Rare earth chloride clean production system

Abstract

The invention relates to the field of rare earth chloride production, in particular to a rare earth chloride clean production system which comprises a storage tank, a control terminal, a concentration part and a crystallization part, a plurality of concentration basins of the concentration part are distributed in a stepped mode and are divided into a plurality of concentration levels according to the sequence from high to low, and the crystallization part is connected with the storage tank. The concentration tanks of all the concentration levels are equal in number and are connected in series step by step, a heat absorption plate, a concentration meter and a liquid level sensor are installed in each concentration tank, a liquid outlet of the storage tank is communicated with a liquid inlet pipe of the concentration part through a pipeline provided with a pump body, and a liquid outlet pipe of the concentration part is communicated with the crystallization part through a pipeline provided with a pump body; and the crystallization part is used for realizing crystallization and collection of rare earth chloride. Through step-by-step layering of the concentration tank, rapid and continuous concentration of the rare earth chloride solution is realized, the concentration and crystallization time of the rare earth chloride is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the field of rare earth chloride production, and in particular to a clean production system of rare earth chloride. Background Art

[0002] As an important rare earth compound, rare earth chlorides are widely used in rare earth metals, petrochemicals, agriculture, medicine, electronic equipment and communications, optoelectronics, energy, environmental protection and other fields. In the agricultural field, rare earth chlorides can improve the stress resistance of plants. In medicine, lanthanum chloride can inhibit the growth of tumor cells. In the field of functional materials, lanthanum chloride hydrate is an antiferromagnetic material that can be used as a storage medium for data storage and can also be used to prepare magnetic sensors and other equipment. In light industry, rare earth chlorides are used for leather tanning and textile dyeing. In environmental protection management, rare earth chlorides can be used for the treatment of fluoride-containing wastewater and phosphorus-containing wastewater.

[0003] In addition, rare earth chlorides are also the raw materials for preparing rare earth metals by chloride electrolysis. Rare earth chlorides can also be used to prepare high-temperature ceramic materials, piezoelectric ceramics and other electronic components. Cerium chloride is an indispensable and important raw material for petroleum catalytic cracking FCC.

[0004] In the prior art, there are two common methods for obtaining rare earth chloride crystals from rare earth chloride solutions. One is high-temperature evaporation concentration crystallization, which usually adopts a single-effect or multi-effect high-temperature heating method under normal pressure or slightly negative pressure, evaporates and concentrates the feed liquid, evaporates the water, and cools and crystallizes the feed liquid after reaching a certain concentration. On the one hand, this method requires high-temperature evaporation, consumes a lot of energy, and increases production costs; on the other hand, hydrogen chloride gas is easily evaporated during the high-temperature evaporation process, which reduces the local acidity of the rare earth chloride solution, causes the precipitation of rare earth hydroxides, causes the loss of rare earth elements, and causes turbidity of rare earth chloride crystal products.

[0005] Another method is natural evaporation concentration crystallization, which is limited by the natural environment. For example, factors such as rainfall, light intensity, etc. will seriously affect the concentration rate of rare earth chlorides and thus affect production efficiency. Summary of the invention

[0006] In order to solve the above-mentioned technical problems, the present invention provides a clean production system for rare earth chloride, which produces rare earth chloride crystals by adopting natural evaporation, concentration and crystallization, thereby solving the energy consumption problem and product concentration problem of high-temperature evaporation; by improving the concentration tank structure and circulation method in natural evaporation, concentration and crystallization, and providing an intelligent shielding mechanism in the concentration link, the problem of slow rare earth chloride concentration progress caused by insufficient light intensity, rainy weather, etc. is solved.

[0007] The invention discloses a rare earth chloride clean production system, comprising a storage tank, a control terminal, a concentration part and a crystallization part.

[0008] The concentrating section includes a concentrating tank, a liquid inlet pipe and a liquid outlet pipe. The concentrating tanks are distributed in a stepped manner. The concentrating tanks are divided into a plurality of concentrating levels in order from high to low, and the number of the concentrating tanks in each concentrating level is equal.

