616 results about "Crystallization temperature" patented technology

The invention discloses a nylon elastomer preparation method, which comprises: S1, weighing preparation raw materials of a nylon elastomer according to a feeding ratio, and weighing the preparation raw materials by using a weighing device, the nylon elastomer is prepared from the following raw materials: tridecane diamine, tridecane dibasic acid, dodecanediamine, dodecanedioic acid, undecanediamine, undecanedioic acid, decamethylene diamine, sebacic acid, pentamethylene diamine, glutaric acid, hexamethylenediamine, adipic acid, caprolactam, and one or more of polyether amine and polyether alcohol; and S2, feeding the preparation raw materials weighed in the step S1. In the preparation process of the nylon elastomer, the nylon elastomer with different melting points, different crystallization temperatures, different strengths and different elongation at break is produced by adopting a multi-component copolymerization mode and adjusting the types and the molecular weights of polyether amine and polyether alcohol by adjusting the types and the proportions of binary acid and diamine, so that the nylon elastomer is suitable for different use environments; the utilization rate is improved.

The preparation process comprises the following steps: dissolving ammonium dimolybdate, ammonium rhenate and water at a high temperature, then adding zirconium hydroxide, uniformly mixing, carrying out vacuum drying, carrying out two-stage hydrogen reduction on the obtained precursor composite powder, and carrying out vacuum drying to obtain the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains, thereby obtaining the zirconium dioxide reinforced phase-containing molybdenum-rhenium alloy capable of inhibiting abnormal growth of crystal grains. Zirconium oxide reinforced molybdenum-rhenium composite powder obtained after reduction is subjected to cold isostatic pressing, pressureless sintering and hot isostatic pressing to obtain zirconium oxide reinforced molybdenum-rhenium alloy, and then the zirconium oxide reinforced molybdenum-rhenium alloy is obtained through high-temperature rolling and recrystallization annealing treatment. According to the method, atomic-level mixing of molybdenum and rhenium is achieved through liquid-phase doping, the microstructure of the molybdenum-rhenium alloy is more uniform and fine due to addition of ZrO2, the recrystallization temperature is increased, and the phenomenon that sintered grains of the molybdenum-rhenium alloy grow abnormally is relieved. And by optimizing the annealing process and regulating and controlling the annealing mode, grains are rearranged to form a more uniform microstructure, abnormal growth of the grains is further inhibited, and the high-temperature tensile strength and the ductility of the molybdenum-rhenium alloy are improved.

Lithium-aluminum-silicon glass ceramic and a preparation method therefor. The addition of a V2O5 and Ta2O5 composite nucleating agent reduces the crystallization temperature of glass and improves the stability of the glass; a doping agent, such as CeO2, significantly accelerates the growth speed of crystals, thereby nucleating and crystallizing the glass at relatively low temperatures and improving the transmittance of the glass; a co-solvent, such as B2O3, reduces the high-temperature viscosity of the glass, thereby reducing the activation free energy during the glass crystallization process and facilitating the crystallization and processing molding; a 3D hot bending process comprises the stages of preheating, pressurizing, annealing and cooling, a copper mold transfers heat to the glass by means of heat conduction, such that the glass is evenly heated during the heating process, and natural cooling can prevent the problem of glass being broken or having an inaccurate dimensional accuracy caused by excessive fast cooling; and the graft modification on the surface of the glass significantly improves the hydrophobic property of the glass, such that the comprehensive performance of the glass is good.

The invention belongs to the field of metal powder laser melting additive manufacturing, and discloses a method for eliminating solidification thermal stress through a metal laser melting additive manufacturing technology. The method is realized by adopting SLM equipment and comprises the following steps: step 1, melting laser forming; the SLM equipment comprises a galvanometer, a high-frequency pulse laser, a collimating and beam expanding lens, a melting laser and an infrared thermometer; step 2, starting an infrared thermometer, detecting temperature values of solidified powder at different interval durations by an infrared temperature measurement scanning system at the first layers of scanning forming of the part, and determining the scanning lag duration according to the principle that the temperature of the material is 50 DEG C higher than the recrystallization temperature of the material; and then high-frequency forging laser is started at the same time interval to perform forging treatment, so that the material is subjected to impact forging vibration at the temperature to realize a recrystallization process, and the stress completely disappears. According to the method, the problem that failure is often caused by stress deformation when a selective laser melting method is adopted for manufacturing large-size parts is solved.

