399 results about "Magnesium phosphate" patented technology

The invention discloses low-carbon high-freezing-resistance magnesium phosphate cement mortar and a preparation method and application thereof, and belongs to the technical field of constructional engineering materials, the mortar comprises low-carbon magnesium phosphate cement, river sand, hydrolyzed silanol and mixing water; the hydrolyzed silanol is a product obtained by hydrolyzing a silane coupling agent in ethanol and water under an acidic condition; the invention relates to a high-strength concrete, which is prepared from the following formula components in parts by mass: 145 to 250 parts of low-carbon magnesium phosphate cement, 145 to 250 parts of river sand, 7 to 35 parts of silane coupling agent, 42 to 210 parts of ethanol, 21 to 105 parts of water and 10 to 30 parts of water for mixing. The cement has the advantages of adjustable setting time, low carbon, energy conservation, good mechanical properties, strong water resistance and freezing resistance and the like.

The invention discloses a preparation method of a curing agent with biological self-healing capability, which comprises the following steps: preparing a bacillus pasteurii bacterial solution, preparing the bacillus pasteurii bacterial solution into an endophytic spore solution, immersing polyvinyl alcohol fibers into a sodium alginate / endophytic spore solution, taking out the polyvinyl alcohol fibers, immediately immersing the polyvinyl alcohol fibers into a calcium acetate solution, drying the polyvinyl alcohol fibers to obtain core fibers with a hydrogel coating, and curing the core fibers with the hydrogel coating to obtain the curing agent with biological self-healing capability. The preparation method comprises the following steps: taking magnesium phosphate cement as a raw material, immediately immersing the magnesium phosphate cement into a chloroform solution of a polystyrene and polylactic acid polymer blend, drying to obtain a coated microbial liquid, premixing urea and glucose, doping the premixed urea and glucose into the magnesium phosphate cement, uniformly stirring, adding the coated microbial liquid, and uniformly stirring to obtain the product. According to the invention, phosphate cement is adopted as the curing agent, has the advantages of high strength, short setting time, strong durability, low alkalinity, good biocompatibility and the like, and compared with the curing agent in the prior art, the curing agent not only has a good curing effect, but also has a crack self-healing function, and is especially suitable for reinforcing foundation soil.

The invention provides magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete is prepared from the following raw materials in parts by weight: 10-20 parts of phosphate, 30-50 parts of active magnesium oxide, 0.5-3 parts of a retarder, 5-15 parts of a mineral admixture, 0.5-4 parts of a functional additive, 20-30 parts of fine aggregate, 2-5 parts of reinforced fibers and 10-28 parts of water. The invention also provides a preparation method of the magnesium phosphate cement-based concrete. The magnesium phosphate cement-based concrete provided by the invention has a multi-layer anti-corrosion barrier, a compact microstructure, an intelligent ion barrier and good environmental adaptability, and can meet the use requirements in complex and severe environments.

The invention belongs to the field of modified self-repairing calcium aluminate cement 3D printing, and particularly relates to a phosphate modified self-repairing calcium aluminate cement 3D printing material and a preparation method thereof. The phosphate modified self-repairing calcium aluminate cement 3D printing material prepared by the invention is prepared from the following raw materials in parts by mass: 60 to 70 parts of calcium aluminate cement, 3 to 7 parts of silica fume, 2 to 4 parts of metakaolin, 0.5 to 3.5 parts of double-template modified calcium bentonite, 0.8 to 1.5 parts of amino modified sodium polyphosphate and 0.15 to 0.8 part of basalt fiber. The invention relates to a concrete anti-microbial agent, which is prepared from the following raw materials in parts by weight: 20-30 parts of water, 20-30 parts of water, 20-30 parts of water, 20-30 parts of nano calcium carbonate, 20-30 parts of nano calcium carbonate, 20-30 parts of magnesium phosphate cement coated bacteria-loaded porous microspheres, 20-30 parts of a polycarboxylate superplasticizer, 20-30 parts of an organic silicon defoaming agent and 25-35 parts of mixing water. The technical-economic cooperation requirement of building 3D printing under complex working conditions is met, and various indexes of phosphate modified calcium aluminate cement applied to the 3D printing technology are met.

