-guided mode and the high frequency sonic solid-guided mode may be used simultaneously.

[0016] The mechanism of action of the low-frequency sound wave gas guided mode on the pellets to be removed from impurities is as follows: the low-frequency sound wave of this mode can play an acoustic fatigue effect on the binding force between the impurities on the pellet surface and the pellets, the intensity of the sound wave is called the sound energy flux density, the intensity of the sound wave is proportional to the square of the amplitude of the sound wave, under the action of the low-frequency sound wave with a certain sound energy flux density, the binding force between the impurities on the pellets and the pellets can be weakened to the maximum, and even the binding force approaches zero, causing a spatial gap or separation between the pellets and the impurities, and converting the attached impurities into dispersed impurities.

[0017] The mechanism of action of the high frequency sound wave gas guided wave mode on the pellets to be removed from impurities is as follows: the high frequency sound wave of this mode not only has the above-mentioned effect of the low frequency sound wave, but also has a strong penetrating power, which can greatly weaken the bonding force between the pellets and the impurities, causing spatial gaps or separation between the pellets and the impurities, and converting the attached impurities into dispersed impurities.

[0018] The action mechanism of the combination of low-frequency sonic gas-guiding mode and high-frequency sonic gas-guiding mode on the pellets to be removed from impurities is as follows: high-frequency sonic waves are applied on the basis of low-frequency sonic waves to strengthen the dissolving effect on the binding force between the pellets and impurities, and the introduced high-frequency sonic waves can further weaken the binding force, causing gaps between the pellets and the impurities on their surface, and increasing the gaps, thereby enhancing the effect of separation and cleaning.

[0019] The mechanism of action of the high frequency sound wave solid waveguiding mode on the pellets from which impurities are to be removed is as follows: the wave energy of the high frequency sound wave is transmitted to the solid waveguiding medium, causing the solid waveguiding medium to vibrate according to the high frequency sound wave, and the high frequency sound wave directly acts on the pellets from which impurities are to be removed that are in contact with the solid waveguiding medium through the solid waveguiding medium, thereby generating a fatigue effect on the binding force between the pellets from which impurities are to be removed and the impurities flowing through the solid waveguiding medium, weakening or eliminating the binding force between the two, generating gaps or separations between the impurities attached to the surface of the pellets and the pellets, and converting the attached impurities into dispersed impurities.

[0020] In one embodiment, at least two of the low frequency sonic gas-guided mode, high frequency sonic gas-guided mode and high frequency sonic solid-guided mode are adopted to transmit the sonic waves to the pellets to be removed from, so as to further enhance the effect of removing impurities, for example, any two of the low frequency sonic gas-guided mode, high frequency sonic gas-guided mode and high frequency sonic solid-guided mode are adopted simultaneously, or these three modes are adopted simultaneously.

[0021] According to the inventors' research, the frequency, amplitude and waveform of the sound wave also affect the effect of weakening the bonding force between the pellets and the impurities, so when implementing the present invention, the frequency, amplitude and waveform of the sound wave in each mode can be determined according to actual needs.

[0022] In one embodiment, the frequency of the low frequency acoustic waves in the low frequency acoustic gas-guided mode is one frequency or a combination of multiple frequencies, the frequency of the high frequency acoustic waves in the high frequency acoustic gas-guided mode is one frequency or a combination of multiple frequencies, and the frequency of the high frequency acoustic waves in the high frequency acoustic solid-guided mode is one frequency or a combination of multiple frequencies. That is, in each mode, a single frequency of acoustic waves may be employed, or multiple different frequencies of acoustic waves may be employed simultaneously. In the case of high frequency acoustic waves, the higher the frequency, the higher the vibrational penetration into the pellet.

[0023] Taking the low-frequency sonic gas guided wave mode as an example, it can adopt a low-frequency sonic wave of one frequency, or adopt multiple low-frequency sonic waves of different frequencies simultaneously. When using two or three modes simultaneously, it can adopt multiple high-frequency sonic waves of different frequencies and multiple low-frequency sonic waves of different frequencies simultaneously. When using the sonic wave combination method of different frequency bands of high and low frequencies, the sonic waves of different frequency bands can be one main and the other auxiliary according to the properties of the material, or both of the two sonic waves can be main.

[0024] In the impurity removal process, the frequency of the sound waves may be fixed, adjustable, or even swept frequency (automatic frequency conversion), and the frequency may be manually controlled or automatically adjusted.

[0025] In one embodiment, the amplitude of the low frequency sound wave in the low frequency sound wave gas guided mode is one amplitude or a combination of multiple amplitudes, the amplitude of the high frequency sound wave in the high frequency sound wave gas guided mode is one amplitude or a combination of multiple amplitudes, and the amplitude of the high frequency sound wave in the high frequency sound wave solid guided mode is one amplitude or a combination of multiple amplitudes. The amplitude of the sound wave in each mode is suitable so that the noise at a distance of 1 meter from the device is not more than 85 decibels (or meets the local environmental protection requirements). If this condition is met, the higher the frequency of the sound wave, the better the effect of weakening the binding force between pellets and impurities.