The invention discloses a pyraclostrobin preparation device which comprises a reaction kettle and further comprises a temperature control cooling box, the temperature control cooling box is provided with a containing space, a partition part is arranged in the temperature control cooling box, the partition part divides the containing space into a cooling channel and a temperature control channel, and the temperature control channel is communicated with the cooling channel. The temperature control cooling box and the separation part are both made of heat conduction materials, a hydrothermal solution is introduced into the temperature control channel, and the temperature of the hydrothermal solution is higher than the crystallization temperature of pyraclostrobin. According to the pyraclostrobin preparation device provided by the invention, the reaction kettle and the temperature control cooling box are combined for use, so that a pyraclostrobin solution can circularly move between the reaction kettle and the temperature control cooling box, and precipitates and irregular crystals are fed into the reaction kettle for re-processing; the production speed of the pyraclostrobin crystals is increased, and meanwhile continuous production can be achieved.

The invention relates to the technical field of image data processing, in particular to a stevioside impurity detection method based on industrial vision, which comprises the following steps: placing a supersaturated solution in a crystallization container for cooling crystallization to obtain surface images of each detection area under different illumination angles so as to determine a gray level fluctuation coefficient of each detection area; screening a feature detection area, acquiring a surface image of the feature detection area at a feature acquisition illumination angle to identify a feature contour, acquiring feature contours at different crystallization temperatures, determining a contour growth coefficient, determining a risk tendency category of the feature contour, and determining a mode of performing impurity marking; according to the method, a high-risk region where impurities exist is rapidly identified, the impurity marking mode is adaptively adjusted according to different crystal contour features in the surface image of the stevioside crystal, and the stevioside impurity detection reliability and detection efficiency are improved.

The invention discloses an overload protection method for an electric compressor controller, which comprises the following steps: when the rotating speed of a compressor is in a low rotating speed interval, executing a compressor load dynamic protection strategy; when the compressor load dynamic protection strategy is executed, compressor parameters are obtained in real time, a phase current effective value protection threshold value is preset based on the compressor load, the compressor rotating speed and the compressor rotating speed, and the phase current effective value protection threshold value is obtained according to the current compressor load, the compressor rotating speed and the compressor rotating speed; and the current compressor phase current effective value is compared with the phase current effective value protection threshold value, and whether an overload protection shutdown strategy is triggered or not is judged. Under the working conditions of low rotating speed and high load, before the heat of the IGBT begins to accumulate but the temperature value does not reach the crystallization temperature 175 DEG C, the overload shutdown protection strategy is preferentially reflected, and the thermal breakdown of the IGBT caused by frequent over-temperature is avoided. The dynamic overload protection strategy is higher in precision and faster in response, and preposed protection of the temperature of the IGBT is achieved in advance in an overload protection mode under the low-rotating-speed and high-load working condition.

The invention relates to an electrode plate, a battery and an electric device. The electrode pole piece comprises a current collector and a film layer arranged on at least one side of the current collector, the film layer comprises an active substance and multiple fluorinated polymers, the crystallinity of one of the multiple fluorinated polymers is marked as Xc < 1 >%, the cold crystallization temperature is marked as Tc < 1 > DEG C, the crystallinity of the other one of the multiple fluorinated polymers is marked as Xc < 2 >%, and the cold crystallization temperature is marked as Tc < 1 > DEG C. The cold crystallization temperature is recorded as Tc2 DEG C, and the various fluorinated polymers meet the following conditions: (Xc2-Xc1) / Xc1 is more than or equal to 20% and less than 400%, and (Tc2-Tc1) / Tc1 is more than or equal to 30% and less than 250%.

The invention belongs to the technical field of catalyst carrier materials, and particularly relates to a preparation method of mesoporous ultra-stable aluminum oxide. Pseudo-boehmite is prepared by adopting a double-aluminum method, alumina powder is obtained after roasting, a layer of fibrous pseudo-boehmite is prepared in the pore structure of the alumina powder, and the pore structure and the specific surface area of mesoporous super-stable alumina are controlled by controlling the crystallization pH value and the crystallization temperature in the reaction process. Sodium silicate and hexamethyldisilazane are added in the preparation process, so that the high-temperature stability of the mesoporous super-stable aluminum oxide is effectively improved, and the mesoporous super-stable aluminum oxide still has good specific surface area and pore volume under a hydrothermal condition. The mesoporous stable alumina is prepared by taking sodium metaaluminate and aluminum sulfate as main raw materials, and an organic solvent is not added as a template agent in the preparation process, so that volatilization of the organic solvent is effectively avoided, and the mesoporous stable alumina is green and environment-friendly.

