CN114590826A - 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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- CN114590826A CN114590826A CN202210404928.0A CN202210404928A CN114590826A CN 114590826 A CN114590826 A CN 114590826A CN 202210404928 A CN202210404928 A CN 202210404928A CN 114590826 A CN114590826 A CN 114590826A
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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
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- 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 processing technology and equipment of potassium-rich mother liquor of a lithium hydroxide production system, relating to the technical field of lithium hydroxide production, and the key points of the technical scheme are as follows: the method comprises the following steps: putting the potassium-rich mother liquor in the primary mother liquor storage tank into a carbonization tank, and introducing carbon dioxide into the carbonization tank; carrying out solid-liquid separation on the carbonized liquid through a second centrifugal machine; putting the carbonization mother liquor into a size mixing tank, and adding sulfuric acid and caustic soda flakes into the size mixing tank to obtain carbonization neutralization mother liquor; filtering the carbonization neutralization mother liquor by a plate and frame filter; evaporating and concentrating the carbonized and neutralized mother liquor by an evaporator to obtain glaserite evaporation slurry; carrying out solid-liquid separation on the glaserite evaporation slurry by a third centrifugal machine; carrying out solid-liquid separation on the glaserite centrifugate again by using a first centrifugal machine; and recovering the clear liquid to a carbonization tank. The potassium-rich mother liquor can be completely treated, so that impurity ions in the mother liquor are finally and completely treated into solid, 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 for potassium-rich mother liquor of a lithium hydroxide production system.
Background
Lithium hydroxide is an inorganic substance, is white monoclinic fine crystal, has pungent taste, strong basicity and corrosivity, is extremely corrosive, can burn eyes, skin and upper respiratory tract, can corrode digestive tract by oral administration, can cause death and inhalation, and can cause throat and bronchitis diseases, spasm, chemical pneumonia, pulmonary edema and the like.
At present, the mother liquor which is recycled is generated in the production process of lithium hydroxide, the ion content of impurities such as potassium and sodium in the mother liquor is enriched in the recycling process, the product quality is greatly influenced by the high content of the impurity ions, 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 potassium-rich mother liquor of a lithium hydroxide production system, which can completely treat the potassium-rich mother liquor, finally and completely treat impurity ions in the mother liquor into solid, reduce production pressure and improve product quality.
The technical purpose of the invention is realized by the following technical scheme: a treatment process of potassium-rich mother liquor of a lithium hydroxide production system is characterized by comprising the following steps: the method comprises the following steps: s1: carbonizing, namely putting the potassium-rich mother liquor in the primary mother liquor storage tank into a carbonization tank, and introducing carbon dioxide into the carbonization tank to obtain carbonized liquid containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonization liquid through a second centrifugal machine to obtain lithium carbonate and carbonization mother liquor; s3: neutralizing, namely placing the carbonization mother liquor in a size mixing tank, and adding sulfuric acid and caustic soda flakes into the size mixing tank to obtain carbonization neutralization mother liquor; s4: filtering, namely filtering the carbonized neutralization mother liquor by using a plate and frame filter to obtain a carbonized neutralization mother liquor clear solution and filter residues; s5: evaporating and concentrating, namely evaporating and concentrating the carbonized and neutralized mother liquor through an evaporator to obtain glaserite evaporation slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry by using a third centrifuge to obtain glaserite and glaserite centrifugate; s7: centrifuging for the third time, and performing solid-liquid separation on the glaserite centrifugate again by using a first centrifuge to obtain clear liquid and glaserite; s8: and (4) recovering, recovering the clear liquid to a carbonization tank, and repeating the steps from S1 to S7 for processing again.
The invention is further configured to: the carbonization neutralization mother liquor is in an alkaline state.
The invention is further configured to: and recycling the filter residue to a size mixing tank for neutralization again.
The invention also provides a treatment device for 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 size 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 hole of the primary mother liquor storage tank is communicated with a feed inlet of the carbonization tank; the discharge hole of the carbonization tank is communicated with the feed inlet of a second centrifugal machine; the discharge hole of the second centrifugal machine is communicated with the feed inlet of the size mixing tank; the discharge hole of the size mixing tank is communicated with the feed inlet of the plate frame filter; the discharge hole of the plate frame filter is communicated with the feed inlet of the evaporator; the discharge hole of the evaporator is communicated with the feed inlet of a third centrifugal machine; the discharge hole of the third centrifuge is communicated with the feed inlet of the first centrifuge; the discharge hole of the first centrifuge is communicated with the feed inlet of the first washing water overflow trough; and the discharge hole of the first washing water overflow groove is communicated with the feed inlet of the carbonization groove.