[0026] In one embodiment, the low frequency acoustic waveform in the low frequency acoustic gas-guided mode is one waveform or a combination of multiple waveforms, the high frequency acoustic waveform in the high frequency acoustic gas-guided mode is one waveform or a combination of multiple waveforms, and the high frequency acoustic waveform in the high frequency acoustic solid-guided mode is one waveform or a combination of multiple waveforms. Alternative waveforms include sine, triangular, square and pulse waves, although multiple waveforms may be employed simultaneously in an implementation.

[0027] Taking the high frequency sonic gas guided wave mode as an example, a high frequency sonic wave of one waveform may be adopted, or multiple high frequency sonic waves of different waveforms may be adopted simultaneously. When two or three modes are used simultaneously, multiple high frequency sonic waves of different waveforms and multiple low frequency sonic waves of different waveforms may be adopted simultaneously.

[0028] According to the requirements for separation cleanliness of pellet impurities, when the requirements for separation cleanliness are high, the three modes can be used in combination, and the amplitude can be adjusted to the limit of noise control, and low frequencies of low frequency sound waves (for example, 1Hz-20Hz), high frequencies of high frequency sound waves (for example, 30kHz-40kHz), and single-frequency sine waves can be used as much as possible; when the requirements for separation cleanliness are low, the requirements can be reduced according to cost or other factors, and one or two of these modes can be dominant, or various combination methods of organic combinations of waveforms, modes and amplitudes can be adopted; when the requirements for separation cleanliness are extremely high, in addition to the high frequency sound wave solid wave guided mode, the sonification effect of the low frequency sound wave solid wave guided mode can be increased, and the effect of sound waves can be further exerted and excavated.

[0029] In one embodiment, in a state where the pellets to be removed from the impurities are in a flowing state, at least one of a low frequency acoustic gas guided mode, a high frequency acoustic gas guided mode, and a high frequency acoustic solid guided mode is adopted to transmit the acoustic waves to the pellets to be removed from the impurities. For example, a chamber is provided in which the pellets to be removed from the impurities are in a flowing state instead of being statically piled up, and acoustic waves are introduced into the chamber, so that the pellets to be removed from the impurities are in a flowing state, which can further improve the effect of removing the impurities, and is also advantageous in blowing away the impurities by wind currents.

[0030] In one embodiment, in a state where at least one of plasma, microwave, infrared, and dry ice is applied to the pellets from which impurities are to be removed, at least one of a low frequency acoustic gas guided mode, a high frequency acoustic gas guided mode, and a high frequency acoustic solid guided mode is adopted to transmit the acoustic waves to the pellets from which impurities are to be removed, thereby further improving the effect of removing impurities. For example, at least two or at least three of plasma, microwave, infrared, and dry ice are applied to the pellets from which impurities are to be removed, or four are applied simultaneously.

[0031] In one embodiment, the solid wave-guiding medium in the high frequency acoustic solid wave-guiding mode is a thin film, a metal plate or a plastic plate, and of course it can be various other solid materials and forms according to the corresponding operating conditions, and when used, multiple solid wave-guiding media can be adopted at the same time, for example, the solid wave-guiding medium can be a sliding plate, a distributor or / and a flow plate, etc.

[0032] In the present invention, the pellets are generally granular solids with a particle size of 0.8 mm to 20 mm, and their external shape may be spherical, oval, rectangular, cylindrical, water droplet-like, or other irregular shapes. The impurities are generally dust, fluff, strings, scraps, water droplets, flakes, pieces, dirt, liquid droplets, etc. mixed in the pellets, and the dust, dust, and scraps generally refer to fine particles with a particle size of less than 500 μm. The material of the impurities may be the same as or different from the pellets, and the impurities may be particles, strings, or fluff, and the impurities may be solid fine particles or liquid droplets. EMBODIMENT 2

[0033] As shown in FIG. 1, the present invention further provides an apparatus for removing impurities in pellets, which is an apparatus used in the method for removing impurities in pellets of embodiment 1, and the apparatus includes a housing 1 having a separation cavity 11 therein, and further includes at least one of a low-frequency sound wave generator 2, a first high-frequency sound wave generator 3 and a high-frequency sound solid-wave guide module, and a blower for introducing an air flow Q into the separation cavity 11 and / or an induced draft blower for guiding the air flow Q.

[0034] Here, the operation mode of the low-frequency sound generator is the low-frequency sound gas-wave-guiding mode described in embodiment 1, the operation mode of the first high-frequency sound generator is the high-frequency sound gas-wave-guiding mode described in embodiment 1, and the operation mode of the high-frequency sound solid-wave-guiding module is the high-frequency sound solid-wave-guiding mode described in embodiment 1. The low-frequency sound waves generated from the low-frequency sound generator 2 and the high-frequency sound waves generated from the first high-frequency sound generator 3 can be transmitted to the pellets in the separation cavity 11 from which impurities are to be removed, using the gas in the separation cavity 11 as a wave-guiding medium, and the high-frequency sound solid-wave-guiding module can be connected to the second high-frequency sound generator 2 and the high-frequency sound generator 3. The second high-frequency sound wave generating device 4 includes a wave generating device 4 and a solid wave-guiding medium, which is provided in the separation cavity 11 and must be located on the essential path of the pellets K1 from which impurities are to be removed. The high-frequency sound waves generated by the second high-frequency sound wave generating device 4 are transmitted to the pellets K1 from which impurities are to be removed in the separation cavity 11 using the solid wave-guiding medium as a wave-guiding medium. The sound waves acting on the pellets K1 from which impurities are to be removed can weaken the bonding force between the pellets and the impurities, and the airflow Q generated by the fan can blow the impurities away from the pellets, thereby completely separating the impurities from the pellets and obtaining clean pellets K2.

