48 results about "Aluminum Complex" patented technology

The invention belongs to the technical field of lithium ion battery recovery, and particularly relates to an impurity removal method of waste lithium iron phosphate and battery-grade ferric phosphate, waste lithium iron phosphate black powder is added into high-concentration acid for acid leaching, and leaching of iron, phosphorus and lithium elements is achieved; adding an impurity removal agent 1 into the obtained filtrate to remove impurity copper; then adding a composite impurity removing agent 2 to form an aluminum-containing complex precipitate, removing impurity aluminum, and meanwhile, removing impurity titanium due to hydrolysis in the process; and adding an oxidizing agent and a precipitating agent into the obtained purified liquid for synthesis. And supplementing phosphoric acid into the obtained amorphous iron phosphate, carrying out crystallization reaction at high temperature, and finally, carrying out flash evaporation and calcination to obtain the anhydrous battery-grade iron phosphate. The method is high in impurity removal efficiency, the regenerated iron phosphate can reach battery-grade iron phosphate, and the method is a feasible method for regenerating the battery-grade iron phosphate by using the waste lithium iron phosphate black powder.

The present disclosure provides a resin composition that can improve the fluidity of the resin composition and enhance the crack resistance of a cured product. The resin composition contains a liquid epoxy compound (A), a liquid aromatic amine compound (B), an inorganic filler (C), and an aluminum complex (d1) having nitrogen atoms and oxygen atoms. The viscosity of the resin composition at 25°C is 400 Pa·s or less.

The invention discloses a titanium-aluminum composite electronic equipment shell and a manufacturing method thereof. The manufacturing method comprises the following steps: manufacturing a titanium alloy frame; manufacturing an aluminum alloy middle plate; the titanium alloy frame and the aluminum alloy middle plate are welded and fixed by adopting a pulse laser welding process to form a titanium / aluminum complex; an in-mold injection molding layer is formed on the titanium / aluminum composite through injection molding; and the electronic equipment shell is formed through CNC machining. According to the electronic equipment shell, functional partition of the inner cavity aluminum alloy and the outer titanium alloy is adopted, compared with a full titanium alloy scheme, the weight and cost of the electronic equipment shell can be reduced, and attenuation of 5G signals can be reduced; the titanium alloy frame and the aluminum alloy middle plate are welded and fixed through the pulse laser welding technology, the connection strength can be improved, and the problem that welding connection of dissimilar metal made of titanium / aluminum materials is not firm is solved. By adopting the mode of injection molding first and then CNC machining on the whole, it can be ensured that all functional characteristics are accurately machined and formed while the in-mold injection molding layer and the metal base body are tightly combined, and mass production is facilitated.

The invention relates to the technical field of concrete admixtures, and particularly discloses a waterproof dense setting accelerator and a preparation method and application thereof, the waterproof dense setting accelerator comprises the following components by weight: 5-10 parts of a suspending agent, 50-250 parts of modified silica sol, 100-250 parts of an organic complex waterproof agent, 400-600 parts of a setting accelerator, and water; wherein the modified silica sol is obtained by modifying acidic silica sol with a modifier, and the modifier is a silane coupling agent; wherein the organic complexing waterproofing agent is a higher fatty acid aluminum complex. After the waterproof dense setting accelerator is doped into concrete, a large amount of air entraining of the concrete cannot be caused, microcracks of sprayed concrete can be filled, the compactness of the concrete is further improved, meanwhile, a hydrophobic effect is formed in the sprayed concrete and on the surface of the sprayed concrete, and the addition of the organic complexing waterproof agent can promote the condensation of the concrete, so that the waterproof performance of the concrete is improved. And the concrete can be quickly coagulated by matching with a coagulant.

The invention provides a lithium-promoted ruthenium-based ammonia decomposition catalyst and a preparation method thereof, and belongs to the technical field of thermocatalysis. The preparation method comprises the following steps: mixing LiNO3 and Al (NO3) 3.9 H2O to obtain a first mixed solution, dropwise adding the first mixed solution and a NaOH solution into a Na2CO3 solution to generate a precipitate, keeping the pH value of the precipitate stable to obtain a lithium-aluminum composite hydroxide precursor, and roasting the precursor to obtain a lithium-aluminum composite oxide; and dispersing the lithium-aluminum composite oxide in ethanol, dropwise adding a ruthenium precursor solution to obtain a second mixed solution, carrying out vacuum evaporation treatment on the second mixed solution, and finally carrying out reduction treatment to obtain the lithium-promoted ruthenium-based ammonia decomposition catalyst. The catalyst provided by the invention shows good activity and stability in an ammonia decomposition reaction.

