145 results about "Aluminite" patented technology

The invention relates to the technical field of filling materials, and particularly discloses an ardealite-based high-strength anti-seepage filling material and a preparation process thereof, the ardealite-based high-strength anti-seepage filling material comprises 50%-65% of pretreated ardealite, 15%-25% of Portland cement, 5%-15% of superfine slag powder, 5%-10% of electrolytic manganese residues, 5%-8% of silica fume, 3%-6% of metakaolin, 2%-4% of a composite alkali activator and 0.5%-1.2% of a polycarboxylic acid water reducer, 0.3%-0.8% of an organic silicon water repellent and 0.05%-0.1% of cellulose ether; according to the invention, through chemical reaction of Mn < 2 + > in the electrolytic manganese residue and SO4 < 2-> in the phosphogypsum, micron-sized manganite crystals (MnAl2 (SO4) 4. 22H2O) are generated to actively fill internal micro-cracks of the material, so that a filling body is endowed with a self-repairing function and the impermeability is improved, and a composite alkali activator composed of NaOH and water glass is used for synergistically activating potential gelling activity of the superfine slag powder and the silica fume, so that the self-repairing filling material is prepared. And the formation of hydration products is accelerated, and 0.3-0.5 T of pulsed magnetic field is applied in the stirring process, so that the manganite crystals are guided to orderly grow along the expected stress direction of the filling body, and the compressive strength is improved.

The invention belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

The invention relates to the technical field of building materials, in particular to a cementing material for a fabricated wall prepared from multi-element solid waste and a preparation method of the cementing material. The preparation method comprises the following steps: 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurized gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of the metakaolin to the bentonite to the superfine calcium carbonate in the first mixture is 3: 2: 1; the mass ratio of the vermiculite to the expanded perlite to the glass beads in the second mixture is 2: 2: 1. Through the synergistic excitation effect of Ca < 2 + > and Na < + > and the addition of the first mixture and the second mixture, the cementing material forms a more stable microstructure. A hydration product SEM figure shows that C-S-H and C (N)-A-S-H gel are symbiotic to form a three-dimensional network, pores are filled with needle-like ettringite crystals, and in combination with the brucite phase anchoring effect, the mechanical properties, such as strength and durability, of the material are remarkably improved.

The invention discloses a multi-element solid waste synergistic excitation road material and a preparation method thereof. The multi-element solid waste synergistic excitation road material comprises the following raw material components: an activated matrix material (consisting of 85-90% of red mud, 7-15% of carbide slag and 3-5% of ardealite), and silica fume, 1-hydroxyethylidene-1, 1-diphosphonic acid, anhydrous sodium sulfate and water which respectively account for 4-6%, 0.2-0.4%, 0.8-1.2% and 30% of the mass of the activated matrix material. Pores are filled with silica fume in the raw materials, and C-S-H gel with low calcium-silicon ratio is generated, so that a water migration channel is blocked; hydroxyethylidene-1, 1-diphosphonic acid is chelated with free metal ions, saltpetering and ion interference are inhibited, and the ettringite structure is stabilized; carbide slag and ardealite cooperate to destroy a red mud silicon-aluminum network, accelerate dissolution of active ions and promote crystal generation; the anhydrous sodium sulfate accelerates formation of an ettringite framework through exogenous SO4 < 2->; the strength and water stability of the road material can be effectively improved. The raw materials are mainly industrial solid wastes, so that the consumption of natural resources is remarkably reduced, and the efficient collaborative consumption of a large amount of solid wastes is realized.

