36 results about "Lithium bicarbonate" patented technology

This invention provides a continuous production apparatus for preparing lithium bicarbonate using CO2, relating to the field of lithium carbonate preparation technology. It includes a feeding system, a mixing reaction unit, a clarification and separation unit, a frame, and a control system. The feeding system's organic phase feeding unit, aqueous phase feeding unit, and gas inlet unit enable precise proportioning and conveying of multiple materials. The preparation container of the mixing reaction unit is divided into multiple stirring chambers by annular baffles, each corresponding to a set of impellers. Optimized impeller parameters and axial spacing design, coupled with a microporous aeration device at the bottom of the preparation container, form a highly efficient composite flow field, enhancing three-phase mixing efficiency. The clarification and separation tank improves the gradient separation of the gas, liquid, and liquid phases through filter baffles. Through the coordinated operation of these systems, mixing reaction and product separation can be efficiently completed, achieving continuous production of lithium bicarbonate solution, ensuring product uniformity, and significantly improving CO2 utilization and gas-liquid mass transfer efficiency, which is of great significance for the industry's green and low-carbon transformation.

The preparation method comprises the following steps: mixing a lithium source material, water, a first solvent and quaternary amine alkali, reacting the quaternary amine alkali with carbon dioxide in a reaction atmosphere containing carbon dioxide to generate HCO3 <->, reacting the HCO3 <-> with lithium ions in the lithium source material to generate lithium bicarbonate, and collecting a water phase after the reaction; decomposing lithium bicarbonate in the water phase to generate lithium carbonate, collecting a solid phase, and decomposing lithium carbonate in the solid phase to generate lithium oxide to obtain an intermediate; dissolving quaternary ammonium iodide in a second solvent, adding the intermediate, converting the lithium oxide into lithium hydroxide, carrying out ion exchange on the lithium hydroxide and the quaternary ammonium iodide to generate lithium iodide, and collecting a liquid phase; and collecting the lithium iodide in the liquid phase. According to the present invention, based on the characteristics of the specific quaternary ammonium base and the quaternary ammonium iodide salt, the Li in the lithium source material is selectively reinforced, carbonized and leached, the anion impurities in the lithium source material are removed, the anion exchange in the organic phase is achieved, and the high-purity anhydrous lithium iodide is prepared.

The invention discloses a method for preparing a silicon alloy and lithium carbonate by taking lithium ore as a raw material and application of the silicon alloy and the lithium carbonate. The method comprises the following steps: S1, carrying out high-temperature carbon thermal reduction smelting treatment on a mixed raw material, and cooling to obtain a silicon alloy and a lithium-rich product; s2, carrying out mixed acid roasting, leaching, impurity removal and lithium precipitation treatment on the lithium-rich product by using sulfuric acid, and carrying out centrifugal separation to obtain crude lithium carbonate; s3, the crude lithium carbonate is placed in deionized water, CO2 gas is introduced for a carbonization reaction, a lithium bicarbonate solution is obtained, then the lithium bicarbonate solution is subjected to thermal decomposition treatment, and final lithium carbonate is obtained. According to the method, the iron oxide with low cost is adopted as the raw material, the silicon alloy and the lithium-rich product are prepared through high-temperature reduction of the lithium ore, then the lithium element is extracted from the lithium-rich product through the wet process technology, and multi-component comprehensive utilization of lithium, silicon and aluminum resources in the lithium ore is achieved.

Provided is a method for producing a lithium carbonate from a basic lithium- and aluminum-containing waste liquid generated during a positive electrode material production process, the method comprising the steps of: (a) filtering the waste liquid to remove metal solids; (b) injecting carbon dioxide into the waste liquid removed of the metal solids, thereby converting a lithium hydroxide into a lithium bicarbonate; (c) adding an anion exchange resin to the lithium bicarbonate-containing waste liquid to convert a lithium sulfate into a lithium hydroxide; (d) injecting carbon dioxide into the lithium hydroxide-containing waste liquid to convert the lithium hydroxide into a lithium carbonate; and (e) concentrating the lithium carbonate-containing waste liquid using an evaporator and then recovering a solid lithium carbonate.

