Continuous dissolving and purifying device

Abstract

The utility model discloses a continuous dissolving and purifying device which comprises a first-stage dissolving tank, a second-stage dissolving tank, a third-stage dissolving tank and a filter, an overflow concealed pipe is arranged in the first-stage dissolving tank, and filtering equipment is arranged at the top of the overflow concealed pipe; the height of the overflow concealed pipe is smaller than the depth of the primary dissolving tank; the lower part of one side of the secondary dissolving tank is connected with the lower part of the overflow concealed pipe through a first connecting pipe; the upper part of the other side of the second-stage dissolving tank is connected with the upper part of one side of the third-stage dissolving tank through a second connecting pipe; the lower part of the other side of the third-stage dissolving tank is connected with a filter through a third connecting pipe; stirring equipment is arranged in each of the first-stage dissolving tank, the second-stage dissolving tank and the third-stage dissolving tank. The continuous dissolving and purifying device can realize continuous dissolving and purifying, and the utilization rate of equipment is improved.

Description

Technical Field

[0001] The utility model relates to a continuous dissolving and purifying device, in particular to a continuous dissolving and purifying device for soluble salt. Background Art

[0002] The dissolution of soluble salt substances is very common in the field of hydrometallurgy. For example, soluble salts such as ammonium bicarbonate, sodium carbonate, and sodium bicarbonate, which are commonly used precipitants in rare earth hydrometallurgy production, are the main rare earth precipitants and play an important role in the rare earth production process. They are widely used because of their low price, good stability, easy storage and transportation, easy recovery of thermal decomposition products, low environmental pollution, high precipitation efficiency, and high rare earth recovery rate. At the same time, they can dilute and adjust the chemical reaction rate and temperature, thereby achieving refined and stable control. Therefore, in the rare earth production process, studying the efficient dissolution process of soluble salt precipitants will be a very effective strategy.

[0003] At present, the dissolution of some soluble salts commonly used in hydrometallurgical production all adopts the intermittent dissolution method, which has high work intensity, uneven steam consumption, long dissolution time and unstable concentration control.

[0004] CN21156228U discloses a sodium carbonate solution preparation device, including a dissolving tank, a stirring paddle is provided in the dissolving tank, the stirring paddle is connected to a motor, an exhaust hopper is provided above the feeding port of the dissolving tank, the exhaust hopper is connected to a washing tank through an exhaust pipe, and the exhaust pipe is located below the liquid level of the washing tank. The preparation device belongs to an intermittent dissolving device.

[0005] CN213995695U discloses a powder dissolving and preparing device, comprising a dissolving tank, wherein a first baffle plate and a second baffle plate are respectively arranged in the dissolving tank; the first baffle plate and the second baffle plate sequentially divide the dissolving tank into a mixing tank, a blending tank and a storage tank which are interconnected; and a stirring device is arranged in the mixing tank and the blending tank. Although the preparing device can basically realize continuous dissolution, it is inconvenient to repair and replace the device when a fault occurs, and the production process will be delayed.

[0006] In addition, the above two preparation devices still need to be strengthened in terms of coarse filtration and fine filtration. Utility Model Content

[0007] In view of this, the purpose of the utility model is to provide a continuous dissolution and purification device, which can realize continuous dissolution and continuous purification, improve equipment utilization, and facilitate subsequent maintenance and replacement without basically affecting the production process.

[0008] The utility model adopts the following technical solutions to achieve the above-mentioned purpose.

[0009] The utility model provides a continuous dissolution and purification device, comprising a primary dissolution tank, a secondary dissolution tank, a tertiary dissolution tank and a filter;

[0010] An overflow blind pipe is provided in the primary dissolving tank, and a filtering device is provided on the top of the overflow blind pipe; the height of the overflow blind pipe is less than the depth of the primary dissolving tank;

[0011] The lower part of one side of the secondary dissolution tank is connected to the lower part of the overflow blind pipe through a first connecting pipe; the upper part of the other side of the secondary dissolution tank is connected to the upper part of one side of the tertiary dissolution tank through a second connecting pipe; the lower part of the other side of the tertiary dissolution tank is connected to the filter through a third connecting pipe;

[0012] The first-stage dissolving tank, the second-stage dissolving tank and the third-stage dissolving tank are all provided with stirring equipment.

