91results about How to "Improved particle size distribution" patented technology

The invention relates to the technical field of battery materials, in particular to a graphite negative electrode material and a preparation method and application thereof. The graphite negative electrode material comprises graphite particles, the average length La of the graphite particles in the alpha-axis direction of microcrystals is larger than or equal to 40 nm, the average thickness Lc of the graphite particles in the c-axis direction of the microcrystals is larger than or equal to 25 nm, and the interlayer spacing d002 ranges from 0.336 nm to 0.338 nm, and the number parameter of the microcrystals contained in each single graphite particle is defined as N = D503 / (La2 * Lc); d50 is the median particle size of the graphite particles, the unit is [mu] m, and the numerical value of N is more than 0 and less than or equal to 0.04. The graphite negative electrode material disclosed by the embodiment of the invention comprises the graphite particles with stable microcrystalline structure, large microcrystalline size and large interlayer spacing, so that the expansion and stress distribution uniformity of the negative electrode material in the circulation process is improved, the diffusion of ions in the graphite particles is facilitated, the consumption of active lithium is reduced, and the service life of the negative electrode material is prolonged. And the dynamic and super-long cycle stability of the graphite negative electrode material is improved.

The invention discloses special cement for a wind power generation concrete tower and a preparation method and belongs to the technical field of cement. The brick comprises the following components in parts by mass: 80-85 parts of clinker, 3-5 parts of gypsum, 3-4 parts of stones, 8-12 parts of mineral powder and a grinding aid, the content of tetra calcium aluminoferrite in the clinker is greater than or equal to 14%, and the alkali content is 0.45-0.55%; comprising the following steps: (1) adding clinker, gypsum and stones into a roller press, and extruding to obtain a component A; (2) selecting the component A by a powder concentrator, and mixing the selected component A with a grinding aid to obtain a component B; and (3) uniformly mixing the mineral powder and the ground component B to obtain the special cement for the wind power generation concrete tower. The prepared special cement for the wind power generation concrete tower has relatively high compressive strength; the low-alkali clinker is adopted, so that the low-alkali clinker has high adaptability, and the content of tetra calcium aluminoferrite in the clinker is greater than or equal to 14%, so that the low-alkali clinker has relatively high breaking strength; the proportion of the clinker in the special cement for the wind power generation concrete tower is high, and the proportion of other auxiliary materials is low, so that the standard consistency water consumption of the cement can be effectively reduced.

The invention relates to the technical field of concrete materials, and particularly discloses a composite mineral admixture, a preparation method thereof and concrete. The preparation method of the composite mineral admixture comprises the following steps: mixing and modifying dolomite powder, gypsum and calcium hydroxide to obtain pre-modified dolomite powder; then adding hexadecyl trimethyl ammonium chloride and octylphenol polyoxyethylene ether to obtain modified dolomite powder; and adding nickel slag, metakaolin, desulfurized fly ash and a grinding aid, and grinding to obtain the composite mineral admixture. The concrete prepared from the composite mineral admixture is excellent in compressive strength, shrinkage resistance, permeation resistance and the like, and the strength and durability of the concrete can be remarkably improved.

The invention relates to the technical field of cement production and manufacturing, aims at solving the problems that an existing grinding system is single in function and cannot have multiple cement grinding processes at the same time, and provides a composite multi-process cement grinding system and process and a cement production method. Wherein the composite multi-process cement grinding system comprises a roller press grinding system and a ball mill grinding system, and the composite multi-process cement grinding process comprises three grinding processes, namely a combined grinding process, a semi-final grinding process and a final grinding process; the cement production method comprises the following steps: separately grinding clinker and a mixed material by using two sets of cement grinding systems, and then mixing by using a mixing system to obtain a finished product. According to the invention, the limitation of a single grinding system is broken through, the operability of the system is improved through an ingenious switching means, and the advantages and functions of production through one system and coexistence of multiple technological processes are realized.

