202 results about "Magnesium phosphate" patented technology

The invention discloses a water and fertilizer management method for transplanted high-yield indica type two-line hybrid rice, and belongs to the technical field of rice cultivation. Comprising the following steps: (1) applying citric acid chelated calcium magnesium phosphate fertilizer to soil before transplanting; (2) applying coated controlled-release urea and a silicon-zinc fertilizer on the third day after transplanting; (3) when the tiller number reaches 2650,000-2750,000 plants / hm < 2 >, starting intermittent light field drying for three times, and deeply applying potassium magnesium sulphate before field drying; (4) laterally and deeply applying urea and a boron-humic acid chelate when tips of two inverted leaves are exposed; (5) spraying an aqueous solution in a full heading stage, wherein the aqueous solution comprises monopotassium phosphate, chelated zinc and brassinolide. Through staged precise fertilization, special chelating / controlled release fertilizer and water and fertilizer-field drying cooperation, the method has the advantages that the fertilizer utilization rate is increased, the nutritional requirements of rice in each growth period are precisely matched, and water and fertilizer cooperative management is optimized.

The invention belongs to the technical field of soil curing materials, and relates to a salinized soil curing agent and a preparation method thereof. The composite material comprises the following components in parts by mass: 20-40 parts of a bio-based polymer cementing material; 10 to 20 parts of modified bentonite; 15 to 30 parts of superfine slag powder; 1 to 5 parts of nano silicon dioxide; 5 to 15 parts of magnesium phosphate cement; 3-8 parts of a plant fiber reinforced material; 0.5 to 2 parts of a dispersant; and 2-6 parts of a composite slow-release salt-resistant additive. The problems that a traditional curing agent is weak in salt corrosion resistance and poor in durability in salinized soil are solved, the mechanical property and long-term stability of cured soil are remarkably improved, and the environment-friendly, efficient and high-adaptability salinized soil reinforcing effect is achieved.

The invention relates to the technical field of building materials, in particular to light water-resistant phosphogypsum-based cement concrete mortar and a preparation process thereof. The phosphogypsum-based cement concrete mortar comprises the following components: activated phosphogypsum, sulphoaluminate cement, magnesium phosphate cement, modified zeolite powder, lightweight aggregate, modified nano silicon dioxide, a core-shell toughening agent, a polycarboxylate superplasticizer and water, and the preparation method comprises the following steps: respectively preparing the activated phosphogypsum, the modified zeolite powder, the modified nano silicon dioxide and the core-shell toughening agent; the water resistance of the ardealite is improved through activating treatment, the interface bonding force and the structural compactness are enhanced through multi-component synergism by means of selective adsorption of the modified zeolite powder, the mechanical property of the lightweight aggregate is optimized, the toughness is improved through the core-shell toughening agent, and lightweight, high water resistance, stable performance and durability improvement of the mortar are achieved; the requirements of complex building scenes are met, and environment-friendly and practical values are achieved.

The invention discloses a high-reflection magnesium phosphate / aluminum phosphate radiation refrigeration material and a preparation method thereof, and relates to the technical field of radiation refrigeration materials. The preparation method of the high-reflection magnesium phosphate / aluminum phosphate radiation refrigeration material comprises the following steps: (1) mixing aluminum sec-butoxide and deionized water to prepare a solution A; mgCl2. 6H2O and deionized water are mixed to prepare a solution B; mixing the solution A and the solution B to obtain a solution C; (2) adding 3-sulfopropyl tetradecyl dimethyl betaine into the solution C to obtain a solution D; (3) stirring sodium pyrophosphate and deionized water into a solution E; mixing the solution E and the solution D to obtain a solution F; and (4) reacting the solution F at 150-180 DEG C, cooling, freeze-drying and grinding to obtain H, heating H to 300-400 DEG C at the rate of 3-4 DEG C / min, then heating H to 800-1300 DEG C at the rate of 7-10 DEG C / min, and keeping the temperature for 1-3 hours to obtain the product. The material prepared by the invention has excellent sunlight reflectivity and excellent mid-infrared emissivity, and shows excellent performance in the field of radiation refrigeration.

