120 results about "Calcium nitrate" patented technology

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 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 invention relates to the technical field of fertilizers, in particular to a nutrient polymerized polyglutamic acid compound fertilizer and a preparation method thereof, and the nutrient polymerized polyglutamic acid compound fertilizer comprises the following raw materials in parts by weight: 6-10 parts of gamma-polyglutamic acid, 25-30 parts of filler, 20-25 parts of a nitrogen source, 12-15 parts of a phosphorus source, 10-14 parts of a potassium source, 4-6 parts of a compound additive and 0.1-0.2 part of a fungicide. In the preparation of the granules, the humic acid powder is coated by a first treating agent prepared from the soluble starch, the salicylic acid, the sodium alginate and the like, so that the activity of the humic acid is effectively protected, and meanwhile, the mechanical strength and the slow-release characteristic of the granules are further enhanced by a second treating agent prepared from the components such as the chitosan and the fulvic acid through a chelation cross-linking effect; in addition, chondroitin sulfate, calcium nitrate, ammonium molybdate and molasses in the batch jointly provide medium trace elements and organic carbon sources, and synchronous release and efficient utilization of nutrients after the fertilizer is applied to soil are ensured.

The application discloses a concrete superfine powder admixture early strength type additive and a preparation method thereof. The application adopts the modified silicon dioxide filter sludge prepared from silicon dioxide filter sludge, dilute hydrochloric acid and nano alpha-Fe2O3 precursor, and then mixes the modified silicon dioxide filter sludge with triethanolamine, calcium nitrate, calcium hydroxide and a polycarboxylic acid high-performance water reducing agent to prepare the concrete admixture early strength type additive. After the modification of the nano alpha-Fe2O3 precursor, the surface activity of the silicon oxide compound in the filter sludge is improved, so that the silicon oxide compound can participate in the cement hydration reaction and the early strength is improved. Further, the synthesis of the early strength type calcium silicate increases the diversity of the early strength improvement of the cement, and the early strength agent effect of sodium sulfate existing in the filter sludge is fully utilized. The three early strength effects are combined with each other, and the potential functionality of the filter sludge in producing the early strength effect is fully tapped.

The invention discloses a method for treating aquaculture wastewater based on a persulfate advanced oxidation technology, which comprises the following steps: (1) putting prepared secondary modified zeolite into a polycarboxylate superplasticizer, stirring, then adding a solution containing Fe < 2 + > and / or Fe < 3 + >, carrying out ultrasonic treatment, then separating out a solid product, and calcining in a protective atmosphere to obtain a modified zeolite precursor; and then cooling to room temperature to obtain the three-stage modified zeolite. And (2) adding the mixture into alkali liquor for heating treatment, then mixing the obtained solid product with a calcium nitrate solution for hydrothermal reaction, and then washing and drying the obtained solid product to obtain the heterogeneous catalyst. And (3) adding persulfate and a heterogeneous catalyst into the breeding wastewater for wastewater treatment. Heterogeneous catalysis is adopted to promote persulfate to release free radicals, so that the problem of waste caused by difficulty in recycling a catalyst is solved, and the problem of secondary pollution of wastewater caused by the catalyst is favorably avoided.

The invention discloses a carbon-based biological liquid organic water-soluble fertilizer as well as a preparation method and application thereof, and belongs to the technical field of biological organic fertilizers. The water-soluble fertilizer comprises the following raw materials in parts by weight: 15-25 parts of a seaweed extract, 10-15 parts of potassium fulvate, 5-10 parts of a compound microbial agent, 3-5 parts of potassium dihydrogen phosphate, 2-4 parts of potassium nitrate, 2-3 parts of urea, 2-3 parts of calcium nitrate, 1-2 parts of magnesium sulfate heptahydrate, 1-1.5 parts of a trace element-containing substance, 1-2 parts of sodium dodecyl benzene sulfonate and 0.5-1 part of potassium sorbate. The total amount of the components is 100 parts. According to the invention, three strains such as pseudomonas sevivaldi, bacillus pumila and bacillus thuringiensis are screened to play roles in three dimensions of promoting growth, improving rhizosphere environment and preventing and treating diseases and insect pests respectively, and are combined with organic components such as seaweed extract and potassium fulvate in the fertilizer and other components, so that the fertilizer has a good application prospect. A comprehensive system of nutrition, growth promotion, disease resistance and quality improvement is formed, and the yield and quality of grapes are remarkably improved.