[0035] In the present invention, the frequency of the low-frequency sound waves generated from the low-frequency sound wave generator 2 is 1 Hz to 350 Hz, for example, 10 Hz to 350 Hz, and the frequency of the high-frequency sound waves generated from the first high-frequency sound wave generator 3 and the second high-frequency sound wave generator 4 is 6 kHz to 40 kHz, for example, 9 kHz and 12 kHz. Preferably, the frequency of the high-frequency sound waves is 6 Hz to 20 Hz.

[0036] When the device of the present invention is in use, only one of the low frequency sound wave generator 2, the first high frequency sound wave generator 3 and the high frequency sound wave solid waveguide module may be turned on to use sound waves of one mode, any two of them may be turned on simultaneously to use sound waves of any two modes simultaneously, or all three of them may be turned on simultaneously to use sound waves of three modes simultaneously.

[0037] In the present invention, the action mechanisms of the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the high-frequency sound wave solid-wave guide module on the pellets from which impurities are to be removed are the same as those of the three modes in embodiment 1 on the pellets from which impurities are to be removed, and therefore will not be repeated.

[0038] In one embodiment, as shown in FIG. 1, the low-frequency sound generating device 2 includes a low-frequency sound generator 21 and a low-frequency sound converter 22 (or called a low-frequency sound energy converter), where the low-frequency sound converter 22 is used to receive a sound signal from the low-frequency sound generator 21 and convert it into a low-frequency sound wave. The low-frequency sound signal generated by the low-frequency sound generator 21 may be generated using electromagnetic oscillation, but may also be generated by methods such as compressed air, mechanical vibration, and piezoelectric materials.

[0039] When the low-frequency sound signal is generated using electromagnetic oscillation, the low-frequency sound generator 21 is electrically connected to the low-frequency sound converter 22. When the low-frequency sound signal is generated using compressed air, the low-frequency sound generator 21 is connected to the low-frequency sound converter 22 by piping.

[0040] In this embodiment, various forms are possible, such as one low-frequency sound converter 22 connected to one low-frequency sound generator 21, multiple low-frequency sound converters 22 connected to one low-frequency sound generator 21, or one or multiple converters connected to a sound generator capable of generating low-frequency sound waves and high-frequency sound waves. The low-frequency sound generator 21 and the low-frequency sound converter 22 may be the same integrated device having both sound wave generation and sound wave conversion functions, or may be two devices having separate sound wave generation and sound wave conversion functions.

[0041] In one embodiment, as shown in FIG. 1, the first high-frequency sound wave generating device 3 includes a first high-frequency sound wave generator 31 and a first high-frequency sound wave converter 32, and the second high-frequency sound wave generating device 4 includes a second high-frequency sound wave generator 41 and a second high-frequency sound wave converter 42, the first high-frequency sound wave generator 31 and the first high-frequency sound wave converter 32 are electrically connected, and the second high-frequency sound wave generator 41 and the second high-frequency sound wave converter 42 are electrically connected, and the high-frequency sound wave converter is used to receive a sound wave signal from the high-frequency sound wave generator and convert it into a high-frequency sound wave, and the high-frequency sound wave signal generated by the high-frequency sound wave generator may be generated using electromagnetic oscillation, but may also be generated by methods such as compressed air, mechanical vibration, and piezoelectric materials. The second high-frequency sonic converter 42 of the second high-frequency sonic generator 4 is mechanically connected to the solid wave-guiding medium, and the sound waves of the second high-frequency sonic converter 42 are transmitted to the solid wave-guiding medium, generating mechanical vibrations in the solid wave-guiding medium, which are then transmitted to the pellets K1 from which impurities are to be removed. For example, the low-frequency sonic converter 22 and the first high-frequency sonic converter 32 are both horns, and the second high-frequency sonic converter 42 is an electromagnetic vibrator or a pneumatic vibrator.

[0042] In this embodiment, various forms are possible, such as one high-frequency sound wave converter connected to one high-frequency sound wave generator, multiple high-frequency sound wave converters connected to one high-frequency sound wave generator, or one or more converters connected to a sound wave generator capable of generating low-frequency sound waves and high-frequency sound waves. The high-frequency sound wave generator and the high-frequency sound wave converter may be the same integrated device having both sound wave generation and sound wave conversion functions, or may be two devices having separate sound wave generation and sound wave conversion functions.

[0043] In the present invention, the low-frequency sound wave generating device 2, the first high-frequency sound wave generating device 3 and the second high-frequency sound wave generating device 4 may be provided outside the housing 1 or within the separation cavity 11, or of course some of them may be provided outside the housing 1 and other parts may be provided within the separation cavity 11, for example, the sound wave generator is provided outside the housing 1 and the sound wave converter is provided within the separation cavity 11, and the separation cavity 11 is filled with low-frequency sound waves and high-frequency sound waves using gas as a wave-guiding medium.

