84 results about "Alkali activated" patented technology

The invention relates to a cement-based joint mixture and a preparation method thereof, and belongs to the field of joint mixture material preparation, and the cement-based joint mixture comprises cement, fly ash, other alkali activation active materials, an activator, an expanding agent, a mineral thixotropic agent, inorganic fibers, a filler, cellulose ether and rubber powder. The prepared cement-based joint mixture overcomes the technical defects that an existing cement-based joint mixture technology is prone to cracking and falling off, alkali efflorescence and whitewashing are prone to occurring, attractiveness is affected, and the constructability is poor.

The invention provides an alkali-activated gel material as well as a preparation method and application thereof. The alkali-activated gel material is prepared from a composite alkali activator and a solid waste gel material, the composite alkali activator is formed by mixing water glass and NaOH, and the mass ratio of the water glass to the NaOH is 2000: (350-520); the solid waste gel material is formed by mixing iron tailing sand, limestone and fly ash, and the ratio of the total mass of the limestone and the fly ash to the mass of the iron tailing sand is (70-80): (30-40); the mass ratio of the composite alkali activator to the solid waste gel material is (0.32-0.38): 1. The alkali-activated cementing material is prepared by cooperatively treating the iron tailing sand through the limestone and the fly ash, and the alkali-activated cementing material with good mechanical properties can be prepared by regulating and controlling the mass ratio of the raw materials.

The invention belongs to the technical field of low-carbon building materials, and particularly relates to a fly ash-slag-based alkali-activated cementing material as well as a preparation method, a strength regulation and control method and application thereof. The cementing material comprises, by mass, 64%-68% of powder, 21%-30% of a composite alkali activator and 5%-12% of additional water, and in the powder, slag powder accounts for 0-50% of the mass of the powder, and fly ash accounts for 50-100% of the mass of the powder. The initial setting time of the cementing material is larger than or equal to 60 minutes, the 28-day compressive strength is 30.0-100.0 MPa, the breaking strength is 4.0-7.0 MPa, the cementing material has good mechanical performance, meanwhile, the strength of the cementing material can be regulated and controlled through the powder mixing ratio, the regulation and control range is large, the cementing material is suitable for application scenes with different strength requirements, and the cementing material has wide application prospects in the field of civil engineering.

To provide a geopolymer composition capable of improving strength of a cured product.SOLUTION: A geopolymer composition contains an active filler (A), an alkali activator (B), and an aggregate (C). The aggregate (C) contains a first reactive aggregate (C1) having a SiO2 content of 40 mass% or more and a CaO content of 25 mass% or more. The aggregate (C) contains a second reactive aggregate (C2) having a Si ion elution amount of 15 ppm or more and a Ca ion elution amount of 5 ppm or more.SELECTED DRAWING: Figure 1

The invention discloses a green low-carbon cementing material for a roadbed and a preparation method of the green low-carbon cementing material, and belongs to the technical field of low-carbon cementing materials, and the green low-carbon cementing material comprises the following components in parts by weight: 40-50 parts of superfine slag powder, 25-35 parts of self-made functionalized fly ash, 15-25 parts of steel slag powder, 8-15 parts of desulfurized gypsum and 2-4 parts of modified basalt fiber. According to the self-made functional fly ash in the cementing material, the surface inertia of the fly ash is broken through alkali activation, and a large amount of solid waste is applied to the roadbed material which is also widely applied, so that the environmental problem caused by accumulation of the solid waste can be solved, the solid waste is utilized, and the utilization rate of the solid waste is improved. The method also conforms to the green, cyclic and sustainable strategic development direction, and has huge market potential.

When paving a roadbed using a geopolimer paving material containing a geopolimer and a sodium-based alkali activator, the occurrence of various problems caused by sodium components deposited on the paving surface is suppressed. 【Solution means】In step S1, a roadbed is formed. In step S2, a geopolimer paving material containing at least an active filler containing blast furnace slag fine powder and sodium silicate powder as an activator is spread over the roadbed. In step S3, water is sprayed on the surface layer of the geopolimer paving material spread over the roadbed. In step S4, the sodium components deposited on the surface layer of the geopolimer paving material are confirmed. When the sodium components are confirmed, in step S5, an aqueous solution containing a boron-containing compound is sprayed on the surface layer of the geopolimer paving material.

