339 results about "Calcium nitrate" patented technology

The invention discloses light self-repairing concrete and a preparation method thereof, and relates to the technical field of concrete. The method comprises the following steps: firstly, efficiently packaging a calcium nitrate solution in hollow glass beads by utilizing a negative pressure impregnation technology; then growing a porous zeolite crystal coating on the surface of the microbead in situ by adopting a sol-gel method to form a self-repairing filler with a core-shell-hole gradient structure; when the concrete cracks to cause the cracking of the microbeads, the Ca < 2 + > in the cavity is quickly released, and the Ca < 2 + > adsorbed in the zeolite layer is gradually dissociated along with water permeation, so that the new microcracks are continuously repaired. Then, uniformly coating the surface and pores of the carboxymethyl cellulose hydrogel network with polydopamine in an in-situ oxidative polymerization manner to form composite hydrogel with photo-thermal responsiveness; lighting and heating to trigger dynamic coordination bond dissociation; meanwhile, heat drives rapid directional crystallization of a repair product by promoting the ion diffusion rate, and a compact mineralization layer is formed. The concrete prepared by the invention has the effects of light weight and self-repairing.

The invention belongs to the field of materials, and relates to a silica brick and a preparation method thereof. According to the invention, calcium nitrate tetrahydrate and ferrous nitrate are taken as mineralizing agents, CaO and FeO which are high in activity and are uniformly distributed are provided for the silica brick in the sintering process, and the problems that the mineralizing agents are difficult to uniformly disperse and Fe < 2 + > is easy to oxidize when lime milk and iron scale are taken as the mineralizing agents in the existing silica brick preparation technology, so that the utilization efficiency of the mineralizing agents is low are solved. According to the invention, mineralizer reduction and firing temperature reduction are realized by improving the use efficiency of the mineralizer, and the amorphous phase content in the finished product of the silica brick is obviously reduced on the premise of not reducing the content of phosphorus quartz. The preparation method is simple, the raw materials are rich, the cost performance is excellent, the sintering process is easy to control, the preparation method is suitable for industrial production of large silica bricks, and the finished product bricks are excellent in performance and high in percent of pass.

The invention relates to the technical field of agriculture, in particular to a plant nutrient solution for saline-alkali soil improvement and a preparation method thereof. The invention relates to a preparation method of a plant nutrient solution for improving saline-alkali soil. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides and acid modified calcium-based montmorillonite; preparing humic acid chelated calcium magnesium powder; preparing a binary compound; and preparing the plant nutrient solution. The preparation method comprises the following steps: preparing NO3-intercalated layered double hydroxides from calcium nitrate tetrahydrate and aluminum nitrate nonahydrate, carrying out acid modification on calcium-based montmorillonite by using dilute sulphuric acid, purifying humic acid, and mixing with calcium chloride and magnesium chloride hexahydrate to prepare humic acid chelated calcium magnesium powder. Finally, the three components are added into pig excrement fermentation liquor to prepare a plant nutrient solution, an adsorption-replacement-leaching closed loop can be formed, the desalination and alkali reduction efficiency is remarkably improved, the soil structure is improved, the effect of synergistically improving the saline-alkali soil is achieved, and therefore plant growth is promoted.

The invention discloses a CCTO dielectric ceramic, and belongs to the technical field of dielectric ceramic synthesis. Calcium nitrate tetrahydrate, copper nitrate trihydrate, tetrabutyl titanate and niobium oxalate hydrate are used as raw materials, a precursor solution is prepared according to the molar ratio of calcium to copper to titanium to niobium being 1: 3: 4-x: x, the PH is adjusted, colloid obtained after aging is dried and ground, then high-temperature sintering is conducted in a muffle furnace, tabletting is conducted after the colloid is mixed with an adhesive, annealing is conducted, and finally the high-density, good-uniformity and high-temperature-resistant titanium-titanium alloy is obtained. And the single-doped CaCu3Ti (4-x) NbxO12 ceramic sample has the advantages of low dielectric loss and high dielectric constant.

