System for preparing high-purity rubidium and cesium from lithium precipitation mother liquor

Abstract

The utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, and belongs to the technical field of chemical equipment. The system comprises a primary lithium precipitation mother liquor clear liquid tank, a decarburization kettle, evaporation equipment, a glaserite freezing crystallization kettle, a sodium sulfate freezing crystallization kettle, a secondary lithium precipitation reaction kettle, an extraction subsystem and a back extraction subsystem which are connected in sequence, the decarburization kettle is connected with a concentrated sulfuric acid conveying pipe, the back extraction subsystem is connected with a back extraction liquid conveying line, and a secondary lithium precipitation mother liquid circulating line is connected between the secondary lithium precipitation reaction kettle and the lithium precipitation mother liquid clear liquid tank. The device disclosed by the utility model is scientific in design and simple in structure, can be used for extracting high-purity rare metals rubidium and cesium from the primary lithium precipitation mother liquor, is suitable for industrialization and has good economic value. The sodium sulfate product obtained by the device is high in purity and can be directly sold or used as a raw material to prepare high-purity potassium sulfate with glaserite separated out by freezing.

Description

Technical Field

[0001] The utility model belongs to the technical field of chemical equipment, and specifically relates to a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor. Background Art

[0002] Rubidium and cesium are rare metals with excellent photoelectric properties and chemical activity. They are expensive and have unique uses in various technical fields. They cannot be replaced by other metal elements. Lithium is an important metal element, widely used in batteries, alloys, ceramics and other fields. In addition to lithium, lithium ore also contains other metal elements, such as sodium, potassium, rubidium, cesium, etc. The sulfuric acid method for preparing lithium carbonate is to use sulfuric acid to dissolve the oxides in lithium ore to generate lithium sulfate and obtain acidified clinker. After the acidified clinker is pulped and impurity removed, lithium is precipitated once, and lithium carbonate is obtained after the precipitate is refined. The mother liquor after the first lithium precipitation contains sodium, potassium, rubidium, cesium and other ions in addition to some lithium ions that have not been completely precipitated. If the above substances can be separated from the lithium precipitation mother liquor, it will have excellent economic prospects.

[0003] Therefore, how to obtain high-purity rubidium salts and cesium salts from primary lithium precipitation mother liquor and realize resource utilization has become an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0004] The utility model aims to provide a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, which can extract high-purity rare metal rubidium and cesium from lithium precipitation mother liquor.

[0005] The technical solution adopted by the utility model is as follows:

[0006] The utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, comprising a primary lithium precipitation mother liquor clear liquid tank, a decarbonization kettle, an evaporation device, a potassium glauberite freezing crystallization kettle, a sodium sulfate freezing crystallization kettle, a secondary lithium precipitation reaction kettle, an extraction subsystem, and a back extraction subsystem connected in sequence;

[0007] The decarbonization kettle is connected to a concentrated sulfuric acid delivery pipe, and the stripping subsystem is connected to a stripping liquid delivery line;

[0008] A secondary lithium precipitation mother liquor circulation conveying line is connected between the secondary lithium precipitation reaction kettle and the lithium precipitation mother liquor clear liquid tank, and is used to circulate the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank.

[0009] Furthermore, the secondary lithium precipitation reactor is connected to a sodium carbonate conveying line for feeding sodium carbonate into the secondary lithium precipitation reactor for secondary lithium precipitation.

[0010] Furthermore, the extraction subsystem is connected to an extractant input line, and the extraction subsystem is used for extracting rivets and absolute in the secondary lithium precipitation mother liquor.

[0011] Furthermore, the stripping subsystem is connected to a dilute sulfuric acid delivery line, which is connected to an extractant circulation line, which is connected to the extraction subsystem. The stripping subsystem is used to strip out the rivets and absolute extracted by the extraction subsystem with dilute sulfuric acid.

[0012] Furthermore, the lithium precipitation mother liquor clear liquid tank is connected to the decarbonization kettle via a primary lithium precipitation mother liquor conveying line.

[0013] The decarbonization kettle is connected to the evaporation equipment via the decarbonization mother liquor conveying line.

[0014] The evaporation equipment is connected to the potassium sulfate freezing crystallization kettle through the concentrated mother liquor conveying line.

[0015] The potassium glauberite freezing crystallization kettle is connected with the sodium sulfate freezing crystallization kettle through the potassium mother liquor conveying line.

[0016] The sodium sulfate freezing crystallization kettle is connected to the secondary lithium precipitation reactor via the sodium precipitation mother liquor conveying line.