The invention provides amino acid cleansing cream and a preparation method thereof. The preparation method comprises the following steps: heating and stirring raw materials of the amino acid cleansing cream to a temperature T1; wherein T1 ranges from 80 DEG C to 85 DEG C; cooling and stirring to a crystallization temperature T2, and continuously stirring until the paste is pearlescent, namely reaching a discharging temperature T3; heating and stirring to a temperature T4, keeping the temperature and stirring for 20-40 minutes, and cooling and stirring to a discharging temperature T3, so as to obtain the amino acid cleansing cream. Wherein T2-5 DEG C < T4 < T2 + 5 DEG C, preferably T2-3 DEG C < = T4 < = T2 + 3 DEG C. The preparation method is simple in process and easy to implement, and the prepared amino acid cleansing cream can keep a cream body stable for a long time and is fine, smooth and soft in appearance.

The invention discloses a polyamide / polyketone alloy material as well as a preparation method and application thereof. The polyamide / polyketone alloy material is prepared from the following raw materials in parts by weight: 10-84.95% of polyamide resin; 5 to 25% of polyketone resin; 0.01%-5% of a compatilizer 1; 0.01 to 5% of a compatilizer 2; 10 to 50% of glass fiber; 0.01%-1% of a nucleating agent A; 0.01%-1% of a nucleating agent B; 0.01 to 1% of an antioxidant; and 0-2% of other additives. The problem of compatibility of polyamide and polyketone is solved through the synergistic effect of the multi-component compatilizers in formula design, the improvement of the compatibility is beneficial to improving the mechanical property of the alloy material, and meanwhile, the difference of the cooling crystallization temperature and rate of polyamide and polyketone is improved through the compounded nucleating agent; the compatibility of the polyamide and the polyketone in the cooling crystallization process is further improved, and the improvement of the compatibility of the polyamide and the polyketone is beneficial to the improvement of the mechanical property of the alloy material. The mechanical property of the prepared polyamide / polyketone alloy material is greatly improved, and the preparation method is simple and suitable for industrial production and application.

The invention relates to a fluxing agent for gallium oxide crystal growth and a growth method. The fluxing agent for growth of the gallium oxide crystal comprises vanadium pentoxide or a mixture composed of vanadium pentoxide and boron oxide. The fluxing agent does not contain toxic and harmful components such as lead oxide and lead fluoride, gallium oxide crystals can grow at a moderate temperature, volatilization and decomposition reactions of gallium oxide during high-temperature growth are effectively inhibited, and component segregation of the crystals in the growth process is improved; the gallium oxide crystal has relatively low viscosity, is beneficial to solute transportation in a crystal growth process, and can effectively reduce or even eliminate inclusion defects in the gallium oxide crystal; the method has a wide crystallization temperature interval, can improve the stability of crystal growth, and is beneficial to obtaining large-size and high-quality gallium oxide crystals.

This thermoforming device, which performs thermoforming of a continuously supplied resin sheet to simultaneously mold two or more rows of containers in the feed direction of the resin sheet, has: protruding linear portions of a leading clamp forming thin-walled portions in a direction perpendicular to the feed direction between the two rows of the containers; and protruding linear portions of an upper mold, wherein the protruding linear portions have a cooling means and do not raise the temperatures of the thin-walled portions to a crystallization temperature during heat set thermoforming.

Stamp-forming a composite assembly includes applying a low-melt film on an interface surface of at least one spar, loading the spar onto at least one tooling segment such that the interface surface is exposed, and heating the tooling segment to a first temperature that is above a crystallization temperature of the low-melt film and below a melt temperature of a resin of the spar. A second low-melt film may be applied on a fiber-reinforced thermoplastic skin blank, and the skin blank is heated to a second temperature above a melt temperature of a resin of the skin blank. The skin blank is then draped around the tooling segment such that at least some of any second low-melt film contacts the low-melt film on the interface surface of the spar. The stamp press is then closed to co-consolidate the skin blank and the spar, thereby stamp-forming the composite assembly.