A method for large-scale synthesis of calcium lanthanum sulfide (CLS) powders and the resulting optical-grade materials are disclosed. The CLS powders, including compositions such as CaLa2S4, CaLa2.0-2.7S4.0-5.05, and CaLa18S28, are produced via an aqueous combustion process utilizing lanthanum nitrate, calcium nitrate, and thioacetamide as a sulfur donor. The exothermic combustion step generates localized high temperatures, forming nanostructured CLS powders with uniform stoichiometry and phase purity without the need for prolonged calcination. The powders exhibit excellent sinterability and can be consolidated by hot isostatic pressing into windows, domes, and lenses with infrared transmittance exceeding 50% in the 8-14 μm range and high mechanical strength. The process is scalable, energy-efficient, and environmentally friendly, enabling cost-effective production of infrared optical components for missile and defense applications.

The invention relates to the technical field of aerogel microspheres, and discloses hydroxyapatite aerogel microspheres and a preparation method and application thereof.The method comprises the steps that triethyl phosphite and water are subjected to a first contact reaction, and a mixture I is obtained; the mixture I is sequentially mixed with an anionic surfactant, an ethanol solution containing an inorganic calcium source and an alkaline substance for a reaction, and hydroxyapatite aerogel microspheres are obtained; the adding amount of the alkaline substance is controlled, so that the initial pH value of the reaction system is 8-10; the inorganic calcium source is calcium nitrate and / or calcium hydrogen nitrate, and the molar ratio of the calcium element in the inorganic calcium source to the phosphorus element in the triethyl phosphite is 5: (2-4). The hydroxyapatite aerogel spherical particles are prepared by utilizing an emulsion method, and the prepared aerogel microspheres are high in specific surface area, are more regular and uniform, are low in breakage rate and have the advantage of being easier to industrialize.

The application provides a method for preparing calcium thiocyanate by using desulfurization waste liquid, calcium nitrate and ammonium thiocyanate are respectively dissolved into 30-50% solution, the calcium nitrate solution is slowly dropped into the hot ammonium thiocyanate solution under the conditions of heating and stirring, under the heating state, the double decomposition reaction occurs to generate calcium thiocyanate and ammonium nitrate, with the continuous heating and the evaporation of water, the concentration of calcium thiocyanate gradually increases, the ammonium nitrate is heated and decomposed to generate nitrogen oxide and ammonia gas, the generated process gas rich in nitrogen oxide and ammonia gas is condensed and introduced into the coking ammonia removal and denitration section for treatment, and finally the evaporation and concentration obtain about 50% calcium thiocyanate product. The method uses industrial waste to provide raw materials, and the production cost is low; the process tail gas generated in the reaction only needs to be treated by the existing ammonia removal and denitration device of the coking enterprise, without increasing additional equipment, thereby saving the expenditure; and the method has environmental protection benefit, social benefit and economic benefit.

