69 results about "Alkaline activation" patented technology

The invention discloses metal element-doped nano silicon carbon as well as a preparation method and application thereof, and relates to the field of negative electrode materials. The nano silicon carbon takes porous carbon as a carbon skeleton, and the porous carbon is sequentially attached with nano silicon and coated with a carbon material layer through a chemical vapor deposition method; the porous carbon is prepared by carbonizing resin containing metal nitride after alkali activation and pore forming, and the resin containing the metal nitride is prepared by condensation polymerization of a phenolic compound, an aldehyde compound and the metal nitride in the presence of a catalyst. The porous carbon is doped with the metal nitride in the resin polycondensation process, the conductivity of the nano silicon carbon is effectively improved, the powder resistance is reduced, holes in the surface of the porous carbon provide more expansion space for deposited nano silicon, a carbon material layer formed by subsequent deposition and coating provides a protection effect, the reaction between silicon and an electrolyte can be inhibited, and the service life of the nano silicon carbon is prolonged. A stable SEI film is formed, the cycling stability of the material is improved, the volume expansion rate of a pole piece is inhibited, and the cycling life and the stability of the battery are improved.

The invention discloses a method for preparing a supercapacitor electrode through high-temperature alkali activation. The method comprises the steps of preparing porous carbon, preparing an electrode plate, preparing a supercapacitor, and carrying out electrochemical performance testing and material characterization testing. When the carbon precursor of the supercapacitor electrode material is prepared, organic components in walnut shells can be refined and removed and biochar is left by utilizing the effect of removing organic matters in biomass at high temperature of a tubular furnace; the potassium hydroxide with different concentrations is used as the activating agent to activate the biochar, the porosity and the internal structure richness of the porous carbon can be greatly improved, and compared with traditional solid alkali activation, the aqueous solution alkali activation has the advantages that the reliability and the possibility are improved, and the contact area of the activating agent and substances is increased. The electrode material prepared by the method has the advantages of low manufacturing cost, small environmental pollution and excellent service life, and is an ideal electrode material.

The invention discloses a method for preparing a porous carbon material by recycling coal gasification slag and semi-coke wastewater, which comprises the following steps: by taking coal gasification fine slag as a carrier and semi-coke wastewater as a phenol source, carrying out flotation-acid leaching modification on the fine slag to purify a carbon-rich component and optimize the surface adsorption activity of the carbon-rich component; then fully adsorbing phenolic substances in the wastewater by utilizing the modified slag body; introducing a composite aldehyde cross-linking agent, and initiating an in-situ phenolic aldehyde polymerization reaction to generate a composite precursor; the precursor is subjected to high-temperature carbonization and alkali activation pore forming, and finally the porous carbon material with the characteristics of high specific surface area, rich graded pores and low ash content is prepared. According to the process, full-amount collaborative recycling of the two wastes is achieved, and the process is green and free of secondary pollution. The obtained material is high in carbon content and rich in defect structure and surface functional groups, shows excellent adsorption capacity and catalytic carrier performance, can be widely applied to the fields of deep purification of water pollutants, adsorption of volatile organic compounds, energy catalysis and the like, and has remarkable environmental protection benefits and resource economic values.

The invention discloses a method for preparing a porous carbon / hydrotalcite-like compound adsorbent from fine coal gasification slag, which comprises the following steps: by taking the fine coal gasification slag as a raw material, sequentially carrying out alkali activation desiliconization and ion regulation, adding a pH regulator, stirring, and carrying out one-pot hydrothermal synthesis to obtain the porous carbon / hydrotalcite-like compound adsorbent. And carrying out solid-liquid separation and washing on the hydrothermal composition to obtain a solid phase, namely the porous carbon / hydrotalcite-like compound adsorbent. According to the invention, the pore structure of carbon is expanded while alkali activation desiliconization is carried out, so that the formation of porous carbon is ensured; the porous carbon / hydrotalcite-like compound adsorbent meets the requirement of forming a hydrotalcite-like compound with better crystallinity through ion regulation and control, provides an alkaline environment for synthesizing the hydrotalcite-like compound by adding a pH regulator, ensures the formation of the hydrotalcite-like compound through one-pot hydrothermal synthesis, and is obtained through solid-liquid separation and washing, the aggregation state in the hydrotalcite-like compound synthesis process is improved, and the stability and adsorption active sites of the composite adsorption material are increased.

