Lithium carbonate circulating grinding device

Abstract

The utility model relates to the technical field of lithium carbonate production equipment, and provides a lithium carbonate circulating grinding device which comprises a shell. The grinding mechanism is rotationally arranged at the upper part in the shell and is used for grinding lithium carbonate; the screening mechanism is arranged in the middle of the interior of the shell and used for screening the lithium carbonate with the coarse particle size and the lithium carbonate with the fine particle size; and the lifting mechanism is fixedly arranged on the outer side of the shell and is used for lifting the coarse-particle-size lithium carbonate into the shell so as to realize circulating grinding. By means of the screening mechanism and the lifting mechanism, coarse-particle-size lithium carbonate which does not meet the requirement can be screened out and automatically fed back, regrinding is achieved, the grinding effect is improved, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium carbonate production equipment, in particular to a lithium carbonate circulation grinding device. Background Art

[0002] Lithium carbonate is an inorganic compound with the chemical formula Li2CO3 and a molecular weight of 73.89. It occurs as colorless monoclinic crystals and is slightly soluble in water and dilute acid, but insoluble in ethanol and acetone. Lithium carbonate has a wide range of applications, including as a raw material for the manufacture of ceramics, pharmaceuticals, catalysts, and lithium batteries.

[0003] The main raw material for producing lithium carbonate is salt lake brine. During the production process of lithium carbonate, the lithium carbonate must be ground to turn the crystalline lithium carbonate into powder for easy use.

[0004] At present, the existing grinding device has a poor grinding effect on lithium carbonate and is unable to timely screen out lithium carbonate with particle size that does not meet the requirements from the ground lithium carbonate. Moreover, when lithium carbonate with particle size that does not meet the requirements appears, it needs to be poured back into the grinding device for re-grinding, which seriously reduces work efficiency. Utility Model Content

[0005] In response to the shortcomings of the existing technology, the utility model provides a lithium carbonate circulating grinding device to solve the problem that the grinding device in the existing technology has a poor grinding effect on lithium carbonate, cannot timely screen out lithium carbonate with a particle size that does not meet the requirements from the ground lithium carbonate, and when lithium carbonate with a particle size that does not meet the requirements appears, it needs to be poured back into the grinding device for re-grinding, which seriously reduces work efficiency.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] A lithium carbonate circulation grinding device, comprising:

[0008] case;

[0009] A grinding mechanism, rotatably disposed in the upper portion of the housing, for grinding lithium carbonate;

[0010] A screening mechanism is provided in the middle of the housing and is used to screen coarse-grained lithium carbonate and fine-grained lithium carbonate; and

[0011] The lifting mechanism is fixedly arranged on the outside of the shell and is used to lift the coarse-grained lithium carbonate into the shell to achieve cyclic grinding.

[0012] Optionally, the shell includes a feed hopper, a first straight cylinder section, a conical cylinder section, a second straight cylinder section and a discharge hopper which are sequentially arranged in the upper and lower parts;

[0013] The grinding mechanism includes a first motor and a grinding cone, wherein the first motor is fixedly mounted on the middle portion of the top cover of the feed hopper, the grinding cone is fixedly connected to the first motor output shaft extending into the interior of the feed hopper, and a grinding channel is provided between the grinding cone and the feed hopper;

[0014] The screening mechanism is located inside the conical cylinder section and the second straight cylinder section and is coaxial with the grinding cone;

[0015] The bottom of the hopper is provided with a discharge port for discharging fine-particle lithium carbonate to the receiving barrel;

[0016] The inlet of the lifting mechanism is communicated with the pipe opening opened on the side wall of the second straight cylinder section through a first inclined pipe, and the outlet is communicated with the return port opened on the top cover through a second inclined pipe.

[0017] Optionally, the grinding cone includes an upper cone and a lower cone with large ends butted together;

[0018] The feeding area is between the outer conical surface of the upper cone and the inner conical surface on the upper side of the feed hopper;

[0019] A grinding channel with an inverted eight-shaped structure in longitudinal section is formed between the outer conical surface of the lower cone and the inner conical surface at the lower side of the feed hopper.