The application discloses a catalyst for synthesizing methanol, and a preparation method of the catalyst, which comprises the following steps: (1) adding gamma-Al2O3 powder into a salt solution corresponding to an alkaline earth metal, then adding triethanolamine, uniformly mixing, and placing in a muffle furnace for calcination to obtain a pretreated gamma-Al2O3 carrier; (2) firstly, immersing the pretreated gamma-Al2O3 carrier in a calcium nitrate solution, and drying the catalyst precursor after immersion; (3) dissolving copper nitrate, cesium nitrate and ammonium metavanadate in deionized water to obtain a mixed solution, immersing the catalyst precursor obtained in the step (2) in the mixed solution, slowly adding an acid solution to control pH after immersion for a period of time, until precipitation is generated, and then filtering, washing, drying and calcining to obtain the catalyst. The catalyst prepared by the method has high methanol selectivity and can maintain high stability in the case of being exposed to air for a long time.

The invention provides a quality-divided collection zero-emission treatment method and system for solar cell wastewater, and belongs to the technical field of advanced treatment and resource utilization of industrial wastewater. Comprising the following steps: sequentially performing filtration and reverse osmosis concentration on dilute acid wastewater; the fluorine-containing wastewater is sequentially subjected to fluorine removal, filtration and reverse osmosis concentration, and obtained concentrated water is subjected to hardness removal, filtration, ion exchange resin hardness removal, electrodialysis and evaporative crystallization to obtain sodium chloride; sequentially carrying out silicon removal, filtration and reverse osmosis concentration on the dilute alkali wastewater; the concentrated alkali wastewater is sequentially subjected to silicon removal, filtration, catalytic ozonation and reverse osmosis concentration, and the obtained concentrated water is sequentially subjected to refractory organic matter removal, silicon removal, filtration and electrodialysis; sequentially removing sulfate radicals and fluorides from the concentrated acid wastewater, and filtering; the acid-nitrogen wastewater is sequentially subjected to filtration, reverse osmosis concentration, sulfate radical and fluoride removal, hardness removal, filtration and nanofiltration, and nanofiltration fresh water is sequentially subjected to fluorine removal, hardness removal, reverse osmosis concentration and evaporative crystallization to obtain calcium nitrate. The conversion from traditional large-water-volume low-concentration mixed treatment to low-flow high-concentration quality-divided wastewater treatment is realized.

The invention discloses an early-strength grinding aid as well as a preparation method and application thereof, and belongs to the technical field of building materials. Every 100 parts of the early strength grinding aid comprises the following components in parts by weight: 12-18 parts of dual modified nano calcium silicate, 8-12 parts of a citric acid modified alcohol amine compound, 18-22 parts of alkali activated superfine slag powder, 3-6 parts of a dispersing agent, 2-4 parts of a stabilizer and the balance of water, the double modified nano calcium silicate is prepared by reacting sodium silicate with calcium nitrate and performing double modification through polyvinylpyrrolidone and a silane coupling agent; the citric acid modified alcohol amine compound is a citric acid modified alcohol amine compound, and the alcohol amine compound comprises triethanolamine and diethyl isopropanolamine; the alkali activated superfine slag powder is slag powder activated by NaOH. The early-strength grinding aid is low in cost, can effectively improve the 3d strength of mineral powder cement after being doped in the mineral powder cement, and enables the mineral powder cement to be free of shrinkage.

Provided is a separator used for a secondary battery. The separator may comprises a complex-containing layer which is provided on a surface in contact with a negative electrode of the secondary battery and which contains an electrolyte complex. The electrolyte complex may contain a nitrate and a coordination substance. The nitrate may include at least one selected from lithium nitrate, potassium nitrate, cesium nitrate, sodium nitrate, silver nitrate, calcium nitrate, zinc nitrate, copper nitrate, magnesium nitrate, indium nitrate, aluminum nitrate, ammonium nitrate, barium nitrate, and iron nitrate.