The invention discloses a thermal shock resistant phosphate cement-based steel structure coating, which comprises: a bottom coating, which comprises 80-90 parts of potassium magnesium phosphate cement, 5-10 parts of an inorganic filler, 0.5-2.0 parts of an antifoaming agent, 1.0-3.0 parts of a high temperature resistant auxiliary agent, and 0.5-1.5 parts of reinforced fibers; and the reinforced surface layer is coated on the outer side of the bottom coating and comprises 60-70 parts of potassium magnesium phosphate cement, 5-10 parts of an inorganic salt phase change material, 5-15 parts of a fiber reinforced material, 2.0-5.0 parts of a repairing agent, 0.8-1.5 parts of a fire-resistant additive and 10-20 parts of lightweight aggregate. The invention further discloses a construction method of the thermal shock resistant phosphate cement-based steel structure coating. The phosphate cement-based coating is formed by combining a double-layer gradual change structure, the self-repairing agent and the heat-resistant phase change material, the durability and thermal shock resistance of the coating in a high-temperature environment can be remarkably improved, meanwhile, the excellent self-repairing capacity is achieved, and the service life of the coating is prolonged.

The invention relates to the technical field of cement-based anticorrosive materials, and particularly discloses a modified magnesium phosphate cement anticorrosive material as well as a use method and application thereof. The anticorrosive material comprises the following components in parts by weight: 100 parts of modified magnesium phosphate cement, 3-15 parts of a retarder, 1-10 parts of an epoxy resin glue solution, 0.5-5 parts of metakaolin and 15-20 parts of water. The modified magnesium phosphate cement comprises dead burned magnesium oxide and modified phosphate in a mass ratio of (1-4): 1. The modified phosphate is prepared from the following raw materials: nano aluminum oxide, sodium citrate and phosphate in a mass ratio of (0.5-1.5): (0.5-1.5): (20-25). The epoxy resin glue solution comprises uncured epoxy resin glue and a curing agent. The anti-corrosion material provided by the invention has the technical advantages of strong adhesive property and excellent anti-corrosion property, and can better provide protection for a steel structure serving in a marine environment.

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 provides high-strength retarded magnesium phosphate cement as well as a preparation method and application thereof, and belongs to the technical field of magnesium phosphate cement. The high-strength retarded magnesium phosphate cement provided by the invention is prepared from the following raw materials in parts by mass: 60 to 95 parts of dead burned magnesia powder, 20 to 50 parts of phosphate, 3 to 15 parts of a composite retarder, 5 to 20 parts of an admixture, 8 to 14 parts of fly ash microspheres, 1 to 2 parts of carbon nanotubes, 1 to 5 parts of carbon fibers and 5 to 30 parts of water, the composite retarder comprises sodium tripolyphosphate, zinc acetate, EDTA (Ethylene Diamine Tetraacetic Acid) disodium and polyacrylic acid; the admixture comprises phosphorus slag powder and silica fume. The result of the embodiment shows that the setting time of the high-strength delayed-setting magnesium phosphate cement provided by the invention is controllable between dozens of minutes and dozens of hours, meanwhile, the compressive strength of the magnesium phosphate cement 28d is greater than 90MPa, and the magnesium phosphate cement has excellent mechanical properties.

The invention relates to a method for preparing a silicon-calcium-potassium-magnesium phosphate fertilizer from phosphate tailings, and relates to the technical field of phosphate tailing recycling, the method for preparing the silicon-calcium-potassium-magnesium phosphate fertilizer from the phosphate tailings comprises the following steps: carrying out acidolysis on the phosphate tailings to obtain a leaching residue A and a leaching solution M; an impurity removal agent is added into the leaching slag A, heavy metal elements in the leaching slag A are removed, and leaching slag B is obtained after solid-liquid separation; activating the leaching residue B by hot alkali, and performing solid-liquid separation to obtain a filter residue A; a phosphorus supplement is added into the leachate M, and filter residues B are obtained after solid-liquid separation; and fully mixing the filter residue A and the filter residue B to obtain the silicon-calcium-potassium-magnesium phosphate fertilizer. The method disclosed by the invention is low in energy consumption and high in phosphate tailing recovery rate, and the prepared silicon-calcium-potassium-magnesium phosphate fertilizer has a relatively high adsorption effect on part of main heavy metals.