The invention discloses a microcapsule phase change cement material, which is prepared by compounding a microcapsule with phase change performance and a cement matrix, the microcapsule is of a core-shell structure, the raw materials of the shell are melamine, urea and formaldehyde, the raw material of the core material is octadecane, and Tween 80 and lauryl sodium sulfate are used as emulsifiers. The preparation method comprises the following steps: 1, preparing an MUF resin prepolymer; 2, preparing a core material O / W emulsion; 3, polymerization reaction of the microcapsules; and 4, preparing the microcapsule phase change cement material. When the composite material is used as a cement-based composite material, the melting temperature ranges from 25 DEG C to 29 DEG C, the crystallization temperature ranges from 19 DEG C to 23 DEG C, the melting enthalpy ranges from 13.47 J / g to 29.78 J / g when the mixing amount is 10%-30%, the crystallization enthalpy ranges from 12.94 J / g to 28.41 J / g, and the coating efficiency is 67.5%. The initial decomposition temperature ranges from 386.13 DEG C to 390.96 DEG C, the finishing temperature ranges from 399.49 DEG C to 406.42 DEG C, and the maximum degradation temperature ranges from 438.78 DEG C to 443.64 DEG C; the heat conductivity coefficient is 0.3216 to 0.3949, and is improved by 39.4 percent compared with that of standard cement.

The invention provides a preparation method of an SSZ-13 molecular sieve, and relates to the technical field of waste resource utilization and molecular sieve synthesis. The method comprises the following steps: mixing a template agent, an alkali source, water, industrial perlite waste and a silicon source to obtain a mixture; performing hydrothermal crystallization on the mixture to obtain an SSZ-13 molecular sieve; the temperature of the hydrothermal crystallization is 160 to 170 DEG C. According to the method, the industrial perlite waste is used as a raw material to replace a pure chemical reagent to synthesize the zeolite molecular sieve, so that the problems of treatment and storage of the industrial perlite waste can be solved, meanwhile, the production cost is reduced, and the SSZ-13 molecular sieve product with high additional value is obtained; according to the method, a high crystallization temperature is adopted, effective utilization of silicon and aluminum sources in the industrial perlite waste is promoted, the SSZ-13 molecular sieve with relatively high crystallinity and purity can be hydrothermally synthesized by a one-step method on the premise of not carrying out activation pretreatment, the operation steps are simplified, and the energy is greatly saved.

The invention discloses preparation of a lamellar Ti-MWW titanium silicalite molecular sieve and application of the lamellar Ti-MWW titanium silicalite molecular sieve in epoxidation reaction, and belongs to the technical field of synthesis of inorganic chemicals. According to the method, polycyclic aliphatic amines are added in the Ti-MWW molecular sieve synthesis process, the crystallization temperature is reduced in the initial crystallization stage of the molecular sieve to delay the growth speed of the C-axis of the molecular sieve, and the thin-layer Ti-MWW with the shorter C-axis is obtained, so that the diffusion performance of the Ti-MWW molecular sieve is greatly improved, the diffusion rate of reactant molecules in pore channels is increased, and the performance of the Ti-MWW molecular sieve is improved. Therefore, the catalytic performance of the molecular sieve is greatly improved, and the molecular sieve is suitable for catalyzing liquid-phase epoxidation reactions of propylene, butylene, hexene, cyclohexene and octene and the like.

The invention discloses a preparation method of a neodymium-yttrium-iron-boron magnet with core-shell heterostructure crystal grains. The method comprises the following steps: preparing neodymium-yttrium-iron-boron rapid-quenching amorphous strips with different yttrium contents through a melting rapid-quenching technology; carrying out crystallization annealing on the amorphous rapid quenching belt at different temperatures, and preparing powder particles with the particle size of 2-5 microns through hydrogen demolishing and jet milling; and the neodymium-yttrium-iron-boron magnet with the core-shell heterostructure is prepared through high-temperature vacuum sintering after orientation forming and cold isostatic pressing of the neodymium-yttrium-iron-boron magnet in a magnetic field. According to the method, dynamic adjustment of distribution of yttrium in a crystal grain core-shell area is achieved by controlling the crystallization temperature of an amorphous rapid quenching zone, and therefore the coercive force of the magnet is improved.

The invention discloses a low-temperature phase change energy storage material and a preparation method thereof, and relates to the technical field of cold storage materials. The provided organic phase-change material is formed by jointly matching alkane and fatty alcohol, the melting temperature of the organic phase-change material is 0-10 DEG C, the crystallization temperature is-5-5 DEG C, and the melting temperature and the crystallization temperature can be adjusted according to requirements. The material has high latent heat of phase change, and can be efficiently used in scenes of cold chain transportation, refrigeration house energy conservation and the like. The material is non-toxic and harmless, has stable cycle performance, and effectively overcomes the defects of poor cycle performance, easy phase separation, large supercooling degree and the like of an inorganic material. The material is applied to cold storage energy conservation or cold chain transportation, and the effects of energy conservation, environmental protection and electric charge saving can be achieved by utilizing the valley electricity energy storage principle.

