4812results about "Silica" patented technology

The invention relates to a microwave magnetizing roasting-gradient magnetic separation iron removal method and purification process for quartz ore. Firstly, impurity minerals / inclusions in ores are magnetically modified through microwave magnetizing roasting, weak magnetic minerals in quartz minerals are converted into strong magnetic minerals through a gaseous reducing agent, introduction of solid impurities is avoided, meanwhile, the Fe-containing gas-liquid inclusions are subjected to heating decomposition and magnetic conversion at the specific temperature, and the Fe-containing gas-liquid inclusions are subjected to magnetic modification; and removing magnetic minerals through a gradient magnetic separation process of permanent magnet-high-strength superconducting magnetic separation to obtain the low-iron quartz sand. Due to the characteristic of selective microwave heating, gas / solid inclusions are more easily broken and exposed outside, the efficiency of impurity removal and purification in the subsequent process is effectively improved, and high-purity quartz sand with Fe less than or equal to 0.05 ppm and SiO2 more than or equal to 99.998% can be obtained by matching with purification processes such as acid leaching, flotation and chloridizing roasting. According to the method, ferromagnetic and weakly magnetic impurities, inclusions and the like in the quartz sand can be removed in a targeted mode, the iron removal effect is extremely good, the process is simple and efficient, and the method is more environmentally friendly.

The invention discloses a high-purity quartz sand reinforced chlorination purification method, and belongs to the technical field of inorganic non-metallic material processing. The method comprises the following steps: putting a quartz sand raw material containing crystal structure impurities into a roasting furnace, and synchronously introducing a gas chlorinating agent and a gas reducing agent into the roasting furnace for roasting to obtain purified quartz sand. According to the method, on the basis of conventional chloridizing roasting purification, a gas reducing agent is introduced to regulate and control the reaction atmosphere, efficient dissociation and chlorination of crystal structure impurities difficult to remove are promoted, and deep efficient purification of quartz sand is achieved. The method has the advantages of simple process equipment, high raw material applicability, high impurity removal efficiency and the like, and can be widely applied to production of 4N5-grade and above high-purity quartz sand.

The invention relates to the technical field of composite film preparation, in particular to a multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film and a preparation method thereof.The multi-layer co-extrusion nano ceramic coating high-barrier medicine packaging composite film comprises a base material layer, a gas barrier layer, a bonding transition layer and a nano ceramic functional coating; the base material layer comprises the following components in parts by mass: 80-100 parts of biaxially oriented polypropylene; 20 to 30 parts of metallocene linear low density polyethylene; 5 to 8 parts of nano titanium dioxide; 0.5 to 1 part of beta-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid; and 0.3 to 0.6 part of calcium stearate. Through the multi-layer co-extrusion and gradient curing technology and the five-layer co-extrusion technology, it is ensured that the thickness of a base film is uniform and interlayer bonding is firm, the adhesive force of the coating is enhanced through plasma surface treatment, and activity retention and uniform distribution of functional components are guaranteed through the segmented curing strategy of the nano ceramic coating; compared with a traditional hot-pressing compounding or solvent coating process of the composite film, the energy consumption and the solvent residue risk are greatly reduced, meanwhile, the production efficiency and the product consistency are improved, and large-scale application is provided for medicine packaging.

The invention relates to a preparation method of spherical silicon dioxide micropowder with ultralow dielectric loss. The preparation method comprises the following steps: preparing an organic silicon polymer; preparing slurry; performing solid-liquid separation on the synthetic slurry to obtain concentrated slurry, and drying the concentrated slurry to obtain spherical silica powder; carrying out low-temperature heat treatment on the obtained spherical silica powder at 1500-7000 DEG C for h to remove residual organic matters and free water in the powder; then, high-temperature densification is carried out at the temperature of 3000-28000 DEG C for h, and moisture is further removed; adding a modifier into the stirring equipment for surface modification; and after surface modification, drying at 55-300 DEG C for h, and removing modified micromolecular byproducts to obtain the spherical silicon dioxide micro powder with ultralow dielectric loss. The method is simple in production process, short in production period, low in production cost, high in yield and capable of effectively reducing the dielectric loss of the spherical silicon dioxide micro powder.