The invention provides high-bending-resistance injectable magnesium phosphate bone cement. The high-bending-resistance injectable magnesium phosphate bone cement is prepared from solid-phase powder, reinforcing filler and water, the solid-phase powder comprises the following components in parts by weight: 50-70 parts of magnesium phosphate salt and 30-50 parts of hydrogen phosphate, and the magnesium phosphate salt comprises trimagnesium phosphate; the reinforcing filler comprises a polyurethane modified epoxy resin emulsion; based on the polyurethane modified epoxy resin emulsion with the solid content of 30%-50%, the mass fractions of the solid phase powder, the reinforcing filler and the water in the bone cement are 66-70 wt%, 1-7 wt% and 23-33 wt% respectively. The high-bending-resistance injectable magnesium phosphate bone cement is high in bending strength and suitable for bone defect areas bearing multidirectional loads.

The invention discloses a modified magnesium phosphate cement grouting material as well as a preparation method and application thereof. The modified magnesium phosphate cement grouting material comprises magnesium phosphate cement prepared from dead burned magnesium oxide, ammonium dihydrogen phosphate, borax, a polycarboxylate superplasticizer and water; and a water repellent agent added to the magnesium phosphate cement. Further, glacial acetic acid is added during preparation of the magnesium phosphate cement. Furthermore, the modified magnesium phosphate cement grouting material further comprises silane coupling agent modified PVA (polyvinyl alcohol) fibers. The MPC is endowed with excellent compressive and breaking strength, low-temperature toughness, water resistance and controllable setting time by virtue of the synergistic effect of delayed coagulation of glacial acetic acid and the silane coupling agent modified PVA fiber and the effect of the water repellent agent, so that the MPC has high durability and construction feasibility in prestressed duct grouting engineering in severe cold areas; and a reliable solution is provided for engineering application in an extreme environment.

The invention relates to a preparation method of low-carbon magnesium phosphate cement. The low-carbon magnesium phosphate cement is prepared from the following raw materials in parts by weight: 40-50 parts of magnesium oxide, 20-30 parts of phosphate, 1-2 parts of a retarder, 6-8 parts of quartz powder, 1-3 parts of glass fibers, 0.5-1.5 parts of polypropylene fibers, 1-3 parts of steel fibers, 10-20 parts of slag powder, 5-15 parts of silica fume, 1-2 parts of nano silicon dioxide, 0.5-1.5 parts of nano aluminum oxide and 4-6 parts of an additive. According to the preparation method of the low-carbon magnesium phosphate cement, mineral admixtures or industrial waste residues which are lower in price are introduced to serve as partial substitute materials, the requirement for high-cost raw materials is reduced, waste such as fly ash and slag can be used for replacing partial expensive raw materials, the production cost is reduced, cyclic utilization of resources is promoted, and the low-carbon magnesium phosphate cement is suitable for industrial production. Secondly, in order to overcome the problem that the strength of traditional low-carbon magnesium phosphate cement is reduced in water, a special retarder, a stabilizer and other modified materials are added, and dissolution of hydration products in water can be effectively inhibited.

The invention relates to the technical field of cement-based patching materials, in particular to a modified brucite fiber reinforced magnesium phosphate cement-based patching material and application thereof. The repairing material comprises the following components in parts by weight: 60-70 parts of magnesium oxide, 15-20 parts of phosphate, 5-9 parts of a retarder, 3-5 parts of modified brucite fibers and 10-15 parts of water. The modified brucite fiber is prepared by the following method: (1) soaking brucite fiber in a dihydric phosphate solution, separating out the brucite fiber after soaking, washing and drying to obtain pretreated fiber; and (2) placing the pretreated fiber in an absolute ethyl alcohol solution of methyltrimethoxysilane, then reacting under a heating condition, separating out the fiber after the reaction is completed, and drying to obtain the modified brucite fiber. The problem that the fluidity, the bonding strength and the fracture toughness of a magnesium phosphate cement-based thin layer repairing material doped with fibers cannot be considered at the same time is effectively solved.

The invention relates to a water-resistant magnesium phosphate cement-based material which comprises the following components: magnesium oxide, a composite phosphate compound, borax, a sodium silicate solution, water, a polyethylene glycol derivative, polyacrylamide and an ammonium sulfate solution. According to the water-resistant magnesium phosphate cement-based material, precipitation of water can be controlled in the preparation process, so that the speed of a hydration reaction is conveniently controlled, and the situation that phosphate is fixed in a matrix and cannot continue to participate in the reaction due to the fact that the hydration reaction is too fast is avoided; according to the water-resistant magnesium phosphate cement-based material, the fluidity of a mixture can be better in the preparation process, so that the mixture can be stirred and mixed more sufficiently, and the polyethylene glycol derivative can introduce bubbles to block capillary pore channels in concrete; therefore, permeation of external water can be reduced in the using process of the water-resistant magnesium phosphate cement-based material.