The invention relates to the technical field of concrete crack repairing agents, in particular to a triggered precipitation type concrete crack repairing agent as well as a preparation method and application thereof. The repairing agent is prepared from the following raw materials: sulphoaluminate cement, nano anhydrite with a core-shell structure, fluorine-phosphorus composite seed crystal, magnesium oxide, metakaolin and a water reducing agent, wherein the core-shell structure nano anhydrite is prepared by coating mesoporous silica with nano anhydrite, and the fluorine-phosphorus composite seed crystal is prepared from calcium fluoride and monocalcium phosphate through a hydrothermal reaction. According to the trigger precipitation type concrete crack repairing agent prepared by the invention, sulfate ions are slowly released through the core-shell structure nano anhydrite, the crystal form of ettringite is regulated and controlled through the fluorine-phosphorus composite seed crystal, the problems that a traditional repairing agent shrinks and falls off in the later period, the high-temperature strength is suddenly reduced, and the binding power is insufficient are solved, and the trigger precipitation type concrete crack repairing agent is suitable for concrete structure crack repairing and high-temperature environment engineering.

According to the preparation method, a composite alkaline solution with a specific pH value is adopted as a mineralization liquid phase medium, a silicon-aluminum activating agent, a mineralization accelerant and a crystal nucleus inducer are combined, CO2 gas is introduced into a liquid phase environment to directly trigger a depolymerization reaction of silicon-oxygen bonds and aluminum-oxygen bonds on the surfaces of fly ash particles, and the mineralization cementing material is obtained. The reaction conditions are easy to realize and control, the mineralized cementing material obtained by the preparation method is a non-cement-based material, and large-dosage fly ash gel is realized through mineralization-organic activation excitation. In addition, a gradient mineralization-directional crystallization process is initiated, the ion concentration and the temperature field of a mineralization system are regulated and controlled by stages, the coal ash is guided to dissociate, CO2 gas is introduced, a silicon-aluminum activating agent and a mineralization accelerant are added, and an intermediate is obtained; and generating the mineralized gelling material containing high-activity C-S-H gel and ettringite crystals from the calcium source substance according to a preset crystallization path.

The invention relates to the technical field of shield tunnel construction, and discloses a shield tunnel segment joint waterproof material and a waterproof structure, the shield tunnel segment joint waterproof material comprises a component A and a component B; the component A comprises the following component: 30-40 parts of liquid polysulfide rubber; 5 to 10 parts of a fluorinated polyurethane prepolymer; 1-5 parts of a silane coupling agent; 3-5 parts of fumed silica; 8-15 parts of hollow glass beads; 10 to 15 parts of nano calcium carbonate; 0.5 to 2 parts of polytetrafluoroethylene micro powder; 0.1 to 1 part of ettringite; the component B comprises the following component: 1-5 parts of manganese dioxide; and 5 to 10 parts of dioctyl phthalate. By utilizing the characteristics that the sealing gasket has excellent fluidity during injection and can be automatically cured into a high elastomer within a set time, a pre-installed sealing gasket can be replaced by adopting an innovative injection process, and the construction difficulty faced by high-precision shield segment assembly in a high-water-pressure environment is effectively solved.

The invention discloses marine concrete resistant to chlorine salt erosion and a preparation method thereof, and belongs to the technical field of building materials. The marine concrete is prepared from the following components in parts by mass: 280 to 350 parts of cementing material, 1100 to 1200 parts of aggregate, 150 to 180 parts of mixing water and 2.5 to 4.0 parts of high-efficiency water reducing agent, and the cementing material is prepared from 210 to 270 parts of ordinary Portland cement, 50 to 70 parts of superfine slag powder and 10 to 20 parts of modifier on the basis of the cementing material; on the basis of the modifier, the modifier is prepared from 30 to 45 parts of hexacalcium aluminoferrite, 25 to 35 parts of metaettringite, 20 to 35 parts of tobermorite, 3 to 6 parts of nano attapulgite and 2 to 4 parts of a nano composite material. The components can accelerate the early hydration of cement and the volcanic ash reaction process in the concrete hardening process, so that the concrete can form a compact microstructure in the curing period and cooperate with the curing effect of a hydration product on chloride ions, thereby remarkably improving the chloride ion penetration resistance of the concrete, prolonging the service life of the structure and improving the concrete quality. The method is suitable for port engineering, maritime work structures and buildings in salinized soil areas.

