Rare earth recovery device for rare earth wastewater solution

Abstract

The utility model discloses a rare earth recovery device for a rare earth wastewater solution, and belongs to the technical field of rare earth production. Comprising a cooling box, a precipitation barrel is arranged in an inner cavity of the cooling box, the upper portion of the precipitation barrel and a lower inner cavity of the cooling box are sealed through a sealing plate, an opening of the precipitation barrel is communicated with an upper inner cavity of the cooling box, a feeding pipe and a discharging pipe are symmetrically arranged on the upper portion of the cooling box, and the feeding pipe is communicated with the side wall of the middle of the precipitation barrel; the discharging pipes are communicated with the inner cavities of the upper portions of the cooling boxes, and the discharging pipe of any cooling box is communicated with the feeding pipe of the adjacent cooling box. The precipitation cylinder is arranged in the cooling box, so that the rare earth wastewater can be quickly cooled, the crystallization of praseodymium neodymium oxalate in the rare earth wastewater is accelerated, and the recovery of praseodymium neodymium oxalate is accelerated. In addition, the filter screen disc filters praseodymium neodymium oxalate crystals, excessive filtered praseodymium neodymium oxalate crystals are prevented from entering the next cooling box, praseodymium neodymium oxalate is recycled through the multiple cooling boxes, and waste of praseodymium neodymium oxalate is prevented.

Description

Technical Field

[0001] The utility model relates to a rare earth recovery device for rare earth wastewater solution, belonging to the technical field of rare earth production. Background Art

[0002] The rare earth extraction and separation process can be divided into three aspects, namely, pre-treatment of the feed liquid, solvent extraction and separation process, and product finishing and post-treatment. The feed liquid pre-treatment is to put the concentrate into sulfuric acid for acid leaching, and then dissolve, separate, purify, concentrate or burn to make various mixed rare earth compound products; solvent extraction separation is to separate, enrich and extract the mixed rare earth solution to obtain the rare earth products with the required purity and yield; post-treatment is to obtain the final solid product, i.e. rare earth oxide, through precipitation, filtration, roasting and other processes of the single rare earth product obtained in the extraction and separation process.

[0003] During the rare earth production process, the wastewater generated by the oxalic acid precipitation process contains praseodymium and neodymium oxalate. Normal discharge will cause a waste of praseodymium and neodymium oxalate resources. The existing process for recovering praseodymium and neodymium oxalate mostly uses a sedimentation box for cooling and crystallization, and the recovery efficiency is low. In addition, after the crystallization of praseodymium and neodymium oxalate, there is still a certain amount of praseodymium and neodymium oxalate solution in the residual rare earth wastewater on the top of the sedimentation box, and direct discharge will cause a waste of resources.

[0004] In summary, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0005] The technical problem to be solved by the utility model is to provide a rare earth recovery device for rare earth wastewater solution with high recovery efficiency and capable of recovering praseodymium-neodymium oxalate crystals for multiple times in view of the above shortcomings.

[0006] An optimization scheme, a rare earth recovery device for a rare earth wastewater solution, comprises a cooling box, a plurality of cooling boxes are provided, and the plurality of cooling boxes are arranged in series in sequence, a sedimentation cylinder is provided in the inner cavity of the cooling box, the upper part of the sedimentation cylinder is sealed with the lower inner cavity of the cooling box through a sealing plate, the mouth of the sedimentation cylinder is connected to the upper inner cavity of the cooling box, a feed pipe and a discharge pipe are symmetrically provided on the upper part of the cooling box, the feed pipe is connected to the middle side wall of the sedimentation cylinder, the discharge pipe is connected to the upper inner cavity of the cooling box, and the discharge pipe of any cooling box is connected to the feed pipe of the adjacent cooling box.

[0007] Furthermore, a filter screen is fixedly provided on the upper part of the inner cavity of the sedimentation cylinder, and the filter screen is arranged on the upper part of the connection position between the feed pipe and the sedimentation cylinder.

[0008] Furthermore, a motor is provided on the upper part of the cooling box, the motor is connected to a rotating shaft, and a plurality of evenly distributed scrapers are provided on the lower part of the rotating shaft, and the scrapers are fitted on the upper and lower surfaces of the filter screen.

[0009] Furthermore, the filter screen disc and the rotating shaft are rotatably arranged through a bearing.

[0010] Furthermore, the bottom wall of the sedimentation cylinder is arranged on the upper part of the bottom wall of the inner cavity of the cooling box, a sedimentation discharge pipe is provided at the bottom of the sedimentation cylinder, the end of the sedimentation discharge pipe is arranged on the outside of the bottom wall of the cooling box, and a valve is provided at the end of the sedimentation discharge pipe.