The invention discloses a lithium slag based salt corrosion resistant concrete pole and a preparation method thereof. The pole is made of lithium slag based geopolymer concrete. The concrete comprises the following components in parts by mass: 20-30 parts of dealkalized red mud, 15-25 parts of activated lithium slag, 10-15 parts of slag, 5-8 parts of silica fume, 6-10 parts of magnesium phosphate cement, 12-18 parts of a composite alkali activator, 25-35 parts of machine-made sand, 40-50 parts of gravel, 0.4-0.6 part of a polycarboxylic acid water reducer, 0.8-1.2 parts of composite fibers, 2-3 parts of a salt corrosion-resistant corrosion inhibitor and 25-35 parts of water. The outer surface of the electric pole is coated with an organic silicon-fluorosilicone resin hydrophobic coating; the salt-corrosion-resistant corrosion inhibitor is prepared by compounding nano silicon dioxide, a hydrotalcite precursor and a triphosphonic acid-based corrosion inhibitor, the concrete pole is obtained through the processes of red mud and lithium slag pretreatment, raw material mixing, centrifugal forming, curing and surface treatment, and has excellent salt corrosion resistance and mechanical property.

According to the low-temperature high-durability magnesium phosphate cement and the preparation method thereof, dead burned magnesia powder serves as a core gelling base material and can provide a large amount of active Mg < 2 + >, ammonium dihydrogen phosphate can provide an acid environment and PO4 < 3->, the dead burned magnesia powder and the ammonium dihydrogen phosphate are subjected to an acid-base neutralization reaction in the presence of water to generate ammonium magnesium phosphate hydration products, and the magnesium phosphate hydration products are subjected to a low-temperature high-durability magnesium phosphate cement. The products are interwoven to form a hardened body framework, and a strength foundation is laid for cement; borax is adopted as a key retarder, borate ions generated after the borax is dissolved in water can be adsorbed on the surfaces of dead burned magnesia powder particles, a magnesium borate complex film is formed, the dissolution of Mg < 2 + > and the reaction of PO4 < 3-> are hindered, the cement setting time is effectively delayed, and the construction requirements are met; and the borax can also refine the crystal structure of a hydration product, reduce the porosity, improve the impermeability and the volume stability of a hardened body, and avoid shrinkage cracking.

The application discloses a magnesium phosphate-based cement grouting material and a preparation method and application thereof. The raw materials of the magnesium phosphate-based cement grouting material include A component and B component; the raw materials of the A component include, in parts by weight, calcined magnesium oxide 140-200 parts, bentonite 0-30 parts, hydroxypropyl methylcellulose 0.2-0.5 parts, an additive 1-10 parts and water 70-140 parts; the raw materials of the B component include a first dihydrogen phosphate 70-100 parts, pretreated high-molecular water-absorbing resin 20-50 parts, sodium polyacrylate 0.5-2 parts and water 30-70 parts; the pretreated high-molecular water-absorbing resin is obtained by soaking the high-molecular water-absorbing resin in an aqueous solution of a second dihydrogen phosphate. The magnesium phosphate-based cement grouting material has the characteristics of low shrinkage, short and adjustable setting time, high compressive strength, simple construction, low cost, green environmental protection, good grout injection, good water dispersion resistance, good durability in a long-term soaking environment and the like.

The invention relates to the technical field of microbial fertilizers, in particular to a low-cost compound microbial fertilizer and a preparation method thereof. The low-cost compound microbial fertilizer comprises the following raw materials in parts by mass: 20-40 parts of a fermented organic fertilizer, 10-20 parts of urea, 5-10 parts of ammonium magnesium phosphate, 5-15 parts of a potassium fertilizer, 1-4 parts of sodium humate, 1-4 parts of trehalose, 1-3 parts of gelatin, 0.1-1 part of a stabilizer, 7-19 parts of a mineralized microbial agent load and 1-3 parts of a coating solution, the mineralized microbial inoculum load comprises the following raw materials: 5-15 parts of bamboo charcoal powder, 1-3 parts of a composite microbial inoculum, 1-2 parts of calcium chloride and 1-2 parts of disodium hydrogen phosphate. The fertilizer has the advantages of obviously increasing the fertilizer utilization rate, improving the physical and chemical properties of soil, promoting the formation of granular structures and repairing hardened and ill-conditioned soil, has obvious soil repairing effect and obvious yield increasing, value increasing and quality improving effects, and is suggested to be suitable for large-scale popularization and application when being popularized and applied in production.