The preparation method comprises the following steps: selecting an abrasive material base material, mixing the abrasive material base material with a silane coupling agent for chemical modification, coating the surface with a modified abrasive material with a functional layer, adding the modified abrasive material into a stirring container, and dispersing to obtain the rough polishing liquid applied to the diamond substrate. An oxidizing agent and a dispersing agent are added into the abrasive dispersion liquid to be stirred to form a polishing solution, the particle size distribution condition of the modified abrasive in the polishing solution is monitored in real time through an online particle size analyzer, and the ultrasonic power and the treatment time are automatically adjusted; adding a pH regulator into the polishing solution by adopting a step-by-step titration method, and adjusting the pH value to 6-9; the polishing solution is filtered through a micro-filtration membrane, undispersed particles and impurities are removed, and a polishing solution finished product is obtained; through the chemical modification and ultrasonic-assisted technology and the real-time monitoring and automatic adjusting process, the dispersity of the grinding material and the uniformity of the polishing solution are remarkably improved, and the particle size distribution of the grinding material is optimized, so that the high-quality polishing solution is obtained.

The invention discloses coal gasification slag-based self-foaming lightweight concrete and a preparation method thereof, and relates to the field of comprehensive utilization of lightweight foam concrete and solid wastes. The coal gasification slag-based self-foaming lightweight concrete is prepared from the following components in parts by weight: 50 to 60 parts of coal gasification fine slag, 20 to 30 parts of waste incineration bottom ash, 10 to 30 parts of composite admixture, 5 to 20 parts of composite exciting agent, 20 to 40 parts of fine aggregate, 40 to 60 parts of water, 0.3 to 0.5 part of sodium lactate, 0.3 to 0.5 part of water reducing agent, 0.3 to 0.7 part of cellulose ether and 0.3 to 0.5 part of redispersible latex powder. The invention has the advantages of low manufacturing cost, small environmental pollution, simple process flow, multiple curing modes and excellent performance in various aspects, can replace the traditional foam concrete, can effectively reduce the use of cement-based cementing materials, and promotes the recycling and large-scale utilization of solid waste materials.

The invention belongs to the technical field of ceramic production assistants, and particularly relates to a building ceramic slurry dispersion-enhanced admixture as well as a preparation method and application thereof. The invention discloses a ceramic slurry dispersion-enhancement type additive. The ceramic additive is prepared from the following raw materials: a modified silicate material, a carboxylic acid grafted ester amine copolymer, modified polymethacrylate and a charge shielding agent. When the ceramic slurry dispersion-enhanced admixture is applied to ball-milling dispersion and sintering links in ceramic production, the dispersion performance of ceramic slurry can be further improved, the water demand in the ball-milling process and the energy consumption in the subsequent sintering process can be reduced, the strength of green bodies can be improved, the subsequent processing stability is facilitated, the rejection rate is reduced, and the production cost is reduced. The ceramic production efficiency is improved.

The invention provides a foam surface particle stacking strength determination method and a foam stabilizing particle size distribution optimization method. The foam surface particle stacking strength determination method comprises the following steps: performing particle construction according to particle size distribution of target surface particles, uniformly distributing the constructed particles in a gridding target area at an initial moment, and endowing each constructed particle with an initial speed; repulsive force, attractive force, friction force, radial force Brown force and stress generated by the flow field action borne by each particle and the liquid phase volume fraction of each grid are determined; further determining the flow field velocity of each grid; further determining the resultant force, the dragging force and the lifting force of the gravity and the buoyancy borne by each particle; further determining the speed and the position of the particles in the next time step length; the steps are repeated until the simulation time requirement is met, and then the mechanical strength borne by the particle system is determined based on the repulsive force, the attraction force, the friction force, the radial force Brown force, the resultant force of the gravity and the buoyancy force, the dragging force and the lifting force borne by the particles.