[0020] Optionally, the grinding channel has a large inlet gap and a small outlet gap.

[0021] Optionally, the outer conical surface of the lower cone is provided with a plurality of evenly distributed grinding bars along its generatrix direction for squeezing and crushing lithium carbonate.

[0022] Optionally, the grinding bars have two specifications, one long and one short, which are spaced apart from each other and the long one is thinner and the short one is thicker.

[0023] Optionally, the grinding cone is provided with a transmission shaft passing through the upper cone cylinder and the lower cone cylinder, and the upper end of the transmission shaft is fixedly connected to the output shaft of the first motor;

[0024] The screening mechanism includes a scraper and a screen plate, wherein the scraper is threadedly connected to the lower end of the transmission shaft to rotate coaxially therewith and is used to scrape the screen plate;

[0025] The sieve plate is elastically connected to the inner side wall of the second straight cylinder section, and the edge of the sieve plate is 1 to 2 mm higher than the pipe opening opened on the side wall of the second straight cylinder section.

[0026] Optionally, the transmission shaft is a hollow shaft.

[0027] Optionally, the lifting mechanism is a bucket elevator.

[0028] Optionally, four circumferentially evenly distributed supporting legs are connected to the outer conical surface of the discharge hopper to support the entire shell on the ground.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] 1. Through the screening mechanism and lifting mechanism, the coarse-particle lithium carbonate that does not meet the requirements can be screened out and automatically fed back for re-grinding, which improves the grinding effect and greatly improves work efficiency.

[0031] 2. Two grinding bars of different specifications can produce different degrees of periodic squeezing on the lithium carbonate entering the grinding channel, thereby improving the grinding effect of lithium carbonate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0033] Figure 1 It is a structural diagram of the utility model;

[0034] Figure 2 Schematic diagram of the structure of the grinding cone;

[0035] Figure 3 for Figure 1 Schematic diagram of the enlarged structure of part A in the middle. DETAILED DESCRIPTION

[0036] Hereinafter, only certain exemplary embodiments are briefly described. As will be appreciated by those skilled in the art, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are to be regarded as illustrative in nature and not restrictive.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention 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 should not be understood as a limitation on the present invention.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0039] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0040] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0041] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention.

[0042] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0043] See also Figures 1 to 3 As shown, the utility model provides a lithium carbonate circulation grinding device, comprising:

[0044] Housing 100;

[0045] The grinding mechanism 200 is rotatably disposed in the upper portion of the housing 100 and is used to grind lithium carbonate;

[0046] The screening mechanism 300 is provided in the middle of the housing 100 and is used to screen the coarse-grained lithium carbonate and the fine-grained lithium carbonate; and

[0047] The lifting mechanism 400 is fixedly arranged on the outside of the shell 100 and is used to lift the coarse-grained lithium carbonate into the shell 100 to achieve cyclic grinding.

[0048] Specifically, the housing 100 includes a feed hopper 110, a first straight cylinder section 120, a conical cylinder section 130, a second straight cylinder section 140 and a discharge hopper 150 arranged in sequence from top to bottom; the grinding mechanism 200 includes a first motor 210 and a grinding cone 220, the first motor 210 is fixedly mounted on the middle of the top cover 111 of the feed hopper 110, the grinding cone 220 is fixedly connected to the output shaft of the first motor 210 extending into the interior of the feed hopper 110, and the grinding cone 220 is fixedly connected to the feed hopper 110. A grinding channel is provided between the two sections; the screening mechanism 300 is located inside the conical section 130 and the second straight section 140, and is coaxial with the grinding cone 220; a discharge port 151 is provided at the bottom of the discharge hopper 150 for discharging fine-particle lithium carbonate to a receiving barrel (not shown in the figure); the inlet of the lifting mechanism 400 is connected to the pipe port opened on the side wall of the second straight section 140 through the first inclined ditch tube 410, and the outlet is connected to the return port 112 opened on the top cover 111 through the second inclined ditch tube 420. During operation, the first motor 210 is started to drive the grinding cone 220 to rotate, and the lithium carbonate to be ground is poured into the feed hopper 110 from the feeding port 113 on the top cover 111 of the feed hopper 110. As the grinding cone 220 rotates, the lithium carbonate enters the grinding channel and is ground and refined into coarse-grained lithium carbonate and fine-grained lithium carbonate. After leaving the grinding channel, they are guided by the first straight cylinder section 120 to reach the screening mechanism 300. The coarse-grained lithium carbonate that does not meet the requirements enters the lifting mechanism 400 through the first inclined tube 410 under the action of the screening mechanism 300 for lifting, and then returns to the feed hopper 110 from the second inclined tube 420 to participate in grinding again. The fine-grained lithium carbonate that meets the requirements falls into the discharge hopper 150 through the screening mechanism 300, and is discharged to the receiving barrel through the discharge port 151 for use in the next process. That is to say, through the screening mechanism 300 and the lifting mechanism 400, the coarse-particle lithium carbonate that does not meet the requirements can be screened out and automatically returned to achieve re-grinding, thereby improving the grinding effect and greatly improving work efficiency.