[0044] In the present invention, the frequencies of the sound waves generated by the low-frequency sound wave generator 2, the first high-frequency sound wave generator 3 and the second high-frequency sound wave generator 4 may be fixed, adjustable, or sweep frequency (i.e., automatic frequency conversion), and may be manually changed or automatically adjusted. The amplitude of the sound wave generator may be adjustable or fixed.

[0045] In the present invention, the low-frequency sound generator 21 and the low-frequency sound converter 22 of the low-frequency sound generator 2 may be of an electric or gas type, and may be integrated or separate. The first high-frequency sound generator 31 and the first high-frequency sound converter 32 of the first high-frequency sound generator 3 may be of an electric or gas type, and may be integrated or separate. The second high-frequency sound generator 41 and the second high-frequency sound converter 42 of the second high-frequency sound generator 4 may be of an electric or gas type, and may be integrated or separate.

[0046] In one embodiment, the housing 1 is provided with a pellet inlet 12 and a pellet outlet 13 which are respectively connected to the separation cavity 11, and a drainage device is provided within the separation cavity 11 to guide the pellets K1 from which impurities are to be removed so that they flow within the separation cavity 11, the drainage device is provided between the pellet inlet 12 and the pellet outlet 13, the pellets K1 from which impurities are to be removed enter the separation cavity 11 from the pellet inlet 12, and under the drainage action of the drainage device, the pellets K1 from which impurities are to be removed flow in a dispersed manner rather than in a piled-up manner within the separation cavity 11, thereby improving the effect of the sound waves and airflow on the pellets K1 from which impurities are to be removed, and after the impurities are removed, the clean pellets K2 leave the separation cavity 11 from the pellet outlet 13.

[0047] Regarding the drainage device, there are at least several embodiments as follows.

[0048] In one embodiment, as shown in FIG. 2, the drainage device includes a slide plate 6 that guides the pellets K1 from which impurities are to be removed so that they slide down.

[0049] In another embodiment, the drainage device comprises a flow plate 7 which guides the pellets K1 to be removed so that they slide down.

[0050] In yet another embodiment, the drainage device includes a slide plate 6 and a flow plate 7 that guide the pellets K1 from which impurities are to be removed so that they slide down, and the flow plate 7 is located below the slide plate 6.

[0051] In the first feasible technical proposal, the slide plate 6 has an inverted V-shaped structure formed by connecting two symmetrically arranged first slide plate 61 and second slide plate 62, that is, the first slide plate 61 and the second slide plate 62 are inclined, with their upper ends connected and their lower ends spaced apart, the pellet inlet 12, the slide plate 6 and the pellet outlet 13 are arranged correspondingly from top to bottom, the pellet inlet 12 faces the upper end of the slide plate 6, and the pellet K1 to be removed from impurities can fall to the upper end of the slide plate 6, and the pellet K1 to be removed from impurities is divided into two parts from the upper end of the slide plate 6 and slides downward along the first slide plate 61 and the second slide plate 62 respectively.

[0052] The working process is as follows: the pellets K1 to be removed from the impurities enter the separation cavity 11 through the pellet inlet 12, fall to the upper end of the slide plate 6, and then split into two parts and slide downward along the first slide plate 61 and the second slide plate 62, respectively; at the same time, the sound waves from at least one of the low-frequency sound wave generator 2, the first high-frequency sound wave generator 3, and the high-frequency sound solid wave guide module act on the pellets K1 to be removed from the impurities, weakening or even eliminating the binding force between the pellets and impurities; at the same time, the airflow Q generated by the fan is blown onto the pellets to be removed from the impurities, the wind airflow blows the impurities off the pellets, and the clean pellets K1 fall from the pellet outlet 13, and the wind airflow carries the solid impurities to be discharged from the separation cavity 11, thereby achieving complete separation between the impurities and the pellets.

[0053] In this embodiment, by providing a first slide plate 61 and a second slide plate 62, the pellets from which impurities are to be removed can be guided so that they slide downward within the separation cavity 11, and the time that the pellets from which impurities are to be removed remain inside the separation cavity 11 can be extended, thereby further improving the impurity removal effect.

[0054] In this embodiment, as shown in FIG. 2, the drainage device further includes two fluid plates 7, the fluid plates 7 have air holes densely distributed therein, the two fluid plates 7 are respectively located below the first slide plate 61 and below the second slide plate 62, and are respectively directed toward the first slide plate 61 and the second slide plate 62, the two fluid plates 7 are inclined toward each other from top to bottom, and the pellet outlet 13 is located between the lower ends of the two fluid plates 7, therefore, the pellets K1 to be removed from impurities first slide downward along the first slide plate 61 and the second slide plate 62, then fall onto the two fluid plates 7, and then slide along the two fluid plates 7 to the pellet outlet 13, and the clean pellets K2 fall from the pellet outlet 13.

[0055] In this embodiment, at least one of the slide plate 6 and the flow plate 7 is connected to the second high frequency sound wave generator 4 as a solid wave-guiding medium, so that the slide plate 6 and / or the flow plate 7 guide the pellets to slide down and transmit the sound waves to the pellets to be removed from. The flow plate 7 also functions as a receiving device to collect the clean pellets.

