11results about How to "Orderly growth" patented technology

A water-reducing agent for coal-based solid waste concrete and its preparation method are disclosed. The water-reducing agent comprises 40-60 parts of a polycarboxylate-based main agent, 15-25 parts of a slump retainer, 10-20 parts of a crack-resistant reinforcing agent, 5-10 parts of a dispersing agent, 2-5 parts of a stabilizer, and 10-20 parts of deionized water. The slump retainer is a modified polyetheramine prepared by block copolymerization of ethylenediamine with ethylene oxide and propylene oxide; the crack-resistant reinforcing agent is a composite of nano-calcium carbonate and modified lignin sulfonate. This invention reduces the adsorption loss of the water-reducing agent by coal-based solid waste particles through the synergistic effect of the polycarboxylate-based main agent and the modified polyetheramine slump retainer, achieving a slump loss rate of ≤15% after 2 hours. The nano-calcium carbonate fills interfacial voids, and the modified lignin sulfonate alleviates hydration thermal stress, resulting in a lower 28-day drying shrinkage rate and higher crack resistance of the concrete. This invention solves the problems of poor adaptability, short slump retention time, and insufficient crack resistance of traditional water-reducing agents in high-volume coal-based solid waste concrete.

The invention relates to the technical field of rebaudioside M crystals, in particular to a preparation process for improving fluidity of rebaudioside M crystals, which comprises the following steps: (1) taking a rebaudioside M raw material, adding a first solvent, heating and stirring to obtain a phase I solution for later use; (2) taking a second solvent of which the density is greater than that of the phase I solution as a phase II solution; taking a third solvent of which the density is smaller than that of the phase II solution as a phase III solution; and (3) adding the phase III solution in the step (2) into the phase II solution, taking the phase I solution in the step (1), controlling the temperature, adding, standing at constant temperature in a closed state until white flaky crystals appear in the phase I solution and at the interface of the phase I solution, the phase II and the phase III mixed solution, separating, leaching, and drying to obtain the rebaudioside M crystal. By adopting the preparation process, the rebaudioside M crystal with high flowability and high dissolution rate can be obtained.

The utility model relates to the technical field of seeding machines, in particular to a clay land seeding machine which comprises a main body, and the side face of the main body is fixedly connected with a land piling and ridging assembly and a ditching and fertilizer spreading assembly. Fertilizer in the first fertilizer box and the second fertilizer box is directly discharged from the space between the depth limiting wheels and scattered on the ground, and then the seeding disc furrow opener is used for furrowing, so that the fertilizer can be drawn into a furrow, the fertilizer can be kept in the furrow, the soil absorption efficiency is improved, and the soil quality is improved. According to the invention, crops can fully absorb sufficient fertilizer, the expected growth effect is achieved, the range of the ridges can be controlled by using the stacking disc and the crushing fluted disc, the crops can grow under the specified ridges, the crops can grow orderly, the orderly ridges become loose soil piles, the soil is loose, the permeability is good, and the quality of the crops is improved. The air is sufficient, the heat preservation performance is improved, the soil heat is increased, crop growth is promoted, and the fertilizer and water retention capacity of soil is improved.

The invention relates to cyanide-free alkaline silver electroplating liquid for advanced packaging and application of the cyanide-free alkaline silver electroplating liquid to silver electroplating. An additive is a mixture of an o-benzoyl sulfonyl imide polyoxypropylene / vinyl ether propane sulfonate water solution and / or a beta-naphthyl sulfonyl imide polyoxypropylene / vinyl ether propane sulfonate water solution. The additive is matched with the silver salt, the complexing agent, the brightener and the pH regulator, a bright, fine, defect-free and spot-free silver plating layer can be obtained, the additive has the effect of reducing the internal stress of the silver plating layer, meanwhile, the additive has the characteristics of a surfactant, the surface tension between the plating layer and a substrate is reduced, and then the binding force between the plating layer and the substrate is enhanced. A cyanide-free system is safe and environment-friendly, and pollution is effectively reduced.

The application discloses a method for extracting alumina from industrial solid waste red mud. The method comprises the following steps: mixing the red mud with a composite additive composed of sodium carbonate, potassium sulfate and limestone, wet ball milling the mixture until the particle size of the mixture reaches D90≤74 μm, drying the obtained slurry until the water content is less than 5%, and sintering at 950-1050 ℃ to obtain sintered clinker; leaching and separating the sintered clinker in hot water at a liquid-solid ratio of 10:1-25:1 and at 65-95 ℃ to obtain an aluminum-containing filtrate; introducing CO2 into the filtrate to perform carbonization, and performing aging and solid-liquid separation to obtain aluminum hydroxide; and then performing washing, drying and calcination to obtain an alumina product. By introducing potassium sulfate as a fluxing agent, the transformation of inert aluminum mineral phases is promoted, the sintering temperature can be reduced by 50-100 ℃, the time can be shortened by 30-50%, the process energy consumption is low, the aluminum extraction efficiency is as high as 88% or more, and a brand-new path is provided for large-scale resource utilization of the red mud.

This application relates to the field of building materials, specifically disclosing a high-ductility basalt fiber concrete and its preparation method, comprising cementitious materials, fiber mixtures, water, and admixtures. The fiber mixture includes polyethylene fibers and modified basalt fibers. The modified basalt fibers are prepared by the following method: basalt fibers are soaked in a calcium solution, and carbonates are added dropwise under alkaline conditions for in-situ mineralization to generate nano-calcium carbonate whiskers. These whiskers are then deposited by electrophoresis in a first suspension and then in a second suspension to obtain modified basalt fibers. The preparation method includes the following steps: mixing the cementitious materials and the fiber mixture to obtain a preliminary mixture; mixing water and admixtures and adding the preliminary mixture; stirring to obtain high-ductility basalt fiber concrete. This application has the characteristics of improving the interfacial bonding strength between basalt fibers and the concrete matrix, resulting in a high-performance concrete material with better ductility and strength.

