CN114590826B - Treatment process and equipment for potassium-rich mother liquor of lithium hydroxide production system - Google Patents
Treatment process and equipment for potassium-rich mother liquor of lithium hydroxide production system Download PDFInfo
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- CN114590826B CN114590826B CN202210404928.0A CN202210404928A CN114590826B CN 114590826 B CN114590826 B CN 114590826B CN 202210404928 A CN202210404928 A CN 202210404928A CN 114590826 B CN114590826 B CN 114590826B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/08—Carbonates; Bicarbonates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
- C01D5/02—Preparation of sulfates from alkali metal salts and sulfuric acid or bisulfates; Preparation of bisulfates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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Abstract
The invention discloses a treatment process and equipment of a potassium-rich mother solution of a lithium hydroxide production system, which relate to the technical field of lithium hydroxide production and have the technical scheme that: the method comprises the following steps: putting the potassium-rich mother solution in the primary mother solution storage tank into a carbonization tank, and introducing carbon dioxide into the carbonization tank; performing solid-liquid separation on the carbonized liquid by a second centrifugal machine; placing carbonized mother liquor in a slurry mixing tank, and adding sulfuric acid and caustic soda flakes into the slurry mixing tank to obtain carbonized and neutralized mother liquor; filtering and carbonizing the neutralization mother solution by a plate-frame filter; evaporating and concentrating the carbonized and neutralized mother solution through an evaporator to obtain glaserite evaporation slurry; performing solid-liquid separation on the glaserite evaporation slurry through a third centrifugal machine; carrying out solid-liquid separation on the glaserite centrifugate again by a first centrifugal machine; the clear liquid is recovered to a carbonization tank. The potassium-rich mother liquor can be completely treated, and the impurity ions in the mother liquor are finally completely treated into solid, so that the production pressure is reduced, and the product quality is improved.
Description
Technical Field
The invention relates to the technical field of lithium hydroxide production, in particular to a treatment process and equipment of a potassium-rich mother solution of a lithium hydroxide production system.
Background
Lithium hydroxide is an inorganic substance, is white monoclinic fine crystal, has pungency, strong alkalinity and corrosiveness, has extremely strong corrosiveness, can burn eyes, skin and upper respiratory tract, can corrode digestive tract by oral administration, can cause death and inhalation, and can cause laryngeal and bronchitis, spasm, chemical pneumonia, pulmonary edema and the like.
At present, recycled mother liquor is generated in the lithium hydroxide production process, impurities such as potassium and sodium in the mother liquor are enriched in the recycling process, the product quality is greatly influenced by the excessive impurity ion content, and the storage of the mother liquor causes great production pressure.
Disclosure of Invention
The invention aims to provide a treatment process and equipment for a potassium-rich mother solution of a lithium hydroxide production system, which can completely treat the potassium-rich mother solution, completely treat impurity ions in the mother solution into solid finally, reduce the production pressure and improve the product quality.
The technical aim of the invention is realized by the following technical scheme: a treatment process of a potassium-rich mother solution of a lithium hydroxide production system is characterized by comprising the following steps: the method comprises the following steps: s1: carbonizing, namely placing the potassium-rich mother solution in the primary mother solution storage tank into a carbonization tank, and introducing carbon dioxide into the carbonization tank to obtain carbonized solution containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonized liquid through a second centrifuge to obtain lithium carbonate and carbonized mother liquid; s3: neutralizing, namely placing carbonized mother liquor in a slurry mixing tank, and adding sulfuric acid and caustic soda flakes into the slurry mixing tank to obtain carbonized neutralized mother liquor; s4: filtering, namely filtering the carbonized and neutralized mother liquor through a plate-and-frame filter to obtain clear liquid and filter residues of the carbonized and neutralized mother liquor; s5: evaporating and concentrating, namely evaporating and concentrating the carbonized and neutralized mother solution by an evaporator to obtain glaserite evaporation slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry through a third centrifuge to obtain glaserite and glaserite centrifugate; s7: performing three times of centrifugation, and performing solid-liquid separation on the glaserite centrifugate through a first centrifuge to obtain clear liquid and glaserite; s8: and (3) recycling, namely recycling the clear liquid to a carbonization tank and repeating the steps S1-S7 for treatment again.