The invention provides an alkali-salt composite excited low-carbon hydraulic cementing material based on an element compatibility method as well as a preparation method and application thereof, and relates to the technical field of building materials. Silica-aluminum solid waste (mainly providing SiO2 and Al2O3), a sulfate solid waste exciting agent (mainly providing alkali metal oxide and / or alkaline earth metal oxide and SO3) and an alkaline solid waste exciting agent (mainly providing an alkalinity environment required by a hydration reaction) are used as main materials to generate a certain content of hydration product ettringite crystals and C (N)-A-S-H gel, and a compatibility method is adopted for design. The relative contents of Ca, Si, Al and S in a cementing system are adjusted while the alkaline solid waste excitant and the sulfate solid waste excitant are compounded and cooperated to excite the silicon-aluminum solid waste, so that the contents of ettringite crystals and hydrated calcium silicate gel in the whole hydration system are controlled, and the early strength and the later strength of the alkali-salt compounded and excited low-carbon hydraulic cementing material are improved.

This application relates to the technical field of concrete, and specifically discloses a high-strength concrete and its construction method. The high-strength concrete is obtained by subjecting a concrete mixture to in-mold curing. The concrete mixture comprises the following components in parts by weight: 160-165 parts of water, 370-380 parts of portland cement, 88-92 parts of mineral admixture, 58-62 parts of tetracalcium ferroaluminate powder, 720-730 parts of medium sand, 980-1020 parts of crushed stone, and 10.4-18.9 parts of polycarboxylate water reducer. By using tetracalcium ferroaluminate powder to partially replace portland cement in this application, the contents of the gel phase and ettringite increase. Under the combined action of the gel phase and ettringite, the anti-shrinkage performance of the high-strength concrete is enhanced, the cracking phenomenon is better controlled, thereby obtaining a lower compressive-to-flexural ratio, improving the toughness of the concrete, and being beneficial to the long-term service of the high-strength concrete.

The invention discloses a multi-source solid waste-based cementing material and a preparation method thereof, and relates to the technical field of solidified organic matter soft soil cementing materials. The cementing material is prepared from the following raw materials: carbide slag, desulfurized fly ash, yellow phosphorus slag, high-activity and high-stability steel slag, modified red mud, alkaline residues, desulfurized gypsum, mineral slag and calcium sulphoaluminate; the high-activity and high-stability steel slag is prepared by carrying out steel slag preliminary stabilization treatment and steel slag excitation activation on liquid steel slag; exciting and activating the steel slag: preparing high-activity and high-stability steel slag from the stabilized steel slag, the modified ettringite particles, aluminum sulfate, a polycarboxylate superplasticizer, hexadecyl triethyl ammonium bromide and potassium hydroxide; the modified red mud is prepared from red mud, magnesium hydroxide, N-methyldiethanolamine, desulfurized fly ash, calcium oxide and a ferric chloride solution; the modified ettringite particles are prepared from polyvinyl alcohol and N-beta-aminoethyl-gamma-aminopropyl trimethoxy silane as a modifying agent. The preparation method comprises the following steps: preparing the modified ettringite particles; according to the multi-source solid waste-based cementing material, the compressive strength and the water stability coefficient of the solidified organic matter soft soil are effectively improved.

The invention relates to the technical field of mixed gels, in particular to a preparation method and application of a composite solid waste-based cementing material, and the preparation method comprises the following steps: grinding dried granulated blast-furnace slag, steel slag, fly ash, iron tailings, phosphogypsum and Portland cement, mixing to obtain a pretreated powder raw material, adding a modified activator into the pretreated powder raw material, and uniformly mixing to obtain the composite solid waste-based cementing material. And stirring to obtain the composite solid waste-based cementing material. The synergistic effect of the alkaline activator and the sulfate activator is matched with the nucleation induction effect of the mineral modified admixture, so that hydration process synchronization of multiple solid waste components is realized, sulfate, Ca < 2 + > and an aluminum phase quickly generate ettringite, the mineral admixture is used as a crystal nucleus for growth of a hydration product, the hydration induction period is greatly shortened, and the hydration efficiency is improved. The early strength development rate of the material is increased, the later strength is continuously increased without shrinkage, and the engineering pain point of insufficient early strength or later strength stagnation of a traditional solid waste-based material is solved.