The invention discloses a method for separating fluorine-aluminum complexes in tea trees, and belongs to the technical field of separation and purification. The preparation method comprises the following steps: grinding fresh leaves, stems and roots of tea trees, and performing centrifugal separation to obtain juice; and injecting the juice into an anion exchange column for separation to obtain the form and proportion of an anionic fluorine-aluminum complex and a cationic fluorine-aluminum complex. The method is simple, high in operability and suitable for large-scale industrial use.

Provided is a resin composition which contributes to the low dielectric loss tangent of a cured product, in particular, a resin composition which contributes to the achievement of a cured product exhibiting a lower dielectric loss tangent even in a high-temperature (100 DEG C) environment. The resin composition contains (A) a cyclic ether compound having a four-membered ring or less, (B) a curing agent, (C) an inorganic filler, and (1D) an aluminum complex, and the component (A) contains (A1) a cyclic ether compound having a cationically polymerizable four-membered ring or less.

The present disclosure relates to a composition comprising: (a) a cationic polymerization initiator; and (b) an indene based or cyclopentadiene based resin; wherein the cationic polymerization initiator is selected from the group consisting of (i) an aromatic sulfonium salt-based cationic polymerization initiator; (ii) a phosphonium salt-based cationic polymerization initiator; (iii) a quaternary ammonium salt-based cationic polymerization initiator; (iv) an aluminum complex-based cationic polymerization initiator; (v) an aromatic iodonium salt-based cationic polymerization initiator; (vi) an aromatic diazonium salt-based cationic polymerization initiator; (vii) a pyridinium-based cationic polymerization initiator and (viii) a mixture thereof. Also described are varnishes and coatings formed from said composition.

The invention discloses a beta-ketimine type binuclear aluminum complex and a preparation method thereof. The binuclear aluminum complex can be used for catalyzing ring opening polymerization of caprolactone, lactide, glycolide, valerolactone, butyrolactone or ethylene carbonate. The invention further discloses a preparation method and application of the binuclear aluminum complex. The preparation method is simple, the reaction condition is mild, the prepared beta-ketimine type binuclear aluminum complex is used as a catalyst, the catalytic activity is high, the stability is good, the service life is long, the molecular weight distribution of the obtained polymerization product is narrow, and the beta-ketimine type binuclear aluminum complex can be well applied to the ring-opening polymerization reaction of cyclic ester.

Described is a moisture-curable silicone composition comprising at least one crosslinkable polydiorganosiloxane having alkoxysilane end groups, at least one condensation catalyst, at least one crosslinking agent having alkoxysilane groups, and optionally further ingredients; characterised in that the condensation catalyst is the reaction product obtained from the reaction of 1 equivalent of a metal complex with 0.1 to 1 equivalent of a preferably partially esterified phosphoric acid or organic phosphonic acid, where the metal complex MC is a titanium (IV), zirconium (IV) or aluminum (III) complex, preferably a titanium (IV) complex, having at least one alkoxy ligand and at least one organic chelate ligand. The compositions are particularly suitable as low modulus adhesives or sealants and have excellent mechanical properties such as tensile strength and tear propagation resistance as well as excellent storage stability, especially in the form of RTV-1 formulations.

The invention discloses a guanidyl zinc / aluminum complex as well as a preparation method and application thereof, and relates to the technical field of polymerization catalysts. The guanidyl zinc / aluminum complex prepared by the invention has a single catalytic activity center, and accurate control on the structure and molecular weight of a polymer can be realized by regulating and controlling a ligand structure, metal types and polymerization conditions. The catalyst has the remarkable advantages of low toxicity, low cost, simplicity in synthesis, high catalytic activity, stable performance and the like, and is suitable for lactone ring-opening polymerization reaction. Under the protection of inert gas, the polycaprolactone has excellent activity when catalyzing polymerization of lactide, caprolactone and other lactone monomers, the molecular weight of the obtained polycaprolactone is up to 219.2 kg / mol, and an effective way is provided for preparation of high-molecular-weight polyester. In addition, the catalyst can still keep high activity and stability under simulated industrial conditions, and has wide industrial application prospects.

