10 results about "Alkali activated" patented technology

This invention belongs to the field of inorganic non-metallic materials technology, and specifically relates to a low-carbon, high-iron sulfoaluminate cementitious material based on steel slag solid waste. It comprises the following raw materials in parts by weight: limestone 35-55 parts, anhydrite 10-20 parts, bauxite 20-45 parts, modified steel slag A 8-15 parts, and modified steel slag B 5-10 parts. Modified steel slag A is activated by acid / alkali, doped with calcium fluoride / sodium sulfate / titanium dioxide and calcined, and then in-situ co-precipitated to introduce magnesium aluminum spinel nanocrystals. This is used for raw material calcination, which can reduce the calcination temperature, refine the clinker grains, and improve early strength. Modified steel slag B is activated by acid / alkali, doped and calcined, and coated with silane coupling agent / polyvinyl alcohol / silica ball milling. It is incorporated as a blending material to improve the interface, slow-release hydration, and improve later-stage strength. This invention achieves high-value utilization of steel slag through synergistic modification, and the cementitious material has advantages such as low carbon content, early and high strength, suitable setting time, and excellent stability.

The present application relates to water treatment and electrochemical separation technical field, disclose a kind of lanthanum-chitosan composite membrane modified carbon-based electrode and its preparation method and electric field auxiliary deep phosphorus removal method, the carbon-based electrode includes carbon-based substrate and the lanthanum-chitosan composite membrane layer covered on its surface, lanthanum species in composite membrane layer and chitosan matrix synergistically provide selective binding site to phosphate.The preparation method includes: substrate cleaning and alkali activation, lanthanum salt and chitosan solution are mixed and ultrasonic dispersion, fractionally drop coating load, vacuum drying film and hot pressing / light pressure densification.The electrode is used as anode, unmodified carbon cloth as cathode to construct flow-by CDI device, and under the condition of circulating flow, external voltage can be applied, minutes level rapid deep phosphorus removal can be realized under high chlorine background, and it has reversible regeneration performance, and removal rate is close to 100%.

A method of producing concrete, including mixing natural pozzolan and an activator including sodium silicate and brine sludge to form an alkali activated binder; and mixing a coarse aggregate and a fine aggregate with the activated alkali binder to form the concrete, where a density of the brine sludge is about 100 kg / m3, a ratio of the sodium silicate to the brine sludge is about 2.5 to 1 by mass, and an oxide composition of the brine sludge comprises 15-20 wt % CaO, 2-6 wt % MgO, 0.5-2 wt % SrO, 0.5-2 wt % Fe2O3, 0.5-1.5 wt % SiO2, 0-0.5 wt % SO3, 12-18 wt % Na2O, 7-10 wt % BaO, 2-5 wt % Al2O3, 0.25-1 wt % K2O, and 5-10 wt % Cl, and a loss on ignition of 35-45 wt %. An alkali activated binder, including: natural pozzolan; and an alkali activator including sodium silicate and brine sludge. A concrete, including: the alkali activated binder; coarse aggregate; and fine aggregate.

A device for recovering and reusing alkali steam from an alkali-activated rotary kiln belongs to the field of thermal equipment technology. The inlet of the mixing tank is connected to the tail gas pipe of the rotary kiln, used to transport the tail gas. The feed end of the mixing tank is connected to the raw material silo. The mixing tank is used to mix the raw materials and tail gas, recovering alkali from the tail gas. The outlet of the mixing tank is connected to the feed end of the drying equipment through a mixing circuit. The outlet of the drying equipment is connected to the feed port of the rotary kiln's furnace head, sending the mixture to the rotary kiln for activation. A mixing slurry conveying pump is installed on the mixing circuit. This invention introduces the tail gas generated by the rotary kiln into the mixing tank, where it mixes and reacts with the new raw materials from the raw material silo, effectively recovering and utilizing the alkali. Simultaneously, the preheating generated during the operation of the rotary kiln is used as a heat source for the drying equipment, successfully solving the problem of alkali recovery and utilization in the tail gas of the process of preparing porous carbon using an alkali activation rotary kiln.