The invention discloses an HPVC power cable protection pipe and a preparation method thereof, and relates to the technical field of cable protection pipes. The HPVC power cable protection tube is at least prepared from the following raw materials in parts by weight: 100 parts of high-strength polyvinyl chloride, 35 to 45 parts of epoxy acrylate rubber, 5 to 8 parts of vinyl chloride-g-acrylate copolymer, 8 to 12 parts of epoxidized soybean oil, 3 to 5 parts of calcium-zinc composite stabilizer, 5 to 15 parts of modified hydrotalcite, 0.1 to 0.5 part of beta-diketone, 0.8 to 1.5 parts of calcium stearate and 10 to 20 parts of flame retardant. 12 to 15 parts of modified nano calcium carbonate, 5 to 8 parts of talcum powder, 0.6 to 1.2 parts of antioxidant, 1 to 2 parts of anti-aging agent 4010 and 0.5 to 1.5 parts of ultraviolet light absorber UV531; the modified hydrotalcite is obtained by adding a mixed solution of calcium nitrate and lanthanum nitrate, a sodium hydroxide solution and a sodium bicarbonate solution into a lauryl sodium sulfate solution, mixing and aging, and then carrying out a post-treatment process. The HPVC power cable protection tube prepared by the invention has relatively high strength, good mechanical properties, weather resistance and cold resistance, and long service life.

The invention relates to a manganese zinc ferrite composite magnetic catalyst and a preparation method thereof. The preparation method comprises the following steps: adding manganese nitrate, zinc nitrate and ferric nitrate into deionized water to form a metal ion solution; the preparation method comprises the following steps: adding ethylenediaminetetraacetic acid into a metal ion solution to form sol, performing heating dehydration treatment, grinding, and performing heat treatment to obtain manganese zinc ferrite nanoparticles; dissolving calcium nitrate, indium nitrate and thioacetamide in deionized water, then adding the manganese zinc ferrite nanoparticles to obtain a suspension of a reaction mixture, carrying out hydrothermal reaction, and carrying out subsequent extraction treatment to obtain the manganese zinc ferrite composite magnetic catalyst. The composite magnetic catalyst is prepared by utilizing a two-step hydrothermal method, the photocatalytic performance of the composite magnetic catalyst is remarkably improved, and the composite magnetic catalyst can be quickly and completely recycled through magnet adsorption, so that the photocatalytic performance of a single catalyst is improved, and quick recycling and cyclic utilization of the photocatalyst are realized; and the application cost of photocatalysis is reduced.

The invention relates to the technical field of ammonia control and denitrification of kiln flue gas, in particular to an ammonia control and denitrification method for kiln flue gas for preparing cement from carbide slag based on waste heat utilization. According to the technical scheme, the method comprises the following steps that waste heat cooperative utilization is conducted, specifically, flue gas waste heat is subjected to graded utilization through three waste heat recovery systems, specifically, kiln bypass waste heat utilization is conducted, flue gas is extracted from a kiln bypass dechlorination high-temperature area at about 350 DEG C, and the overall energy consumption of the system is reduced; the atomization effect of the calcium nitrate solution is optimized by adopting the nano dispersing agent, and the sulfur resistance of the modified catalyst is combined, so that efficient and stable denitration reaction is realized, ammonia escape is accurately controlled, finally, the flue gas of the kiln can meet the ultralow emission requirement, and secondary pollution to the environment is greatly reduced; the modular reactor design and the dynamic predictive control technology enhance the adaptability of the system to complex working conditions, meanwhile, fuel consumption is further reduced through waste heat recycling and raw flue gas preheating, the service life of equipment is prolonged, and the operation cost of the system is remarkably reduced.

