1360 results about "Aluminium salts" patented technology

The invention belongs to the field of electrode materials, and relates to a cement-based electrode material capable of 3D printing and a preparation method and application thereof. The cement-based electrode material comprises 500 to 600 parts of cement, 10 to 25 parts of aluminum sulfate, 70 to 84 parts of surface activated carbon black, 150 to 300 parts of surface modified quartz sand, 7.5 to 15 parts of carbon fiber, 500 to 600 parts of water and 6 to 10 parts of a water reducing agent. The material has excellent mechanical properties and electrical properties, can realize integration of energy storage and structural functions, has high practical application value, and is especially applicable to the fields of intelligent building materials and green energy storage. And through the 3D printing technology, complex structure customization of the cement-based material can be achieved, structural energy storage integration is expected to be achieved, and a new thought is provided for development of a smart energy system in the building field.

The invention provides a mining inorganic environment-friendly reinforcing material and application thereof, and belongs to the technical field of mining reinforcing materials. A component A comprises the following components in parts by mass: 60-80 parts of anhydrite, 5-20 parts of lime, 5-10 parts of silica fume, 2-8 parts of sodium silicate, 1-0.5 part of a naphthalene water reducer, 3-7 parts of an early strength agent and 0.2-0.8 part of lithium salt; the component B comprises the following components in parts by mass: 50-70 parts of cement clinker, 10-30 parts of slag cement, 5-10 parts of iron powder, 1-8 parts of aluminum sulfate, 5-10 parts of calcium carbonate and 0.5-1 part of sodium tripolyphosphate; the component C is prepared from the following components in parts by mass: 10 to 25 parts of water glass, 10 to 20 parts of emulsion, 40 to 60 parts of water, 5 to 10 parts of high-efficiency water reducing agent and 1 to 5 parts of triethanolamine. The mining inorganic environment-friendly reinforcing material provided by the invention is low in reaction heat and is not easy to cause coal combustion.

The invention belongs to the technical field of organic pollution treatment, and relates to a biochar-LDH-nZVI-GO composite material for organic pollution remediation and a preparation method and application thereof.The preparation method comprises the steps that graphene oxide is ultrasonically dispersed in deionized water, magnesium salt and aluminum salt are added to form uniform suspension liquid, then the uniform suspension liquid is mixed with biochar suspension liquid, and the biochar-nZVI-GO composite material is obtained; carrying out pH (Potential of Hydrogen) regulation and a hydrothermal crystallization reaction, so as to prepare a biochar-Mg / Al-LDH-GO compound; and dispersing the compound in an organic solvent, sequentially adding FeSO4. 7H2O and a NaBH4 solution in an inert atmosphere to carry out a reduction reaction, and finally washing and drying to obtain the biochar-LDH-nZVI-GO composite material. The material shows high-efficiency removal capacity on various organic pollutants such as trichloroethylene, chlorobenzene and polychlorinated biphenyl, is suitable for high-efficiency green remediation of organic pollutants in soil and water, and has good popularization and application prospects.

The invention belongs to the technical field of catalysts, and particularly relates to an alumina-based catalyst for anthraquinone hydrogenation and a preparation method thereof.The preparation method comprises the following steps that 1, aluminum salt and PVP are added into deionized water, and an aluminum salt mixed solution is obtained; (2) adding ammonium salt and cyclic polysaccharide micromolecules into deionized water to obtain an ammonium salt mixed solution; (3) dropwise adding the aluminum salt mixed solution into the ammonium salt mixed solution while stirring, and performing aging, suction filtration, drying and calcination to obtain an alumina carrier; (4) impregnating the alumina carrier with a palladium salt solution; and (5) drying, roasting and reducing the impregnated alumina carrier to obtain the alumina-based catalyst for anthraquinone hydrogenation. Macromolecular PVP (Polyvinyl Pyrrolidone) and cyclic polysaccharide micromolecules are used as composite template agents for ammonium-aluminum coprecipitation, so that not only is an alumina carrier material with a high specific surface area prepared, but also the loading capacity on palladium is improved, the dispersion of palladium is promoted, and the hydrogenation efficiency is favorably improved.