The invention is further provided with: the carbonization neutralization mother liquor is in an alkaline state.
The invention is further provided with: and recycling the filter residues into a slurry mixing tank for neutralization again.
The invention also provides treatment equipment of the potassium-rich mother liquor of the lithium hydroxide production system, which comprises a primary mother liquor storage tank, a carbonization tank, a second centrifugal machine, a pulp mixing tank, a plate-frame filter, an evaporator, a third centrifugal machine, a first centrifugal machine and a first washing water overflow tank, wherein a discharge port of the primary mother liquor storage tank is communicated with a feed port of the carbonization tank; the discharge port of the carbonization tank is communicated with the feed port of the second centrifugal machine; the discharge port of the second centrifugal machine is communicated with the feed port of the slurry mixing tank; the discharge port of the size mixing tank is communicated with the feed port of the plate frame filter; the discharge port of the plate and frame filter is communicated with the feed port of the evaporator; the discharge port of the evaporator is communicated with the feed port of the third centrifugal machine; the discharge port of the third centrifugal machine is communicated with the feed port of the first centrifugal machine; the discharge port of the first centrifugal machine is communicated with the feed port of the first washing water overflow tank; the discharge port of the first washing water overflow groove is communicated with the feed port of the carbonization groove.
The invention is further provided with: the device comprises a carbonization liquid middle-rotating tank, a centrifugal high-level tank, a second washing water overflow tank, a storage tank, a filter pressing middle-rotating tank, a stirring tank and a washing water storage tank flat bottom tank, wherein the carbonization liquid middle-rotating tank and the centrifugal high-level tank are positioned between the carbonization tank and a second centrifugal machine, a feed inlet of the carbonization liquid middle-rotating tank is communicated with a feed outlet of the carbonization tank, a feed outlet of the carbonization liquid middle-rotating tank is communicated with a feed inlet of the centrifugal high-level tank, and a feed outlet of the centrifugal high-level tank is communicated with a feed inlet of the second centrifugal machine; the second washing water overflow groove is positioned between the second centrifugal machine and the pulp mixing groove, the feeding hole of the second washing water overflow groove is communicated with the discharging hole of the second centrifugal machine, and the discharging hole of the second washing water overflow groove is communicated with the feeding hole of the pulp mixing groove; the storage tank and the filter pressing transfer tank are positioned between the pulp mixing tank and the plate frame filter, the feed inlet of the storage tank is communicated with the feed outlet of the pulp mixing tank, the feed outlet of the storage tank is communicated with the feed inlet of the filter pressing transfer tank, and the feed outlet of the filter pressing transfer tank is communicated with the feed inlet of the plate frame filter; the transfer tank is positioned between the plate and frame filter and the evaporator, the feed inlet of the transfer tank is communicated with the discharge outlet of the plate and frame filter, and the discharge outlet of the transfer tank is communicated with the feed inlet of the evaporator; the stirring tank is positioned between the evaporator and the third centrifugal machine, the feed inlet of the stirring tank is communicated with the discharge outlet of the evaporator, and the discharge outlet of the stirring tank is communicated with the feed inlet of the third centrifugal machine; the washing water storage tank flat bottom tank is positioned between the third centrifugal machine and the first centrifugal machine, the feeding port of the washing water storage tank flat bottom tank is communicated with the discharging port of the third centrifugal machine, and the discharging port of the washing water storage tank flat bottom tank is communicated with the feeding port of the first centrifugal machine.
The invention is further provided with: the evaporators are in two groups.
The invention is further provided with: the third centrifugal machine is a double-pushing centrifugal machine.
In summary, the invention has the following beneficial effects: the invention can completely treat the potassium-rich mother liquor, and finally completely treat impurity ions in the mother liquor into solid, thereby reducing the production pressure and improving the product quality.
Drawings
FIG. 1 is a flow chart in an embodiment of the invention;
fig. 2 is a schematic structural view in an embodiment of the present invention.