The invention discloses a nano-modified fiber reinforced 3D printing magnesium phosphate cement-based material as well as a preparation method and application thereof. The material is prepared from the following components in parts by weight: 40 to 70 parts of dead burned magnesium oxide, 10 to 25 parts of basic hydrogen phosphate, 5 to 25 parts of silica fume, 30 to 60 parts of fine aggregate, 10 to 30 parts of water, 0.1 to 1 part of fiber dispersing agent and 0.5 to 5 parts of nano modified fiber, the surface activity of the fiber is remarkably improved through a nano modification process, active SiO2 sites attached to the surface of the fiber are activated by using an alkali solution, and a hydration product is generated in situ, so that the interface bonding strength between the fiber and a cement matrix is enhanced, and the surface strength of the fiber is improved by relying on the high-rigidity characteristic of the fiber. The yield stress, thixotropic property and constructability of the material are effectively improved, structural deformation in the printing process is remarkably inhibited, and the 3D printing material has excellent rheological property, strengthened mechanical property and tough fiber-matrix interface bonding property.

The invention discloses a method for recovering valuable elements in phosphorite step by step through gradient acid leaching, which comprises the following steps: firstly, mixing high-magnesium phosphorite and high-silicon phosphorite in proportion for ore blending, and carrying out crushing, grading and ball milling until the particle size is less than or equal to 200 meshes; then, adopting a gradient acid leaching process: (1) leaching with low-concentration inorganic acid (1-3wt%), and preferentially and selectively removing dolomite and calcite to obtain phosphate concentrate and leachate rich in calcium and magnesium; (2) leaching the phosphate concentrate by using medium-concentration inorganic acid (5-8wt%), and dissolving the phosphate concentrate to obtain a phosphate concentrate leachate and residues mainly containing iron, aluminum and silicon; and (3) leaching the residues by using high-concentration inorganic acid (30-40wt%) to obtain silicon-rich residues and a leaching solution rich in iron and aluminum. (4) neutralizing and carbonizing the calcium-magnesium leaching solution, and respectively precipitating and recovering magnesium hydroxide and calcium carbonate; (5) carrying out fractional precipitation on the phosphate concentrate leachate to obtain rare earth enrichment and calcium hydrogen phosphate; (6) carrying out alkali dissolution and carbonization reaction on the silicon-rich slag to prepare high-purity white carbon black; and (7) carrying out iron powder reduction, neutralization aluminum removal and oxidation iron precipitation on the iron and aluminum lixivium to prepare the battery-grade iron phosphate. The method is simple and convenient to operate, energy-saving and environment-friendly, various valuable elements in the phosphorite are efficiently recycled, and the economic added value of phosphorite resources is increased.

The application discloses a magnesium phosphate cement-based concrete mechanical property detection equipment and relates to the technical field of magnesium phosphate cement-based concrete mechanical property detection equipment.The magnesium phosphate cement-based concrete mechanical property detection equipment comprises a workbench, a support is fixed to the top of the workbench, a driving motor is fixed to the top of the support, a threaded rod is fixed to the output end of the driving motor, and the bottom of the threaded rod is rotatably installed at the top of the workbench.The magnesium phosphate cement-based concrete mechanical property detection equipment is provided with a protection device.When the pressing block moves downward, the roller extrudes the concrete block and the placing plate to move downward, so that the connecting column drives the extrusion block to move downward, and through cooperation of the rotating block and the rotating rod, the protection plate can be turned over, the protection plate can shield the front face of the placing box, and the safety risk of workers caused by flying stones when the concrete block is crushed is avoided.

The invention relates to the technical field of building materials, in particular to an energy-saving and environment-friendly recycled concrete pipe pile and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by weight: 35 to 45 parts of recycled aggregate, 22 to 28 parts of P.O42.5 Portland cement, 6 to 9 parts of magnesium phosphate cement composite admixture, 18 to 22 parts of river sand, 1.0 to 1.3 parts of hydroxylated graphene-chitosan-nano zinc oxide ternary composite modifier, 6 to 8 parts of modified waste tire rubber powder, 0.5 to 0.8 part of basalt fiber and the like. The rubber powder is soaked in a sodium hydroxide solution and then treated with a maleic anhydride grafted polyethylene solution; the metakaolin is prepared by calcining coal gangue; the ternary modifier is prepared by grafting, crosslinking and dispersing; the magnesium phosphate admixture contains light calcined magnesia, ammonium dihydrogen phosphate and borax. The tubular pile is excellent in mechanical and durable performance and high in solid waste utilization rate, carbon emission and production energy consumption are reduced, the cost is reduced, the problems that a traditional regenerated tubular pile is low in strength and poor in environmental protection performance are solved, the tubular pile is suitable for multiple engineering scenes, and economic and environmental benefits are remarkable.