The invention belongs to the technical field of urban water environment treatment and restoration, and discloses a method for improving the micro-ecological environment of bottom mud of an urban black and odorous river. The method specifically comprises the following steps that 1, calcium nitrate with the amount 1.6-1.8 times of theoretical calculation amount is added according to the AVS content in the black and odorous bottom mud to be repaired; 2, after the calcium nitrate reacts, calcium peroxide (CaO2) with the amount 1.3-2.0 times of the theoretical calculation amount is added. According to different reaction processes of AVS and ferrous iron in the black and odorous bottom mud and different oxidation capacities of calcium nitrate and CaO2, calcium nitrate is added firstly, and then CaO2 is added, so that removal of ferrous iron, AVS and organic matters in the black and odorous bottom mud is enhanced, chemical agents are scientifically and efficiently used, and the micro-ecological environment of the black and odorous bottom mud is continuously and effectively improved.

The invention discloses a mineral cemented filling mortar material for mineralizing and sealing CO2 and a preparation method thereof, and relates to the technical field of low-carbon environment-friendly mortar materials, the raw materials comprise carbonic anhydrase-producing microorganisms, aggregate, a calcium source solution and nano zinc oxide; wherein the calcium source solution is an aqueous solution of calcium chloride, calcium nitrate or calcium acetate, the calcium source solution comprises a premixed calcium source solution and a gradient calcium source solution, the concentration of Ca < 2 + > in the premixed calcium source solution is 0.5 mol / L, the concentration of the gradient calcium source solution is 2 mol / L, and the premixed calcium source solution is used after being premixed with the aggregate; the particle size of the nano zinc oxide is 50-100 nm; according to the present invention, the storage amount of carbon dioxide can be increased so as to achieve the requirements of low carbon and carbon reduction, the reaction rate of CO2 hydration to generate HCO3 <-> / CO3 < 2-> can be significantly increased, the generation of HCO3 <-> / CO3 < 2-> can be accelerated, the CO2 hydration reaction and the subsequent gelling effect can be further accelerated, and the environmental protection and low carbon performance can be improved.

The invention discloses an on-site mixed water-gel explosive which comprises the following components in percentage by weight: 45-70% of ammonium nitrate; 9%-15% of water; 10-20% of calcium nitrate; 7-20% of liquid fuel; 0-10% of an auxiliary combustible agent; 0.7%-1.0% of a gelling agent; 0.2%-0.5% of an additive; 0.02%-8% of a sensitizing agent; 1-3% of a cross-linking agent; the density range of the explosive is 0.3-1.25 g / cm < 3 >, and the adjusting range is wide; the detonation velocity of the explosive is 2000-4500 m / s, and the explosive is high in matching degree with medium soft rock; the explosive has good water resistance and is suitable for charging of wet holes, water holes and slurry holes; the production raw materials of the explosive do not contain high-energy materials, and the prepared thickening mother liquor and semi-finished products have the characteristics of good stability, long storage life, high transportation safety and high intrinsic safety.

The invention belongs to the field of cement concrete, and particularly relates to an integrated cementing material special for ultra-high performance concrete and a preparation method of the integrated cementing material. The integrated cementing material comprises fly ash, slag powder, carbide slag, semi-hydrated gypsum, silica fume, a powder reinforcing agent, calcium nitrate and sodium silicate. The production process of the integrated cementing material comprises the following steps: winnowing ultrafine microbeads from fly ash, grinding solid waste powder by a fluidized bed type jet mill, chemically strengthening the powder reinforcing agent, chemically nucleating calcium nitrate and sodium silicate, and mixing the integrated cementing material. The ultra-high performance concrete cementing material is prepared from a high-activity solid waste material, the viscosity of a mixture is reduced by winnowing ultrafine micro-beads, the strength of the cementing material is improved by synergistic reaction of slag powder, carbide slag and semi-hydrated gypsum, and a C-S-H crystal nucleus is formed by chemical reaction of calcium nitrate and sodium silicate to provide active sites, so that the cementing material is prepared. And the cementing material is prepared by combining powder chemical dispersion and integrated mixing, so that the carbon emission and production difficulty of the ultra-high performance concrete are remarkably reduced.