The invention discloses pitch-based spherical capacitor carbon and a preparation method thereof. According to the preparation method, one or a combination of Pluronic F127 and Pluronic P123 is selected as a template agent, the pitch-based spherical capacitor carbon is prepared by adopting a template method and a one-step carbonization and activation method, and the specific surface area and pore size distribution of the pitch-based spherical capacitor carbon are controlled by controlling the use amount of the template agent and activation conditions, so that the pitch-based spherical capacitor carbon is obtained. The problem that the pore structure of capacitor carbon prepared in a traditional process is difficult to regulate and control is solved; asphalt is used as a raw material and is wide in source, low in price and easy to obtain, and the preparation cost of the asphalt-based capacitor carbon is reduced; meanwhile, the preparation method is simple and environment-friendly, the problems that alkali sewage is difficult to treat and pollution is caused by follow-up washing of a traditional alkali activation method are solved, the green preparation requirement is met, and the method is suitable for large-scale production and has potential application value in the field of preparation of supercapacitor electrode materials and the like.

The invention relates to a preparation method and application of an alkali-activated iron tailing geopolymer adsorbent. According to the method, an iron tailing geopolymer is prepared through an alkali activation method, that is, an aluminosilicate structure in iron tailings is destroyed in an alkali activation mode, so that silica tetrahedron and alumina tetrahedron structures of the iron tailings are reconstructed, and a geopolymer material with adsorption capacity is prepared; on the basis, a foaming agent hydrogen peroxide solution is introduced to adjust the performance, and parameters such as modulus, water cement ratio and curing temperature of the alkali activator are respectively adjusted to prepare an optimal sample. The iron tailing geopolymer adsorbent material which is high in adsorption rate and good in stability is obtained, and the effect of adsorbing residual ciprofloxacin in wastewater is remarkable.

The present invention relates to a method for treating a fluid, comprising passing said fluid through an alkali-activated inorganic polymer material obtainable by a process of treating a slag comprising AI2O3, SiO2, and at least one iron oxide and / or iron oxy-hydroxide and / or iron hydroxide, for example red mud.

The invention relates to anti-radiation ultra-high performance recycled concrete and a preparation method thereof, and belongs to the technical field of building materials and solid waste resource utilization. According to the concrete, a multi-source silicon-aluminum precursor mainly comprising ground blast furnace slag and an alkali activating solution are subjected to synergistic reaction, Portland cement is not contained, and a compact structure and excellent mechanical, durability and radiation protection performance are formed by combining ferronickel slag reclaimed sand with refined particle size, compounded shielding reinforcing filler (lead glass and barite) and high-performance copper-plated steel fibers. According to the method, high-valued recycling of the industrial solid waste is achieved, and the method has excellent environment friendliness, engineering adaptability and long-term stability and is suitable for high-protection-demand scenes such as nuclear facilities and radioactive places.

The invention relates to the technical field of coal gangue treatment, in particular to a method for preparing 45 mullite by using solid waste coal gangue, which comprises the following steps: crushing and screening the solid waste coal gangue, then carrying out microwave irradiation, after irradiation, feeding into a planetary ball mill for grinding and drying, adding a composite alkali solution, stirring and activating to obtain 45 mullite; the composite alkali solution is an aqueous solution formed by mixing NaOH and Na2CO3; adding an interface modifier and composite nanoparticles into the activated coal gangue powder to obtain modified powder; adding water, mixing, pugging, aging, carrying out static pressure molding, and maintaining the pressure to obtain a green body; and uniformly spraying an aqueous solution prepared from a mineralizing agent on the surface of the green body, pre-drying after spraying, carrying out segmented calcination, and cooling to room temperature to obtain the 45 mullicarb. The coal gangue is cooperatively treated through microwave irradiation, compound alkali activation, interface modification and a compound mineralizer, so that the problems of inertia of silicon-aluminum components and poor interface compatibility of the coal gangue are solved, and solid waste resource utilization is realized.

The invention provides a TPU sheet foam material composition for shoes and a foaming process thereof. The composition comprises a polyurethane prepolymer, a filler, a catalyst, a functional additive and TPU, wherein the polyurethane prepolymer is a prepolymer which is prepared by reacting carbodiimide modified MDI (Diphenylmethane Diisocyanate) with polyhydric alcohol; the filler is modified mica powder which is obtained by sequentially performing acid-base activation, ball milling, silane coupling and CTAB intercalation on mica powder and then grafting polycaprolactone on the surface of the mica powder. According to the foaming material composition and the foaming process provided by the invention, the TPU flaky material with uniform thickness and density in all directions can be prepared, the problem that the cost is increased due to the fact that upstream customers need to customize different molds is solved, meanwhile, the prepared flaky material is also convenient to transport, and the transportation cost is reduced; the size stability of the material is good, so that a downstream client can conveniently cut according to own requirements; and the rebound resilience of the material can meet the performance requirements of common soles and insoles.