[0017] The secondary lithium precipitation reactor is connected to the extraction subsystem via the secondary lithium precipitation mother liquor conveying line.

[0018] The extraction subsystem is connected to the back-extraction subsystem via an extraction liquid delivery line.

[0019] Furthermore, it also includes a concentration and crystallization subsystem connected to the stripping subsystem.

[0020] Furthermore, the stripping subsystem is connected to the concentration crystallization subsystem via a stripping liquid delivery line.

[0021] Furthermore, it also includes a drying system connected from the concentration and crystallization subsystem,

[0022] The concentrated crystallization subsystem is connected to the drying system via a concentrated crystallization material conveying line, and the drying system is connected to an external transmission line for rubidium sulfate and cesium sulfate products.

[0023] Furthermore, the glauberite freezing crystallization kettle is connected to a glauberite transmission line;

[0024] The sodium sulfate freezing crystallization kettle is connected to a sodium sulfate transmission line.

[0025] Compared with the prior art, the utility model has the following beneficial effects:

[0026] The utility model has the advantages of scientific design and simple structure. The utility model can be used to extract high-purity rare metal rubidium and cesium from a primary lithium precipitation mother liquor, is suitable for industrial application, and has good economic value.

[0027] In the utility model, a decarbonization kettle and an evaporation device are used to decarbonize and evaporate the primary lithium precipitation mother liquor, the concentrated mother liquor is frozen in a glauber's salt freezing crystallization kettle to precipitate glauber's salt, the potassium precipitation mother liquor is then frozen in a sodium sulfate freezing crystallization kettle to precipitate sodium, the sodium precipitation mother liquor is extracted with an extractant, and then back-extracted with dilute sulfuric acid to obtain high-purity rubidium sulfate and cesium sulfate solutions. The rubidium sulfate and cesium sulfate solutions are then frozen, crystallized, and dried to obtain rubidium sulfate and cesium sulfate products.

[0028] The sodium sulfate product obtained by the utility model has high purity and can be directly sold or used as a raw material to prepare high-purity potassium sulfate with frozen precipitated glauberite. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Attached Figure 1 This is a system structure diagram of the utility model.

[0030] The names corresponding to the reference numerals are:

[0031] 1-primary lithium precipitation mother liquor clear liquid tank, 2-decarbonization kettle, 3-evaporation equipment, 4-glauberite freezing crystallization kettle, 5-sodium sulfate freezing crystallization kettle, 6-extraction subsystem, 7-back extraction subsystem, 8-concentration crystallization subsystem, 9-drying system, 10-secondary lithium precipitation reaction kettle;

[0032] 101-primary lithium precipitation mother liquor conveying line, 102-concentrated sulfuric acid conveying pipe, 103-decarbonization mother liquor conveying line, 104-concentrated mother liquor conveying line, 105-potassium precipitation mother liquor conveying line, 106-glauberite external transmission line, 107-sodium precipitation mother liquor conveying line, 108-sodium sulfate external transmission line, 109-extracting liquid conveying line, 110-extracting agent input line, 111-dilute sulfuric acid conveying line, 112-extracting agent circulation line, 113-back-extracting liquid conveying line, 114-concentrated crystallization material conveying line, 115-rubidium sulfate and cesium sulfate product external transmission line, 116-secondary lithium precipitation mother liquor circulation line, 117-secondary lithium precipitation mother liquor conveying line, 118-sodium carbonate conveying line. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. 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 making creative work are within the scope of protection of the utility model.

[0034] Example 1.

[0035] As attached Figure 1As shown, the utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, comprising a primary lithium precipitation mother liquor clear liquid tank 1, a decarbonization kettle 2, an evaporation device 3, a potassium glauberite freezing crystallization kettle 4, a sodium sulfate freezing crystallization kettle 5, a secondary lithium precipitation reaction kettle 10, an extraction subsystem 6, and a back extraction subsystem 7 connected in sequence;

[0036] The decarbonization kettle 2 is connected to a concentrated sulfuric acid delivery pipe 102, and the stripping subsystem 7 is connected to a stripping liquid delivery line 113. The evaporation equipment 3 is an MVR evaporator.

[0037] A secondary lithium precipitation mother liquor circulation line 116 is connected between the secondary lithium precipitation reaction kettle 10 and the lithium precipitation mother liquor clear liquid tank 1 for circulating the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank 1 .

