2625 results about "Fine powder" patented technology

The invention discloses an intelligent regulation and control method applied to cement grinding particle gradation, and relates to the technical field of cement grinding control, and the method comprises the following steps: S1, collecting grinding system operation parameters in real time, including mill current, powder concentrator rotating speed, feeding amount, grinding sound signals and online particle size detection data; s2, calculating core characteristic parameters based on the operation parameters, wherein the core characteristic parameters comprise an effective crushing power index, a dynamic fine powder retention rate and an in-mill material filling state index; s3, inputting the core characteristic parameters into a grading prediction model, and outputting predicted particle size distribution; s4, generating an adjustment instruction through a hierarchical control strategy based on the predicted particle size distribution; and S5, outputting the adjustment instruction to an execution mechanism. The particle size distribution is accurately predicted by collecting and analyzing the operation parameters of the grinding system in real time and combining core characteristic parameters, closed-loop intelligent regulation and control are achieved, the grinding efficiency, stability and product quality are improved, and meanwhile the control precision is optimized.

According to the mullite castable preparation method based on comprehensive utilization of the secondary aluminum ash nonferrous smelting slag, components are regulated and controlled by controlling the molar ratio of Al2O3 to SiO2, so that porous light mullite stably falls into a mullite phase region, and generation of excessive corundum phases is avoided. PMMA microspheres, corn flour, carbonized rice husks and SiO2 coated calcium carbonate composite pore-forming agent systems are adopted, and a layered slurry formula, gradient slip casting and segmented sintering processes are combined, so that the porosity and strength distribution are accurately regulated and controlled, and low-temperature sintering and amorphous phase change control are realized. By optimizing the grading of the porous light mullite aggregate and adding the homologous fine powder, the bonding strength and compressive strength of the castable are improved. And finally, the surface of the castable is coated with a compact mullite coating, so that the porosity is reduced, and the erosion resistance, corrosion resistance and stripping resistance are remarkably improved. The obtained castable has the advantages of light weight, high temperature resistance, high strength, low cost and excellent thermal stability and erosion resistance.

The invention provides an anti-corrosion ceramic sagger and a preparation method thereof.The anti-corrosion ceramic sagger comprises an aggregate layer and a matrix layer, and the aggregate layer is prepared from, by mass, 30-50 parts of yttrium-stabilized zirconia, 20-30 parts of silicon carbide and 15-25 parts of magnesium aluminate spinel; the matrix layer is prepared from the following raw materials in parts by mass: 40 to 50 parts of mullite micro powder, 30 to 40 parts of cordierite micro powder and 10 to 20 parts of binding agent. According to the anti-corrosion ceramic sagger and the preparation method thereof, by optimizing the raw material ratio and the preparation process, the corrosion depth is smaller than or equal to 0.19 mm after the sagger is soaked in the molten salt environment at 900 DEG C for 72 h, the service life is prolonged by 6-8 times compared with that of a traditional corundum sagger, and the anti-corrosion ceramic sagger has wide application prospects.

The invention relates to the technical field of concrete, and provides high-strength asphalt concrete and a preparation method thereof.The asphalt concrete is prepared from, by weight, 18-24 parts of asphalt, 8-16 parts of cement, 80-100 parts of gravel, 20-30 parts of cellulose ester derivatives, 40-50 parts of medium sand and 50-60 parts of mineral fine powder; the cellulose ester derivative comprises cellulose acetate phthalate and cellulose acetate, and the weight ratio of the cellulose acetate phthalate to the cellulose acetate is (1: 9)-(9: 1). According to the technical scheme, the problem of poor mechanical property of asphalt concrete in related technologies is solved.

The invention provides a composite solid waste-based cementing material and application thereof, the composite solid waste-based cementing material comprises 93-97 parts of industrial solid waste micro powder, 3-7 parts of an inorganic additive and 2-5 parts of an organic additive, and the invention further provides a preparation method of the composite solid waste-based cementing material. According to the solid waste-based cementing material provided by the invention, the hydration potential of all components in the solid waste-based cementing material is accelerated through the organic-inorganic composite admixture, the mechanical property and toughness of the solid waste-based cementing material are synergistically enhanced, the phenomena of falling off and falling off after molding are reduced, and the solid waste-based cementing material has important significance on the development of the solid waste recycling industry.

