140 results about "Manganous-manganic oxide" patented technology

The invention belongs to the technical field of lithium batteries, and particularly relates to a lithium manganate positive electrode material, a preparation method thereof and a lithium battery, and the method comprises the following steps: adding a manganese sulfate solution, a precipitator and a complexing agent into a reaction kettle in a parallel flow manner, reacting under a first preset reaction condition, and introducing a first oxidant while reacting to obtain a mixed solution; concentrating the mixed solution to preset solid content, and adding a curing agent for curing reaction to obtain manganous-manganic oxide slurry; adding a manganese sulfate solution, a precipitant and a complexing agent into the reaction kettle in a parallel flow manner again, reacting with the manganous-manganic oxide slurry under a second preset reaction condition, introducing a second oxidizing agent while reacting to obtain a composite manganese oxide mixed solution, and filtering, washing and drying to obtain a composite manganese oxide; the composite manganese oxide and lithium carbonate are mixed, calcined, crushed and graded to obtain the lithium manganate positive electrode material, so that the electrochemical performance of the lithium manganate positive electrode material is improved.

The invention provides a lithium manganate precursor with a crystal face induction effect, a preparation method of the lithium manganate precursor, a positive electrode material and a lithium battery, and belongs to the technical field of energy materials, the lithium manganate precursor can play a crystal face induction role in the subsequent lithium mixing sintering process, the lithium manganate precursor is spherical-particle manganous-manganic oxide, the particle size D50 is 3-15 microns, and the particle size D50 is 3-15 microns. The primary particles are uniform in size. The core advantage of the method is that synchronous and uniform doping of the element M and the element M'is realized at the precursor stage through a coprecipitation method. The co-precipitation doping technology not only ensures the atomic-scale uniform distribution of doping elements in manganous-manganic oxide, but also effectively stabilizes the crystal structure of the lithium manganate positive electrode material by utilizing the synergistic effect of the elements in the subsequent sintering process, and realizes the selective induced growth of the crystal face. The unique crystal face induction effect has significant contribution to improvement of the electrochemical performance, including cycling stability, rate capability and safety, of the positive electrode material.

The invention provides an in-situ synthesis method and application of aluminum-doped battery grade manganous-manganic oxide and lithium manganate. An aluminum-doped manganous-manganic oxide precursor is synthesized in one step through a direct homogeneous oxidation method, and then the lithium manganate positive electrode material is prepared through a high-temperature solid-phase reaction. The technological parameters such as the volume of a base solution, the concentration of a manganese-containing solution, the concentration of ammonia water, the flow of a salt solution, the stirring speed and the reaction temperature are regulated and controlled, and the synthesized manganous-manganic oxide precursor is uniform in particle size and has relatively high tap density and relatively low specific surface area. The capacity retention ratio of the obtained aluminum-doped lithium manganate reaches 85.16% after the aluminum-doped lithium manganate is circulated for 100 circles at the rate of 0.2 C, and the discharge specific capacity of the aluminum-doped lithium manganate is 105.8 mAh / g at the high rate of 5C. According to the method, the efficient recycling of waste battery resources is realized, the production cost is reduced, and meanwhile, the problem of non-uniformity of a conventional doping process is solved.

The invention relates to the technical field of preparation of manganous-manganic oxide, in particular to a production and preparation process of a manganous-manganic oxide material for batteries, which comprises the following steps: dissolving high-purity manganese sulfate to prepare a manganese sulfate solution, and adding a dispersing agent and a surfactant to obtain a manganese salt solution; the method comprises the following steps: adding a base solution into a reaction kettle, stirring and heating, conveying a manganese salt solution and ammonia water, synchronously introducing oxygen, dividing the whole oxidation reaction process into two stages, controlling the flow velocity of the ammonia water in different stages, and dynamically adjusting the temperature; and carrying out suspension precipitation on manganous-manganic oxide obtained by the oxidation reaction, aging, and carrying out dehydration suction filtration, washing and drying to obtain the manganous-manganic oxide material for the battery. The invention aims to adjust the morphology of the manganous-manganic oxide finished product by controlling reaction conditions, effectively reduce the granularity of the product and enhance the uniformity of particle size distribution.