[0038] In the utility model, a decarbonization kettle and an evaporation device are used to decarbonize, evaporate and concentrate the primary lithium precipitation mother liquor. The concentrated mother liquor is frozen in a potassium sulfate freezing crystallization kettle to precipitate potassium sulfate. The potassium precipitation mother liquor is then frozen in a sodium sulfate freezing crystallization kettle to precipitate sodium. After the sodium precipitation mother liquor is subjected to secondary lithium precipitation, the secondary lithium precipitation mother liquor is circulated back to the lithium precipitation mother liquor clear liquid tank, and the above steps are repeated. When the rubidium and cesium in the secondary lithium precipitation mother liquor reach a certain concentration, it enters the extraction subsystem, is extracted with an extractant, and then back-extracted with dilute sulfuric acid to obtain high-purity rubidium sulfate and cesium sulfate solutions. The utility model has a scientific design and a simple structure. It can extract high-purity rare metal rubidium and cesium from the primary lithium precipitation mother liquor. It is suitable for industrial application and has good economic value.

[0039] Example 2.

[0040] As attached Figure 1 As shown, the utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, comprising a primary lithium precipitation mother liquor clear liquid tank 1, a decarbonization kettle 2, an evaporation device 3, a potassium glauberite freezing crystallization kettle 4, a sodium sulfate freezing crystallization kettle 5, a secondary lithium precipitation reaction kettle 10, an extraction subsystem 6, and a back-extraction subsystem 7, which are connected in sequence; the evaporation device 3 is an MVR evaporator.

[0041] The decarbonization kettle 2 is connected to a concentrated sulfuric acid delivery pipe 102 .

[0042] A secondary lithium precipitation mother liquor circulation line 116 is connected between the secondary lithium precipitation reaction kettle 10 and the lithium precipitation mother liquor clear liquid tank 1 for circulating the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank 1 .

[0043] The secondary lithium precipitation reaction kettle 10 is connected to a sodium carbonate conveying line 118 for conveying sodium carbonate into the secondary lithium precipitation reaction kettle 10 for secondary lithium precipitation.

[0044] The extraction subsystem 6 is connected to an extractant input line 110. The stripping subsystem 7 is connected to a dilute sulfuric acid delivery line 111, and is connected to an extractant circulation line 112 and a stripping liquid delivery line 113. The extractant circulation line 112 is connected to the extraction subsystem 6.

[0045] This embodiment 2 provides a more preferred structure of the extraction subsystem and the back-extraction subsystem 7 based on the embodiment 1. Specifically, the extraction subsystem 6 is connected to an extractant input line 110 .

[0046] The stripping subsystem 7 is connected to a dilute sulfuric acid delivery line 111, and is connected to an extractant circulation line 112 and a stripping liquid delivery line 113. The extractant circulation line 112 is connected to the extraction subsystem 6 to realize the recycling of the extractant.

[0047] Example 3.

[0048] As attached Figure 1 As shown, the utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, comprising a primary lithium precipitation mother liquor clear liquid tank 1, a decarbonization kettle 2, an evaporation device 3, a potassium glauberite freezing crystallization kettle 4, a sodium sulfate freezing crystallization kettle 5, a secondary lithium precipitation reaction kettle 10, an extraction subsystem 6, and a back-extraction subsystem 7, which are connected in sequence; the evaporation device 3 is an MVR evaporator.

[0049] The decarbonization kettle 2 is connected to a concentrated sulfuric acid delivery pipe 102.

[0050] A secondary lithium precipitation mother liquor circulation line 116 is connected between the secondary lithium precipitation reactor 10 and the lithium precipitation mother liquor clear liquid tank 1, which is used to circulate the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank 1. The secondary lithium precipitation reactor 10 is connected to a sodium carbonate delivery line 118, which is used to deliver sodium carbonate into the secondary lithium precipitation reactor 10 for secondary lithium precipitation.

[0051] The extraction subsystem 6 is connected to an extractant input line 110 .

[0052] The stripping subsystem 7 is connected to a dilute sulfuric acid delivery line 111 , and is connected to an extractant circulation line 112 and a stripping liquid delivery line 113 . The extractant circulation line 112 is connected to the extraction subsystem 6 .

[0053] The lithium precipitation mother liquor clear liquid tank 1 is connected to the decarbonization kettle 2 via the primary lithium precipitation mother liquor conveying line 101.

[0054] The decarbonization kettle 2 is connected to the evaporation equipment 3 via the decarbonization mother liquid conveying line 103.