In the figure: 1. a primary mother liquor storage tank; 2. a carbonization tank; 3. a carbonization liquid transfer tank; 4. centrifuging the elevated tank; 5. a second centrifuge; 6. a second wash water overflow tank; 7. a size mixing tank; 8. a storage tank; 9. a filter pressing transfer groove; 10. a plate frame filter; 11. a transfer tank; 12. an evaporator; 13. a stirring tank; 14. a third centrifuge; 15. a washing tank flat bottom tank; 16. a first centrifuge; 17. a first washing water overflow tank.
Detailed Description
The invention is described in further detail below with reference to fig. 1-2.
Examples: a treatment process of a potassium-rich mother solution of a lithium hydroxide production system, as shown in figure 1, comprises the following steps: s1: carbonizing, namely placing the potassium-rich mother liquor in the primary mother liquor storage tank 1 into a carbonizing tank 2, and introducing carbon dioxide into the carbonizing tank 2 to obtain carbonized liquor containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonized liquid through a second centrifugal machine 5 to obtain lithium carbonate and carbonized mother liquid; s3: neutralizing, namely placing carbonized mother liquor into a size mixing tank 7, and adding sulfuric acid and caustic soda flakes into the size mixing tank 7 to obtain carbonized neutralized mother liquor; s4: filtering, namely filtering the carbonized and neutralized mother liquor through a plate-and-frame filter 10 to obtain clear carbonized and neutralized mother liquor and filter residues; s5: evaporating and concentrating, namely evaporating and concentrating the carbonized and neutralized mother solution through an evaporator 12 to obtain glaserite evaporation slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry through a third centrifugal machine 14 to obtain glaserite and glaserite centrifugate; s7: performing three times of centrifugation, and performing solid-liquid separation on the glaserite centrifugate through a first centrifugal machine 16 to obtain clear liquid and glaserite; s8: and (3) recycling, namely recycling the clear liquid to the carbonization tank 2, and repeating the steps S1-S7 for further treatment.
In the embodiment, the carbon dioxide is introduced into the carbonization tank 2, so that the lithium carbonate is crystallized, and carbonate, sodium ions and potassium ions are left in the carbonized liquid; through one-time centrifugation, lithium carbonate crystals are conveniently separated from carbonized liquid; sodium sulfate and potassium sulfate are obtained by adding sulfuric acid and caustic soda flakes into the size mixing tank 7; the carbonized neutralizing mother liquor is filtered by a plate-and-frame filter 10, so that dregs in the carbonized neutralizing mother liquor are conveniently filtered out; the carbonization neutralization mother liquor is evaporated and concentrated, so that sodium sulfate and potassium sulfate can conveniently form glaserite; the glaserite and the glaserite evaporation slurry are conveniently separated by secondary centrifugation; the residual glaserite in the glaserite centrifugate is separated conveniently through three times of centrifugation; by recycling the clear liquid to the carbonization tank 2, the secondary treatment is facilitated until the impurity ions in the mother liquor are completely treated as solids.
The carbonized and neutralized mother solution is in an alkaline state.
The filter residues are recycled to the size mixing tank 7 for neutralization again.
In the embodiment, the filter residues are recycled to the size mixing tank 7 for neutralization again, so that the sodium ions and potassium ions remained in the filter residues are reacted again, and the waste of materials is avoided.
The invention also provides treatment equipment of the potassium-rich mother liquor of the lithium hydroxide production system, which is shown in fig. 2, and comprises a primary mother liquor storage tank 1, a carbonization tank 2, a second centrifugal machine 5, a slurry mixing tank 7, a plate-frame filter 10, an evaporator 12, a third centrifugal machine 14, a first centrifugal machine 16 and a first washing water overflow tank 17, wherein a discharge port of the primary mother liquor storage tank 1 is communicated with a feed port of the carbonization tank 2; the discharge port of the carbonization tank 2 is communicated with the feed port of the second centrifugal machine 5; the discharge port of the second centrifugal machine 5 is communicated with the feed port of the slurry mixing tank 7; the discharge port of the size mixing tank 7 is communicated with the feed port of the plate-frame filter 10; the discharge port of the plate and frame filter 10 is communicated with the feed port of the evaporator 12; the discharge port of the evaporator 12 is communicated with the feed port of the third centrifugal machine 14; the discharge port of the third centrifuge 14 is communicated with the feed port of the first centrifuge 16; the discharge port of the first centrifugal machine 16 is communicated with the feed port of the first washing water overflow tank 17; the discharge port of the first washing water overflow groove 17 is communicated with the feed port of the carbonization groove 2.