According to the invention, biomass rice hull ash and a sodium hydroxide solution are reacted to obtain water glass and carbon mud. And reacting the water glass with CO2 generated by calcining the limestone to produce a white carbon black product and a mixed waste liquid of sodium carbonate and sodium bicarbonate. Meanwhile, quick lime obtained by calcining limestone is digested and then reacts with sodium carbonate and sodium bicarbonate mixed waste liquid to generate a light calcium carbonate product and dilute sodium hydroxide waste liquid. And finally, the dilute sodium hydroxide waste liquid is concentrated and reused for water glass production, so that the waste liquid is recycled, and a complete process closed loop is formed. According to the process method disclosed by the invention, two leading-edge innovative processes, namely production of white carbon black by renewable resource biomass rice hull ash and production of white carbon black by a carbonization method, are organically combined and are coupled with production of light calcium carbonate by a limestone calcination process, so that the problem that a large amount of sodium sulfate-containing wastewater is discharged in a traditional process is solved; meanwhile, the carbon footprint of white carbon black and calcium carbonate products is greatly reduced.

The invention relates to the technical field of high-purity quartz sand preparation, in particular to a process for producing high-purity quartz sand from quartz ore with high iron and aluminum content, which comprises the processes of coarse crushing, screening, acid leaching, roasting and water quenching, fine crushing, screening, magnetic separation, acid scrubbing, flotation, acid pickling, chlorination purification, magnetic separation and the like. And metal impurities and non-metal impurities in the ore are systematically removed. And through rough crushing and screening, ore with high impurity content is screened out in advance, and interference of impurities to subsequent procedures is reduced. And it is ensured that in the subsequent fine crushing and flotation process, the content of impurities in the quartz ore is small, it is avoided that due to excessive impurities, the subsequent treatment difficulty is increased, and the production efficiency is improved. And then the links of acid leaching, roasting water quenching, flotation, acid pickling, chlorination purification and the like are carried out, so that common impurities in the ore can be effectively removed. Through multiple acid treatment and high-temperature chlorination purification, it is ensured that impurities are converted into volatile compounds and thoroughly removed, and the purity of the quartz sand is remarkably improved.

A composition of matter is provided comprising hierarchically ordered crystalline microporous material having well-defined long-range mesoporous ordering of lamellar symmetry. The composition possesses mesopores having walls of crystalline microporous material and a mass of mesostructure between mesopores of crystalline microporous material. Long-range ordering is defined by presence of secondary peaks in an X-ray diffraction (XRD) pattern and / or lamellar symmetry observable by microscopy.

The invention provides a preparation method and application of a dopamine hydrochloride modified cerium oxide core-shell abrasive, and the preparation method comprises the following steps: adding water into cerium salt until the cerium salt is completely dissolved, taking out silicon dioxide micro-powder in which the mass ratio of the cerium salt to the silicon dioxide micro-powder is (0.5: 1)-(7: 1), and ultrasonically dispersing the silicon dioxide micro-powder in absolute ethyl alcohol to obtain dispersion liquid; mixing the dispersion liquid with a hexamethylenetetramine aqueous solution and a cerium salt aqueous solution, heating in an oil bath, stirring and reacting to obtain a mixed solution, centrifuging the mixed solution, washing with deionized water and absolute ethyl alcohol, drying to obtain a mixed solid, and calcining the mixed solid to obtain a cerium precursor; and dispersing the cerium precursor in a mixed solution obtained by deionized water and ethanol, slowly adding dopamine hydrochloride and a buffer solution, stirring, centrifuging, washing and drying to obtain the photocatalyst. According to the polishing solution prepared from the abrasive, the removal rate reaches 0.1458 mg / min.

The invention belongs to the field of material preparation and chemical engineering, and particularly relates to an N-doped modified MOFs (Metal-Organic Frameworks) derived core-shell nanoreactor as well as a preparation method and application thereof. The preparation method comprises the following steps: taking cobalt as a node metal, synthesizing an N-doped modified MOFs material with an organic ligand and a nitrogen source through a hydrothermal reaction, then coating the surface of the material with porous silicon dioxide, and preparing the N-doped modified MOFs derived core-shell nanoreactor through a two-step calcination method. The MOFs derived core-shell nanoreactor prepared by the invention has a large specific surface area, a rich pore structure and excellent catalytic activity and stability, and is high in catalytic activity, good in recycling stability and suitable for large-scale popularization and application when being used as a catalyst for alpha, beta-unsaturated aldehyde transfer hydrogenation.

