227results about How to "Improve pore structure" patented technology

The invention relates to the technical field of building materials, and particularly discloses high-strength lightweight concrete containing hollow glass beads and a preparation method of the high-strength lightweight concrete. The high-strength lightweight concrete containing the hollow glass beads is prepared from cement, fly ash, carbon fiber grafted hollow glass beads, lightweight sand, deionized water, polypropylene fiber grafted rubber particles and a water reducing agent according to the mass ratio of (58-75): (25-38): (45-65): (20-40): (42-55): (35-55): (5-12) through mixing, mold filling, vibration molding, covering and demolding. The addition amount of the hollow glass beads is strictly controlled, the influence on the overall strength of the concrete is avoided, the density and weight of the concrete are reduced due to the addition of the light sand and the hollow glass beads, the compactness and integrity of the concrete are improved due to the synergistic effect of the two added fibers, and the raw materials have excellent cohesiveness; the concrete can effectively absorb and disperse stress, and has the advantages of excellent strength, light weight, good durability and excellent comprehensive performance.

The invention provides a redox imidazole covalent organic framework material as well as a preparation method and application thereof, belongs to the technical field of material preparation and photocatalytic preparation of hydrogen peroxide, and aims to solve the technical problem of low activity of a current covalent organic framework in preparation of hydrogen peroxide. The preparation method of the imidazole-connected redox type imidazole covalent organic framework material comprises the following steps: respectively reacting a reactant 2, 7-di-tert-butylpyrene-4, 5, 9, 10-tetraketone monomer with 4, 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ', 4', 4 ' The preparation method comprises the following steps: mixing 4, 4 '-(pyridine-2, 4, 6-triyl) tribenzaldehyde and a tri (4-formylphenyl) amine monomer, adding a solvent and a catalyst, uniformly stirring, and reacting to obtain the redox type imidazole covalent organic framework material after the reaction is finished. The application comprises the following steps: adding the covalent organic framework, oxygen and the sacrificial agent into water, and reacting under the irradiation of visible light. The preparation method is green, environment-friendly, simple and easy to implement, the prepared material has good thermal stability, and efficient visible light photocatalysis preparation of hydrogen peroxide can be achieved; meanwhile, the catalyst can be recycled and has good photocatalytic stability.

The invention discloses a marine low-temperature concrete additive and a preparation method thereof, and belongs to the technical field of concrete admixtures. The marine low-temperature concrete additive is prepared from the following raw materials: silane / polymer hybrid modified silicon dioxide, anti-freezing fibers, an air entraining and water reducing agent, silica fume, sodium hexametaphosphate and calcium chloride. Through scientific proportioning of silane / polymer hybrid modified silicon dioxide, compound anti-freezing fibers and other components, on one hand, cement matrix interface bonding is enhanced, the integrity of the internal structure of concrete is improved, microcrack initiation in the freezing and thawing cycle process is reduced, and the surface hydrophilicity of the hybrid modified silicon dioxide is enhanced; according to the present invention, by adding the cross-linked polymer, the dispersibility can be improved, the pore structure of the concrete can be optimized, the macroporosity can be reduced so as to reduce the freeze-thaw damage risk and improve the freeze-thaw erosion resistance of the concrete, and the cross-linked network structure is formed in the cement matrix so as to improve the strength and the toughness of the concrete and enhance the freeze-thaw resistance.

The invention discloses a cooling device for cable manufacturing, and relates to the technical field of cable processing. The device comprises a base, a water storage tank is fixed to the middle of the top face of the base, guide rollers are rotationally installed on the left side and the right side of the top of the base through supports, and an air cooling fan is arranged on the right side of the top of the inner wall of the water storage tank; the water cooling device comprises a water pump, a U-shaped water pipe, a spraying pipe, two sleeve plates, a cross rod, a plurality of slapping plates and a plurality of through hole blades, the water pump is fixed to the bottom of the inner wall of the water storage tank, one end of the U-shaped water pipe is fixed to the water outlet end of the water pump, and the spraying pipe is fixed to the other end of the U-shaped water pipe. Through the arrangement of the water cooling device, cooling liquid sprayed by the spraying pipe can be dispersed through the through holes of the through hole blades, so that the dispersed cooling liquid is in uniform and effective contact with the outer surface of the cable, and the cooling effect of the cooling liquid on the cable is improved.