The invention provides an anti-interference coagulant which comprises nano C-A-H seed crystal, lithium-aluminum layered double hydroxide, calcium aluminate powder, zwitterionic slow-release alkali, cyclic borate, hydroxyl carboxylic acid aluminum complex, redispersible latex powder and superfine quartz powder, and through a synergistic mechanism of seed crystal induction, buffer complexation, lithium slow release and carrier dispersion, the anti-interference coagulant is prepared. Under the low doping amount of 0.05-0.3 wt%, rapid condensation and early-stage high strength under the complex conditions of 5-35 DEG C, high humidity, high alkali, high sulfate radical and the like are achieved, and the high-temperature performance of the refractory material is not affected. The invention also provides a preparation method of the coagulant and an application of the coagulant in a calcium aluminate cement combined refractory material.

The present application relates to the technical field of refractory materials, in particular to a preparation method of high anti-permeability phosphate bonded silicon carbide refractory brick. The raw materials of the preparation method include high bauxite clinker, silicon carbide aggregate, zirconia micropowder, graphene, aluminum dihydrogen phosphate solution, magnesium-aluminum complex powder, clay and silicon dioxide micropowder. The preparation steps are as follows: after the silicon carbide aggregate is dried after removing iron by hydrochloric acid, the aggregate is co-milled with the pre-dried high bauxite clinker, zirconia micropowder and graphene to obtain powder A; after the aggregate is wet-milled with part of the aluminum dihydrogen phosphate solution and water, powder A, clay and silicon dioxide micropowder are added for further mixing and milling, and the remaining aluminum dihydrogen phosphate and magnesium-aluminum complex are added to obtain plastic mud; the mud is formed by high-pressure molding, dried in two stages, and fired at gradient temperature in a weak reducing atmosphere. The method significantly improves the anti-permeability of the refractory brick, and realizes the microporization of the pores of the refractory brick and the high anti-permeability effect through the synergistic effect of composite bonding phase, gradient firing and physical barrier.

In one embodiment the application pertains to a process which provides longer chain and less isomerized (more linear molecules). A propylene-derived olefin mixture is reacted under suitable conditions to form a mixture of oligomers in the presence of a catalyst comprising alkyl aluminum halide complex. A suitable alkyl aluminum halide complex comprises ethyl aluminum dichloride bis(2-chloroethyl) ether complex which may be used with a tert-butyl chloride or other initiator.

The invention discloses a controllable preparation method of flaky aluminum oxide. The invention aims to provide a method for preparing flaky α-Al2O3 micron seed crystals at low temperature, and realizes controllable preparation of seed crystal particle size by a hydraulic classification method. The method comprises the following steps: uniformly mixing aluminum salt and urea, grinding the mixture, and drying the mixture to obtain a urea-aluminum complex; uniformly mixing the mixture with a soluble molten salt, and calcining the mixture at 550°C to 1100°C for 2-10 hours to obtain flaky α-Al2O3 seed crystals; screening the flaky α-Al2O3 seed crystals with different particle size ranges by hydraulic classification; uniformly mixing the seed crystals, aluminum salt, soluble molten salt, and a crystal growth regulator solution to obtain a suspension A; adding a soluble phosphate to an alkaline aqueous solution and mixing the mixture to obtain a solution B; adding the solution B to the suspension A, mixing the mixture, and drying the mixture to obtain a gel mixture solid; and washing the solid obtained by high-temperature calcination with water to remove the soluble molten salt, and drying the solid to obtain a flaky α-Al2O3 powder.

The present invention provides a grease composition made from a base oil and an aluminum complex soap thickener, and the grease composition contains an effective amount of a polyalkylene polyamine dispersant to improve shear stability. The grease of the present invention has a penetration unit variation of less than 30 as measured using ASTM D217 after operating 100,000 two strokes.

This invention relates to the field of ceramic material preparation technology and discloses a method for preparing silicon-based ceramic materials, comprising: dispersing ceramic fibers and inorganic fillers to prepare a primary slurry; adding a silane coupling agent to form a silanol modification layer on the fiber surface; adding an aluminum-based inorganic flocculant to generate a polynuclear aluminum hydroxyl complex and adsorbing it onto the modification layer to obtain a composite slurry; filtration and dehydration to obtain a wet blank; inducing dehydration condensation of silanol and polynuclear aluminum hydroxyl complex in a thermal field of 90°C to 150°C, generating covalent silicon-oxygen-aluminum bonds in situ at fiber cross-nodes to construct a three-dimensional cross-linked framework; and impregnating and drying with silica sol under reduced pressure. This invention utilizes interfacial chemical bonding to replace organic adhesives, eliminating the smoking and blackening phenomena of materials under high-temperature environments, and enhancing the integrity and flexural strength of the framework structure through the microscopic condensation of polynuclear components.