The invention discloses a well cementation cement slurry system suitable for a high-CO2-content acidic oil and gas field and a preparation method of the well cementation cement slurry system, and relates to the technical field of well cementation materials for oil and gas field development. The well cementation cement slurry system comprises the following components in percentage by weight: 56-75 wt% of G-grade oil well cement, 15-25 wt% of a hydration-corrosion-resistant reinforcing material, 5-8 wt% of a composite corrosion-resistant admixture, 3-5 wt% of an anti-cracking tough material, 0.5-1 wt% of a dispersing agent, 1-3 wt% of a fluid loss agent and 0.5-2 wt% of a retarder, the hydration-corrosion-resistant reinforcing material is formed by mixing micro-silicon, red mud and a nano magnesium phosphate gelling agent according to the mass ratio of 8: 12: 1. The invention also discloses a preparation method of the well cementation cement slurry system. The well cementation cement slurry system has the characteristics of high toughness, high compressive strength, low permeability, good engineering performance, excellent corrosion resistance and the like.

The present application relates to thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material, preparation method and thin film magnesium battery, belong to magnesium battery technical field. Including: magnesium salt powder is mixed with diaphosphorus pentoxide and zirconium oxide powder to obtain mixed powder; the mixed powder is put into a closed ball mill tank and mixed with zirconium oxide balls, then a dispersing agent is added and mixed and ball milled; then a binder is added to the ball mill tank and ball milled; the synthesized powder after ball milling is sieved through a 500 mesh sieve, the sieved synthesized powder is poured into a vibrating mold, pressed, and a die pressed blank is formed; the blank is put into a cold isostatic pressing machine and pressed and pressure maintained, to obtain a zirconium magnesium phosphate solid electrolyte target material blank after cold isostatic pressing; the zirconium magnesium phosphate solid electrolyte target material blank is put into an atmosphere sintering furnace or a vacuum sintering furnace, after multi-stage heat preservation, the furnace is naturally cooled to room temperature, to obtain a thin film magnesium battery zirconium magnesium phosphate solid electrolyte target material. The composition of the solid electrolyte target material of the present application is uniform, facilitating thin film deposition.

This invention belongs to the field of building repair materials technology and provides a water-resistant and freeze-resistant magnesium phosphate cement repair mortar and its preparation method. The raw materials of the water-resistant and freeze-resistant magnesium phosphate cement repair mortar include: modified magnesium oxide, potassium dihydrogen phosphate, admixture, retarder, fine aggregate, water-reducing agent and water. The preparation method includes: (1) dry mixing: the modified magnesium oxide, potassium dihydrogen phosphate, admixture, fine aggregate and retarder are dry mixed to obtain a dry material system; (2) wet mixing and molding: half the mass of water is added to the dry material system, and after stirring, the remaining mass of water and water-reducing agent are added, and stirring is continued to obtain the water-resistant and freeze-resistant magnesium phosphate cement repair mortar. The repair mortar has excellent water resistance, freeze resistance and mechanical properties. The preparation method has a simplified preparation process, low production cost, and can realize the high-value utilization of solid waste, meeting the needs of rapid repair of building projects in harsh environments such as dampness and cold.

The invention discloses a composite polyaluminum ferric chloride water purifying agent and a preparation method and application thereof, and belongs to the technical field of sewage treatment.The preparation method comprises the steps that citric acid modified nano magnesium phosphate is prepared through a hydrothermal reaction, then polyaluminum ferric chloride sulfate powder is prepared through alkalization polymerization, then acidified attapulgite serves as a carrier to load polyaluminum ferric chloride sulfate, and the composite polyaluminum ferric chloride water purifying agent is prepared. Finally, the composite material and citric acid modified nano magnesium phosphate are compounded, aged and dried, and the water purifying agent is prepared. A stable composite structure is constructed through multi-stage assembly, suspended solids, phosphorus, COD and heavy metal ions can be synchronously and efficiently removed through the synergistic effect of electric neutralization, a carrier framework and deep chelation, formed floc is compact and stable and high in impact resistance, the problems that a traditional water purifying agent is single in function, and the synergistic effect is prone to attenuation are fundamentally solved, and the water purifying agent is suitable for large-scale popularization and application. The water treatment scene with harsh requirements on the stability, the reliability and the long-term efficiency consistency of the medicament can be met.