The invention relates to the technical field of biochar preparation materials, and discloses a preparation method of a modified coal gangue-municipal sludge-based biochar soil conditioner, which comprises the following steps: crushing a coal gangue raw material and a municipal sludge raw material to obtain coal gangue powder and municipal sludge powder; the coal gangue powder and the municipal sludge powder are leached to obtain leached coal gangue powder and leached municipal sludge powder, the leached coal gangue powder and the leached municipal sludge powder are mixed to obtain mixed solid waste powder, the mixed solid waste powder is pyrolyzed to obtain pyrolyzed biochar, the pyrolyzed biochar is acidized to obtain acidized biochar, and the acidized biochar is acidized to obtain acidized biochar. The acidified biochar is subjected to ball milling, and first modified biochar is obtained; active sites of the first modified charcoal are increased, and the target charcoal soil conditioner is obtained. The soil improvement effect of the biochar can be improved.

The invention relates to the technical field of 3D printing building materials, in particular to a 3D printing geopolymer composite material with low drying shrinkage and a preparation method thereof.The 3D printing geopolymer composite material is prepared from, by mass, 400 parts of slag powder, 320 parts of fly ash, 80 parts of steel slag micro powder, 1200 parts of quartz sand, 5.1-25.6 parts of sodium hydroxide, 46.4-66.9 parts of sodium silicate, 8 parts of barium chloride and 296 parts of water. The preparation method comprises the following steps: fully mixing the slag powder, the fly ash, the steel slag micro-powder and the quartz sand according to a preset mass ratio to obtain a uniform basic powder mixture; adding an alkali activator and barium chloride into the basic powder mixture, and continuously mixing until the mixture is uniform to obtain a first mixture; and adding water into the first mixture according to a preset water-binder ratio, and carrying out stirring treatment according to a preset stirring method to obtain the 3D printing geopolymer composite material with low drying shrinkage. According to the invention, the drying shrinkage can be reduced.

The invention belongs to the technical field of new energy, and particularly discloses a catalyst for catalyzing conversion of glucose into 5-hydroxymethylfurfural and a preparation method of the catalyst. The method is used for solving the problem of low HMF selectivity in the process of converting glucose into HMF. The preparation method comprises the following steps: firstly, synthesizing hollow mesoporous silicon spheres in the presence of absolute ethyl alcohol by taking hexadecyl trimethyl ammonium bromide as a structure-directing agent, ammonia water for providing an alkaline environment and tetraethyl orthosilicate as a silicon source of silicon dioxide; then, filling sucrose serving as a carbon source into the hollow meso-porous silicon spheres, and carbonizing and removing silicon to obtain meso-porous carbon microspheres; and finally, dipping the mesoporous carbon microspheres in a tin tetrachloride pentahydrate solution to prepare the tin-loaded mesoporous carbon microsphere catalyst. The catalyst has a large specific surface area, an excellent pore structure and good hydrothermal stability, has two acidic sites of Lewis acid and # imgabs0 # acid at the same time, and can efficiently catalyze conversion of glucose into HMF.

The invention discloses a fly ash-based adsorbent as well as a preparation method and application thereof, and belongs to the technical field of adsorbent materials. The fly ash-based adsorbent is prepared from the following raw materials: modified fly ash, modified lignin, activated carbon, polyethylene glycol polyvinyl alcohol grafted copolymer, titanate and metal oxide. The coal ash is subjected to ball milling and acid modification treatment, and a surfactant is introduced, so that the adsorption sites and the adsorption efficiency of the coal ash are increased. Through the synergistic effect of the raw materials, the prepared fly ash-based adsorbent can efficiently adsorb fluorine ions in wastewater, and the fluorine ion removal rate can reach 99% after adsorption is performed for 30 min.