The invention provides a loess-based hydrogen sulfide adsorbent, a preparation method thereof and application of the loess-based hydrogen sulfide adsorbent in removal of hydrogen sulfide in natural gas. Loess with a specific substance content is taken as a raw material, the material is prepared through pretreatment, modification activation and extrusion molding, and modification activation comprises alkali activation, graphene oxide crosslinking and copper and zinc loading. According to the invention, specific loess is combined with a targeted modification and activation process, so that the porosity and the specific surface area are effectively improved, and a new active phase is formed and endowed with adsorption and catalytic oxidation effects. The prepared adsorbent has the remarkable advantages of low cost, high sulfur capacity, long penetration time, excellent regeneration performance and the like. In a medium-low-temperature dry desulfurization scene, HS (the concentration is reduced to 0.1 ppm or below) in natural gas can be efficiently removed, and the device is particularly suitable for small and medium-sized natural gas purification devices in various process scenes such as a fixed bed and a moving bed, and can also be expanded to various fields such as coal chemical industry, petrochemical industry, biogas purification, environmental protection and the like.

This invention relates to the field of cement technology, specifically to a fiber-reinforced high-strength cement pole and its preparation method. The pole comprises a steel wire skeleton and a conical annular pole body covering its outer circumference. The pole body is formed by centrifugal molding and curing of a cement-based composite material containing interfacially pre-complexed basalt chopped fibers. The interfacially pre-complexed basalt chopped fibers are obtained sequentially through alkaline activation, silane-nano silica treatment, polycarboxylate segment grafting, and calcium ion pre-complexation, and are added to the slurry after the cementitious material is initially moistened and before the aggregate is added. This method improves the dispersibility and interfacial bonding stability of the basalt chopped fibers in a low water-cement ratio cement matrix, thereby enhancing the pole's compressive, tensile, crack, shrinkage, and freeze-thaw resistance.

The application discloses a quaternary solid waste-based soil stabilizer (GSCP) for a base layer, which is composed of slag (GGBFS), steel slag (SSA), calcium carbide slag (CS) and phosphogypsum (PG) and has a weight ratio of GGBFS:SSA:CS:PG=56:24:12:8. The stabilizer forms C-S-H colloid and ettringite (AFt) through alkaline activation and sulfate activation, does not need to add cement or chemical activator, is used for stabilizing silty clay and steel slag mixed soil, and significantly improves the unconfined compressive strength, splitting tensile strength, water stability and freeze-thaw resistance. Compared with a traditional cement-based stabilizer, the application reduces carbon emission by 82% and cost by 31.25%, provides a low-carbon and economical solution for road engineering, and is suitable for the base layer and the subbase layer of a secondary road or above.

The invention discloses a preparation method and application of a modified quartz sand adsorption material, and relates to the technical field of quartz sand adsorption materials.The preparation method comprises the following working steps that S1, alkali activation treatment is conducted; step S2, silanization modification; step S3, potassium persulfate activation; quartz sand is subjected to surface modification through three-step modification treatment, wherein a sodium hydroxide solution is adopted to activate the surface of the quartz sand, and hydroxyl groups are introduced; then, gamma-aminopropyltriethoxysilane (KH550) is used for carrying out silanization modification, and an amino functional group is grafted; finally, after amino is activated through potassium persulfate (K2S2O8), 2-acrylamido-2-methylpropanesulfonic acid (AMPS) is grafted, a sulfonic functional group is introduced, and a new group is introduced to modify the quartz sand, so that the adsorption capacity of the quartz sand as a seed crystal to calcium fluoride in a crystallization-induced coupled fluidized bed system is improved, and the effluent turbidity in the fluidized bed system is reduced. Compared with other seed crystals, the calcium fluoride adsorption capacity is higher, and the effluent turbidity is lower.