[0009] A heat absorbing plate is installed inside the concentration tank, and a concentration meter and a liquid level sensor are installed on the top of the concentration tank.

[0010] The inlet of the concentrating tank is opened at the top of the side, and the outlet of the concentrating tank is opened at the bottom of the side. The inlet and outlet of the concentrating tank are fixedly installed with solenoid valves. The solenoid valves at the outlets of several concentrating tanks on the upper layer are fixedly connected with the solenoid valves at the inlets of several concentrating tanks on the lower layer through transmission pipelines.

[0011] The electromagnetic valves at the inlets of the uppermost concentrators are fixedly connected to the liquid inlet pipes, respectively, and the electromagnetic valves at the outlets of the lowermost concentrators are fixedly connected to the liquid outlet pipes, respectively.

[0012] The solenoid valve, concentration meter and liquid level sensor are respectively connected to the control terminal signal.

[0013] The liquid outlet of the storage tank is connected to the liquid inlet pipe through a pipeline installed with a pump body, and the liquid outlet pipe is connected to the crystallization part through a pipeline installed with a pump body. The crystallization part is used to realize the crystallization and collection of rare earth chlorides.

[0014] Preferably, the crystallization section includes a crystallization pool, a feed pipe and a discharge workshop, the liquid discharge pipe is connected to the feed pipe through a pipeline equipped with a pump body, the feed pipe is connected to each crystallization pool through a plurality of shunt pipes, a working channel is provided between adjacent crystallization pools, and the plurality of crystallization pools are symmetrically distributed on both sides of the discharge workshop, and the discharge workshop is used to collect and store the rare earth chloride crystals in the crystallization pool.

[0015] Preferably, a shielding mechanism is installed above the concentration tank, and the shielding mechanism includes a winding box, and the winding box is fixedly installed on the backlight surface of the concentration tank. A guide rail is obliquely installed on the side of the concentration tank, and a plurality of legs are evenly fixed on the bottom of the guide rail.

[0016] A first drive shaft is rotatably mounted on the top end of the guide rail. The first drive shaft is coaxially fixed with a first pulley. The first pulley is driven by a second pulley through a transmission belt. The second pulley is rotatably mounted on the bottom end of the guide rail.

[0017] The transmission belt is fixed to the slider, the slider is slidably configured in the guide rail, the slider is fixed to the connecting shaft, the connecting shaft is fixed to the first end of the rain shield cloth, the middle part of the rain shield cloth is overlapped on the first driving shaft, the second end of the rain shield cloth is fixedly wound on the reel, and the reel is rotatably installed on the winding box.

[0018] The first driving shaft and the winding shaft are respectively drivingly connected to the output end of the motor, and the motor is fixed to the winding box.

[0019] Preferably, the output end of the motor drives the first drive shaft and the reel to rotate through a driving mechanism, and the driving mechanism includes a square shaft, and the output end of the motor is coaxially fixed to the square shaft.

[0020] The square shaft sliding sleeve is arranged inside the sleeve, a first bevel gear is coaxially fixed to the first end of the sleeve, the first bevel gear is intermittently meshed with the second bevel gear, the second bevel gear is coaxially fixed to the first driving shaft, the second end of the sleeve is coaxially fixed to the third bevel gear, the third bevel gear is intermittently meshed with the fourth bevel gear, the fourth bevel gear is coaxially fixed to the reel.

[0021] The middle part of the sleeve is rotatably mounted on the first end of the driving plate, the second end of the driving plate is fixed to the output end of the electric cylinder, and the electric cylinder is fixed to the winding box.

[0022] Preferably, the rare earth chloride crystals in the discharging workshop are separated into solid and liquid by a centrifugal dehydrator, and the liquid outlet of the centrifugal dehydrator is connected to the liquid inlet pipe through a pipeline equipped with a pump body.