The invention discloses concrete with high salt corrosion resistance and a preparation method of the concrete. The concrete is prepared from 300-400 kg / m < 3 > of cement, 50-150 kg / m < 3 > of slag powder, 1000-1200 kg / m < 3 > of gravel, 650-800 kg / m < 3 > of machine-made sand, 0.5-2 kg / m < 3 > of a modified polycarboxylic acid water reducing agent, 0.005-0.01 kg / m < 3 > of an air entraining agent, 0.05-0.1 kg / m < 3 > of an ion chelating agent, 0.05-0.1 kg / m < 3 > of polyacrylamide, 0.01-0.05 kg / m < 3 > of sodium methyl silicate, 0.1-0.5 kg / m < 3 > of multiwalled carbon nanotube dispersion liquid and 140-160 kg / m < 3 > of water. The preparation method comprises the following steps: stirring and mixing the modified polycarboxylate superplasticizer, the air entraining agent, the ion chelating agent, the polyacrylamide, the sodium methyl silicate and part of the water for mixing to obtain an admixture mixed solution; sequentially putting broken stones, cement, machine-made sand, the admixture mixed solution, the multi-walled carbon nanotube dispersion liquid and the rest of mixing water into a stirrer, and stirring for 2-3 minutes, so as to obtain the concrete with high salt corrosion resistance. The concrete has high salt corrosion resistance in a complex service environment, the service life of a concrete structure is effectively prolonged, and a reliable guarantee is provided for infrastructure construction.

The invention discloses a preparation method of red-mud-based artificial soil, which comprises the following steps: A, mixing and stirring red mud, calcium-based solid waste, industrial ferric salt, manganese slag and water according to a mass ratio, and fully stirring to fully react to obtain dealkalized red mud; wherein the mass ratio of the red mud to the calcium-based solid waste to the industrial ferric salt to the manganese slag to the water is 100: (1-5): (0.1-1): (0.1-1): (10-50); b, mixing the dealkalized red mud with the fly ash, the biomass and the stable organic solid waste, and fully and uniformly stirring to obtain a mixture; and C, naturally stacking the mixture and fertilizing. The method can accelerate the red mud harmlessness and soil treatment process, and reduces the environmental pollution risk of the storage yard.

The invention discloses an oxidized crosslinked asphalt coated resin hard carbon negative electrode material and a preparation method thereof. The preparation method comprises the following steps: S1, pre-treating resin to obtain a resin precursor; s2, performing mechanical pulverization, low-temperature pre-carbonization and airflow pulverization treatment on the resin precursor to obtain low-temperature pre-carbonized ground powder; s3, the low-temperature pre-carbonized ground powder is subjected to activation pore forming and high-temperature carbonization treatment, and resin hard carbon is obtained; s4, uniformly mixing the resin hard carbon and the asphalt to obtain a mixture; s5, performing asphalt melting coating and low-temperature oxidation cross-linking treatment on the mixture to obtain oxidation cross-linked asphalt coated resin hard carbon; s6, performing high-temperature carbonization treatment on the oxidized cross-linked asphalt coated resin hard carbon to obtain coated hard carbon; and S7, carrying out post-treatment on the coated hard carbon to obtain the oxidized crosslinked asphalt coated resin hard carbon negative electrode material. The oxidized cross-linked asphalt coated resin hard carbon negative electrode material has a relatively low specific surface area, and the first reversible capacity and the initial coulombic efficiency of a battery can be remarkably improved.