This invention discloses a method for the green recycling of all components of waste lithium iron phosphate batteries, belonging to the field of new energy resource recycling technology. The invention involves crushing and slicing the waste batteries in an aqueous solution continuously purged with carbon dioxide, prioritizing the non-destructive separation of the negative electrode graphite; the metal sheets are sorted to obtain the iron shell, separator, copper foil, and aluminum foil containing powder; a gas-liquid-solid Fenton reaction system is constructed using carbon dioxide, hydrogen peroxide, and lithium iron phosphate, simultaneously degrading PVDF and electrolyte, and performing dealuminization and lithium impregnation under mild, acid- and alkali-free conditions; the slurry is subjected to two-stage sieving to obtain delithiated iron phosphate powder, and lithium bicarbonate solution is heated and decomposed to obtain lithium carbonate, achieving a closed-loop carbon dioxide recycling process. This invention solves the problems of high energy consumption from high-temperature roasting, significant pollution from strong acids and alkalis, difficulty in separating mixed components, and damage to graphite and metal foil in traditional recycling methods. It achieves high-purity recycling of all components—negative electrode graphite, copper foil, aluminum foil, iron phosphate, and lithium—with low energy consumption and no high-salt wastewater, making it suitable for large-scale application.

A process for purifying crude lithium carbonate includes carbonation of a slurry of the crude lithium carbonate feed in water with exhaust flue gas to form an aqueous solution of lithium bicarbonate, followed by separation of the solution from insoluble impurities, and depressurization and heating of the separated solution to precipitate solid lithium carbonate and evolve carbon dioxide. The process produces battery-grade purified lithium carbonate and purified carbon dioxide which can be captured for further use, while reducing carbon dioxide emissions from exhausted flue gas and avoiding the need to use pre-purified carbon dioxide as a reactant.

This invention relates to a method for removing lithium carbonate scale from the surface of equipment such as crystallization apparatus and evaporation apparatus. A non-acidic cleaning solution, such as water, is introduced into the apparatus. Once inside the apparatus, CO2 is injected and mixed with the cleaning solution. This converts the lithium carbonate scale into lithium bicarbonate, which dissolves in the cleaning solution. Subsequently, the cleaning solution containing the dissolved lithium bicarbonate is discharged from the apparatus.

A preparation method of lithium iodide and a solid-state battery, the preparation method comprising mixing a lithium source material, water, a first solvent and a quaternary amine base, reacting the quaternary amine base with carbon dioxide under a reaction atmosphere containing carbon dioxide to generate HCO3 ‑ , HCO3 ‑ reacting with lithium ions in the lithium source material to generate lithium bicarbonate, collecting an aqueous phase after the reaction; decomposing the lithium bicarbonate in the aqueous phase to generate lithium carbonate, collecting a solid phase, decomposing the lithium carbonate in the solid phase to generate lithium oxide to obtain an intermediate; dissolving a quaternary ammonium iodide salt in a second solvent and adding the intermediate, converting the lithium oxide into lithium hydroxide, and performing ion exchange between the lithium hydroxide and the quaternary ammonium iodide salt to generate lithium iodide, collecting a liquid phase; and collecting the lithium iodide in the liquid phase. Based on the characteristics of the specific quaternary amine base and the quaternary ammonium iodide salt, the application selectively enhances carbonization leaching of Li in the lithium source material, removes anion impurities in the lithium source material, and also realizes anion exchange in an organic phase and preparation of high-purity anhydrous lithium iodide.

A method for preparing lithium bis(fluorosulfonyl)imide, includes reacting bis(fluorosulfonyl)imide with lithium carbonate in a mixed organic solvent to obtain lithium bis(fluorosulfonyl)imide after post-treatment. In the synthetic route of the lithium bis(fluorosulfonyl)imide, the reaction process stays at the stage of lithium bicarbonate, so there is little water in the reaction system, and it is very easy to recover the generated lithium bicarbonate. The process is simple and can be used to prepare lithium bis(fluorosulfonyl)imide of high quality at a high yield.

The invention provides a waste lithium battery positive electrode material efficient leaching method based on electron beam rapid oxidation and application of the waste lithium battery positive electrode material efficient leaching method, and relates to the field of battery recycling. The leaching method comprises the following steps: S1, mixing black powder with water and carboxylate to prepare first slurry; and S2, carrying out electron beam irradiation treatment on the first slurry, introducing carbon dioxide, and carrying out solid-liquid separation to obtain a first lithium bicarbonate solution. Iron ions in lithium iron phosphate are rapidly oxidized by using an electron beam irradiation technology, and the use of hydrogen peroxide is reduced. Meanwhile, the effect of promoting lithium ion leaching can be achieved at normal temperature through electron beam irradiation, the requirement for the temperature in wet leaching is lowered, and therefore steam consumption is reduced.