[0023] Preferably, the structure consisting of the guide rail, the leg, the first pulley, the transmission belt, the second pulley and the slider is symmetrically distributed in two groups about the center of the connecting axis.

[0024] Preferably, the electric cylinder is arranged parallel to the square axis.

[0025] Preferably, the sleeve is coaxially provided with a square hole matching the square shaft.

[0026] Preferably, baffles are installed above the liquid inlet pipe, the liquid outlet pipe and a plurality of the solenoid valves.

[0027] After adopting the above technical solution, the beneficial effects of the present invention are: 1. The present invention adopts the method of natural air-drying evaporation concentration to prepare rare earth chloride crystals, avoiding the problem of large amount of energy consumption in the traditional process of forced solidification transformation through steam heating, reducing production costs and being more environmentally friendly.

[0028] 2. The present invention sets up concentration tanks step by step, measures the concentration and liquid level of the rare earth chloride solution in the concentration tanks in real time, and cooperates with electromagnetic valves to realize intelligent and efficient transfer of the rare earth chloride solution, thereby greatly improving the concentration speed of the rare earth chloride solution and improving production efficiency.

[0029] 3. The present invention provides an automatically retractable shielding mechanism above the concentration tank to avoid the influence of rain and other weather conditions on the concentration progress, thereby avoiding a significant influence of weather on the concentration progress of the rare earth chloride solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] 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 described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 This is a schematic diagram of the structure and installation of a clean production system for rare earth chlorides; Figure 2 It is a structural schematic diagram of the concentration section; Figure 3 This is a schematic diagram of the location distribution of the concentration tanks; Figure 4 It is a structural schematic diagram of the concentration tank; Figure 5 It is a longitudinal section schematic diagram of the concentration tank; Figure 6 It is a schematic diagram of the local structure of the shielding mechanism; Figure 7 for Figure 6 A partial enlarged schematic diagram of Figure 8 Schematic diagram of the structure of the crystal part.

[0032] Description of reference numerals: 101-storage tank, 102-centrifugal dehydrator, 103-control terminal; 200-concentration section, 201-concentration tank, 202-baffle, 203-liquid inlet pipe, 204-liquid outlet pipe, 205-solenoid valve, 206-heat absorbing plate, 207-concentrator, 208-liquid level sensor, 210-shielding mechanism, 211-winding box, 212-first driving shaft, 213-guide rail, 214-leg, 215-first pulley, 216-transmission belt, 217-second pulley, 218-slider, 219-connecting shaft, 220-rain shield, 221-reel, 222-motor, 230-driving mechanism, 231-square shaft, 232-sleeve, 233-first bevel gear, 234-second bevel gear, 235-third bevel gear, 236-fourth bevel gear, 237-driving plate, 238-electric cylinder; 300-crystallization section, 301-crystallization pool, 302-feeding pipe, 303-discharging workshop. DETAILED DESCRIPTION

[0033] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0034] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "installation, connection" should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection or an integral connection; it can be directly connected or indirectly connected. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0035] The embodiment of the present invention provides a rare earth chloride clean production system, such as Figures 1 to 8As shown, the rare earth chloride clean production system includes a storage tank 101, which is used to store a rare earth chloride solution. The rare earth chloride solution is concentrated step by step in a concentration section 200. The concentration section 200 includes a concentration tank 201, a liquid inlet pipe 203, and a liquid outlet pipe 204. Several concentration tanks 201 are distributed in a stepped manner. Several concentration tanks 201 with the same step height are the same concentration level. Several concentration levels are distributed in a stepped manner from high to low. The number of concentration tanks 201 in each concentration level is equal. The concentration of the rare earth chloride solution in each concentration level increases from high to low. The rare earth chloride solution is concentrated into a saturated rare earth chloride solution in the lowest concentration level.

[0036] The outlet of the storage tank 101 is connected to the liquid inlet pipe 203 through a pipeline equipped with a pump body, the liquid inlet pipe 203 is connected to the inlets of several concentration tanks 201 at the top layer, the liquid outlet pipe 204 is connected to the outlets of several concentration tanks 201 at the bottom layer, and the liquid outlet pipe 204 is connected to the crystallization part 300 through a pipeline equipped with a pump body.