The invention discloses a preparation method of a fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate, which comprises the following steps: carrying out heat treatment on fly ash, cooling, adding into a sulfuric acid solution, stirring and mixing, carrying out solid-liquid separation, adding sodium hydroxide into a liquid product to adjust the pH value to 4.5-6 to obtain an aluminum hydroxide precipitate, washing and roasting to obtain aluminum oxide, and drying to obtain the fly ash-Al-MOF material loaded with sodium percarbonate and acid-containing ferrous sulfate. The preparation method comprises the following steps: mixing fly ash-Al-MOF with a sulfuric acid solution to obtain an aluminum sulfate solution, uniformly mixing the aluminum sulfate solution with a phthalic acid solution, carrying out solid-liquid separation, washing a solid product, carrying out freeze drying to obtain fly ash-Al-MOF, and respectively loading sodium percarbonate and acid-containing ferrous sulfate on the fly ash-Al-MOF to obtain fly ash-Al-MOF loaded with sodium percarbonate and fly ash-Al-MOF loaded with acid-containing ferrous sulfate; and uniformly mixing the two components to obtain a finished product. Compared with the existing method, the material prepared by the invention can realize long-term, stable, effective and environment-friendly remediation of the organic polluted soil, and the remediation efficiency is high.

The invention relates to the field of chemical engineering, and particularly discloses multi-component composite coated titanium dioxide and a preparation method thereof. The preparation method of the titanium dioxide comprises the following steps: S1, mixing titanium dioxide slurry with a silicate solution, and then controlling the pH value by using an inorganic acid solution twice; s2, adding a zirconate solution within a certain period of time, and controlling the pH value by using an alkali solution; s3, adding a meta-aluminate solution within a certain period of time, and meanwhile, adding an inorganic acid solution in a countercurrent manner to control the pH value; s4, continuously adding a meta-aluminate solution within a certain period of time, and simultaneously adding an aluminum sulfate solution in a downstream manner to control the pH value; and S5, adjusting the pH value at the end point, continuously stirring and curing, and then homogenizing, filtering, washing, dehydrating, drying, crushing and carrying out organic treatment. The titanium dioxide prepared by the invention is relatively good in optical performance index and weather resistance, and can meet the development requirements of coatings in the fields of ships, bridges, solar energy, wind power and the like which are high in weather resistance and emerging in environmental protection.

The invention discloses a preparation method of a spherical cerium-based abrasive material with high hardness and high Ce < 3 + > content. The method comprises the following steps: 1, carrying out hydrothermal reaction on cerium salt and aluminum salt in an ethylene glycol solution to generate a cerium-based abrasive precursor; 2, firing the cerium-based abrasive precursor to obtain a cerium oxide spherical abrasive doped with aluminum oxide; and 3, reducing the cerium oxide spherical abrasive by sodium borohydride to obtain the spherical cerium-based abrasive with high hardness and high Ce < 3 + > content. According to the method, aluminum ions are doped into the cerium oxide spherical abrasive through a one-step hydration method, the hardness of the abrasive is improved, meanwhile, a large amount of Ce < 4 + > is efficiently and rapidly reduced into Ce < 3 + > ions through an in-situ reduction method, and the polishing efficiency of the abrasive is improved. The cerium-based abrasive synthesized by the method is uniform in granularity, good in morphology, high in hardness and high in Ce < 3 + > content, and the polishing rate of silicon carbide can be remarkably increased and the surface roughness can be remarkably reduced when the cerium-based abrasive is prepared into a silicon carbide polishing solution; and the preparation method is simple, good in repeatability, green and environment-friendly, and beneficial to industrial production.