The invention relates to the field of graphite processing. The invention discloses a graphite fine powder dust collecting device and a using method, and aims at solving the problem that in the existing graphite machining process, although dust generated in the machining process can be sucked away by adopting dust suction equipment, dust on a graphite body cannot be effectively adsorbed. Therefore, the residual graphite dust still cannot be effectively removed. Graphite can be driven to turn over and move through cooperation between the conveying device and the clamping device, so that all positions of the graphite can be close to the air outlet end of an air outlet fan above, and the graphite can be rapidly, effectively and comprehensively cleaned; and in the overturning process of the graphite, after dust treatment of the graphite is achieved, the graphite is located above the discharging opening, then the graphite is subjected to discharging treatment, and the overall machining efficiency of the graphite is improved.

The invention discloses a long-life alumina crucible as well as a preparation method and application thereof. The raw material composition of the alumina crucible comprises pretreated quartz particles; the pretreated quartz particles are obtained through a pretreatment process; according to the pretreatment process, the surfaces of fused quartz particles are coated with a modifier through a granulation process, and the pretreatment process specifically comprises the steps that the fused quartz particles, the modifier and a binding agent are mixed, granulated and dried, and pretreated quartz particles are obtained. The fused quartz particle raw material is subjected to modification pretreatment, so that the crystallization behavior of fused quartz is reduced or inhibited, the stability of the fused quartz particles in the crucible firing and high-temperature service process is improved, and the binding property of the fused quartz particles and the fine powder component is enhanced, so that the mechanical properties such as breaking strength and fracture toughness of the alumina crucible are improved; therefore, the service life and the stability of the crucible are improved, and the performance of the alumina crucible can completely meet the requirement of the service life under extreme conditions in the fields of rare noble metal smelting and the like.

The invention relates to a preparation method of composite porous carbon beneficial to silicon deposition and a silicon-carbon composite negative electrode. The method comprises the following steps: (P1) carrying out surface oxidation treatment on porous carbon fine powder to obtain oxidized porous carbon fine powder; (P2) adding the oxidized porous carbon fine powder and ether polycarboxylic acid silanol into a solvent to obtain ether polycarboxylic acid silanol modified porous carbon fine powder; the ether polycarboxylic acid silanol is prepared by copolymerizing a polyether macromonomer, an acrylic monomer and an alkenyl silane coupling agent in water; (P3) soaking the ether polycarboxylic acid silanol modified porous carbon fine powder in a salt aqueous solution to obtain catalyst-loaded porous carbon; (P4) mixing the porous carbon loaded with the catalyst with a carbon source precursor solution, and performing spray drying to obtain a composite carbon precursor; and (P5) carbonizing and activating the composite carbon precursor to obtain the composite porous carbon beneficial to silicon deposition. The composite porous carbon prepared by the invention is beneficial to more uniform deposition of silicon in pores of the core porous carbon fine powder.

The invention discloses nanoscale high-entropy A2B2O7 type oxide ceramic powder and a preparation method of a nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, and the preparation method comprises the following steps: S1, uniformly dispersing a rare earth element source and a transition metal source in deionized water, stirring at room temperature, and then adding a polymerizing agent and an inducer to obtain a mixed solution; s2, continuously stirring at room temperature to form a transparent clear solution; s3, heating the transparent clarified solution until milk white gel is gradually formed; and S4, drying the milk white gel into dry gel. According to the nanoscale high-entropy A2B2O7 type oxide ceramic powder and the preparation method of the nano ceramic block of the nanoscale high-entropy A2B2O7 type oxide ceramic powder, discharge plasma sintering is combined with a two-step preparation process, the efficiency is high, sintering is compact, the grain size of a ceramic block material can be controlled, and the nano ceramic block can be used for preparing the nano-scale high-entropy A2B2O7 type oxide ceramic powder. And the synthesized oxide has the characteristics of fine powder particle size, uniform distribution, few impurities and the like, and the method is low in synthesis temperature and relatively low in cost.