The invention discloses a double-liquid magnesium phosphate early-strength high-strength grouting material and a preparation method thereof.The grouting material is composed of a liquid A and a liquid B. The liquid A is composed of powder A and water in parts by weight and comprises dead burned magnesia powder, a defoaming agent, steel slag powder, a retarder I and water, and the liquid B is composed of powder B and water in parts by weight and comprises powder B and water in parts by weight. Wherein the monopotassium phosphate, the superfine powder, the polymer rubber powder, the retarder II and the water have the advantages that the stirring time is shortened, the setting time is controllable, the flowability is good, the repair requirement can be met more quickly, the construction period is shortened, and the cane sugar and the borax are used as the retarders, so that the setting time can be controlled, and the early strength can be improved; surplus phosphate in a grouting material matrix is consumed by using the steel slag powder, so that some amorphous gel products can be generated, and the mechanical property is improved; the redispersible latex powder is utilized to form a polymer film in the slurry to wrap a hydration product, so that the water resistance is improved, and the synergistic modification effect is achieved.

The invention relates to a bi-component magnesium phosphate cement spraying foaming material and a preparation method thereof, the bi-component magnesium phosphate cement spraying foaming material comprises a component A and a component B in a dry powder mass ratio of 100: (70-80), the component A comprises dead burned magnesium oxide, slag, a water reducing agent, a thickening agent, a foam stabilizer and a carbonate foaming agent; and the component B comprises phosphate, fly ash and a retarder. During use, the component A slurry and the component B slurry are atomized and sprayed out through a double-head spray gun and are mixed outside a nozzle, a chemical reaction is immediately carried out, foaming expansion and condensation hardening are completed, and a lightweight porous structure is formed. Compared with the prior art, the problems that a single-component foaming material is out of control in foaming, hardened in advance, difficult to spray and the like are effectively solved, and rapid spraying forming of the inorganic thermal insulation material is achieved. The prepared material is adjustable in dry density and uniform in pore size distribution, has the characteristics of high strength, low heat conductivity, small shrinkage rate, high durability and the like, meets the A-level non-combustible standard, and can be widely applied to building wall and roof thermal insulation engineering.

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 relates to the technical field of culture substrates, in particular to a culture substrate and a preparation process thereof. The culture medium sequentially comprises a perlite particle layer, a first fiber base material layer, an ammonium magnesium phosphate slow-release fertilizer layer, a temperature-sensitive water-retaining agent layer and a second fiber base material layer from bottom to top, the thickness ratio of the perlite particle layer to the first fiber base material layer to the ammonium magnesium phosphate slow-release fertilizer layer to the temperature-sensitive water-retaining agent layer to the second fiber base material layer is (5-10): (20-40): (1-2): (0.1-1): (10-30); the raw material of the perlite particle layer is perlite particles with the particle size of 2-4 mm. Synergistic longitudinal permeation and transverse diffusion of water can be effectively achieved, water can be locked at low temperature and high humidity, water can be released at high temperature and low humidity, the porosity is enlarged, the system stability is excellent, nutrient substance loss can be effectively avoided, and the substrate state can be stably maintained even if the substrate is used for a long time.

The invention relates to cation-doped iron phosphate as well as a preparation method and application thereof, the preparation method comprises the following steps: firstly, mixing phosphoric acid containing iron and magnesium with an extraction system for extraction and aluminum removal to obtain aluminum-removed phosphoric acid; mixing the aluminum-removed phosphoric acid obtained in the step (1), an iron source and an oxidizing agent to obtain iron phosphate dihydrate; and finally, calcining the iron phosphate dihydrate obtained in the step (2) to obtain Mg < 2 + > doped iron phosphate. The Mg < 2 + >-doped iron phosphate is prepared by doping magnesium ions into crystal lattices of iron phosphate to generate defects by utilizing iron ions and magnesium ions in the iron-containing magnesium phosphate, the yield is preferably up to 89.89% or above, the utilization rate of Mg in the raw materials is up to 88.16% or above, the utilization rate of Fe is preferably up to 98.70% or above, and the Mg < 2 + >-doped iron phosphate has the advantages of high electrochemical performance, simple preparation process and low cost. And a low-cost high-quality raw material is provided for the lithium iron phosphate material.

