3448results about "Silica" patented technology

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.

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 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 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 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 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 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 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, 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.

The invention belongs to the field of lithium battery negative electrode materials, and particularly relates to a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material and a preparation method and application thereof. The silicon-based negative electrode material comprises RGO with a three-dimensional skeleton structure and TiO2 (at) SiO (at) Si particles compounded on the RGO, each TiO2 (at) SiO (at) Si particle comprises a Si inner core, a SiO layer coated on the surface of the Si inner core and a TiO2 layer coated on the surface of the SiO. The preparation method is characterized in that a TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is designed and synthesized, SiO and TiO2 double-layer coating is carried out on a Si core in sequence, and TiO2 (at) SiO (at) Si particles are uniformly compounded on RGO with a three-dimensional skeleton structure, so that the TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material with a specific structure is obtained. The obtained TiO2 (at) SiO (at) Si / RGO silicon-based negative electrode material not only can effectively inhibit volume expansion when the silicon-based negative electrode material is applied to a lithium ion battery, but also is beneficial to promoting electron transfer, so that the rate capability, the first effect performance and the cycle performance of the silicon-based negative electrode material are improved.

The invention discloses a lithium slag composite admixture, low-carbon lithium slag concrete and a preparation method thereof, and belongs to the technical field of concrete. The method comprises the following steps: preparing calcium type lithium slag synthetic zeolite from lithium slag; waste liquid generated in the preparation process of synthesizing zeolite from the calcium-type lithium slag is used for preparing lithium slag-based negative calcium mesoporous silicon dioxide; and finally, mixing the calcium type lithium slag synthetic zeolite, the lithium slag-based negative calcium mesoporous silica and the original lithium slag to obtain the composite admixture. The problem that the content of SO3 in the lithium slag concrete is too high under the large mixing amount is solved, meanwhile, the technical defects that the activity of the lithium slag is insufficient and the concrete strength is low are overcome, the cracking risk of the lithium slag concrete is effectively reduced, the compactness and the working performance of the lithium slag concrete are comprehensively improved, and high-added-value resource utilization of the lithium slag solid waste is achieved.

The invention relates to a method for preparing high-purity quartz sand by burning organic silicon as a raw material, and belongs to the technical field of synthesis of quartz sand. The method comprises the following steps: introducing purified organic silicon into a combustor, and combusting to obtain nano silicon dioxide powder; then sintering is carried out to remove moisture, hydroxyl and carbon impurities on the surface of the powder, sintered silicon dioxide powder is obtained, and acid leaching and cleaning are carried out to remove metal impurities on the surface and in the powder; roasting the cleaned silicon dioxide powder in a chlorine atmosphere to remove moisture, hydroxyl and residual metal impurities; and carrying out high-temperature densification treatment on the roasted silicon dioxide powder, and then crushing, grinding and screening to obtain the high-purity quartz sand. The particle size of the prepared high-purity quartz sand ranges from 50 micrometers to 300 micrometers, the purity is larger than or equal to 99.999%, and the apparent density is larger than or equal to 2.1 g / cm < 3 >. The method breaks through the limitation of natural mineral purification, and provides a brand new path for large-scale production of high-added-value quartz sand.

[Problem] To provide: metal oxide particles that can be highly concentrated in an organic solvent, which is a dispersion medium for a metal oxide sol, and can also be redispersed in the organic solvent; a metal oxide sol containing the metal oxide particles; and a method for producing same. [Solution] Metal oxide particles surface-coated with a hydrolysate of a silane compound (A) having two chemical groups (a1) and two hydrolyzable groups (a2), wherein the metal oxide particles contain a basic compound (I) (excluding ammonia), have a hydrophobicity of 30-80 vol% as measured by a methanol titration method, and can be dispersed at a particle refractive index of 1.4-3.0 and at a metal oxide concentration of at least 40 mass% in an organic solvent, or can be dispersed at a particle refractive index of at least 1.1 and less than 1.4 and at a metal oxide concentration of at least 25 mass% in an organic solvent.

The invention discloses a modified mesoporous silica adsorbent as well as a preparation method and application thereof, and relates to the technical field of porous material preparation. The preparation method of the modified mesoporous silica adsorbent provided by the invention comprises the following steps: hydrolyzing a silicon source in a solution containing a template agent to form a preliminary framework of silica, then adding a silane coupling agent containing at least one of sulfydryl, sulfonyl and amino, carrying out a hydrothermal reaction at 60-120 DEG C, and removing the template agent to obtain the modified mesoporous silica adsorbent. The modified mesoporous silica adsorbent capable of selectively adsorbing zirconium and hafnium can be obtained. The modified mesoporous silica adsorbent prepared by the method is used for adsorbing and enriching zirconium and hafnium ions, the adsorption capacities of 6.23 mg / g and 5.95 mg / g or above can be obtained respectively, the adsorption capacity is excellent, and the adsorbent can reach adsorption equilibrium within 10 min and is excellent in adsorption rate.

