835results about "Silicon oxides" patented technology

A method for extracting silicon dioxide, alumina and gallium oxide from high-alumina fly ash relates to the technology fields of environmental mineralogy and material, chemical industry and metallurgy. The method comprises the main steps as follows: causing the high-alumina fly ash to react with sodium hydroxide solution; filtering the solution; introducing CO2 to the filtrate for full gelation; cleaning, purifying, drying, grinding and calcining the silica gel after gel filtration to obtain finished white carbon black; adding limestone and a sodium carbonate solution into the filter mass after the reaction and filtration of the high-alumina fly ash and the sodium hydroxide solution; ball grinding the mixture into raw slurry; dissolving out the clinker obtained by baking the raw slurry; subjecting the filtrate to deep desiliconization to obtain sodium aluminate extraction liquid; filtrating the sodium aluminate extraction liquid after subjecting the sodium aluminate extraction liquid to carbon dioxide decomposition; baking the aluminum hydroxide after washing the filter mass to form the aluminum hydroxide product; and extracting the gallium oxide from the carbon dioxide decomposition mother solution and desiliconized solution. The method has the advantages of low material price, simple operating procedures, low investment, low production cost, low energy consumption and less slag.

Silicon oxide based anode active materials are provided. In one embodiment, the active materials include silicon oxides represented by the general formula SiO_x, where 0<x<0.8. The anode active materials include silicon oxides having low oxygen contents. Further, anodes and lithium batteries employing such anode active materials have excellent charge-discharge characteristics.

An object is to suppress electrochemical decomposition of an electrolyte solution and the like at a negative electrode in a lithium ion battery or a lithium ion capacitor; thus, irreversible capacity is reduced, cycle performance is improved, or operating temperature range is extended. A negative electrode for a power storage device including a negative electrode current collector, a negative electrode active material layer which is over the negative electrode current collector and includes a plurality of particles of a negative electrode active material, and a film covering part of the negative electrode active material. The film has an insulating property and lithium ion conductivity.

The invention relates to block-copolymeric polyalkylene oxides containing styrene oxide, obtained by alkoxylation, and their use as low-foam pigment wetting agents in aqueous pigment pastes with or without cosolvent and in aqueous and low-solvent coating materials and printing inks.

The invention discloses a clean producing craft of aluminum oxide and white carbon black comprehensively with high-alumina coal ash, which comprises the following steps: making sodium carbonate as raw material; disintegrating high-alumina coal ash under medium-temperature; generating acid dissoluble aluminosilicate materials; using dilute sulphuric acid to acid dip; separating aluminum oxide and silica in the high-alumina coal ash; further treating aluminous liquid part; generating hydrated alumina deposition; finishing gamma-alumina or alpha- alumina product through calcining; washing, purifying, drying; calcining the silica gel part; getting white carbon black, silica aerogel, ultra-fine silica, porous silica and so on inorganic silicide.

The invention relates to a method to withdraw silicon and aluminum in sequence from coal ash; a NaOH solution with a mass concentration larger than 40 percent is used for leaching the coal ash, the silicon of the coal ash is dissolved in the form of sodium silicate, and after being separated, sodium silicate solutions and alkaline leaching residues with a ratio between aluminum and silicone more than or equal to 2 are produced; the dissolved sodium silicate solution is condensed into sodium silicate solutions of different concentrations, or used for preparing white carbon through a carbonation method; the alkaline residues are used for producing Al(OH)3 through a sodalime sintering method or limestone sintering method and further producing Al2O3, and the residues after the aluminum being extracted are made into stuff or used for producing concrete. The invention breakthroughs the original idea of directly extracting Al2O3 from the coal ash, and adopts the wholly novel technical route of extracting silicon first and aluminum secondly, thereby enhancing the aluminum silicon ratio of the alkali leached residues, simplifying the technique of extracting Al2O3, and increasing the extracting rate of aluminum from the coal ash.

Embodiments of the present invention are directed to a substrate for performing ionization desorption on porous silicon, methods for performing such ionization desorption and methods of making substrates. One embodiment directed to a substrate for performing ionization desorption on silicon comprises a substrate having a surface having a formula of:

As used above, X is H or Y, where at least at least twenty five mole percent of X is Y and Y is hydroxyl, or —O—R₁, or O—SiR₁, R₂, R₃ wherein R₁, R₂, and R₃ are selected from the group consisting of alkyl, alkenyl, alkynyl, aromatic, amino alkyl, amino alkenyl, amino alkynyl, pyridinyl, pyrridonyl, and carbonyl, alcohol and carboxylic acid derivatives thereof having one to twenty five atoms, and hydroxyl, amino, amide, carboxyl, ester, carbonyl, sulfhydryl, sulfonyl, phosphoral, bromo, iodo, chloro and fluoro derivatives. The letter “n” represents an integer from 1 to infinity and any vacant valences are silicon atoms, hydrogen or impurities.