[0056] Here, the overall shape of the first slide plate 61 may be a flat plate (as shown in Figure 2), an inwardly concave arc plate (as shown in Figures 6, 7, 14, and 15), or an outwardly convex arc plate (as shown in Figures 10 and 11), and the overall shape of the second slide plate 62 may be a flat plate (as shown in Figure 2), an inwardly concave arc plate (as shown in Figures 6, 7, 14, and 15), or an outwardly convex arc plate (as shown in Figures 10 and 11).

[0057] 2, 3 and 4, the first sliding plate 61 and the second sliding plate 62 have the same structure, and both have a stepped plate structure. The first sliding plate 61 is taken as an example, and the first sliding plate 61 is composed of a plurality of alternating vertical plates 611 and a plurality of inclined plates 612 connected in sequence, and the angle between the inclined plates 612 and the vertical plate 611 is greater than 90° and less than 180°. The vertical plate 611 here rapidly drops the pellets K1 from which impurities are to be removed, and exerts a fluid acceleration effect on the pellets K1 from which impurities are to be removed, and generates vibrations when the pellets K1 from which impurities are to be removed fall onto the inclined plate 612, contributing to the separation of the impurities and the pellets, and the inclined plate 612 guides the pellets K1 from which impurities are to be removed to slide downward.

[0058] Furthermore, as shown in FIG. 5, the vertical plate 611 has densely distributed through-holes 613 through which the airflow passes.

[0059] In the second possible technical solution, the sliding plate 6 is a substantially C-shaped plate (as shown in FIG. 20 and FIG. 21 ), and both ends of the sliding plate 6 are fixed to the side walls of the housing 1 .

[0060] In this embodiment, the structure of the slide plate 6 may be the same as the structures of the first slide plate 61 and the second slide plate 62 in the first embodiment, and is a stepped plate structure.

[0061] In this embodiment, the drainage device may further include a flow plate 7 (as shown in Figures 20 and 21), which is located below the slide plate 6 and is used to catch the pellets that fall from the slide plate 6.

[0062] In a third possible technical solution, the sliding plate 6 is a substantially conical cylinder (as shown in Figures 8, 9, 12, 13, 16 and 17), and the generating line of the conical cylinder is an inwardly concave arc line (as shown in Figures 8, 9, 16 and 17) or an outwardly convex arc line (as shown in Figures 12 and 13).

[0063] In this embodiment, the structure of the slide plate 6 may be the same as the structures of the first slide plate 61 and the second slide plate 62 in the first embodiment, and is a stepped plate structure.

[0064] In this embodiment, the drainage device may further include two flow plates 7, which are located below the slide plate 6 and are used to catch the pellets that fall from the slide plate 6.

[0065] In the fourth possible technical solution, the slide plate 6 is a roughly S-shaped plate (as shown in Fig. 18 and Fig. 19), resembling a curved slide.

[0066] In this embodiment, the structure of the slide plate 6 may be the same as the structures of the first slide plate 61 and the second slide plate 62 in the first embodiment, and is a stepped plate structure.

[0067] In this embodiment, the drainage device may further include a flow plate 7, which is located below the slide plate 6 and is used to catch the pellets that fall from the slide plate 6. In a fifth possible technical solution, the slide plate 6 is a hemispherical plate, and the pellets to be removed from the impurities slide down along the spherical surface of the hemispherical plate.

[0068] In the sixth possible technical solution, the slide plate 6 is a semi-elliptical spherical plate, and the pellets to be removed from the impurities slide down along the elliptical surface of the semi-elliptical spherical plate.

[0069] However, the present invention is not limited thereto, and in other embodiments, the drainage device may further include one or more combinations of an acceleration plate, a screen plate, a screen, an aeration plate, a distribution device, a spray pipe, an injection pipe, a centrifugal device, a punch hole, and a cyclone, as long as the drainage device can scatter the pellets to be removed from impurities and avoid accumulation.

[0070] In one embodiment, as shown in FIG. 2, a distribution device 5 is provided at the pellet inlet 12, and the distribution device 5 scatters the pellets K1 from which impurities are to be removed into the drainage device, distributing the pellets K1 from which impurities are to be removed in a dispersed manner in the drainage device, so that the distribution method (e.g., uniformity, retention, etc.) can be adjusted.

[0071] Regarding the distribution method, a distribution reference line O is defined, and the distribution may be on one side of the distribution reference line O (as shown in Figures 20 and 21), on both sides of the distribution reference line O (as shown in Figures 23 and 24), or in a circumferential direction of the distribution reference line O (as shown in Figures 25, 26, and 28).

[0072] Regarding the distribution device 5, there are at least several embodiments as follows.

[0073] In the first specific embodiment, the pellet inlet 12, the distribution device 5, the drainage device and the pellet outlet 13 are all arranged on one side of the distribution reference line O, the distribution reference line O is located on the side wall of the housing 1, the distribution device 5 is a straight body (not shown), an inclined plate (as shown in FIG. 29), or the distribution device 5 is an inclined housing (as shown in FIG. 21 and FIG. 22) inclined from top to bottom in a direction away from the distribution reference line O, and in the examples of FIG. 21 and FIG. 22, the cross section of the inclined housing is rectangular. The distribution method of this embodiment is one-sided distribution, and is suitable for use in combination with the drainage device of the second technical solution or the drainage device of the fourth technical solution.