[0037] The crystallization section 300 includes a crystallization pool 301, a feed pipe 302 and a discharge workshop 303. The saturated rare earth chloride solution is first transported to the crystallization pool 301 through the feed pipe 302 to produce rare earth chloride crystals. The rare earth chloride crystals are collected through the discharge workshop 303 and transferred to the centrifugal dehydrator 102 for dehydration to separate the solid and liquid of the rare earth chloride. The liquid after solid-liquid separation is transported to the liquid inlet pipe 203 through a pipeline equipped with a pump body for circulation and concentration. The separated rare earth chloride crystals are collected and packaged as the final product.

[0038] Among them, several crystallization pools 301 are symmetrically distributed on both sides of the discharge workshop 303, and several crystallization pools 301 are evenly distributed along the length direction of the discharge workshop 303. A working channel is arranged between two adjacent crystallization pools 301 to facilitate the transfer of rare earth chloride crystals precipitated in each crystallization pool 301 to the discharge workshop 303. Several shunt pipes are arranged on the feed pipe 302 for transporting the saturated rare earth chloride solution in the feed pipe 302 to each crystallization pool 301.

[0039] Before rare earth chloride is prepared from rare earth ore or rare earth waste, hydrochloric acid is used to extract rare earth elements in the rare earth ore or rare earth waste, and rare earth chloride is extracted using an extractant to obtain a rare earth chloride solution. However, since the rare earth chloride solution contains some impurities, such as metal element ions such as Ca, Al, Fe, etc., in order to avoid the occurrence of sediments during the preparation process of rare earth chloride crystal concentration, thereby affecting the purity and quality of the rare earth chloride product, acidity adjustment is required before rare earth chloride concentration. In the present invention, rare earth chloride is adjusted to a pH value of 4.5 to 7, and then preliminary filtration and impurity removal are performed, and then it is transported to the storage tank 101 for storage, which is convenient for subsequent concentration and crystallization.

[0040] As a further explanation of the present invention, Figures 1 to 5 As shown, the inlet of the concentrating tank 201 is opened at the top of the side, and the outlet of the concentrating tank 201 is opened at the bottom of the side. The inlet and outlet of the concentrating tank 201 are fixedly installed with solenoid valves 205 connected to the inside of the concentrating tank 201. The solenoid valves 205 at the inlets of the uppermost concentrating tanks 201 are fixedly connected to the liquid inlet pipe 203 respectively, and the solenoid valves 205 at the outlets of the lowermost concentrating tanks 201 are fixedly connected to the liquid outlet pipe 204 respectively. The solenoid valves 205 at the outlets of the uppermost concentrating tanks 201 are fixedly connected to the solenoid valves 205 at the inlets of the lowermost concentrating tanks 201 through transmission pipelines.

[0041] The above structure enables the rare earth chloride solution in the concentration tank 201 of the previous concentration level to be smoothly transported to the concentration tank 201 of the next concentration level through the solenoid valve 205 and the transmission pipeline for further concentration, thereby realizing the step-by-step concentration of the rare earth chloride solution.

[0042] like Figure 4 , 5 As shown, a heat absorbing plate 206 is fixedly installed inside the concentration tank 201, and the heat absorbing plate 206 can absorb solar radiation, thereby increasing the temperature of the rare earth chloride concentration in the concentration tank 201. A concentration meter 207 is fixedly installed on the top of the side of the concentration tank 201. The concentration meter 207 is used to measure the concentration of the rare earth chloride in the concentration tank 201. A liquid level sensor 208 is fixedly installed on the top of the side of the concentration tank 201. The liquid level sensor 208 is used to measure the liquid level of the rare earth chloride solution in the concentration tank 201. The solenoid valve 205, the concentration meter 207 and the liquid level sensor 208 are respectively connected to the control terminal 103 by signal. The control terminal 103 is used to receive data from the concentration meter 207 and the liquid level sensor 208 corresponding to each concentration tank 201, so as to obtain the concentration and liquid level of the rare earth chloride in each concentration tank 201, and the control terminal 103 controls the opening and closing of each solenoid valve 205 respectively to realize the inflow and outflow of the solution in each concentration tank 201.

