282 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 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 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 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 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 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 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 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 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 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 relates to a method for improving the crystal granularity of calcium nitrate tetrahydrate, and belongs to the technical field of calcium nitrate tetrahydrate crystallization. The invention mainly solves the technical problems of long crystallization time, difficulty in control of the crystallization process, wall hanging of a crystallization tank, non-uniform crystallization granularity and difficulty in drying of crystallized products in the crystallization process of calcium nitrate tetrahydrate at the present stage. According to the technical scheme, the method for improving the crystal granularity of calcium nitrate tetrahydrate comprises the following steps: 1) preparing a reaction solution, namely reacting nitric acid with calcium carbonate, slowly adjusting the pH value, and filtering to obtain the reaction solution; 2) preparing a concentrated solution: performing high-temperature evaporation concentration on the reaction solution in the step 1); (3) carrying out primary cooling on the concentrated solution, namely pumping the concentrated solution in the step (2) into a buffer tank, and pumping the concentrated solution into a crystallizing tank after the concentrated solution is cooled to the material temperature of 60 DEG C; and 4) secondary cooling crystallization: when the temperature of the concentrated solution in the crystallizing tank reaches 38-40 DEG C, adding a small amount of seed crystals (not easy to add more) so as to achieve a seeding effect, and after the temperature of the material liquid in the crystallizing tank reaches 30-37 DEG C, carrying out solid-liquid separation by a centrifugal machine. The method has the advantages of simplicity in operation, short cooling time, large and uniform crystal granularity and the like.

The present disclosure provides a method for producing calcium nitrate from calcium lactate. The method comprises: a) providing an aqueous calcium lactate solution; b) adding phosphoric acid to the aqueous calcium lactate solution, thereby producing a first composition comprising lactic acid and calcium phosphate; c) separating the calcium phosphate from the first composition, thereby obtaining an aqueous lactic acid solution and a second solid composition comprising calcium phosphate; d) reacting the second solid composition with nitric acid, thereby obtaining a third composition comprising phosphoric acid and calcium nitrate; and e) separating the calcium nitrate from the third composition, thereby obtaining an aqueous phosphoric acid solution and a solid calcium nitrate composition.

The invention discloses a calcium nitrate slow-release filler for strengthening restoration of black and odorous bottom mud of a river channel and a preparation method of the calcium nitrate slow-release filler. The calcium nitrate slow-release filler is prepared by physically mixing Ca (NO3) 2.4 H2O, PVA (Polyvinyl Alcohol) and sodium carboxymethyl cellulose. The calcium nitrate slow-release filler disclosed by the invention not only can controllably slowly release calcium nitrate and prevent the calcium nitrate from quickly escaping to overlying water to cause secondary pollution after being put into the bottom mud, but also can provide an electron acceptor for the bottom mud, effectively remove sulfide and ferrous ions in the black and odorous bottom mud and relieve the black and odorous phenomenon of the bottom mud in urban river channels; the method has a wide application prospect in the restoration of the black and odorous bottom mud of the river channel.

The invention discloses a composite thermal insulation material suitable for A-grade fire prevention and a preparation method thereof, relates to the technical field of building composite materials, and solves the problem that an existing building material is difficult to meet the comprehensive requirements of fire prevention, thermal insulation and freezing resistance in alpine regions. Comprising quick-hardening sulphoaluminate cement, silica powder, MDI-50, polyether polyol, silane coupling agent modified basalt fibers, silane coupling agent modified polyvinyl alcohol fibers, triethanolamine, a thickening foam stabilizer, fatty alcohol ether sodium sulfate and 1-1.5 parts of a calcium nitrite antifreezing agent. The thickening foam stabilizer is a compound of hydroxypropyl methyl cellulose and polyether modified silicone oil. The material can be prepared without special construction equipment, can be accurately adapted to construction scenes of traffic inconvenience and energy shortage in alpine regions, and has extremely high engineering application value and popularization prospect.