The present disclosure relates to a preparation method of a super absorbent polymer composition. More specifically, it relates to a preparation method of a super absorbent polymer composition capable of pulverizing the hydrogel polymer to a normal particle size without agglomeration between particles by adding an additive having a specific structure, and significantly reducing the amount of fine powder generated during the process.

The present disclosure relates to a preparation method of a super absorbent polymer composition. More specifically, it relates to a preparation method of a super absorbent polymer composition capable of pulverizing the hydrogel polymer to a normal particle size without agglomeration between particles by adding an additive having a specific structure, reducing manufacturing cost by simultaneously performing a drying process and a surface cross-linking process, and significantly reducing the amount of fine powder generated during the process.

The invention relates to the technical field of powder screening, in particular to a stainless steel circular powder screening machine which comprises a vibrating screen body and a screen mesh. A bottom discharging opening of the feeding pipe corresponds to the outer edge of the screen, the bottom of the feeding pipe is connected with a partition plate, and the bottom face of the partition plate is connected with a vortex-shaped material pushing plate; the middle part of the feeding pipe is connected in series with a rotating pipe; the inner wall of the rotating pipe is fixedly connected with a spiral crushing blade; a rotation control assembly used for driving the feeding pipe, the partition plate and the material pushing plate to rotate synchronously and driving the rotating pipe to rotate relative to the feeding pipe is arranged on the vibrating screen body, and the rotating direction of the feeding pipe is consistent with the vortex direction of the material pushing plate; a discharging hole is formed in the middle of the screen and communicated with a coarse powder pipe, and a fine powder collecting plate is arranged in the vibrating screen body. According to the powder screening device, the powder accumulation condition can be improved, the retention time of powder on the screen can be prolonged, the screening quality can be improved, caked materials can be crushed, and waste can be reduced.

The invention discloses a continuous automatic micro-nano metal powder production device and method. The continuous automatic micro-nano metal powder production device comprises an ultrasonic atomization system, a high-temperature pyrolysis system, a product collection system and a tail gas treatment system which are sequentially connected. The product collection system comprises a physical separation device and an electrostatic-magnetic field synergistic adsorption device; the electrostatic-magnetic field synergistic adsorption device comprises an electrostatic collection device and a magnetic field adsorption device arranged on the outer side of the electrostatic collection device. The electrostatic collection device comprises a positive electrode electric field arrangement mechanism and a negative electrode electric field arrangement mechanism, and the positive electrode electric field arrangement mechanism is arranged in a cylindrical inner cavity of the negative electrode electric field arrangement mechanism; the positive electric field arrangement mechanism comprises a trunk and a plurality of positive electrode plates distributed in the axial direction of the trunk. Metal powder is collected in a physical separation, high-voltage static electricity and magnetic field cooperation mode, the problems that nanoscale and micron-sized fine powder is prone to leakage and difficult to collect are effectively solved, the powder collection rate is increased, and effective recycling of products is ensured.

The invention relates to the technical field of lithium ion batteries, and discloses lithium manganese iron phosphate and a preparation method thereof.The preparation method comprises the following steps that SP01, a lithium source, an iron source, a manganese source, a phosphorus source, a carbon source, a doping additive and water are mixed and ground into slurry; sP02, the slurry is subjected to screening and grading after being subjected to atomization drying; sP03, mixing the dried undersize material with a coating additive; sP04, putting the coated material into a kiln for sintering treatment; according to the method, fine powder does not exist in the obtained finished product lithium manganese iron phosphate, the graded material is coated and then sintered, and a double coating layer of a lithium ion conductor material and conductive carbon is formed on the surface of the lithium manganese iron phosphate material, so that the conductivity of the material can be improved; the direct contact between the material and electrolyte can be better protected, and the dissolution of manganese is avoided, so that the rate capability, the cycling stability and the safety of the material are improved.