The invention relates to a Fenton-like functional filler which is prepared from 10-20% of iron particles coated with a carbonized film, 10-20% of aluminum sulfate modified straw, 20-30% of PBAT-coated calcium peroxide, 20-30% of diatomite and 10-30% of an adhesive. A processing method of a Fenton-like functional filler comprises the following steps: uniformly mixing iron particles coated with a carbonized film, aluminum sulfate modified straws, PBAT-coated calcium peroxide and diatomite, then adding an adhesive, mixing isocyanate serving as the adhesive with polyol according to a volume ratio of 1: 5, and continuously and uniformly mixing; then the mixed raw materials are injected into a mold coated with a release agent in advance, the mold temperature ranges from 40 DEG C to 60 DEG C, the foaming curing time ranges from 15 min to 20 min, and the Fenton-like functional filler can be obtained. The invention relates to an application of a Fenton-like functional filler in constructed wetlands. The method has the beneficial effects that the method is not influenced by temperature, and the removal effect of the constructed wetland on nitrate nitrogen and refractory COD (Chemical Oxygen Demand) can be obviously enhanced.

The invention relates to the technical field of saline-alkali soil improvement, and discloses a composite improved saline-alkali soil composition based on biomass charcoal and a preparation method thereof.Biomass charcoal, glucose, lactic acid bacteria, saccharomycetes, aluminum sulfate and a quaternary ammonium salt modifier are added into a stirrer to be stirred and mixed, stirring is conducted, and a mixture is obtained; and obtaining the composite improved saline-alkali soil composition based on the biomass charcoal. A quaternary ammonium salt group in the quaternary ammonium salt modifier can reduce the pH value of the soil and reduce the alkalinity of the soil, so that the salinization condition of the soil is improved, and quaternary ammonium salt can promote the activity of soil microorganisms and improve the fertility of the soil and the growth environment of crops; the siloxane is converted to be neutral by adjusting the pH value of the soil, the siloxane is beneficial to reducing the alkalinity of the soil, and a more suitable growth environment is provided for plants; wherein the contained boric acid group reduces the pH value of the soil by neutralizing alkaline substances in the soil, and has a relatively good improvement effect on the saline-alkali soil.

The invention provides a CO2 mineralized cementing material based on steel slag-mineral slag-fly ash multi-element solid waste and a preparation method, and relates to the technical field of building materials. The CO2 mineralized cementing material based on the steel slag-slag-fly ash multi-element solid waste is prepared from the following raw materials in parts by mass: 10 to 15 parts of steel slag, 30 to 40 parts of slag, 50 to 60 parts of slag fly ash, 5 to 20 parts of gypsum, 1 to 5 parts of clinker, 1 to 5 parts of cement, 5 to 20 parts of exciting agent, 4 to 6 parts of cross-linking agent composition, 0.1 to 0.5 part of alkaline water and 0.1 to 0.5 part of defoaming agent. According to the invention, the steel slag, the furnace slag and the furnace slag fly ash are excited by adopting a composite exciting agent of aluminum sulfate, calcium aluminate and sodium hydroxide, the problem of early strength is successfully solved through alkali excitation and aluminate excitation, the proportion of the exciting agent is reasonably configured, the effect of the exciting agent is exerted to the maximum extent, and the mechanical strength of the CO2 mineralized cementing material is improved.

The invention discloses a composite water purifying agent based on polyaluminum ferric sulfate. The preparation process comprises the following steps: 1, reacting ferrous sulfate heptahydrate, aluminum sulfate, sodium chlorate, phosphoric acid and the like to prepare a polyaluminum ferric sulfate solution; 2, mixing the modified polyacrylamide solution with the polyaluminum ferric sulfate solution for reaction to obtain a composite system; and step 3, adding acidic ochre soil into the composite system to obtain the composite water purifying agent. The preparation method has the beneficial effects that a modified monomer is prepared through organic synthesis, and the modified monomer is copolymerized with monomers such as acrylamide to prepare modified polyacrylamide; then, the organic polymer is compounded with a polyaluminum ferric sulfate solution and acidic ochre soil, and an inorganic-organic-mineral ternary water purification system is constructed; the composite water purifying agent has the high-efficiency electricity neutralization capability of an inorganic flocculating agent, the bridging flocculation effect of organic macromolecules and the adsorption performance of minerals, and shows excellent flocculation and sedimentation effects and pollutant removal capability.