The application relates to the alloy technical field and discloses a heat-treatment-free high-strength and high-toughness aluminum alloy and a production process thereof, which is prepared from magnesium, copper, manganese, cadmium, scandium, titanium, zinc, a toughening component and aluminum as raw materials and by adopting a heat-treatment-free process. The toughening component is a graphene-aluminum complex. In the smelting process, the toughening component can form an intercalation type mechanical stable structure with the aluminum alloy matrix. Meanwhile, alumina has good affinity with the aluminum melt, thereby generating a small amount of Al4C3 strengthening grains. The heat-treatment-free high-strength and high-toughness aluminum alloy not only can effectively avoid the problem that the interface delamination between the aluminum alloy and the graphene leads to the reduction of the strength of the aluminum alloy, but also can improve the internal organizational structure of the aluminum alloy, so that the strength and plasticity of the aluminum alloy are enhanced, and the production cost is reduced.

The invention provides an aluminum complex with a Salan ligand, which has the following general formula: R is one of alkyl, alkoxy or-OCH2Ph, and Ph is phenyl; r1 and R2 are both hydrogen, C1-C20 straight-chain, branched-chain or cyclic alkyl, C7-C30 mono-or multi-aryl substituted alkyl, C6-C18 aryl or halogen; R1 and R2 are both hydrogen, C1-C20 straight-chain, branched-chain or cyclic alkyl, C7-C30 mono-or multi-aryl substituted alkyl, C6-C18 aryl or halogen; r < 3 >, R < 4 >, R < 5 > and R < 6 > are hydrogen, aliphatic groups in C < 1 >-C < 40 >, aromatic groups in C < 6 >-C < 60 >, alkoxy groups, acyl groups or halogen; m is aluminum metal. The invention provides a novel Salan ligand, the ligand structure has many modification sites and is easy to modify, the catalytic activity and stereoselectivity of the catalyst can be adjusted by changing substituent groups on the benzene ring structure of the ligand, and rac-LA isotactic stereoblock polymerization is changed into heterotactic polymerization.

Provided is a curable polyorganosiloxane composition which has excellent storage stability in the form of a single liquid, has good curability and adhesiveness even at relatively low temperatures, and has an appropriate usable time. Specifically, provided is a curable polyorganosiloxane composition which has excellent curability even at a temperature of 80 DEG C or less and which has excellent adhesion to resins such as polyesters and polyphenylene sulfide. A one-pack type curable polyorganosiloxane composition comprising the following components (A) to (E): (A) a polyorganosiloxane having at least two alkenyl groups in one molecule; (B) a polyorganosiloxane having at least two silicon atoms bonded to hydrogen atoms in one molecule; (C) a hydrosilylation reaction catalyst; (D) a condensation reaction catalyst selected from the group consisting of titanium tetra-tert-butoxy, titanium bis (isopropoxy) bis (ethyl acetoacetate), and a chelate aluminum complex, or a condensation reaction product thereof; and (E) a curing inhibitor. The silicone rubber composition having a JIS A hardness of 5 or more is provided by curing. The composition may optionally contain a large amount of (H) an inorganic filler or the like.

Disclosed is an olefin metathesis polymerization catalyst system. The catalyst system comprises a metalate as pre-catalyst and an aluminum complex as co-catalyst, wherein the aluminum complex is an alkoxyalkylaluminum halide complex [(OR1)(R2)AlX1]n wherein OR1 is an alkoxy ligand derivable from an alcohol with a pKa in the range of from 18-30, wherein the alkoxy is optionally functionalized and wherein further n is an integer in the range of from 1-3, R2 is an alkyl, and X1 is an halide. Also disclosed is a method of manufacturing a molded article of a curable composition comprising the catalyst system. The method comprises providing the curable composition by combining the cyclic olefin and the olefin metathesis polymerization catalyst system in a mold; subjecting the composition to conditions effective to promote an olefin metathesis reaction of the cyclic olefin in the closed mold; and taking the reacted composition out of the mold to obtain the molded article. With the method a thin-walled article of a cyclic olefin polymer may be obtained having a glass transition temperature Tg above 60° C.