The invention belongs to the technical field of chemical fertilizer preparation, and discloses an efficient water-soluble fertilizer based on polyglutamic acid and a preparation method thereof.The efficient water-soluble fertilizer comprises the following raw materials: polyglutamic acid which is prepared through a microbial fermentation method, has the molecular weight range of 500-1500 kDa and the purity of more than or equal to 95% and serves as a core water and fertilizer retention and nutrient slow release carrier; the high-quality fulvic acid is derived from weathered coal or biochemical extraction, the content of the fulvic acid is greater than or equal to 50%, and the fulvic acid is used for promoting root development and nutrient absorption; the humic acid takes young lignite as a raw material, the content of the humic acid is greater than or equal to 70%, and the humic acid is used for improving the granular structure and microbial activity of soil; the calcium element is added in the form of soluble calcium salt such as calcium nitrate and calcium amino acid chelate, the calcium content is larger than or equal to 10%, and the calcium element is used for enhancing the stability and stress resistance of cell walls of crops in terms of CaO; and the acid-base equilibrium stress-resistant factor comprises a silicon nanowire. The invention provides an efficient water-soluble fertilizer based on polyglutamic acid and a preparation method of the efficient water-soluble fertilizer. The water-soluble fertilizer has higher fertilizer utilization rate, better crop growth promoting effect and stronger stress resistance.

The invention discloses premixed flow-state solidified soil and a preparation method thereof, and the premixed flow-state solidified soil comprises the following components in parts by weight: 100 parts of silty clay; 8 to 15 parts of a curing agent; 48 to 90 parts of water; wherein the curing agent comprises the following components: 10 to 15 parts of sulphoaluminate cement; 40 parts to 55 parts of superfine steel slag powder; 30 to 40 parts of fly ash; 0.5 to 1.5 parts of sodium silicate; 0.1 to 0.3 part of a foaming agent; 0.1 part to 0.2 part of sodium thiocyanate; 0.1 part to 0.2 part of hydroxymethyl cellulose; 0.05 part to 0.2 part of triisopropanolamine; 0.1 part to 0.5 part of calcium nitrate; and 0.5 to 1 part of a polycarboxylic acid water reducing agent. The preparation method of the premixed flow-state solidified soil is suitable for using silty clay as a raw material, and greatly improves the strength, compactness, fluidity and other properties of the premixed flow-state solidified soil.

The invention relates to the technical field of polymer waste treatment, and discloses a composite curing agent for curing chlorine and sulfur in polymer waste microwave thermal conversion and a preparation method and application thereof, and the method comprises the following steps: dissolving calcium nitrate and aluminum nitrate in deionized water to form an active component I solution; dissolving at least one of zinc nitrate, copper nitrate, ferric nitrate, manganese nitrate and cerium nitrate as an active component II in the active component I solution, adding citric acid into the formed mixed solution to form gel, and drying to obtain an active matter; and mixing the active matter, silicon carbide and bentonite, ball-milling, extruding and granulating, and calcining to obtain the composite curing agent. The composite curing agent disclosed by the invention can efficiently recover pyrolytic carbon, pyrolytic oil and pyrolytic gas while effectively and synergistically curing chlorine and sulfur pollution elements in situ; the curing rate of the chlorine / sulfur element can reach 80%, the recovery rate of the composite curing agent can reach 98%, and meanwhile, the raw material cost is low, and the problems of secondary pollution and equipment corrosion are avoided.

The invention discloses a preparation method and a use method of bleeding inhibition microspheres for concrete. The preparation method of the bleeding inhibition microspheres for the concrete comprises the following steps: (1) performing ultrasonic dispersion on alkali-soluble polyester fibers, lauryl sodium sulfate and water to obtain a mixed solution A; (2) dissolving high-modulus sodium silicate in water, adding the steel slag micro powder, and uniformly stirring to form a turbid liquid B; (3) mixing the mixed solution A, the turbid liquid B and sodium alginate to form a mixed solution D; (4) reacting the mixed solution D with an excessive calcium nitrate solution, and filtering to obtain gel microspheres; (5) adding excessive sodium citrate solution into the gel microspheres, dissolving and filtering to obtain particles; and (6) reacting the particulate matters with a sodium hydroxide solution, and filtering to obtain the bleeding inhibition microspheres. When the bleeding inhibition microspheres are added into concrete, bleeding of the concrete can be obviously reduced, the fluidity and cohesiveness of a concrete mixture are improved, and the mechanical property and the volume stability of the concrete are improved.