The invention is further configured to: the device also comprises a carbonization liquid transfer tank, a centrifugal elevated tank, a second washing water overflow tank, a storage tank, a filter pressing transfer tank, a transfer tank, an agitation tank and a washing water storage tank flat-bottom tank, wherein the carbonization liquid transfer tank and the centrifugal elevated tank are positioned between the carbonization tank and a second centrifuge, a feed inlet of the carbonization liquid transfer tank is communicated with a discharge outlet of the carbonization tank, a discharge outlet of the carbonization liquid transfer tank is communicated with a feed inlet of the centrifugal elevated tank, and a discharge outlet of the centrifugal elevated tank is communicated with a feed inlet of the second centrifuge; the second washing water overflow groove is positioned between the second centrifugal machine and the size mixing groove, the feed inlet of the second washing water overflow groove is communicated with the discharge outlet of the second centrifugal machine, and the discharge outlet of the second washing water overflow groove is communicated with the feed inlet of the size mixing groove; the storage tank and the filter-pressing transfer tank are positioned between the size mixing tank and the plate-and-frame filter, a feed inlet of the storage tank is communicated with a discharge outlet of the size mixing tank, a discharge outlet of the storage tank is communicated with a feed inlet of the filter-pressing transfer tank, and a discharge outlet of the filter-pressing transfer tank is communicated with a feed inlet of the plate-and-frame filter; the transfer tank is positioned between the plate frame filter and the evaporator, a feed port of the transfer tank is communicated with a discharge port of the plate frame filter, and the discharge port of the transfer tank is communicated with a feed port of the evaporator; the agitation and washing tank is positioned between the evaporator and the third centrifugal machine, a feed port of the agitation and washing tank is communicated with a discharge port of the evaporator, and a discharge port of the agitation and washing tank is communicated with a feed port of the third centrifugal machine; wash water storage tank flat-bottom jar is located between third centrifuge and the first centrifuge, just the feed inlet of wash water storage tank flat-bottom jar and the discharge gate intercommunication of third centrifuge, the discharge gate of wash water storage tank flat-bottom jar and the feed inlet intercommunication of first centrifuge.
The invention is further configured to: the evaporators are divided into two groups.
The invention is further configured to: the third centrifuge is a double-push centrifuge.
In conclusion, the invention has the following beneficial effects: the invention can completely treat the potassium-rich mother liquor, finally completely treat impurity ions in the mother liquor into solid, reduce the production pressure and improve the product quality.
Drawings
FIG. 1 is a flow chart in an embodiment of the invention;
fig. 2 is a schematic structural diagram in the 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. a centrifugal elevated tank; 5. a second centrifuge; 6. a second wash water overflow trough; 7. a size mixing tank; 8. a storage tank; 9. filter pressing transfer tank; 10. a plate frame filter; 11. a transit trough; 12. an evaporator; 13. a stirring and washing tank; 14. a third centrifuge; 15. a washing water storage tank flat bottom tank; 16. a first centrifuge; 17. a first wash water overflow launder.
Detailed Description
The present invention is described in further detail below with reference to FIGS. 1-2.
Example (b): a treatment process of potassium-rich mother liquor in a lithium hydroxide production system is shown in figure 1, and comprises the following steps: s1: carbonizing, namely putting the potassium-rich mother liquor in the primary mother liquor storage tank 1 into a carbonization tank 2, and introducing carbon dioxide into the carbonization tank 2 to obtain carbonized liquid containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonization liquid through a second centrifuge 5 to obtain lithium carbonate and carbonization mother liquid; s3: neutralizing, namely placing the carbonization mother liquor in a size mixing tank 7, and adding sulfuric acid and caustic soda flakes into the size mixing tank 7 to obtain carbonization neutralization mother liquor; s4: filtering, namely filtering the carbonized neutralization mother liquor by using a plate and frame filter 10 to obtain a carbonized neutralization mother liquor clear liquid and filter residues; s5: evaporation concentration, namely evaporating and concentrating the carbonized neutralization mother liquor through an evaporator 12 to obtain glaserite evaporation slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry by using a third centrifuge 14 to obtain glaserite and glaserite centrifugate; s7: centrifuging for the third time, and performing solid-liquid separation on the glaserite centrifugate again by using a first centrifuge 16 to obtain clear liquid and glaserite; s8: and (4) recovering, recovering the clear liquid to the carbonization tank 2, and repeating the steps from S1 to S7 for processing again.