The present disclosure relates to the technical field of titanium dioxide production, and particularly relates to a calcination method of titanium dioxide and titanium dioxide. The calcination method comprises the following steps: step 1, after the metatitanic acid filter cake is treated with salt, washed and beaten, a first material is obtained; step 2, after the first material is heated to 300-600 DEG C in a calcination device, oxygen-rich gas with an oxygen concentration of 25-40% is introduced to obtain a second material; step 3, after the second material is heated to 800-1000 DEG C, low-oxygen gas with an oxygen concentration of 1-8% and mineralization steam are continuously introduced, and pulse gas is introduced in a pulse mode to obtain a third material; step 4, the third material is kept for 180-360 min, and the low-oxygen gas is continuously introduced into the calcination device to obtain a fourth material; and step 5, the fourth material is cooled in the calcination device to obtain a finished product. Compared with the traditional process, the calcination method reduces energy consumption under the premise of the same performance of the finished product.

The utility model discloses a pesticide fluorination reaction crystallization device which comprises a reaction kettle body, a shell is arranged on the outer wall of the reaction kettle body, an ultrasonic generator is installed on one side of the circumferential outer wall of the shell, transducers are arranged at the bottom of the reaction kettle body in an annular array mode, and the ultrasonic generator is installed on one side of the circumferential outer wall of the shell. The reaction kettle body is provided with a stirring assembly used for stirring materials in the reaction kettle body, a feeding assembly used for feeding seed crystals into the reaction kettle body, and a driving assembly used for driving the stirring assembly and the feeding assembly. According to the reaction kettle, fine crystal nucleuses can be broken, excessive crystal nucleuses in the reaction kettle body can be reduced, so that the crystals grow more uniformly, the mass transfer efficiency is enhanced, the cooling process is more uniform, the phenomenon of local supercooling and superheating is avoided, stable growth of the crystals is facilitated, and the crystals are promoted to grow to a larger particle size; and subsequent solid-liquid separation and screening are facilitated.

The invention discloses a perovskite solar cell with a liquid crystal modification layer and a preparation method, and belongs to the technical field of perovskite solar cells. The liquid crystal modification layer is 2 '-fluoro-4' '-propyl-[1, 1'; the preparation method comprises the following steps: introducing 4, 4 ', 1'-terphenyl]-4-formonitrile (3PGPCN) into a SnO2 / perovskite interface to construct an interface regulation and control system with a triple synergistic effect, and forming an ordered molecular layer under the pi-pi accumulation action of a biphenyl structure to induce oriented growth of perovskite; c is equivalent to N which is coordinated with Sn sites on the surface of SnO2 and passivates Pb < 2 + > defects in perovskite, and fluorine atoms can passivate oxygen vacancies (VO) on the surface of SnO2 and inhibit migration of formamidine cations (FA < + >) in perovskite. In addition, the molecular dipole moment can regulate and control the energy band structure of the interface. The perovskite solar cell optimized by the 3PGPCN obtains the photoelectric conversion efficiency of 25.46%, and has excellent working stability.

The invention discloses a two-dimensional antiferromagnetic material and a preparation method and application thereof, and the method comprises the following steps: adopting Mn and Te elementary substance powder, taking I2 as a transportation agent, and synthesizing a blocky MnTe precursor through a vacuum chemical vapor transport method under a vacuum sealing condition; the preparation method comprises the following steps: mixing a ground MnTe precursor with In elementary substance powder and fluxing agent KCl powder, carrying out fluxing reaction in a vertical confinement space constrained by a constant normal pressure and in an inert atmosphere, and inducing the crystal to epitaxially grow along the horizontal direction, thereby forming a two-dimensional Mn (InTe2) 2 crystal on a fluorine crystal mica substrate, and carrying out wet transfer to obtain the two-dimensional Mn (InTe2) 2 crystal on a SiO2 / Si substrate, according to the method, the two-dimensional Mn (InTe2) 2 crystal with the antiferromagnetic characteristic is prepared through a step-by-step precursor induction type confinement pressure melting epitaxial method, and the method is simple in process and high in repeatability; the two-dimensional Mn (InTe2) 2 crystal has the characteristics of good crystal quality, large transverse size, controllable layer number and the like, and can be applied to a high-density magnetic storage device.

The application provides a preparation method of moth-eye structure SiO2 nanocone parallel array, and relates to the technical field of low-dimensional micromaterial preparation, and the method comprises the following steps: adopting a tubular furnace device, placing SiO powder after being fully ground in a tubular furnace reaction cavity filled with flowing protective gas, reacting at 1100-1150 DEG C for 3-4 h, and placing a substrate in a low-temperature area of the tubular furnace cavity to collect products; when the SiO2 nanocone parallel array is prepared, the protective gas flow is required to be controlled at 90-100 sccm; the growth position of the moth-eye structure SiO2 nanocone parallel array is controlled by a substrate area and a deposition temperature; the moth-eye structure SiO2 nanocone array is composed of parallel arranged SiO2 nanocones and nano particles on the top of the nanocones; the application has the advantages of simple method, rapid reaction, low cost, no pollution, high sample purity, no need to add a catalyst and the like; the prepared SiO2 nanocone parallel array can realize ordered growth in structure and size, and has application potential in the fields of catalysis, light filtering, light absorption, medicine and new materials and the like.