The invention discloses a cobalt-nitrogen-doped carbon catalyst based on polyvinyl chloride plastic derivation as well as a preparation method and application of the cobalt-nitrogen-doped carbon catalyst. The preparation method comprises the following steps: firstly, carrying out alkali activation on polyvinyl chloride plastic, carbonizing, and carrying out acid etching to obtain a hierarchical porous activated carbon carrier; and growing the ZIF-67 metal organic framework on the surface of the carrier in situ by adopting a solvent-induced self-assembly method, and carrying out pyrolysis and acid pickling treatment. When the catalyst is applied to degradation of tetracycline in a PMS activation system, under the initial concentration of 20 mg / L, 0.05 g / L of the catalyst and 0.5 mM of PMS are added, and the degradation rate within 30 minutes reaches 80% or above. According to the preparation method disclosed by the invention, high-dispersion loading of cobalt active sites and accurate regulation and control of a carbon carrier defect structure are realized through a synergistic strategy of KOH melting activation and ZIF-67 confinement pyrolysis; low-cost waste plastic is taken as a raw material, and a gradient carbonization-in-situ composite process is combined, so that a dual solution is provided for high-value conversion of plastic solid waste and treatment of emerging pollutants.

The invention provides a silane deposition silicon-carbon composite material as well as a preparation method and application thereof, and belongs to the technical field of lithium battery materials. The preparation method comprises the following steps: performing in-situ reaction on zinc salt, dimethylimidazole and a pore-forming agent to obtain a first precursor; and after carbonization treatment, alkali activation is carried out, and then vapor deposition is adopted to obtain the silane deposition silicon-carbon composite material. The prepared silane deposition silicon-carbon composite material has good stability and mechanical strength, hierarchical pore structure distribution and high-capacity ultra-long circulation. The method can solve the problems that existing vapor deposition silicon-carbon is poor in structural stability, and pores of a carbon matrix obtained through traditional ZIF-8 carbonization are prone to collapse.

The invention relates to the field of batteries, in particular to a hard carbon composite material, a preparation method thereof, a negative plate and a battery. The preparation method of the hard carbon composite material comprises the following steps: impregnating amino resin in a modified solution for alkali activation and pore-forming treatment to obtain a resin-based precursor; carrying out heteroatom doping treatment on the resin-based precursor to obtain a hard carbon precursor; and mixing the hard carbon precursor with the coating liquid, and sequentially carrying out spray drying and reduction treatment to obtain the hard carbon composite material. The hard carbon composite material prepared by the invention has excellent first efficiency, cycle performance and rate capability.

The invention discloses an underwater super-oleophobic film for oil field logging and a preparation method of the underwater super-oleophobic film, and belongs to the technical field of functional film materials and logging tool surface protection. The method comprises the following steps: carrying out decontamination, degreasing and alkaline activation on the outer surface of a logging instrument, forming a film on the surface of a substrate, grafting a modified chitosan solution, and applying gamma-ray irradiation in a wet acid environment to realize three-dimensional cross-linking among chitosan molecular chains, so as to obtain an organic base film with hydrophilicity and adhesive force. And then immersing the organic base membrane into a mineralization solution obtained by dispersing calcium carbonate, bubbling carbon dioxide and carrying out solid-liquid separation, so that carbonate is subjected to induced nucleation and controlled growth on the surface of the membrane to form an inorganic mineralization layer, and an organic-inorganic hybrid membrane with a micro-nano coarse structure is constructed. The thin film shows underwater super-oleophobic and low-adhesion characteristics in a saline water environment, has mechanical strength and anti-scouring capacity, can reduce pollution of oil stains to a logging instrument shell and signal attenuation, and improves logging data reliability.