This invention relates to a microbial mineralization composite material for inkjet 3D printing and its preparation method. The composite material comprises powder materials and a binder. The powder materials, by weight, include: 70-85 parts magnesium phosphate cement powder, 10-25 parts fine aggregate, 0.5-3 parts a porous protective carrier loaded with urease-producing Bacillus licheniformis spores, 0.05-0.5 parts a nutrient protectant, and 1-5 parts a calcium source. The binder, by weight, includes: 94-98 parts deionized water, urea, 0.02-0.2 parts nutrients, 0.01-0.5 parts a pH adjuster, 0.5-5 parts a viscosity adjuster, and 0.01-0.2 parts a surface tension adjuster. The concentration of urea in the binder is 0.02-0.10 mol / L. This invention solves the problems of existing inkjet 3D printing materials having internal pores, microcracks, and weak interlayer interfaces after molding, limiting the improvement of the mechanical properties of printed parts in the later stages, and the difficulty in adapting the microbial mineralization system to the inkjet 3D printing process.

The invention provides a microorganism-loaded silicon-calcium-potassium-magnesium-phosphorus soil conditioner based on double-tailing synergistic activation and a preparation method thereof, and relates to the field of solid waste recycling. The soil conditioner comprises a porous carrier, and a protective layer, an adsorption layer, a fungicide layer and a fixing layer which are sequentially arranged on the surface of the porous carrier, the porous carrier comprises the following raw materials: phosphate tailings, silicate tailings, a pore-forming agent and a binder solution; the raw materials of the protective layer comprise a first coating solution and a first cross-linking solution; the first coating solution comprises an aqueous solution consisting of sodium alginate, chitosan, glycerol and sodium dihydrogen phosphate; the raw material of the adsorption layer comprises a second coating solution which specifically comprises an aqueous solution consisting of chitosan, humic acid and acetic acid; the raw materials of the microbial agent layer comprise a microbial agent, a pH buffer agent, a cell protective agent, a nutrition activator and water; the fixed layer is prepared from a third coating solution and a second cross-linking solution. The soil conditioner has the effects of providing valuable components, inhibiting pathogen growth, promoting plant growth and the like.

The invention relates to the technical field of fertilizer preparation, and particularly discloses a modified flotation phosphate tailing-based composite calcium magnesium phosphate fertilizer and a preparation method thereof, and the composite calcium magnesium phosphate fertilizer is prepared from modified flotation phosphate tailings, dolomite, limestone, an activator, a binder, a magnesium supplement conditioner and water. The flotation phosphate tailings are deeply modified by adopting a composite pretreatment liquid synergistic activation-gradient composite modification process, so that the effectiveness of nutrients such as phosphorus, calcium and magnesium in the flotation phosphate tailings and the environmental safety are remarkably improved; and through the raw material compounding design of calcium and magnesium source collaboration, gradient magnesium supplementation and conditioning synergism, quick-acting and long-acting collaborative supply of nutrients and a soil improvement function are realized. The flotation phosphate tailings are used as main raw materials, the technological process is simple, energy consumption is low, the prepared composite calcium magnesium phosphate fertilizer is balanced in nutrient, lasting in fertilizer efficiency and excellent in physical performance, and unification of solid waste recycling, product high value and production greenization is achieved.

The invention provides a reinforcing material suitable for a carbon sequestration rock interface and a preparation method thereof, and the preparation method comprises the following steps: calcining magnesium oxide powder to obtain active magnesium oxide; uniformly mixing active magnesium oxide with monopotassium phosphate to obtain first mixed powder; the molar ratio of the active magnesium oxide to the monopotassium phosphate is (3-5): 1; adding borax accounting for 5-10% of the mass of the active magnesium oxide into the first mixed powder, and uniformly mixing to obtain second mixed powder; mixing the second mixed powder with mixing water according to a water-material mass ratio of 0.10-0.40, and stirring to obtain magnesium phosphate cement paste; within the initial setting time after the magnesium phosphate cement paste is prepared, the paste is injected into a mold through pressure grouting equipment, and curing carbonization is conducted after the paste and rock are formed. By the adoption of the technical scheme, the interface sealing life is greatly prolonged, and the anti-carbonization performance is remarkably improved.