[0013] According to the continuous dissolution and purification device described in the utility model, preferably, the filter includes a basket filter and a fiber ball filter; the basket filter is connected to the lower part of the three-stage dissolution tank through a third connecting pipe; the fiber ball filter is connected to the basket filter.

[0014] According to the continuous dissolution and purification device of the utility model, preferably, it also includes a material transfer pump, and the material transfer pump is arranged between the basket filter and the fiber ball filter.

[0015] According to the continuous dissolution and purification device described in the utility model, preferably, the first-level dissolution tank includes a first-level tank body and a first-level tank cover, and the first-level tank body is configured as a cylindrical structure with an opening on the top; the first-level tank cover is arranged on the first-level tank body for sealing the first-level tank body.

[0016] According to the continuous dissolution and purification device of the utility model, preferably, the first-level tank cover is provided with a solvent inlet, a solid inlet, a vent and a manhole.

[0017] According to the continuous dissolution and purification device of the utility model, preferably, a steam port and a spare port are also provided on the first-level tank cover.

[0018] According to the continuous dissolution and purification device described in the utility model, preferably, the filtering equipment is a filter basket; the filter basket includes a basket, a connecting rod and a handle; the basket includes a basket body with an outward curling edge, and the basket body has a filter net; the curling edge is configured to be stuck on the pipe wall of the overflow concealed pipe, and the basket body is configured to be accommodated in the overflow concealed pipe and match the overflow concealed pipe; there are two connecting rods, which are vertically arranged on the basket body; the handle is connected to the top of the connecting rod.

[0019] According to the continuous dissolution and purification device described in the utility model, preferably, the first-level tank cover is also provided with a filter device replacement observation port; and the handle is located below the filter device replacement observation port.

[0020] According to the continuous dissolution and purification device described in the utility model, preferably, the secondary dissolution tank includes a secondary tank body and a secondary tank cover; the secondary tank cover is arranged on the secondary tank body; the tertiary dissolution tank includes a tertiary tank body and a tertiary tank cover; the tertiary tank cover is arranged on the tertiary tank body; the secondary tank cover and the tertiary tank cover are both provided with ventilation holes and manholes.

[0021] According to the continuous dissolution and purification device of the present invention, preferably, an online concentration detector is also provided on the three-stage dissolution tank.

[0022] The continuous dissolution and purification device of the utility model uses the "up-down-down-up-up-down" connection method to make the dissolution route the longest, ensure sufficient dissolution time, give full play to the equipment production capacity, improve equipment utilization, and facilitate later maintenance and replacement. The utility model can effectively intercept large pieces of fiber scraps or other mechanical impurities after the packaging bag is broken by setting an overflow dark pipe and a filtering device, reducing the blockage of pipes and valves and the wear of stirring during the dissolution process. In addition, the utility model can also interlock with the automatic feeding system through an online concentration meter to achieve 24-hour continuous dissolution, reduce the intermediate resource usage, and cooperate with the dissolution flow control system to achieve precise preparation, so that the concentration of the prepared soluble salt solution is more stable, while also reducing the workload and operation difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The utility model is a structural schematic diagram of a continuous dissolution and purification device.

[0024] Figure 2 for Figure 1 Schematic top view of .