The invention discloses an iron-doped manganous-manganic oxide material and a preparation method and application thereof.According to the iron-doped manganous-manganic oxide material and the preparation method and application thereof, manganese sulfate serves as a manganese source, DTPA ferric ammonium salt serves as a complexing agent and a doping agent, ammonia water serves as alkali liquor, ethyl alcohol serves as a dispersing agent, and the preparation process is optimized in a targeted mode; the iron-doped manganous-manganic oxide material with uniform particle size distribution is prepared, the doping uniformity of the iron element in large-size micron-sized manganous-manganic oxide particles is improved while the sulfur content in the material is reduced, and the product is good in particle size uniformity and high in tap density. In addition, the process provided by the invention also has the characteristics of simple flow, easiness in operation, low input cost, high economic benefit and large-scale popularization and application.

The invention provides a preparation method and application of modified'sea urchin type 'manganous-manganic oxide, ammonia water is used as a main precipitator, manganese sulfate, the precipitator and a complexing agent are added into an alkaline base solution, filtering, washing and drying are performed after reaction to obtain'sea urchin type' manganous-manganic oxide, and the modified'sea urchin type 'manganous-manganic oxide is obtained by modifying the surfaces of particles on the basis. Al, Mg, Ti, Zn and other elements are introduced through liquid phase doping, a wrapping layer is formed on the surface of the sea urchin type manganous-manganic oxide, and the electrochemical performance and stability of the lithium manganate material can be further improved. The invention provides modified sea urchin-type manganous-manganic oxide with primary crystal grains larger than 300 nm, and the manganous-manganic oxide can effectively reduce the erosion effect of electrolyte by means of high-crystallinity and large-size conical crystal grains.

The invention relates to the technical field of high-performance composite materials, and provides a frequency band magnetic control adjustable one-dimensional nanotube composite wave-absorbing material and a preparation method thereof.The material is composed of a one-dimensional tubular ferroferric oxide matrix and manganous-manganic oxide wrapping the outer side of the matrix, and directional arrangement is conducted through magnetic control rotation. The preparation method comprises the following steps: preparing an iron oxyhydroxide precursor through a hydrothermal synthesis method; the preparation method comprises the following steps: reducing an iron oxyhydroxide precursor by a liquid-phase pyrolysis method, and coating a manganous-manganic oxide shell layer in situ at the same time, so as to obtain a nanotube ferroferric oxide / manganous-manganic oxide composite material; and carrying out orientation arrangement on the nanotube-shaped ferroferric oxide / manganous-manganic oxide composite material through magnetic field control. According to the preparation method and the structural design, the yield, the uniformity, the magnetic performance, the electromagnetic wave absorption efficiency, the multi-band electromagnetic loss enhancement and the like of the material are remarkably improved.

The invention provides ferromanganese phosphate and a preparation method thereof, and relates to the technical field of new energy. According to the preparation method of the ferromanganese phosphate, a first raw material containing amorphous ferric phosphate, a second raw material containing manganous-manganic oxide, a first oxidizing agent and a phosphoric acid solution react to generate homogeneous ferromanganese phosphate, and the characteristic that the manganous-manganic oxide in the second raw material is similar to the amorphous ferric phosphate in the first raw material in solubility and reaction speed is utilized; homogeneous co-precipitation of Mn and Fe is realized, and ferromanganese phosphate with uniformly distributed elements is generated. In addition, according to the preparation method of the ferromanganese phosphate, monodisperse growth of crystals can be achieved without an organic matter dispersing agent.