[0074] In this embodiment, the drainage device may include a slide plate 6 (as shown in Figures 20 and 21), may not include a slide plate 6 (as shown in Figure 29), may include a flow plate 7 (as shown in Figures 20, 21 and 29), or may not include a flow plate 7.

[0075] In a second specific embodiment, as shown in Figures 23 to 27, the distribution reference line O is the center line of the housing 1, and the distribution reference line O is the symmetrical axis of the drainage device. The distribution method of this embodiment distributes on both sides or in the circumferential direction of the distribution reference line O, and is suitable for use in combination with the drainage device of the first technical solution or the drainage device of the third technical solution described above.

[0076] In the first feasible technical solution of this embodiment, as shown in Figures 23 and 24, the distribution device 5 includes two feeders 51, which are located on opposite sides of the distribution reference line O, and the cross section of the feeders 51 is rectangular, and the two feeders 51 are inclined away from each other in the direction approaching the drainage device, and the lower outlets of the two feeders 51 are rectangular gaps, and the pellets K1 to be removed from the two feeders 51 flow out and fall into the drainage device. The distribution method of this embodiment can be called a multi-gap distribution method.

[0077] In this embodiment, the drainage device may include a sliding plate 6 (as shown in FIG. 23), may not include a sliding plate 6 (as shown in FIGS. 31 and 32), may include a flow plate 7 (FIGS. 23 and 31), or may not include a flow plate 7.

[0078] In the second feasible technical solution of this embodiment, as shown in Figure 25, the distribution device 5 is a conical cylinder, the distribution reference line O is the central axis of the conical cylinder, the diameter of the main body of the conical cylinder gradually decreases in the direction approaching the drainage device, the diameter of the outlet of the conical cylinder gradually increases, and of course the entire conical cylinder may gradually increase from top to bottom (as shown in Figure 30), and the pellets K1 to be removed from impurities flow inside the conical cylinder and fall into the drainage device. The distribution method of this embodiment can be called a conical distribution method.

[0079] In this embodiment, the drainage device may include a sliding plate 6 (as shown in FIG. 25), may not include a sliding plate 6 (as shown in FIG. 30), may include a flow plate 7 (FIGS. 25, 30), or may not include a flow plate 7.

[0080] In the third feasible technical solution of this embodiment, as shown in Figures 26 and 27, the distribution device 5 is composed of two concentric conical cylinders fitted with a gap between them, the distribution reference line O is the central axis of the two conical cylinders, the diameter of the two conical cylinders gradually increases in the direction toward the drainage device, the gap between the two conical cylinders is an annular gap, and the pellets K1 to be removed from the impurities flow through the annular gap between the two conical cylinders and fall into the drainage device. The distribution method of this embodiment can be called an annular distribution method.

[0081] In this embodiment, the drainage device may include a sliding plate 6 (as shown in FIG. 26), may not include a sliding plate 6 (as shown in FIGS. 33, 34), may include a flow plate 7 (FIGS. 26, 33), or may not include a flow plate 7.

[0082] In the above three technical proposals of this embodiment, the pellet inlet 12 is all located above the drainage device, that is, the distribution device 5 is located above the drainage device, and the aforementioned "direction approaching the drainage device" is from top to bottom.

[0083] In some of the above embodiments, if no sliding plate 6 is provided, then the second high frequency sonic transducer 42 may be provided on the distribution device 5 (as shown in Figures 29 to 34).

[0084] However, the invention is not limited thereto and the second high frequency acoustic wave generator can also be connected to another solid material that comes into contact with the particles in the separation cavity 11 .

[0085] In a third specific embodiment, as shown in FIG. 28, the distribution reference line O is the center line of the housing 1, the drainage device includes a slide plate 6, the distribution reference line O is the symmetric axis of the slide plate 6, the pellet inlet 12 is located below the slide plate 6 and is located on one side of the distribution reference line O, the distribution device 5 is a curved tube, the curved tube extends from the pellet inlet 12 diagonally upward toward the distribution reference line O, and after extending to the center of the bottom of the slide plate 6, it penetrates the slide plate 6 upward along the distribution reference line O and extends to the top of the slide plate 6, and the pellets K1 to be removed from the impurities flow upward in the curved tube, fall to the top of the slide plate 6 after jumping out of the curved tube, and then slide downward along the slide plate 6. The distribution method of this embodiment can be called a washing distribution method. In this embodiment, the slide plate 6 may be a conical cylinder, a hemispherical plate, or a semi-elliptical spherical plate. The drainage device may not include the flow plate 7, and may instead use an inverted cone-shaped inner wall at the bottom of the housing 1 to guide the pellets to slide down to the pellet outlet 13.

[0086] In one embodiment, the pellet outlet 13 is provided with a receiving device for collecting the clean pellets K2, which are collected and then flow out of the pellet outlet 13. For example, the receiving device is a hopper-like structure.

[0087] In one embodiment, the housing 1 is provided with an inlet 14 and an outlet 15 each communicating with the separation cavity 11, and the inlet 14 and / or the outlet 15 are provided with a fan, i.e., the inlet 14 is provided with a blower and / or the outlet 15 is provided with an induced draft fan, so that the air flow can carry impurities and discharge them from the outlet 15.