The invention discloses an LF refining furnace plastic refractory and a production method thereof, and relates to the technical field of plastic manufacturing. The LF refining furnace plastic refractory is prepared from the following components in parts by weight: 60-75 parts of seawater magnesia particles, 5-8 parts of seawater magnesia ultrafine powder, 5-8 parts of an aluminum sulfate solution, 4-8 parts of acetylated castor oil, 5-8 parts of east mud, 1-3 parts of spodumene, 2.5-3.5 parts of ammonium magnesium phosphate whiskers, 1-2 parts of liquid raw molasses, 2-4 parts of silica fume, 1-2 parts of amino phenolic resin powder, 1-1.5 parts of sodium hexametaphosphate and 0.5-1 part of British glue. According to the plastic refractory for the LF refining furnace, the seawater magnesia particles with specific particle size distribution serve as aggregate, close packing and basic fire resistance of the material are ensured, the seawater magnesia ultrafine powder and the ammonium magnesium phosphate whiskers are matched, the high-temperature breaking strength and toughness of the material are improved, and the final product has excellent plasticity.

Disclosed is a fertilizer containing a mixture containing i) calcium ammonium phosphate (CaNH4PO4), magnesium ammonium phosphate (MgNH4PO4), or a combination of CaNH4PO4 and MgNH4PO4 and ii) a mixture of calcium sulfate and ammonium sulfate ((NH4)2Ca(SO4)2), a mixture of magnesium sulfate and ammonium sulfate ((NH4)2Mg(SO4)2), or a combination of the (NH4)2Ca(SO4)2, and the (NH4)2Mg(SO4)2. Methods of making and using the fertilizer are also disclosed.

This invention relates to the field of cultivation substrate technology, and more particularly to a cultivation substrate and its preparation process. The cultivation substrate, from bottom to top, comprises: a perlite granule layer, a first fiber substrate layer, a magnesium ammonium phosphate slow-release fertilizer layer, a temperature-sensitive water-retaining agent layer, and a second fiber substrate layer; the thickness ratio of the perlite granule layer, the first fiber substrate layer, the magnesium ammonium phosphate slow-release fertilizer layer, the temperature-sensitive water-retaining agent layer, and the second fiber substrate layer is 5-10:20-40:1-2:0.1-1:10-30; the perlite granule layer is made of perlite granules with a particle size of 2-4 mm. This invention effectively achieves the synergistic effect of vertical water penetration and lateral diffusion, and can retain water under low temperature and high humidity conditions, while releasing water and increasing porosity under high temperature and low humidity conditions. The system exhibits excellent stability, effectively preventing nutrient loss, and can stably maintain the substrate state even after long-term use.

The invention relates to a sliding material based on PTFE polymer with a filler to improve the friction properties, wherein the filler comprises at least one phosphate, in particular calcium phosphate, calcium pyrophosphate, magnesium phosphate, magnesium pyrophosphate, lithium phosphate, hydroxyapatite or combinations thereof, and at least one metal sulfide, wherein the proportion of metal sulfide is > 2%. The invention also relates to the use of the sliding material.

This invention relates to the field of refractory materials, specifically to a refractory material resistant to manganese ferroalloy (MFC) erosion and its preparation method. It addresses the problems of existing refractory materials suffering from long-term MFC erosion, carbon oxidation leading to micropores, and unstable boundary conditions causing a decrease in the melting point of the reactive metamorphic layer, resulting in MFC erosion growing inwards and a short service life. The working layer, by weight, consists of 80-95 parts of ASC brick base material, 2-7 parts of modified filler, and 10-20 parts of interface isolation material. The modified filler is barium zirconate or zirconium silicate, and the modified material is tantalum nitride. The mass ratio of filler to tantalum nitride is 1-6:1. The interface isolation material is composed of magnesium phosphate, aluminum phosphate, and tungsten carbide, with a mass ratio of magnesium phosphate, aluminum phosphate, and tungsten carbide of 4-6:4-6:8-12. This invention enables the refractory material to possess extremely high MFC resistance, significantly extending its service life.