The invention relates to the field of preparation of battery materials and precursors of the battery materials, and discloses a method for efficiently preparing battery-grade manganous-manganic oxide by using electrolytic manganese residue leachate and a harmless treatment method for tail liquid of the battery-grade manganous-manganic oxide. Treating the manganese residue leachate concentrated water obtained in the previous step with ammonia water and oxygen to prepare battery-grade manganous-manganic oxide; adjusting the pH value of the filtrate obtained in the previous step to prepare magnesium hydroxide; the filtrate obtained in the previous step is subjected to evaporative crystallization, ammonium sulfate is prepared, finally, harmless treatment of preparation of battery-grade manganous-manganic oxide from the manganese residue leachate and the tail liquid of the battery-grade manganous-manganic oxide is achieved, and the recovery efficiency of valuable components is greatly improved.

The utility model discloses a battery-grade manganous-manganic oxide preparation system which comprises a reaction kettle as well as a first storage tank, a second storage tank and a third storage tank which are connected with a feeding hole of the reaction kettle, the first storage tank is used for storing a slow-release agent, and a first feeding pump is arranged on a conveying pipe, connected with the reaction kettle, of the first storage tank; the second storage tank is used for storing a manganese sulfate solution; a second feeding pump is arranged on a conveying pipe for connecting the second storage tank and the reaction kettle; the third storage tank is used for storing alkali liquor, and a first feeding pump is arranged on a conveying pipe, connected with the reaction kettle, of the third storage tank; the reaction kettle is also connected with an oxidizing agent conveying pipe; a control valve is arranged on the oxidizing agent conveying pipe; a sampling port is formed in the reaction kettle and is connected with the particle size analyzer and the pH monitor respectively; a discharge hole is formed in the bottom of the reaction kettle. According to the utility model, the battery-grade manganous-manganic oxide product with higher purity and better performance can be obtained while the particle size is controlled.

The invention belongs to the technical field of manganous-manganic oxide production, and particularly discloses low-specific-surface-area manganous-manganic oxide and a preparation method thereof.In the process of preparing manganous-manganic oxide through one-step oxidation, the oxygen introduction rate and the stirring linear speed at different reaction stages are accurately adjusted, so that the specific surface area of manganous-manganic oxide is increased, and the specific surface area of manganous-manganic oxide is increased. Furthermore, accurate cooperative control on crystal nucleation and growth processes is realized, so that a manganous-manganic oxide product with a low specific surface area can be stably obtained, and the requirement of a high-performance battery material on the low specific surface area is met. The method can be suitable for reaction equipment of different scales, and is beneficial for realizing large-scale production of products. In addition, the method is short in process, easy to operate, high in production efficiency and stable and controllable in product quality. And the obtained product is low in specific surface area, moderate in particle size, uniform in morphology and relatively high in tap density. The lithium manganate material adopting the product shows excellent cycle performance, the service life of the battery is remarkably prolonged, and the energy density of the battery is remarkably improved.

The invention discloses a method for preparing sphere-like battery grade manganous-manganic oxide, manganous-manganic oxide is directly obtained through a one-step method, and meanwhile, on-line changes of parameters of manganous-manganic oxide crystals in different growth stages are specifically controlled and changed according to growth characteristics of manganous-manganic oxide crystal particles. And the growth process of the manganous-manganic oxide crystal is regulated and controlled, so that the particle size of the product is controlled, the shape of the product is optimized, and finally the manganous-manganic oxide product with uniform and controllable particle size and good morphological characteristics is obtained. Besides, according to the invention, a corresponding scheme can be formulated according to the particle size of a target product to obtain a product meeting the requirement, and the fine control of the Mn3O4 preparation process is realized. The method has the advantages of short process, simplicity in operation, low energy consumption and the like.