[0043] The transmission pipelines between adjacent concentration levels are arranged horizontally, that is, the outlet of the concentration tank 201 of the previous concentration level is aligned with the inlet of the concentration tank 201 of the next concentration level. With this structure, after two adjacent concentration levels are connected through the transmission pipeline and the solenoid valve 205, the rare earth chloride solution can be automatically transferred from the previous concentration level to the next concentration level.

[0044] Among them, baffles 202 are fixedly installed above the plurality of solenoid valves 205 and the transmission pipelines, so as to shield and protect the solenoid valves 205 and the transmission pipelines.

[0045] The above-mentioned embodiment of the present invention can effectively realize the full and efficient utilization of the concentration tank 201 in each concentration level. Before the rare earth chloride is concentrated, a maximum concentration threshold is set for each concentration level, that is, the maximum concentration value of the rare earth chloride in each concentration level is set, and a unified liquid level height value is set for each concentration tank 201. The concentration meter 207 monitors the concentration of the rare earth chloride in each concentration tank 201 in real time. When the concentration of the rare earth chloride in the concentration tank 201 reaches the maximum concentration value of the concentration level, the control terminal 103 controls the solenoid valve 205 at the outlet of the concentration tank 201 to open.

[0046] In addition, the liquid level sensor 208 detects the liquid level of the rare earth chloride solution in the concentration tank 201 in real time. After the solution in the concentration tank 201 is emptied, the control terminal 103 controls the solenoid valve 205 at the outlet of the concentration tank 201 to close, and controls the solenoid valve 205 at the inlet of the concentration tank 201 to open. When the rare earth chloride solution in the concentration tank 201 reaches a preset liquid level value, the control terminal 103 controls the solenoid valve 205 at the inlet of the concentration tank 201 to close.

[0047] In addition, due to the influence of objective factors such as the environment, location distribution, and lighting conditions, the evaporation and concentration speeds of each concentration tank 201 at the same concentration level are different. Therefore, in order to avoid inefficient circulation caused by waiting during the step-by-step concentration process, the present invention connects a number of concentration tanks 201 in parallel at each concentration level, and through the above-mentioned control method, the rare earth chloride solution of the previous concentration level can be transferred to the next concentration level with the fastest efficiency, thereby improving the utilization rate of the concentration tank 201.

[0048] In addition, a heat absorbing plate 206 is provided in the concentration tank 201 so as to absorb more solar radiation energy per unit area, thereby increasing the temperature of the rare earth chloride solution in the concentration tank 201 and accelerating the evaporation and concentration speed of the solution.

[0049] In the process of concentrating the rare earth chloride solution using the above structure and method, the depth of the rare earth chloride solution in the concentration tank 201 is controlled at 10 cm to 15 cm. The lower liquid level allows the rare earth chloride solution to heat up quickly, thereby increasing the evaporation rate.

[0050] In addition, the control of the inflow and outflow of the rare earth chloride solution in the concentration tank 201 can realize the efficient transfer of the solution, thereby realizing the rapid concentration of the rare earth chloride solution, thereby greatly reducing the concentration time of the rare earth chloride solution and greatly improving the production efficiency.

[0051] For further explanation of the present invention, see Figure 2 , 6 7. In order to avoid the influence of rainy weather on the above-mentioned concentration process, a shielding mechanism 210 is further provided above the concentration tank 201. The shielding mechanism 210 includes a winding box 211, a guide rail 213, a support leg 214 and a motor 222. The winding box 211 is fixedly installed on the backlight surface of the concentration tank 201 at the topmost concentration level to avoid blocking light and affecting the evaporation and concentration of the rare earth chloride solution in the concentration tank 201.