The invention provides a preparation method of niobium-tungsten alloy spherical powder. The preparation method comprises the following steps: S1, proportioning and mixing: mixing raw material powder such as niobium powder, tungsten powder, molybdenum powder and zirconium carbide powder into mixed powder according to a proportioning table; s2, pressing and sintering, wherein the mixed powder is pressed into blocks in a mold through pressing equipment, and then the blocks are sintered into blanks in a vacuum state; s3, pulverizing and screening: pulverizing and screening the blank to obtain non-spherical powder with a proper particle size range; and S4, spheroidizing: spheroidizing the non-spherical powder to obtain spherical powder. According to the niobium-tungsten alloy spherical powder prepared through the method, the particle size range of the powder is 15-60 microns, the powder spheroidization rate is larger than or equal to 90%, the powder oxygen content is smaller than or equal to 150 ppm, and the Hall flowability is larger than or equal to 8.0 s / 50 g; the powder prepared by the process is low in oxygen content, appropriate in powder size distribution range and high in fine powder yield, the process flow is short, and a production line is convenient to build.

The invention discloses a samarium cobalt permanent magnet and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out crushing and jet milling on an alloy ingot formed by raw materials required by the samarium-cobalt permanent magnet to obtain first alloy fine powder with D50 of 4-6 microns; (2) 15-30 wt% of the first alloy fine powder is taken out, then the taken-out first alloy fine powder is subjected to ball milling, and second alloy fine powder with D50 being 0.5-1.2 microns is obtained; (3) the remaining first alloy fine powder and the second alloy fine powder obtained in the step (2) are mixed, and mixed powder is obtained; 4) carrying out orientation molding and isostatic pressing on the mixed powder to obtain a green body; and the green body is subjected to sintering, solid solution and aging treatment, and the samarium-cobalt permanent magnet is obtained. By adopting the preparation method disclosed by the invention, the bending strength of the samarium-cobalt permanent magnet can be obviously improved on the basis that the magnetic performance of the samarium-cobalt permanent magnet is not reduced basically.

The invention discloses a low-cost tantalum-tungsten alloy powder preparation method which comprises the following steps: degassing treatment: uniformly mixing superfine tantalum powder and tungsten powder according to a required ratio to obtain mixed powder, putting the obtained mixed powder into degassing equipment, vacuumizing and heating to volatilize gas impurities in the mixed powder and discharging the gas impurities; and isostatic pressing forming is conducted, specifically, the powder obtained after degassing treatment is loaded into a rubber mold sheath, isostatic pressing forming is conducted in a high-pressure environment, the powder is densified, and an obtained formed blank is put into a vacuum sintering furnace to be sintered. According to the method, an effective way for manufacturing low-cost, low-oxygen and low-carbon alloy powder is provided for the refractory metal spherical powder for additive manufacturing, low-grade, high-oxygen and unqualified tantalum-tungsten alloy fine powder waste can be recycled and formed, and the tantalum-tungsten alloy spherical powder reaching or exceeding the industrial standard is produced; the powder preparation production cost is greatly reduced, time and labor are saved, and the working efficiency is improved.

The invention discloses an anti-condensation device of a powder grinding and selecting machine for cement processing, and belongs to the technical field of cement processing devices. A powder grinding and selecting machine anti-condensation device for cement processing comprises an air bellow, a crushing box communicated with the air bellow is fixedly installed on the surface of the top end of the air bellow, a powder grinding and selecting box communicated with the crushing box is fixedly installed on the surface of the top end of the crushing box, a circular truncated cone column is fixedly installed in the powder grinding and selecting box, and a lower disc is fixedly installed on the surface of the circular truncated cone column. An upper disc sealed with the inner wall of the powder grinding and selecting box is fixedly mounted above the lower disc; and a plurality of rotatable outer air guide blades are arranged between the lower disc and the upper disc. Compared with a traditional fixed blade, the anti-condensation device of the powder grinding and selecting machine for cement processing has the advantages that the adjustable air guide blade enables air flow to flow evenly, powder selecting efficiency is improved, backflow of cement fine powder materials is avoided, abrasion to the inner air guide blade and the outer air guide blade is reduced, the service life of the air guide blade is prolonged, and the service life of the powder grinding and selecting machine is prolonged. And the noise is reduced due to uniform airflow flowing.