The invention relates to a preparation method of manganous-manganic oxide / graphite nano-enzyme for sensitive detection of L-cysteine, a green synthesis strategy is adopted, a mechanochemical method is combined to develop a novel Mn3O4 / graphite composite material which is low in cost, high in activity and easy to synthesize in macroscopic quantity, and the prepared product has relatively high catalytic activity and can be applied to the detection of L-cysteine. Compared with the prior art, the method has the advantages that oxidase-like activity is obviously improved, the Michaelis constant Km is 0.132, the maximum reaction rate Vmax is 0.998 * 10 <-7 > M <-1 > s, high-sensitivity and visual analysis and detection of L-Cys can be realized at normal temperature, the detection interval is 1-40 [mu] mol / L, and the detection limit is 0.361 [mu] mol / L.

The invention discloses a low-sulfur high-purity manganese tetraoxide and its preparation method and application, and relates to the technical field of positive electrode materials. The method comprises: mixing a high-sulfur manganese tetraoxide raw material with a sulfur content of ≥100ppm with a strong oxidant; oxidizing and heat-keeping the mixture at 350-600℃ air atmosphere for 3-8h to obtain a low-sulfur manganese oxide; treating at 250-550℃ for 2-4h under reducing gas conditions to obtain a low-sulfur high-purity manganese tetraoxide with a doped phase purity of 100% and a sulfur content of ≤50ppm. The present invention can achieve complete decomposition of sulfur residues during oxidation by oxidizing and then reducing the high-sulfur manganese tetraoxide raw material, thereby improving the treatment efficiency of sulfur residues. During the reduction process, other oxides of manganese are converted into Mn3O4, which is conducive to preventing the generated Mn3O4 from further reacting, and keeping the crystal form unchanged, and the obtained product has high purity, high tap density and good activity.

The invention discloses a low-crystallinity rutile phase ruthenium manganese oxide catalyst as well as a preparation method and application thereof, and belongs to the technical field of electro-catalysis. The low-crystallinity rutile phase ruthenium manganese oxide catalyst is of a nano-particle structure, the structure of the low-crystallinity rutile phase structure, and the preparation method of the low-crystallinity rutile phase ruthenium manganese oxide catalyst comprises the following steps: mixing prepared or commercially available manganous-manganic oxide powder with a ruthenium precursor solution, and fully reacting the manganous-manganic oxide powder and the ruthenium precursor solution through stirring or ultrasonic treatment; filtering, washing and drying to obtain precursor powder; and calcining the precursor powder, and cooling to room temperature to obtain the low-crystallinity rutile phase ruthenium manganese oxide catalyst. The method provided by the invention is simple to operate, mild in condition and low in production cost, and the low-crystallinity rutile phase ruthenium manganese oxide catalyst has outstanding activity and stability in the aspect of electro-catalysis water oxidation and has a good application prospect in the field of hydrogen production by proton exchange membrane water electrolysis.

The invention relates to a cationized manganese nano adjuvant as well as a preparation method and application thereof. The cationized manganese nano adjuvant comprises manganous-manganic oxide nano particles and cationized template molecules wrapping the surfaces of the manganous-manganic oxide nano particles, the cationization template molecule is a protein subjected to cationization modification treatment, or a protein fragment thereof, or a polypeptide fragment thereof. Precise regulation and control of surface charges and structures of the manganese nanoparticles are realized through a biomineralization technology, and the key problems of a traditional vaccine adjuvant in the aspects of antigen delivery, immune activation and biocompatibility are effectively solved. The cationized manganese nano adjuvant can efficiently adsorb various antigens to form a stable nano vaccine compound, and congenital immunity and adaptive immunity response of an organism can be remarkably activated; lymph nodes can be effectively targeted, the enrichment degree of antigens in the lymph nodes is improved, and the immune effect is further enhanced; meanwhile, the biotoxicity is low, and the stability is excellent.