The invention relates to the technical field of molybdenum metallurgy, and particularly discloses a crystal preparation method of ammonium heptamolybdate, which comprises the following steps: taking low-grade molybdenite, crushing, ball-milling, and calcining to obtain molybdenum calcine. And dispersing the molybdenum calcine with a sodium hydroxide solution, and filtering to obtain a leaching solution. And then adding a compound chelating agent into the leachate, carrying out adsorption and desorption treatment to obtain a sodium molybdate solution, then adjusting the pH value, carrying out ammonia leaching, and then carrying out cooling crystallization to obtain ammonium heptamolybdate. By adopting the prepared compound chelating agent, the purity of ammonium heptamolybdate prepared by taking low-grade molybdenite as a raw material can be improved, and after desorption treatment, separated precipitates can be used as the compound chelating agent again for adsorbing molybdate radicals, so that the aim of cyclic utilization is achieved.

The invention discloses spherical silicon dioxide, a high-frequency high-speed copper-clad plate and a preparation method of the spherical silicon dioxide. The dielectric constant Dk of the spherical silicon dioxide is 3.5 F / m-4. 0F / m, the dielectric loss Df is 0.0001-0.005, the amorphous state proportion is larger than or equal to 99%, the spheroidization rate is larger than or equal to 99%, and the porosity is 0.1%-2%. During preparation, the hydrolysis degree is controlled till partial polycondensation is achieved, then under the oxygen introduction condition, pre-oxidation is conducted at the low temperature to remove alkyl, gradient calcination is conducted at the high temperature, local crystallization influence and defect influence caused by powder spontaneous combustion are prevented, meanwhile, viscous bodies in the microspheres are accurately controlled to flow to fill nanoscale pores, and the particle size is reduced. The spherical silicon dioxide with high purity, high spheroidization rate and low dielectric loss is obtained, the dielectric property of the high-frequency and high-speed copper-clad plate can be met, and the high thermal stability and high reliability of the high-frequency and high-speed copper-clad plate are improved.

The invention discloses a purification method for removing quartz inclusion, which comprises the following steps: calcining a quartz sand raw material at high temperature for a certain time, then taking out and quickly putting into cold water for cold quenching; dehydrating quartz sand, feeding into a microwave reactor, heating to a set temperature, and keeping for a period of time; after the reaction is finished, cleaning the quartz sand with ultrapure water; filling the quartz sand into a high-temperature and high-pressure reactor, introducing supercritical carbon dioxide and hydrogen fluoride mixed gas, and keeping the temperature and the pressure for a period of time; and after the reaction is finished, discharging gas to obtain the high-purity quartz. Through two-stage heat treatment, a channel between gas-liquid inclusions in quartz particles and the outside can be efficiently opened, and meanwhile, the supercritical method ensures that impurities in the inclusions can be effectively dissolved out; the treatment time is short, the required temperature is low, the acid consumption is less than 10%, and the method has the advantages of high efficiency and low cost.

The invention provides a wear-resistant, transparent, flexible and fluoride-free super-hydrophobic composite coating and a preparation method thereof. The preparation method comprises the following steps: mixing hydroxyl-terminated polydimethylsiloxane, gamma-aminopropyltriethoxysilane and dibutyltin dilaurate for reaction to obtain a modified precursor solution, adding swelled epoxy resin into the modified precursor solution, and heating for reaction to obtain siloxane modified epoxy resin; the preparation method comprises the following steps: dispersing nano silicon dioxide in an ethyl acetate solution to form a SiO2 suspension; and uniformly mixing the modified epoxy resin with a SiO2 suspension, adding polyether amine as a curing agent, stirring and mixing, and constructing the epoxy resin / hydroxyl-terminated polydimethylsiloxane / nano-silica super-hydrophobic coating on a substrate by adopting an air spraying mode. According to the preparation method disclosed by the invention, the super-hydrophobic coating with excellent transparency and flexibility and good adhesive force and wear resistance can be prepared, and the super-hydrophobic coating has a wide application prospect in the fields of wearable electronic equipment, photoelectric devices and the like.