[0049] See also Figure 2 As shown, the grinding cone 220 includes an upper cone 221 and a lower cone 222 connected together at the large ends. The feeding area is between the outer cone surface of the upper cone 221 and the inner cone surface on the upper side of the feed hopper 110, and the grinding channel with an inverted eight-shaped structure in the longitudinal section is between the outer cone surface of the lower cone 222 and the inner cone surface on the lower side of the feed hopper 110.

[0050] To facilitate the entry of the lithium carbonate to be ground into the grinding channel, the gap at the inlet (i.e., the upper side) of the grinding channel is large, while the gap at the outlet (i.e., the lower side) is small. Specifically, the taper of the lower cone 222 is smaller than that of the feed hopper 110. For example, the cone top angle of the lower cone 222 is 88°, while the cone top angle of the feed hopper 110 is 90°.

[0051] The outer conical surface of the lower cone 222 is provided with a plurality of evenly distributed grinding bars 223 along its generatrix direction for squeezing and crushing lithium carbonate.

[0052] The grinding bars 223 are provided in two sizes, one long and one short, spaced apart from each other, with the long one being thinner and the short one being thicker. Thus, the two different sizes of grinding bars 223 can produce varying degrees of periodic compression on the lithium carbonate entering the grinding channel, thereby improving the grinding effect of the lithium carbonate.

[0053] The grinding cone 220 is provided with a transmission shaft 224 that passes through the upper cone 221 and the lower cone 222. The upper end of the transmission shaft 224 is fixedly connected to the output shaft of the first motor 210; Figure 3 As shown, the screening mechanism 300 includes a scraper 310 and a sieve plate 320. The scraper 310 is threadedly connected to the lower end of the transmission shaft 224 so as to rotate coaxially therewith and is used to scrape the sieve plate 320. The sieve plate 320 is elastically connected to the inner wall of the second straight cylinder section 140, and the edge of the sieve plate 320 is 1 to 2 mm higher than the pipe opening opened on the side wall of the second straight cylinder section 140. The first motor 210 rotates, driving the transmission shaft 224 and the scraper 310 to rotate coaxially. The scraping of the scraper 310 causes the sieve plate 320 to vibrate, thereby screening the coarse-grained lithium carbonate and the fine-grained lithium carbonate falling on the sieve plate 320. The fine-grained lithium carbonate that meets the requirements passes through the sieve plate 320 and falls into the discharge hopper 150, while the coarse-grained lithium carbonate that does not meet the requirements remains on the sieve plate 320. At the same time, due to the scraping of the scraper 310, the coarse-grained lithium carbonate generates centrifugal force and is thrown out, and finally enters the lifting mechanism 400 through the first inclined tube 410, and is returned to the feed hopper 110 under the lifting action of the latter to participate in grinding again.

[0054] In addition, in order to reduce the operating load of the first motor 210 , the transmission shaft 224 is a hollow shaft.