The invention relates to pseudo-boehmite and a preparation method thereof, and belongs to the technical field of porous alumina preparation. The method comprises the following steps: carrying out neutralization reaction on aluminum sulfate and an alkali source to obtain pseudo-boehmite colloidal particle slurry; aging the pseudo-boehmite colloidal particle slurry to obtain aged slurry with a set pH value; carrying out solid-liquid separation on the aged slurry to obtain a solid-phase substance; and washing the solid-phase substance for multiple times by using an alkaline solution containing ammonium ions so as to remove sulfate radicals carried by the solid-phase substance, thereby obtaining the pseudo-boehmite. Through the synergistic effect of the aging slurry with the set pH value and the alkaline solution containing ammonium ions, the content of sulfate radicals in the pseudo-boehmite is specifically reduced.

The invention relates to the technical field of soil remediation, in particular to a soil ecological remediation agent based on coal gangue-fly ash and a preparation method of the soil ecological remediation agent. The soil ecological restoration agent comprises the following components in parts by weight: 40-50 parts of coal gangue-fly ash mixed powder, 6-12 parts of a microbial agent, 15-20 parts of humic acid, 6-12 parts of sodium polyacrylate, 8-12 parts of straw carbon, 20-25 parts of bentonite and 4-6 parts of aluminum sulfate. The soil ecological restoration agent can supplement trace elements into soil, meanwhile, the coal gangue-fly ash can adsorb heavy metals in the soil so as to fix the heavy metals, the microbial agent can be loaded on the surface of the coal gangue-fly ash, the heavy metals adsorbed on the coal gangue-fly ash are precipitated through the microbial agent, and the heavy metals adsorbed on the coal gangue-fly ash can be fixed. The concentration of heavy metal ions in the soil is reduced.

The invention discloses a preparation process and application of a chemical flocculant for textile printing and dyeing wastewater treatment, and the preparation process comprises the following steps: selecting chitosan and starch as main raw materials, modifying the starch through oxidation treatment or cationization treatment, and combining aluminum salt, ferric salt, citric acid and lactic acid according to a specific ratio, so as to obtain the chemical flocculant for textile printing and dyeing wastewater treatment. Synthesizing a stable composite material under the condition of controlling the temperature and the pH value; the preparation method comprises the following steps: preparing a composite material, drying the composite material, crushing the dried composite material into a powdery flocculating agent with uniform particle size, and finally mixing the powdery flocculating agent with a polyacrylamide auxiliary agent to prepare the efficient flocculating agent. The method is suitable for treating wastewater with high chroma and refractory organic matters.

The invention discloses a ceramic rock plate with a decorative effect and a production process thereof, and belongs to the technical field of ceramics. The rock plate is composed of a green body layer, a ground glaze layer, a cover glaze layer and an ink jet pattern layer, and after firing, a micro-nano rough and low-surface-energy synergistic protection layer is formed through oxygen-nitrogen plasma activation, a hydrothermal reaction of aluminum salt and an ammonia source compound, high-temperature calcination and silane derivative dipping and curing. The green body takes wollastonite, quartz sand and the like as raw materials, and the ground glaze and the cover glaze adopt a feldspar-quartz-nepheline system; after firing, performing plasma treatment and hydrothermal treatment to generate needle-shaped aluminum oxide, and introducing a silane derivative to realize double functions of super-hydrophobicity and wear resistance. Compared with the prior art, the anti-fouling and wear-resistant coating reaches the national standard 5 level, the process is simple, and the coating can be directly connected to an existing production line and is suitable for high-end wall floor decoration.