The invention discloses a high-strength low-immunoreaction bone bonding material and a preparation and application method thereof. The bone binding material comprises tetracalcium phosphate, serine phosphate, magnesium phosphate and a sodium citrate solution. According to the preparation method, tetracalcium phosphate, phosphoserine, magnesium phosphate powder and a sodium citrate solution are fully mixed and reacted by utilizing a hedging device consisting of a screw injector and a connecting pipe. And extruding the mixed liquid material through a filter membrane to complete the preparation of the bone adhesive material. The bone binding material can be used for preparing bionic sclerotin, binding broken bones in comminuted fractures or smearing the bone binding material to bone gaps, and in the decomposition process, the bone binding material can continuously release magnesium ions, so that the immune environment of early bone repair is regulated and controlled, the bone repair process is accelerated, and bone healing is promoted. Meanwhile, experimental data prove that the bone adhesive material provided by the invention can provide stable supporting strength, has no potential toxicity to fibroblasts, and is good in biocompatibility.

The invention discloses a rare earth doped humic acid-based retarder, a preparation method and application thereof in grouting materials, and belongs to the technical field of inorganic non-metal building materials. The invention discloses a rare earth doped humic acid-based retarder, which is prepared from the following raw materials in parts by weight: 35 to 50 parts of rare earth modified humic acid, 10 to 15 parts of amphiphilic phosphonate dispersing agent, 5 to 8 parts of magnesium phosphate corrosion inhibition reinforcing agent, 8 to 12 parts of nano silicon dioxide and 3 to 5 parts of function regulator. The loading capacity of rare earth oxide in the rare earth modified humic acid is 8-12wt%. The retarder provided by the invention realizes effective retarding through an innovative hydration inhibition mechanism, and has significant advantages in temperature response characteristics, hydrolysis resistance and diversified regulation performance. The effects are synergistic, so that the grouting agent is particularly suitable for grouting construction under severe conditions such as high temperature and the like, and a more stable, reliable and flexible solution is provided for engineering.

The invention relates to a high-temperature-resistant high-toughness epoxy adhesive film and a preparation method thereof, and belongs to the technical field of epoxy adhesive films. The high-temperature resistance and mechanical strength of the filler are remarkably improved by calcining a mixture of magnesium phosphate, glucose and montmorillonite at a high temperature, filler agglomeration is reduced by a carbonaceous film formed by carbonizing glucose, and the dispersity and compatibility are improved; after the carbon fibers are pretreated by nitric acid, the interface bonding force between the carbon fibers and the resin matrix and the calcined montmorillonite is enhanced, and the overall toughness of the composite filler is improved; and the composite filler forms a skeleton structure in a resin matrix, so that the toughness and high temperature resistance of the epoxy adhesive film are effectively improved. Besides, the polyamic acid is added into the epoxy resin, and the high temperature resistance and toughness of the epoxy resin are further improved through the formation of a semi-interpenetrating network structure or chemical bond action by utilizing the characteristic that a polyamic acid molecular chain segment can maintain relatively good mechanical properties at high temperature; the prepared epoxy adhesive film is suitable for various application scenes with high-temperature and high-toughness requirements.

The invention discloses a novel historic building repair caulking inorganic adhesive and a preparation method thereof, and relates to the technical field of inorganic adhesives. The concrete is prepared from 30-48 parts of dead burned magnesium oxide, 20-30 parts of monopotassium phosphate, 2-6 parts of borax, 6-24 parts of fine aggregate, 3-8 parts of basalt fiber, 5-15 parts of glutinous rice flour and 15-20 parts of water. The preparation method comprises the following steps: step 1, weighing various materials according to the ratio of the raw materials; the preparation method comprises the following steps: step 1, adding dead burned magnesium oxide into a cement mortar stirrer, and then pouring potassium dihydrogen phosphate, fine aggregate, glutinous rice flour, basalt fiber, borax and water into the cement mortar stirrer to be stirred to prepare uniform slurry; step 2, adding dead burned magnesium oxide and the rest of water, and rapidly stirring to obtain magnesium phosphate regenerated inorganic glue; the magnesium phosphate regenerated inorganic adhesive prepared by doping the regenerated fine aggregate and the glutinous rice flour into the magnesium phosphate inorganic adhesive has the advantages of low temperature resistance, good durability, excellent bonding effect, rapid hardening, early strength and high strength.