The application provides an in-situ liquid gel-forming water-retaining agent and a preparation method and application thereof. The water-retaining agent is composed of A component and B component which are applied in steps. The A component contains an aqueous solution of a natural modified polymer, and the natural modified polymer is selected from one or two of carboxymethyl chitosan, carboxymethyl cellulose or a sodium salt thereof. The B component contains an aqueous solution of a cationic crosslinking agent, and the cationic crosslinking agent is selected from one or more cations of copper nitrate, iron nitrate, zinc nitrate, manganese nitrate, chitosan quaternary ammonium salt, calcium nitrate and magnesium nitrate. The water-retaining agent can realize the integrated functions of slow release of trace elements, water retention, soil improvement and precise nutrition supply. Furthermore, the water-retaining agent is applied to crop growth in combination with the "step-by-step drip irrigation and in-situ gel formation" technology, so that the agronomic characters of crops can be significantly improved.

The invention discloses a method for comprehensively recycling yellow phosphorus slag of an electric furnace, and belongs to the technical field of chemical engineering. Comprising the following steps: grinding slag, adding nitric acid in proportion, reacting dicalcium silicate in the slag with nitric acid to generate calcium nitrate and silicon slag, and reacting calcium nitrate with ammonium carbonate to prepare an ammonium nitrate product and a calcium carbonate product; and washing and separating the silicon slag to obtain orthosilicic acid, returning one part of orthosilicic acid to be re-blended with the phosphate ore to enter the furnace so as to recycle the slag, and calcining the rest part of orthosilicic acid to obtain a white carbon black product. The use amount of silica is reduced, mineral resources of silica are saved, and the use amount of silica produced from yellow phosphorus reaches self-balance.

The invention relates to the technical field of metal surface treatment, in particular to a high-salt-spray-corrosion-resistance workpiece surface phosphating treatment method. The method comprises the following working procedures of ultrasonic oil removal, water washing, water washing, activation, dipping phosphorization, water washing, water washing, ultrasonic hot water washing and drying, and dipping phosphorization refers to that an activated workpiece is put into a phosphating solution to be subjected to phosphating treatment; the phosphating solution comprises the following components: 5-8 g / L of organic phosphonic acid, 30-40 g / L of zinc dihydrogen phosphate, 50-55 g / L of calcium nitrate, 2-4 g / L of sodium m-nitrobenzenesulfonate, 1-2 g / L of an accelerant, 0.5-0.8 g / L of a surfactant, 1-3 g / L of sodium molybdate, 2-4 g / L of citric acid and 0.2-0.44 g / L of rare earth salt. Through low-temperature high-efficiency process design and multi-component collaborative innovation, breakthrough is achieved in the aspects of compactness, corrosion resistance, adhesive force and other core performance of the phosphating film, the environment friendliness and economical efficiency are both achieved, and a new solution is provided for metal corrosion prevention in the fields of automobiles, ships, electronics and the like.

This application relates to the field of wastewater treatment, specifically disclosing a sulfur autotrophic denitrification process; including the following specific steps: S1: After adjusting the pH of calcium nitrate tetrahydrate solution and ammonium dihydrogen phosphate solution to alkaline, triethanolamine is added dropwise to the calcium nitrate solution, followed by the addition of ammonium dihydrogen phosphate solution to form a reaction solution. The pH of the reaction solution is maintained at alkaline, and the reaction is heated. After filtration, washing, and drying, hydroxyapatite powder is obtained. The hydroxyapatite powder is mixed with a foaming agent, foam stabilizer, and adhesive, pressed into shape, and sintered to obtain a porous ceramic carrier; S2: The porous ceramic carrier, ground inorganic energy material, and denitrifying bacteria are added to the wastewater to be treated, mixed, and subjected to aeration treatment. The inorganic energy material is replenished periodically to complete the process. The sulfur autotrophic denitrification process used in this application has high denitrification efficiency, and no replenishment of denitrifying bacteria is required during the process.