The invention provides eutectic aqueous aluminum ion battery electrolyte as well as a preparation method and application thereof, and relates to the technical field of aluminum ion batteries. According to the invention, the eutectic aqueous aluminum ion battery electrolyte is prepared by solid-solid mixing and dissolving of aluminum metal salt and eutectic substances; the aluminum metal salt is selected from at least one of aluminum chloride hexahydrate, aluminum perchlorate nonahydrate, aluminum nitrate nonahydrate and aluminum sulfate octadecahydrate; the eutectic substance is an organic small molecule compound containing amino and ester groups. By screening hydrated aluminum metal salt and eutecticevaporate substances and regulating and controlling the proportion, the prepared electrolyte is applied to aqueous aluminum ion batteries, such as symmetrical batteries and total batteries, and shows excellent performance. According to the electrolyte, the stability of the aluminum ion battery can be improved, a solvation structure dominated by anions is formed, and meanwhile, a compact anion-rich solid electrolyte interface layer is formed on the surface of an aluminum negative electrode to protect the aluminum negative electrode. The problem that an existing water-based aluminum ion battery negative electrode is poor in stability is solved.

A lime-based cement extender composition and associated systems and methods are disclosed herein. A lime-based binder or cement extender includes lime particles comprising calcium hydroxide and / or calcium oxide, pozzolan particles including silicon dioxide and / or aluminum dioxide; and an admixture. The admixture is configured to promote reactions between the lime particles and the pozzolan particles. When the composition is mixed with cement to form a cement blend, calcium aluminum sulfate forms within 28 days of blending. Additionally or alternatively, the cement blend can have a Strength Activity Index (SAI) of at least 90%.

The present invention relates to a preparation method of a flame-retardant, high-refractive-index, melt-drop-resistant water-based acrylate resin coating. Water, an emulsifier, and methacrylic acid are added to a reaction vessel and stirred for reaction, and then monomer A, DOPO, and N-vinylcarbazole are added; the temperature is raised to 75-85 °C, an initiator is added dropwise, and the reaction is carried out for 1-2 h to obtain a core-layer emulsion; at the same time, all of monomer B and the initiator are added dropwise, and the reaction is stirred for 1-2 h, then DOPO is added, the temperature is lowered to 50 °C, emulsifier B is added, the reaction time is 30-60 min, then N-vinylcarbazole is added, and the reaction is carried out for 0.25-0.5 h. Then, an ammonium polyphosphate solution, aluminum sulfate, and a chitosan / gelatin composite microsphere are added, and high-speed shear emulsification is carried out, and the pH value is adjusted to 7-8 to obtain a flame-retardant, high-refractive-index, melt-drop-resistant water-based acrylate resin coating; the obtained acrylate resin coating has the advantages of a high oxygen index, no melt dripping during combustion, and a high film refractive index.

The invention discloses an alkali-free accelerator and a preparation method and application thereof in the technical field of concrete additives, and the alkali-free accelerator provided by the invention comprises the following components in percentage by mass: 40%-50% of aluminum sulfate, 10%-15% of magnesium sulfate, 0.2%-0.6% of diethanol amine, 0.5%-1% of catechol-4-ammonium sulfonate, 5%-10% of a stabilizer and the balance of water. The stabilizer comprises silicate dispersion liquid and silica sol. The alkali-free accelerator provided by the invention can be used for spraying concrete, the mixing amount of the alkali-free accelerator is generally 4-6% of the mass of cement, the alkali-free accelerator is good in rapid setting effect and has excellent early and later compressive strength, and meanwhile, the alkali-free accelerator has relatively excellent stability.