This invention discloses the preparation and application of halloysite composite nanomaterials based on electrostatic adsorption of cationic surfactants, belonging to the field of nanomaterial surface modification technology. In this invention, a quaternary ammonium polyether cationic surfactant is stirred with alkali-activated halloysite nanotubes in an aqueous phase. The surfactant is loaded onto the outer surface of the halloysite nanotubes through electrostatic adsorption. After separation, washing, and drying, the halloysite composite nanomaterial modified with electrostatic adsorption cationic surfactant is obtained. The alkali activation treatment of the halloysite nanotubes enhances the negative charge on their outer walls, enabling the quaternary ammonium polyether cationic surfactant to be efficiently and stably loaded onto the outer walls of the halloysite nanotubes (HNTs) through electrostatic adsorption, forming a well-defined inorganic reverse micelle composite nanomaterial. The resulting composite nanomaterial exhibits good interfacial activity and emulsifying properties, and can efficiently stabilize Pickering emulsions, expanding its application prospects in the field of emulsion catalysis.

The application relates to the technical field of advanced carbon material synthesis, and particularly discloses a method for preparing high specific surface area porous carbon material based on pitch and silicon source compounding and application thereof. The method comprises the following steps: dissolving pitch, mixing the pitch with a condensate and silicate, and obtaining a hybrid precursor through a solvothermal reaction; and then performing oxidation stabilization, segmented carbonization and alkali activation treatment in sequence to obtain the porous carbon material. The condensate is prepared by the following steps: reacting cyanuric chloride with 3-aminopropyl triethoxysilane, and then co-hydrolyzing and condensing the resultant with phenyltrimethoxysilane, and the condensate contains active silicon hydroxyl groups and phenyl groups, and can effectively control the pore structure of the material. The application significantly improves the interface compatibility of pitch and inorganic silicon source, realizes the molecular-level uniform dispersion of organic and inorganic components and in-situ nitrogen doping, the prepared carbon material has ultrahigh specific surface area and developed hierarchical pore structure, and exhibits excellent electrochemical performance, and has wide application prospects in the field of energy storage device electrode materials.

A method is provided for determining a mix proportion of an alkali activated concrete, AAC, mixture for a set of desired physical properties of the AAC, and for a dry bulk volume of one or more coarse aggregates and a fine aggregate per unit volume of AAC. The method includes determining (202) a mix proportion of an alkali activated paste, AAP, mixture from the set of desired physical properties of the AAC based on a predetermined relationship (210) between the set of desired physical properties of the AAC and the mix proportion of the AAP mixture. The AAP mixture has one or more precursors, one or more chemical compounds of an alkali activator, and water according to the determined mix proportion of the AAP. The method further includes determining (203) masses (261, 262) of the respective one or more coarse aggregates per unit volume of AAC and a mass (263) of the fine aggregate per unit volume of AAC by packing (230, 240, 250) particles of the respective aggregates (231, 241, 251) within the dry bulk volume (234) according to a particle packing model. The method further includes determining (204) a mass of the AAP mixture per unit volume of AAC to complete a remaining volume within the unit volume.

This invention provides an alkali-activated synergistic nitrogen-phosphorus co-doped porous biomass hard carbon material, its preparation method, and its application. This invention only requires mixing pre-carbonized biomass material, an activator, and a dopant, followed by calcination under an inert atmosphere to obtain a porous hard carbon material. Then, the porous hard carbon material is calcined again under an inert atmosphere to obtain the alkali-activated synergistic nitrogen-phosphorus co-doped porous biomass hard carbon material. This simple and effective method achieves the stepped pore design and nitrogen-phosphorus doping of the hard carbon material, and the obtained nitrogen-phosphorus co-doped porous hard carbon material exhibits high specific capacity and initial coulombic efficiency.