The invention discloses acid-resistant calcium carbonate and a preparation method thereof, and belongs to the technical field of calcium carbonate filler production. According to the invention, industrial waste carbide slag is used as a calcium source, and calcium hydroxide slurry is obtained through impurity removal; then adding sodium polyacrylate and sodium hexametaphosphate, stirring and dispersing, then introducing carbon dioxide for carbonization, adding a surfactant for ultrasonic activation after carbonization, and finally sequentially adding zirconium oxychloride and sodium silicate to prepare the acid-resistant calcium carbonate. The defects of traditional silicon dioxide and titanium dioxide coated calcium carbonate products are overcome, the prepared calcium carbonate product is compact and uniform in coating layer and good in stability, meanwhile, excellent acid resistance and mechanical property are considered, the calcium carbonate can be suitable for more acid environments, and the application range of calcium carbonate is effectively widened.

The invention relates to the technical field of optical materials, and discloses organic silicon micropowder as well as a preparation method and application thereof. The organic silicon micro powder is composed of a plurality of polysiloxane microspheres, the surface relative smoothness of each polysiloxane microsphere is R, 1.02 < = R < = 1.30, R = Rq / Ra, Rq is the root mean square surface roughness of the polysiloxane microspheres, and Ra is the average surface roughness of the polysiloxane microspheres; the relative size uniformity of the organic silicon micro-powder is RSU, RSU = 1-phi / d2 > = 0.992, phi is the variance of the diameter of the organic silicon micro-powder, and d is the average diameter of the organic silicon micro-powder. The organic silicon micropowder has the advantages of higher light utilization rate, higher light transmittance and good light scattering and diffusion uniformity; after the material is applied to a light diffusion material, the light control fineness is high, the light transmittance and diffusivity are good, and the light transmittance and brightness are higher; and the flatness of the coating formed when the coating is used as a raw material for forming the coating is good.

The invention relates to the technical field of silicon dioxide surface modification, in particular to a silicon dioxide hollow sphere with an MOF composite layer, a manufacturing method and a dielectric loss prediction method. The silicon dioxide hollow sphere comprises a hollow spherical structure formed by silicon dioxide, an amino silane layer grafted on the surface of an inner core layer through a covalent bond, a ZIF-8 crystal layer growing in situ by taking amino as a nucleation site, and thiol groups distributed on the outer surface of an MOF crystal. According to the silicon dioxide hollow sphere with the MOF composite layer, the manufacturing method and the dielectric loss prediction method, the silicon dioxide hollow sphere with the MOF composite layer has good compatibility and stability in an LCP matrix, the dielectric loss is small, and the performance of a high-frequency FPC is effectively improved.

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention discloses a preparation method of low-carbon-content high-purity quartz sand, which comprises the following steps: carrying out alkaline hydrolysis and drying on organosilane to obtain alkaline xerogel, putting the alkaline xerogel into a quartz tube of a rotary tube furnace, starting the furnace body, adjusting the rotation rate, heating to a specific low temperature, and introducing nitrogen to replace air; introducing oxygen, controlling the pressure, carrying out oxidation reaction, relieving the pressure to normal pressure after the reaction, pumping and discharging the product, and repeating the oxidation and pumping steps for many times until the tail gas carbon dioxide reaches the standard; raising the temperature, introducing chlorine-containing gas for purification, finally raising the temperature to a sintering temperature, and sintering in an air atmosphere to obtain the low-carbon-content high-purity quartz sand. According to the preparation method, the energy consumption and the equipment cost of the carbon removal procedure are greatly reduced, the specific surface area and the densification performance of the subsequent high-purity quartz sand product can be guaranteed, and a technical path which is low in energy consumption, high in efficiency and capable of giving consideration to the product performance is provided for industrial preparation of the high-purity quartz sand through a sol-gel method.

The invention relates to the technical field of microsphere materials, in particular to microspheres and derivatives thereof, including phenolic resin-based hollow mesoporous carbon materials (hollow mesoporous carbon microspheres) and core-shell silicon dioxide microspheres as well as a preparation method and application thereof. The preparation method of the microspheres comprises the step of reacting resorcinol and aldehyde in a solvent in the absence of a surfactant in a system by taking ammonia water as a basic catalyst, when the molar ratio of the reaction amount of the aldehyde to the resorcinol is (0.5-1): 1, adding tetraethyl silicate to obtain microspheres; and carbonizing the microspheres and removing the silicon dioxide to obtain the phenolic aldehyde-based hollow mesoporous carbon microspheres. The preparation method provided by the invention can be used for preparing the hollow large mesoporous carbon microspheres under the reaction condition of no surfactant.