The invention discloses microwave activated red mud-biomass solid waste magnesium oxychloride aggregate and a circulation method, and belongs to the technical field of solid waste recycling and negative carbon building materials. The method comprises the following steps: mixing Bayer process red mud and biomass solid waste according to a mass ratio of 3: 1-1: 1, and carrying out microwave activation at 500-1200 DEG C for 10-60 minutes; carrying out magnetic separation on the activated material to obtain an iron ore concentrate-biomass charcoal composite material which can be used as a wave-absorbing material, so as to obtain low-alkali activated red mud residues; 10-50 parts of the residues, 15-40 parts of light calcined magnesia powder and 15-40 parts of a magnesium chloride solution are mixed, the molar ratio of magnesium oxide to magnesium chloride is 6-9, and solid waste aggregate is obtained after forming and curing; the waste aggregate is regenerated into active powder after being subjected to heat treatment at 400-800 DEG C for 0.5-2 hours, and new aggregate can be circularly prepared. According to the method, red mud dealkalization and iron recovery, high-value utilization of biomass and carbon sequestration and stability augmentation and closed-loop circulation of aggregate are synchronously realized.

The invention relates to the technical field of environmental protection and water treatment, in particular to a preparation method and application of a multi-stage alkali-activated fish scale calcium high-capacity defluorination material. According to the invention, hydrochloric acid demineralization pretreatment is combined with a stepped alkali activation process, so that the multi-stage alkali-activated fish scale calcium high-capacity defluorination material with high adsorption capacity, wide pH adaptability and strong anti-interference performance is successfully prepared; and the fluorine removal rate can reach 99%, the interference of coexisting anions is avoided, and an innovative solution is provided for treatment of fluorine pollution of a water body.

The application belongs to the technical field of biomass porous carbon material preparation, and particularly relates to a method for reducing energy consumption of a porous carbon produced by an alkali activation process and a system for realizing the method. The method comprises feeding, preheating, controllable air injection, controllable combustion, atmosphere transformation and activation, and post-treatment. The system integrates a controllable air injection system and a combustion reaction zone. By injecting 15% to 50% of the theoretical complete combustion air, the controllable combustion of volatile combustible gas generated by pyrolysis is realized. The method can directly provide part of the heat required for activation, reduce the external heating requirement, and achieve an energy saving effect of 15% to 30%. In addition, since oxygen is consumed in the combustion process, an anaerobic or reducing environment can be created and maintained in the rear part of the activation section without relying on strict equipment sealing and high-purity inert gas purging, thereby reducing the requirement for equipment airtightness and inert gas consumption.

The present invention provides a fly ash-based calcium silicate hydrate, a preparation method, and uses thereof. The preparation method comprises adding fly ash as a silicon source and a calcium-containing compound as a calcium source to water to produce a mixed slurry, then subjecting the mixture to thermal activation and hydrothermal reaction. After the reaction is complete, the liquid-solid separation and drying are performed to produce the fly ash-based calcium silicate hydrate. The present invention utilizes a pre-thermal activation process instead of the traditional alkaline activation process. The entire process does not require the addition of a caustic medium, the product does not require washing, and does not contain potassium or sodium metal ions, resulting in a simple process and low cost. The fly ash-based calcium silicate hydrate product produced by this method has a crystalline tobermorite content of up to 40%, a fibrous porous structure, and possesses the functions of water retention, heavy metal ion adsorption, heat insulation, and sound insulation. Furthermore, the fly ash-based calcium silicate hydrate product has a high content of citric acid-soluble silica and can be widely used in cement, concrete, adsorbents, soil conditioners, thermal insulation materials, sound insulation materials, and other fields.

The present invention relates to a preparation method and application of a La-magnetic montmorillonite hydrogel adsorbent. In this preparation method, montmorillonite is successively subjected to alkali activation, magnetization, crosslinking, and lanthanum modification to prepare the La-magnetic montmorillonite hydrogel adsorbent; by introducing iron elements and using rare earth element lanthanum for modification, it has a larger adsorption capacity, enhances the selectivity of the adsorbent for fluoride ions, and reduces the adsorption of other ions or pollutants; the whole process steps are simple and easy to operate; the obtained adsorbent can effectively remove fluoride from low-concentration fluoride-containing wastewater or fluoride-containing wastewater requiring in-depth treatment, and the treatment effect meets the requirements of the fluoride concentration in the effluent for drinking water.