The invention provides a catalytic cracking catalyst as well as a preparation method and application thereof. The catalytic cracking catalyst comprises a catalyst component A and a catalyst component B in a weight ratio of 98: 2-20: 80, the catalyst component A comprises the following raw materials: 15-55% of a modified ZSM-5 molecular sieve, 10-55% of clay, 3-20% of an aluminum source and 5-20% of phosphorus from a second modifier; the modified ZSM-5 molecular sieve is obtained by modifying a raw material ZSM-5 molecular sieve by using a first modifier; the first modifier comprises a titanium source and a phosphorus source; and the component B of the catalyst comprises the following raw materials: 15-50% of a Y-type molecular sieve, 10-55% of clay, 5-30% of pseudo-boehmite, 3-20% of a binder and 0-5% of a modified metal element. The invention also provides a preparation method of the catalytic cracking catalyst and application of the catalytic cracking catalyst in a catalytic cracking process.

The invention provides a reinforced ardealite aggregate, an ultra-high performance concrete material and a preparation method thereof, and belongs to the field of building materials. The preparation method of the reinforced ardealite aggregate comprises the following steps: mixing the ardealite, the cement, the primary aluminum ash, the water and the ettringite crystal form control agent to obtain a mixture; carrying out extrusion molding and autoclaved curing on the mixture to obtain phosphogypsum aggregate; the preparation method comprises the following steps: dipping ardealite aggregate in an organic silicon emulsion, and drying to obtain hydrophobic ardealite aggregate; and putting the hydrophobic ardealite aggregate into a strong alkali solution in which carbon dioxide is continuously introduced to react, and drying to obtain the ardealite composite material. The ardealite and the primary aluminum ash react to generate ettringite, and the ardealite and the carbon dioxide react in a strong alkali solution to generate calcite to synergistically improve the strength of the aggregate, so that the reinforced ardealite aggregate disclosed by the invention can be used for preparing an ultra-high performance concrete material with compressive strength higher than 150MPa; the problem of shortage of natural quartz sand resources is solved while ardealite resources and a large amount of accumulated primary aluminum ash resources are consumed.

The present application relates to the technical field of foam concrete preparation, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, the preparation method comprising the following steps: S1. preparation of modified ettringite; S2. dry material premixing; S3. preparation of additives; S4. concrete forming. The modified ettringite and modified calcium sulfate synergize to significantly improve the interfacial bonding strength of aggregate-matrix, so that the early and medium-term compressive strength of the composite system is improved; at the same time, the improved pore structure forms a triple action mechanism of "ettringite reinforcement-pore optimization-stress buffering": ettringite improves the interfacial bonding and shrinkage compensation capacity, the dissolution space of aggregate absorbs the volume deformation stress, the pore structure optimization reduces the humidity diffusion gradient, and the strength-shrinkage synergistic control is realized.

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 present invention provides an alkali-free, fluorine-free, and chlorine-free rapid-setting and early-strength component, which includes an A component and a B component, wherein the mass ratio of the A and B components is 1:(1-2); the A component includes the following raw materials in mass parts: 4-5 parts of aluminum sulfate 18hydrate and 4-5 parts of water; the B component includes the following raw materials in mass parts: 1-2 parts of nanomaterials and 12-13 parts of water; the nanomaterial is a mixture of nano-ettringite and any one of nano-silicon dioxide, nano-aluminum dioxide, nano-titanium dioxide, and nano-hydrated calcium silicate; the content of nano-ettringite in the nanomaterial is not less than 70%. The nano-ettringite in the rapid-setting and early-strength component used in the present application has good dispersibility and does not require an additional dispersant; does not contain fluorine ions, thereby reducing harm to the human body; does not contain chloride ions, thereby effectively avoiding the corrosion harm of chloride ions to steel bars; does not contain sodium and potassium ions, truly achieving alkali-free rapid setting and avoiding strength shrinkage and durability problems in the later stage.