[0088] Furthermore, as shown in FIG. 1, the pellet inlet 12, the pellet outlet 13, the air intake 14 and the air exhaust 15 are provided with valves 8 for easy operation and control.

[0089] In one embodiment, the device may also include at least one, for example any two, three, or four, of a plasma generator, a microwave generator, an infrared generator, and a dry ice inlet. Here, the plasma generator is used to apply plasma to the pellets from which impurities are to be removed, the microwave generator is used to apply microwaves to the pellets from which impurities are to be removed, the infrared generator is used to apply infrared rays to the pellets from which impurities are to be removed, and the dry ice inlet is used to inject dry ice into the pellets from which impurities are to be removed, thereby further improving the effect of removing impurities. In this embodiment, The plasma generator, the microwave generator and the infrared generator may be provided inside the housing 1, and the dry ice inlet may be provided in the shell wall of the housing 1. EMBODIMENT 3

[0090] As shown in FIG. 1, the present invention further provides an apparatus for removing impurities in pellets, the apparatus including a housing 1 having a separation cavity 11 therein, and further including at least one of a low-frequency sound wave generator 2, a first high-frequency sound wave generator 3 and a high-frequency sound solid-wave guide module, and a blower for introducing an air flow Q into the separation cavity 11 and / or an induced draft blower for guiding the air flow Q. The low-frequency sound waves generated from the low-frequency sound generator 2 and the high-frequency sound waves generated from the first high-frequency sound generator 3 can be transmitted to the pellets in the separation cavity 11 from which impurities are to be removed, using the gas in the separation cavity 11 as a wave-guiding medium. The high-frequency sound solid-wave-guiding module includes a connected second high-frequency sound generator 4 and a solid wave-guiding medium, which is provided in the separation cavity 11 and must be located on the required path of the pellets K1 from which impurities are to be removed. The high-frequency sound waves generated from the second high-frequency sound generator 4 are transmitted to the pellets K1 from which impurities are to be removed in the separation cavity 11, using the solid wave-guiding medium as a wave-guiding medium. The low-frequency sound waves and / or high-frequency sound waves acting on the pellets K1 from which impurities are to be removed can weaken the bonding force between the pellets and impurities in the pellets K1 from which impurities are to be removed. The airflow Q generated by the fan can blow away the impurities from the pellets, thereby completely separating the impurities from the pellets and obtaining clean pellets K2.

[0091] The other structure and operation principle of the device in this embodiment are the same as those of the device for removing impurities in pellets described in embodiment 2, so they will not be repeated.

[0092] The method and apparatus of the present invention utilize the characteristics of different frequency bands of sound waves, organically combine low-frequency sound waves and high-frequency sound waves, and organically combine gas-guided waves and solid-guided waves, to weaken the bonding force between pellets and impurities attached to their surfaces, and thus remove them, creating a gap or separation effect between the two. Furthermore, the pellets and impurities that have been freed from the bonding force by the combined wind-force airflow are further separated and sent downstream respectively, thereby realizing efficient separation of the pellets and impurities and achieving the purpose of highly purifying the pellets.

[0093] The present invention solves the difficulties and key points in pellet purification, namely, it converts the adherent impurities attached to the pellet surface by binding forces such as electromagnetic force, liquid bridging force, van der Waals force, etc. into dispersed impurities, thereby effectively separating the adherent impurities and dramatically improving the pellet purification efficiency. Tests have shown that under the same operating conditions, the present invention can improve the pellet cleanliness value by an average of 10PPM or more. The present invention has low investment costs, is safe and reliable, environmentally friendly, stable in operation, easy to implement, and easy to modify and upgrade equipment with outdated technology and low purification efficiency, with small investment and remarkable effects.

[0094] The method and apparatus of the present invention may be combined with other methods for removing or separating the binding forces between the pellets and impurities, such as electromagnetic fields, ionic wind, screen plates, fluidized beds, impact plates, scrubbers, blowing, electrostatic, mechanical, screens, and other methods or devices for removing impurities.

[0095] The method and apparatus of the present invention provides for the separation of pellets and impurities, which in turn provides for the collection of impurities of the powder or particulate type, which corresponds to the rejection of larger powders or particulates.

[0096] The above are merely illustrative specific embodiments of the present invention, and do not limit the scope of the present invention. Equivalent modifications and amendments made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the scope of protection of the present invention. It should be noted that each component of the present invention is not limited to the above-mentioned overall application, and each technical feature described in the specification of the present invention can be selected and adopted alone or multiple combinations can be selected and used according to actual needs, so the present invention naturally covers other combinations and specific applications related to the inventive aspects of the present invention.