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.

To provide a soil improvement method utilizing urea and urease, allowing reduction of ammonia generated in the course of soil improvement.SOLUTION: The present invention provides a soil improvement method in which calcium carbonate is generated from carbon dioxide produced through urea and urease to solidify soil, the method characterized by further adding a phosphorus compound and a magnesium compound to produce magnesium ammonium phosphate from at least a part of the ammonia generated through urea and urease.SELECTED DRAWING: None

The invention belongs to the field of biomedical materials, and relates to a chitosan calcium sulphoaluminate-potassium magnesium phosphate composite bone material as well as a preparation method and application thereof. The calcium sulphoaluminate-potassium magnesium phosphate composite bone material is formed by curing a calcium sulphoaluminate-potassium magnesium phosphate composite bone material and a chitosan solution, the calcium sulphoaluminate-potassium magnesium phosphate composite bone material comprises the following components in percentage by mass: 5-40% of calcium sulphoaluminate, 0.01-3.0% of boric acid and the balance of dead burned magnesium oxide and monopotassium phosphate, and the molar ratio of magnesium in the dead burned magnesium oxide to phosphorus in the monopotassium phosphate is (1-4): 1. The material provided by the invention has remarkable mechanical property, biological activity, cytotoxicity, injectability, non-transmissivity, coagulation property, degradability, absorbability and the like. Meanwhile, the bone material contains unreacted and degradable monopotassium phosphate, magnesium oxide and other substances, and due to the reasonable degradability and absorbability design of the bone material, the material can be gradually degraded in vivo and can grow along with bone tissue, and the treatment effect is further improved.

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.

The invention discloses a magnesium phosphate-based cement grouting material as well as a preparation method and application thereof. Raw materials of the magnesium phosphate-based cement grouting material comprise a component A and a component B, the component A is prepared from the following raw materials in parts by weight: 140 to 200 parts of calcined magnesium oxide, 0 to 30 parts of bentonite, 0.2 to 0.5 part of hydroxypropyl methyl cellulose, 1 to 10 parts of an additive and 70 to 140 parts of water; the component B comprises the following raw materials in parts by weight: 70-100 parts of first dihydric phosphate, 20-50 parts of pretreated polymer water-absorbent resin, 0.5-2 parts of sodium polyacrylate and 30-70 parts of water; the pretreated high-molecular water-absorbent resin is obtained by soaking high-molecular water-absorbent resin in an aqueous solution of second dihydric phosphate. The magnesium phosphate-based cement grouting material disclosed by the invention has the characteristics of low shrinkage, short and adjustable setting time, high compressive strength, simplicity in construction, low cost, environment friendliness, good slurry injectability, good water dispersibility resistance and good durability in a long-term water soaking environment.

The invention discloses composite delayed coagulation type magnesium phosphate cement and a preparation method thereof, and relates to the technical field of building materials, the composite delayed coagulation type magnesium phosphate cement comprises a dead burned magnesium oxide and mineral admixture mixture, phosphate, a composite retarder and glue-containing water, in the dead burned magnesium oxide and the mineral admixture, the mass ratio of dead burned magnesium oxide to the mineral admixture is 3: 2, and the mass ratio of phosphate to the composite retarder to the glue-containing water is 1: 1. The mass ratio of the dead burned magnesium oxide and mineral admixture mixture to the phosphate is 3: 1, the mass of the composite retarder is 7-24% of the mass of the dead burned magnesium oxide and mineral admixture mixture, and the water-binder ratio in the glue is 0.18-0.20. The preparation method comprises the steps of high-temperature pretreatment of the mineral admixture, metering and dry mixing of all the components and cement mixing. The attapulgite and the kaolin which are treated at high temperature are mixed with dead burned magnesium oxide, so that the heat release rate at the initial stage of a hydration reaction is reduced, the cement setting time is prolonged, meanwhile, micro holes and cracks in a cement matrix can be filled, the compactness of a magnesium phosphate matrix is improved, and finally the strengths at different ages are improved.