The invention relates to the technical field of grease processing, in particular to a preparation method for extracting refined vegetable oil fatty acid. A preparation method for refined vegetable oil fatty acid extraction comprises the following steps: vegetable oil refining treatment and refined vegetable oil fatty acid separation and extraction. In the vegetable oil refining treatment process, the degummed vegetable oil is subjected to deacidification and decolorization treatment by using the modified rice hull-based porous carbon, so that pigments, free fatty acids and heavy metal components in the vegetable oil can be efficiently adsorbed, the effects of adsorption, deacidification and decolorization are achieved at the same time, and the vegetable oil refining efficiency is effectively improved; vegetable oil refining quality is improved, so that the extraction effect of refined vegetable oil fatty acid is improved; in the separation and extraction process of fatty acid in the refined vegetable oil, the contact between urea and saturated fatty acid in the refined vegetable oil can be promoted by adding the crystallization inclusion additive, and a stably-clathrated composite crystal is quickly formed, so that the extraction purity of unsaturated fatty acid is improved.

According to the carbon mineralization artificial stone based on the solid waste, the solid waste raw material, the aggregate, the defoaming agent, the water reducing agent, the retarder and the additive serve as raw materials, and the prepared carbon mineralization artificial stone is high in carbonization degree and excellent in mechanical strength. The additive prepared by taking an aminoguanidine compound, a silane coupling agent and a diacid compound as raw materials is introduced, so that a substance for filling pores and CO2 gas can be generated in a system, a pore structure is optimized, internal mineralization is realized, and the binding force among the components in the system can be enhanced; therefore, the carbonization degree, the carbon sequestration rate and the mechanical strength of a carbon mineralization product are improved.

The invention relates to the technical field of denitrification fillers, in particular to an autotrophic denitrification filler for denitrification and a preparation method thereof. The autotrophic denitrification filler comprises the following raw materials in parts by weight: 80-100 parts of sulfur powder, 8-12 parts of zinc carbonate powder, 8-12 parts of clay, 4-6 parts of ferric oxide, 4-6 parts of polyhydroxyalkanoate, 4-6 parts of sugarcane cellulose, 1-3 parts of cotton, 1-3 parts of a binder and 1-3 parts of a cross-linking agent. According to the method, in the high-frequency ultrasonic treatment, the sulfur powder and sodium sulfide are in non-uniform contact, so that non-uniform sunken dissolving positions can be generated on the surface of the sulfur powder, the specific surface area of the sulfur powder is effectively increased, and after the sulfur powder is used as a main raw material to prepare the filler, the filler has a relatively large contact reaction area with sewage; a good attachment and growth environment is provided for denitrifying bacteria, and the purification effect of the autotrophic denitrification filler for denitrification is improved.

The invention relates to the field of polyurethane plastics, and particularly discloses a high-strength light-weight plastic and a preparation method and application thereof.The plastic is prepared from, by weight, 9-11 parts of polyether polyol, 12-15 parts of isocyanate, 0.8-1.3 parts of foaming agent, 10-15 parts of porous modified reinforcing filler, 5-13 parts of water glass and 2-3 parts of other auxiliaries; the porous modified reinforcing filler is prepared from hydrophobic silicon dioxide aerogel, a waterborne polyurethane emulsion, a microbubble agent, a polyether surfactant and water, and the hydrophobic silicon dioxide aerogel is distributed on a gas-liquid interface of the porous modified reinforcing filler; wherein the particle size of the hydrophobic silicon dioxide aerogel is 210 to 350 nm, and the density range of the hydrophobic silicon dioxide aerogel is 0.2 to 0.25 g / cm < 3 >. According to the invention, the plastic has a stable porous structure, and the mechanical strength of the plastic is improved.