[0052] Guide rails 213 are installed obliquely on the side of each level of the concentration tank 201, and a plurality of legs 214 are evenly fixed on the bottom of the guide rails 213 for fixing and installing the guide rails 213 to keep the guide rails 213 stable.

[0053] A first drive shaft 212 is rotatably installed at the top of the guide rail 213, and the first drive shaft 212 is coaxially fixed with the first pulley 215. The first pulley 215 is driven by the second pulley 217 through a transmission belt 216. The second pulley 217 is rotatably installed at the bottom end of the guide rail 213, and the transmission belt 216 is fixedly connected to a slider 218. The slider 218 is slidably configured in the guide rail 213. The slider 218 is fixedly connected to a connecting shaft 219, and the connecting shaft 219 is fixedly connected to a first end of a rain shield 220. The middle part of the rain shield 220 is overlapped on the outer circumference of the first drive shaft 212, and the second end of the rain shield 220 is fixedly connected to a reel 221, and the rain shield 220 can be wound around the outer surface of the reel 221, and the reel 221 is rotatably installed on the winding box 211.

[0054] The motor 222 is fixedly connected to the winding box 211. The motor 222 alternately drives the first driving shaft 212 and the reel 221 to rotate through the driving mechanism 230. When the first driving shaft 212 is driven to rotate, the slider 218 slides downward along the guide rail 213. When the driving rod reel 221 rotates, the rain shield 220 is wound around the reel 221, and then the connecting shaft 219 and the slider 218 are driven to slide upward along the guide rail 213 through the rain shield 220.

[0055] Among them, the structure composed of the guide rail 213, the support leg 214, the first pulley 215, the transmission belt 216, the second pulley 217, and the slider 218 is symmetrically distributed in two groups about the center of the connecting shaft 219, so that the rain shield 220 remains stable during the process of unfolding or rolling up, thereby meeting the shielding requirements of the rain shield 220 for the concentration tank 201.

[0056] See also Figure 7 The driving mechanism 230 includes a square shaft 231, the output end of the motor 222 is coaxially fixed with the first end of the square shaft 231, the square shaft 231 is slidably sleeved inside the sleeve 232, the first end of the sleeve 232 is coaxially fixed with a first bevel gear 233, the first bevel gear 233 is intermittently meshed with the second bevel gear 234, the second bevel gear 234 is coaxially fixed with the first driving shaft 212, the second end of the sleeve 232 is coaxially fixed with the third bevel gear 235, the third bevel gear 235 is intermittently meshed with the fourth bevel gear 236, and the fourth bevel gear 236 is coaxially fixed with the reel 221.

[0057] The middle part of the sleeve 232 is rotatably mounted on the first end of the driving plate 237 , and the second end of the driving plate 237 is fixedly connected to the output end of the electric cylinder 238 . The electric cylinder 238 is arranged parallel to the square shaft 231 , and the electric cylinder 238 is fixedly connected to the inside of the winding box 211 .

[0058] Among them, the sleeve 232 is coaxially opened with a square hole that matches the square shaft 231, so that the motor 222 can smoothly drive the sleeve 232 to rotate synchronously through the square shaft 231, and the sleeve 232 can slide back and forth along the square shaft 231, thereby realizing the motor 222 intermittently driving the first drive shaft 212 and the reel 221 to rotate.

[0059] In the above structure of the present invention, by driving the slider 218 and the connecting shaft 219 to change their positions, the rain shield 220 can be adjusted to see whether it covers the stepped concentration tanks 201 .