The invention discloses core-shell type hydrophobic modified activated carbon and a preparation method thereof. The obtained hydrophobic activated carbon is composed of a core (activated carbon) and a shell (hydrophobic breathable silicon dioxide shell). The method comprises the following three steps: (1) constructing a silicon dioxide shell layer: dispersing pretreated activated carbon in a solvent, adding tetraethyl orthosilicate into the solvent, firstly adjusting the pH value of a reaction solution to be weakly acidic, stirring for 20-30 minutes under a certain stirring condition, then adjusting the pH value of the reaction solution to be weakly alkaline, continuously stirring for 0.5-1 hour to obtain a suspension A, and carrying out centrifugal drying treatment on the suspension A to obtain the silicon dioxide shell layer; an intermediate product coated with a hydrophilic silicon dioxide shell layer is obtained; (2) hydrophobic group grafting: dispersing the obtained intermediate product in a solvent, adding siloxane with different alkyl chain lengths into the solvent, fully stirring to obtain a suspension B, and performing centrifugal drying treatment to obtain hydrophobic modified activated carbon; cleaning and drying the hydrophobic modified activated carbon; and (3) adding a hydrophilic group: grafting the hydrophilic group on the silicon dioxide shell layer in an acid environment.

The invention relates to the technical field of quartz sand pickling, and discloses a quartz sand pickling device and a method thereof.The quartz sand pickling device comprises a mounting unit, a transmission unit, a limiting rotating unit, a discharging unit and a material changing unit, the mounting unit comprises a mounting shell, a sliding door is arranged on the outer side wall of the mounting shell, and a feeding port is formed in the upper portion of the mounting shell; four supporting legs which are mutually symmetrical in pairs are arranged at the bottom of the mounting shell, and an acid washing liquid placing box is arranged at the bottom of an inner cavity of the mounting shell. According to the quartz sand pickling device, a guide plate vertically moves downwards through a driving assembly, when the guide plate vertically moves downwards, a sealing rod can vertically move downwards, so that quartz sand is discharged and enters an acid pickling liquid containing box arranged below for pickling and cooling, and meanwhile, the driving assembly can further drive a heating box to rotate; and an internal structure of the limiting rotating unit vertically moves downwards, so that the material changing unit can change the placed quartz sand.

The invention provides a preparation method of silicon dioxide serving as a flow promoter in a powder coating. The preparation method comprises the following steps: synthesizing silicon dioxide by using a precipitation method; washing and filter-pressing to obtain a precipitate; re-dispersing and pulping the silicon dioxide by using pure water; performing drying; performing high-temperature crushing; the synthesis of silicon dioxide comprises the following steps: adding bottom water, and heating to 40-100 DEG C; adding water glass and acid into the bottom water in a parallel flow manner under the conditions of constant temperature and pH value of 5.0-10.0; adjusting the pH value to 2.0-4.0 by using an acid; the specific surface area of the silicon dioxide is 100-500m < 2 > / g; the bulk ratio of the silicon dioxide is not higher than 0.30 g / cm < 3 >; the particle size of the silicon dioxide is not higher than 5.0 microns; the methanol value of the silicon dioxide is higher than 30%; the drying weight loss of the silicon dioxide is not higher than 3.0%. The preparation method of the silicon dioxide serving as the flow promoter in the powder coating is simple in process and low in cost.

The invention discloses a method for preparing monodisperse silica core-shell microspheres by adopting a double template method, and relates to the technical field of chromatographic separation materials. The invention utilizes micron-level polymer microspheres and nanometer-level pore templates, and by adding silicon sources and catalysts at different time periods, the pore templates are coated on solid silica microspheres to form composite silica core-shell microspheres, and the microsphere templates and the pore templates are removed by dissolution extraction and high-temperature calcination to obtain silica core-shell microspheres with porous surfaces. The invention completes the control of the particle size of the microspheres, the thickness of the core-shell layer and the size of the pore structure in the same reaction system, and solves the problems of the traditional long time consumption and the occurrence of agglomeration. The silica core-shell microspheres prepared by the technology have good morphology and monodispersity, and the core-shell layer thickness and pore structure control method are simple, and are suitable for use in chromatographic separation.