The present invention provides a composite insecticide containing plant extracts and its preparation process, belonging to the technical field of pesticide preparation; the preparation process includes the following steps: preparing a composite carrier powder; preparing a modified composite carrier powder; preparing a Corydalis extract; preparing a composite insecticide. By first dispersing nano-calcium carbonate powder in deionized water, then adding a mixed solution of calcium nitrate solution and diammonium hydrogen phosphate solution, and carrying out a hydrothermal reaction to prepare a composite carrier powder of nano-calcium carbonate and hydroxyapatite, after loading the Corydalis extract and veratridine with this composite carrier powder, the prepared composite insecticide can have a slow-release effect, extend the insecticidal action time, reduce the number of pesticide applications, and reduce environmental pollution. In addition, after modifying the composite carrier powder, its loading rate for the Corydalis extract and veratridine can be improved, thereby enhancing the insecticidal effect of the composite insecticide.

The invention provides a process for forming alpha high-strength gypsum through crystal transformation of dihydrate gypsum, and relates to the field of building materials, the process comprises the following steps: 1) adding dihydrate gypsum into an acidic aqueous solution, and uniformly stirring to obtain a first mixed solution; 2) adding a composite crystal modifier, calcium nitrate, potassium chloride and deionized water into the first mixed solution, uniformly stirring and fully reacting to obtain a second mixed solution; 3, solid-liquid separation is conducted on the second mixed solution, a solid phase is collected, washed and dried, and the alpha high-strength gypsum is obtained.The hyaluronic acid is subjected to cross-linking modification, so that the modified transparent phytic acid has the larger molecular weight and space structure, the crystal transformation effect of dihydrate gypsum can be remarkably improved after the hyaluronic acid and glutaric acid cooperate, and the yield of the alpha high-strength gypsum is increased.

The invention discloses a colloidal emulsion explosive with high storage stability and a preparation method thereof. The raw materials for preparing the emulsion explosive comprise ammonium nitrate, calcium nitrate, water, a compound emulsifier, compound wax and a special foaming agent. Wherein the composite emulsifier is a modified span-80 composite emulsifier obtained by carrying out esterification reaction on an anionic carboxylate emulsifier and multiple hydroxyl sites of span-80, and the composite emulsifier has high molecular weight, so that the space volume of a lipophilic group is increased, and an interfacial film is tighter; the special foaming agent is composed of sodium nitrite, zinc nitrate, gelatin peptone, Tween 80, phosphoric acid, urea and water, the gelatin peptone is a green pure natural raw material, the surface tension of an emulsion matrix is effectively reduced, the contact area of the foaming agent and the emulsion matrix is increased, the foaming efficiency is catalyzed by zinc nitrate, and bubbles are good in stability and not prone to escaping due to Tween 80. The use of the compound emulsifier and the special foaming agent improves the blasting performance and storage stability of the emulsion explosive.

The invention provides high-transparency rare earth doped fluoride glass and a preparation method thereof, and belongs to the technical field of glass. The calcium fluoride ensures high transparency and chemical stability, the magnesium fluoride improves the ultraviolet transmittance and the mechanical strength, and the barium fluoride optimizes the melting fluidity and the rare earth doping uniformity; aluminum fluoride is added to inhibit crystallization and enhance uniformity, the rare earth element realizes optical function regulation and control, and ammonium fluoride provides a fluorine source and reduces impurities; in a preparation link, quick lime is dedusted and then reacts with pure water in proportion, impurities in a calcium nitrate solution are removed by hydrogen peroxide, uniform growth of calcium carbonate crystal nucleuses is controlled by ammonia water and carbon dioxide, and calcium fluoride is synthesized by hydrofluoric acid in proportion and dried at low temperature after plate-frame pressure filtration and purification; after the raw materials are refined through ball milling, the melting temperature is controlled in stages, impurities, reaction integrity and a microstructure are accurately controlled in the whole process, and finally the high-transparency functional glass is prepared.