[0060] When it is necessary to shield several stepped concentration tanks 201, the electric cylinder 238 drives the driving plate 237 and the sleeve 232 to move upward through its output end until the first bevel gear 233 is meshed with the second bevel gear 234. At this time, the output end of the motor 222 drives the sleeve 232 to rotate, and through the meshing relationship between the first bevel gear 233 and the second bevel gear 234, the second bevel gear 234 and the first drive shaft 212 are smoothly driven to rotate synchronously. The first drive shaft 212 further drives the transmission belt 216 to rotate around the first pulley 215 and the second pulley 217 through the first pulley 215 coaxially fixed thereto, thereby driving the slider 218 and the connecting shaft 219 fixed to the transmission belt 216 to move along the length direction of the guide rail 213. When the slider 218 and the connecting shaft 219 move downward, the rain shield 220 wrapped around the reel 221 is gradually unwound, so that the rain shield 220 completes the shielding of the concentration tank 201.

[0061] On the contrary, when it is necessary to remove the obstruction of the concentration tank 201, the electric cylinder 238 drives the driving plate 237 and the sleeve 232 to move downward through its output end until the third bevel gear 235 is meshed with the fourth bevel gear 236. At this time, the output end of the motor 222 drives the sleeve 232 to rotate, and through the meshing relationship between the third bevel gear 235 and the fourth bevel gear 236, the fourth bevel gear 236 and the reel 221 are smoothly driven to rotate synchronously, so that the reel 221 gradually winds the rain shield 220 around its outer surface. During the winding process of the rain shield 220, the supporting effect of the first drive shaft 212 is used to pull the connecting shaft 219 and the slider 218 at the other end of the rain shield 220, so that the connecting shaft 219 and the slider 218 slide upward along the length direction of the guide rail 213 until the rain shield 220 no longer blocks the concentration tank 201.

[0062] Therefore, through the above structure, combined with the control of the motor 222 and the electric cylinder 238, the switching between the shielded and unshielded states of the concentration tank 201 can be automatically realized, which facilitates the rapid shielding of the concentration tank 201 in rainy weather, thereby avoiding the influence of rainy weather on the rare earth chloride concentration process.

[0063] According to the embodiments of the present invention as described above, these embodiments do not describe all the details in detail, nor do they limit the invention to the only specific embodiments. Obviously, based on the above description, many modifications and changes can be made. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and the modified use based on the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A rare earth chloride clean production system, comprising a storage tank (101), a control terminal (103), a concentration unit (200) and a crystallization unit (300), characterized in that: The concentrating section (200) comprises a concentrating tank (201), a liquid inlet pipe (203) and a liquid outlet pipe (204), wherein the plurality of concentrating tanks (201) are distributed in a stepped manner, and the concentrating tanks (201) are divided into a plurality of concentrating levels in order from high to low, and the number of the concentrating tanks (201) in each concentrating level is equal; A heat absorbing plate (206) is installed inside the concentration tank (201), and a concentration meter (207) and a liquid level sensor (208) are installed on the top of the concentration tank (201); The inlet of the concentration tank (201) is opened at the top of the side, and the outlet of the concentration tank (201) is opened at the bottom of the side. The inlet and outlet of the concentration tank (201) are both fixedly installed with electromagnetic valves (205). The electromagnetic valves (205) at the outlets of the plurality of concentration tanks (201) on the upper layer are fixedly connected to the electromagnetic valves (205) at the inlets of the plurality of concentration tanks (201) on the lower layer through transmission pipelines. The solenoid valves (205) at the inlets of the plurality of concentration tanks (201) at the top layer are fixedly connected to the liquid inlet pipes (203), and the solenoid valves (205) at the outlets of the plurality of concentration tanks (201) at the bottom layer are fixedly connected to the liquid outlet pipes (204); The solenoid valve (205), the concentration meter (207) and the liquid level sensor (208) are respectively connected to the control terminal (103) by signals; The liquid outlet of the storage tank (101) is connected to the liquid inlet pipe (203) through a pipeline installed with a pump body, and the liquid outlet pipe (204) is connected to the crystallization part (300) through a pipeline installed with a pump body. The crystallization part (300) is used to achieve crystallization and collection of rare earth chlorides.