The invention discloses high-purity quartz sand purification equipment in the technical field of quartz sand purification equipment, and the high-purity quartz sand purification equipment comprises a hopper, a preheating rack, a furnace tube supporting frame, a preheating furnace, a rotating tube motor, a high-temperature furnace rack, a horizontal high-temperature reaction furnace, a vertical high-temperature reaction furnace and a cold sand rack, a vibration feeding hopper is arranged at the bottom of the hopper, and a vibrator is arranged at the bottom of the vibration feeding hopper; a preheating furnace tube is arranged at the right end of the preheating furnace, a sand receiving hopper is arranged at the left end of the preheating furnace, a quartz furnace tube is arranged at the left end of the horizontal high-temperature reaction furnace, a second sand receiving hopper is arranged at the left end of the quartz furnace tube, and a sand separating hopper is arranged at the bottom of the second sand receiving hopper. The quartz sand in a high-temperature state enters the horizontal high-temperature reaction furnace, so that the temperature of the quartz sand can be quickly increased to the temperature required by the purified gas, the heating time is shortened, the reaction time of the quartz sand and the purified gas is prolonged, and the product quality is improved.

The invention relates to a method for removing impurities in quartz ore through cascade chloridizing roasting, and belongs to the technical field of quartz sand purification. The method comprises the following steps: crushing cleaned natural quartz ore, and carrying out ball milling to obtain quartz ore particles; the quartz ore particles are heated to 400-700 DEG C at a constant speed, HCl gas is introduced, and first-stage roasting is carried out for 2-3 h; heating the quartz ore particles roasted at the first stage to 800-1100 DEG C at a constant speed, introducing Cl2, roasting at the second stage for 2-3 hours, and cooling to room temperature at a constant speed; and adding the quartz ore particles roasted at the second stage into deionized water, stirring at room temperature, carrying out water leaching for 4-8 hours, carrying out solid-liquid separation, and drying to obtain the high-purity quartz particles. According to the method, the quartz ore particles are subjected to two-stage cascade chloridizing roasting, different inclusion impurities in the quartz ore are removed, the removal rates of the final impurities Fe, Al, Na and K can reach 99.92%, 71.52%, 80.19% and 85.79%, and the light transmittance can reach 90% or above.

The invention belongs to the technical field of quartz sand preparation, and discloses high-purity quartz sand and a preparation method thereof. The method comprises the following steps: by taking water, mixed alkali and silicon powder as raw materials, uniformly stirring the silicon powder, the water and an additive to prepare silicon sludge, adding the rest raw materials into a reaction kettle, heating, then adding the silicon sludge into the reaction kettle in a frequency division manner, reacting to obtain a sodium silicate solution, removing anion and cation impurities, then adding an acid solution, heating to obtain silicic acid gel, and drying to obtain the silica gel. The silicic acid gel is subjected to freezing treatment, vacuum microwave drying and chloridizing roasting after unfreezing are conducted, and the high-purity quartz sand is obtained. According to the preparation method, the quartz sand with the purity higher than 99.9999% can be synthesized, the granularity of the quartz sand can be controlled according to the adding proportion of the acid solution, the content of gas-liquid inclusion in the quartz sand is remarkably reduced, and the quality of the quartz sand is improved.

The invention discloses a method for preparing ultra-high-purity quartz by multi-stage synergistic purification of quartz ore, and belongs to the technical field of ultra-high-purity quartz preparation. According to the method, natural quartz ore is used as a raw material, mineral impurities, lattice impurities and inclusions in quartz are deeply removed through multi-stage synergistic processes such as low-temperature plasma activation, biological leaching, supercritical CO2-assisted acid leaching, microwave-assisted chloridizing roasting and pulsed electric field enhanced acid leaching, and finally a high-purity quartz product with the SiO2 purity larger than or equal to 99.998% (4N8 grade) is obtained. According to the invention, a low-temperature plasma activation technology, microbial metallurgy, supercritical fluid extraction and a pulsed electric field strengthening technology are organically combined, so that the energy efficiency bottleneck and environmental protection limitation of a traditional high-purity quartz preparation process are broken through; the obtained quartz sand product can reach the standards of high-purity quartz sand for semiconductor quartz glass and high-purity quartz sand for photovoltaic quartz crucibles.