The device also comprises a carbonization liquid transfer tank 3, a centrifugal elevated tank 4, a second washing water overflow tank 6, a storage tank 8, a filter pressing transfer tank 9, a transfer tank 11, a stirring tank 13 and a washing water storage tank flat bottom tank 15, wherein the carbonization liquid transfer tank 3 and the centrifugal elevated tank 4 are positioned between the carbonization tank 2 and the second centrifugal machine 5, a feed inlet of the carbonization liquid transfer tank 3 is communicated with a discharge outlet of the carbonization tank 2, a discharge outlet of the carbonization liquid transfer tank 3 is communicated with a feed inlet of the centrifugal elevated tank 4, and a discharge outlet of the centrifugal elevated tank 4 is communicated with a feed inlet of the second centrifugal machine 5; the second washing water overflow groove 6 is positioned between the second centrifugal machine 5 and the pulp mixing groove 7, a feed inlet of the second washing water overflow groove 6 is communicated with a discharge outlet of the second centrifugal machine 5, and a discharge outlet of the second washing water overflow groove 6 is communicated with a feed inlet of the pulp mixing groove 7; the storage tank 8 and the filter-pressing transfer tank 9 are positioned between the pulp mixing tank 7 and the plate frame filter 10, a feed inlet of the storage tank 8 is communicated with a feed outlet of the pulp mixing tank 7, a feed outlet of the storage tank 8 is communicated with a feed inlet of the filter-pressing transfer tank 9, and a feed outlet of the filter-pressing transfer tank 9 is communicated with a feed inlet of the plate frame filter 10; the transfer tank 11 is positioned between the plate and frame filter 10 and the evaporator 12, a feed inlet of the transfer tank 11 is communicated with a discharge outlet of the plate and frame filter 10, and a discharge outlet of the transfer tank 11 is communicated with a feed inlet of the evaporator 12; the stirring tank 13 is positioned between the evaporator 12 and the third centrifugal machine 14, a feed inlet of the stirring tank 13 is communicated with a discharge outlet of the evaporator 12, and a discharge outlet of the stirring tank 13 is communicated with a feed inlet of the third centrifugal machine 14; the wash tank flat bottom tank 15 is positioned between the third centrifuge 14 and the first centrifuge 16, and the feed port of the wash tank flat bottom tank 15 is communicated with the discharge port of the third centrifuge 14, and the discharge port of the wash tank flat bottom tank 15 is communicated with the feed port of the first centrifuge 16.
In the embodiment, the primary mother liquor storage tank 1 is used for conveniently storing the potassium-rich mother liquor; the carbon dioxide is conveniently introduced into the carbonization tank 2 to carbonize the potassium-rich mother liquor; the liquid is conveniently supplied to the second centrifugal machine 5 through the centrifugal elevated tank; the second centrifugal machine 5 is used for facilitating solid-liquid separation of the carbonized liquid to obtain lithium carbonate and carbonized mother liquid; the carbonization mother liquor is convenient to store through the second washing water overflow groove 6; the slurry mixing tank 7 is used for conveniently carrying out neutralization slurry mixing on the carbonized mother liquor to obtain carbonized neutralized mother liquor; the storage tank 8 is used for conveniently storing carbonization and neutralization mother liquor; the mother liquor is conveniently carbonized and neutralized before filtration through a filter pressing transfer tank 9; the plate-frame filter is convenient for filtering the carbonization neutralization mother liquor, so as to obtain clear liquid and filter residues of the carbonization neutralization mother liquor; the mother liquor clear liquid is conveniently carbonized and neutralized before evaporation and concentration through the transfer tank 11; the evaporator 12 is used for conveniently evaporating and concentrating the carbonized and neutralized mother liquor clear liquid, so as to obtain glaserite evaporation slurry; temporarily storing the glaserite evaporation slurry through a stirring and washing tank 13; separating out the glaserite in the glaserite evaporation slurry by a third centrifugal machine 14 to obtain glaserite and glaserite centrifugate; storing glaserite centrifugate through a washing water storage tank flat bottom tank 15; the first centrifugal machine 16 is used for conveniently carrying out solid-liquid separation on the glaserite centrifugate again to obtain glaserite and clear liquid; the clear liquid is stored through the first wash water overflow tank 17.