The application discloses a kind of waste incineration fly ash and lithium ore tailings collaborative processing method, steps include: waste incineration fly ash and lithium ore tailings are mixed, and mixed material is obtained;Mixed material is mixed with alkaline activator, and is alkaline activated;After alkaline activation, mixed liquid is hydrothermally reacted, solid-liquid separation, and pretreatment liquid and pretreatment residue are obtained, and pretreatment product is obtained after water washing of pretreatment residue;Shale or coal gangue, sludge and pretreatment product are mixed, water is added, sintered, and collaborative processing of waste incineration fly ash and lithium ore tailings is completed.The lithium ore tailings used in the method of the application is a kind of porous material, has greater specific surface area and more reasonable silicon-aluminum-calcium ratio, which is beneficial to accelerate alkaline activation, improve the efficiency of hydrothermal reaction, the process steps are simple, the processing time is short, efficient, convenient, energy-saving, through the comprehensive treatment mode of "alkaline activation+hydrothermal pretreatment+sintering solidification", finally realizes the dual goal of waste treatment with waste and efficient solidification of heavy metals.

The invention belongs to the technical field of oilfield chemical materials, and relates to a pH response release type oil well cement fluid loss agent as well as a preparation method and application thereof. The pH response release type oil well cement fluid loss agent provided by the invention comprises an inner core, a middle modification layer and a shell, wherein the inner core is a multi-component copolymer; the middle modification layer is silanol attached to the surface of the inner core, and the shell is SiO2. According to the pH response release type oil well cement fluid loss agent disclosed by the invention, by introducing the pH response type SiO2 shell layer, an intelligent release mechanism of'seawater shielding-alkaline activation 'is realized, and the limitation of the prior art is broken through from double dimensions of physical isolation (avoiding ion contact) and chemical triggering (releasing as required).

The present invention discloses a method for preparing capacitor materials by finely controlling and micro-oxidizing carbon materials, comprising the following steps: (1) using coal powder as an activation raw material, and activating it at high temperature by an alkali activation method to obtain coal-based activated carbon; (2) subjecting the coal-based activated carbon obtained in step (1) to acid washing, water washing, deashing, and drying to obtain purified coal-based activated carbon; (3) finely controlling the purified coal-based activated carbon in step (2), mixing the purified activated carbon with a certain amount of sedimentation liquid for a period of time, performing liquid phase impregnation, filtering, drying, and carbonization deposition to obtain coal-based porous carbon; (4) uniformly mixing the coal-based porous carbon in step (3) with an oxidant solution, placing it in a water bath at a certain temperature, fully stirring for a period of time, performing surface oxidation treatment, and washing with water to obtain the final product, an ultra-microporous carbon electrode material. The present invention provides a high-value utilization method for coal, has low preparation cost, and produces a product with good electrical properties.

The application belongs to the technical field of road engineering materials, and particularly discloses high-viscosity emulsified asphalt and a preparation method thereof, which comprises the following steps: S1, adjusting the pH of part of deionized water to 2-3, adding part of a composite emulsifier and a stabilizer, and stirring until completely dissolved to obtain an acidic soap solution; S2, adjusting the pH of the remaining deionized water to 9-10, adding an amino-terminated hyperbranched polyamide, an amino-terminated liquid butadiene-acrylonitrile and epoxy-modified nano silicon dioxide, and obtaining an alkaline activation solution after high-speed dispersion; S3, after heating base asphalt, pouring the base asphalt into the acidic soap solution, and obtaining initial emulsion through colloid mill shearing emulsification; S4, after cooling the initial emulsion, adding the alkaline activation solution, the remaining composite emulsifier and an epoxy resin emulsion in sequence under stirring, continuing to stir, cooling to room temperature, and filtering, and the high-viscosity emulsified asphalt is obtained.