The invention provides a water fertilizer for preventing the bending phenomenon of cut-flower roses as well as a preparation method and application of the water fertilizer, and belongs to the technical field of fertilizers. Comprising the following components: potassium nitrate, monopotassium phosphate, calcium nitrate terahydrate, ammonium dihydrogen phosphate, calcium sulfate, magnesium sulfate heptahydrate, chelated zinc, borax, sodium bicarbonate, chelated iron, chelated manganese, chelated copper and sodium molybdate dehydrate. The preparation method of the water fertilizer for preventing the bending phenomenon of the cut-flower roses is simple, quick in effect, low in cost, environment-friendly and safe, and the growth and development process of the cut-flower roses is accurately regulated and controlled by guaranteeing normal water fertilizer supply. The occurrence rate of the bending phenomenon of the cut-flower roses is obviously reduced, the quality of the cut-flower roses is effectively improved, and the quality improvement and efficiency improvement of the industry are promoted.

The invention discloses an environment-friendly metal deactivator and a preparation method thereof, and relates to the field of petrochemical engineering, and the environment-friendly metal deactivator comprises the following raw materials in parts by weight: 10-15 parts of modified nano magnesium oxide, 10-12 parts of citric acid, 20-25 parts of calcium nitrate and 350-450 parts of water. The modified nano magnesium oxide has strong hydrothermal stability, strong affinity with an FCC catalyst, strong capability of passivating heavy metals nickel and vanadium, effective inhibition of FCC catalyst poisoning, and high environmental protection property.

This invention provides a non-fired magnesia-calcium brick and its preparation method, belonging to the field of refractory materials. Its raw materials include aggregates, fine powder, graphite, binders and composite additives, wherein the composite additives contain calcium nitrate tetrahydrate. The non-fired magnesia-calcium brick of this invention has the following beneficial properties: (1) The composite additives are uniformly distributed in a network in the non-fired magnesia-calcium brick. Due to the dehydration reaction of calcium nitrate tetrahydrate in the composite additives during the brick drying process, a uniform network crack is formed in the finished brick, thereby improving the thermal shock resistance of the product; (2) The calcium nitrate formed by the dehydration of calcium nitrate tetrahydrate has strong water absorption, effectively protecting the CaO in the brick from hydration and improving the hydration resistance of the product; (3) During the high-temperature use of the finished non-fired magnesia-calcium brick, the calcium nitrate undergoes melting and decomposition to transform into highly active CaO, and reacts with SiO2 introduced in the composite additives to form a combined phase, improving the medium-temperature performance of the non-fired magnesia-calcium brick.

The present application relates to a kind of low-temperature flue gas desulfurization and denitrification device and method thereof, belong to flue gas processing technical field.The device includes fixed desulfurization bed, gas mixer, fixed denitration bed, fan and diffusion tower connected in turn through flue gas pipeline, also set up flue gas analyzer to assist desulfurization and denitrification.The flue gas is first desulfurized by fixed desulfurization bed, then according to the collection data of first flue gas analyzer, adjust the amount of water vapor and ozone injection through gas mixer, to adjust humidity and oxidize nitrogen oxide;Finally, the flue gas is deeply denitrified by fixed denitration bed.The present application adopts all dry process, solves the problem of low-temperature flue gas denitrification, without spraying system and catalyst, by-product is calcium sulfate and calcium nitrate, which can be resource utilization, investment operation cost is low, no waste water and solid waste generation, high efficiency.

An object of the present invention is to provide a coolant composition for an electric vehicle from which fluoride ions are sufficiently removed.SOLUTION: The present invention relates to a coolant composition for electric vehicle, comprising a fluoride scavenger consisting of calcium carbonate, calcium nitrate, or a mixture thereof, wherein the content of fluoride ions is 80ppm or less, the pH is 6 to 9, and the conductivity is 250 μ S / cm or less.SELECTED DRAWING: None

The invention discloses a fused salt heat storage material based on a lithium nitrate and polyvinylidene fluoride hybridized zeolite imidazate framework structure. The fused salt heat storage material comprises the following components in parts by mass: 20-35 parts of sodium nitrate, 25-40 parts of potassium nitrate, 10-20 parts of lithium nitrate, 10-25 parts of calcium nitrate and 0.5-2 parts of a polyvinylidene fluoride hybridized zeolite imidazate framework structure material, the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material is prepared by the following steps: step 1, adding a zinc nitrate solution into a 2-methylimidazole solution under a stirring condition, standing, carrying out a crystallization reaction, washing and drying to obtain a zeolite imidazate skeleton structure material; and step 2, mixing the zeolite imidazate skeleton structure material, polyvinylidene fluoride and dimethylformamide, and drying to obtain the polyvinylidene fluoride hybridized zeolite imidazate skeleton structure material. The fused salt heat storage material is high in specific heat capacity and low in viscosity.