The invention discloses low-shrinkage ultra-high performance concrete and a preparation method thereof, and belongs to the technical field of concrete. The shrinkage ultra-high performance concrete is prepared from the following components in parts by mass: 100 parts of cement, 25 to 100 parts of mineral admixture, 2.1 to 3.5 parts of high-performance water reducing agent, 5 to 10 parts of expanding agent, 0.12 to 0.2 part of thickening time control agent, 2.5 to 4 parts of reinforcing agent, 100 to 160 parts of sand, 1.5 to 3 parts of fiber and 18 to 30 parts of water, the mineral admixture is a product obtained by cofiring the high-aluminum solid waste and CaO at 800-900 DEG C and then carrying out shock cooling treatment. The low-shrinkage ultra-high-performance concrete has excellent compressive strength and tensile property, meanwhile, a large proportion of high-aluminum solid waste replaces part of cement and all silica fume in existing ultra-high-performance concrete, large chemical shrinkage caused by the cement and the silica fume in the hydration reaction process is greatly reduced, and the volume stability of a matrix is improved. A large amount of solid hazardous waste with high aluminum oxide content is used, so that the production and construction cost is reduced, and meanwhile, a method for comprehensively utilizing solid hazardous waste resources is provided.

The invention discloses a high-color-fastness structural color film and a preparation method thereof, and belongs to the technical field of structural color films, and the preparation method comprises the following steps: S1, adding modified nano colloidal microspheres and carbon black into absolute ethyl alcohol, and carrying out ultrasonic dispersion for 40 min to obtain a microsphere dispersion liquid; s2, uniformly spreading the microsphere dispersion liquid on a smooth and flat polyfluortetraethylene plate, and drying at 40-45 DEG C to obtain a modified microglobulin photonic crystal template; and S3, injecting the modified polyurethane precursor solution into the modified microglobulin stone photonic crystal template, vacuumizing, defoaming, and curing at 80 DEG C to obtain the high-color-fastness structural membrane. According to the invention, the modified nano colloidal microspheres and the carbon black are taken as assembly elements of the photonic crystal, so that the stability of the structural color film is improved, and meanwhile, under the synergistic effect of the modified polyurethane precursor solution, cracks can be effectively prevented, and the photonic crystal structure is prevented from being damaged, so that the color fastness and durability of the structural color film are improved.

The invention relates to the technical field of sewage treatment, in particular to an aerobic granular sludge rapid culture method which comprises the following steps: S1, dewatering excess sludge of a municipal sewage treatment plant; s2, adding activated carbon and stirring to form a mixture A; s3, adding a pre-prepared nutrient solution into the mixture A; s4, inducing the sludge to be granulated, so that the sludge gradually forms a granular structure; s5, regularly adding a solution containing Ca < 2 + > and Mg < 2 + > into the preliminary particle structure; s6, adjusting the hydraulic retention time in the reactor to form a mixture of granular sludge and suspended sludge; s7, collecting granular sludge meeting the particle size requirement; s8, carrying out dehydration and drying treatment on the collected granular sludge; according to the invention, the overall efficiency of sewage treatment is improved by optimizing the sludge granulation process, accurately controlling various parameters, simplifying the operation steps, shortening the granulation time and enhancing the stability of sludge particles.

The invention provides fiber-reinforced modified silicon dioxide aerogel as well as a preparation method and application thereof, and relates to the technical field of aerogel. Specifically, the method comprises the following steps: sequentially carrying out acid treatment and surface modification treatment on inorganic fibers to obtain hydroxylated modified fibers; mixing silica sol, hydroxylated modified fibers and the modified emulsion, and sequentially carrying out vacuum impregnation treatment and gelation reaction to obtain modified silica gel; wherein the modified emulsion comprises acrylic acid, an acrylate compound and persulfate; and aging the modified silica gel, and carrying out replacement treatment and drying treatment by using an alcoholic solution to obtain the fiber-reinforced modified silica aerogel. By optimizing the preparation method, the bonding property of the silica aerogel and other materials is remarkably improved, the mechanical strength, the heat preservation performance and the heat stability of the silica aerogel are improved, the aerogel heat insulation coating is further provided, and the mechanical property, the weather resistance and the heat insulation performance of the silica aerogel coating can be remarkably improved.

