CN112479234A - Process for producing lithium hydroxide monohydrate from salt lake ore - Google Patents
Process for producing lithium hydroxide monohydrate from salt lake ore Download PDFInfo
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- CN112479234A CN112479234A CN202011543669.7A CN202011543669A CN112479234A CN 112479234 A CN112479234 A CN 112479234A CN 202011543669 A CN202011543669 A CN 202011543669A CN 112479234 A CN112479234 A CN 112479234A
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- lithium hydroxide
- salt lake
- hydroxide monohydrate
- causticized
- liquid
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000008569 process Effects 0.000 title claims abstract description 27
- PQVSTLUFSYVLTO-UHFFFAOYSA-N ethyl n-ethoxycarbonylcarbamate Chemical compound CCOC(=O)NC(=O)OCC PQVSTLUFSYVLTO-UHFFFAOYSA-N 0.000 title claims abstract description 26
- GLXDVVHUTZTUQK-UHFFFAOYSA-M lithium hydroxide monohydrate Substances [Li+].O.[OH-] GLXDVVHUTZTUQK-UHFFFAOYSA-M 0.000 title claims abstract description 26
- 229940040692 lithium hydroxide monohydrate Drugs 0.000 title claims abstract description 26
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 238000007710 freezing Methods 0.000 claims abstract description 12
- 230000008014 freezing Effects 0.000 claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 8
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 6
- 238000009993 causticizing Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 29
- 238000001914 filtration Methods 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 15
- 239000012452 mother liquor Substances 0.000 claims description 15
- 239000000047 product Substances 0.000 claims description 15
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000292 calcium oxide Substances 0.000 claims description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 239000000243 solution Substances 0.000 claims description 13
- 230000008020 evaporation Effects 0.000 claims description 11
- 239000012065 filter cake Substances 0.000 claims description 11
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910001424 calcium ion Inorganic materials 0.000 claims description 10
- 238000000746 purification Methods 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 6
- RSIJVJUOQBWMIM-UHFFFAOYSA-L sodium sulfate decahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].[O-]S([O-])(=O)=O RSIJVJUOQBWMIM-UHFFFAOYSA-L 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 3
- 239000012670 alkaline solution Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 230000003139 buffering effect Effects 0.000 claims description 3
- 239000011575 calcium Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 claims description 3
- 238000002844 melting Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000008237 rinsing water Substances 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 239000008399 tap water Substances 0.000 claims description 3
- 235000020679 tap water Nutrition 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- 239000012043 crude product Substances 0.000 claims description 2
- 238000007664 blowing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052642 spodumene Inorganic materials 0.000 abstract description 9
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Chemical compound [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052744 lithium Inorganic materials 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 abstract description 3
- 235000011152 sodium sulphate Nutrition 0.000 abstract description 3
- 238000001035 drying Methods 0.000 abstract description 2
- 238000004537 pulping Methods 0.000 abstract 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000003860 storage Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 238000001354 calcination Methods 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000012629 purifying agent Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- 239000003513 alkali Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003837 high-temperature calcination Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D15/00—Lithium compounds
- C01D15/02—Oxides; Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to the technical field of lithium hydroxide production, in particular to a process for producing lithium hydroxide monohydrate by using salt lake ores, which comprises the following steps: mixing salt lake ore with water, pulping, purifying, causticizing, removing sodium sulfate by freezing, evaporating, concentrating, drying and the like to finally obtain the lithium hydroxide. The invention has the advantages that: the process for producing lithium hydroxide monohydrate by using salt lake ore takes salt lake ore as raw material, wherein the salt lake ore Li2SO4·H2The content of O reaches 80.1-92.1%, the average content is 85.1%, the process uses salt lake ores to produce the lithium hydroxide monohydrate, the dilemma of insufficient lithium ore resources is solved, the risk of insufficient resources resistance of a production line is increased, and the equipment cost is saved; spodumene is not used in the process, so that the consumption of spodumene is reduced, the process is simplified, and the energy consumption and the production equipment investment are reduced.
Description
Technical Field
The invention relates to the technical field of lithium hydroxide production, in particular to a process for producing lithium hydroxide monohydrate by using salt lake ores.