[0055] In this embodiment, the lifting mechanism 400 is preferably a bucket elevator. Specifically, the bucket elevator includes a housing 430 and a second motor 440. The housing 430 is fixed to the ground. The second motor 440 is mounted on the upper portion of the housing 430 and drives a plurality of hoppers to circulate through a traction chain installed inside the housing 430, thereby lifting the incoming material from the first inclined tube 410 to the second inclined tube 420 for discharge.

[0056] See also Figure 1 As shown, four supporting legs 160 evenly distributed around the circumference are connected to the outer conical surface of the discharge hopper 150 to support the entire shell 100 on the ground.

[0057] The above embodiments are only preferred embodiments of the present invention and are not limitations on the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A lithium carbonate circulation grinding device, characterized in that: include: case; A grinding mechanism, rotatably disposed in the upper portion of the housing, for grinding lithium carbonate; A screening mechanism is provided in the middle of the housing and is used for screening coarse-grained lithium carbonate and fine-grained lithium carbonate; and The lifting mechanism is fixedly arranged on the outside of the shell and is used to lift the coarse-grained lithium carbonate into the shell to achieve cyclic grinding.

2. The lithium carbonate circulation grinding device according to claim 1, characterized in that: The shell includes a feed hopper, a first straight cylinder section, a conical cylinder section, a second straight cylinder section and a discharge hopper which are arranged in sequence up and down; The grinding mechanism includes a first motor and a grinding cone, wherein the first motor is fixedly mounted on the middle portion of the top cover of the feed hopper, the grinding cone is fixedly connected to the first motor output shaft extending into the interior of the feed hopper, and a grinding channel is provided between the grinding cone and the feed hopper; The screening mechanism is located inside the conical cylinder section and the second straight cylinder section and is coaxial with the grinding cone; The bottom of the hopper is provided with a discharge port for discharging fine-particle lithium carbonate to the receiving barrel; The inlet of the lifting mechanism is communicated with the pipe opening opened on the side wall of the second straight cylinder section through a first inclined pipe, and the outlet is communicated with the return port opened on the top cover through a second inclined pipe.

3. The lithium carbonate circulation grinding device according to claim 2, characterized in that: The grinding cone includes an upper cone and a lower cone with large ends butted together; The feeding area is between the outer conical surface of the upper cone and the inner conical surface on the upper side of the feed hopper; A grinding channel with an inverted eight-shaped structure in longitudinal section is formed between the outer conical surface of the lower cone and the inner conical surface at the lower side of the feed hopper.

4. The lithium carbonate circulation grinding device according to claim 2 or 3, characterized in that The grinding channel has a large inlet gap and a small outlet gap.

5. The lithium carbonate circulation grinding device according to claim 3, characterized in that: The outer conical surface of the lower cone is provided with a plurality of evenly distributed grinding bars along the generatrix direction thereof, which are used for squeezing and crushing lithium carbonate.

6. The lithium carbonate circulation grinding device according to claim 5, characterized in that: The grinding bars have two specifications, one long and one short. They are spaced apart from each other, with the long one being thinner and the short one being thicker.

7. The lithium carbonate circulation grinding device according to claim 5 or 6, characterized in that: The grinding cone is provided with a transmission shaft passing through the upper cone cylinder and the lower cone cylinder, and the upper end of the transmission shaft is fixedly connected to the output shaft of the first motor; The screening mechanism includes a scraper and a screen plate, wherein the scraper is threadedly connected to the lower end of the transmission shaft to rotate coaxially therewith and is used to scrape the screen plate; The sieve plate is elastically connected to the inner side wall of the second straight cylinder section, and the edge of the sieve plate is 1 to 2 mm higher than the pipe opening opened on the side wall of the second straight cylinder section.

8. The lithium carbonate circulation grinding device according to claim 7, characterized in that: The transmission shaft is a hollow shaft.

9. The lithium carbonate circulation grinding device according to claim 1 or 2, characterized in that: The lifting mechanism is a bucket elevator.

10. The lithium carbonate circulation grinding device according to claim 2, characterized in that: Four supporting legs evenly distributed around the circumference are connected to the outer conical surface of the discharge hopper to support the entire shell on the ground.

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