The present invention discloses a potassium-doped tungsten rod for high-flexibility tungsten wire ropes and its manufacturing method, belonging to the technical field of powders for metal additive manufacturing, which includes the following steps: (1) material selection - (2) pre-reduction - (3) vacuum spray doping - (4) reduction - (5) batch pickling - (6) mixing - (7) hard film cold isostatic pressing - (8) low-temperature impurity removal - (9) vertical melting pre-sintering - (10) intermediate-frequency sintering, finally obtaining a potassium-doped tungsten rod. Compared with the prior art, the present invention uses specially made potassium-doped tungsten powder with high activity and narrow particle size range to produce tungsten rods. Through the regulation of the narrow particle size range, during the sintering of the combination of vertical melting and intermediate frequency, the potassium-doped tungsten billet obtains stable and micro-nano-level initial crystallization; and after being processed into tungsten wire, the finished product rate reaches 88% - 90%, the qualified rate ≥ 95%, the tensile strength ≥ 2250 N / mm<supgt;2< / supgt;, the high-temperature recrystallization temperature is 1850 °C - 2380 °C, the high-temperature sag value of the 0.39 mm specification ≤ 1.5 mm, the aspect ratio ≥ 15, and the service life is extended.

The present invention addresses the problem of providing polypropylene-based foamed resin particles which contain a recycled polypropylene-based resin and with which it is possible to provide a polypropylene-based foamed resin molded body having excellent internal fusion properties. The polypropylene-based foamed resin particles contain a base material resin containing a non-recycled polypropylene-based resin and a specific amount of a recycled material that contains a recycled polypropylene-based resin. The crystallization temperature of the recycled material is higher than the crystallization temperature of the non-recycled polypropylene-based resin.

In order to obtain an electret melt blown nonwoven fabric having flexibility and high tensile elongation without performing a special post-processing treatment or using a special additive, the electret melt blown nonwoven fabric comprising polyolefin-based resin fibers is provided, the electret melt blown nonwoven fabric having a crystallization temperature of 80° C. or higher and 130° C. or lower and a heat quantity ΔHm of 3.0 J / g or higher and 20.0 J / g or lower at the time of the first temperature rise in the cycle of DSC.

The present invention belongs to the technical field of catalyst carrier materials, and specifically relates to a method for preparing mesoporous ultra-stable alumina. The present invention adopts a double aluminum method to prepare pseudo-boehmite, obtains alumina powder after calcination, and prepares a layer of fibrous pseudo-boehmite in the pore structure of the alumina powder. The pore structure and specific surface area of the mesoporous ultra-stable alumina are controlled by controlling the crystallization pH value and crystallization temperature during the reaction process, and sodium silicate and hexamethyldisilazane are added during the preparation process, which effectively improves the high-temperature stability of the mesoporous ultra-stable alumina, so that it still has good specific surface area and pore volume under hydrothermal conditions. The present invention uses sodium metaaluminate and aluminum sulfate as the main raw materials to prepare mesoporous stable alumina. No organic solvent is added as a template during the preparation process, which effectively avoids the volatilization of the organic solvent and is green and environmentally friendly.

The invention relates to the technical field of formaldehyde copolymer production, and discloses a trioxymethylene static crystallization separation method which comprises the following steps: S1, cooling crystallization: the crystallization temperature is 25-30 DEG C, and the crystallization time is 3-4 hours; s2, discharging mother liquor; s3, sweating, wherein the sweating temperature is 50-55 DEG C, and the sweating time is 2-2.5 h; and S4, melting to obtain a high-purity product. According to the invention, the characteristic that the solubility of trioxymethylene is reduced along with temperature reduction is utilized, and separation and purification are realized through temperature gradient regulation and control. The content of trioxymethylene in the prepared finished product reaches 94-96% and is higher than that in the prior art by 90-92%, the formaldehyde content is only 0.1-0.2%, and the impurity content is lower.