Background
The lithium hydroxide is widely applied to industries such as chemical raw materials, metallurgy, battery industry, ceramics, national defense, atomic energy, aerospace and the like, is used as an alkaline storage battery additive in the battery industry, can prolong the service life of the alkaline storage battery additive and increase the storage capacity of the alkaline storage battery additive. The main method for producing lithium hydroxide monohydrate at present is to use spodumene as a raw material and obtain the lithium hydroxide monohydrate through the process steps of high-temperature calcination transformation, cooling, ball milling, acidification roasting, cooling, size mixing, leaching, squeezing separation, sodium sulfate freezing separation, evaporation, low-temperature recrystallization and the like.
However, spodumene is insufficient in resources, and a new mineral source needs to be searched to meet the production requirement. Salt lake ore Li2SO4·H2The content of O is 80.1-92.1%, the average content is 85.1%, in the prior art, lithium products produced by salt lake ores are only industrial grade generally, and the economic restriction factors for producing battery grade products from the path are more.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a process for producing lithium hydroxide monohydrate by using salt lake ores, and the process for producing the lithium hydroxide monohydrate by using the salt lake ores uses the salt lake ores as raw materials, wherein the salt lake ores L are subjected to chemical reactioni2SO4·H2The content of O reaches 80.1-92.1%, the average content is 85.1%, the process is used for producing the lithium hydroxide monohydrate by using the salt lake ore, the dilemma of insufficient lithium ore resources is solved, the risk of insufficient resistance resources of a production line is increased, and the equipment cost is saved.
The purpose of the invention is realized by the following technical scheme:
a process for producing lithium hydroxide monohydrate from salt lake ore comprises the following steps:
s1, mixing water with salt lake ore, wherein Li2The concentration of O is 30-45 g/L, the mixed and size-mixed liquid is purified by lithium hydroxide mother liquor or calcium oxide, the pH value is adjusted to 9-12, and impurities of iron, manganese, aluminum and calcium in the filtered clear liquid are removed; then filtering by using a filter press to obtain filtered clear liquid;
s2, filtering the clear filtrate obtained in the step S1 again to obtain purified liquid and purified filter residues, causticizing the purified liquid by using 50% alkaline solution or crude product mother liquor, wherein the pH value of the causticized solution is 11-14, and the temperature is normal temperature;
s3, filtering the causticized solution obtained in the step S2 to obtain causticized liquid and causticized filter residue, wherein lithium hydroxide Li in the causticized liquid2Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;
s4, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;
s5, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating to 200-800 ℃, filtering a lithium hydroxide solution through a precision filter to remove a part of calcium ions, then performing evaporation concentration, crystallizing, centrifuging, re-melting, filtering through the precision filter, performing evaporation concentration after filtering, cooling, crystallizing and separating to obtain lithium hydroxide crystals, heating through a disc dryer to obtain lithium hydroxide monohydrate, and heating to 50-150 ℃;
s6, conveying the lithium hydroxide monohydrate obtained by heating the disc dryer to a vibrating screen through an air conveying device for particle screening, conveying the screened material to a vacuum feeding system for buffering, intermittently feeding the material to a weighing system through a spiral feeder, and then discharging the material to a pre-mixer;
s7, conveying the materials from the pre-mixer to a raw material distribution system, conveying one path of the materials to a vacuum feeding system, stacking the materials after passing through an automatic packaging system, and entering a finished product warehouse; and the other path is sent to a vacuum feeding system, is stacked through an airflow crushing system and an automatic packaging system and enters a finished product warehouse, and the finished product controls the magnetic substance not to exceed 30 PPb.
Further, in step S1, during the purification, if a lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10% to 50%, and if calcium oxide is added, the calcium oxide is powder with a mass fraction of more than 75% or calcium oxide slurry with a solid content of 10% to 55%.
Furthermore, the filter cake filtered by the filter press is rinsed by tap water or process water, the filter cake is purged by compressed air, the water content of the filter cake is less than or equal to 20%, and the rinsing water is returned again for size mixing.
Further, in step S2, water is added into the purified filter residue to prepare slurry with the solid content of 10% -70%, and then the step S1 is returned.
Further, in step S3, the causticized filter residue is added with water to prepare slurry with a solid content of 10% to 70%, and then the process returns to the purification process of step S2.