The invention provides bridge concrete for extremely cold areas. The bridge concrete is prepared from the following raw materials in parts by weight: 320 to 400 parts of P.O 42.5-grade Portland cement, 9 to 16 parts of a composite anti-freezing agent, 12 to 22 parts of surface modified nano silicon dioxide, 85 to 130 parts of a mineral composite admixture, 950 to 1250 parts of aggregate, 0.7 to 1.6 parts of a polycarboxylic acid type air entraining agent and 1.8 to 5.5 parts of polypropylene fiber, wherein the composite anti-freezing agent is formed by compounding calcium nitrate, calcium formate and triethanolamine according to the ratio of (3.2-5.1): (1.9-4.2): 1, and the effective content of Ca (NO3) 2.4 H2O in the calcium nitrate is greater than or equal to 96%. Compared with the prior art, the composite anti-freezing agent has the following beneficial effects that the calcium nitrate provides early-stage anti-freezing, the calcium formate accelerates low-temperature hydration, and the triethanolamine serves as a dispersing agent to improve the synergistic efficiency of all the components.

The invention relates to the technical field of refractory materials, in particular to a coke oven silica brick and a preparation method thereof.The preparation method comprises the following steps that S1, silica fine powder, calcium nitrate tetrahydrate and high-silicon aluminum alloy powder are mixed to prepare pug 1; s2, pre-sintering the pug 1 at the temperature of 500 to 950 DEG C; s3, uniformly stirring silica aggregate, a binding agent and a material obtained after presintering in the step S2 to prepare pug 2; and S4, pressing the pug 2 into a green brick, and drying and sintering the green brick to obtain the coke oven silica brick. The CaO-Al2O3 mineralizer is used for producing the coke oven silica brick, and the reaction path of the high-silicon aluminum alloy in the brick at high temperature is controlled by a pre-sintering means, so that the heat-conducting property of the silica brick product for the coke oven is improved. The preparation method is simple, the raw materials are rich, the cost performance is excellent, the sintering process is easy to control, the preparation method is suitable for industrial production of large silica bricks, and the finished brick has excellent heat-conducting property.

The highland barley fertilizer is prepared from the following raw materials in parts by weight: 1000 parts of water, 140 to 160 parts of highland barley rice, 0.5 to 1.0 part of zymophyte, 100 parts of amino acid, 100 parts of magnesium sulfate, 10 to 20 parts of borax, 5 to 10 parts of calcium nitrate tetrahydrate and 100 parts of white sugar. The invention relates to the field of compound microbial fertilizers, in particular to a highland barley fertilizer and a preparation method thereof.The liquid fertilizer is prepared with highland barley as the main raw material, the liquid fertilizer is matched with flora capable of releasing soil fertility, the content of amino acid, calcium and magnesium elements in a fermented product is higher than that of a traditional fertilizer, and the content of amino acid, calcium and magnesium elements is increased while the fertility of soil is increased; the hidden fertility of the soil can be released.