The invention relates to the technical field of ceramic fillers, in particular to a preparation method of a high-performance ceramic filler, which comprises the following steps: raw material preparation: selecting zirconium oxide powder as a raw material, dividing the raw material into a component A and a component B, the particle size of the zirconium oxide powder of the component A is 4 [mu] m, the particle size of the zirconium oxide powder of the component B is 20 [mu] m, the mass ratio of the component A to the component B is 2: 8, and the mass ratio of the component A to the component B is 2: 8; and corrosion treatment: carrying out corrosion treatment and electrostatic treatment on the component B zirconium oxide powder, and carrying out electrostatic treatment on the component A zirconium oxide powder. In the invention, the zirconium oxide powder of the component A and the component B has opposite charges, and the superfine powder can be uniformly adsorbed on the surface of the fine powder by utilizing electrostatic attraction, that is, the zirconium oxide powder of the two components can be mutually combined to form a zirconium oxide powder raw material with very rich surface pores, so that the specific surface area and the porosity performance of the ceramic filler are improved.

The invention relates to the technical field of physical crushing of materials, in particular to a process and equipment for crushing PTFE (Polytetrafluoroethylene) micro powder for a coating. The pre-treatment assembly is used for pre-treating PTFE raw materials, including drying, primary crushing and impurity removal, the mechanical grinding assembly is used for grinding the PTFE raw materials until the particle size requirement of the PTFE micro powder for the coating is met, and the physical crushing assembly is used for assisting the mechanical grinding assembly in crushing the PTFE raw materials. The grading and screening assembly is used for separating the crushed and ground PTFE micro powder according to the particle size, and the collecting and packaging assembly is used for sealing and packaging the graded PTFE micro powder. The low-temperature smashing and circulating process remarkably reduces energy consumption, meanwhile, raw material loss is reduced, the closed system design gives consideration to production efficiency and operation safety, graded packaging supports customized product output, and the requirements of diversified scenes from high-precision electronic coatings to industrial anti-corrosion coatings and the like are met.

The invention discloses a method for preparing spherical metal fine powder by using coarse / waste powder through ultrasonic atomization, which comprises the following steps of: (1) collecting coarse / waste powder raw materials for ultrasonic atomization powder preparation, (2) conveying the coarse / waste powder to an electric arc melting area through argon gas flow, and carrying out melting and ultrasonic atomization powder preparation processing; (3) in the powder preparation process, the powder is continuously collected by using argon circulating airflow, so that the continuity of the powder preparation process is ensured; and (4) finally screening the prepared powder in particle size ranges to obtain high-quality spherical fine powder in different particle size ranges. According to the method, the recycling and reusing problems of 3D printing splashing waste powder and coarse powder in the traditional gas atomization powder manufacturing process are solved, and the powder pollution risk is remarkably reduced; according to the ultrasonic atomization re-powdering technology, the high-quality spherical metal fine powder needed by additive manufacturing can be efficiently prepared, powder waste discharge and environmental burden are reduced, the obtained powder can be directly used as a high-quality raw material for additive manufacturing, and green and sustainable development of the metal additive manufacturing industry is promoted.

To provide a powder coating device that removes only fine powders that are difficult to attach to a coated object from a recovery powder circulation path, suppresses a ratio of fine powders contained in recovery powders, and has high adhesion efficiency.SOLUTION: A powder coating device performs coating by blowing a powdered paint A conveyed by conveyance air from a coating material tank 1 to a coated object W in a powder coating booth 6, and comprises a circulation path that recovers overspray powders which have not attached to the coated object W and returns the recovered recovery powders to the coating material tank 1. In the powder coating device, a fine powder removal device for removing fine powders which are difficult to adhere to the coated object is installed in the recovery powder circulation path.SELECTED DRAWING: Figure 1