The utility model relates to the technical field of algae oil DHA (docosahexaenoic acid) treatment, and discloses a Fischer-solvent type DHA algae oil extraction, decoloration and deodorization device which comprises an evaporation bottle, a supporting frame used for supporting the evaporation bottle is arranged at the bottom of the evaporation bottle, and a heat conduction disc used for absorbing heat is fixedly installed at the bottom of the evaporation bottle. A conical diffusion pipe is fixedly mounted at the top of the evaporation bottle, the adsorber is fixedly mounted at the top of the diffusion pipe and is used for adsorbing pigments and peculiar smells so as to achieve the decoloration and deodorization effects, and the collector is fixedly mounted at the top of the adsorber and is used for collecting the peculiar smells. The collector is used for collecting condensed waste liquid, so that the situation that steam carries impurities to fall into the evaporation bottle after being condensed is avoided, through mutual cooperation of the structures, pigments and peculiar smells contained in algae oil can be effectively removed in the using process, the taste and quality of the algae oil can be conveniently improved, and the algae oil evaporation device is more practical.

The invention discloses a biomass porous carbon electrode material, a preparation method thereof and application of the biomass porous carbon electrode material in a room-temperature sodium-sulfur battery, and belongs to the technical field of preparation of a room-temperature sodium-sulfur battery positive electrode material.The biomass waste is pretreated and then pre-carbonized, then a pore-forming agent is added for mixing, ball milling and activation, a hydrochloric acid solution is added, heating and stirring are conducted, and cleaning and suction filtration are conducted to obtain the biomass porous carbon electrode material. And mixing the biomass porous carbon material with sulfur powder, and carrying out heat treatment so as to obtain the biomass porous carbon electrode material. The positive electrode is activated by a chemical reagent, has a multi-stage pore structure and inhibits the volume expansion of the positive electrode in a physical mode. According to the present invention, the large pores are beneficial to the passing of electrolyte ions, the mesopores can ensure the high sulfur loading amount, and the small pores can provide the extremely high specific surface area and the large adsorption volume, such that the shuttle effect caused by the conversion of the polysulfide in the room temperature sodium-sulfur battery can be effectively solved, and the actual specific capacity and the rate capability of the room temperature sodium-sulfur battery can be improved;

The invention discloses a screening method and application of a positive electrode material, and belongs to the technical field of battery material screening. The screening method comprises the steps that the volume density distribution of the mixed positive electrode material to be screened is measured, Gauss fitting is conducted on distribution data, a fitted curve of bimodal distribution is screened, the center value of a first peak corresponding to small particles in double peaks is r1, the half-peak width is w1, and the peak area is A1; the central value of a second peak corresponding to large particles in the double peaks is r2, the half-peak width is w2, and the peak area is A2; a is more than or equal to 0.22474 and less than or equal to 0.7321, b is more than or equal to 0.1 and less than or equal to 2, and c is more than or equal to 0.05 and less than or equal to 7; wherein a = r1 / r2, b = w1 / w2, and c = A1 / A2. The mixed positive electrode material screened by the method is beneficial to improving the pore structure, the conductivity and the electrochemical performance of a pole piece, so that the overall performance, especially the energy density, the compactness and the power performance, of the battery is improved.

The invention discloses an expanded microcrystalline graphite / Fe2O3 / SnO2 lithium ion battery micro-nano negative electrode material as well as a preparation method and application thereof, and relates to the technical field of new material preparation and new energy. Comprising the following steps: by taking high-purity microcrystalline graphite as a raw material, preparing expanded microcrystalline graphite by adopting an oxidation method and an inert atmosphere heat treatment method, then preparing an expanded microcrystalline graphite / Fe2O3 composite material by adopting a water bath method and an air atmosphere heat treatment method I, and then preparing the expanded microcrystalline graphite / Fe2O3 / SnO2 composite material by adopting a hydrothermal method and the air atmosphere heat treatment method I for the negative electrode of the lithium ion battery. The ternary composite material has the first specific discharge capacity of 1539.9 mAh / g under the current density of 0.1 A / g, the first coulombic efficiency is 70.1%, and the ternary composite material still has the specific discharge capacity of 1003.2 mAh / g after 100 cycles. The expansion effect of the high-purity microcrystalline graphite is remarkable, the lithium storage capacity and the cycling stability of the lithium ion battery negative electrode material are remarkably improved by selecting and adding the nano metal oxide, and a new thought and a new method are provided for developing the high-performance lithium ion battery negative electrode material.

