CN117385176A - System for extracting valuable lithium element from aluminum electrolysis solid wastewater treatment slag - Google Patents
System for extracting valuable lithium element from aluminum electrolysis solid wastewater treatment slag Download PDFInfo
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- CN117385176A CN117385176A CN202311338643.2A CN202311338643A CN117385176A CN 117385176 A CN117385176 A CN 117385176A CN 202311338643 A CN202311338643 A CN 202311338643A CN 117385176 A CN117385176 A CN 117385176A
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- aluminum electrolysis
- air inlet
- water treatment
- extracting valuable
- waste water
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- 239000002893 slag Substances 0.000 title claims abstract description 51
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 32
- 238000005868 electrolysis reaction Methods 0.000 title claims abstract description 30
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 20
- 239000007787 solid Substances 0.000 title claims abstract description 16
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims description 10
- 238000002386 leaching Methods 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 30
- 239000012535 impurity Substances 0.000 claims abstract description 25
- 239000002253 acid Substances 0.000 claims abstract description 17
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 239000002910 solid waste Substances 0.000 claims abstract description 10
- 238000000498 ball milling Methods 0.000 claims abstract description 9
- 150000004673 fluoride salts Chemical class 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims description 17
- 238000005192 partition Methods 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000002425 crystallisation Methods 0.000 claims description 4
- 230000008025 crystallization Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 125000001153 fluoro group Chemical class F* 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 17
- 229910052799 carbon Inorganic materials 0.000 abstract description 15
- 239000002002 slurry Substances 0.000 abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 239000002699 waste material Substances 0.000 abstract description 7
- 238000011084 recovery Methods 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 description 18
- 238000001556 precipitation Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 229910052731 fluorine Inorganic materials 0.000 description 7
- 239000000706 filtrate Substances 0.000 description 6
- 238000006386 neutralization reaction Methods 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 150000002221 fluorine Chemical class 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 2
- IRPGOXJVTQTAAN-UHFFFAOYSA-N 2,2,3,3,3-pentafluoropropanal Chemical compound FC(F)(F)C(F)(F)C=O IRPGOXJVTQTAAN-UHFFFAOYSA-N 0.000 description 1
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminum fluoride Inorganic materials F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
- C22B26/10—Obtaining alkali metals
- C22B26/12—Obtaining lithium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to waste residue recovery, and provides a system for extracting valuable lithium elements from aluminum electrolysis solid waste water treatment residues, which comprises a ball milling system, a slurry mixing system, an alkaline leaching system, an acid leaching system, a fluoride salt directional conversion system, a impurity removal system and a post-treatment system which are connected in sequence; the alkaline leaching system is connected with the fluoride salt directional conversion system. The system for extracting the valuable lithium elements from the aluminum electrolysis solid wastewater treatment slag can efficiently extract the valuable lithium elements in the water treatment slag, and remarkably improves the economic benefits of harmless treatment and comprehensive utilization of aluminum electrolysis overhaul slag and carbon slag.
Description
Technical Field
The invention relates to the technical field of waste residue recovery, in particular to a system for extracting valuable lithium elements from aluminum electrolysis solid waste water treatment residues.
Background
The overhaul slag is waste slag generated by maintaining and replacing the cathode lining of the electrolytic cell in the electrolytic aluminum production process, and is subdivided into three major categories of waste cathodes, waste refractory materials and mixtures according to the actual aluminum electrolysis production.
The carbon residue is a substance produced by carbon particle shedding caused by uneven combustion and selective oxidation of a carbon anode, and the main components of the aluminum electrolysis carbon residue are carbon and electrolyte, generally containing 20-30% of carbon and 60-70% of electrolyte.
Aiming at aluminum electrolysis overhaul slag, carbon slag disposal and comprehensive resource utilization, a great deal of research is carried out on college students in China. At present, the prior art at home and abroad can be divided into two major categories of wet treatment and fire treatment for harmless treatment and comprehensive utilization of resources of the aluminum electrolysis dangerous waste residues. The wet treatment process mainly comprises a water leaching method, an alkaline leaching method, an acid leaching method and an acid-alkali combined leaching method. The pyrogenic process mainly adopts high-temperature oxygen-enriched combustion for harmless treatment, or uses waste cathode as carbonaceous material capable of utilizing heat value resources, or recovers electrolyte at high temperature.
In the processes of aluminum electrolysis overhaul slag and carbon slag cooperative treatment and resource utilization, alkali leaching liquid and acid leaching liquid are subjected to neutralization precipitation to prepare cryolite, aluminum fluoride and aluminum oxide products, and the neutralized precipitation liquid contains higher Fe, si, al and other elements, so that the safe and efficient operation of a nanofiltration system is ensured, and slag removal treatment is required to be carried out on the neutralized precipitation liquid before the neutralized precipitation liquid enters the nanofiltration system. However, in the deslagging treatment process, valuable Li elements in the liquid after neutralization and precipitation enter water treatment slag, and a great deal of loss of the valuable Li elements can be caused. In order to improve the utilization rate of valuable Li elements in the processes of the cooperative treatment and the resource utilization of the overhaul slag and the carbon slag, the technology for extracting the valuable Li elements from the water treatment slag of the aluminum electrolysis overhaul slag is necessary to be researched.