The invention discloses a water-based zircon powder coating which comprises the following components in parts by weight: 100 parts of refractory aggregate, 4-10 parts of a binder, 2-5 parts of a dispersing agent, 2-8 parts of a suspending agent, 0.1-2 parts of a wetting agent, 1-4 parts of a defoaming agent, 1.5-3 parts of a coalescing agent and 10-30 parts of water, the refractory aggregate is zircon powder and comprises coarse powder and fine powder; the suspending agent comprises cellulose modified magnesium silicate and a component 2, and the component 2 comprises at least one of sodium bentonite, lithium bentonite and attapulgite. According to the water-based zircon powder coating disclosed by the invention, the density, the solid content and the like of the coating are maintained at a relatively high level while the water-based zircon powder coating has low viscosity, so that the coating establishment efficiency is effectively improved, and the one-time spraying thickness can reach 1.0-1.2 mm; the coating drying time is greatly shortened, and the working efficiency is improved; the coating is excellent in sand burning resistance and good in stripping performance, is used for casting production, especially large steel casting production, and greatly reduces casting defects and post-treatment workload.

The invention provides a self-leveling underwater filling material. The self-leveling underwater filling material is prepared from the following raw materials in parts by weight: 15-18 parts of a low-carbon cementing material, 8-10 parts of fly ash, 45-50 parts of engineering slurry, 0.2-0.4 part of biological glue, 3-5 parts of plant residue charcoal, 45-50 parts of recycled fine aggregate, 10-20 parts of recycled micro powder and 10-15 parts of water. The invention also provides a preparation method of the self-leveling underwater filling material. The self-leveling underwater filling material provided by the invention has relatively good strength and working performance, and is relatively low in cost.

The invention relates to the technical field of building materials, and particularly discloses steel slag-slag composite micro powder green low-carbon concrete and a preparation method thereof. The steel slag-slag composite micropowder green low-carbon concrete is prepared from the following raw materials in parts by weight: 25-35 parts of modified steel slag microspheres, 20-30 parts of slag micropowder, 10-15 parts of cement, 30-40 parts of coarse aggregate, 1.2-2 parts of an additive and 18-30 parts of water, the steel slag microspheres are porous steel slag microspheres, an exciting agent is loaded in pores of the steel slag microspheres, and a phase change material is packaged in the pores of the steel slag microspheres; the preparation method comprises the following steps: mixing and dry-mixing the modified steel slag microspheres, the slag micro-powder and the cement, adding the coarse aggregate and the water, uniformly stirring, adding the additive, and uniformly stirring to obtain the steel slag-slag composite micro-powder green low-carbon concrete. The composition can be used in the fields of building structures, road engineering, marine facilities and the like, and has the advantages of high early strength and good mechanical properties.

The invention relates to the technical field of refractory materials, in particular to a magnesium-calcium-zirconium-carbon brick production method which comprises the following components in parts by weight: 60-80 parts of sintered magnesium-calcium-zirconium sand particles, 10-30 parts of fused magnesia particles, 2-4 parts of zirconium oxide, 0.5-3 parts of silicon carbide fine powder, 2-6 parts of nano yttrium oxide high-dispersion particles, 1-2 parts of C9 petroleum resin powder, 2-7 parts of graphite, 4-6 parts of binding agent and 0.3-0.5 part of urotropin. The rare earth material nano yttrium oxide high-dispersion particles are introduced, the magnesium-calcium-zirconium-carbon brick has the advantages of high temperature resistance, good hydration resistance, good thermal shock resistance, good oxidation resistance and good erosion resistance, the magnesium-calcium-zirconium-carbon brick is dried by an electric drying kiln as an unburned brick, a tunnel kiln firing process is omitted, the labor cost and energy consumption are reduced, and the production cost is reduced. And the emission of greenhouse gas and toxic and harmful gas generated by fuel combustion is avoided, and the biomass fuel is an environment-friendly product.