2. A rare earth chloride clean production system according to claim 1, characterized in that: The crystallization section (300) comprises a crystallization pool (301), a feed pipe (302) and a discharge workshop (303); the liquid discharge pipe (204) is connected to the feed pipe (302) via a pipeline equipped with a pump body; the feed pipe (302) is connected to each crystallization pool (301) via a plurality of shunt pipes; a working channel is provided between adjacent crystallization pools (301); the plurality of crystallization pools (301) are symmetrically distributed on both sides of the discharge workshop (303); and the discharge workshop (303) is used to collect and store rare earth chloride crystals in the crystallization pool (301).

3. A rare earth chloride clean production system according to claim 1, characterized in that: A shielding mechanism (210) is installed above the concentration tank (201), the shielding mechanism (210) comprising a winding box (211), the winding box (211) being fixedly installed on the backlight surface of the concentration tank (201), a guide rail (213) being obliquely installed on the side of the concentration tank (201), a plurality of legs (214) being evenly fixed on the bottom of the guide rail (213); A first drive shaft (212) is rotatably mounted on the top end of the guide rail (213); the first drive shaft (212) is coaxially fixed with a first pulley (215); the first pulley (215) is driven by a second pulley (217) via a transmission belt (216); and the second pulley (217) is rotatably mounted on the bottom end of the guide rail (213); The transmission belt (216) is fixed to the slider (218), the slider (218) is slidably arranged in the guide rail (213), the slider (218) is fixed to the connecting shaft (219), the connecting shaft (219) is fixed to the first end of the rain shield (220), the middle part of the rain shield (220) is overlapped on the first driving shaft (212), the second end of the rain shield (220) is fixedly wound on the reel (221), and the reel (221) is rotatably mounted on the reel box (211); The first driving shaft (212) and the reel (221) are respectively drivingly connected to the output end of the motor (222), and the motor (222) is fixed to the reel box (211).

4. A rare earth chloride clean production system according to claim 3, characterized in that: The output end of the motor (222) drives the first drive shaft (212) and the reel (221) to rotate via a drive mechanism (230), the drive mechanism (230) comprising a square shaft (231), and the output end of the motor (222) is coaxially fixed to the square shaft (231); The square shaft (231) is slidably sleeved inside the sleeve (232); a first bevel gear (233) is coaxially fixed to the first end of the sleeve (232); the first bevel gear (233) is intermittently meshed with the second bevel gear (234); the second bevel gear (234) is coaxially fixed to the first drive shaft (212); the second end of the sleeve (232) is coaxially fixed to the third bevel gear (235); the third bevel gear (235) is intermittently meshed with the fourth bevel gear (236); the fourth bevel gear (236) is coaxially fixed to the reel (221); The middle portion of the sleeve (232) is rotatably mounted on the first end of the driving plate (237), the second end of the driving plate (237) is fixed to the output end of the electric cylinder (238), and the electric cylinder (238) is fixed to the winding box (211).

5. A rare earth chloride clean production system according to claim 2, characterized in that: The rare earth chloride crystals in the discharge workshop (303) are separated into solid and liquid by a centrifugal dehydrator (102), and the liquid outlet of the centrifugal dehydrator (102) is connected to the liquid inlet pipe (203) via a pipeline equipped with a pump body.

6. A rare earth chloride clean production system according to claim 3, characterized in that: The structure consisting of the guide rail (213), the support leg (214), the first pulley (215), the transmission belt (216), the second pulley (217) and the slider (218) is symmetrically distributed in two groups about the center of the connecting shaft (219).

7. A rare earth chloride clean production system according to claim 4, characterized in that: The electric cylinder (238) is arranged in parallel with the square shaft (231).

8. A rare earth chloride clean production system according to claim 4, characterized in that: The sleeve (232) is coaxially provided with a square hole that matches the square shaft (231).

9. A rare earth chloride clean production system according to claim 1, characterized in that: A baffle (202) is installed above the liquid inlet pipe (203), the liquid outlet pipe (204) and the plurality of solenoid valves (205).

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