Disclosure of Invention
The invention aims to provide a system for extracting valuable lithium elements from aluminum electrolysis solid wastewater treatment slag, which can efficiently extract the valuable lithium elements in the water treatment slag, and remarkably improve the harmless treatment and comprehensive utilization economic benefits of aluminum electrolysis overhaul slag and carbon slag.
The embodiment of the invention is realized by the following technical scheme: the system for extracting valuable lithium elements from the aluminum electrolysis solid wastewater treatment slag comprises a ball milling system, a slurry mixing system, an alkaline leaching system, an acid leaching system, a fluorine salt directional conversion system, a impurity removal system and a post-treatment system which are connected in sequence; the alkaline leaching system is connected with the fluoride salt directional conversion system.
Further, the post-treatment system comprises an evaporation concentration system, a cooling crystallization system and a washing and drying system.
Further, the impurity removal system comprises a mixing tank, filter cloth attached to the inner side wall and the inner bottom wall of the mixing tank, and an air inlet device arranged below the inside of the mixing tank; the filter cloth is of a cylindrical structure with the lower end closed.
Further, the air inlet device comprises an air inlet hole formed in the bottom wall of the mixing tank, an air inlet pipe arranged at the air inlet hole, and an air supply device connected with the air inlet pipe.
Further, the air inlet device further comprises a baffle plate arranged at the air inlet hole and a spring arranged in the air inlet pipe and used for supporting the baffle plate.
Further, the air inlet device further comprises a partition plate arranged in the air inlet pipe and a plurality of air holes formed in the partition plate; the spring is arranged between the baffle plate and the baffle plate.
Further, the diameter of the upper end face of the baffle is larger than that of the lower end face.
Further, the impurity removal system further comprises a compression ring arranged at the inner bottom edge of the filter cloth.
Further, the upper side of the pressing ring is provided with a plurality of pull rods, the upper ends of the pull rods are provided with hooks, and the hooks are hung on the upper side wall of the mixing tank.
The technical scheme of the embodiment of the invention has at least the following advantages and beneficial effects: the invention relates to a system for extracting valuable lithium elements from aluminum electrolytic solid wastewater treatment slag, which comprises a ball milling system, a slurry mixing system, an alkaline leaching system, an acid leaching system, a fluorine salt directional conversion system, a solid-liquid separation system, a neutralization precipitation system, an impurity removal system, a residue removal system, a post-treatment system, a filter residue dissolving system, a Fe, si, F, AI, ca, mg and other impurities removing system, wherein the overhaul slag, the carbon slag and the like are crushed and ground into powder by the ball milling system, the slurry is sent into the slurry mixing system to be prepared into slurry, the slurry is leached by alkaline liquor, the solid is sent into the acid leaching system after filtration, the solid is leached by the acid liquor, the alkaline leaching solution and the acid leaching solution are sent into the fluorine salt directional conversion system, air is introduced into the solution which is needed to be precipitated in the impurity removal system, and the impurities such as Fe, si, F, AI, ca, mg are removed, the Li is together precipitated into the filter residue, and the filter residue is dissolved in the solution in the post-treatment system, and the impurities such as Fe, si, F, AI, ca, mg are removed, so that the filtrate with higher Li content is obtained. Concentrating the filtrate to obtain the high-concentration Li-containing solution. Through the system, the efficient extraction of valuable lithium elements in the water treatment slag can be realized, and the harmless treatment and comprehensive utilization economic benefits of the aluminum electrolysis overhaul slag and the carbon slag are obviously improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system for extracting valuable lithium elements from aluminum electrolysis solid wastewater treatment slag according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a system for removing impurities according to an embodiment of the present invention;
FIG. 3 is a schematic view of the structure of the interior of a mixing tank according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a filter cloth portion according to an embodiment of the present invention;
FIG. 5 is a schematic view of a press ring portion according to an embodiment of the present invention;
fig. 6 is an enlarged view of a portion a in fig. 3.