The invention belongs to the technical field of multi-layer co-extrusion PE films, and particularly provides a high-barrier multi-layer co-extrusion PE film and a preparation method thereof. The high-barrier multi-layer co-extrusion PE film sequentially comprises the following components: an mPE layer, a bonding layer, a modified EVOH barrier layer, a bonding layer and an mPE layer. A preparation method of the modified EVOH barrier layer comprises the following steps: firstly, carrying out alkali activation and oxidation on EVOH to obtain oxidized EVOH; and respectively dispersing the oxidized EVOH, the aminated graphene oxide and chitosan in a solvent, mixing, and reacting. The preparation method of the high-barrier multi-layer co-extrusion PE film comprises the following steps: firstly preparing the bonding layer particles, then preparing the modified EVOH barrier layer particles, and finally performing multi-layer co-extrusion on the components according to a certain mass ratio. The high-barrier multi-layer co-extrusion PE film prepared by the preparation method disclosed by the invention has relatively high barrier performance.

This invention discloses a gasification slag-based composite phase multi-level porous photocatalytic material, its preparation method, and its applications. It belongs to the technical field of coal-based solid waste resource utilization and environmental pollution control. The preparation method of the gasification slag-based composite phase multi-level porous photocatalytic material includes: calcining a mixture of urea and melamine to obtain graphitic carbon nitride; mixing sodium hydroxide, water glass, and water, and aging the mixture to obtain an alkaline activation liquid; uniformly mixing gasification slag, graphitic carbon nitride, and the alkaline activation liquid to form a slurry; adding a foam stabilizer and a foaming agent to the slurry, and stirring to obtain a foamed slurry; casting the foamed slurry into a mold, curing, and then demolding to obtain a green body with a porous structure; placing the green body in an alkaline mother liquor for a hydrothermal reaction, followed by washing and drying to finally obtain the gasification slag-based composite phase multi-level porous photocatalytic material. The photocatalytic material prepared by this invention has good strength, is easy to separate and recover, and exhibits excellent adsorption and photocatalytic performance.

The invention discloses a composite modified component of a diatomite foundation and a reinforcement construction process, and relates to the technical field of foundation treatment. According to the composite modified component, original diatomite is used as a base material and matched with sulphoaluminate cement, modified nano silicon dioxide, an organic silicon water repellent, polypropylene fibers and metakaolin-gypsum auxiliary modified components, through the synergistic effect of the multiple components, the defects of high porosity and strong hydrophilicity of the diatomite are overcome, and the foundation strength and water stability are improved. The reinforcement construction technology comprises the steps of in-situ modification and steep slope area reinforcement, alkaline activation after excavation, modified soil layered compaction, three-dimensional drainage grating laying, miniature steel pipe pile-bearing platform supporting and slope surface hanging net spray-seeding planting, and an integrated system of component modification, structure supporting and ecological protection is formed. The problems that a traditional technology is poor in reinforcing effect, long in construction period and high in cost are solved, engineering stability and ecological compatibility are both considered, and the method is suitable for diatomite foundation reinforcing scenes such as roads, bridges and buildings.

The invention provides a method for preparing an A-type zeolite molecular sieve by taking natural zeolite as a raw material, and relates to the technical field of natural zeolite resource utilization and molecular sieve synthesis. The method comprises the following steps: mixing natural zeolite with a sodium salt aqueous solution, and carrying out sodium ion exchange to obtain natural zeolite subjected to sodium ion exchange; grinding and mixing the natural zeolite subjected to sodium ion exchange and sodium hydroxide, and activating under a closed condition to obtain an activated material; and mixing the activated material with water and an aluminum source, and carrying out hydrothermal crystallization on the obtained mixed material to obtain the A-type zeolite molecular sieve. The alkali activation can be carried out under a relatively mild condition (below 200 DEG C), and compared with a solid-phase alkali fusion method pretreatment process widely applied to natural mineral zeolitization, the method has the advantages that the activation treatment temperature is greatly reduced, the energy is saved, and the safety is high; the A-type molecular sieve prepared by the method is high in crystallization degree and purity, and also high in static water adsorption rate (greater than or equal to 26 wt%, and reaches the first-grade product level of the industrial standard).