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.

A method for producing an inorganic binder using reducing slag comprises a raw material preparation step, a mixing step, a curing step, and a drying step. The raw material preparation step is to provide a powder mixture. In the powder mixture, reducing slag powder accounts for 30wt% to 55wt%, glass powder accounts for 45wt% to 70wt%, the glass powder contains more than 85wt% of SiO2, and the reducing slag powder contains 26wt% to 62wt% of CaO, 20wt% to 32wt% of SiO2, and 1.8wt% to 12.5wt% of Al2O3. The mixing step is to place the powder mixture in a mixing tank, add an alkali activator for mixing and reaction, and form a mixed slurry. The alkali equivalent of the mixed slurry is 2% to 7%, and the water-binder ratio is 0.25 to 0.4. The curing step is to place the mixed slurry in a high-temperature and high-pressure curing environment to obtain a binder. The drying step is to dry the binder.

The invention relates to the technical field of chemical engineering, in particular to a method for preparing antibacterial functional core-shell silicon dioxide from fluorine-containing silicon slag, which comprises the following steps: S1, silicon slag pretreatment: mixing silicon slag with water to prepare slurry, sanding the slurry, and controlling the particle size D50 of SiO2 in the sanded silicon slag to be less than 200nm; s2, alkali activation and silicon release: mixing the sanded slurry with an alkali solution, carrying out a hydrothermal reaction, and controlling the silicon dissolution rate to be within a preset range; s3, constructing a gradient pH core shell: firstly, adjusting the pH of the system to an alkaline interval, and carrying out reaction to form a compact inner shell; adjusting the pH value of the system to an acidic interval, and adding a solution containing zinc and fluorine for reaction to form a composite shell; s4, post-treatment: washing and calcining a product obtained in the step S3 to obtain the core-shell silicon dioxide with the antibacterial function. The silicon slag is purified by a one-step method through a four-step integrated process of pretreatment, activation, gradient coating and post-treatment, and the fluorine-containing waste slag is directionally converted into a high-added-value functional material.

The invention discloses an early-strength grinding aid as well as a preparation method and application thereof, and belongs to the technical field of building materials. Every 100 parts of the early strength grinding aid comprises the following components in parts by weight: 12-18 parts of dual modified nano calcium silicate, 8-12 parts of a citric acid modified alcohol amine compound, 18-22 parts of alkali activated superfine slag powder, 3-6 parts of a dispersing agent, 2-4 parts of a stabilizer and the balance of water, the double modified nano calcium silicate is prepared by reacting sodium silicate with calcium nitrate and performing double modification through polyvinylpyrrolidone and a silane coupling agent; the citric acid modified alcohol amine compound is a citric acid modified alcohol amine compound, and the alcohol amine compound comprises triethanolamine and diethyl isopropanolamine; the alkali activated superfine slag powder is slag powder activated by NaOH. The early-strength grinding aid is low in cost, can effectively improve the 3d strength of mineral powder cement after being doped in the mineral powder cement, and enables the mineral powder cement to be free of shrinkage.

Disclosed is a method for preparing porous adsorbent material (22), the method comprising providing a mixture of metakaolin (10) and calcium titanate (12, CaTiO3), mixing the mixture with alkali solution (14) and reacting to obtain alkali-activated modified material (16), providing oil comprising oleic acid (18) as a foaming agent to the alkali-activated modified material (16), and providing hydrogen peroxide (20) as a foaming agent to the alkali-activated modified material (16), and allowing the alkali-activated modified material to foam in the presence of the hydrogen peroxide to obtain porous adsorbent material (22) comprising alkali-activated titanate-modified metakaolin. Also disclosed is porous adsorbent material comprising alkali-activated titanate-modified metakaolin, a flow- through column (24) comprising the porous adsorbent material and system for treating contaminated water.

One aspect of the present invention provides porous carbon capable of increasing the amount of supported sulfur. In a state whereby a lid is placed on a container that houses a mixture obtained by mixing a spherical resin, a base and water, modification is carried out by performing a first heat treatment in an inert atmosphere at a temperature of 700°C or higher. Chemical activation, and especially alkali activation, is used as an activation method, and carbonization and alkali activation are carried out by means of the first heat treatment to bring about modification, and specifically particle shrinkage, formation of pores due to gas release inside the particles, cracks on the surface of particles, and the like. The modified carbon (also known as porous carbon) is used as a support body for sulfur that is subsequently blended.