[0055] The evaporation equipment 3 is connected to the potassium sulfate freezing crystallization kettle 4 via the concentrated mother liquor conveying line 104.

[0056] The potassium sulfate freezing crystallization kettle 4 is connected to the sodium sulfate freezing crystallization kettle 5 via the potassium separation mother liquor conveying line 105.

[0057] The sodium sulfate freezing crystallization kettle 5 is connected to the extraction subsystem 6 via the sodium precipitate mother liquor conveying line 107.

[0058] The extraction subsystem 6 is connected to the stripping subsystem 7 via an extraction liquid delivery line 109 .

[0059] The glauberite freezing crystallization kettle 4 is connected to a glauberite external transmission line 106;

[0060] The sodium sulfate freezing crystallization kettle 5 is connected to a sodium sulfate transmission line 108.

[0061] This embodiment 3 provides a more preferred structure of the present system on the basis of embodiment 2. Specifically: the lithium precipitation mother liquor clear liquid tank 1 is connected to the decarbonization kettle 2 via a primary lithium precipitation mother liquor delivery line 101, the decarbonization kettle 2 is connected to the evaporation equipment 3 via a decarbonization mother liquor delivery line 103, the evaporation equipment 3 is connected to the glauberite freezing crystallization kettle 4 via a concentrated mother liquor delivery line 104, the glauberite freezing crystallization kettle 4 is connected to the sodium sulfate freezing crystallization kettle 5 via a potassium precipitation mother liquor delivery line 105, the sodium sulfate freezing crystallization kettle 5 is connected to the extraction subsystem 6 via a sodium precipitation mother liquor delivery line 107, and the extraction subsystem 6 is connected to the back extraction subsystem 7 via an extract delivery line 109; the glauberite freezing crystallization kettle 4 is connected to a glauberite external delivery line 106; the sodium sulfate freezing crystallization kettle 5 is connected to a sodium sulfate external delivery line 108.

[0062] Example 4.

[0063] As attached Figure 1 As shown, the utility model discloses a system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, comprising a primary lithium precipitation mother liquor clear liquid tank 1, a decarbonization kettle 2, an evaporation device 3, a potassium glauberite freezing crystallization kettle 4, a sodium sulfate freezing crystallization kettle 5, a secondary lithium precipitation reaction kettle 10, an extraction subsystem 6, a back extraction subsystem 7, a concentration crystallization subsystem 8 and a drying system 9, which are sequentially connected. The evaporation device 3 is an MVR evaporator.

[0064] The decarbonization kettle 2 is connected to a concentrated sulfuric acid delivery pipe 102 .

[0065] A secondary lithium precipitation mother liquor circulation line 116 is connected between the secondary lithium precipitation reaction kettle 10 and the lithium precipitation mother liquor clear liquid tank 1 for circulating the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank 1 .

[0066] The secondary lithium precipitation reaction kettle 10 is connected to a sodium carbonate conveying line 118 for conveying sodium carbonate into the secondary lithium precipitation reaction kettle 10 for secondary lithium precipitation.

[0067] The extraction subsystem 6 is connected to an extractant input line 110 .

[0068] The stripping subsystem 7 is connected to a dilute sulfuric acid delivery line 111 , and is connected to an extractant circulation line 112 and a stripping liquid delivery line 113 . The extractant circulation line 112 is connected to the extraction subsystem 6 .

[0069] The lithium precipitation mother liquor clear liquid tank 1 is connected to the decarbonization kettle 2 via the primary lithium precipitation mother liquor conveying line 101.

[0070] The decarbonization kettle 2 is connected to the evaporation equipment 3 via the decarbonization mother liquid conveying line 103.

[0071] The evaporation equipment 3 is connected to the potassium sulfate freezing crystallization kettle 4 via the concentrated mother liquor conveying line 104.

[0072] The potassium sulfate freezing crystallization kettle 4 is connected to the sodium sulfate freezing crystallization kettle 5 via the potassium separation mother liquor conveying line 105.

[0073] The sodium sulfate freezing crystallization kettle 5 is connected to the secondary lithium precipitation reaction kettle 10 via the sodium precipitation mother liquor conveying line 107.

[0074] The secondary lithium precipitation reaction kettle 10 is connected to the extraction subsystem 6 via the secondary lithium precipitation mother liquor conveying line 117.

[0075] The extraction subsystem 6 is connected to the stripping subsystem 7 via an extraction liquid delivery line 109 .

[0076] The stripping subsystem 7 is connected to the concentration crystallization subsystem 8 via the stripping liquid delivery line 113 .