The invention belongs to the technical field of cement grinding aids, and particularly relates to an efficient cement grinding aid and a preparation method thereof.The efficient cement grinding aid is prepared from, by weight, 15%-30% of polyhydric alcohol compounds, 10%-15% of organic acid salt, 12%-20% of a surfactant, 10%-15% of a reinforcing agent and 0.3%-5% of a defoaming agent; the invention further discloses a preparation method of the efficient cement grinding aid. The preparation method comprises the following preparation steps: S1, raw material pretreatment; s2, mixing and dispersing; s3, preparing solid raw material spherical particles; s4, dissolving; s5, adding nano silicon dioxide and modified starch; and S6, post-processing. The cement grinding aid disclosed by the invention can be used for refining cement particles and optimizing particle composition, so that the specific surface area of cement is increased, the problems of caking of raw materials and non-uniform local concentration are effectively avoided, and the mixing effect is improved.

The invention belongs to the technical field of nano materials, and particularly relates to a liquid-phase preparation method of nanoscale superfine copper powder. The nucleation growth process of the copper powder is controlled by adding a reducing agent in a segmented mode, a certain amount of dispersing agent is added in the reduction process to guarantee good dispersion of copper powder particles in a liquid phase, the situation that the nucleation number of the copper powder is reduced and the particle size is increased due to agglomeration of the copper powder in the liquid phase nucleation process is avoided, and the large-size copper powder is continuously dissolved and then separated out through reduction in each segment. And the particle size distribution is further optimized, and finally the nanoscale superfine copper powder which is good in dispersion, narrow in particle size distribution range and good in circularity is obtained.

The invention belongs to the field of sludge utilization, and relates to a method for preparing roadbed filler through solidification and modification of water supply plant sludge. Comprising the following main steps: mud detection: aiming at dewatered sludge of a water supply plant, carrying out mud index detection, analyzing mud characteristics of the sludge, and evaluating feasibility of preparing roadbed filler from the sludge and key of a curing modification technology; sludge conditioning: uniformly mixing dewatered sludge of a water supply plant with a hydration conditioner, carrying out material covering and stacking, and then digging, airing and crushing for later use; curing and modifying: sequentially adding a gel curing agent, high polymer fibers and a resin water-retaining agent into the conditioned sludge, and uniformly mixing to obtain roadbed filler; and filler detection: carrying out environmental index detection and indoor soil test on roadbed filler, and evaluating whether the mechanical properties of the sludge curing modified filler meet the design requirements or not. The method can realize water supply plant sludge solidification modification, improve the sludge bearing ratio and shear strength, reduce the environmental risk of using heavy metals and pathogenic bacteria in sludge building materials, and is beneficial to solving the double dilemma of sludge outlet shortage and road base material shortage in urban development.

The invention relates to the technical field of acrylate emulsion, in particular to high-performance acrylate emulsion and a preparation method thereof. Comprising the following components in parts by weight: 45 to 50 parts of a main monomer, 35 to 40 parts of a soft monomer, 8 to 12 parts of a functional monomer, 2 to 4 parts of a carboxyl functional monomer, 0.2 to 0.4 part of a chain transfer agent, 1.4 to 2.1 parts of a compound emulsifier, 0.6 to 1.0 part of a redox initiation system, 0.5 to 0.8 part of a cross-linking agent and 0.5 to 0.8 part of a pH regulator, and the balance to 100 parts by weight of water; wherein the functional monomer is used for improving the adhesive force and weather resistance of the emulsion to a base material; the chain transfer agent is used for controlling molecular weight distribution and particle size distribution of the emulsion; the redox initiation system is used for improving the monomer conversion rate; the cross-linking agent is used for improving the water resistance and mechanical strength of the emulsion after film formation.