The utility model discloses a kind of lithium bicarbonate continuous high-efficiency pyrolysis devices, comprising: main reactor, for lithium bicarbonate solution to carry out pyrolysis reaction;First heat exchanger, with main reactor communication, the gas after lithium bicarbonate solution pyrolysis in main reactor enters first heat exchanger;Transfer container, with main reactor communication, transfer container is used to collect pyrolysis mother liquor after lithium bicarbonate solution pyrolysis;Second heat exchanger, with transfer container connection, transfer container is used to supply pyrolysis mother liquor to second heat exchanger;Supply equipment, for supplying lithium bicarbonate solution to first heat exchanger, second heat exchanger;Three-way pipe, for communicating first heat exchanger, second heat exchanger and main reactor, first heat exchanger, second heat exchanger supply lithium bicarbonate solution in main reactor by three-way pipe.The lithium bicarbonate continuous high-efficiency pyrolysis device of the application utilizes the waste heat of pyrolysis device, effectively reduces resource waste.

A method for producing lithium carbonate, according to the present invention, comprises the steps of: preparing an ore containing lithium; calcining the ore containing lithium; mixing the calcined ore containing lithium with sodium carbonate and water and performing high-temperature high-pressure leaching so as to obtain a leachate containing lithium carbonate particles; bicarbonating the leachate so as to obtain a lithium bicarbonate aqueous solution; solid-liquid separating the lithium bicarbonate aqueous solution so as to obtain a lithium bicarbonate filtrate and a residue; mixing the residue with hydrochloric acid so as to obtain sodium chloride; subjecting the sodium chloride to an electrochemical reaction; and carbonating sodium hydroxide obtained after the electrochemical reaction.

The present application relates to a kind of surface carbonation modified iron-doped nickel oxide preparation method and the method of decomposing ozone, the preparation method comprises the following steps: adding precipitant to the aqueous solution of nickel-containing iron precursor, hydrothermal reaction is carried out, precursor material nickel-iron layered double hydroxide is obtained, calcination, the aqueous solution of the obtained iron-doped nickel oxide and modifier is mixed uniformly, hydrothermal reaction is carried out;Wherein, the modifier is one or more of urea, ammonium carbonate, ammonium bicarbonate, sodium carbonate, sodium bicarbonate, potassium carbonate, potassium bicarbonate, lithium carbonate, lithium bicarbonate, sodium hydroxide, potassium hydroxide and lithium hydroxide.The preparation method of the present application is simple, does not need special condition, and the iron-doped nickel oxide catalyst modified by surface carbonation is rich in active site, and can show high and stable ozone decomposition efficiency in high humidity or extremely high humidity environment.

The invention provides a lithium bicarbonate thermal decomposition system, which belongs to the technical field of lithium carbonate production, and comprises a preheater, a pyrolysis tower, a steam utilization assembly and a dense separation assembly, the interior of the preheater is used for introducing a lithium bicarbonate solution and indirectly preheating the lithium bicarbonate solution by using a high-temperature fluid; the pyrolysis tower is connected with the preheater, the pyrolysis tower is connected with a first heater in parallel, and the interior of the first heater is used for introducing high-temperature steam to indirectly heat a lithium bicarbonate solution, so that the lithium bicarbonate solution is decomposed into lithium carbonate slurry and mixed steam; the steam utilization assembly is connected with the pyrolysis tower and the first heater, so that the first heater indirectly heats the lithium bicarbonate solution; and the dense separation assembly is connected with the pyrolysis tower and is used for thickening the lithium carbonate slurry and separating out pure lithium carbonate. According to the lithium bicarbonate thermal decomposition system provided by the invention, the lithium bicarbonate solution is heated by recycling mixed steam generated by pyrolysis, so that the energy utilization rate is increased, and the operation cost of the system is reduced.

The present application relates to a method for co-production of lithium carbonate series products from lithium-containing solution. The method uses purified sodium carbonate solution to precipitate lithium carbonate, which is then converted into lithium bicarbonate solution, filtered and decarburized, and through optimization of conventional purification process steps and parameters, high-purity lithium carbonate, battery-grade lithium carbonate and industrial-grade lithium carbonate products are obtained without introducing additional high-cost purification steps such as ion exchange resin / membrane. The process maximizes the use of lithium-containing solution, shortens the process flow and time, and has good economic benefits. At the same time, the by-products of each stage of the scheme can be reused, only a small amount of waste solution is produced, which can realize the recycling of mother liquor, improve the comprehensive yield of products, and effectively reduce the comprehensive cost.