In the embodiment, carbon dioxide is introduced into the carbonization tank 2, so that lithium carbonate is crystallized, and carbonate, sodium ions and potassium ions are left in the carbonization liquid; the lithium carbonate crystal is conveniently separated from the carbonization liquid through primary centrifugation; adding sulfuric acid and flake caustic soda into a size mixing tank 7 to obtain sodium sulfate and potassium sulfate; filtering the carbonization neutralization mother liquor through a plate and frame filter 10, so that dregs in the carbonization neutralization mother liquor can be conveniently filtered out; evaporating and concentrating the carbonization neutralization mother liquor, so that sodium sulfate and potassium sulfate can form glaserite conveniently; by secondary centrifugation, the glaserite and the glaserite evaporation slurry are conveniently separated; centrifuging for three times to separate out the residual glaserite in the glaserite centrifugating liquid; the clear liquid is recovered to the carbonization tank 2, so that the secondary treatment is convenient until the impurity ions in the mother liquid are completely treated into solid.
The carbonization neutralization mother liquor is in an alkaline state.
The filter residue is recycled to the size mixing tank 7 for neutralization again.
In this implementation, through retrieve the filter residue and carry out neutralization once more in size mixing groove 7, be convenient for make remaining sodium ion and potassium ion in the filter residue react once more, avoid causing the material extravagant.
The invention also provides a potassium-rich mother liquor treatment device of a lithium hydroxide production system, which comprises a primary mother liquor storage tank 1, a carbonization tank 2, a second centrifuge 5, a size mixing tank 7, a plate-frame filter 10, an evaporator 12, a third centrifuge 14, a first centrifuge 16 and a first washing water overflow tank 17, wherein a discharge hole of the primary mother liquor storage tank 1 is communicated with a feed inlet of the carbonization tank 2; the discharge hole of the carbonization tank 2 is communicated with the feed inlet of a second centrifugal machine 5; the discharge hole of the second centrifugal machine 5 is communicated with the feed inlet of the size mixing tank 7; the discharge hole of the size mixing tank 7 is communicated with the feed inlet of the plate frame filter 10; the discharge hole of the plate frame filter 10 is communicated with the feed inlet of the evaporator 12; the discharge hole of the evaporator 12 is communicated with the feed hole of the third centrifuge 14; the discharge port of the third centrifuge 14 is communicated with the feed port of the first centrifuge 16; the discharge hole of the first centrifuge 16 is communicated with the feed hole of the first washing water overflow trough 17; the discharge hole of the first washing water overflow groove 17 is communicated with the feed hole 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 washing 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 centrifuge 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 centrifuge 5; the second washing water overflow groove 6 is positioned between the second centrifuge 5 and the size mixing groove 7, the feed inlet of the second washing water overflow groove 6 is communicated with the discharge outlet of the second centrifuge 5, and the discharge outlet of the second washing water overflow groove 6 is communicated with the feed inlet of the size mixing groove 7; the storage tank 8 and the filter-pressing transfer tank 9 are positioned between the size mixing tank 7 and the plate-and-frame filter 10, the feed inlet of the storage tank 8 is communicated with the discharge outlet of the size mixing tank 7, the discharge outlet of the storage tank 8 is communicated with the feed inlet of the filter-pressing transfer tank 9, and the discharge outlet of the filter-pressing transfer tank 9 is communicated with the feed inlet of the plate-and-frame filter 10; the transfer tank 11 is positioned between the plate frame filter 10 and the evaporator 12, a feed port of the transfer tank 11 is communicated with a discharge port of the plate frame filter 10, and a discharge port of the transfer tank 11 is communicated with a feed port of the evaporator 12; the agitation and washing tank 13 is positioned between the evaporator 12 and the third centrifuge 14, a feed inlet of the agitation and washing tank 13 is communicated with a discharge outlet of the evaporator 12, and a discharge outlet of the agitation and washing tank 13 is communicated with a feed inlet of the third centrifuge 14; the washing water storage tank flat-bottom tank 15 is located between the third centrifuge 14 and the first centrifuge 16, a feed port of the washing water storage tank flat-bottom tank 15 is communicated with a discharge port of the third centrifuge 14, and a discharge port of the washing water storage tank flat-bottom tank 15 is communicated with a feed port of the first centrifuge 16.
