607results about "Aluminium silicates" patented technology

The invention belongs to the technical field of wastewater treatment, and particularly relates to multi-element doped synergistically modified ferrihydrite as well as a preparation method and application thereof, and the ferrihydrite is doped with at least one rare earth element and at least one of an aluminum element and a silicon element; the doping amount of the rare earth elements in the ferrihydrite is 0.5-20wt%; the doping amount of the aluminum element in the ferrihydrite is 0-20wt%; the doping amount of the silicon element in the ferrihydrite is 0-20wt%. Compared with the prior art, the method solves the problems that in ferrihydrite single-element modification in the prior art, although stability is improved through Al / Si doping, element modification in the same period is limited in improvement of the adsorption capacity, and the specific recognition capacity on phosphate radicals cannot be improved; and the anti-interference performance of the rare earth doped in the complex water matrix still needs to be improved. According to the scheme, rare earth and Al / Si doping are combined, so that improvement of phosphorus adsorption stability, adsorption capacity, specific recognition capability and anti-interference performance of ferrihydrite is realized synergistically.

An adsorbent composition comprising: a plurality of particles of an acid-activated clay with a predetermined particle size. Each particle may have a surface comprising metal oxides or metal hydroxides and each particle may have a surface modified by coupling the metal oxides to ligands comprising amino-silane coupling agents configured to adsorb impurities. Each amino-silane coupling agents may comprise an alkoxysilane group and an amine group. The alkoxysilane group may couple to the metal oxide or metal peroxide of each particle. The adsorbent composition may comprise the amino-silane coupling agent and the acid-activated clay with a wight ratio between 2:2 and 3:1 (the acid-activated clay: the amino-silane coupling agent). The acid-activated clay may comprise a plurality of pore with a predetermined diameter formed between particles.

The invention provides a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method and application, two or more model adsorption materials with concentrated pore size distribution are used, and filling type adsorption with high pore volume utilization rate can be formed in pores with a specific size or below due to adsorption of volatile organic compounds (VOCs) on a porous material; and a matching relation equation between the filling type adsorption critical aperture and the adsorption partial pressure and a rule of changing along with the adsorption temperature are explored. According to the method, the partial pressure is normalized relative to the saturated vapor pressure at the respective adsorption temperature, and the parameter saturated vapor pressure related to the adsorption temperature is introduced into an equation as a variable, so that an equation of critical pore diameters suitable for adsorption of VOCs at different temperatures and concentrations is established; and a cross-adsorption-temperature industrial organic waste gas adsorbent type selection method is formed. The method provided by the invention can provide a quantitative reference basis for development of VOCs efficient adsorption materials and technologies suitable for different adsorption temperatures.

The invention belongs to the field of adsorption materials, and discloses a porous lignin fiber adsorption material and a production process thereof, the porous lignin fiber adsorption material comprises the following raw materials by weight: 40-60 parts of lignin fiber, 20-30 parts of bamboo fiber, 5-15 parts of chitosan, 5-10 parts of sodium bicarbonate, 5-10 parts of attapulgite, 5-10 parts of zeolite, and 2-5 parts of magnetic nanoparticles; the invention aims to provide the production process of the porous lignin fiber adsorption material, the problems that the existing lignin fiber adsorption material is poor in pore structure, limited in adsorption performance, difficult to separate and the like are solved through an innovative raw material formula and an optimized production process, efficient adsorption of light components in asphalt is realized, the stability of an asphalt mixture is enhanced, and the service life of the asphalt mixture is prolonged. Meanwhile, heavy metal ions, organic pollutants and the like are efficiently adsorbed and rapidly separated, the production energy consumption is reduced, and the environmental protection property and economical efficiency of the process are improved.

The invention relates to the technical field of silicon-aluminum aerogel preparation, in particular to a method for preparing high-temperature-resistant silicon-aluminum aerogel by using a coal gangue one-step method, which comprises the following steps: S1, crushing, grinding and sieving coal gangue, mixing the coal gangue with an alkaline solid, and calcining to obtain alkali fusion powder; s2, the alkali fusion powder is subjected to acid treatment and suction filtration, and a silicon-aluminum solution is obtained; s3, adding polystyrene-coated zirconium oxide particles into the silicon-aluminum solution, and sequentially carrying out gelation, primary aging, solvent washing, water washing and secondary aging; s4, washing, replacing and modifying the gel; and S5, drying the hydrophobic wet gel obtained in the step S4 at normal pressure to obtain the silicon-aluminum aerogel. The silicon-aluminum aerogel prepared by the method has the advantages of low density, good thermal stability, high specific surface area, strong hydrophobic property and high strength.