The invention discloses a preparation method and application of high-purity brine lithium carbonate. According to the method, the purity bottleneck of salt lake lithium extraction is broken through, industrial sodium carbonate is replaced with ammonia gas and carbon dioxide, and introduction of exogenous impurities is eradicated from the source; by combining dynamic pH regulation and high-temperature ionized water washing, co-precipitation and adsorption of sodium and other impurities are effectively inhibited, so that the purity of a lithium carbonate product stably reaches 99.9% or above, the requirement of a high-end lithium battery is met, and the additional value is remarkably improved. According to the process, the system is spontaneously heated to 90 DEG C or above by utilizing ammonia gas dissolution heat release, so that rapid decomposition of an intermediate product lithium bicarbonate is promoted, and the reaction rate is increased. Under the condition, the material liquid does not need to be greatly diluted to keep the purity, and the single precipitation conversion rate of the lithium is greatly improved to 91-96% and is obviously superior to the level of about 85% in the traditional process. Carbon dioxide is used as a carbon source, process conditions are mild, high-pressure equipment is not needed, follow-up separation and wastewater treatment processes are simplified, and the method has the advantages of greenness, low carbon and high industrial feasibility.

The invention belongs to the technical field of lithium resource extraction, and particularly discloses an extraction agent and an extraction system suitable for low-temperature lithium extraction and carbon dioxide reverse extraction and a lithium extraction method. The structure of the extracting agent is shown in the specification, wherein R is C1-C15 alkyl or C1-C15 aryl. The lithium carbonate is mixed with a synergistic extraction agent and an organic diluent to obtain a lithium extraction system, the lithium extraction system can perform multi-stage counter-current extraction lithium extraction on a lithium-containing alkaline solution, a lithium bicarbonate solution is obtained after washing and carbon dioxide reverse extraction, and battery-grade lithium carbonate is obtained after the lithium bicarbonate solution is post-treated. The extracting agent disclosed by the invention is relatively weak in acidity and easy in reverse extraction, and can improve the utilization efficiency of carbon dioxide and shorten the reaction time; the extraction system has the advantages of no emulsification, high load and low solution loss under a low-temperature condition; and the solubility of lithium bicarbonate obtained after reverse extraction is high, so that the reduction of the water amount of the lithium bicarbonate product and the energy consumption required by subsequent heat treatment are facilitated.

A coated active material (100) of the present disclosure includes: a positive electrode active material (11); lithium hydrogen carbonate present on a surface of the positive electrode active material (11); and a coating layer (12) coating at least a portion of the surface of the positive electrode active material (11). The coating layer (12) includes a lithium-containing fluoride. When a mass of the lithium hydrogen carbonate present on the surface of the positive electrode active material (11) is measured by thermogravimetry-mass spectrometry, a proportion R1 of the mass of the lithium hydrogen carbonate in a mass of the positive electrode active material (11) is 130 ppm or more and 580 ppm or less.

The application provides a method for preparing lithium dihydrogen phosphate by adopting extraction-CO2 stripping, and the method comprises the following steps: mixing calcium hydroxide and a lithium sodium solution, removing impurities by heating to obtain a decontaminated solution; adjusting the pH value of the decontaminated solution, and performing solid-liquid separation to obtain a refined lithium-containing solution; countercurrently extracting the refined lithium-containing solution to obtain a lithium-loaded organic phase and a raffinate aqueous phase; using carbon dioxide gas to extract a mixed solution of water and the lithium-loaded organic phase, and performing phase separation to obtain an aqueous phase and a regenerated organic phase; performing oil removal and precision filtration on the aqueous phase in sequence to obtain a lithium bicarbonate solution; mixing phosphoric acid and the lithium bicarbonate solution, and after the reaction is completed, performing concentration, cooling crystallization, solid-liquid separation and drying to obtain lithium dihydrogen phosphate. The application removes impurities by using calcium hydroxide in combination with extraction and CO2 stripping, and the operation is simple, no harmful waste water and waste gas are generated, and the regenerated organic phase can be recycled, so that the cost of preparing lithium dihydrogen phosphate is reduced.