The invention discloses all-solid-waste low-carbon vegetation concrete and a preparation method thereof, and belongs to the technical field of building materials. The all-solid-waste low-carbon vegetation concrete is prepared from a solid waste cementing material, solid waste coarse aggregate, fibers, a water reducing agent and water, the solid waste cementing material is prepared from the following raw materials in parts by mass: 55 to 90 parts of slag powder, 5 to 20 parts of industrial byproduct gypsum, 5 to 12 parts of rice hull ash, 5 to 15 parts of magnesium slag powder and 1 to 3 parts of carbide slag. The all-solid-waste low-carbon vegetation concrete designed by the invention has the advantages of low alkalinity, good durability, high utilization rate of solid waste resources and the like, and is low in total energy consumption and carbon emission due to no addition of cement. In an acid environment, the stability of a hydration product ettringite generated by the gelling system is higher than that of calcium hydroxide, and an obtained solid waste-based gelling material hardened body is more compact, can prevent hydrogen ions in the environment from entering the solid waste-based gelling material hardened body and has excellent acid corrosion resistance.

The application relates to the technical field of building materials, in particular to a cementing material for preparing an assembled wall body from multiple solid wastes and a preparation method; the cementing material is prepared from 25-55 parts of fly ash, 25-65 parts of blast furnace slag, 8-10 parts of lime, 1-5 parts of desulfurization gypsum, 3-6 parts of a first mixture, 2-5 parts of a second mixture and 5-8 parts of an alkali activator; the mass ratio of metakaolin, bentonite and superfine calcium carbonate in the first mixture is 3:2:1; the mass ratio of vermiculite, expanded perlite and glass beads in the second mixture is 2:2:1. The cementing material has a more stable microstructure through the synergistic activation of Ca and Na, and the addition of the first mixture and the second mixture. 2+ and Na + The C-S-H and C(N)-A-S-H gels form a three-dimensional network, needle-shaped ettringite crystals fill pores, and the anchoring effect of brucite phase is combined, so that the mechanical properties, such as strength and durability, of the material are significantly improved.

The invention provides ardealite-based fine aggregate as well as a preparation method and application thereof, and relates to the technical field of building materials. The phosphogypsum, the calcium-based alkaline material and the slag are compounded for use, and the calcium-based alkaline material generates alkaline excitation on the slag to promote rapid dissolution of the slag and participate in a hydration reaction; sulfate in the ardealite excites the slag to generate gelling property, a large number of amorphous phases exist in the slag, the aggregate is gradually hydrated under composite excitation of alkalinity and salt, C-(A)-S-H gel and ettringite are formed, main strength is provided for the ardealite-based fine aggregate, the ardealite-based fine aggregate continues to be slowly hydrated in the curing process, and the curing effect is good. The strength is further improved, and the cylinder compressive strength of the ardealite-based fine aggregate prepared by the embodiment is up to 12.8 MPa. In addition, by adopting a mode of pressing into balls (the pressure is 15-20MPa) through two pressurizing rollers, the compactness of the ardealite-based fine aggregate is improved.

A construction composition comprises a) a cementitious binder comprising one or more calcium silicate mineral phases and one or more calcium aluminate mineral phases; b) optionally, an extraneous aluminate source; c) a sulfate source; d) an ettringite formation controller comprising (i) glyoxylic acid, a glyoxylic acid salt and / or a glyoxylic acid derivative; and (ii) at least one of a borate source and a carbonate source; and e) a polyol in an amount of 0.2 to 2.5 wt.-%, relative to the amount of cementitious binder a). The composition contains 0.05 to 0.2 mol of total available aluminate, calculated as Al(OH)4−, from the calcium aluminate mineral phases plus the optional extraneous aluminate source, per 100 g of cementitious binder a); and the molar ratio of total available aluminate to sulfate is 0.4 to 2.0. The construction composition exhibits high early strength and sufficient open time.