The invention discloses a well cementation cement system suitable for an ultra-deep well and a preparation method of the well cementation cement system. The well cementation cement system comprises the following components in percentage by weight: 51-68wt% of G-grade oil well cement; 10 to 15 wt% of a first reinforcing material; 20 to 30 wt% of a second reinforcing material; 1-2 wt% of a high-temperature stabilizer; 1-2 wt% of a dispersant; the first reinforcing material is formed by mixing quartz sand and nano silicon dioxide according to the mass ratio of 15: 1. The well cementation cement system has excellent engineering performance, the admixtures have good adaptability and high high-temperature compressive strength and do not decline, a large amount of solid waste is used as main raw materials, and the well cementation cement system has the advantages of being environmentally friendly and low in cost.

The invention relates to the technical field of building materials, and particularly discloses high-strength premixed pervious concrete for a surface layer and a preparation method of the high-strength premixed pervious concrete. The invention relates to high-strength premixed pervious concrete for a surface layer. The concrete comprises the following components in parts by weight: 220 to 300 parts of cement, 1570 to 1720 parts of double-graded broken stone, 85 to 120 parts of water, 50 to 100 parts of mineral powder, 18 to 35 parts of anhydrite, 4 to 10 parts of soluble sulfate, 0 to 50 parts of silica fume, 0 to 50 parts of fly ash of 1000 meshes, 20 to 35 parts of quartz stone fine sand of 80 to 120 meshes, 1 to 2.5 parts of a composite water reducing agent, 0.4 to 2.4 parts of a viscosity modifier, 6 to 10 parts of wollastonite fiber powder and 0.4 to 1 part of a defoaming agent. The composite water reducing agent comprises an ether polycarboxylic acid water reducing agent and an ester polycarboxylic acid water reducing agent. The composition and proportion of the concrete are designed and adjusted, so that the concrete has a good construction effect under the premixing condition.

The invention discloses a modified asphalt-based hard carbon negative electrode material and a preparation method thereof, and belongs to the technical field of sodium ion batteries. The method comprises the following steps: performing crushing treatment on asphalt to obtain crushed asphalt, and performing pre-oxidation treatment in an air atmosphere to obtain oxidized asphalt; mixing and reacting a mixed gas composed of a carbon source gas and an organic gas with the oxidized asphalt by adopting a gas phase coating method to obtain a hard carbon precursor; and calcining and carbonizing the hard carbon precursor in an inert atmosphere, and cooling to obtain the modified asphalt-based hard carbon negative electrode material. According to the preparation method disclosed by the invention, the pitch is pre-oxidized and then is subjected to vapor deposition coating, and the amorphous carbon coated pitch-based hard carbon improves the pore structure of the surface, so that active sites, in contact with electrolyte, of the material surface are reduced, and the first coulombic efficiency and reversible capacity of the battery are effectively improved.

The invention discloses a sunflower straw biochar preparation device and method, and relates to the technical field of biochar preparation, the sunflower straw biochar preparation device comprises a mechanical arm and a thermal insulation bin, the mechanical arm is used for conveying a preparation cylinder into the thermal insulation bin or taking the preparation cylinder out of the thermal insulation bin, and a heater is arranged on the inner side wall of the thermal insulation bin; a rotating plate is rotationally arranged at the bottom of the thermal insulation bin, a plurality of rotating clamping sets distributed in a circumferential array mode are arranged on the rotating plate and used for being quickly connected with the preparation cylinder, and a side sliding plate is arranged on the side of the thermal insulation bin in a sliding mode; by rotating the rotating plate, the preparation cylinders can approach the heater one by one so as to realize conversion between heating and cooling; according to the preparation device, the columnar straw bodies can be subjected to regional treatment by arranging a plurality of preparation cylinders, and each region is further subdivided by a partition plate, so that each columnar straw body can be uniformly heated, the whole process is high in automation degree, and the preparation effect is good.