The application specifically discloses a method for preparing lithium carbonate from battery recyclates, and the method comprises the following steps: mixing battery recyclates and first residue, wherein the battery recyclates comprise lithium-containing positive electrode materials and electrolyte, and the first residue comprises residual water, residual sulfuric acid and solid matters; then pyrolyzing at a temperature of 260-350 DEG C to obtain a pyrolysis mixture; reducing and roasting the pyrolysis mixture in the presence of a reducing agent to obtain a roasting product and a reduction tail gas; contacting the roasting product with an acid solution and carbon dioxide gas to obtain a lithium bicarbonate solution, and evaporating and decomposing the lithium bicarbonate solution to obtain lithium carbonate. The preparation method provided by the application has small pollution, low cost and good economy.

The utility model discloses a kind of battery-grade lithium carbonate pyrolysis devices of uniform granularity, including pyrolysis tower, reaction cavity is inside pyrolysis tower, inlet, discharge port and exhaust port are equipped with and communicate with reaction cavity on pyrolysis tower, lithium bicarbonate solution is added into reaction cavity from inlet, it is decomposed into lithium carbonate and carbon dioxide, water in reaction cavity, carbon dioxide produced by pyrolysis is directly discharged from exhaust port, solid-liquid mixture formed after pyrolysis is discharged from discharge port, by installing pressure sensor in reaction cavity, install exhaust valve in exhaust port, realize the pressure regulation in reaction cavity, maintain the constant-voltage environment in reaction cavity, avoid lithium bicarbonate solution in reaction cavity local supersaturation, reduce crystal nucleus disorder generation, to obtain the lithium carbonate crystal of uniform granularity, solved the problem that product granularity is uneven or unqualified in traditional process.

The invention belongs to the technical field of lithium carbonate preparation, and particularly relates to a preparation method of medicinal lithium carbonate. The preparation method comprises the following steps: adding industrial lithium carbonate slurry into a supergravity rotating bed filled with a functional filler, introducing carbon dioxide gas under stirring to carry out a hydrocarbon reaction, and carrying out solid-liquid separation on the obtained feed liquid to obtain a lithium bicarbonate solution; the functional filler is polyethyleneimine modified filler or ordered mesoporous activated carbon; and under an inert atmosphere, heating the lithium bicarbonate solution for decomposition reaction, carrying out solid-liquid separation on the obtained decomposed feed liquid, and drying the solid to obtain the medicinal lithium carbonate. The functional filler is adopted, the mass transfer performance of the functional filler can be improved, the reaction efficiency is improved, the hydrocarbon reaction conversion rate is high (can reach 99.3%), the prepared medicinal lithium carbonate is high in purity and yield, the particle size meets the medicinal requirement, and further crushing is not needed.

This invention discloses a liquid-phase method for preparing ultrafine lithium tetraborate powder. First, a lithium bicarbonate solution is prepared using high-purity lithium carbonate. Then, the lithium bicarbonate solution is reacted with an ethanol solution of boric acid. By controlling the amount of boric acid added, the method of addition, and the reaction temperature, wet lithium tetraborate is obtained. The wet lithium tetraborate is then dried twice at different temperatures to obtain a density as high as 1.39 g / cm³. 3 The method of this invention produces ultrafine lithium tetraborate powder; moreover, the lithium tetraborate powder obtained by this invention has a purity of ≥99.99%, making it suitable for fields such as microelectronics, digital technology, optoelectronics, new computers, video transmission, military technology, aerospace, satellite communications, and defense technology. The method of this invention has low energy consumption, simple and easy-to-operate procedures, low cost, and is suitable for large-scale production.

The application discloses a purification method of lithium carbonate, which comprises the following steps: mixing industrial-grade lithium carbonate with water according to a certain proportion and stirring to carry out beating; under the stirring condition, carbon dioxide is introduced into the solution after beating to carry out a reaction, so that a lithium bicarbonate solution is obtained; after the reaction is completed, barium hydroxide is added dropwise into the lithium bicarbonate solution, and then filtration is carried out; a small amount of hydrofluoric acid is added dropwise into the obtained filtrate, and then filtration is carried out; the obtained lithium bicarbonate filtrate is subjected to a cation exchange column, so that a relatively pure lithium bicarbonate solution is obtained; the obtained lithium bicarbonate filtrate is subjected to pyrolysis crystallization, lithium carbonate crystals are obtained after filtration; the obtained lithium carbonate crystals are stirred with a certain amount of ultrapure water, and then filtration and washing are carried out, so that high-purity lithium carbonate is obtained. The application can obtain high-purity lithium carbonate with a purity of greater than or equal to 99.99%, the amount of hydrofluoric acid added in the process is smaller, the purpose of impurity removal can be achieved, and the influence on the product yield is reduced as much as possible.