Icon: 10-ball milling system, 20-slurry mixing system, 30-alkaline leaching system, 40-acid leaching system, 50-fluoride salt directional conversion system, 60-impurity removal system, 61-mixing tank, 62-air inlet hole, 63-air inlet pipe, 64-baffle, 65-spring, 66-baffle, 67-air vent, 68-air supply device, 69-filter cloth, 610-compression ring, 611-pull rod, 612-hook and 70-post-treatment system.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which a product of the application is conventionally put in use, it is merely for convenience of describing the present invention and simplifying the description, and it is not indicated or implied that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly stated and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Examples
The system for extracting valuable lithium elements from the aluminum electrolysis solid wastewater treatment slag in the embodiment comprises a ball milling system 10, a slurry mixing system 20, an alkaline leaching system 30, an acid leaching system 40, a fluorine salt directional conversion system 50, a impurity removal system 60 and a post-treatment system 70 which are sequentially connected, as shown in fig. 1-6, which are further described below with reference to the specific embodiments; the alkaline leaching system 30 is connected with a fluoride salt directional conversion system 50. Specifically, the ball milling system 10 is used for crushing and grinding overhaul slag, carbon slag and the like into powder, then the powder is sent to the pulp mixing system 20 to be prepared into pulp, the pulp is sent to the alkaline leaching system 30, alkaline liquor is used for leaching the pulp, solids are sent to the acid leaching system 40 after filtration, acid liquor is used for leaching the solids, alkaline leaching solution and acid leaching solution are sent to the fluoride directional conversion system 50 (namely, a neutralization precipitation system and a precipitation reaction occur in the neutralization system), the neutralized precipitation liquid is sent to the impurity removing system 60 after solid-liquid separation, air is introduced into the precipitated liquid in the impurity removing system 60, flocculating agent is added to remove Fe, si, F, AI, ca, mg and other impurities, L i is together precipitated into filter residues, the filter residues are dissolved in the solution in the post-treatment system 70, and Fe, si, F, AI, ca, mg and other impurities are removed, so that filtrate with higher Li content can be obtained. Concentrating the filtrate to obtain a high-concentration L i-containing solution. Through the system, the efficient extraction of valuable lithium elements in the water treatment slag can be realized, and the harmless treatment and comprehensive utilization economic benefits of the aluminum electrolysis overhaul slag and the carbon slag are obviously improved.
The post-treatment system 70 in this embodiment includes an evaporation concentration system, a cooling crystallization system, and a washing and drying system. Specifically, the high-concentration Li-containing solution can be further evaporated, concentrated and crystallized through an evaporation concentration system and a freezing crystallization system to obtain a high-concentration lithium sulfate solution, the lithium sulfate solution and the sodium carbonate solution are mixed to prepare lithium carbonate, and the lithium carbonate is washed and dried through a washing and drying system to obtain the industrial-grade lithium carbonate.
The impurity removal system 60 in the present embodiment includes a mixing tank 61, a filter cloth 69 attached to the inner side wall and the inner bottom wall of the mixing tank 61, and an air intake device provided inside and below the mixing tank 61; the filter cloth 69 has a cylindrical structure with a closed lower end. Specifically, air is continuously introduced into the mixing tank 61 through the air inlet means, thereby accelerating the precipitation of the solution. Further, since the filter cloth 69 is provided, the gas discharged from the gas inlet device is automatically dispersed when passing through the filter cloth 69, and thus, the gas can be dispersed in the solution, and not only the solution can be stirred but also the gas can be contacted with the solution. After the completion of the precipitation, the filter cloth 69 is directly lifted up, and the solution can be filtered.
The air intake device in this embodiment includes an air intake hole 62 formed in the bottom wall of the mixing tank 61, an air intake pipe 63 provided at the air intake hole 62, and an air supply device 68 connected to the air intake pipe 63. The air intake device further includes a baffle plate 64 provided at the air intake hole 62, and a spring 65 provided in the air intake pipe 63 for supporting the baffle plate 64. Specifically, when air supply is required, the air supply device 68 feeds high-pressure air into the air intake pipe 63, and the high-pressure air pushes the baffle plate 64 open and enters the mixing tank 61 from the gap between the baffle plate 64 and the air intake hole 62. When the air intake is not required, the air supply device 68 is closed, and the baffle plate 64 blocks the air intake hole 62 under the tension of the spring 65, preventing the liquid in the mixing tank 61 from entering the air intake pipe 63. Further, since the baffle plate 64 is pressed by the filter cloth 69, even if the liquid in the mixing tank 61 is stirred by the stirring device, the flow of the liquid does not affect the baffle plate 64 and the baffle plate 64 is not displaced.
The air inlet device in this embodiment further comprises a partition plate 66 arranged in the air inlet pipe 63, and a plurality of air holes 67 arranged on the partition plate 66; the spring 65 is provided between the baffle 66 and the baffle 64. Specifically, the partition 66 serves to block the liquid entering the air inlet pipe 63, wherein the air holes 67 are small enough so that the liquid does not easily penetrate the partition 66.
The diameter of the upper end surface of the baffle plate 64 in this embodiment is larger than the diameter of the lower end surface. Specifically, as shown in fig. 6, the baffle plate 64 can be better caught at the upper end of the ventilation hole 67.