The invention relates to the technical field of waste sand crushing devices, in particular to a multistage crushing waste sand crushing device which comprises a base and a discharging assembly, and the discharging assembly is assembled to drive a conical block to rotate through a first motor to shake waste sand; the screening assembly is assembled to screen the waste sand by changing the vertical position of a base and changing the inclination angle of a screening plate through the power of a first motor; the coarse crushing assembly is assembled to drive a connecting shaft to rotate through a motor II so as to coarsely crush the waste sand; the material returning assembly is located on one side of the coarse crushing assembly, and the material returning assembly is assembled to drive a circular shaft to rotate through power of a second motor, so that a feeding belt conveys the waste sand screened out by the screening assembly back to the coarse crushing assembly; according to the waste sand coarse crushing and fine crushing device, the discharging assembly, the screening assembly, the coarse crushing assembly, the material returning assembly and the fine crushing assembly are adopted, coarse crushing and fine crushing can be conducted on the waste sand, and meanwhile products obtained after two times of crushing can be screened.

The invention discloses a cementing material capable of improving toughness, which comprises the following components in percentage by mass: 9.2-16.2 wt% of a high-activity auxiliary cementing material A, 49.4-53.5 wt% of a high-performance cementing material B and 30.3-41.4 wt% of a high-toughness auxiliary cementing material C. The high-activity auxiliary cementing material A is one or more of silica fume, slag or high-calcium fly ash; the high-performance cementing material B is high-iron-phase high-belite cement clinker, and the high-toughness auxiliary cementing material C is modified rubber powder. From the perspective of the cement clinker, the high-performance cementing material with high strength and large bending-compression ratio is prepared by adjusting the mineral composition of the cement clinker, optimizing the grain composition of the cement, adding the high-toughness auxiliary cementing material and the like, so that the problem of high brittleness of the cement-based material is fundamentally relieved.

The invention provides a method for preparing a lithium iron manganese phosphate composite positive electrode material based on a sol-gel method, and belongs to the technical field of lithium ion battery positive electrode materials. The method comprises the following steps: respectively preheating raw material solutions to a preset temperature; the method comprises the following steps: uniformly mixing a manganese salt solution with a complexing agent solution, adding a ferrite solution, a phosphorus-containing compound solution and a lithium salt solution, and dropwise adding concentrated ammonia water to obtain a reaction solution; placing the reaction solution in an ultrasonic-microwave combined reaction system, and performing ultrasonic treatment, ultrasonic-microwave cooperative treatment and microwave treatment to obtain xerogel; performing thermal decomposition treatment, adding a carbon source into a cooled product, and performing grinding and demagnetizing treatment to obtain precursor powder; and carrying out microwave gradient high-temperature sintering on the precursor powder in a microwave reaction system under a protective atmosphere condition, and cooling to obtain the lithium iron manganese phosphate composite positive electrode material. According to the invention, the preparation period is shortened, the uniformity of the material is effectively improved, and the prepared positive electrode material shows excellent dispersity, electronic conductivity and stability.

The invention provides a ternary positive electrode material precursor, a ternary positive electrode material and a preparation method thereof. The preparation method of the ternary positive electrode material precursor comprises the following steps: (1) coprecipitation reaction: carrying out coprecipitation reaction by adopting a micro-channel reactor to obtain a reaction solution containing the ternary positive electrode material precursor; (2) aging: aging the reaction liquid obtained in the step (1), and before aging, adjusting the pH value of the reaction liquid to 9.5-12.5, or adding an auxiliary agent into the reaction liquid; and (3) post-treatment: carrying out post-treatment on the ternary positive electrode material precursor aged in the step (2), wherein the post-treatment comprises washing, dehydrating, drying and crushing. According to the method provided by the invention, the problems that the particle morphology is amorphous, the particle size is difficult to control and the tap density is low due to random agglomeration of primary particles of the positive electrode material precursor prepared by the microchannel reactor can be solved.

This invention belongs to the field of industrial solid waste resource utilization technology, and relates to a circulating fluidized bed ash-based cementitious material for road base courses and its preparation method. The raw materials for the road base course cementitious material are composed of the following mass parts: 29-43 parts of circulating fluidized bed ash, 16-27 parts of ground blast furnace slag, 3-6 parts of silica fume, 7-15 parts of P.O42.5 silicate cement, 0.1-0.4 parts of activator, and 27-30 parts of water. The circulating fluidized bed ash is prepared by mixing circulating fluidized bed fly ash and slag in a mass ratio of (2-5):(5-10). This invention effectively alleviates the problems of fast setting time and shrinkage cracking of traditional road base course cementitious materials by utilizing the characteristics of micro-expansion and long hydration time of circulating fluidized bed ash. The advantage of this invention is that it promotes the large-scale utilization of circulating fluidized bed ash and contributes to carbon emission reduction in the road sector.