The invention belongs to the technical field of resource recycling, and discloses a method for resource utilization of pickling waste liquid and wastewater, which comprises the following steps: firstly, filtering nitric acid and hydrofluoric acid pickling liquid of a titanium material to remove insoluble solids as raw water, and adding an organic complexing agent for complexing fluorine ions; adding CaO into the solution to adjust the pH value, and filtering to obtain filtrate and titanium-rich precipitate; h2O2 / Fe is added into the filtrate for oxidation and complex breaking, then CaO is added to adjust the pH value, and filtrate and fluorine-rich precipitates are obtained after filtering. Putting a composite adsorbent into the filtrate for deep defluorination, performing high-salt reverse osmosis multi-stage concentration on the filtered solution to obtain a 15-18wt% calcium nitrate solution, supplementing nitric acid and ammonia water according to the proportion of calcium ammonium nitrate, and finally evaporating the solution to obtain a solid calcium ammonium nitrate product. And a concentrated solution can be obtained and is directly used for drip irrigation. According to the method, titanium material pickling solution resources can be effectively utilized, and great economic benefits and environmental benefits are achieved.

The invention provides a deodorant for air disinfection and deodorization and a preparation process thereof, and belongs to the technical field of air purification. Comprising the following components: a composite deodorizing material, a composite essential oil microcapsule, a surfactant, benzalkonium bromide and water. The preparation method comprises the following steps: mixing and dissolving calcium nitrate tetrahydrate and diammonium hydrogen phosphate, adding hexadecyl trimethyl ammonium bromide and ammonia water to prepare a mesoporous nano-hydroxyapatite precursor suspension, adding a zinc nitrate solution, and carrying out hydrothermal reaction and calcination to prepare a composite carrier material; when the composite essential oil is loaded into the composite carrier material by using a vacuum impregnation method, the composite essential oil can have a slow release effect, the long-acting deodorization effect of the deodorant is improved, and more adsorption sites can be provided for the composite essential oil, so that the loading rate of the composite carrier material to the composite essential oil can be remarkably improved, and the deodorization effect of the deodorant is improved. The deodorization effect of the deodorant is further improved.

The invention relates to the technical field of saline-alkali soil improvement, in particular to a saline-alkali soil synchronous improvement method based on a low-temperature stable acidic water-soluble fertilizer, which comprises the following steps: step 1, dynamically partitioning a soil profile, excavating the soil profile according to a grid method, and collecting soil samples in layers; 2, in-situ synthesis of a water-soluble fertilizer, wherein ammonium dihydrogen phosphate, citric acid and the hydroxylated humic acid nano colloid react to form an acidic mother solution; coating calcium nitrate with a rosin glyceride-polyvinyl alcohol copolymer to form calcium source microcapsule particles; and compounding the acidic mother liquor, the calcium source microcapsule particles and the phase change regulator to obtain the low-temperature stable final fertilizer. And step 3, performing regional dynamic improvement, spraying a fertilizer solution dominated by an acid mother solution to the rapid salt return region, and burying a conductivity sensor. Through precise soil zoning, synthesis of the low-temperature stable fertilizer and dynamic regulation and control, targeted and efficient soil improvement can be achieved, and the soil quality of a plough layer of the saline-alkali area is remarkably improved.

The invention relates to the technical field of antibacterial materials, in particular to a rare earth antibacterial ultraviolet-proof composite material and a preparation method thereof.The preparation method comprises the following steps that lanthanum oxide is added into a 1-2 mol / L dilute nitric acid solution, heating and stirring are conducted at the temperature of 60-80 DEG C till the lanthanum oxide is completely dissolved, a lanthanum ion solution is obtained, calcium nitrate tetrahydrate and the lanthanum ion solution are added into deionized water, a solution A is prepared, and the solution B is prepared; the preparation method comprises the following steps: adding diammonium hydrogen phosphate and a polymer carrier into deionized water to prepare a solution B, slowly dropwise adding the solution B into the solution A under magnetic stirring to obtain a turbid liquid, adjusting the pH value, stirring for 6-8 hours in an oil bath, standing and aging for 24-36 hours at room temperature, filtering to obtain a precipitate, washing and drying to obtain the rare earth antibacterial ultraviolet-proof composite material. The rare earth antibacterial and ultraviolet-proof composite material prepared by the invention has good antibacterial and ultraviolet shielding properties.

