133 results about "Alkali activated" patented technology

The invention discloses alkali-activated porous carbon and a preparation method thereof, and relates to the field of new material preparation, and the preparation method comprises the following steps: uniformly mixing matrix carbon and a strong alkaline substance according to a mass ratio to obtain a mixed material, putting the mixed material into a crucible, and carrying out high-temperature calcination and cooling on the mixed material under the protection of an inert atmosphere; washing and filtering the mixed material subjected to high-temperature calcination for 3-6 times by using deionized water; after washing is completed, strong acid is used for soaking; and after soaking, filtering to obtain a mixed material filter cake, soaking the mixed material filter cake in ionized water, repeatedly washing, and drying until the pH value is neutral. The porous carbon material is prepared through alkali activation, the preparation steps are simple, expensive auxiliary equipment is not needed, the cost is low, preparation is safe, and the method has extremely high economic benefits and large-scale application prospects.

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.

The invention belongs to the technical field of building material exciting agents, and particularly relates to a sodium silicate powder exciting agent produced through a melting method. The sodium silicate powder exciting agent is prepared by taking waste incineration fly ash, glass powder and sodium hydroxide as reactants through heat treatment. The powdery exciting agent is prepared instead of a traditional solution form, the possibility of a single-component alkali activation binder system is achieved, the waste incineration fly ash is selected as one of the raw materials, the production cost of the exciting agent is greatly reduced, and therefore the cost of alkali activation concrete is reduced; according to the present invention, the utilization rate of the waste incineration fly ash in the building field can be improved, the cement consumption and the energy consumption are reduced, the problems of environmental pollution and land occupation caused by solid waste stockpiling are improved, the dual-carbon emission reduction is promoted, and the prepared alkali activation binder mortar has excellent compressive strength.

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

A cement composition includes a curable component in an amount of 10 to 25 wt. %; a fine aggregate (FA) in an amount of 20 to 40 wt. %; a coarse aggregate (CA) in an amount of 40 to 50 wt. %; and an alkaline component in an amount of 5 to 15 wt. %, each wt. % based on the total weight of the cement composition. The curable component includes a cementitious material having an average particle size (D50) of 10 to 17 micrometers (μm), a limestone powder (LSP) material having a D50 of 13 to 19 μm, a red mud (RM) material having a D50 of 30 to 36 μm, a silicomanganese fume (SMF) material having a D50 of 28 to 34 μm, and a natural pozzolan (NP) material having a D50 of 13 to 19 μm.

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 present disclosure provides a method for hydrating multioxide silicate material, the method comprising providing silicate mineral material, providing solution containing an alkali activator and a ligand, and mixing amorphous5 multioxide silicate material with the solution containing the alkali activator and the ligand to obtain a mixture. The present disclosure also provides hydrated silicate mineral material obtained by the method and concrete comprising the hydrated silicate mineral material. The present disclosure also provides a product comprising or consisting of ceramic-like or concrete material comprising the0 hydrated silicate mineral material or the concrete. The present application also provides use of dihydroxy aromatic compound and use of the hydrated silicate mineral material.

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.

Disclosed are a method for preparing a non-sintered shell-wrapped ceramsite using solid waste meanwhile immobilizing a heavy metal in river sediment, and a non-sintered river-sediment-based shell-wrapped ceramsite, which relate to the technical field of building materials. The disclosure combines river sediment with a solid waste powder and an alkali activating powder material, and adopts multiple-step granulations to realize particle size control and physical pore formation, thereby obtaining a non-sintered ceramsite. A sulfoaluminate cement and a Portland cement are used to encapsulate the non-sintered ceramsite and form a shell by wrapping, thereby preparing a non-sintered river-sediment-based shell-wrapped ceramsite with internal porosity and dense shell.

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.