This invention discloses an integrated molding method for metallic chromium powder and additives, comprising: crushing chromite ore and mixing it with aluminum powder, adding additives, mixing and pressing the mixture into a compact, and then feeding it into an electric arc furnace for an electrothermal reaction; after the reaction, separating the slag and metallic chromium; crushing the prepared metallic chromium, adding a binder to the crushed metallic chromium powder, mixing, and then performing high-temperature sintering treatment to obtain high-temperature sintered metallic chromium powder, which is then cleaned and dried; pressing the dried metallic chromium powder into blocks to obtain the finished metallic chromium product. This invention addresses the issue of high carbon content in existing electrothermal methods for preparing metallic chromium by adding chromium trioxide, tin powder, or highly active tin powder to chromite ore. The reaction of chromium trioxide with carbon removes impurities, while the reaction of tin powder with sulfur generates volatile tin sulfide, thereby removing sulfur impurities from the metallic chromium and improving the purity of the finished metallic chromium product.

The invention relates to a flame retardant and a preparation method and application thereof, and relates to the technical field of flame retardants, the preparation method of the flame retardant comprises the following steps: adding hypophosphite, polyethylene glycol and a silane coupling agent into water, and stirring to obtain a first mixture; performing pulsed electric field treatment on the first mixture to obtain a second mixture; and filtering the second mixture, and washing and drying the obtained solid product to obtain the flame retardant. According to the invention, a material system composed of hypophosphite, polyethylene glycol and a silane coupling agent is modified by adopting a pulsed electric field technology, so that the physical properties such as particle size distribution and particle regularity of hypophosphite are remarkably improved, and the compatibility and flame-retardant effect of hypophosphite and a high polymer material are also improved; the defects of the existing hypophosphite flame retardant are overcome.

The invention relates to the technical field of pharmaceutical preparations, discloses a preparation method of pediatric paracetamol and amantadine hydrochloride granules, and aims to improve the stability and uniformity of medicines. The method comprises the following steps: preparing an adhesive, preparing a pre-mixture, carrying out wet granulation, drying wet granules, and finally finishing the granules. Through a multi-stage premixing and optimized wet granulation process, the uniform distribution of medicine components is ensured; segmental temperature control based on dissolution rate is adopted in the drying process, so that the drying time is effectively shortened, and particle surface hardening is prevented; according to the method, the dissolution performance and bioavailability of the medicine are improved, and the production efficiency and the stability of the product quality are remarkably improved.

The bismuth nitrate pentahydrate cooling crystallization device comprises an L-shaped framework, a crystallization kettle is fixed to the outer wall of one side of the L-shaped framework, a kettle cover is connected to the top end of the crystallization kettle in a bolted mode, and a feeding structure used for introducing a bismuth nitrate saturated solution is installed on the outer wall of the side, away from the L-shaped framework, of the crystallization kettle; the constant-temperature circulator is mounted on the peripheral surface of the crystallization kettle, a supporting disc is fixed at one end in the crystallization kettle, and a double-layer cage type cooling crystallization assembly for forming bismuth nitrate pentahydrate crystals is mounted at the bottom end of the supporting disc. The introduction time of circulating cooling water in the double-layer cage type cooling crystallization assembly is controlled, the growth process of the crystals is optimized, it is ensured that the bismuth nitrate pentahydrate crystals obtain ideal particle size distribution in the forming process, the purity and stability of products are improved through large and uniform crystal particles, and the production cost is reduced. And the problems of increased surface area, easy deliquescence and the like caused by too small crystals are also reduced.