The impurity removal system 60 in this embodiment further includes a pressure ring 610 provided at the inner bottom edge of the filter cloth 69. Specifically, the compression ring 610 is used to press the filter cloth 69 to avoid shaking.
The upper side of the compression ring 610 in this embodiment is provided with a plurality of pull rods 611, the upper ends of the pull rods 611 are provided with hooks 612, and the hooks 612 are hung on the upper side wall of the mixing tank 61. Specifically, the hooks 612 and the tie rods 611 can fix the position of the compression ring 610, and the tie rods 611 can also abut against the side walls of the filter cloth 69.
To sum up, in the system for extracting valuable lithium elements from aluminum electrolysis solid wastewater treatment slag, a ball milling system 10 is used for crushing and grinding overhaul slag, carbon slag and the like into powder, then the powder is sent to a slurry mixing system 20 to be prepared into slurry, the slurry is sent to an alkaline leaching system 30, alkaline liquor is used for leaching the slurry, solids are sent to an acid leaching system 40 after filtration, acid liquor is used for leaching the solids, alkaline leaching solution and acid leaching solution are sent to a fluoride salt directional conversion system 50, liquid after solid-liquid separation is sent to a impurity removal system 60, air is introduced into the liquid after precipitation is needed to be removed in the impurity removal system 60, flocculating agents are added to remove impurities such as Fe, S i, F, AI, ca, mg and the like, L i is together precipitated into filter residues, the filter residues are dissolved in a solution in a post-treatment system 70, and impurities such as Fe, si, F, A I, ca, mg and the like are removed, so that filtrate with higher Li content can be obtained. Concentrating the filtrate to obtain the high-concentration Li-containing solution. Through the system, the efficient extraction of valuable lithium elements in the water treatment slag can be realized, and the harmless treatment and comprehensive utilization economic benefits of the aluminum electrolysis overhaul slag and the carbon slag are obviously improved.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A system for extracting valuable lithium elements from aluminum electrolysis solid wastewater treatment slag is characterized in that: comprises a ball milling system (10), a pulp mixing system (20), an alkaline leaching system (30), an acid leaching system (40), a fluorine salt directional conversion system (50), a impurity removal system (60) and a post-treatment system (70) which are connected in sequence;
the alkaline leaching system (30) is connected with the fluoride salt directional conversion system (50).
2. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 1, wherein the system comprises the following components: the post-treatment system (70) comprises an evaporation concentration system, a cooling crystallization system and a washing and drying system.
3. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 1, wherein the system comprises the following components: the impurity removal system (60) comprises a mixing tank (61), filter cloth (69) attached to the inner side wall and the inner bottom wall of the mixing tank (61), and an air inlet device arranged below the inside of the mixing tank (61); the filter cloth (69) is of a cylindrical structure with a closed lower end.
4. A system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 3, wherein: the air inlet device comprises an air inlet hole (62) formed in the bottom wall of the mixing tank (61), an air inlet pipe (63) arranged at the air inlet hole (62), and an air supply device (68) connected with the air inlet pipe (63).
5. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 4, wherein the system comprises: the air inlet device further comprises a baffle plate (64) arranged at the air inlet hole (62), and a spring (65) arranged in the air inlet pipe (63) and used for supporting the baffle plate (64).
6. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 5, wherein the system comprises: the air inlet device further comprises a partition plate (66) arranged in the air inlet pipe (63), and a plurality of air holes (67) formed in the partition plate (66);
the spring (65) is arranged between the baffle plate (66) and the baffle plate (64).
7. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 5, wherein the system comprises: the diameter of the upper end face of the baffle plate (64) is larger than that of the lower end face.
8. A system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 3, wherein: the impurity removal system (60) further comprises a compression ring (610) arranged at the inner bottom edge of the filter cloth (69).
9. The system for extracting valuable lithium element from aluminum electrolysis solid waste water treatment slag according to claim 8, wherein the system comprises: the upper side of the compression ring (610) is provided with a plurality of pull rods (611), the upper ends of the pull rods (611) are provided with hooks (612), and the hooks (612) are hung on the upper side wall of the mixing tank (61).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311338643.2A CN117385176A (en) | 2023-10-16 | 2023-10-16 | System for extracting valuable lithium element from aluminum electrolysis solid wastewater treatment slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311338643.2A CN117385176A (en) | 2023-10-16 | 2023-10-16 | System for extracting valuable lithium element from aluminum electrolysis solid wastewater treatment slag |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117385176A true CN117385176A (en) | 2024-01-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311338643.2A Pending CN117385176A (en) | 2023-10-16 | 2023-10-16 | System for extracting valuable lithium element from aluminum electrolysis solid wastewater treatment slag |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117385176A (en) |
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- 2023-10-16 CN CN202311338643.2A patent/CN117385176A/en active Pending
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