The evaporators 12 are in two groups.
The third centrifuge 14 is a double-push centrifuge.
Working principle: carbon dioxide is introduced into the carbonization tank 2, so that lithium carbonate is convenient to crystallize, and carbonate radicals, sodium ions and potassium ions are left in the carbonized liquid; through one-time centrifugation, lithium carbonate crystals are conveniently separated from carbonized liquid; sodium sulfate and potassium sulfate are obtained by adding sulfuric acid and caustic soda flakes into the size mixing tank 7; the carbonized neutralizing mother liquor is filtered by a plate-and-frame filter 10, so that dregs in the carbonized neutralizing mother liquor are conveniently filtered out; the carbonization neutralization mother liquor is evaporated and concentrated, so that sodium sulfate and potassium sulfate can conveniently form glaserite; the glaserite and the glaserite evaporation slurry are conveniently separated by secondary centrifugation; the residual glaserite in the glaserite centrifugate is separated conveniently through three times of centrifugation; by recycling the clear liquid to the carbonization tank 2, the secondary treatment is facilitated until the impurity ions in the mother liquor are completely treated as solids.
The present embodiment is only for explanation of the present invention and is not to be construed as limiting the present invention, and modifications to the present embodiment, which may not creatively contribute to the present invention as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present invention.
Claims (7)
1. A treatment process of a potassium-rich mother solution of a lithium hydroxide production system is characterized by comprising the following steps: the method comprises the following steps: s1: carbonizing, namely placing the potassium-rich mother solution in the primary mother solution storage tank (1) into a carbonizing tank (2), and introducing carbon dioxide into the carbonizing tank (2) to obtain carbonized solution containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonized liquid through a second centrifugal machine (5) to obtain lithium carbonate and carbonized mother liquid; s3: neutralizing, namely placing carbonized mother liquor into a slurry mixing tank (7), and adding sulfuric acid and caustic soda flakes into the slurry mixing tank (7) to obtain carbonized neutralized mother liquor; s4: filtering, namely filtering the carbonized and neutralized mother liquor through a plate-and-frame filter (10) to obtain clear carbonized and neutralized mother liquor and filter residues; s5: evaporating and concentrating, namely evaporating and concentrating the carbonized and neutralized mother solution through an evaporator (12) to obtain glaserite evaporating slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry through a third centrifugal machine (14) to obtain glaserite and glaserite centrifugate; s7: performing three times of centrifugation, and performing solid-liquid separation on the glaserite centrifugate through a first centrifugal machine (16) to obtain clear liquid and glaserite; s8: and (3) recycling, namely recycling the clear liquid to the carbonization tank (2), and repeating the steps S1-S7 for further treatment.
2. The process for treating the potassium-rich mother liquor of the lithium hydroxide production system according to claim 1, which is characterized in that: the carbonization neutralization mother liquor is in an alkaline state.
3. The process for treating the potassium-rich mother liquor of the lithium hydroxide production system according to claim 1, which is characterized in that: and recycling the filter residues into a size mixing tank (7) for neutralization again.