The invention discloses a preparation method of a low-cost lithium manganate material, and belongs to the technical field of new energy lithium battery materials. The method comprises the following steps: (1) pretreatment: putting manganous-manganic oxide, lithium carbonate and doped metal elements into equipment, and fully mixing to obtain a mixture; and (2) sintering: calcining the mixture in a rotary furnace. And (3) post-treatment: crushing the cooled material, sieving, and removing iron to obtain the lithium manganate. According to the invention, low-cost manganous-manganic oxide is used as a synthesis raw material, a rotary furnace is used as a sintering carrier, and a dynamic synthesis mode is adopted, so that the sufficient reaction of the materials is facilitated, the yield is not limited, the sintering time and the sintering temperature are greatly reduced, the energy consumption is reduced in a disguised manner, the yield is improved, and meanwhile, the consistency of the product is improved.

The application discloses a kind of potassium-doped chain-like trimanganese tetroxide positive electrode materials and its preparation method and application, belong to the field of aqueous zinc-ion battery, preparation method includes: configuration isopropanol and deionized water mixed solution with a portion of.In magnetic stirring, manganese acetate, potassium chloride and nitrilotriacetic acid are dissolved into mixed solution, K-Mn-NTA, i.e.K-Mn-NCs precursor is prepared by hydrothermal method;Afterwards, K-Mn3O4-NCs is prepared by annealing method;Finally, polyaniline is in-situ polymerized on K-Mn3O4-NCs to obtain K-Mn3O4-NCs@PANI;The positive electrode material of the application is applied to zinc-ion battery, can improve the cycle performance and rate capability of zinc-ion battery, improve the conductivity of positive electrode material while inhibiting the dissolution of Mn, improve the electrochemical performance of zinc-ion battery.

The method comprises the following steps: (1) adding a manganese source, a catalyst and an additive, and introducing oxygen-containing gas to carry out a reaction, so as to obtain mixed slurry; (2) carrying out solid-liquid separation to obtain a mother solution and a solid product, and carrying out post-treatment on the solid product to obtain battery-grade manganous-manganic oxide; and (3) adjusting the pH value of the mother liquor to 7-11, carrying out solid-liquid separation to obtain and treat a manganous-manganic oxide product, and recycling the mother liquor as a base solution or process water in the step (1). The method adopts a basic pH regulation-precipitation method to recover manganese and purify the mother liquor, greatly reduces equipment investment and daily operation and maintenance cost, does not need to depend on other processes for absorption, is short in process flow, clear and easy to control control parameters, is easy to implement and popularize on an existing production line, realizes closed-loop circulation of water, and is suitable for industrial production. New water consumption and wastewater discharge are greatly reduced, the green production requirement is met, and the produced product has good morphology and tap density.

The invention belongs to the technical field of battery material preparation, discloses a preparation method of manganous-manganic oxide with controllable tap density, and aims to solve the problem that a manganous-manganic oxide preparation process in the prior art is difficult to effectively control the tap density of a product, and provides a preparation method of manganous-manganic oxide with controllable tap density based on deep research on growth characteristics of manganous-manganic oxide crystal particles. By optimizing process parameters and regulating and controlling behaviors of the particles in different growth stages, accurate prediction and accurate control of the tap density of the product are successfully realized. On the basis, the process conditions are further optimized, the controllability of the tap density of the product is ensured, the high-tap-density manganous-manganic oxide material is successfully prepared, and important guidance and practical reference are provided for controllable synthesis of battery-grade manganous-manganic oxide. In addition, according to the technology, the preparation process is simplified, the operation difficulty and energy consumption are reduced, and the obvious industrial application potential and industrialization value are achieved.

The application discloses a method for preparing spherical battery-grade Mn3O4, and the Mn3O4 is directly obtained through a one-step method. According to the growth characteristics of the Mn3O4 crystal particles, the on-line changes of the parameters of different growth stages of the Mn3O4 crystal are controlled and changed, and then the growth process of the Mn3O4 crystal is regulated, so that the particle size of the product is controlled and the shape of the product is optimized. Finally, the Mn3O4 product with uniform and controllable particle size and good morphology characteristics is obtained. In addition, according to the particle size of the target product, a corresponding scheme can be formulated to obtain the product meeting the requirements, and the fine control of the preparation process of the Mn3O4 is realized. The method has the advantages of short process, simple operation and low energy consumption.