In the embodiment, the potassium-rich mother liquor is conveniently stored through the primary mother liquor storage tank 1; carbon dioxide is conveniently introduced to carbonize the potassium-rich mother liquor through the carbonization tank 2; liquid is conveniently supplied to the second centrifuge 5 through the centrifugal elevated tank; the carbonization liquid is convenient to carry out solid-liquid separation through a second centrifugal machine 5, so that lithium carbonate and carbonization mother liquor are obtained; the carbonization mother liquor is convenient to store through the second washing water overflow trough 6; the carbonized mother liquor is conveniently neutralized and size-mixed through the size mixing tank 7 to obtain carbonized neutralized mother liquor; the carbonization neutralization mother liquor is convenient to store through the storage tank 8; the filter pressing transfer tank 9 is used for transferring the carbonized neutralization mother liquor before filtration; the carbonized neutralization mother liquor is conveniently filtered through a plate and frame filter, so that the carbonized neutralization mother liquor clear liquid and filter residue are obtained; the neutralization mother liquor is convenient to transit and carbonize before evaporation concentration through a transit tank 11; the carbonized neutralized mother liquor clear liquid is convenient to evaporate and concentrate through an evaporator 12, so as to obtain glaserite evaporation slurry; temporarily storing the glaserite evaporation slurry through the agitation washing tank 13; separating the glaserite in the glaserite evaporation slurry by a third centrifuge 14 to obtain glaserite and a glaserite centrifugate; storing the glaserite centrifugate by a washing water storage tank flat-bottom tank 15; the glaserite centrifugate is convenient to carry out solid-liquid separation again through the first centrifugal machine 16, and glaserite and clear liquid are obtained; the clear liquid is stored through the first washing water overflow tank 17.
There are two sets of evaporators 12.
The third centrifuge 14 is a double-push centrifuge.
The working principle is as follows: carbon dioxide is introduced into the carbonization tank 2, so that lithium carbonate is crystallized conveniently, and carbonate, sodium ions and potassium ions are left in the carbonization liquid; the lithium carbonate crystal is conveniently separated from the carbonization liquid through primary centrifugation; adding sulfuric acid and flake caustic soda into a size mixing tank 7 to obtain sodium sulfate and potassium sulfate; filtering the carbonization neutralization mother liquor through a plate and frame filter 10, so that dregs in the carbonization neutralization mother liquor can be conveniently filtered out; evaporating and concentrating the carbonization neutralization mother liquor, so that sodium sulfate and potassium sulfate can form glaserite conveniently; through the secondary centrifugation, the glaserite and the glaserite evaporation slurry are conveniently separated; centrifuging for three times to separate out the residual glaserite in the glaserite centrifugating liquid; the clear liquid is recovered to the carbonization tank 2, so that the secondary treatment is convenient until the impurity ions in the mother liquid are completely treated into solid.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. A treatment process of potassium-rich mother liquor of a lithium hydroxide production system is characterized by comprising the following steps: the method comprises the following steps: s1: carbonizing, namely putting the potassium-rich mother liquor in the primary mother liquor storage tank (1) into a carbonization tank (2), and introducing carbon dioxide into the carbonization tank (2) to obtain carbonization liquor containing lithium carbonate crystals; s2: performing primary centrifugation, and performing solid-liquid separation on the carbonization liquid through a second centrifugal machine (5) to obtain lithium carbonate and carbonization mother liquid; s3: neutralizing, namely placing the carbonization mother liquor in a size mixing tank (7), and adding sulfuric acid and caustic soda flakes into the size mixing tank (7) to obtain carbonization neutralization mother liquor; s4: filtering, namely filtering the carbonized neutralization mother liquor by a plate and frame filter (10) to obtain a carbonized neutralization mother liquor clear solution and filter residues; s5: evaporation concentration, namely evaporating and concentrating the carbonization neutralization mother liquor through an evaporator (12) to obtain glaserite evaporation slurry; s6: performing secondary centrifugation, and performing solid-liquid separation on the glaserite evaporation slurry by using a third centrifuge (14) to obtain glaserite and glaserite centrifugate; s7: centrifuging for three times, and performing solid-liquid separation on the glaserite centrifugate again by using a first centrifuge (16) to obtain clear liquid and glaserite; s8: and (4) recovering, namely recovering the clear liquid to the carbonization tank (2) and repeating the steps from S1 to S7 for processing again.