The invention discloses a method for preparing a nitrogen-rich super-capacitor carbon material through wet sludge activation and nitrogen fixation, and belongs to the cross technical field of organic solid waste resource utilization and super-capacitor carbon material preparation. Firstly, through in-situ alkali heat microwave activation of wet sludge, microwave excitation reaction of alkali and SiO2 in biomass ash is utilized, so that on one hand, drying energy consumption is reduced; on the other hand, macropore-mesopore prefabrication is realized in situ. Secondly, a phosphoric acid dynamic nitrogen fixation-etching technology is coupled, micropores are formed through gas etching in the pyrolysis process, and meanwhile, a P-N-C coordination structure is constructed by utilizing PO4 < 3-> and pyridine nitrogen, so that more nitrogen components are fixed in carbon. Compared with a traditional alkali activation and urea nitrogen fixation combined process, the method has the advantages that the technical difficulty that hierarchical pore structure regulation and control, nitrogen doping stability and green preparation are difficult to cooperate is successfully broken, and a subversive path is provided for sludge recycling.

The application discloses a little clinker cement activator and relates to the technical field of cement activators.The application comprises the following steps: step a: preparing an inorganic alkaline activation component: physically mixing anhydrous sodium sulfate and solid sodium silicate with a modulus of 1.0-1.5 at a weight ratio of 3:1-1:1, grinding to a specific surface area of greater than 400 m² / kg, and obtaining composite inorganic activation powder A.The application precisely solves the contradiction between the early strength development and the setting regulation of high-mixed-material cement through the synergy of the inorganic alkaline activation component and the organic setting-regulating component, sodium sulfate (Na2SO4) can quickly dissolve to provide Na⁺ and SO4 2‑ , on the one hand, improves the liquid-phase alkalinity, and activates the glass structure of slag and the like to disintegrate, and on the other hand, quickly reacts with the cement hydration product Ca(OH)2 and the aluminum phase to generate ettringite (AFt), which is the main contributor to the early strength; and the solid sodium silicate (Na2O·nSiO2) with a low modulus provides a continuous and mild alkali activation effect, and ensures the continuous growth of the mid-later strength.

The application discloses a river silt in-situ curing agent and an implementation method, relates to the technical field of silt curing, and comprises a curing material and a coating layer. The curing material comprises the following components in parts by weight: silicate 20-50 parts, calcium-aluminum hydrotalcite 20-30 parts, cement clinker 25-35 parts, polyacrylamide 2-27 parts, polyaluminum chloride 7-15 parts, tannic acid 1-13 parts, and calcium oxide 5-15 parts. The coating layer comprises three layers and is composed of acrylic high polymer materials. The inner coating layer further comprises a hydrophilic material. The hydrophilic material is silicon dioxide, and the usage amount is 0.5%-3% of the mass of the outer coating layer. Through the intelligent release design of the coating layer, the rapid dehydration and alkaline activation of the calcium oxide, and the gelation-adsorption synergy of the silicate and the hydrotalcite, efficient in-situ silt curing is realized, and multi-component interference under complex environments is resisted.

The invention relates to the technical field of geosynthetic materials, and discloses a high-performance geotextile and a preparation process thereof.The high-performance geotextile takes polyvinyl alcohol and polyacrylic acid as polymer matrixes, and the interior of a fiber structure of the high-performance geotextile contains an inorganic mineral network generated through an in-situ reaction of sodium silicate and calcium salt; a polymer cross-linked network is formed through coordination of multivalent metal ions, and the two networks penetrate through each other to form a synergistically enhanced dual-network structure; the preparation process comprises the following steps: preparing the components into a spinning solution, and realizing synchronous implementation of fiber physical forming and inorganic phase in-situ generation through wet spinning; carrying out alkaline activation on the fiber to expose a reaction site, and treating with a multivalent metal ion solution to realize chemical cross-linking locking; a finished product is prepared through wet-process lapping. The problem that a polymer matrix is not water-resistant is effectively solved, and the prepared geotextile has high tensile strength, excellent water resistance and chemical corrosion resistance and high soil interface friction performance.