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly relates to an iron-magnesium-doped spherical precursor manganous-manganic oxide and a preparation method thereof, the chemical formula of the iron-magnesium-doped spherical precursor manganous-manganic oxide is MnFexMgyO (8 / 3 + 3x + 2y) / 2, x is more than or equal to 0.001 and less than or equal to 0.005, and y is more than or equal to 0.0015 and less than or equal to 0.0065. The iron and magnesium doped spherical precursor manganous-manganic oxide is in a granular shape; the invention also discloses a preparation method of the ferrum and magnesium doped spherical precursor manganous-manganic oxide. The material has the advantages of high tap density, small specific surface area, low impurity content, high energy density, good cycle performance, good safety performance and excellent rate capability after being sintered into lithium manganate.

The invention discloses a preparation method and application of a graphene composite lubricant, graphite, a strong oxidizing acid and a strong oxidant are mixed for oxidation reaction, after the reaction is completed, a reducing agent is added to terminate the oxidation reaction, the pH value of the solution is adjusted to be alkaline, then a metal oxide catalyst is added, oxygen-containing gas is blown in at the same time, and a composite material is obtained after the reaction. And cleaning the obtained composite material, and drying at high temperature to obtain the solid powder composite lubricant. The metal oxide catalyst is introduced in the preparation process, so that the reaction efficiency is improved, and the manganous-manganic oxide / graphene composite material with a more stable structure is formed.

The application discloses a preparation method of a lithium iron manganese phosphate positive electrode material, which comprises the following steps: mixing pre-lithiated lithium iron manganese phosphate precursors, lithium carbonate, iron phosphate, trimanganese tetraoxide and phosphoric acid according to a stoichiometric ratio, preparing a slurry, pretreating the slurry under pH 9-10, mixing the slurry with a polyethylene glycol carbon source after sand milling, and sintering the mixture under an inert atmosphere at 720 DEG C for 6-12 hours after spray drying to obtain a carbon-coated lithium iron manganese phosphate positive electrode material with a particle size D50 of 100-200 nm. The method is simple in process, the obtained material is uniform in particle size, excellent in electrochemical performance, and suitable for high-performance lithium ion batteries.

The application discloses a preparation method and application of nanometer manganese iron lithium phosphate, and comprises the following steps: mixing pre-lithiated manganese iron lithium phosphate precursor, lithium carbonate, iron phosphate, trimanganese tetroxide and ammonium phosphate into slurry according to the stoichiometric ratio of LiMn0.7Fe0.3PO4, and pretreating in an alkaline environment with pH being 8.5-9.5; wet ball milling treatment; mixing with modified glucose and then spray drying; sintering at 700-750 DEG C for 8-14 hours in an inert atmosphere to obtain carbon-coated nanometer manganese iron lithium phosphate. The pre-lithiated precursor is prepared through a hydrothermal reaction, and the modified glucose is carboxylated through citric acid. The method realizes uniform carbon coating of nanoscale particles, suppresses manganese dissolution and interface side reactions, improves lithium ion diffusion and electronic conductivity, improves specific capacity, rate performance and cycle stability, and is suitable for anode materials of lithium ion batteries.

The invention relates to the technical field of preparation of manganous-manganic oxide, in particular to a method for preparing manganous-manganic oxide by taking recycled manganese liquid as a raw material, which comprises the following steps: in a reaction kettle, taking the recycled manganese liquid as the raw material, and adopting a manganese salt primary oxidation method to prepare the manganous-manganic oxide, evaluating the possibility of particle agglomeration caused by non-uniform mixing of solutes in the reaction solution; measuring the significance of the particle aggregation phenomenon; adjusting the stirring speed of the reaction solution in the reaction kettle in real time; and after the reaction is finished, obtaining a manganous-manganic oxide suspended precipitate, and then washing, drying and packaging to obtain a manganous-manganic oxide product. The invention aims to accurately measure the significant degree of particle agglomeration when solutes are not uniformly mixed so as to control and adjust the stirring speed in the process of preparing manganous-manganic oxide and improve the preparation quality of a manganous-manganic oxide product.