The invention discloses fibrous ettringite, a light cement aerogel material for a pipeline lining based on the fibrous ettringite and a preparation method of the light cement aerogel material. The light cement aerogel material for the pipeline lining is prepared from a solution obtained by mixing and stirring fibrous ettringite, cement, an adhesive, a dispersing agent, a hydrophobic component, a foaming component and water through a directional freezing technology, wherein the fibrous ettringite is prepared by heating and stirring a calcium nitrate solution, an aluminum sulfate solution and a sodium hydroxide solution. According to the invention, ettringite which can be uniformly dispersed is synthesized by a ligand-free thermal injection method, and the ettringite, cement and an adhesive raw material are subjected to freezing pore-forming by adopting a directional freezing technology, so that the aerogel material with a special organic-inorganic framework directional ordered pore structure has the characteristics of light weight, high strength, flame retardance and the like; and the overall performance of the pipeline lining material can be improved.

The present invention discloses a method for preparing ultrafine particles of low-dielectric ceramic materials for 6G, relates to the technical field of dielectric ceramic materials, and belongs to patent classification number C04B35 / 00. The specific preparation method is to first prepare a sol using tetraethyl orthosilicate, calcium nitrate, magnesium nitrate, aluminum isopropylate, zirconium oxychloride and lithium nitrate, heat the sol and let it stand for gelation, then use supercritical CO2 to dry, obtain aerogel, heat and reduce calcination to obtain (Ca, Mg) SiO3-ZrO2 nanopowder, and use atomic layer deposition technology to coat a TiO2 layer on the surface of the nanopowder to obtain ultrafine particles of dielectric ceramic materials. The ceramic particles prepared by the present invention not only have a low dielectric constant, but also have a smaller particle size and a higher density under low-temperature sintering.

The present application relates to a method for purifying a lithium leaching solution from aluminum electrolysis waste, belonging to the field of purification and refinement of lithium-containing leaching solutions in the process of extracting lithium from aluminum electrolysis waste. The technical problem to be solved by the present application is that in the prior art, the lithium loss rate is high and the lithium carbonate recovery rate is low during the purification process of the lithium leaching solution from aluminum electrolysis waste. The technical solution provided by the present application is as follows: After adding a stabilizer calcium nitrate / calcium chloride to the leaching solution, an alkaline substance is added to adjust the pH value of the solution to 8.0 - 9.0, and then the reaction is continued. After solid-liquid separation, solution A and filter residue A are obtained. Subsequently, sodium carbonate is added to solution A for reaction. After the purification process, the concentrations of calcium ions and fluoride ions in the leaching solution are lower than 10 mg / L, and the concentrations of magnesium ions, iron ions, aluminum ions, boron ions, silicon ions, manganese ions, nickel ions, copper ions, etc. are close to or equal to zero. The lithium ions are basically not lost. The overall disposal process is short, there is no requirement for the original leaching solution, the lithium loss rate is low, and the impurity removal effect is good and the efficiency is high.

The invention relates to the technical field of chemical production, and provides a gypsum-based inorganic cementing material and a preparation method and application thereof.The gypsum-based inorganic cementing material is prepared from, by mass, 30%-50% of anhydrous gypsum, 20%-30% of semi-hydrated gypsum, 5%-10% of quick lime and 5%-30% of aluminum sulfate or alums, and the sum of the mass percentages of all the components is 100%. Calcium formate or calcium nitrate accounts for 5-10%, copperas accounts for 0-10%, and sodium metaaluminate accounts for 0-10%. According to the gypsum-based inorganic cementing material as well as the preparation method and the application thereof provided by the technical scheme, the core technical bottleneck of environmental problems caused by massive stockpiling of industrial byproduct gypsum and poor water resistance of products is effectively solved, and high-added-value resource utilization of the industrial byproduct gypsum is realized.