The invention discloses a comprehensive nutrition regulation and control method for improving overwintering cold resistance of citrus fruit trees, and relates to the field of fruit tree cultivation, and the method comprises the following steps: S1, soil conditioning and mycorrhiza inoculation after fruit picking: determining the content of rapidly available phosphorus in orchard soil, when the content of rapidly available phosphorus is greater than 30mg / kg, firstly applying humic acid and calcium magnesium phosphate fertilizer for phosphorus reduction treatment, and after the content of rapidly available phosphorus is reduced to be less than or equal to 20mg / kg, then applying a nutrient solution; digging radial short ditches on the inner side of a water drip of a tree crown, mixing a pre-activated arbuscular mycorrhizal fungus inoculant with an organic carrier, filling the mixture into the ditches, and earthing and watering; according to the comprehensive nutrition regulation and control method for improving the overwintering cold resistance of the citrus fruit trees, through soil phosphorus pre-regulation and local enrichment inoculation methods, the mycorrhizal fungus colonization rate is increased to 50% or above from less than 20%, and the mycorrhizal inoculation effect and the input-output ratio are remarkably improved.

The invention relates to the technical field of porous materials, and discloses a magnesium phosphate cement-based porous sound absorption material and a preparation method thereof.The trehalose is added into a protein pore-forming agent raw material, and the hydrolysis rate of a protein pore-forming agent in acid magnesium phosphate cement paste can be slowed down in the initial hydration stage of magnesium phosphate cement; therefore, the foam stabilizing effect of the protein pore-forming agent is improved, and the stability of the pore structure in the high-flowability magnesium phosphate cement paste is ensured. Besides, protein in the protein pore-forming agent is gradually hydrolyzed into amino acid or peptide substances in the acid environment of the magnesium phosphate cement paste, and after carboxyl in the amino acid or peptide substances is complexed with part of magnesium ions in the paste, part of the magnesium ions are dispersed in pore channels formed by the protein pore-forming agent; and the release of amino groups gradually forms an alkaline environment around magnesium ions, so that the magnesium ions are induced to generate fibrous magnesium hydroxide, the pore structure is supported, and the problem of pore collapse in the standing and curing process is avoided.

The present application relates to the field of agricultural soil improvement and orchard fertilization technology, and discloses a kind of southern red soil area orchard annual green manure covering and carbon-increasing quality improving method, including that mature livestock and poultry manure is mixed with industrial grade calcium-magnesium phosphate fertilizer and applied to surface soil before green manure sowing;Sowing Indian cowpea in spring, mixed sowing Chinese milk vetch and field radish in autumn;Green manure of leguminous plants is mowed in situ when it is in full bloom to initial pod stage to make it flat;Uniformly spray directional wood-decay fungi complex liquid to the surface of green manure;Use pyroligneous acid to wet crushed dry crop straw, cover micro-acid straw on the surface of green manure;Mechanically subsoil in the following autumn, and inject PAM composite biomass charcoal suspension into the bottom of subsoiling groove simultaneously.The present application neutralizes and intercepts ammonia gas released by green manure to block nitrogen volatilization by using micro-acid straw, accelerates the degradation of macromolecular lignocellulose by using wood-decay fungi, and constructs deep stable carbon sink by combining with deep injection of porous carbon suspension, thereby effectively improving the overall carbon pool capacity of red soil profile.

The application belongs to the technical field of cement-based grouting and provides a water-based epoxy resin mortar rapid repair material for rapid repair of high-iron tunnel water leakage disease and a preparation process, which is made of the following components: 80-110 parts of magnesium phosphate cement, 5-20 parts of water-based epoxy resin, 8-25 parts of epoxy resin curing agent, 10-25 parts of fly ash, 5-10 parts of retarder, 1-2 parts of defoaming agent and 12-25 parts of water; the magnesium phosphate cement comprises magnesium oxide and phosphate; the magnesium oxide is a mixture of dead-burned magnesium oxide and light-burned magnesium oxide, and the mass ratio of the two is 3:1-20:1. The grouting material prepared by the formula and the preparation method has the advantages of short setting time, high early strength, strong wet adhesion, good durability and good fluidity.

A rebounding track building board made essentially from a magnesium oxychloride hydrated cement, a magnesium oxysulfate hydrated cement, a mixture of the two materials, and / or a magnesium phosphate cement, the cement preferably comprising one or more high modulus fibrous materials distributed in the cement and one or more low modulus fibrous materials distributed in the cement; a method of manufacturing the rebounding track building board and a rebounding track system comprising the rebounding track building board.