Claims

1. A method for removing impurities in pellets, comprising: adopting at least one of a low frequency acoustic gas-guided mode, a high frequency acoustic gas-guided mode, and a high frequency acoustic solid-guided mode; transmitting sound waves to the pellets to be removed from, thereby weakening the bonding force between the pellets and the impurities in the pellets to be removed from, and at the same time, employing airflow to strengthen the separation between the impurities and the pellets; The low-frequency acoustic gas guided mode is a mode in which low-frequency acoustic waves are transmitted through gas as a guide medium. can be, The high-frequency acoustic gas-guiding mode is a mode in which high-frequency acoustic waves are transmitted through gas as a guiding medium; The step of transmitting the sound wave to the pellets to be removed from impurities by adopting at least one of a low frequency sound gas wave guided mode, a high frequency sound gas wave guided mode, and a high frequency sound solid wave guided mode includes the step of: A method for removing impurities in pellets, comprising a step of transmitting acoustic waves to the pellets from which impurities are to be removed by employing at least one of a low frequency acoustic gas-wave-guided mode, a high frequency acoustic gas-wave-guided mode, and a high frequency acoustic solid-wave-guided mode while applying at least one of plasma, microwaves, infrared rays, and dry ice to the pellets from which impurities are to be removed.

2. The step of transmitting the acoustic waves to the pellets to be removed by adopting at least one of a low frequency acoustic gas guided mode, a high frequency acoustic gas guided mode, and a high frequency acoustic solid guided mode, comprises:

2. The method for removing impurities in pellets as described in claim 1, characterized in that it includes a step of transmitting acoustic waves to the pellets from which impurities are to be removed by employing at least two of a low frequency sonic gas-wave-guided mode, a high frequency sonic gas-wave-guided mode, and a high frequency sonic solid-wave-guided mode.

3. The frequency of the infrasonic waves in the infrasonic gas-guided mode is one frequency or a combination of multiple frequencies; The frequency of the high frequency acoustic wave in the high frequency acoustic gas-guided mode is one frequency or a combination of multiple frequencies; The frequency of the high frequency acoustic wave in the high frequency acoustic solid guided mode may be one or more frequencies. The method for removing impurities in the pellets according to claim 1 is characterized in that How to remove it.

4. The waveform of the low frequency acoustic wave in the low frequency acoustic gas guided mode is one waveform or a combination of multiple waveforms; The waveform of the high frequency acoustic wave in the high frequency acoustic gas-guiding mode is one waveform or a combination of multiple waveforms; 2. The method for removing impurities in pellets according to claim 1, wherein the waveform of the high frequency sound wave in the high frequency sound solid guided wave mode is one waveform or a combination of multiple waveforms.

5. the amplitude of the low frequency acoustic waves in the low frequency acoustic gas guided mode is one amplitude or a combination of amplitudes; The amplitude of the high frequency acoustic wave in the high frequency acoustic gas-guided mode is one amplitude or a combination of amplitudes; 2. The method for removing impurities in pellets according to claim 1, wherein the amplitude of the high frequency acoustic wave in the high frequency acoustic solid guided wave mode is one amplitude or a combination of multiple amplitudes.

6. The method for removing impurities in pellets according to any one of claims 1 to 5, characterized in that the frequency of the low frequency sound waves is between 1 Hz and 350 Hz, and the frequency of the high frequency sound waves is between 6 kHz and 40 kHz.

7. The step of transmitting the acoustic waves to the pellets to be removed by adopting at least one of a low frequency acoustic gas guided mode, a high frequency acoustic gas guided mode, and a high frequency acoustic solid guided mode, comprises: A method for removing impurities in pellets according to any one of claims 1 to 5, characterized in that it includes a step of transmitting acoustic waves to the pellets from which impurities are to be removed by adopting at least one of a low frequency acoustic gas-wave-guided mode, a high frequency acoustic gas-wave-guided mode and a high frequency acoustic solid-wave-guided mode while the pellets from which impurities are to be removed are in a flowing state.

8. An apparatus for removing impurities in pellets, the apparatus being used in the method for removing impurities in pellets according to any one of claims 1 to 7, the apparatus comprising a housing having a separation cavity, and a blower for introducing an air flow into the separation cavity and / or an induced draft blower for guiding the air flow, the apparatus further comprising at least one of a low frequency acoustic generator, a first high frequency acoustic generator and a high frequency acoustic solid-wave guide module, the operation mode of the low frequency acoustic generator being the low frequency acoustic gas-wave guide mode, the operation mode of the first high frequency acoustic generator being the high frequency acoustic gas-wave guide mode, the operation mode of the high frequency acoustic solid-wave guide module being the high frequency acoustic solid-wave guide mode, the high frequency acoustic solid-wave guide module comprising a second high frequency acoustic generator and a solid wave-guiding medium connected thereto, the apparatus further comprising at least one of a plasma generator, a microwave generator, an infrared generator and a dry ice inlet.

9. The apparatus for removing impurities in pellets as described in claim 8, characterized in that the housing is provided with a pellet inlet and a pellet outlet each communicating with the separation cavity, a drainage device is provided within the separation cavity to guide the pellets from which the impurities are to be removed so that they flow in a dispersed manner within the separation cavity, and the drainage device is provided between the pellet inlet and the pellet outlet.

10. 10. The apparatus for removing impurities in pellets according to claim 9, wherein at least a portion of the drainage device is connected to the second high-frequency acoustic wave generator as the solid wave-guiding medium.

11. The apparatus for removing impurities in pellets according to claim 9, further comprising a distribution device provided at the pellet inlet, the distribution device distributing the pellets from which the impurities are to be removed to the drainage device.

12. 12. The apparatus for removing impurities in pellets according to claim 11, wherein the distribution device is connected to the second high frequency sound wave generating device as the solid wave guiding medium.

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