The invention discloses a BOE waste liquid resource reutilization method, which comprises: 1, converting silicon ions in a BOE waste liquid into SiO2 precipitate, removing the SiO2 precipitate, and converting fluorine ions in the BOE waste liquid into NH4F; 2, fluorine ions in the filtrate obtained in the step 1 are converted into CaF2, and ammonium ions in the filtrate obtained in the step 1 are converted into ammonia water; 3, ammonia gas in the filtrate obtained in the step 2 escapes, CaF2 is separated after the filtrate is cooled, the separated CaF2 is used for producing HF, and the HF is used for preparing BOE for recycling; 4, directly feeding the filtrate obtained in the step 3 to sewage treatment; 5, the ammonia gas obtained in the step 3 is used for silicon removal and BOE preparation in the step 1 for recycling. According to the method, high-purity CaF2 can be obtained with high yield, NH4 < + > in BOE can be recycled, and the whole process is high in resource utilization rate and high in fluorine ion recovery rate.

The invention discloses a method for comprehensively recovering silicon and magnesium based on rotary kiln-electric furnace type ferronickel slag. The method comprises the following steps: carrying out ball milling, leaching and solid-liquid separation on the rotary kiln-electric furnace type ferronickel slag, standing supersaturated silicon in a leaching solution at normal temperature to generate a gel phenomenon, stirring and crushing to obtain a mixed phase of a magnesium sulfate solution and a silica gel block, and separating the gel solution to obtain a magnesium sulfate crude solution and wet crude silica gel; preparing high-purity hydrated magnesium sulfate with the purity of 99.9% from the magnesium sulfate crude liquid through processes of purification, crystallization and the like; the wet coarse silica gel is subjected to further alkali dissolution, gel forming and other processes to produce silica gel with the purity of 99%; the method has the advantages of low energy consumption, high product added value and element recovery rate and convenience in industrialization, and has excellent popularization and application prospects.

The invention relates to the technical field of quartz sand purification, and discloses a quartz sand acid quenching purification device and a using method thereof.The quartz sand acid quenching purification device comprises a shell and supporting legs fixedly connected to the bottom end of the shell, a stirring mechanism is arranged in the shell, a drying mechanism is arranged below the stirring mechanism, and a discharging mechanism is arranged above the stirring mechanism; the stirring mechanism comprises a supporting seat fixedly connected to the top end of the shell, a double-shaft motor is installed at the top end of the supporting seat, a first gear is fixedly connected to the output end of the left side of the double-shaft motor, the first gear is meshed with a second gear, and crushing rollers are fixedly connected to the outer walls of the other ends of the first gear and the second gear; the double-shaft motor can drive the rotating column to rotate, so that the first stirring blade is driven to move up and down, and meanwhile, the first stirring blade is driven to rotate while revolving, so that quartz sand and aqua regia in the partition frame are fully stirred, corrosion is accelerated, and the purification efficiency is improved.

The invention belongs to the technical field of batteries, and particularly discloses a biomass-derived silicon-carbon negative electrode material as well as a preparation method and application thereof. The preparation method comprises the following steps: mixing biomass derived carbon obtained through acid pickling, alkali extraction, re-precipitation, drying, carbonization and ball milling with diatom biological silicon dioxide obtained through precipitation collection, oxidation and acidolysis, filtration and washing, drying and calcination, and carrying out ball milling to finally obtain the synergistic composite silicon-carbon material. The silicon-carbon negative electrode material has the characteristics of high porosity and large specific surface area, can effectively reduce the volume expansion of the negative electrode material in the charge-discharge process of the battery, keeps the electrode structure stable, is applied to the lithium ion battery, and is beneficial to improving the charge-discharge capacity and cycle stability of the battery.

The invention relates to the technical field of quartz sand purification, in particular to a high-purity quartz sand purification method and equipment. 2, a magnetic separation stage; 3, an acid leaching stage; 4, an ultrasonic-assisted cleaning stage; 5, a high-temperature chlorination treatment stage; according to the quartz sand purification method, various impurities such as magnetic impurities, non-magnetic metal impurities and silicate impurities in the quartz sand can be deeply removed through the synergistic effect of multiple steps such as pretreatment, magnetic separation, acid leaching, ultrasonic-assisted cleaning and high-temperature chlorination treatment, the purity of the quartz sand reaches 99.999% or above, the strict requirements of high-end fields such as semiconductors and photovoltaics are met, and the method is suitable for industrial production. The purification steps are closely linked to form a modular purification process, and meanwhile, advanced technologies such as ultrasonic-assisted cleaning and high-temperature chlorination treatment are adopted, so that the impurity removal efficiency is remarkably improved, the purification time is shortened, and the energy consumption and the use amount of chemical reagents are reduced by optimizing the process and equipment.