The invention provides an adsorption process for recovering ethylene from refinery dry gas through combination of MOF and zeolite, raw material gas is refinery dry gas, a main body contains hydrogen, carbon dioxide, C1-C3 low-carbon hydrocarbon gas and the like, the content of C2H4 is about 10%, a pre-decarburization process and an associated bed process are introduced, the adsorption capacity of an adsorbent is protected, and the content of ethylene is reduced. The non-compliant purity ethylene gas in the pressure swing adsorption process is re-enriched and recovered through an associated bed; in the initial stage of adsorption separation, after CO2 is removed through a customized or commercialized adsorbent, C2H4 enrichment and purification are directly carried out, and by introducing an associated bed, ethylene in gas passing through the adsorption process and ethylene gas in the preliminary desorption process of the adsorption bed are captured again, so that the ethylene recovery rate in the process is improved.

The invention belongs to the technical field of fly ash solid waste resource utilization, and particularly relates to a method for preparing flaky alumina by using fly ash, which is characterized by comprising the steps of fly ash pretreatment, intermediate preparation and alumina preparation, ammonium fluoride used in the alumina preparation step is a recycling product of fluorine-containing tail gas in the step, and ammonium fluoride used in the alumina preparation step is a recycling product of fluorine-containing tail gas in the step. The preparation method comprises the following specific operation steps: 1) pretreating fly ash, namely treating fly ash with a NaOH solution and an HCl solution to obtain a mixture of quartz and mullite; (2) preparing an intermediate, namely reacting a mixture of quartz and mullite with CeO2 to obtain a K3Al (SO4) 3 intermediate; and 3) preparing aluminum oxide, purifying the K3Al (SO4) 3 intermediate, grinding and mixing the purified K3Al (SO4) 3 intermediate and ammonium fluoride crystals according to the F / Al molar ratio, and roasting at high temperature to obtain a flaky aluminum oxide product. The method has the beneficial effects that the problem of low purity of flaky aluminum oxide in the existing method for preparing the aluminum oxide from the fly ash is solved, and the purity of the flaky aluminum oxide is 99.2-99.8%.

Processes and apparatuses for degrading PFAS into calcium fluoride, carbon dioxide, and water. PFAS are heated and introduced to a calcium base which will degrade the PFAS. The PFAS may be in a stream that is a PFAS enriched stream formed by desorbing the PFAS from an adsorbent which removed the PFAS from a contaminant stream. The PFAS may be desorbed in the presence of the calcium base. The calcium base may be calcium hydroxide, calcium oxide, calcium carbonate, or combinations thereof.

The invention provides a polysilicate aluminum zirconium coagulant as well as a preparation method and application thereof, and relates to the technical field of solid waste recycling. The preparation method of the polysilicate aluminum zirconium coagulant comprises the following steps: S1, activation preparation of a polysilicate solution; S2, introduction and pre-complexation of a metal salt solution; and S3, alkalization induced polymerization and curing. According to the invention, the efficient charge neutralization capability of zirconium and aluminum metal ions and the long-chain network structure characteristic of polysilicic acid are organically combined through a copolymerization reaction by molecular design, the developed polysilicate aluminum zirconium coagulant can maintain a good coagulation effect in a wide pH range, is suitable for treating residual sludge with different sources and properties, and has a good coagulation effect under the dosage of 7.5%. The CST value is reduced to 35.4 s from 190.7 s, the water content of a filter cake is reduced to 77.4%, and the Zeta potential is-8.2 mV, so that the polysilicate aluminum ferric coagulant is obviously superior to a traditional polysilicate aluminum ferric coagulant, and has the advantages of high operation flexibility, good process stability and good application prospect.

The invention provides a chitosan composite material and a compound feed additive, and relates to the technical field of feed additives. The chitosan composite material comprises cross-linked chitosan and a porous carrier, the cross-linked chitosan is coated on the surface of the porous carrier; the porous carrier comprises a first porous carrier and a second porous carrier, the average particle size of the first porous carrier is 80-150 [mu] m, and the average particle size of the second porous carrier is 10-30 [mu] m. The chitosan composite material disclosed by the invention has relatively good heavy metal ion adsorption performance and can be used as a feed additive.