The invention discloses a method for removing trimethylamine through catalysis of a manganous-manganic oxide catalyst, and belongs to the technical field of atmospheric pollution control in environmental chemical engineering. The preparation method comprises the following steps: dissolving manganese acetate tetrahydrate in a mixed solution of ethylene glycol and water, heating, then adding a Na2CO3 solution in a nitrogen atmosphere, stirring for reaction, and then washing, drying and calcining to obtain a spherical manganous-manganic oxide catalyst; and finally, in a nitrogen atmosphere containing trimethylamine and oxygen, realizing catalytic removal of the trimethylamine by the spherical manganous-manganic oxide catalyst at 50-250 DEG C. By controlling the morphology of the manganous-manganic oxide catalyst, the obtained spherical manganous-manganic oxide catalyst can completely catalyze and decompose trimethylamine at a relatively low temperature (175 DEG C), and the spherical manganous-manganic oxide catalyst does not have an obvious inactivation phenomenon when the degradation reaction of the spherical manganous-manganic oxide catalyst on the trimethylamine is performed for 45 hours. When the trimethylamine is catalytically removed by the manganous-manganic oxide catalyst, the spherical manganous-manganic oxide catalyst has excellent nitrogen and carbon dioxide selectivity.

The invention discloses a manganese-based composite negative electrode material, a negative electrode plate, preparation methods of the manganese-based composite negative electrode material and the negative electrode plate, and a lithium ion battery. The manganese-based composite negative electrode material is a composite material of manganous-manganic oxide and reduced graphene oxide. In the negative electrode material provided by the invention, the graphene matrix provides a conductive three-dimensional network structure for Mn3O4, the Mn3O4 nano octahedron prevents the graphene layer from being stacked again, and in addition, the Mn3O4 nano structure wrapped by graphene can reduce volume expansion in the charging and discharging process, so that the cycle life is prolonged.

The invention relates to the technical field of manganese sulfate for manganous-manganic oxide materials, in particular to a low-cost impurity removal method for a by-product manganese salt, which comprises the following steps: by taking the by-product manganese salt as a manganese source, sequentially adding a coagulation agent, an impurity removal agent and an extraction agent to obtain a manganese sulfate solution, re-preparing the impurity removal agent and the extraction agent from the by-product through a stripping agent, and returning the impurity removal agent and the extraction agent to a process system for cyclic utilization. The by-product manganese salt is used as a manganese source, the raw material price is low, wastewater and waste residues generated in the production period can be returned to the technological process for reuse, the cost is saved, the environmental pollution is small, the obtained product manganese sulfate solution can reach the battery-grade manganese sulfate standard, and the fluorine content of the solution is greatly reduced and is obviously superior to that of an existing process.

The application belongs to the technical field of battery materials, and specifically discloses a preparation method of battery-grade trimanganese tetraoxide. The application first mixes a complexing agent, a pH regulator and an ethanol aqueous solution to obtain a mixed solution; then the mixed solution is mixed with a manganese source to perform a complexing dissolution reaction; after the reaction is completed, oxygen is introduced into the mixed solution to sequentially perform an oxidation reaction, an induced hydrolysis assembly and aging, so as to obtain the battery-grade trimanganese tetraoxide; the complexing agent comprises one or more of glycine, sodium glutamate, ammonium acetate, triammonium citrate and aminotri (methylene) phosphonic acid. The preparation method provided by the application has the advantages of few steps, short path and low energy consumption; and the trimanganese tetraoxide obtained finally has the advantages of stable properties, high quality, high sphericity and high manganese content.