This application relates to the field of coal gangue treatment technology, specifically to a method for preparing 45 molecate from solid waste coal gangue, comprising the following steps: crushing and screening the solid waste coal gangue, followed by microwave irradiation; then grinding and drying in a planetary ball mill; adding a composite alkali solution (an aqueous solution of NaOH and Na2CO3) for stirring and activation; adding an interface modifier and composite nanoparticles to the activated coal gangue powder to obtain modified powder; mixing with water, kneading, aging, followed by static pressing and pressure holding to obtain a green body; uniformly spraying an aqueous solution of a mineralizer onto the surface of the green body; pre-drying after spraying; then performing segmented calcination; and finally cooling to room temperature to obtain 45 molecate. By synergistically treating coal gangue through microwave irradiation, composite alkali activation, interface modification, and composite mineralizer, the problems of inertness and poor interfacial compatibility of the silicon-aluminum components in coal gangue are solved, while also achieving the resource utilization of solid waste.

The invention relates to a basalt fiber modification method, a modified basalt fiber and application. The basalt fiber modification method comprises the following steps: (1) soaking basalt fibers in alkali liquor to obtain alkali-activated basalt fibers; (2) sequentially soaking the basalt fibers subjected to alkali activation in a first solution containing a first modifier and a second solution containing a second modifier to obtain modified basalt fibers; wherein the first modifier comprises one or more of carboxymethyl cellulose salt and alkylbenzene sulfonate; the second modifier comprises polyvinyl alcohol. The modified basalt fiber obtained through the method has better interface performance with the cement-based material, and the basalt fiber reinforced cement-based material can obtain better ductility.

The invention relates to a porous carbon material and a preparation method and application thereof.The preparation method of the porous carbon material comprises the following steps that a carbon source and water are mixed, the pH is controlled to be 3-5 through a pH regulator, then a hydrothermal reaction is conducted, a carbon precursor is obtained, the oil-water partition coefficient of the carbon source is 2 or below, the temperature of the hydrothermal reaction is 400-700 DEG C, and the pressure of the hydrothermal reaction is 6-12 MPa; performing oxidation treatment on the carbon precursor to obtain an oxidation product; and mixing the oxidation product with an alkali activator, and calcining to obtain the porous carbon material. The porous carbon material with orderly arranged pore channels can be prepared by using the preparation method disclosed by the invention, so that when the silicon-carbon material is prepared by using the porous carbon material disclosed by the invention, directional slow-release expansion and stress release can be realized in an electrochemical process, the structural stability of the silicon-carbon material is improved, and the service life of the silicon-carbon material is prolonged. The silicon-carbon material is prevented from being broken due to volume expansion of silicon in the circulation process, so that the electrochemical performance and the cycle life of the battery can be effectively improved.

The invention discloses a solid waste composite admixture for concrete and a preparation method thereof, and the solid waste composite admixture for concrete is prepared from the following materials: 30-50 parts of steel slag powder, 20-40 parts of superfine slag powder, 10-25 parts of phosphorus slag powder, 5-15 parts of nickel slag powder, 0.5-3 parts of a high-molecular low-carbon stabilizer, and 5-10 parts of modified phosphogypsum, the ardealite is calcined at 600 DEG C to remove impurities and then is mixed and ground with sodium citrate according to the ratio of 9: 1, and the specific surface area is greater than or equal to 350m < 2 > / kg; the steel slag powder is prepared by grinding steelmaking solid waste until the specific surface area is greater than or equal to 400m < 2 > / kg; the superfine slag powder is prepared by grinding blast furnace slag until the specific surface area is greater than or equal to 420m < 2 > / kg; the fineness of the phosphorus slag powder and the nickel slag powder meets the requirement that the 45-micron screen residue is smaller than or equal to 15%; the high-molecular low-carbon stabilizer is formed by compounding a silane coupling agent and a polycarboxylic acid copolymer; the porosity of the composite admixture is controlled to be 12%-16%, the average pore size is smaller than or equal to 420 nm, and the composite admixture is used for replacing 20%-50% of cement in concrete. According to the method, slag alkali activation is used for replacing high-energy-consumption steam curing, and the energy consumption peak value is reduced by 40% through a dynamic thermotechnical regulation and control system.