A hybrid catalyst for simultaneous dehalogenation and cracking of plastic derived oil includes a plurality of composite particles, wherein each of the composite particles includes red mud particles and beta zeolite particles. A process for upgrading plastic derived oil includes contacting the plastic derived oil with the hybrid catalyst. A system for upgrading plastic derived oil includes an FCC reactor containing the hybrid catalyst.

The present invention provides a modified silica aerogel powder having a higher water repellency and a larger contact angle, and a method for producing the same. At the same time, the present invention provides an aerogel slurry having a lower thermal conductivity and a method for producing the same. The present invention also provides a method for producing an aerogel insulating felt having low thermal conductivity, high mechanical strength, and capable of relatively well resolving the problem of powder shedding. The method for producing the modified silica aerogel powder includes the steps of (1) modifying halloysite nanotubes with dodecyl methacrylate and pentafluorophenyl methacrylate, (2) preparing a silica sol, (3) adding the modified halloysite nanotubes to the silica sol to prepare a wet gel, and (5) preparing the wet gel into the modified silica aerogel powder. The present application also provides a method for producing an aerogel slurry from the modified silica aerogel powder, and a method for producing an aerogel insulating felt from the aerogel slurry.

The invention discloses a waste sulfuric acid treatment method and device, the device comprises a sintered filter element filter, a fine filtration coalescer, an adsorption tank and a membrane separator which are connected in sequence, and the fine filtration coalescer adopts a ceramic membrane tube or a polytetrafluoroethylene membrane tube or a silicon carbide lining membrane tube as a filter material; an adsorption material in the adsorption tank is one or a combined adsorption material of more than two of activated carbon, a modified molecular sieve, a metal organic framework material and a nano adsorption material; and the membrane separation system adopts one or a combined membrane of more than two of an ultrafiltration membrane, a reverse osmosis membrane and an electrodialysis membrane. The alkylation waste acid regeneration process can be simplified, the occupied area of the device is saved, the engineering investment is reduced, and the operation cost is greatly reduced compared with that of an existing process technology; according to the method, a physical separation means is adopted, organic polymeric oil, dissolved organic matters, dissolved salts and other impurities in the alkylated waste sulfuric acid can be effectively removed without decomposing and reconstructing the waste sulfuric acid, and the concentrated sulfuric acid after concentration completely meets the production requirements of an alkylation device.

The present invention belongs to the technical field of catalytic materials and relates to a silicon-aluminum material, its preparation and a low-coking, high-activity heavy oil conversion catalytic cracking catalyst. The silicon-aluminum material has an anhydrous weight chemical formula of (0-1)Na2O·(15-50)Al2O3·(85-50)SiO2, a most probable pore diameter of 10-100 nm, and a specific surface area of ​​150-600 m 2 / g, a pore volume of 0.5-1.5 ml / g, and a pore volume of pores with a pore diameter greater than 10 nm accounting for 70%-98% of the total pore volume. Its preparation method comprises the steps of adding an alkaline silicon source to an acidic aluminum source, contacting with a base, and washing. The low-coking, high-activity heavy oil conversion catalytic cracking catalyst contains the aforementioned silicon-aluminum material and an in-situ crystallized Y-type molecular sieve. The catalytic cracking catalyst has good coke selectivity.

The invention relates to a fast ion conductor-stabilizer composite coated lithium manganese iron phosphate material as well as a preparation method and application thereof. The lithium manganese iron phosphate material comprises a lithium manganese iron phosphate inner core and a coating layer on the surface of the lithium manganese iron phosphate inner core, the coating layer is obtained by mixing sodium aluminosilicate, magnesium metaaluminate, a coating carbon source and a lithium supplement agent, coating the surface of the lithium manganese iron phosphate inner core with the mixture, and performing sintering treatment. According to the invention, sodium aluminosilicate and magnesium metaaluminate are combined with conductive carbon to carry out co-coating treatment on lithium manganese iron phosphate, and in a high-temperature sintering process, part of Na < + > / Al < 3 + > / Mg < 2 + > multi-ions are co-embedded into a near surface layer of a lithium manganese iron phosphate crystal, so that a unit cell structure which is more stable in structure and easier in Li < + > diffusion is formed. In the high-temperature sintering process, part of magnesium metaaluminate reacts with the lithium supplement agent to form an Al-based fast ion conductor, and sodium aluminosilicate has a wider Li < + > diffusion channel, so that the material has excellent rate capability.