The present invention relates to the technical field of preparation of adsorbent materials for removing heavy metals from acidic wastewater, specifically a method for preparing a resin-based magnetic composite adsorbent material, comprising the following steps: using waste expanded resin as a base carrier, ferric chloride as an added magnetic auxiliary substance, mixing magnesium sulfate and aluminum sulfate evenly, stirring at high speed and ultrasonic dispersion, then adding sodium phosphite and sodium hypophosphite and placing them in a microwave reactor, adjusting the pH of the sodium phosphite and sodium hypophosphite in the reactor to precipitate, while the phosphite intercalates into the precipitate, finally filtering the precipitate and washing and drying to obtain a novel adsorbent material for excellent adsorption of heavy metals in acidic mine wastewater. The material prepared by the present invention can effectively adsorb various heavy metal ions such as cadmium, chromium, zinc, lead, manganese, copper, etc. in acidic mine wastewater, has a large adsorption capacity, and the adsorbent material has magnetism and can be regenerated by solid-liquid separation through magnetism.

The invention provides a preparation method of nano high-purity aluminum oxide and the nano high-purity aluminum oxide, and belongs to the field of aluminum oxide semiconductor materials. Comprising the following steps: obtaining a high-purity aluminum sulfate solution; carrying out continuous synthesis reaction on the high-purity aluminum sulfate solution and the high-purity ammonium bicarbonate solution at a set temperature, and then filtering and washing to obtain a high-purity nano aluminum oxide hydrate filter cake; preparing the high-purity nano aluminum oxide hydrate filter cake into slurry, and then performing spray drying to obtain high-purity nano aluminum oxide hydrate powder; and carrying out two-stage roasting on the high-purity nano aluminum oxide hydrate powder to obtain the nano high-purity aluminum oxide. By controlling the continuous synthesis reaction of aluminum sulfate and ammonium bicarbonate under a constant system condition, the ordered precipitation and batch-to-batch stability of the high-purity nano aluminum oxide hydrate are ensured, and the content of aluminum oxide in the nano aluminum oxide hydrate is increased. Therefore, the amount of waste gas generated by a traditional ammonium salt method is reduced, and meanwhile, the application performance of the nano high-purity aluminum oxide is improved.

The present invention discloses a low-temperature resistant and early-strength type alkali-free liquid accelerating agent and its preparation method, belonging to the technical field of alkali-free liquid accelerating agents. The composition includes 12-15 parts of aluminum sulfate, 2-5 parts of sodium thiocyanate embedded by β-cyclodextrin, 5-8 parts of calcium hydroxide deactivator, 3-5 parts of fiber, 5-10 parts of hydrophilic polymer substance, 3-5 parts of cationic surfactant, 6-10 parts of polyaluminum chloride, and 2-3 parts of air-entraining agent. The low-temperature resistant and early-strength type alkali-free liquid accelerating agent of the present invention can improve the frost resistance of sulfate alkali-free accelerating agents, reduce the viscosity of cement slurry, promote the hydration reaction of C3S, shorten the setting time of concrete, and improve the later strength of concrete.

The invention relates to a low-cost composite metal catalyst which is a CuO / ZnO / Al2O3 composite metal catalyst, and the molar ratio of CuO to ZnO to Al2O3 is (6-4): (3-4): (0.5-1). The composite catalyst is prepared by the following steps: adding carbonate into a mixed salt aqueous solution of copper salt, zinc salt and aluminum salt for co-precipitation, grinding a filter cake, and roasting at high temperature. According to the catalyst, 1, 12-dodecanedioic acid dimethyl ester which is low in price and easy to obtain can serve as a raw material, 1, 12-dodecanediol is prepared through catalytic hydrogenation under the milder condition compared with the prior art, high yield and low cost are achieved on the premise that the process condition control difficulty is greatly reduced and the process safety is improved, and the problems that in the prior art, 1, 12-dodecanedioic acid dimethyl ester is synthesized, and the cost is low are solved. The technical problems of high energy consumption, expensive catalyst, harsh reaction conditions and difficult realization of industrial production in the reaction process of 1, 12-dodecanediol in the prior art are solved.