[0025] The following are the descriptions of the reference numerals:

[0026] 1-primary dissolving tank, 101-solvent inlet, 102-solid inlet, 103-ventilation port, 104-stirring port, 105-manhole, 106-steam port, 107-spare port, 108-filter equipment replacement observation port, 11-overflow blind pipe, 12-filter equipment, 2-secondary dissolving tank, 3-tertiary dissolving tank, 4-first connecting pipe, 5-second connecting pipe, 6-third connecting pipe, 71-basket filter, 72-fiber ball filter, 8-material transfer pump. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited thereto.

[0028] The continuous dissolution and purification device of the utility model comprises a primary dissolution tank, a secondary dissolution tank, a tertiary dissolution tank, a first connecting pipe, a second connecting pipe, a third connecting pipe, a filter and a material transfer pump. Optionally, it also comprises a feeding system. The following is a detailed description.

[0029] <Multi-stage dissolving tank and connecting pipe>

[0030] The multi-stage dissolving tank includes a primary dissolving tank, a secondary dissolving tank and a tertiary dissolving tank. The utility model connects the dissolving tanks in an "up-down-down-up-up-down" manner, which makes the dissolving route the longest, ensures sufficient dissolving time, gives full play to the equipment capacity, and improves the equipment utilization rate. In addition, each dissolving tank is independent, which is convenient for later maintenance.

[0031] Primary dissolving tank, overflow pipe and filtration equipment

[0032] In the utility model, an overflow dark pipe, a filtering device and a stirring device are arranged in the first-level dissolving tank.

[0033] The primary dissolving tank includes a primary tank body and a primary tank cover. The primary tank body is configured as a cylindrical structure with an opening at the top. The primary tank cover is disposed on the primary tank body and is used to seal the primary tank body. The primary tank cover is provided with a solvent inlet, a solid inlet, a vent, a manhole, a steam port, a spare port, and a filter equipment replacement observation port. The solvent inlet is used to add solvent to the primary dissolving tank. The solid inlet is used to add soluble salts to the primary dissolving tank. Soluble salts can be added to the primary dissolving tank through an automatic feeding system. The vent is used for ventilation. For example, ammonia gas with a pungent odor will volatilize during the dissolution of ammonium bicarbonate solids. A ventilation system can be installed at the vent to purify the environment. The manhole is convenient for observation. The steam port is used to introduce steam into the primary dissolving tank (this can be introduced as needed). The spare port is for standby use. The filter equipment replacement observation port is used to replace the filter equipment or observe the use of the filter equipment.

[0034] The height of the overflow hidden pipe is less than the depth of the primary dissolving tank, that is, there is a distance between the top surface of the overflow hidden pipe and the top surface of the primary tank body. The bottom surface of the overflow hidden pipe is arranged on the bottom wall of the primary tank body. A filtering device is arranged on the top of the overflow hidden pipe. The utility model can effectively intercept large pieces of fiber scraps or other mechanical impurities after the packaging bag is broken by arranging the overflow hidden pipe and the filtering device, and reduce the blockage of the pipeline and valve and the wear of the stirring during the dissolution process. In addition, the filtering device can be replaced, which can be easily cleaned.

[0035] In certain embodiments, the filter device is a filter basket. The filter basket includes a basket, a connecting rod and a handle. The basket includes a basket body with an outward curling edge. The curling edge is configured to be stuck on the pipe wall of the overflow concealed pipe, and the basket body is located in the overflow concealed pipe and matches the overflow concealed pipe. The basket body has a filter net. Specifically, the basket body can adopt a 316L stainless steel skeleton and be covered with a 316L stainless steel net. There are two connecting rods, which are vertically arranged on the basket body, and the two connecting rods are evenly distributed. The handle part is connected to the top of the connecting rod. The handle part is located below the observation port for replacing the filter device. There is no special restriction on the shape of the handle part, as long as it is convenient to carry. The handle part can be stuck in the observation port for replacing the filter device. It can ensure that it is stably fixed to the overflow port without moving or deviating, so that it is convenient to replace at any time.