The present invention discloses a fly ash-based geopolymer carbon sequestration and adsorption material and a preparation method thereof, belonging to the technical field of engineering materials. The material of the present invention is modified by adding 13X zeolite with a specific particle size, and its carbon sequestration and adsorption performance is significantly improved through an in-situ hydrothermal conversion process. The fly ash-based geopolymer material and the preparation method disclosed by the present invention are simple and easy to implement, and are easy to be implemented in industrial production, and can overcome the disadvantages of the current direct reaction of solid waste with CO2 to generate mineralized (carbonate) filling materials, low mineralization efficiency and unstable reaction products. The geopolymer carbon sequestration and adsorption material of the present invention has a wide application prospect, provides a new method for synergistically solving carbon sequestration, solid waste disposal, and reuse of abandoned underground spaces, and has important environmental protection, social and economic benefits.

The invention discloses a curcumin ion-based composite material for cobalt separation, a preparation method and application, the material is prepared by compounding curcumin ionic liquid and a porous material, and the porous material is a carbon-based material, an inorganic porous material or a resin material. The problem that efficient separation of Co in wastewater cannot be achieved in the prior art is solved. Compared with the prior art, amino acid modified curcumin is introduced into the ionic liquid as anions for the first time and is loaded on the porous material, and the prepared composite material can quickly and specifically adsorb Co metal ions and can be prepared into a membrane or column separation resin so as to recover cobalt from waste power batteries and remove cobalt from radioactive wastewater. The adsorption rate is high, desorption is not prone to occurring, the capture capacity and capture rate are high, and recycling can be achieved.

The invention discloses an adsorption catalyst as well as a preparation method and application thereof, and relates to the technical field of environmental protection. The adsorption catalyst comprises a porous carrier, and inorganic nonmetal nanoparticles and a metal oxide catalyst are loaded on the porous carrier; wherein the inorganic nonmetal nanoparticles are selected from at least one of titanium dioxide, silicon dioxide and zinc oxide; the metal oxide catalyst is selected from at least one of manganese oxide, iron oxide and copper oxide. The adsorption catalyst has the characteristics of efficient adsorption, low-temperature catalysis and high catalytic conversion rate; the preparation method is simple, low in cost and easy for industrial production; when the catalyst is used for treating volatile organic compounds, the catalytic temperature is remarkably improved, the treatment efficiency of VOCs is effectively improved, and the catalyst has a wide application prospect in the field of VOCs waste gas treatment.

The invention provides a positive electrode material and a preparation method thereof, a battery monomer, a battery device and a power utilization device. The positive electrode material comprises a sodium transition metal oxide and a silicate material located on the surface of the sodium transition metal oxide, the positive electrode material has the following chemical formula: NaxMyNzO2 / (aNa2O.nSiO2-XrOt.SiO2) b, M comprises one or more of Fe, In, Co, Mn, Ni and Cr, N comprises one or more of Cu, Li, Ti, Zr, K, Sb, Nb, Mg, Ca, Mo, Zn, W, Bi, Sr, Sn, Ga and Al, and X comprises one or more of Na, Li, K, Mg, Ca, Zn, Al, Cr, Sr, Sn and Sb; 0.58 < = x < = 1.05, 0 < y < = 1, 0 < = z < = 1, 0 < y + z < = 1, 1 / 3 < = r / t < = 2, 1 < = n / a, and 0 < b < = 0.2. The positive electrode material provided by the invention can improve the rate capability and the processability of the battery monomer.

The invention relates to a preparation method and application of a hardness removal agent, and the method comprises the following steps: 1) alkali fusion reaction: mixing and fusing bauxite and NaOH to generate soluble sodium aluminate NaAlO2; 2) compounding silicon and aluminum: dissolving aluminum silicate in hot water, adding silica sol, stirring and mixing, and regulating the pH value to 11-12 by using NaOH; an aluminosilicate precursor gel is formed; 3) hydrothermal crystallization: transferring the aluminosilicate precursor gel into a high-pressure reaction kettle, and carrying out hydrothermal reaction to promote polymerization of a silicon-aluminum network; and 4) post-treatment: cooling aluminosilicate, centrifugally washing the aluminosilicate until the aluminosilicate is neutral, drying the aluminosilicate at 110 DEG C, and grinding the aluminosilicate to obtain a white powder product. A silicon-aluminum network structure of the hardness removal agent prepared by the method has regular pore channels, the highest calcium and magnesium removal rate can reach 90% or above, the hardness removal agent is high in anti-interference performance, is kept stable in a pH range of 6-12, is not influenced by common Cl <-> and SO4 < 2-> in water, and is high in stability.