A carbon fixation material for adsorbing heavy metals in soil and a preparation method thereof are provided. The carbon fixation material includes modified biochar, calcium silicate, aluminum sulfate, hydroxymethyl cellulose and urea. The modified biochar is prepared by preparing biochar from agricultural and forestry waste, and modifying the biochar with ferric chloride and a mercapto silane coupling agent. The carbon fixation material has excellent carbon fixation capacity, the biochar is prepared by processing agricultural and forestry waste, the material source is green and environmentally friendly, can reduce environmental pollution. After modified by ferric chloride and mercapto silane coupling agent, the biochar has excellent adsorption amount and adsorption capacity for heavy metal ions and has strong retention capacity after adsorption, the modified biochar can be widely used in soil carbon fixation and heavy metal pollution treatment.

The invention relates to the technical field of water treatment, and particularly discloses a crystal nucleus granulation induced hardness removal integrated water treatment process which comprises the following steps: firstly, ultrasonically dispersing nano-hydroxyapatite in deionized water, adding gamma-glycidoxypropyltrimethoxysilane for reaction, and treating to obtain a silanized hydroxyapatite crystal nucleus; the sodium polyacrylate reacts with aluminum sulfate and the like in an ethylene glycol solution to prepare the composite inducer. The preparation method comprises the following steps: reacting the two components in a phosphate buffer solution in proportion to obtain inducer-loaded crystal nucleus particles, carrying out multi-step reaction and treatment on the inducer-loaded crystal nucleus particles with calcium chloride and the like to obtain surface-coated crystal nucleus granulation bodies, and mixing the surface-coated crystal nucleus granulation bodies with cationic polyacrylamide and nano-zinc oxide to prepare the reinforced hardness removal agent. When to-be-treated water is treated, the reinforced hardness removal agent is added, stirring and precipitation are performed, supernate sequentially passes through the activated carbon filter column to adsorb impurities and is sterilized by the ultraviolet disinfection device, and finally effluent is collected, so that the hardness in the water can be efficiently removed, the process integration level is high, and the effect is good.

The invention belongs to the technical field of high-molecular flame retardants, and relates to a method for preparing spherical aluminum hypophosphite with a rough surface at low temperature and normal pressure, which comprises the following steps: adding aluminum sulfate hexahydrate into deionized water for dissolving according to a certain molar ratio, adding sodium hypophosphite monohydrate into deionized water and ethylene glycol for dissolving, and stirring under the condition of mechanical stirring to obtain spherical aluminum hypophosphite; the preparation method comprises the following steps: dropwise adding an aluminum sulfate hexahydrate aqueous solution into a sodium hypophosphite monohydrate solution at a relatively low temperature to obtain a mixed solution, heating in a water bath to 90 DEG C, reacting with the mixed solution to generate aluminum hypophosphite, washing the prepared aluminum hypophosphite slurry with deionized water and absolute ethyl alcohol in sequence, centrifuging, drying in vacuum, and grinding to obtain the spherical aluminum hypophosphite. Under general double decomposition reaction conditions, the spherical aluminum hypophosphite is synthesized at low temperature and normal pressure by controlling the dropwise adding temperature of the raw materials and adopting water and ethylene glycol as a mixed solvent. The prepared aluminum hypophosphite is excellent in morphology, narrow in particle size distribution and good in dispersity.