2. The process for treating the potassium-rich mother liquor in the lithium hydroxide production system according to claim 1, which is characterized by comprising the following steps: the carbonization neutralization mother liquor is in an alkaline state.
3. The process for treating the potassium-rich mother liquor in the lithium hydroxide production system according to claim 1, which is characterized by comprising the following steps: and recycling the filter residue to a size mixing tank (7) for neutralization again.
4. A treatment device for potassium-rich mother liquor in a lithium hydroxide production system is characterized in that: the device comprises a primary mother liquor storage tank (1), a carbonization tank (2), a second centrifugal machine (5), a size 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 hole of the primary mother liquor storage tank (1) is communicated with a feed hole of the carbonization tank (2); the discharge hole of the carbonization tank (2) is communicated with the feed inlet of a second centrifugal machine (5); the discharge hole of the second centrifugal machine (5) is communicated with the feed inlet of the size mixing groove (7); the discharge hole of the size mixing tank (7) is communicated with the feed inlet of the plate frame filter (10); the discharge hole of the plate and frame filter (10) is communicated with the feed inlet of the evaporator (12); the discharge hole of the evaporator (12) is communicated with the feed inlet of a third centrifugal machine (14); the discharge hole of the third centrifugal machine (14) is communicated with the feed hole of the first centrifugal machine (16); the discharge hole of the first centrifuge (16) is communicated with the feed hole of the first washing overflow trough (17); the discharge hole of the first washing water overflow groove (17) is communicated with the feed inlet of the carbonization groove (2).
5. The equipment for treating the potassium-rich mother liquor in the lithium hydroxide production system according to claim 4, which is characterized in that: the device is characterized by further comprising 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 port of the carbonization liquid transfer tank (3) is communicated with a discharge port of the carbonization tank (2), a discharge port of the carbonization liquid transfer tank (3) is communicated with a feed port of the centrifugal elevated tank (4), and a discharge port of the centrifugal elevated tank (4) is communicated with a feed port of the second centrifugal machine (5); the second washing water overflow groove (6) is positioned between the second centrifugal machine (5) and the size mixing groove (7), the feed inlet of the second washing water overflow groove (6) is communicated with the discharge outlet of the second centrifugal machine (5), and the discharge outlet of the second washing water overflow groove (6) is communicated with the feed inlet of the size mixing groove (7); the storage tank (8) and the filter-pressing transfer tank (9) are positioned between the size mixing tank (7) and the plate-and-frame filter (10), a feed inlet of the storage tank (8) is communicated with a discharge outlet of the size mixing tank (7), a discharge outlet of the storage tank (8) is communicated with a feed inlet of the filter-pressing transfer tank (9), and a discharge outlet of the filter-pressing transfer tank (9) is communicated with a feed inlet of the plate-and-frame filter (10); the transfer tank (11) is positioned between the plate frame filter (10) and the evaporator (12), the feed inlet of the transfer tank (11) is communicated with the discharge outlet of the plate frame filter (10), and the discharge outlet of the transfer tank (11) is communicated with the feed inlet of the evaporator (12); the agitation and washing tank (13) is positioned between the evaporator (12) and the third centrifugal machine (14), the feed inlet of the agitation and washing tank (13) is communicated with the discharge outlet of the evaporator (12), and the discharge outlet of the agitation and washing tank (13) is communicated with the feed inlet of the third centrifugal machine (14); wash water storage tank flat-bottom jar (15) and be located between third centrifuge (14) and first centrifuge (16), just the feed inlet of wash water storage tank flat-bottom jar (15) and the discharge gate intercommunication of third centrifuge (14), the discharge gate of wash water storage tank flat-bottom jar (15) and the feed inlet intercommunication of first centrifuge (16).
6. The treatment process and the equipment for the potassium-rich mother liquor in the lithium hydroxide production system according to claim 4 are characterized in that: the evaporators (12) are divided into two groups.
7. The process and the equipment for treating the potassium-rich mother liquor in the lithium hydroxide production system according to claim 4 are characterized in that: the third centrifuge (14) is a double-push centrifuge.
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