[0036] The stirring device can be a conventional stirring device, which can include a stirring rod, a stirring blade and a control motor. The stirring blade is arranged close to the bottom wall of the first-stage tank body, so that the stirring effect is better.

[0037] Secondary dissolving tank, tertiary dissolving tank, first connecting pipe and second connecting pipe

[0038] The secondary dissolving tank and the tertiary dissolving tank are respectively provided with stirring equipment.

[0039] The lower part of one side of the secondary dissolving tank is connected to the lower part of the overflow blind pipe through a first connecting pipe. The upper part of the other side of the secondary dissolving tank is connected to the upper part of one side of the tertiary dissolving tank through a second connecting pipe.

[0040] In certain specific embodiments, the secondary dissolving tank comprises a secondary tank body and a secondary tank cover; the secondary tank body is configured as a cylindrical structure with an opening at the top. The secondary tank cover is disposed on the secondary tank body and is used to seal the secondary tank body. The tertiary dissolving tank comprises a tertiary tank body and a tertiary tank cover; the tertiary tank body is configured as a cylindrical structure with an opening at the top. The tertiary tank cover is disposed on the tertiary tank body and is used to seal the tertiary tank body. The secondary tank cover is provided with a second vent and a second manhole. The tertiary tank cover is provided with a third vent and a third manhole.

[0041] The three-stage dissolution tank is also equipped with an online concentration detector. This can monitor the concentration of the dissolved soluble salt solution in real time. The online concentration detector is interlocked with the feeding system to adjust the feeding amount of the feeding system according to the concentration change, so as to achieve continuous and stable control. The completely dissolved soluble salt solution is then finely filtered through the basket filter and fiber ball filter.

[0042] According to a specific embodiment of the utility model, the lower part of one side of the secondary tank body is connected to the lower part of the overflow concealed pipe through a first connecting pipe, and the upper part of the other side of the secondary tank body is connected to the upper part of one side of the tertiary tank body through a second connecting pipe.

[0043] <Filter and transfer pump>

[0044] The lower part of the other side of the three-stage dissolving tank is connected to the filter through the third connecting pipe. Specifically, the filter includes a basket filter and a fiber ball filter. The basket filter is connected to the lower part of the three-stage dissolving tank through the third connecting pipe. The fiber ball filter is connected to the basket filter through the transfer pump. By setting the basket filter, small fines can be effectively intercepted, reducing the blockage and wear of the transfer pump. Finally, non-mechanical impurities can be removed through the fiber ball filter to obtain a clean and clear soluble salt solution for use in subsequent processes. In this way, the effect of fine filtration can be achieved and the material transfer efficiency can be improved.

[0045] In the utility model, the fiber ball filter can be backwashed and regenerated, thereby increasing the filtering speed and service life of the equipment.

[0046] The continuous dissolution and purification device of the utility model can give full play to the equipment capacity, improve the equipment utilization rate, adopt sealed tanks and sealed filtering equipment to improve the dissolution site environment, realize continuous production, reduce the amount of intermediate resources occupied, realize the balanced use of steam, and reduce the pressure of energy distribution; it can also cooperate with the automatic feeding metering screw system and flow control system to achieve accurate preparation and stable control of product quality. It can effectively realize the effective filtration and removal of various impurities in the process of continuous dissolution of soluble salts, thereby effectively solving the problems of conventional intermittent dissolution. From the perspective of industry prospects, it can provide technical support for the development of hydrometallurgical enterprises and improve the competitiveness of the industry.

[0047] Example 1

[0048] Figure 1 The utility model is a structural schematic diagram of a continuous dissolution and purification device. Figure 2 for Figure 1 Schematic top view of .

[0049] like Figure 1 and Figure 2 As shown, a continuous dissolution and purification device of this embodiment includes a primary dissolution tank 1, a secondary dissolution tank 2, a tertiary dissolution tank 3, a first connecting pipe 4, a second connecting pipe 5, a third connecting pipe 6, a filter and a material transfer pump 8.