The invention has the following advantages:
1. the process for producing lithium hydroxide monohydrate by using salt lake ore takes salt lake ore as raw material, wherein the salt lake ore Li2SO4·H2The content of O reaches 80.1-92.1%, the average content is 85.1%, the process is used for producing the lithium hydroxide monohydrate by using the salt lake ore, the dilemma of insufficient lithium ore resources is solved, the risk of insufficient resistance resources of a production line is increased, and the equipment cost is saved.
2. The lithium hydroxide mother liquor is used for purification, so that the introduction of calcium ions can be greatly reduced, the content of the calcium ions in the product is reduced, the quality of the lithium hydroxide product is improved, meanwhile, calcium oxide is properly used as a purifying agent, calcium salt can be used as a filter cake in a filter pressing step, the impurity removal effect of purification is improved, and part of impurities are removed.
3. The lithium hydroxide mother liquor is used for causticizing instead of liquid caustic soda, so that the using amount of the liquid caustic soda can be reduced, the production cost is saved, external moisture is reduced, the circulation of water in a system is greatly reduced, and the operation cost is saved.
4. In the invention, no spodumene is used, so that the consumption of spodumene is reduced, and meanwhile, the process is simplified, so that the energy consumption is reduced.
Drawings
FIG. 1 is a process flow diagram of the present invention;
Detailed Description
The invention will be further described with reference to the accompanying drawings, but the scope of the invention is not limited to the following.
As shown in fig. 1, a process for producing lithium hydroxide monohydrate from salt lake ore comprises the following steps:
s1, mixing water with salt lake ore, wherein Li2The concentration of O is 30-45 g/L, the mixed and size-mixed liquid is purified by lithium hydroxide mother liquor or calcium oxide, the pH value is adjusted to 9-12, during purification, if the lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10-50%, the lithium hydroxide mother liquor is used for purification, the introduction of calcium ions can be greatly reduced, the content of the calcium ions in the product is reduced, so that the quality of the lithium hydroxide product is improved, if the calcium oxide is added, the calcium oxide is powder with the mass fraction of more than 75% or calcium oxide slurry with the solid content of 10-55%, the calcium oxide is properly used as a purifying agent, calcium salt can be used as a filter cake in a filter pressing step, the purifying effect is improved, part of impurities are removed, and impurities such as iron, manganese, aluminum and calcium in a filtered clear liquid are removed; then filtering by using a filter press to obtain a filtered clear solution, rinsing a filter cake filtered by the filter press by using tap water or process water, and purging the filter cake by using compressed air to ensure that the water content of the filter cake is less than or equal to 20%, and returning rinsing water for size mixing;
s2, filtering the clear filtrate obtained in the step S1 again to obtain purified liquid and purified filter residue, adding water into the purified filter residue to prepare slurry with the solid content of 10% -70%, returning to the step S1, causticizing the purified liquid by using 50% alkaline solution or crude mother liquor, so that the usage amount of liquid alkali can be reduced, the production cost is saved, external moisture is reduced, the circulation of water in the system is greatly reduced, the operation cost is saved, the pH value of the causticized solution is 11-14, and the temperature is normal temperature;
s3, filtering the causticized solution obtained in the step S2 to obtain causticized liquid and causticized filter residue, adding water into the causticized filter residue to prepare slurry with the solid content of 10-70%, and returning to the purification process of the step S2, wherein lithium Li hydroxide in the causticized liquid2Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;
s4, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;
s5, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating to 200-800 ℃, filtering a lithium hydroxide solution through a precision filter to remove a part of calcium ions, then performing evaporation concentration, crystallizing, centrifuging, re-melting, filtering through the precision filter, performing evaporation concentration after filtering, cooling, crystallizing and separating to obtain lithium hydroxide crystals, heating through a disc dryer to obtain lithium hydroxide monohydrate, and heating to 50-150 ℃;
s6, conveying the lithium hydroxide monohydrate obtained by heating the disc dryer to a vibrating screen through an air conveying device for particle screening, conveying the screened material to a vacuum feeding system for buffering, intermittently feeding the material to a weighing system through a spiral feeder, and then discharging the material to a pre-mixer;
s7, conveying the materials from the pre-mixer to a raw material distribution system, conveying one path of the materials to a vacuum feeding system, stacking the materials after passing through an automatic packaging system, and entering a finished product warehouse; and the other path is sent to a vacuum feeding system, is stacked through an airflow crushing system and an automatic packaging system and enters a finished product warehouse, and the finished product controls the magnetic substance not to exceed 30 PPb.