The invention discloses a bottom mud ecological restoration material as well as a preparation method and application thereof. The material is composed of a degradable carrier, a treatment flora and a multifunctional filler. The carrier is porous particles die-cast by corn straws and the like; the treatment flora comprises photosynthetic bacteria, bacillus and nitrifying bacteria; the filler is prepared from non-nitrate type hydrotalcite-like compounds, calcium nitrate, nitrate type hydrotalcite-like compounds and a flocculating agent according to a specific mass ratio. The preparation method comprises the following steps: carrying out pressure casting on the carrier, adsorbing the flora, and rolling the filler to form balls. The restoration method comprises the steps that a river channel is cut off in the dry season to form a closed area, materials are put according to the area ratio of 10: 1 for preliminary restoration, and after standing is conducted for 1-5 days, the materials are put along with water flow according to the area ratio of 2: 1 for deep restoration. Through the physical, chemical and biological synergistic effect, the sediment redox environment can be effectively improved, pollutant release and degradation are promoted, operation is easy and convenient, and the risk of secondary pollution is low.

The invention discloses a flame-retardant wear-resistant conveying belt for a coal mine and a preparation method thereof, and belongs to the technical field of wear-resistant conveying belts. Substances such as calcium nitrate tetrahydrate, ferric nitrate nonahydrate and antimony trioxide are subjected to hydrothermal coprecipitation to obtain multifunctional composite microspheres, the microspheres are aminated through a silane coupling agent KH-550 and then coated with silicon carbide, and coated composite microspheres are obtained; the preparation method comprises the following steps: carrying out graft copolymerization on nitrile rubber, octavinyl silsesquioxane and DOPO acrylate, compounding a quaternary phosphonium salt flame retardant to obtain modified nitrile rubber, carrying out three-stage mixing on the modified nitrile rubber, coated composite microspheres, conductive carbon black and other substances to obtain a rubber coating layer, carrying out double-sided calendering on the rubber coating layer and an epoxy resin plasticized aramid fiber skeleton layer, and carrying out vulcanization molding to obtain the composite material. And finally obtaining the flame-retardant wear-resistant conveying belt for the coal mine. The synergistic effect of high flame retardance, strong wear resistance and static electricity resistance is achieved, and the service life is prolonged.

The invention discloses a cow dung biochar composite material for saline-alkali soil improvement, and a preparation method and application thereof, and belongs to the technical field of cow dung material treatment. The method comprises the following steps: (1) air-drying cow dung, then carrying out oxygen-limited cracking, cooling and crushing to obtain cow dung original biochar; (2) mixing the cow dung original biochar with a calcium nitrate solution, and stirring for modification; and (3) after modification is finished, drying, carrying out oxygen-limited cracking, cooling, and crushing to obtain the cow dung biochar composite material. The calcium nitrate modified cow dung biochar composite material which can be popularized on a large scale and is low in cost is produced through the raw materials wide in source and the method easy to operate, and no pollutant is generated in the preparation process. The prepared composite material can reduce the pH value of saline-alkali soil, improve the physical and chemical properties of soil, has higher adsorption capacity on Na < + > in the soil, reduces the salt content of the soil, increases the nitrate nitrogen content of the soil, promotes plant growth, and meanwhile achieves the effect of recycling livestock waste.

The invention discloses a nickel-calcium-based bifunctional material for a coupling quenching process as well as preparation and application of the nickel-calcium-based bifunctional material. Calcium oxide is used as a carrier, high-temperature calcium oxide is quenched in a mixed aqueous solution containing nickel nitrate, calcium nitrate and citric acid, the prepared nickel-calcium-based bifunctional material has excellent CO2 capture capacity and conversion capacity, a rich pore structure is created for the material through the quenching technology, the strong interaction between metal and the carrier is improved, and the CO2 capture capacity and conversion capacity of the material are improved. The active metal of the material is uniformly dispersed, the material has good CO2 conversion capability and carbon deposition resistance, and efficient integration of CO2 capture and synthesis gas preparation through in-situ methane dry reforming is realized.