The invention discloses an alkali-activated regenerative foam concrete, which comprises cement, recycled powder, an activator, water and foam, wherein the recycled powder is one of recycled micropowder and recycled sand powder, the activator is at least one of sodium carbonate, sodium sulfate and sodium silicate, the cement accounts for 60% of the total mass of cement and recycled powder, the recycled powder accounts for 40% of the total mass of cement and recycled powder, the sodium carbonate is 0-0.5% of the mass of recycled powder, the sodium sulfate is 0-6.36% of the mass of recycled powder, the sodium silicate is 0-3.64% of the mass of recycled powder, the water-cement ratio is 0.467-0.653, and the foam accounts for 9.7% of the total mass of cement and recycled powder. The present invention prepares cement slurry by stirring with a vertical pure slurry stirring pot, and uses a stirring method that combines manual stirring and mechanical stirring, and manually stirs at 45 degrees to mix and foam with anti-gravity stirring, thereby improving the effect and quality of concrete mixing and foaming.

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 invention provides geopolymer-based artificial stone as well as a preparation method and application thereof, and belongs to the technical field of artificial stone. The geopolymer-based artificial stone provided by the invention does not contain cement and additives, and is prepared from the following raw materials: single-component geopolymer powder, water and aggregate in a mass ratio of 1: (0.28-0.42): (1.5-2.8); the single-component geopolymer powder comprises an alkali activator and a correction material, and the silica-alumina ratio of the single-component geopolymer powder is 2-3; the preparation raw materials of the alkali activator comprise a high-silicon raw material and an alkali activator, and the mass ratio of the high-silicon raw material to the alkali activator is 1: (1-1.2); the correction material comprises metakaolin and silica fume with the mass content of SiO2 being greater than 95%. The geopolymer-based artificial stone provided by the invention does not adopt cement, has a remarkable effect in the aspect of reducing carbon dioxide emission, and has relatively high compression strength and bending strength.

The utility model relates to the field of wire rod processing, and discloses an aluminum alloy wire rod surface modification processing line. The aluminum alloy wire surface modification processing line comprises a control device, a pay-off device, a first wire storage device, a decontamination tank, an alkali activation tank, a deoxidation tank, a zinc dipping tank, a replacement tank, a first electrolytic tank, a dryer and a take-up device, and the pay-off device, the first wire storage device, the decontamination tank, the alkali activation tank, the deoxidation tank, the zinc dipping tank, the replacement tank, the first electrolytic tank, the dryer and the take-up device are sequentially connected with the control device. Through the arrangement of the zinc dipping tank, the replacement tank and the first electrolytic tank, the problem that the binding force of the coating on the surface of the aluminum alloy wire is low can be solved, the binding force between the coating of the aluminum alloy wire and the surface of the wire is increased, and the surface of the aluminum alloy wire is protected. And through chemical plating and electrolytic plating of the replacement tank and the first electrolytic tank, the uniformity and the thickness of a plating layer are improved, and the stability and the reliability of wire surface plating treatment are improved.

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.

Alkali-activated hydraulic binders, as well as concrete and mortar compositions comprising those, with reduced alkali-silica reaction (ASR) are disclosed. In particular, the concrete and mortar compositions featuring reduced ASR herein disclosed, comprise reactive silica containing aggregates and alkali-activated hydraulic binders, preferably containing ground granulated blast furnace slag, which result in hardened products with high interstitial pH which feature excellent mechanical properties, while at the same time reducing effectively expansion (and ultimately cracking) due to ASR.

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 present invention discloses an anti-cracking water-reducing agent suitable for alkali-activated cement, and its preparation process and application. The raw materials for preparing the anti-cracking water-reducing agent include the following components: 500 parts of refined naphthalene, 200 parts of formaldehyde solution, 80 parts of dihydroxy-terminated dimethyl silicone oil, 100 parts of alkali solution, 15-20 parts of sodium dodecylbenzene sulfonate, 80-100 parts of sulfate solution, and 400 parts of water. The above-mentioned anti-cracking water-reducing agent of the present invention not only effectively solves the problems of instability and performance failure of existing water-reducing agents in high-alkali environments, thereby reducing the water consumption of alkali-activated cement while ensuring its good fluidity, but also can significantly reduce the shrinkage cracking of alkali-activated cement after hardening, and reduce the risk of cracking and damage.

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.