[0011] Furthermore, a water inlet pipe is provided on one side wall of the cooling box, and a water outlet pipe is provided on the other side wall of the cooling box, and the side walls provided with the water inlet pipe and the water outlet pipe are arranged opposite to each other.

[0012] Furthermore, the water inlet pipe is arranged at the lower part of the side wall of the cooling box, and the water outlet pipe is arranged at the upper part of the side wall of the cooling box.

[0013] Compared with the prior art, the utility model has the following advantages after adopting the above technical solution:

[0014] The sedimentation cylinder is placed in the cooling box, which can quickly cool the rare earth wastewater, accelerate the crystallization of praseodymium and neodymium oxalate in the rare earth wastewater, and then accelerate the recovery of praseodymium and neodymium oxalate. In addition, the filter plate filters the praseodymium and neodymium oxalate crystals to prevent too many filtered praseodymium and neodymium oxalate crystals from entering the next cooling box. The praseodymium and neodymium oxalate are recovered through multiple cooling boxes to prevent the waste of praseodymium and neodymium oxalate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of a rare earth recovery device for rare earth wastewater solution of the utility model;

[0016] Figure 2 It is a cross-sectional structural schematic diagram of a rare earth recovery device for rare earth wastewater solution of the utility model;

[0017] In the figure, 1-cooling box, 2-sedimentation cylinder, 3-sealing plate, 4-feed pipe, 5-discharge pipe, 6-filter screen, 7-motor, 8-rotating shaft, 9-scraper, 10-sedimentation discharge pipe, 11-valve, 12-water inlet pipe, 13-water outlet pipe. DETAILED DESCRIPTION

[0018] In order to have a clearer understanding of the technical features, purposes and effects of the utility model, the specific implementation methods of the utility model are now described with reference to the accompanying drawings.

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "top surface", "bottom surface" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the positions or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0021] Examples, such as Figure 1 and 2 As shown, the utility model provides a rare earth recovery device for a rare earth wastewater solution, comprising a cooling box 1, wherein a plurality of cooling boxes 1 are provided, and the plurality of cooling boxes 1 are sequentially arranged in series, a sedimentation cylinder 2 is provided in the inner cavity of the cooling box 1, the upper portion of the sedimentation cylinder 2 is sealed with the lower inner cavity of the cooling box 1 through a sealing plate 3, the mouth of the sedimentation cylinder 2 is connected with the upper inner cavity of the cooling box 1, a feed pipe 4 and a discharge pipe 5 are symmetrically provided on the upper portion of the cooling box 1, the feed pipe 4 is connected with the middle side wall of the sedimentation cylinder 2, the discharge pipe 5 is connected with the upper inner cavity of the cooling box 1, and the discharge pipe 5 of any cooling box 1 is connected with the feed pipe 4 of the adjacent cooling box 1.

[0022] A filter screen 6 is fixedly provided on the upper part of the inner cavity of the sedimentation cylinder 2 , and the filter screen 6 is arranged on the upper part of the connection position between the feed pipe 4 and the sedimentation cylinder 2 .

[0023] The cooling box 1 is provided with a motor 7 at the top, the motor 7 is connected with a rotating shaft 8, and a plurality of evenly distributed scrapers 9 are provided at the bottom of the rotating shaft 8, and the scrapers 9 are fitted on the upper and lower surfaces of the filter screen plate 6.

[0024] The filter screen plate 6 and the rotating shaft 8 are rotatably arranged through a bearing.

[0025] The bottom wall of the sedimentation cylinder 2 is arranged on the upper part of the bottom wall of the inner cavity of the cooling box 1, and a sedimentation discharge pipe 10 is arranged at the bottom of the sedimentation cylinder 2. The end of the sedimentation discharge pipe 10 is arranged on the outer side of the bottom wall of the cooling box 1, and a valve 11 is arranged at the end of the sedimentation discharge pipe 10.

[0026] A water inlet pipe 12 is disposed on one side wall of the cooling box 1, and a water outlet pipe 13 is disposed on the other side wall of the cooling box 1. The side walls provided with the water inlet pipe 12 and the water outlet pipe 13 are arranged opposite to each other.

[0027] The water inlet pipe 12 is arranged at the lower part of the side wall of the cooling box 1 , and the water outlet pipe 13 is arranged at the upper part of the side wall of the cooling box 1 .