4. A processing equipment of lithium hydroxide production system rich in potassium mother liquor, characterized by: the device comprises a primary mother liquor storage tank (1), a carbonization tank (2), a second centrifugal machine (5), a slurry mixing tank (7), a plate-frame filter (10), an evaporator (12), a third centrifugal machine (14), a first centrifugal machine (16) and a first washing water overflow tank (17), wherein a discharge port of the primary mother liquor storage tank (1) is communicated with a feed port of the carbonization tank (2); the discharge port of the carbonization tank (2) is communicated with the feed port of the second centrifugal machine (5); the discharge port of the second centrifugal machine (5) is communicated with the feed port of the slurry mixing tank (7); the discharge port of the size mixing tank (7) is communicated with the feed port of the plate-frame filter (10); the discharge port of the plate and frame filter (10) is communicated with the feed port of the evaporator (12); the discharge port of the evaporator (12) is communicated with the feed port of the third centrifugal machine (14); the discharge port of the third centrifugal machine (14) is communicated with the feed port of the first centrifugal machine (16); the discharge port of the first centrifugal machine (16) is communicated with the feed port of the first washing water overflow tank (17); the discharge port of the first washing water overflow groove (17) is communicated with the feed port of the carbonization groove (2).
5. The treatment equipment for the potassium-rich mother liquor of the lithium hydroxide production system according to claim 4, wherein the treatment equipment comprises the following steps: the device comprises a carbonization liquid transfer tank (3), a centrifugal high-level tank (4), a second washing water overflow tank (6), a storage tank (8), a filter pressing transfer tank (9), a transfer tank (11), a stirring tank (13) and a washing water storage tank flat bottom tank (15), wherein the carbonization liquid transfer tank (3) and the centrifugal high-level tank (4) are positioned between the carbonization tank (2) and a second centrifugal machine (5), a feed inlet of the carbonization liquid transfer tank (3) is communicated with a discharge outlet of the carbonization tank (2), a discharge outlet of the carbonization liquid transfer tank (3) is communicated with a feed inlet of the centrifugal high-level tank (4), and a discharge outlet of the centrifugal high-level tank (4) is communicated with a feed inlet of the second centrifugal machine (5); the second washing water overflow groove (6) is positioned between the second centrifugal machine (5) and the pulp mixing groove (7), a feed port of the second washing water overflow groove (6) is communicated with a discharge port of the second centrifugal machine (5), and a discharge port of the second washing water overflow groove (6) is communicated with a feed port of the pulp mixing groove (7); the storage tank (8) and the filter pressing transfer groove (9) are positioned between the pulp mixing groove (7) and the plate frame filter (10), a feed inlet of the storage tank (8) is communicated with a feed outlet of the pulp mixing groove (7), a feed outlet of the storage tank (8) is communicated with a feed inlet of the filter pressing transfer groove (9), and a feed outlet of the filter pressing transfer groove (9) is communicated with a feed inlet of the plate frame filter (10); the transfer tank (11) is positioned between the plate-and-frame filter (10) and the evaporator (12), a feed inlet of the transfer tank (11) is communicated with a discharge outlet of the plate-and-frame filter (10), and a discharge outlet of the transfer tank (11) is communicated with a feed inlet of the evaporator (12); the stirring and washing tank (13) is positioned between the evaporator (12) and the third centrifugal machine (14), a feed inlet of the stirring and washing tank (13) is communicated with a discharge outlet of the evaporator (12), and a discharge outlet of the stirring and washing tank (13) is communicated with a feed inlet of the third centrifugal machine (14); the washing water storage tank flat bottom tank (15) is positioned between the third centrifugal machine (14) and the first centrifugal machine (16), a feed inlet of the washing water storage tank flat bottom tank (15) is communicated with a discharge outlet of the third centrifugal machine (14), and a discharge outlet of the washing water storage tank flat bottom tank (15) is communicated with a feed inlet of the first centrifugal machine (16).
6. The process and equipment for treating a potassium-rich mother liquor of a lithium hydroxide production system according to claim 4, wherein the process and equipment are characterized in that: the evaporators (12) are two groups.
7. The process and equipment for treating a potassium-rich mother liquor of a lithium hydroxide production system according to claim 4, wherein the process and equipment are characterized in that: the third centrifuge (14) is a double-push centrifuge.
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