The invention relates to the technical field of adsorbents, and provides an efficient molecular sieve adsorbent for adsorbing carbon dioxide and a preparation method of the efficient molecular sieve adsorbent aiming at the problem that a traditional Na-type 13X molecular sieve is poor in CO2 adsorption performance under low partial pressure. The adsorbent is prepared by using a template agent, aluminum hydroxide, nano aluminum oxide and silica sol as raw materials through the steps of crystallization, calcination and the like. The template agent is a functional molecule integrating a phosphonic acid group, long-chain alkyl and polyethylene glycol dicarboxylic acid, the phosphonic acid group stabilizes a skeleton, the long-chain alkyl provides a graphene-like layer to inhibit water molecule adsorption, and the polyethylene glycol dicarboxylic acid guides micropores to grow orderly and cooperate with each other to form the efficient molecular sieve adsorbent for carbon dioxide adsorption. The CO2 adsorption capacity, the dynamic adsorption rate and the moisture resistance of the adsorbent under low partial pressure are improved.

The invention discloses a magnetic geopolymer as well as a preparation method and application thereof, and relates to the technical field of solid waste resource utilization and wastewater treatment. The preparation method comprises the following steps: drying nickel slag, crushing and grinding, adding calcium oxide to adjust alkalinity, and heating and melting to obtain a nickel slag melt; the nickel slag melt is subjected to water quenching, and magnetic slag micro powder is obtained through drying, crushing and screening; and mixing the magnetic slag micro powder with an alkaline activator, injecting the mixture into a mold, performing constant-temperature maintenance, demolding, and crushing to obtain the magnetic geopolymer. The magnetic geopolymer prepared by the invention has high adsorption capacity and rapid adsorption kinetics for multiple heavy metal ions in water, and has excellent magnetic separation performance.

The invention provides a carrier material as well as a preparation method and application thereof, the preparation method of the carrier material comprises the following steps: 1) mixing a mixed solution containing a polyhydroxy compound and / or a polyamine compound, polycarboxylic acid and a metal source with a porous material to obtain a mixed system; wherein the mass of the mixed solution is 40-60% of the mass of the porous material; and 2) carrying out post-treatment including polymerization treatment, drying treatment and roasting treatment on the mixed system to obtain the carrier material. According to the preparation method of the carrier material provided by the invention, metal ions enter the pore channels of the porous material, the metal material can be uniformly distributed on the inner surfaces of the pore channels under the pore channel confinement effect, and the carrier material is applied to a catalyst, so that the temperature of a catalytic oxidation reaction of a volatile organic compound can be reduced.

Provided are spherical composite oxide particles having high crystallinity, white color, and low coefficient of thermal expansion. The composite oxide particles according to the present invention are polycrystalline, the main crystal phase contains cordierite and / or hexagonal cordierite, and the coefficient of thermal expansion of the composite oxide particles according to the TMA method is 1.5 ppm or less.

This invention relates to the field of wastewater treatment technology, specifically to a highly efficient adsorbent wastewater treatment agent and its preparation method, comprising the following raw materials in parts by weight: 50-70 parts activated carbon powder, 8-12 parts deionized water, 5-10 parts ammonium bicarbonate, 1-3 parts sodium dodecyl sulfate, 15-25 parts additive A, and 8-15 parts additive B. In this invention, the stably loaded cerium ions can effectively exert their specific coordination and capture effect on heavy metals. The chitosan introduced into the carrier can enhance the electrostatic and chelate adsorption of anionic pollutants and organic molecules. Simultaneously, the well-developed pores formed after shellac carbonization combine with the network structure of chitosan, further increasing the specific surface area of ​​the material and the adsorption capacity of organic pollutants, achieving highly efficient and stable adsorption of heavy metals, dyes, and organic pollutants.