The invention discloses a preparation method based on hollow double-shell nanofiller and application of the hollow double-shell nanofiller in preparation of a transparent heat-insulating coating, and belongs to the field of heat-insulating coatings. The preparation method comprises the steps that firstly, PMMA-coated TiO2 core-shell sphere powder is prepared; ultrasonically dispersing the prepared PMMA-coated TiO2 core-shell sphere powder into an aqueous solution of isopropanol, and adding acetic acid to adjust the pH value, so as to prepare a core-shell sphere PMMA-coated TiO2-coated SiO2; calcining the core-shell sphere PMMA (at) TiO2 (at) SiO2 to prepare a TiO2 (at) SiO2 sphere with a double-shell hollow structure; the preparation method comprises the following steps: mixing waterborne polyurethane, a solvent, a thickening agent, a curing agent, an auxiliary agent and DHTS, standing, and discharging bubbles to prepare the hollow double-shell nanofiller. The hollow double-shell nanofiller disclosed by the invention can realize the effects of high transmittance, heat insulation and fog prevention.

The invention relates to a hollow silicon dioxide microsphere and a preparation method and application thereof, the hollow silicon dioxide microsphere has a dielectric constant less than or equal to 2.5, a dielectric loss tangent angle less than or equal to 0.001, a purity greater than 95%, a sphericity rate greater than or equal to 99%, a wall thickness greater than 0 and less than or equal to 0.42 [mu] m, and an average diameter of 0.1 [mu] m-5 [mu] m, and the hollow rate, the wall thickness and the average particle size satisfy a relational expression, eta is the hollow rate, t is the wall thickness, and R is 1 / 2 of the average particle size. The hollow silicon dioxide microspheres provided by the invention are high in spherical rate, firm in wall thickness, uniform in particle size distribution, high in purity, relatively excellent in dielectric property and extremely low in content of metal impurities, and can meet the application requirements of high-speed and high-frequency substrates, in addition, the preparation method provided by the invention is few in adopted raw materials, simple in preparation process, low in cost and high in efficiency.

The invention relates to a rotary distributed quartz sand high-temperature chlorination furnace which comprises a chlorination furnace body, a gas conveying pipe, a rotating device, a heating body, a furnace shell and a bracket, the upper end of the chlorination furnace body is externally connected with a temperature measuring galvanic couple, a gas pressure sensor and a feed port, the lower end of the chlorination furnace body is externally connected with an exhaust port and a discharge port, the inner wall of the chlorination furnace body is provided with a baffle, and the periphery of the chlorination furnace body is provided with a heating body, a furnace shell and a bracket; the gas conveying pipe enters the chlorination furnace body from the lower end of the chlorination furnace body and is close to the upper end; two gas outlets are formed in the top end of the gas conveying pipe. The chlorination furnace body is installed in the furnace shell in an inclined mode and can be driven by the rotating device to rotate slowly so as to drive quartz sand to slide from top to bottom in the furnace, and continuous high-temperature chlorination treatment on the quartz sand is achieved; the baffles on the inner wall of the furnace body can effectively disperse the quartz sand, increase the contact area and reaction time of the quartz sand and the chlorinating agent, fully remove the content of alkali metal impurities and improve the purity of the quartz sand. And the structure is sealed, so that the requirement of the quartz sand chlorination reaction on the pressure in a specific range can be met.

This invention belongs to the field of polymer material reinforcement and toughening, specifically relating to a spiked-mesoporous silica nanosphere, its preparation method, and its application in polymer material reinforcement and toughening. The basic steps for synthesizing this spiked-mesoporous silica nanosphere include: firstly, synthesizing low-crosslinked, smooth-surfaced mesoporous silica nanospheres through an oil-water two-phase reaction system; subsequently, inducing normal shrinkage of the pore walls through secondary deep crosslinking to form a rigid nanospike surface structure while maintaining the original mesoporous structure. This spiked-mesoporous silica nanosphere exhibits good monodispersity, high particle size uniformity (50-100 nm adjustable), centrally divergent mesopores with high pore size uniformity (6-8 nm adjustable), highly open pores on the sphere surface, and spike height adjustable from 3-5 nm. This material is suitable for reinforcing and toughening various elastomers, resins, and other polymer materials, effectively overcoming the "strength-toughness mutual exclusion" problem and synergistically enhancing existing mechanical property reinforcement systems.