[0028] The water outlet pipe 13 of any cooling box 1 is connected to the water inlet pipe 12 of the adjacent cooling box 1 .

[0029] The working principle of this utility model:

[0030] After multiple cooling boxes 1 are connected in series, the water inlet pipe 12 of the first cooling box 1 is connected to cooling water, and the feed pipe 4 of the first cooling box 1 is connected to rare earth wastewater, and the rare earth wastewater enters the sedimentation tube 2. The cooling water cools the rare earth wastewater in the sedimentation tube 2. After cooling, the praseodymium-neodymium oxalate crystals in the rare earth wastewater are precipitated at the bottom of the sedimentation tube. When the feed pipe 4 is connected to the rare earth wastewater, a water flow is generated, which drives part of the praseodymium-neodymium oxalate crystals to move, and the filter screen 6 It can block the movement of praseodymium-neodymium oxalate crystals. The motor 7 drives the scraper 9 to rotate, cleans the praseodymium-neodymium oxalate crystals attached to the surface of the filter mesh plate 6, and prevents the praseodymium-neodymium oxalate crystals from clogging the filter mesh plate 6. Some of the praseodymium-neodymium oxalate crystals enter the next adjacent cooling box 1 through the discharge pipe 5. The adjacent cooling box 1 repeats the above operation to cool and precipitate the rare earth wastewater. The valve 11 is opened, and the praseodymium-neodymium oxalate crystals precipitated in the precipitation cylinder 2 are discharged through the precipitation discharge pipe 10.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or device. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the article or device including the above elements.

[0032] This article uses specific examples to illustrate the principles and implementation methods of the utility model. The above examples are only used to help understand the core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A rare earth recovery device for rare earth wastewater solution, characterized in that: The invention comprises a cooling box (1), wherein a plurality of cooling boxes (1) are provided, and the plurality of cooling boxes (1) are arranged in series in sequence. A settling cylinder (2) is provided in the inner cavity of the cooling box (1), and the upper portion of the settling cylinder (2) is sealed with the lower inner cavity of the cooling box (1) through a sealing plate (3). The mouth of the settling cylinder (2) is connected to the upper inner cavity of the cooling box (1). A feed pipe (4) and a discharge pipe (5) are symmetrically provided on the upper portion of the cooling box (1). The feed pipe (4) is connected to the middle side wall of the settling cylinder (2), and the discharge pipe (5) is connected to the upper inner cavity of the cooling box (1). The discharge pipe (5) of any cooling box (1) is connected to the feed pipe (4) of the adjacent cooling box (1).

2. A rare earth recovery device for rare earth wastewater solution according to claim 1, characterized in that: A filter screen (6) is fixedly provided at the upper portion of the inner cavity of the sedimentation cylinder (2), and the filter screen (6) is arranged at the upper portion of the connection position between the feed pipe (4) and the sedimentation cylinder (2).

3. A rare earth recovery device for rare earth wastewater solution according to claim 2, characterized in that: The upper part of the cooling box (1) is provided with a motor (7), the motor (7) is connected to a rotating shaft (8), and the lower part of the rotating shaft (8) is provided with a plurality of evenly distributed scrapers (9), and the scrapers (9) are fitted on the upper and lower surfaces of the filter screen (6).

4. A rare earth recovery device for rare earth wastewater solution according to claim 2, characterized in that: The filter screen plate (6) and the rotating shaft (8) are rotatably arranged through a bearing.

5. A rare earth recovery device for rare earth wastewater solution according to claim 1, characterized in that: The bottom wall of the sedimentation cylinder (2) is arranged on the upper part of the bottom wall of the inner cavity of the cooling box (1), a sedimentation discharge pipe (10) is arranged at the bottom of the sedimentation cylinder (2), the end of the sedimentation discharge pipe (10) is arranged on the outside of the bottom wall of the cooling box (1), and a valve (11) is arranged at the end of the sedimentation discharge pipe (10).

6. A rare earth recovery device for rare earth wastewater solution according to claim 1, characterized in that: A water inlet pipe (12) is provided on one side wall of the cooling box (1), and a water outlet pipe (13) is provided on the other side wall of the cooling box (1), and the side walls provided with the water inlet pipe (12) and the water outlet pipe (13) are arranged opposite to each other.

7. A rare earth recovery device for rare earth wastewater solution according to claim 6, characterized in that: The water inlet pipe (12) is arranged at the lower part of the side wall of the cooling box (1), and the water outlet pipe (13) is arranged at the upper part of the side wall of the cooling box (1).

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