The invention relates to the technical field of glass bead production, and discloses a method for preparing glass beads by mixing open-hearth liquid slag with blast furnace waste slag and continuous casting slag, which comprises the following steps: S1, raw material pretreatment: pretreating the open-hearth liquid slag, firstly filtering the open-hearth liquid slag to remove impurities, and then introducing into an electrode heating furnace to heat, the method comprises the following steps: S1, preparing raw materials, S2, preparing raw materials, S3, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S4, preparing raw materials, S5, collecting and screening glass beads, and S6, detecting products and controlling quality. By adding sodium carbonate and borax for fine adjustment of components and performing ingredient calculation and mixing through accurate component analysis, the components of the mixed liquid slag can be adjusted, and the viscosity, surface tension and solidification characteristics of the mixed liquid slag are changed, so that the particle size distribution after air quenching granulation is optimized, the state and performance of a precipitated phase after slag liquid solidification are improved, and the production quality of glass beads is ensured.

The invention provides a method and technology for preparing MHP through laterite-nickel ore hydrometallurgy crystallization control, and belongs to the technical field of laterite-nickel ore hydrometallurgy. The method comprises the steps that the number of multiple crystal nucleuses after a nucleation reaction is conducted on liquid obtained after iron and aluminum are removed is determined on the basis of nucleation reaction conditions; determining the average grain size of the plurality of crystal grains after the plurality of crystal nucleuses are subjected to primary growth on the basis of primary growth reaction conditions; and based on a Metropolis algorithm, the number of the crystal nucleuses and the average particle size, determining predicted particle size distribution of the agglomerated crystal grains after secondary agglomeration and growth of the plurality of crystal grains. According to the predicted particle size distribution result, the reaction conditions of the nucleation reaction and the primary growth reaction are adjusted, and the number of crystal nucleuses and the average particle size are controlled, so that the high-performance MHP product with better particle size distribution is obtained, and the method has a guiding effect on the crystallization process of MHP.

The invention discloses a zero-dimensional indium-based organic-inorganic hybrid perovskite material and a synthesis method thereof, and belongs to the technical field of photoelectric materials, the perovskite material has a general formula, R is one or more organic cations selected from methylamine, formamidine and cesium, and X is one or more halide ions selected from methylamine, formamidine and cesium; the invention further discloses a synthesis method of the material, the synthesis method comprises the steps of precursor solution preparation, coordination regulation and control, solvothermal reaction, product separation, surface modification, purification and drying, and the crystal structure and the surface chemical environment are precisely regulated and controlled through the synergistic effect of coordination regulation and surface passivation. The photoluminescence quantum yield of the material reaches 82% or above, and the material has excellent luminescence performance in a solution state, has ultrahigh environmental, water and thermal stability, and is lead-free, non-toxic and environment-friendly; the material can be widely applied to the photoelectric fields of light emitting diodes, X-ray scintillators, photocatalysis and the like, and the device performance is excellent.

The present invention relates to a material particle size optimization method, system, device and storage medium, the method comprising: establishing a discrete element simulation model of the material, calculating the compaction density of the material under different pressures, and obtaining the model parameters of the discrete element simulation model; using a particle swarm optimization method to correct the model parameters of the discrete element simulation model based on material measurement data; using a Bezier curve to represent the particle size distribution in parameter form; using a particle swarm optimization method, using the control point coordinates of the Bezier curve as the parameters to be optimized, to achieve particle size distribution optimization. The present invention optimizes the material particle size distribution by combining discrete element simulation with a particle swarm optimization algorithm, thereby reducing the cost and time of material development.

The invention relates to the technical field of building materials, in particular to solid waste wave-absorbing concrete aggregate, a preparation method and concrete.The solid waste wave-absorbing concrete aggregate is prepared from, by weight, 18%-22% of coal gangue, 4%-6% of lithium slag, 8%-12% of steel slag with the particle size ranging from 0 mm to 5 mm, 17%-23% of steel slag which is subjected to hydrophobic treatment and has the particle size ranging from 5 mm to 10 mm and 40%-50% of steel slag which is subjected to carbonization treatment and has the particle size ranging from 10 mm to 20 mm. According to the aggregate, the preparation method and the concrete, the problem of poor stability can be effectively solved, and the concrete is higher in strength and better in wave absorbing performance.