This invention discloses a method for extracting SiO2 and Al2O3 from fly ashes. The method comprises: activating fly ashes, leaching with more than 40 wt. % NaOH solution so that Si is stripped out in the form of sodium cilicate, introducing CO2 to prepare SiO2, adding CaO or CaCO3 into the leaching residue, calcining to obtain a clinker, preparing Al2O3 by Bayer method, and preparing cement from the waste residue. The method extracts Si at first, thus increasing the Al/Si ratio in the leaching residue. Treated leaching residue can be directly subjected to Bayer method to extract Al2O3, which largely simplify Al2O3 extraction process and increase Al2O3 utility. The method has such advantages as simple process, low investment, and high product added value.

A negative active material for a rechargeable lithium battery with a composite phase particle has a chemical formula, SiO_x, where 0<x<1. The material comprises a first crystalline phase of Si nano-grains, and a second phase of non-crystalline SiO₂, where the composite phase particle has a Si-phase peak of 150 to 480 cm⁻¹ according to Raman spectroscopic analysis.

An emulsion coagulant for coagulating a tire puncture sealant containing emulsion particles includes a mineral which induces aggregation of the emulsion particles by one or both of weakening of surface charge of the emulsion particles and formation of hydrogen bond between the mineral and the emulsion particles, and a gelation agent. The emulsion coagulant enables easy recovery of the tire puncture sealant from a tire as well as easy disposal of the recovered sealant.

The process of preparing white carbon black and pure zeolite molecular sieve with fly ash material belongs to the field of inorganic non-metal material preparing technology. The preparation process includes the following steps: roasting the mixture of high silicon fly ash with SiO2 content of 30-65 % and sodium carbonate in the weight ratio of 1 to 1-1.5 at 830 deg.c for 1 hr to obtain roasted product with sodium silicate and sodium aluminosilicate as main components; soaking the roasted product in water in 5 times to leach out sodium silicate with high water solubility, filtering to obtain sodium silicate solution, introducing CO2 to the solution and depositing to obtain white carbon black product; and further leaching desilicated fly ash with alkali solution, heating and stirring to obtain solution of sodium aluminosilicate, which is soluble in strong alkali solution, filtering, regulating pH value and crystallizing to obtain pure zeolite molecular sieve.

The invention relates to a preparation method for mesoporous silicon oxide hollow microspheres with magnetic nanoparticles embedded in shell layers. In the invention, the magnetic nanoparticles are prepared by using a coprecipitation method, are subjected to oleic acid surface modification and then are dispersed in normal octane; an oil phase constructed by styrene monomer, cetane, normal octane dispersion of the magnetic nanoparticles, alkoxysilane and a silane coupling agent is mixed with a water phase which dissolves a surfactant; a fine emulsion liquid droplet system is obtained through pre-emulsification and fine emulsification processes; controlling formation of silicon oxide and phase separation of organic and inorganic components in the system to obtain a template with a nested structure during free radial polymerization of the liquid droplets by adding a base catalyst; based on the template, generating a raw material by taking long-chain alkyl silane coupling agent and alkoxysilane as mesoporous silicon oxide; performing one-step ablation to remove an inner core of a polymer and a pore forming agent; or by taking a cationic surfactant as the pore forming agent, removing the pore forming agent and the inner core of the polymer through a solvent dissolving method and obtaining the magnetic/mesoporous silicon oxide hollow composite microspheres. The composite microspheres have large specific surface area and good magnetic operability and can be used for application fields of biomedicine, environment, water treatment and the like.

The present invention relates to a method for coproducing alumina, white carbon black and low-ash carbon. Said method is characterized by that it uses the minerals of coal gangue and kaolinite containing different S:O2 and Al2O3 contents as raw material, and makes said raw material be undergone the processes of breaking, beating to make extraction by using sulfuric acid solution and separation so as to obtain aluminium sulfate solution, in the course of extraction and separation small quantity of fluoride as activating agent can be added, then the sulfate as cocrystallization agent is added in said solution, then the above-mentioned material is undergone the processes of concentration and crystallization so as to obtain high-grade alum salt crystal, at the same time the acid mother liquor can be circularly utilized to make next extraction, the residuum can be extracted by alkaline liquor to obtain silicon oxide and recover carbon. Said invention is simple, and the extraction rate of alumina is high, the high-grade aluminium salt can be easily obtained.

The non-aqueous secondary battery of the present invention includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a separator, the negative electrode contains a negative electrode active material containing a graphitic carbon material and a composite in which a carbon coating layer is formed on a surface of a core material containing Si and O as constituent elements, the composite has a carbon content of 10 to 30 mass %, the composite has an intensity ratio I₅₁₀/I₁₃₄₃ of a peak intensity I₅₁₀ at 510 cm⁻¹ derived from Si to a peak intensity I₁₃₄₃ at 1343 cm⁻¹ derived from carbon of 0.25 or less when a Raman spectrum of the composite is measured at a laser wavelength of 532 nm, and the half-width of the (111) diffraction peak of Si is less than 3.0° when the crystallite size of an Si phase contained in the core material is measured by X-ray diffractometry using CuKα radiation.