[0050] The primary dissolving tank 1 comprises a primary tank body and a primary tank cover. The primary tank body is provided as a cylindrical structure with an opening at the top. The primary tank cover is provided on the primary tank body for sealing the primary tank body. The primary tank cover is provided with a solvent inlet 101, a solid inlet 102, a vent 103, a stirring port 104, a manhole 105, a steam port 106, a spare port 107, and a filter device replacement observation port 108.

[0051] The primary dissolving tank 1 is provided with an overflow hidden pipe 11, a filtering device 12 and a stirring device. The overflow hidden pipe 11 is arranged close to the inner wall of the primary tank body. The height of the overflow hidden pipe 11 is less than the depth of the primary tank body, that is, the bottom surface of the overflow hidden pipe 11 is connected to the bottom wall of the primary tank body, and there is a distance between the top surface of the overflow hidden pipe 11 and the top surface of the primary tank body. The top of the overflow hidden pipe 11 is provided with a filtering device 12. In this way, larger mechanical impurities and fiber fines on the packaging can be intercepted and filtered.

[0052] The filter device 12 is a filter basket. The filter basket includes a basket, a connecting rod and a handle. The basket includes a basket body with an outward curling edge. The basket body is formed by a filter net covered in a frame. The curling edge is configured to be stuck on the pipe wall of the overflow concealed pipe 11. The basket body is located in the overflow concealed pipe 11 and matches the overflow concealed pipe 11. There are two connecting rods, which are vertically arranged on the basket body. The handle part is connected to the top of the connecting rod. The handle part is located below the filter device replacement observation port 108. There is no special restriction on the shape of the handle part, as long as it is convenient to carry.

[0053] The lower part of one side of the secondary dissolution tank 2 is connected to the lower part of the overflow blind pipe 11 through the first connecting pipe 4. The upper part of the other side of the secondary dissolution tank 2 is connected to the upper part of one side of the tertiary dissolution tank 3 through the second connecting pipe 5. The lower part of the other side of the tertiary dissolution tank 3 is connected to the filter through the third connecting pipe 6. The third connecting pipe 6 and the first connecting pipe 4 are located on the same horizontal plane.

[0054] The secondary dissolving tank 2 includes a secondary tank body and a secondary tank cover. The secondary tank body is a cylindrical structure with an opening at the top. The secondary tank cover is arranged on the secondary tank body and is used to seal the secondary tank body. The secondary tank cover is provided with a second vent and a second manhole. A stirring device is arranged in the secondary dissolving tank.

[0055] The tertiary dissolving tank 3 includes a tertiary tank body and a tertiary tank cover. The tertiary tank body is a cylindrical structure with an opening on the top. The tertiary tank cover is arranged on the tertiary tank body. The tertiary tank cover is provided with a third vent and a third manhole. The tertiary dissolving tank 3 is also provided with an online concentration detector 31. A stirring device is arranged inside the tertiary dissolving tank 3.

[0056] The filter includes a basket filter 71 and a fiber ball filter 72. The basket filter is connected to the lower part of the third-stage dissolving tank 3 through the third connecting pipe 6. The fiber ball filter 72 is connected to the basket filter 71.

[0057] The material transfer pump 8 is arranged between the basket filter 71 and the fiber ball filter 72 .

[0058] The following describes a method for dissolving and purifying ammonium bicarbonate using the continuous dissolution and purification device of the utility model:

[0059] A set amount of solvent water is added to the primary dissolving tank 1 through the solvent inlet 101, and a set amount of ammonium bicarbonate is added to the primary dissolving tank 1 through the solid inlet 102, and the stirring device is turned on for stirring to perform the first step of rough dissolution. The filtering device 12 effectively intercepts the larger mechanical impurities and fiber fines after the soluble salt packaging bag is broken. Then the solution after the first step of rough dissolution flows into the secondary dissolving tank 2 through the overflow dark pipe 11 and the first connecting pipe 4 to continue dissolving; then it flows into the tertiary dissolving tank 3 through the second connecting pipe 5. An online concentration detector 31 is installed on the tertiary dissolving tank 3 to monitor the concentration of the dissolved ammonium bicarbonate solution in real time. The concentration detector is interlocked with the feeding system, and the feeding amount of the feeding system is adjusted according to the change in concentration, so as to achieve continuity and stability control. The completely dissolved ammonium bicarbonate solution is then finely filtered through the basket filter 71 and the fiber ball filter 72. Ammonium bicarbonate fine filtrate is obtained.

[0060] The present invention is not limited to the above-mentioned embodiments. Without departing from the essential content of the present invention, any deformation, improvement, and substitution that can be thought of by those skilled in the art shall fall within the scope of the present invention.

Claims

1. A continuous dissolution and purification device, characterized in that: It includes a primary dissolving tank, a secondary dissolving tank, a tertiary dissolving tank and a filter; An overflow blind pipe is provided in the primary dissolving tank, and a filtering device is provided on the top of the overflow blind pipe; the height of the overflow blind pipe is less than the depth of the primary dissolving tank; The lower part of one side of the secondary dissolution tank is connected to the lower part of the overflow blind pipe through a first connecting pipe; the upper part of the other side of the secondary dissolution tank is connected to the upper part of one side of the tertiary dissolution tank through a second connecting pipe; the lower part of the other side of the tertiary dissolution tank is connected to the filter through a third connecting pipe; The first-stage dissolving tank, the second-stage dissolving tank and the third-stage dissolving tank are all provided with stirring equipment.

2. The continuous dissolution and purification device according to claim 1, characterized in that: The filter comprises a basket filter and a fiber ball filter; the basket filter is connected to the lower part of the three-stage dissolving tank through a third connecting pipe; and the fiber ball filter is connected to the basket filter.

3. The continuous dissolution and purification device according to claim 2, characterized in that: It also includes a material transfer pump, which is arranged between the basket filter and the fiber ball filter.

4. The continuous dissolution and purification device according to claim 1, characterized in that: The primary dissolving tank comprises a primary tank body and a primary tank cover. The primary tank body is configured as a cylindrical structure with an opening at the top. The primary tank cover is configured on the primary tank body and is used to seal the primary tank body.

5. The continuous dissolution and purification device according to claim 4, characterized in that: The first-level tank cover is provided with a solvent inlet, a solid inlet, a vent and a manhole.

6. The continuous dissolution and purification device according to claim 4, characterized in that: The first-level tank cover is also provided with a steam port and a spare port.

7. The continuous dissolution and purification device according to claim 4, characterized in that: The filtering device is a filter basket; the filter basket includes a basket, a connecting rod and a handle; the basket includes a basket body with an outwardly curled edge; the basket body has a filter net; the curled edge is configured to be stuck on the pipe wall of the overflow concealed pipe, and the basket body is configured to be accommodated in the overflow concealed pipe and match the overflow concealed pipe; there are two connecting rods, which are vertically arranged on the basket body; the handle is connected to the top of the connecting rod.

8. The continuous dissolution and purification device according to claim 7, characterized in that: The first-level tank cover is also provided with a filter device replacement observation port; the handle is located below the filter device replacement observation port.

9. The continuous dissolution and purification device according to any one of claims 1 to 8, characterized in that: The secondary dissolving tank comprises a secondary tank body and a secondary tank cover; the secondary tank cover is arranged on the secondary tank body; the tertiary dissolving tank comprises a tertiary tank body and a tertiary tank cover; the tertiary tank cover is arranged on the tertiary tank body; the secondary tank cover and the tertiary tank cover are both provided with ventilation holes and manholes.

10. The continuous dissolution and purification device according to claim 9, characterized in that: The three-stage dissolution tank is also provided with an online concentration detector.

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