The invention belongs to the technical field of solid waste resources, provides a red-mud-based unfired prefabricated part and a preparation method thereof, and solves the problem that a large amount of red mud cannot be consumed. The concrete is prepared from the following raw materials: 30-35 parts of red mud, 15-20 parts of fly ash, 20-30 parts of quartz sand, 5-8 parts of fluorite, 5-15 parts of desulfurized gypsum, 5-8 parts of Portland cement, 1-3 parts of quick lime, 0.1-1 part of a water reducing agent, 0.5-1 part of a retarder, 2-3 parts of an expanding agent, 1-2 parts of fibers and 10-12 parts of water. According to the method, quicklime is used for providing an alkaline environment, the excitation effect of fluorite and gypsum is activated under the high-alkali condition, F in the fluorite strongly destroys glass bodies of red mud and fly ash to enable the glass bodies to release active silicon oxide, aluminum oxide and other components, sulfate ions in the gypsum are combined with active aluminum ions, and the effect of activating the red mud and the fly ash is achieved. The obtained ettringite improves the early strength of the prefabricated member, and realizes waste reutilization.

The present invention relates to a preparation method of a gypsum-based tile adhesive material, wherein the raw materials of the gypsum-based tile adhesive material include gypsum-based gel material, gypsum sand, dispersible latex powder, and cellulose ether; wherein the content of the gypsum-based gel material is within 40%. Compared with the existing scheme, the technical scheme of the present invention can be controlled to be 30-45% by developing a gypsum-based gel material and using gypsum sand as an aggregate. Moreover, due to the specially formulated gypsum-based gel material and gypsum sand in a water environment, the aluminum and silicon compounds in the raw materials undergo a ceramic reaction in an alkaline environment to form an ettringite structure (AFT) and / or hydrated calcium aluminate (C-S-H), thereby improving the density and water resistance of the tile adhesive solidification slurry, and having water-resistant properties in a real sense.

The application discloses an anti-permeation low-shrinkage inorganic coating and a preparation method thereof. The anti-permeation low-shrinkage inorganic coating comprises cement material 40-60 parts by mass, active mixed material 15-30 parts by mass, gypsum 5-15 parts by mass, talcum powder 5-15 parts by mass, glycerin stearate 0-2 parts by mass and additive 4.7-6.7 parts by mass. The application selects green inorganic material, combines the characteristics of slow hydration of low-heat Portland cement, micro-expansion of high-magnesium low-heat Portland cement and micro-expansion of ettringite-like product formed between gypsum and cement hydration product, uses micro-expansion to relieve the shrinkage problem of the material, makes the material form a dense structure, and makes the material have the hydrophobic anti-permeation characteristics through the saponification reaction of glycerin stearate under alkaline conditions.

The invention provides aluminum electrode corrosion foil by-product-based wet-mixed plastering mortar and a preparation method thereof, and belongs to the technical field of solid waste resource utilization. Calcium hydroxide generated by hydration of cement, calcium sulfate and aluminum hydroxide in the aluminum-containing electrode corrosion foil byproducts and silicon dioxide and aluminum oxide in the fly ash are utilized to generate calcium silicate, calcium aluminate and ettringite gel with cohesiveness and water resistance, the expansion performance of the ettringite gel is utilized, and the corrosion resistance of the aluminum-containing electrode corrosion foil is improved. The cohesiveness and the strength of the mortar are further enhanced, and the crack resistance and the water resistance of the mortar are improved; the dispersing agent is added to improve the dispersity of the raw materials; by adding the air entraining agent, the viscosity of the mortar is reduced, and the crack resistance and toughness are improved; by limiting the mass content of each raw material, the performance of the wet-mixed plastering mortar can meet the standard requirements; and the uniformity and construction performance of the mortar are ensured by limiting the particle size of the aluminum electrode corrosion foil byproduct and the consistency of the wet-mixed plastering mortar.

This CO2-immobilizing expansive material contains an ettringite-forming compound that forms ettringite. The ettringite-forming compound preferably contains free lime as a mineral composition.

