12 results about "Carbothermic reaction" patented technology

According to the red mud-based composite material and the preparation method and application thereof, bentonite, red mud and biomass are mixed in a proper amount of water according to the mass ratio of 1: 1: (1-10), and first suspension liquid is formed; drying the first suspension to obtain a precursor of the red mud-based composite material; the precursor is subjected to a carbon thermal reaction at 300-700 DEG C, ferric oxide in the red mud is converted into zero-valent iron, and the red mud-based composite material is obtained. The red mud is alkaline and promotes manganese ions to form insoluble precipitates, the unique structure and ion exchange capacity of the bentonite can effectively solidify the manganese ions, the biomass has a high specific surface area and a developed pore structure, and the manganese ions are physically adsorbed through Van der Waals' force and pore interception; ferric oxide in the red mud is converted into zero-valent iron in the carbothermal reaction process, and the zero-valent iron can catalytically oxidize ammonia nitrogen, so that the red mud-based composite material synchronously solves the problem of combined pollution of manganese and ammonia nitrogen in the soil.

A method for recovering materials from waste or scraps through an improved microwave carbothermal process involves combining reagents of a carbothermal reaction to form a mixture to be subjected to heat treatment, the reagents including a component in which an element to be recovered is contained and a carbon-containing component, the component being contained within a waste material, placing the mixture in a crucible, placing the crucible in a refractory chamber having a side wall, a surface of the side wall being covered by a layer of microwave-sensitive material, and inserting the refractory chamber into a microwave oven. The carbothermal reaction is obtained in less time and with lower electricity consumption compared to typical carbothermal reactions.

In various aspects, methods of making a silicon carbide or silicon nitride from rice hull ash (RHA) byproduct are provided. A treated silica depleted rice hull ash product (SDRHA) comprising silicon oxide at ≤about 65% by weight and carbon ≥about 35% by weight may be heated in an environment free of any additional carbon sources, but in an inert atmosphere, having a temperature of ≥about 1,200° C. to ≤about 1,700° C. for a carbothermal reaction that forms a product (e.g., nanocomposite product) comprising at least one of silicon carbide (SiC), silicon nitride (Si3N4), and silicon oxynitride (Si2N2O or non-stoichiometric SiNxO4-x, where x ranges from greater than 0 to less than 4). A negative electroactive material is also provided that includes silicon oxynitride (Si2N2O), which may be used in a lithium ion battery.

The invention provides a preparation method of flaky aluminum nitride, which comprises the following steps: a paste preparation process: mixing and dispersing nano aluminum oxide powder, modified cellulose and an organic solvent to obtain pre-dispersed paste; a carbon-containing porous body preparation step for obtaining a carbon-containing porous body by subjecting the pre-dispersed paste to a first heat treatment; a carbon thermal reduction step of performing carbon thermal reduction treatment on the carbon-containing porous body in a nitrogen atmosphere to obtain carbon-containing aluminum nitride; and a decarburization process: performing decarburization treatment on the carbon-containing aluminum nitride to obtain sheet-shaped aluminum nitride. The nano aluminum oxide powder, the modified cellulose and the organic solvent are prepared into the paste, and the flaky aluminum nitride can be prepared on a large scale with a simple process flow and relatively low cost through gradual carbonization and carbon thermal reaction.

Systems and methods for making ceramic powders are provided. In some embodiments, a method for forming a ceramic powder includes: adding a sufficient amount of additives to a plurality of reagents to form a precursor mixture so that when the precursor mixture is carbothermically reacted the precursor mixture forms a ceramic powder, wherein the additive includes at least one of: an oxide, a salt, a pure metal or an alloy of elements ranging from atomic numbers 21 through 30, 39 through 51, and 57 through 77 and combinations thereof; and carbothermically reacting the precursor mixture to form a ceramic powder, wherein the ceramic powder comprises: a) a morphology selected from the group consisting of irregular, equiaxed, plate-like, and combinations thereof, and b) a particle size distribution selected from the group consisting of fine, intermediate, coarse, and combinations thereof.

The present invention discloses a method for removing silicon dioxide from the surface of silicon powder cut by diamond wire cutting, which is specifically implemented according to the following steps: step 1, filter the waste material cut by diamond, vacuum dry the solid obtained by filter pressing to obtain a dry sample, weigh the carbon precursor and the dry sample and mix them in deionized water or ethanol, and place the mixed solution in a water bath stirring pot for pre-curing, dry it after pre-curing, grind and sieve it to obtain an initial sample; step 2, place the initial sample obtained in step 1 in a high-temperature heating device for heating and heat preservation, pyrolyze the carbon precursor into amorphous carbon and coat it on the initial sample, and then heat it to a preset temperature for heat preservation, remove silicon dioxide, and obtain pure silicon powder. The method for removing silicon dioxide from the surface of silicon powder cut by diamond wire cutting of the present invention uses a carbon precursor to provide a carbon source, forms a coating layer on the surface of silicon powder, and removes silicon dioxide by carbon thermal reaction to obtain pure silicon powder.