The invention relates to a high-purity corundum brick with high thermal shock resistance and a preparation method thereof, and belongs to the technical field of refractory materials. The high-purity corundum brick with high thermal shock resistance is prepared from the following raw materials in parts by mass: 55 to 65 parts of tabular corundum particles, 20 to 25 parts of tabular corundum fine powder, 8 to 12 parts of modified fused zirconia corundum particles, 5 to 8 parts of nano aluminum oxide powder, 2 to 3 parts of rho-aluminum oxide powder, 0.3 to 1 part of toughening agent and 0.3 to 1.5 parts of binding agent. The toughening agent increases the fracture toughness of the high-thermal-shock-resistance high-purity corundum brick through a plurality of strengthening mechanisms such as crack deflection, crack branching and microcracks, so that the high-thermal-shock-resistance high-purity corundum brick has high thermal shock resistance and mechanical properties. Meanwhile, the fused zirconia corundum has a short fiber structure through modification, and fibers can hinder linear propagation of main cracks, force the cracks to deflect and form crack branches, so that the thermal shock resistance and mechanical properties of the high-purity corundum brick with high thermal shock resistance are further enhanced.

The invention discloses an Ag2Se-based thermoelectric material and a preparation method thereof, and belongs to the technical field of thermoelectric materials. The preparation method comprises the steps that Ag powder and Se powder are mixed and ground according to the molar ratio of (1.9-2.1): 1, and mixed powder is obtained; the mixed powder is subjected to cold pressing to form blocks, and prefabricated blocks are obtained; the prefabricated block is subjected to heat preservation for 20-120 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 400-1000 DEG C, and an Ag2Se initial product is generated through reaction; crushing the primary product, and grinding into fine powder; and sintering the fine powder for 5-30 minutes under the conditions that the pressure is 1-5 GPa and the temperature is 300-900 DEG C, so as to obtain the composite material. The sample is prepared through high temperature and high pressure for the first time, the method is simple, operation is easy to control, the preparation period can be greatly shortened, and the energy utilization rate is increased; the electroacoustic transport performance of Ag2Se is effectively regulated and controlled by changing the pressure and the temperature, and finally the thermoelectric performance is effectively improved.

The invention relates to the technical field of composite bricks, and discloses a microcrystal bead efficient water-permeable composite brick and a preparation method thereof.The preparation method comprises the steps that ceramic shale particles, ceramic fine powder, white cement, a reinforcing agent and water are added into a stirrer, stirring and discharging are conducted, and a base layer is obtained; adding the natural colored sand, the modified polyurethane, the epoxy nano silicon dioxide, the quartz powder and the polycarboxylate superplasticizer into a stirrer, stirring, and uniformly paving on the base layer for extrusion forming. In the stirring process, a terminal hydroxyl group in the modified polyurethane reacts with an epoxy group in the epoxy nano silicon dioxide to generate a ring-opening reaction, so that the compatibility of the modified polyurethane and the epoxy group is increased, and the modified polyurethane and the epoxy nano silicon dioxide are more uniformly dispersed in the composite brick; the adamantane structure in the modified polyurethane has better stability, the mechanical property of the composite brick is improved, the durability of the composite brick is improved by the ferrocene group, and the durability and pressure resistance of the composite brick can be improved by the polyurethane.

The invention provides a porous ceramsite adsorption material prepared from straw biochar and rare earth tailings as well as a preparation method and application of the porous ceramsite adsorption material, and belongs to the technical field of environmental functional adsorption materials. The preparation method of the porous ceramsite adsorption material using the straw biochar and the rare earth tailings comprises the following steps: sequentially performing acid pickling and drying on the straw biochar to obtain acidified biomass charcoal; the rare earth tailings are subjected to ball milling, and tailings fine powder is obtained; mixing the acidified biomass charcoal, the tailing fine powder, the attapulgite and the wood chips to obtain a mixture; adding a binding agent and water into the mixture, and sequentially performing kneading and extrusion molding to obtain a ceramsite precursor; and calcining the ceramsite precursor in a protective atmosphere to obtain the porous ceramsite adsorption material. The technical problems that a traditional adsorption material is low in adsorption capacity, poor in strength and difficult to recycle are solved through ternary compounding of the acidified biomass charcoal, the rare earth tailings and the attapulgite and in combination with wood chip pore-forming, segmented calcination and acid pickling pretreatment.