[0077] The concentrated crystallization subsystem 8 is connected to the drying system 9 via a concentrated crystallization material conveying line 114, and the drying system is connected to a rubidium sulfate and cesium sulfate product external conveying line 115.

[0078] The glauberite freezing crystallization kettle 4 is connected to a glauberite external transmission line 106;

[0079] The sodium sulfate freezing crystallization kettle 5 is connected to a sodium sulfate transmission line 108.

[0080] This embodiment 4 provides a more preferred structure based on embodiment 3, specifically: the utility model also includes a concentrated crystallization subsystem 8 and a drying system 9. The stripping subsystem 7 is connected to the concentrated crystallization subsystem 8 via a stripping liquid delivery line 113. The concentrated crystallization subsystem 8 is connected to the drying system 9 via a concentrated crystallization material delivery line 114, and the drying system is connected to a rubidium sulfate and cesium sulfate product delivery line 115.

[0081] The method for extracting rubidium and cesium from lithium precipitation mother liquor by using the utility model is specifically as follows:

[0082] S1. The mother liquor of lithium precipitate is firstly precipitated into the decarbonization kettle by the clear liquid tank of lithium precipitate, and the decarbonization reaction is carried out with the addition of sulfuric acid solution in the decarbonization kettle, and then the mother liquor is concentrated by evaporation into the evaporation equipment to obtain a concentrated mother liquor;

[0083] The raw material primary lithium precipitation mother liquor is a flash lithium precipitation mother liquor produced by the sulfuric acid process to produce lithium carbonate, wherein the lithium sulfate content is less than or equal to 7wt.%, the sodium sulfate content is 5-27wt.%, and the potassium sulfate content is 8-19wt.%.

[0084] S2. The concentrated mother liquor is sent to a glauberite freezing crystallization kettle, cooled to 25°C ± 5°C, glauberite is precipitated, and the glauberite is sent out of the boundary; the potassium mother liquor is sent to a sodium sulfate freezing crystallization kettle;

[0085] S3. The potassium precipitation mother liquor is cooled to ≤0°C in a sodium sulfate freezing crystallization kettle, sodium sulfate is precipitated, and the sodium sulfate is sent out of the boundary; the sodium precipitation mother liquor enters a secondary lithium precipitation reactor;

[0086] S4. The sodium precipitation mother liquor reacts with sodium carbonate in a secondary lithium precipitation reactor to generate lithium carbonate precipitate;

[0087] The secondary lithium precipitation mother liquor is circulated back to the primary lithium precipitation clear liquor tank and combined with the primary lithium precipitation mother liquor, and steps S1-S4 are circulated; the precipitate in the secondary lithium precipitation reactor is centrifuged, dehydrated and dried to obtain crude lithium carbonate;

[0088] S5. When the contents of rubidium and cesium in the secondary lithium precipitation mother liquor are greater than or equal to 2 mg / L, enter the extraction subsystem for the extraction process, add an extractant for extracting rubidium and cesium to the secondary lithium precipitation mother liquor, separate, and send the organic layer as the extractant to the back-extraction subsystem; the water layer is collected and used as the extraction replenishment liquid; the extractant is a mixed solution of 4-tert-butyl-2-(α-benzyl) phenol and cyclohexane, wherein the concentration of 4-tert-butyl-2-(α-benzyl) phenol is 1.0 mol / L; the volume ratio of the extractant to the secondary lithium precipitation mother liquor is 1:1;

[0089] S5. The extract is extracted with 1 mol / L sulfuric acid solution in the back-extraction subsystem, and the volume ratio of sulfuric acid solution to extract is 0.2:1. The aqueous layer and the organic layer are separated, and the organic layer is returned to the extraction subsystem as an extractant, and the aqueous layer is sent to the concentration and crystallization subsystem;

[0090] S6. After the aqueous solution layer is concentrated and crystallized in the concentration and crystallization subsystem, it is sent to the drying system for drying, and finally rubidium sulfate and cesium sulfate products are obtained. The impurity content in the rubidium sulfate and cesium sulfate products is less than 1wt%.

[0091] In some embodiments of the utility model, high-purity potassium sulfate is prepared using the glauberite obtained in step S2 and the sodium sulfate obtained in step S3, and the steps are:

[0092] Step A. adding potassium chloride solution to sodium sulfate, heating reaction to generate glauberite and sodium chloride, then cooling the reactant to -5 to 0°C, crystallizing to separate glauberite, and then evaporating crystals to separate sodium chloride;

[0093] Step B. Combine the glauberite obtained in step S2 and step A, add potassium chloride solution to react, and generate potassium sulfate and sodium chloride; cool to -5 to 0°C, crystallize and separate potassium sulfate, and then evaporate and crystallize to separate sodium chloride.