The application discloses a kind of heavy metal wastewater continuous treatment methods rich in sulfate, belong to environmental management technical field.The method relies on adjusting tank, reaction tank, oxidation tank, sedimentation tank, transfer tank and filter press equipment, and uses calcium aluminate crystal lattice solidification method to treat wastewater: first, wastewater pH is adjusted to 7.0~8.0 by alkaline compound, then calcium source heavy metal removal agent A, oxidizing agent heavy metal removal agent B and aluminum source heavy metal removal agent C are added respectively, the pH of wastewater after reaction is controlled to 9.0~11.0, and the solid-liquid separation is carried out by filter pressing after 0.5h~1.5h continuous reaction.The method permanently fixes heavy metal ions in calcium aluminate crystal lattice through ion exchange, solves the problems of low efficiency, secondary pollution of sulfide and large amount of hazardous waste sludge in traditional chemical precipitation method, and realizes continuous and cooperative deep removal of sulfate and heavy metals.The filtrate meets the discharge standard, and the filter residue has no leaching toxicity, which can be used as foundation cushion and mine soil covering for secondary utilization.The method is efficient, low in cost, and suitable for industrial continuous treatment.

The invention relates to the technical field of preparation of foam concrete, in particular to foam concrete based on ettringite micro-expansion effect and a preparation method thereof, and the preparation method comprises the following steps: S1, preparing modified ettringite; s2, dry material premixing; s3, preparing an additive; and S4, concrete forming. The modified ettringite and the modified calcium sulfate have a synergistic effect, so that the bonding strength of an aggregate-matrix interface is remarkably improved, and the early-and-middle-stage compressive strength of a composite system is improved; and meanwhile, the improved pore structure forms a triple action mechanism of'ettringite enhancement-pore optimization-stress buffering ': the ettringite improves the interface bonding and shrinkage compensation capability, the aggregate dissolution space absorbs the volume deformation stress, and the pore structure is optimized to reduce the humidity diffusion gradient, so that strength-shrinkage cooperative control is jointly realized.

A zero-discharge treatment process for salt-containing wastewater belongs to the field of water treatment, and comprises the following steps: high-salt wastewater enters a primary reaction device, ettringite precipitation is generated by using an ultrahigh lime aluminum method and the wastewater to remove sulfate ions in the water, and a flocculating agent is added for precipitation; the second-stage reaction device adopts a dual-alkali method to remove hardness, calcium and magnesium ions in water and metal ions generated by an ultrahigh lime-aluminum method; hydrochloric acid is added behind an effluent weir of the inclined tube sedimentation tank, and effluent enters a sand filter; the high-salinity wastewater is filtered by the sand filter, and the effluent enters an ultrafiltration device; an ion exchanger deeply removes metal cations or sulfate ions in water, and effluent enters an ozone nano microbubble reactor; organic matters in water are removed by the ozone nano microbubble reactor, and effluent enters a reverse osmosis device; the reverse osmosis device is used for concentrating and reducing the wastewater, and evaporative crystallization is carried out; water is concentrated through evaporative crystallization, and produced sodium chloride resources are recycled. The method is used for zero discharge treatment of salt-containing wastewater.

The present invention provides a grouting material for gypsum / glauber's salt karst foundations, a preparation method, and an application thereof. The grouting material for gypsum / glauber's salt karst foundations comprises the following components by weight: 70 to 92 parts blast furnace slag powder, 8 to 30 parts steel slag powder, and 250 to 350 parts water. The blast furnace slag powder and steel slag powder of the grouting material provided by the present invention undergo high-temperature melting and rapid cooling during their formation, resulting in a relatively dense and stable structure. This structural stability prevents hydration reactions with water. When the grouting material reaches an environment containing gypsum / glauber's salt, the calcium oxide and aluminum oxide in the blast furnace slag powder and steel slag powder react with sulfate ions in the gypsum / glauber's salt to form ettringite, which adheres to the gypsum / glauber's salt interlayer, thereby blocking dissolution and improving the stability of the gypsum / glauber's salt karst foundation.