The utility model relates to the field of zeolite activation, in particular to an activation device for preparing zeolite with a porous structure, which comprises a hollow activation kettle, a cover plate is detachably connected to the upper side of the activation kettle, a first motor is fixedly connected to the upper side of the cover plate, and a coil stock stirring component is fixedly arranged on the lower side of the output end of the first motor. The activation kettle is used for fully mixing zeolite and an acid solution, a discharging part is rotationally arranged at the bottom of the inner side of the activation kettle and used for discharging activated zeolite, and the upper side of the cover plate is fixedly communicated with an acid solution adding pipe; according to the activation device for preparing the zeolite with the porous structure, the first motor is matched with the spiral material rolling pipe and the rotating wheel for use to drive the zeolite in the activation kettle to roll upwards, so that the zeolite and an acid solution are fully mixed and activated, and the output end of the second motor is matched with the spiral material discharging pipe for use; the fully mixed zeolite can be conveniently transported to one side of the sleeve and is downwards discharged through the collecting cylinder, so that the mixed and activated zeolite can be conveniently collected by a worker.

The invention discloses a composite porous phosphorus removal filter material and a preparation method thereof, the filter material is prepared by taking aluminum hydroxide, limestone, concrete, perlite, modified zeolite, a foaming agent and a mixture of euglena, chlorella and spirulina as main components through the steps of pulping, foaming, coating, curing, crushing, screening and the like. The phosphorus removal efficiency is remarkably improved through ion exchange and chemical adsorption effects of the modified zeolite, the performance of the filter material is further enhanced through biological adsorption and biological assimilation effects of the microalgae, and in addition, the phosphorus removal effect of the filter material is further improved through stable precipitates formed by special components and phosphate. The filter material has the advantages of efficient phosphorus removal, environmental protection, no pollution, multifunctionality, economical efficiency and the like, is suitable for the fields of sewage treatment plants, lake remediation, aquaculture and the like, and has the advantages of high phosphorus removal efficiency, simple preparation process, low raw material cost and easiness in industrial production.

The application discloses a kind of water purification concrete, each component and the weight fraction it includes: cementitious material 30-55 parts, aggregate 65-95 parts, composite slurry 10-20 parts, air entraining agent 0.003-0.01 parts, water reducing agent 0.4-0.8 parts, mixing water 10-15 parts;The cementitious material includes γ-dicalcium silicate, slag and steel slag;The composite slurry is the mixed solution of chitosan and nanometer titanium dioxide.The water purification concrete in the application can significantly improve the water purification efficiency, realize self-cleaning, avoid concrete pore blockage, greatly extend the water permeability and water purification capacity of water purification concrete, has important economic and environmental benefits, and is suitable for popularization and application.

The invention relates to the field of adsorbent materials, in particular to a calcium-based adsorbent and a preparation method and application thereof, the preparation method comprises the following steps: S1, performing first mixing treatment on a calcium-containing adsorption active component and an additive to obtain a first material; s2, carrying out second mixing treatment on the first material and a solution containing alkali metal ions to obtain a second material; s3, the second material is subjected to strip extrusion treatment, and a strip-shaped material is obtained; carrying out drying treatment and roasting treatment on the strip-shaped material; wherein the additive comprises a silicon-aluminum compound containing an alkali metal element. The calcium-based adsorbent provided by the invention has relatively high adsorption capacity and relatively good cycle stability.

The invention relates to the field of wastewater treatment, in particular to a method for treating wastewater containing phosphorus, aluminum, silicon and organic amine generated in a molecular sieve preparation process, which comprises the following steps: 1) adding a pH regulator and an optional silicon-aluminum component regulator into the wastewater to enable the pH of the wastewater to be 10-14 and the molar ratio of silicon to aluminum in the wastewater to be (1.0-1.8): 1, obtaining a first mixture containing an oil phase; 2) distilling the first mixture obtained in the step 1) to obtain a gas phase and a second mixture; 3) performing solid-liquid separation on the second mixture obtained in the step 2) to obtain a first solid phase and a third mixture; and 4) crystallizing the third mixture obtained in the step 3) to obtain a second solid phase. According to the method, harmless treatment can be conducted on the wastewater, organic amine, phosphorus, aluminum, silicon and the like in the wastewater can be efficiently recovered, and the recovery rate and the purity of the recovered product are high.