The invention provides a high-thermal-conductivity double-sided adhesive tape and a preparation method thereof. The double-sided tape comprises a base material, a glue layer and a release layer, wherein raw materials of the glue layer comprise matrix resin, a curing agent and modified ceramic powder; the modified ceramic powder is metal element multiphase ceramic reinforced by a carbon material. According to the modified ceramic powder disclosed by the invention, compact ceramic powder is obtained by utilizing a sol-gel method and a carbon thermal reaction method, and the compact ceramic powder is high in crystallinity, few in defect and excellent in heat conduction effect; and through carbon material surface modification, the compatibility with matrix resin containing a benzene ring structure can be improved while the conductive effect is further improved, so that the connection between the modified ceramic powder and the resin matrix is stronger, and the modified ceramic powder is uniformly dispersed in the matrix resin.

The invention provides a CO2 / H2O directly-heated biomass carbonization / activation method and equipment thereof, and relates to the technical field of resource circulation, the equipment comprises a preheating section, a carbonization / activation section, a material sealing section and a coke quenching section, and the carbonization / activation section is connected with an oxygen-enriched combustion device through a hot air pipe. The invention also provides a method which comprises the following steps: adding biomass granules into the preheating section; introducing a gas heat carrier to carry out a directly-heated carbonization reaction, wherein the gas heat carrier is a mixed gas of gaseous CO2 and H2O; and collecting the mixed product gas and the active coke. According to the method disclosed by the invention, CO2 / H2O (g) is taken as a heat carrier to construct a biomass directly-heated carbonization / activation system, and the generation of a C vacancy of a biological coke / carbon surface interface is promoted through a carbon thermal reaction, a water gas shift reaction and the like, so that the pore growth is promoted, the specific surface area and the activity are improved, the heat transfer efficiency and the carbonization efficiency are improved, and the emission of carbon dioxide is reduced.

The application relates to the field of sodium ion batteries, and discloses a preparation method of hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires and application thereof. The application takes NTA as a metal ion chelating agent, chelates zinc ions and iron ions through a solvothermal reaction, and prepares a ZnFe-NTA precursor; the precursor is pyrolyzed at high temperature under an inert atmosphere, metal ion reduction is induced through a carbon thermal reaction, low-boiling-point zinc particles are volatilized, nitrogen-doped carbon formed through in-situ conversion of an organic ligand is combined, and a hierarchical porous structure is generated; finally, a gas-phase sulfuration method is adopted to form Fe7S8, and the hierarchical porous Fe7S8 / nitrogen-doped carbon composite nanowires are obtained. When the composite nanowires are used as a negative electrode of a sodium ion battery, the hierarchical porous structure can effectively promote full infiltration of electrolyte and rapid migration of sodium ions, and can improve cycle stability and rate performance.

The invention discloses a reaction device for preparing NiP binary alloy through carbon thermal rapid reduction, and relates to the field of carbon thermal reduction devices.The reaction device comprises a reaction tank, a feeding pipeline is arranged in the reaction tank and distributed on the inner circle of the reaction tank by a circle in a spiral structure, the upper end of the feeding pipeline communicates with a feeding pipeline, and the lower end of the feeding pipeline communicates with a discharging pipeline; a feeding main pipe is arranged on the feeding pipeline and is used for being connected with a material pump for pumping a mixture into the reaction tank. The feeding pipeline is of a spiral structure, a mixture is preheated along the spiral channel before entering the reaction tank, the carbon thermal reaction efficiency is further improved, the mixing degree of the mixture can be improved, the silicon carbide rod heating plate is adopted, the temperature in the reaction tank can be rapidly increased to 800 DEG C, and the reaction time is remarkably shortened.

This invention provides a method for preparing flake-shaped aluminum nitride. The method includes: a paste-making step, in which nano-alumina powder, modified cellulose, and an organic solvent are mixed and dispersed to obtain a pre-dispersed paste; a carbon-containing porous body preparation step, in which the pre-dispersed paste is subjected to a first heat treatment to obtain a carbon-containing porous body; a carbothermal reduction step, in which the carbon-containing porous body is subjected to carbothermal reduction treatment under a nitrogen atmosphere to obtain carbon-containing aluminum nitride; and a decarburization step, in which the carbon-containing aluminum nitride is decarburized to obtain flake-shaped aluminum nitride. By preparing nano-alumina powder, modified cellulose, and an organic solvent into a paste, and through stepwise carbonization and carbothermal reaction, flake-shaped aluminum nitride can be prepared on a large scale, with a simple process flow and low cost.