The invention provides an elasticity reducer for sprayed concrete and a preparation method thereof, and relates to the field of road construction materials. Comprising the following steps: S1, selecting an aluminum source, sodium hydroxide and deionized water, and mixing and reacting to obtain an active aluminum-containing component; s2, kerosene and span-80 are selected as oil phases, calcium nitrate, alkaline silica sol and deionized water are selected as water phases, CO2 is continuously introduced, and an excitation component is obtained after a mixed reaction; s3, 20-50 parts of an excitation component, 100-300 parts of an active aluminum-containing component, 600-820 parts of a condensation adjusting component, 5-10 parts of a pH adjusting component and 20-50 parts of a state adjusting component are selected, mixed and ground for 30-80 min, and the elasticity reducing agent for sprayed concrete is obtained. By adding the active aluminum-containing component, the excitation component, the coagulation adjusting component, the pH adjusting component and the state adjusting component, the prepared elasticity reducer for the sprayed concrete can shorten the coagulation time of the sprayed concrete, can reduce the resilience of the sprayed concrete, can generate a large amount of AFt, and promotes the improvement of the early strength of the sprayed concrete.

The application belongs to the technical field of fertilizers, and particularly relates to a medium-element liquid fertilizer and a preparation method thereof. The medium-element liquid fertilizer comprises 52.5wt%-53.5wt% calcium nitrate tetrahydrate, 4.44wt%-4.56wt% medium-element nitrate, 0.09wt%-0.11wt% manganese nitrate solution with a concentration of 50wt%, 5.95wt%-6.05wt% first chelating agent, 1.45wt%-1.55wt% second chelating agent, 0.39wt%-0.41wt% compound amino acid, 0.49wt%-0.51wt% boric acid, 0.39wt%-0.41wt% first active substance, 0.29wt%-0.31wt% second active substance, 0.29wt%-0.31wt% alginic acid, and the balance of water. The mass ratio of the first active substance to the second active substance is 4:3. The first active substance is diethylaminoethanol succinate citrate, and the second active substance is fatty alcohol citric acid monoester dipotassium salt. The preparation method adopts a sugar alcohol and citric acid monohydrate mild room temperature double-chelating process, so that the fertilizer has both quick-acting and sustained-acting properties. The medium-low temperature chelating process has high chelating degree and good fertilizer mixing property.

The application discloses a kind of magnetic biochar based on solid waste and its preparation method and application, preparation method is to red mud excessive nitric acid is fully reacted after solid-liquid separation, obtain the mixed solution containing iron nitrate, aluminum nitrate and calcium nitrate and SiO2 Solid product;Broken straw particle is added to mixed solution and is fully stirred and mixed, impregnation;Appropriate alumina is added to mixed solution, and the Fe / Al ratio in mixed solution is adjusted to (1~2):1;Straw after impregnation is washed and dried, and is fully mixed with calcium-rich compound after high-temperature pyrolysis treatment in anoxic environment, after cooling, grinding and screening, magnetic biochar is obtained.The raw materials required for the preparation of the material are mainly derived from industrial and agricultural solid waste, and the preparation cost is low, which can effectively realize the resource utilization of industrial and agricultural solid waste.The material has excellent adsorption performance for trace elements such as phosphorus, cadmium and arsenic, and can separate and remove pollutants from the medium by magnetic separation.