According to the invention, the salt lake ore is directly used for carrying out the process steps of size mixing, purification and impurity removal, causticization and impurity removal, freezing and sodium sulfate removal, evaporation and concentration, drying and the like to prepare the lithium hydroxide, so that the process steps of spodumene calcination are reduced, the consumption of spodumene is reduced, the predicament of spodumene mineral source shortage is relieved, and the energy consumption in the calcination process is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. A process for producing lithium hydroxide monohydrate by using salt lake ores is characterized by comprising the following steps: the method comprises the following steps:
s1, mixing water with salt lake ore, wherein Li2The concentration of O is 30-45 g/L, the mixed and size-mixed liquid is purified by lithium hydroxide mother liquor or calcium oxide, the pH value is adjusted to 9-12, and impurities of iron, manganese, aluminum and calcium in the filtered clear liquid are removed; then filtering by using a filter press to obtain filtered clear liquid;
s2, filtering the clear filtrate obtained in the step S1 again to obtain purified liquid and purified filter residues, causticizing the purified liquid by using 50% alkaline solution or crude product mother liquor, wherein the pH value of the causticized solution is 11-14, and the temperature is normal temperature;
s3, filtering the causticized solution obtained in the step S2 to obtain causticized liquid and causticized filter residue, wherein lithium hydroxide Li in the causticized liquid2Controlling the equivalent content of O to be 30-75 g/L, and filtering the causticized liquid through a precision filter to remove part of calcium ions;
s4, freezing and separating the filtered causticized liquid into sodium sulfate decahydrate and lithium hydroxide solution in a freezing workshop, wherein the freezing temperature is-5 to-20 ℃;
s5, purifying sodium sulfate decahydrate through evaporation concentration, heating to take out crystal water to obtain anhydrous sodium sulfate, heating to 200-800 ℃, filtering a lithium hydroxide solution through a precision filter to remove a part of calcium ions, then performing evaporation concentration, crystallizing, centrifuging, re-melting, filtering through the precision filter, performing evaporation concentration after filtering, cooling, crystallizing and separating to obtain lithium hydroxide crystals, heating through a disc dryer to obtain lithium hydroxide monohydrate, and heating to 50-150 ℃;
s6, conveying the lithium hydroxide monohydrate obtained by heating the disc dryer to a vibrating screen through an air conveying device for particle screening, conveying the screened material to a vacuum feeding system for buffering, intermittently feeding the material to a weighing system through a spiral feeder, and then discharging the material to a pre-mixer;
s7, conveying the materials from the pre-mixer to a raw material distribution system, conveying one path of the materials to a vacuum feeding system, stacking the materials after passing through an automatic packaging system, and entering a finished product warehouse; and the other path is sent to a vacuum feeding system, is stacked through an airflow crushing system and an automatic packaging system and enters a finished product warehouse, and the finished product controls the magnetic substance not to exceed 30 PPb.
2. The process for producing lithium hydroxide monohydrate from salt lake ore according to claim 1, wherein: in step S1, during purification, if a lithium hydroxide mother liquor is added, the concentration of the lithium hydroxide mother liquor is 10% to 50%, and if calcium oxide is added, the calcium oxide is powder with a mass fraction of more than 75% or calcium oxide slurry with a solid content of 10% to 55%.
3. The process for producing lithium hydroxide monohydrate from salt lake ore according to claim 2, wherein: rinsing the filter cake filtered by the filter press by using tap water or process water, blowing the filter cake by using compressed air to ensure that the water content of the filter cake is less than or equal to 20%, and returning rinsing water for size mixing.
4. The process for producing lithium hydroxide monohydrate from salt lake ore according to claim 1, wherein: in step S2, water is added into the purified filter residue to prepare slurry with the solid content of 10-70%, and then the step S1 is returned.
5. The process for producing lithium hydroxide monohydrate from salt lake ore according to claim 1, wherein: in step S3, adding water into the causticized filter residue to prepare slurry with solid content of 10-70%, and then returning to the purification process of step S2.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115786734A (en) * | 2022-11-25 | 2023-03-14 | 厦门紫金矿冶技术有限公司 | Method for recovering lithium from brine concentrated crystal salt |
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