The invention relates to the technical field of lithium recovery, and in particular to a comprehensive utilization process of low-grade clay-type lithium resources, comprising the following steps: S1. grinding raw ore into fine particles, and then sequentially performing constant temperature roasting, constant temperature acid leaching, filtering and washing to obtain leaching residue and leaching solution; S2. adding ammonium sulfate to the leaching solution, filtering to obtain a crude ammonium aluminum sulfate product and a crystallization tail liquid; S3. adding new acid and water to the crystallization tail liquid, and then using it for constant temperature acid leaching again; S4. repeating steps S1-S3 for many times to obtain a lithium-rich crystallization tail liquid; S5. concentrating the lithium-rich crystallization tail liquid, adding NaOH to remove impurities, and then evaporating and concentrating, cooling, crystallizing and filtering to obtain sodium sulfate crystals; S6. precipitating lithium carbonate on the lithium-rich crystallization tail liquid; the aluminum in the leaching solution of the invention is efficiently separated, and an ammonium aluminum sulfate product is prepared; the lithium resources are effectively enriched, and finally a green and efficient comprehensive utilization process of clay-type lithium ore with almost no tail and no wastewater discharge is realized.

The invention discloses a method for preparing a core-shell structure phase hydrorefining catalyst, comprising the following contents: (1) gelling, aging and filtering a first precipitant, a sodium molybdate solution and a solution containing Ni and Si to obtain a filter cake of a first slurry, and then treating it with a mixed aqueous solution of aluminum salt and organic alcohol to obtain a mixed slurry; (2) adding a Ni-containing solution, a sodium tungstate solution, a second precipitant and the mixed slurry obtained in step (1) to a reactor containing water and an oily liquid to gel and age them to generate a second slurry; (3) filtering, drying and molding the slurry to obtain a molded product; (4) soaking the molded product in an organic acid solution, and desalting the soaked molded product to obtain a catalyst. The preparation process of the method is clean and pollution-free, and the prepared catalyst has a core-shell structure, a large pore volume and a large pore size, and is used in processes such as distillate hydrodesulfurization and denitrogenation, and has high hydrodesulfurization and hydrodenitrogenation reaction performance.

The invention discloses a quick-setting high-strength expansive type leakage crack plugging material and method and application, and belongs to the technical field of cement-based material admixtures, the quick-setting high-strength expansive type leakage crack plugging material is prepared by adopting a mixing method, and the quick-setting high-strength expansive type leakage crack plugging material comprises a base material formed by compounding cement, desulfurized gypsum, calcium oxide, alkaline aluminum oxide, calcium formate, hydrated calcium silicate, carboxyl cellulose and a solid polycarboxylate superplasticizer; the active component is formed by compounding polyaluminum sulfate, magnesium sulfate, disodium ethylene diamine tetraacetate, borax and a defoaming agent; the superfine fly ash, the superfine silicon dioxide, the superfine hydroxyapatite, the superfine zinc sulfate, the nano titanium dioxide and the superfine boron nitride are compounded to form a structure regulating functional component. The three components are uniformly stirred by adding water, and then are mixed with an exciting agent to be used for plugging leakage cracks and filling gaps. The leakage plugging material provided by the invention has the advantages of scientific and reasonable composition, simple preparation and application methods, rapid curing, high strength, good durability, micro-expansion and the like, and has good plugging and filling effects on water bursting, water permeation and gas.

The invention relates to the technical field of concrete admixture accelerators, in particular to an emulsion type alkali-free accelerator and a preparation method thereof.The emulsion type alkali-free accelerator is prepared from, by weight, 50-75 parts of coagulation accelerating component, 5-15 parts of fluosilicate, 15-25 parts of aluminum formate modified aluminum sulfate, 6-12 parts of complexing component, 8-15 parts of early strength component, 2-4 parts of suspension component, 1-3 parts of pH adjusting component and 0.5-1 part of anti-caking component; and 6-10 parts of a modified polyacrylic acid polymer. The early-strength liquid alkali-free setting accelerator has excellent setting effect and good product stability, can be compounded with an early-strength component to obtain the early-strength liquid alkali-free setting accelerator, can give consideration to both product stability and early strength performance, and is good in early strength and not prone to precipitation.