The invention relates to the technical field of refractory materials, in particular to a preparation method of a high-permeability-resistance phosphate combined silicon carbide refractory brick. According to the designed preparation method, the raw materials comprise high bauxite clinker, silicon carbide aggregate, zirconium oxide micro powder, graphene, an aluminum dihydrogen phosphate solution, magnesium-aluminum complex powder, clay and silicon dioxide micro powder. The preparation method comprises the following steps: removing iron from silicon carbide aggregate by hydrochloric acid, drying, and co-grinding the dried silicon carbide aggregate, pre-dried high bauxite clinker, zirconium oxide micro powder and graphene to obtain powder A; after the aggregate, part of the aluminum dihydrogen phosphate solution and water are subjected to wet grinding, the powder A, the clay and the silicon dioxide micro powder are added to continue to be mixed and ground, then the remaining aluminum dihydrogen phosphate and the magnesium-aluminum complex are supplemented, and plastic pug is obtained; the pug is dried in two stages after being subjected to high-pressure compression molding, and then is sintered at gradient temperature in a weak reducing atmosphere. According to the method, the anti-permeability performance of the refractory brick is remarkably improved, and through the synergistic effect of the composite binding phase, gradient firing and physical barrier, the micropore effect and the high anti-permeability effect of the refractory brick are achieved.

The invention relates to the technical field of building materials, in particular to a multifunctional magnesium oxysulfate cement floor with excellent water resistance and cracking resistance. Modifiers such as organic acid and alum are directly added into a magnesium oxysulfate cement formula, and the effect of improving the water resistance and cracking resistance of the obtained magnesium oxysulfate cement board is not obvious enough. In order to solve the problems, the invention provides the multifunctional magnesium oxysulfate cement floor with excellent water resistance and cracking resistance, and the multifunctional magnesium oxysulfate cement floor is formed by compounding a base cement board and a surface functional coating of the base cement board. The base cement board takes light burning powder and magnesium sulfate as main raw materials, and an organic acid aluminum complex solution, PVB and an inorganic reinforcing filler are added. And the functional coating adopts a multifunctional epoxy resin-based curing water-based coating with wear-resistant, anti-slip and antistatic properties. According to the cement board, the crystal structure can be effectively optimized and pores can be filled through the slow release effect of the aluminum malate complex in cement hydration, and the water resistance, the cracking resistance and the toughness are remarkably improved in combination with the toughening effect of PVB.

The present disclosure provides novel methods of making aluminum complexes with utility for promoting epoxide carbonylation reactions. Methods include reacting neutral metal carbonyl compounds with alkylaluminum complexes, such as the alkylaluminum complexes represented by Formula I, where Q is a nitrogen atom and the four Q groups are part of a single porphyrin ligand and Rq is selected from optionally substituted C1-12 aliphatic and optionally substituted aryl:

The application relates to the technical field of concrete admixtures, and particularly discloses a waterproof dense type accelerating agent as well as a preparation method and application thereof, which comprises the following components in parts by weight: 5-10 parts of a suspending agent, 50-250 parts of modified silica sol, 100-250 parts of an organic complex waterproof agent, 400-600 parts of an accelerating agent and water; wherein the modified silica sol is obtained by modifying acidic silica sol by a modifier, and the modifier is a silane coupling agent; and wherein the organic complex waterproof agent is an aluminum complex of a higher fatty acid. The waterproof dense type accelerating agent of the application can not cause a large amount of air entrainment of concrete after being mixed into the concrete, can fill microcracks of the sprayed concrete, and can improve the compactness of the concrete; meanwhile, the waterproof effect is formed on the inside and the surface of the sprayed concrete; and the addition of the organic complex waterproof agent can promote the coagulation of the concrete, and the accelerating agent can realize the rapid coagulation of the concrete.