[0094] Finally, it should be noted that the above embodiments are only preferred embodiments of the utility model to illustrate the technical solution of the utility model, but not to limit it, and certainly not to limit the patent scope of the utility model. Any changes or modifications that are made to the main design concept and spirit of the utility model without any substantial meaning, and the technical problems they solve are still consistent with the utility model, should be included in the protection scope of the utility model; in addition, the direct or indirect application of the technical solution of the utility model in other related technical fields is also included in the patent protection scope of the utility model.

Claims

1. A system for preparing high-purity rubidium and cesium from lithium precipitation mother liquor, characterized in that: The invention comprises a primary lithium precipitation mother liquor clear liquid tank (1), a decarbonization kettle (2), an evaporation device (3), a potassium sulfate freezing crystallization kettle (4), a sodium sulfate freezing crystallization kettle (5), a secondary lithium precipitation reaction kettle (10), an extraction subsystem (6), and a back extraction subsystem (7) which are connected in sequence; The decarbonization kettle (2) is connected to a concentrated sulfuric acid delivery pipe (102), and the stripping subsystem (7) is connected to a stripping liquid delivery line (113). A secondary lithium precipitation mother liquor circulation line (116) is connected between the secondary lithium precipitation reaction kettle (10) and the lithium precipitation mother liquor clear liquid tank (1) for circulating the secondary lithium precipitation mother liquor back to the lithium precipitation mother liquor clear liquid tank (1).

2. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1, characterized in that: The secondary lithium precipitation reaction kettle (10) is connected to a sodium carbonate conveying line (118) for conveying sodium carbonate into the secondary lithium precipitation reaction kettle (10) for secondary lithium precipitation.

3. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1, characterized in that: The extraction subsystem (6) is connected to an extractant input line (110), and the extraction subsystem (6) is used to extract rubidium and cesium from the secondary lithium precipitation mother liquor.

4. A system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1 or 2, characterized in that: The stripping subsystem (7) is connected to a dilute sulfuric acid delivery line (111), and is connected to an extractant circulation line (112). The extractant circulation line (112) is connected to the extraction subsystem (6). The stripping subsystem (7) is used to strip out the rubidium and cesium extracted by the extraction subsystem (6) using dilute sulfuric acid.

5. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1, characterized in that: The lithium precipitation mother liquor clearing tank (1) is connected to the decarbonization kettle (2) via a primary lithium precipitation mother liquor conveying line (101). The decarbonization kettle (2) is connected to the evaporation equipment (3) via a decarbonization mother liquid conveying line (103). The evaporation equipment (3) is connected to the potassium sulfate freezing crystallization kettle (4) via a concentrated mother liquor conveying line (104). The potassium sulfate freezing crystallization kettle (4) is connected to the sodium sulfate freezing crystallization kettle (5) via a potassium precipitation mother liquor conveying line (105). The sodium sulfate freezing crystallization kettle (5) is connected to the secondary lithium precipitation reaction kettle (10) via a sodium precipitation mother liquor conveying line (107). The secondary lithium precipitation reaction kettle (10) is connected to the extraction subsystem (6) via a secondary lithium precipitation mother liquor conveying line (117). The extraction subsystem (6) is connected to the stripping subsystem (7) via an extraction liquid delivery line (109).

6. A system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1 or 2, characterized in that: It also includes a concentration crystallization subsystem (8) connected from the stripping subsystem (7).

7. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 6, characterized in that: The stripping subsystem (7) is connected to the concentration crystallization subsystem (8) via a stripping liquid delivery line (113).

8. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 4, characterized in that: It also includes a drying system (9) connected from the concentration and crystallization subsystem (8); The concentrated crystallization subsystem (8) is connected to the drying system (9) via a concentrated crystallization material conveying line (114), and the drying system is connected to a rubidium sulfate and cesium sulfate product conveying line (115).

9. The system for preparing high-purity rubidium and cesium from lithium precipitation mother solution according to claim 1, characterized in that: The glauberite freezing crystallization kettle (4) is connected to a glauberite transmission line (106); The sodium sulfate freezing crystallization kettle (5) is connected to a sodium sulfate transmission line (108).

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