This invention belongs to the field of lithium fluoride preparation technology, specifically a method for preparing high-purity, high-flowability, weakly basic lithium fluoride coated with trace amounts of hydrofluoric acid. This invention utilizes pretreatment technology to precisely control the surface energy of seed crystals, achieving efficient activation and uniform dispersion of the seeds, inducing orderly crystal nucleation. Simultaneously, hydrofluoric acid and lithium bicarbonate are added during the reaction to maintain a weakly acidic environment, promoting stable crystal nucleation and growth. The lithium fluoride product prepared by this invention exhibits weak alkalinity, shows minimal corrosion to stainless steel lithium fluoride drying and cooling equipment, has good flowability, an angle of repose <35°, does not encapsulate carbonate ions, and has a purity ≥99.99%.

Disclosed is a two step process for preparing lithium fluoride, wherein in a first step lithium carbonate is converted to lithium bicarbonate using gaseous carbon dioxide and in a second step the lithium bicarbonate is converted to lithium fluoride using hydrogen fluoride, wherein the first step is carried out in a Buss loop reactor The first step may be in batch or continuous mode; the second step is done in continuous mode. Improvements in the Buss loop reactor for performing the process are also disclosed.

The utility model discloses a lithium bicarbonate solution low-temperature evaporation pyrolysis system, which belongs to the technical field of lithium carbonate preparation, and comprises a feeding unit, an evaporation crystallization unit, a centrifugal separation unit and a steam treatment unit, and the evaporation crystallization unit is respectively connected with the feeding unit, the centrifugal separation unit and the steam treatment unit; the evaporative crystallization unit comprises a crystallizer, an evaporation chamber communicated with the crystallizer and a forced circulation pump; the steam treatment unit comprises a condenser and a vacuum system. The lithium bicarbonate solution is pyrolyzed by adopting negative-pressure low-temperature pyrolysis, so that the pyrolysis temperature is reduced, on one hand, the energy consumption in the pyrolysis process can be reduced, and the use amount of circulating water in the cooling process is reduced; on the other hand, the pyrolysis temperature is reduced, the solubility of lithium carbonate is increased, and scaling in a pyrolysis system can be reduced.

Provided is a method for preparing lithium carbonate, comprising a step of heating a lithium bicarbonate solution to precipitate lithium carbonate, wherein a lithium carbonate seed is added to the lithium bicarbonate solution, and then is heated. The method for preparing lithium carbonate can increase the yield of lithium carbonate by suppressing scale generation in a reactor.

This invention discloses a composite extractant composition and method for extracting lithium from lithium precipitation mother liquor. The composition includes a β-diketone extractant, an N1923 co-extractant, a modifier, and a diluent. The β-diketone extractant is one or more of dodecylphenyl-methyl-β-diketone and 1-phenyl-3-isoheptyl-1,3-propanedione. The modifier is one or more of isodecanol and isooctanol. The diluent is one or more of sulfonated kerosene, No. 260 solvent oil, white oil, n-heptane, and cyclohexane. The composition provided in this application uses N1923 as a co-extractant, which maintains good solubility and chemical stability under strongly alkaline conditions. This invention also provides a method for lithium extraction, which uses this composition to extract alkaline lithium precipitation mother liquor and uses CO2 gas for mild back-extraction to achieve efficient conversion of lithium bicarbonate and recovery of lithium. The back-extraction solution is close to neutral.

The utility model relates to the technical field of lithium carbonate dissolving, in particular to a lithium carbonate dissolving system which comprises a lithium carbonate mixed liquid supply device, a gas supply device and a micro-nano bubble generator, the liquid inlet end and the gas inlet end of the micro-nano bubble generator are connected with the liquid supply end of the lithium carbonate mixed liquid supply device and the gas supply end of the gas supply device respectively, and the micro-nano bubble generator is used for enabling mixed liquid and gas entering the micro-nano bubble generator to form a micro-nano bubble solution in the working state of the micro-nano bubble generator; a carbon dioxide supply device for supplying carbon dioxide; a bubble liquid inlet end and a carbon dioxide inlet end of the reaction tank are respectively connected with a liquid outlet end of the micro-nano bubble generator and a gas supply end of the carbon dioxide supply device, so that lithium carbonate in the micro-nano bubble solution entering the reaction tank is subjected to carbonization reaction under the action of carbon dioxide to generate lithium bicarbonate; and dissolving in a micro-nano bubble solution. By applying the lithium carbonate dissolving system, the dissolving efficiency of lithium carbonate can be effectively improved.