The invention relates to the technical field of textile dyeing and finishing, and particularly discloses a knitted wool fabric dyeing method based on a tea residue nano composite material, which comprises the following steps: crushing waste green tea residues, adding a degumming agent for low-temperature degumming, carrying out high-temperature carbonization after degumming to prepare a porous biochar carrier, mixing with tea polyphenol and a zinc / aluminum complex according to a certain ratio, and drying to obtain the knitted wool fabric dyeing method based on the tea residue nano composite material. Synthesizing a Zn < O >-CS core-shell structure nano particle; adding the core-shell structure nanoparticles into the low-temperature dye liquor, adding a deep eutectic solvent, then adding polyphenol oxidase, and introducing air or oxygen to maintain the oxygen content of a reaction system; immersing the wool fabric into a chitosan acetic acid solution to form a compact protective layer; and preparing a double-enzyme synergistic solution, immersing the wool fabric into the double-enzyme synergistic solution, slowly stirring, and carrying out microwave inactivation and color fixation on the wool fabric after the reaction is finished. The dyeing method for the knitted wool fabric is green and safe, the dye adsorption capacity is enhanced, and the wool fabric has the antibacterial and anti-ultraviolet effects.

A method of generating hydrogen comprising contacting an aqueous solution with an active aluminum complex comprising aluminum, AIN, gamma-Al2O3, and optionally a carbonaceous material. The active aluminum complex can be safely stored and can be used for safe on-demand generation of hydrogen in water.

The invention belongs to the technical field of wet-process phosphoric acid, and particularly relates to a method for breaking a fluorine-aluminum complex and recovering aluminum and magnesium by introducing a boron source. The method comprises the following steps: introducing a boron source into a fluorine-containing aluminum complex solution, and reacting to break the fluorine-containing aluminum complex so as to obtain a reaction solution; wherein the molar ratio of the fluorine element in the fluorine-containing aluminum complex solution to the boron element in the boron source is 12: 1-3: 8; adding ammonium sulfate A into the reaction liquid, and crystallizing to obtain ammonium aluminum sulfate crystals and ammonium aluminum sulfate crystal removal mother liquor; adding ammonium sulfate B into the ammonium aluminum sulfate removal crystallization mother liquor, and crystallizing to obtain ammonium magnesium sulfate crystals and ammonium magnesium sulfate removal crystallization mother liquor; and adding a potassium source into the ammonium magnesium sulfate removal crystallization mother liquor, uniformly mixing, and carrying out precipitation reaction to obtain potassium fluoborate precipitate. According to the method, the problem that a fluorine-aluminum complex hinders recycling of aluminum crystals is solved, recycling of the strip liquor can be achieved, meanwhile, aluminum and magnesium elements are recycled respectively, fluorine elements are recycled, and the purity of recycled aluminum, magnesium and fluorine products is high.

The present application belongs to the technical field of water treatment, and particularly relates to a self-assembled sea anemone-like nanoflocculant and a preparation method thereof. The present application first prepares an aliphatic-quaternary ammonium / imidazole-silicon aluminum complex, utilizes the characteristics of long alkyl chain hydrophobicity and double cation hydrophilicity, forms a "core-shell" structure micelle through self-assembly, and then forms an intelligent sea anemone-like nanoflocculant solid through freeze-drying. The self-assembled sea anemone-like nanoflocculant removes the suspended solids and colloids through the "core-shell" structure, wherein the "shell" part is an inorganic flocculant, the "core" part is an organic flocculant, and the "shell" part is dissolved to remove the suspended solids and colloids and drive the outward turning of the organic functional groups of the "core" part, like the tentacles of sea anemones capturing water-soluble organic matters.

The application discloses a method for improving lithium recovery rate in aluminum electrolysis lithium-containing waste residue, and belongs to the technical field of solid waste resource recovery. Part of waste electrolyte, anode carbon residue and overhaul residue generated in aluminum electrolysis contain fluorine aluminum compounds and a small amount of lithium elements. After acid liquid leaching, lithium and part of fluorine aluminum components are transferred into liquid phase to form lithium-containing liquid with recovery value. The acid leaching liquid needs to be purified by adding alkali before lithium precipitation. Fluorine aluminum complex ions are easy to hydrolyze and generate hydroxyl aluminum fluoride colloid precipitate with fine particle size and negative surface during the process. The precipitate is easy to adsorb Li⁺, leading to loss of lithium with filter residue. In view of the above problems, a cationic interfacial modifier is introduced in the process of adding alkali. The cationic group in the cationic interfacial modifier is preferentially adsorbed on the negative potential points on the surface of the colloid particles, weakening the adsorption of the colloid particles on Li⁺. The cationic interfacial modifier promotes flocculation and aggregation of the colloid particles, particle size growth, reduction of filter residue entraining lithium-containing mother liquor, improvement of lithium retention rate in the purified liquid, and preparation of lithium salt products.