The invention relates to the use of a composition for injection grouting obtainable by mixing an alkali metal silicate or an organic silicate, colloidal silica particles, and at least one gelling agent, wherein the weight ratio of colloidal silica to silicate is from about 2:1 to about 100:1. The invention also relates to a method of sealing a leaking part or cavity, and method of cutting off a liquid flow in a leaking part or cavity. The invention further relates to a composition for injection grouting and a method for preparing such composition.

The invention relates to a method for preparing silicone rubber by precipitating white carbon black. The method comprises the following steps: (1) raw materials: sodium silicate and dilute sulphuric acid; (2) reaction: firstly, the raw materials are stirred in a reaction kettle, is heated to a temperature between 80 and 90 DEG C; 15 to 20 percent of sulphuric acid is dripped to the reaction kettle within 30 to 45 minutes and the PH value of the sulphuric acid is between 9.5 and 11; secondly, an aqueous solution of the sodium silicate and 15 to 20 percent of the sulphuric acid are simultaneously dripped to the reaction kettle; the reaction time is between 45 and 55 minutes; the PH value is kept unchanged between 9.5 and 11; 15 to 20 percent of the sulphuric acid is continuously added into the reaction kettle within 20 to 35 minutes and is used to adjust the PH value to between 3.0 and 4.0; and a suspending solution is kept at the temperature and is aged for 30 to 60 minutes; (3) the suspending solution is filtered and washed; and (4) the suspending solution is dried to obtain a finished product. The method has the advantages that the produced white carbon black has even particles, good dispersion, and excellent processing performance and reinforcing performance in order that a silicone rubber product has good transparence and excellent anti-yellowing performance.

Novel nanoparticle-coated multilayer shell microstructures are disclosed herein. Some variations of the invention provide a material comprising a plurality of hollow microstructures characterized by an average shortest diameter from about 5 microns to about 1 millimeter, wherein each of the microstructures comprises multiple shells, including at least an inner shell and an outmost shell, with a combined thickness that is less than one-tenth of the average shortest diameter. The inner shell and the outmost shell have different composition. The outmost shell comprises nanoparticles sized between about 10 nanometers to about 500 nanometers, and the nanoparticles each contain an oxide and/or are surrounded by an oxide layer having a layer thickness of at least 1 nanometer. Several microstructure configurations are illustrated in the drawings.

A preparation method of nanospheres with core-shell structure having a shell of silicon dioxide belongs to the nanometer material technology field and comprises the steps of: (1)dispersing magnetic particle or aggregate of magnetic particle and quantum dot particle into alkaline water solution; (2) solving the surface active agent into non-polar solvent; (3)mixing the solution obtained from step (1) with the solution obtained from step (2) with a volume ratio of 1:1000-1:1, and obtaining emulsion or microemulsion by ultrasound or vortex mixing method; (4)adding tetraethoxysilane into emulsion or microemulsion and agitating, wherein, the volume of tetraethoxysilane occupies 0.1~10% of the emulsion volume; (5)centrifuge washing and drying. The nanosphere of the present invention has magnetic response property, or has magnetic response property and photoluminescent property synchronously, and has uniform grain size, besides the preparation method is simple.

A silicon oxide material is obtained by cooling and precipitating a gaseous mixture of SiO gas and silicon-containing gas and has an oxygen content of 20-35 wt %. Using the silicon oxide material as a negative electrode active material, a nonaqueous electrolyte secondary battery is constructed that exhibits a high 1st cycle charge/discharge efficiency and improved cycle performance while maintaining the high battery capacity and low volume expansion of silicon oxide.

The invention belongs to the technical field of nanometer material preparation, and particularly relates to a method for preparing a porous silicon dioxide nanometer sphere with a surface of special structure and appearance in an ether/water system, and the obtained porous silicon dioxide nanometer sphere with the surface of special structure and appearance by the method. When triethoxy silane is hydrolyzed in different ether/water systems and undertakes a dynamic template assembly process under the alkaline condition, the porous silicon dioxide nanometer sphere and a porous silicon dioxide nanometer hollow sphere are respectively obtained. The method has simple preparation process, low cost, mild reaction condition, and controlled prepared material structure and appearance. The prepared porous silicon dioxide nanometer sphere and the porous silicon dioxide nanometer hollow sphere are provided with abundant microporous and mesoporous, larger specific surface area and pore volume as well as good structural stability, and can be used as the carrier of catalyst or adsorbent , drug carrier (controlled release), nanometer reactor and separation material and the like.