This invention discloses a solid waste composite admixture for concrete and its preparation method. The solid waste composite admixture for concrete is prepared from the following materials: 30-50 parts steel slag powder, 20-40 parts blast furnace slag powder, 10-25 parts phosphorus slag powder, 5-15 parts nickel slag powder, 0.5-3 parts high-molecular low-carbon stabilizer, and also includes 5-10 parts modified phosphogypsum. The phosphogypsum is calcined at 600℃ to remove impurities and then mixed with sodium citrate at a ratio of 9:1, resulting in a specific surface area ≥350 m². 2 / kg; the steel slag powder is steelmaking solid waste that has been ground to a specific surface area ≥400m². 2 / kg; the slag powder is blast furnace slag ground to a specific surface area ≥420m². 2 / kg; the fineness of the phosphorus slag powder and nickel slag powder meets the requirement of ≤15% residue on a 45μm sieve; the high-molecular low-carbon stabilizer is composed of silane coupling agent and polycarboxylic acid copolymer; the porosity of the composite admixture is controlled at 12%-16%, with an average pore size ≤420nm, and is used to replace 20%-50% of cement in concrete; this invention uses slag alkali activation to replace high-energy-consuming steam curing, and reduces peak energy consumption by 40% through a dynamic thermal control system.

Alkali-activated cement binders that include one or more mineral precursor components and particular combinations of sodium and calcium containing reagents and methods for producing the same. The reagent combinations are specified so as to deliver enhanced alkali activation of mineral precursors. These reagents provide for effective alkali activation, improved mechanical characteristics of resulting cementitious products, simpler mix designs, lower material handling risks, improved environmental performance, and improved cost effectiveness. Relevant sodium and calcium containing reagents include, but are not limited to sodium carbonate, sodium bicarbonate, calcium oxide and calcium hydroxide.

The present invention relates to a process for obtaining a silica zeolite activator from the combination of a source of silica (SiO2), a source of alumina (Al2O3) and a source of sodium (Na2O). This process involves a unique electrified alkaline fusion heat treatment and involves low temperatures and energy consumption, contributing to a reduction in the CO2 footprint. In addition, the present invention relates to the concentrated solid silica zeolite activator thus obtained, which has reactive silica and zeolite phases. The present invention also relates to the use of silica zeolite for alkaline activation of alkali-activated cement.

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.

The invention discloses a low-temperature auxiliary preparation method of a ceramic-based polyamide nanofiltration membrane, which comprises the following steps: (1) carrying out ultrasonic cleaning and strong alkali activation on a ceramic membrane, and loading a silane coupling agent to obtain a silane grafted ceramic membrane; (2) reacting the silane grafted ceramic membrane obtained in the step (1) with an aqueous solution containing piperazine and a polyamine catalyst at room temperature, and then removing the unreacted aqueous solution; (3) reacting the material obtained in the step (2) with an n-hexane solution of trimesoyl chloride and triethyl phosphate at room temperature, then removing the unreacted n-hexane solution, and pre-cooling the n-hexane solution at 20 DEG C for 12 hours for use; and (4) carrying out air drying and heat treatment on the material obtained in the step (3). According to the method, the oil phase is pre-cooled at low temperature, and the specific oil phase active buffer agent is introduced, so that the reaction activity of the acyl chloride monomer is effectively reduced, the interfacial polymerization process is changed from instantaneous explosion to controllable progressive, and the thickness uniformity and compactness of a separation layer are remarkably improved.

The present invention belongs to the field of heavy metal pollution control and remediation technology, and specifically relates to a manganese dioxide nanoparticle @ modified phosphate tailings composite material, and its preparation method and application. The present invention first activates the phosphate tailings with an alkali to generate an alkali-activated phosphate tailings with more surface defects and functionalized sites; then, the alkali-activated phosphate tailings, manganese chloride, and a surfactant, polyvinyl pyrrolidone, are mixed and surface-modified under acidic conditions so that the manganese chloride is loaded on the alkali-activated phosphate tailings to obtain an intermediate; finally, the intermediate is oxidized to obtain a manganese dioxide nanoparticle @ modified phosphate tailings composite material. The manganese dioxide nanoparticle @ modified phosphate tailings composite material of the present invention uses manganese dioxide nanoparticles to achieve efficient adsorption of heavy metal ions in water, overcoming the technical defects of the existing modified phosphate tailings adsorption materials or manganese dioxide composite materials.