The invention relates to the technical field of composite adsorption material preparation, and discloses a salt lake lithium extraction titanium system composite adsorption resin preparation technology, which comprises: placing a macroporous organic resin matrix loaded with a titanium lithium source and maintaining a solvent saturation state in a closed reaction kettle, and carrying out a reaction under an inert gas and initial pressure atmosphere, according to the preparation method disclosed by the invention, the problem that a traditional powdery ion sieve is easy to break and lose is solved by utilizing the anti-wear characteristic of an organic resin framework; and meanwhile, an in-situ composite interface realized by the process inhibits pulverization attenuation of active components in circulation, and ensures long service life and structural integrity of the material.

The invention discloses a low-temperature tempering method for improving the performance of bulletproof steel, which comprises the following steps: heating at the temperature of 1250 + / -15 DEG C to reach a complete austenitizing temperature, so that the slab structure is completely austenitized; the finish rolling temperature of laboratory hot rolling is 900 + / -15 DEG C, it is guaranteed that finish rolling is conducted in a completely non-recrystallization temperature area, recrystallization growth of austenite is avoided, crystal grains are lengthened and fragmented, and then uniform and fine austenite crystal grains are obtained; and the heat treatment quenching temperature is 870 + / -10 DEG C, heat preservation is conducted for 20-40 min, the tempering temperature is 150-220 DEG C, heat preservation is conducted for 60-80 min, and finally the low-temperature tempered martensite structure is obtained. According to the low-temperature tempering method for improving the performance of the bulletproof steel, the quenching and low-temperature tempering heat treatment technology is adopted, so that the steel obtains a low-temperature tempered martensite structure and good obdurability cooperation, and it is guaranteed that the best bulletproof steel performance is obtained.

Disclosed in the present invention is a preparation method for an anisotropic Nd2Fe14B / α-Fe bulk nanocrystalline composite permanent magnet material. The preparation method comprises the following steps: preparing a master alloy; crushing the master alloy into bulks, and, by means of a melt rapid quenching method, preparing amorphous ribbons; grinding the amorphous ribbons to obtain amorphous powder; cold-pressing the powder into bulks; and placing the bulks into a stainless steel mold, and heating and then rolling same, the stainless steel mold being of a plate-shaped structure, and a chamber for accommodating the bulks being formed in the stainless steel mold along the thickness direction thereof. The present invention presses the NdFeB amorphous powder into bulks, embeds same in the stainless steel mold, and performs rolling at a temperature below a crystallization temperature, so as to achieve high-temperature amorphous material crystallization.

A method for preparing a polybutene-1 composition with an elevated crystallization temperature, comprising blending as components A) 99.5-99.9% by weight, relative to the total weight of A)+B), of a butene-1 homopolymer, said butene-1 polymer being brought into or maintained in the molten state during the blending step, with B) 0.1-0.5% by weight, relative to the total weight of A)+B), of one or more alkanoyl hydrazines of specific formulas, the polybutene-1 composition thus obtained having a crystallization temperature T satisfying the following relationship: c C has. [0010] JPEG2024542582000029.jpg4092 Here, T c A is the crystallization temperature of butene-1 polymer A).

A method and apparatus for producing urea ammonium sulfate granules. In a first fluidized bed, a first spraying liquid is sprayed, the first spraying liquid comprising a urea melt and an aqueous ammonium sulfate solution, for example, a (near) eutectic mixture. The bed temperature is lower than the crystallization temperature of the sprayed mixture. In a next compartment, the granules are fluidized to form a second fluidized bed. A second spraying liquid comprising a urea melt is sprayed into the second fluidized bed, the second fluidized bed having a bed temperature higher than the bed temperature of the first fluidized bed and lower than the crystallization temperature of the sprayed second spraying liquid.

This invention discloses a method for preparing crystalline aluminum phosphate from aluminum polishing waste liquid, comprising the following steps: Step S1. Adding water and alkali to the aluminum polishing waste liquid, adjusting the pH to 2-5, to obtain a mixed solution; Step S2. Taking the mixed solution obtained in Step S1, filtering, to obtain an amorphous precipitate; Step S3. Taking the precipitate from Step S2, washing, to obtain a washed precipitate; Step S4. Adding water to the washed precipitate from Step S3 and transferring it to a hydrothermal reactor for crystallization, to obtain crude aluminum phosphate; Step S5. Taking the crude aluminum phosphate from Step S4, filtering, washing, and drying, to obtain crystalline aluminum phosphate; wherein, in Step S4, the crystallization temperature is 160-210℃, and the crystallization time is not less than 3 hours. This method is simple, easy to operate, and the reaction conditions are easy to control. It not only solves the environmental problems encountered in the chemical polishing process of aluminum materials, but also improves the industrial value of aluminum polishing waste liquid.