The invention relates to a deacidification treatment process for flue gas containing high fluorine and chlorine, and belongs to the technical field of flue gas treatment. According to the process, the flue gas is treated by adopting dry deacidification, and a novel deacidification agent is prepared aiming at the characteristic that the flue gas contains a large amount of halogen and fluorine ions. Natural zeolite is subjected to modification treatment by adopting a sodium hydroxide solution, the activity of the zeolite is enhanced by roasting in a muffle furnace, and the zeolite and lime are well combined, so that efficient defluorination is realized. In addition, the particle size of the baking soda is refined through a grinding method, the specific surface area of the baking soda is remarkably increased, the contact area and the reaction rate with acid smoke are increased, a proper amount of polyethylene glycol is added, moisture on the surfaces of baking soda particles is adsorbed and fixed through the hygroscopicity and the film-forming property of the polyethylene glycol, agglomeration and hardening are prevented, and meanwhile protective films are formed on the surfaces of the baking soda particles. The stability and the dispersity are enhanced. The zeolite loaded with lime is combined with modified baking soda to synergistically remove halogen and fluorine ions in the acidic flue gas, so that efficient defluorination and dehalogenation are realized.

A catalytic cracking aid for improving the octane number of gasoline and a preparation method thereof. The catalytic cracking aid is composed of MFI structure molecular sieve, clay, pseudo-boehmite, phosphorus compound, binder, modified metal compound, etc. The catalytic cracking aid for improving the octane number of gasoline is obtained by the following preparation method: the MFI structure molecular sieve is pre-treated with alkali; before the pseudo-boehmite is acidified, the molecular sieve is added; after the acidified colloid is homogenized, it is directly spray-dried, roasted, and washed with water to obtain the catalytic cracking aid for improving the octane number of gasoline. The catalytic cracking aid disclosed in the present invention has a simple preparation process, a high solid content of the colloid slurry, and can be used in the catalytic cracking process to effectively improve the octane number of gasoline, with a small increase in liquefied gas and an increased propylene yield.

The invention provides a reinforcing steel bar corrosion resistant marine site polymer concrete and a preparation method thereof, and relates to the technical field of building concrete preparation. The reinforcing steel bar corrosion resistant marine site polymer concrete is prepared from the following components in percentage by mass: 20 to 30 percent of coarse aggregate, 10 to 20 percent of calcium nitrite, 3 to 5 percent of sodium carbonate, 3 to 5 percent of sodium sulfate, 0.6 to 1.0 percent of alcohol amine compound, 5 to 10 percent of zeolite molecular sieve, 3 to 5 percent of nanoscale silicon dioxide powder, 1 to 5 percent of additive and the balance of water. According to the invention, the coarse aggregate is added into the raw materials, the calcined hydrotalcite is small in particle size and large in specific surface area, and can be used as a seed crystal to accelerate the hydration process in the early stage, so that more hydration products and a more compact structure are generated, and meanwhile, the calcined hydrotalcite can be filled in pores of a matrix to improve the pore structure, a slurry-aggregate interface and the like; chloride ions and CO2 are prevented from entering the matrix, and the durability of the sea site polymer and the concrete thereof is improved.

The invention discloses a reinforcing steel bar sleeve grouting material for a high-strength micro-expansion fabricated concrete structure. The reinforcing steel bar sleeve grouting material is prepared from the following raw materials in parts by weight: 735 to 795 parts of cement, 15 to 85 parts of silica fume, 80 to 90 parts of lithium slag powder, 9 to 36 parts of magnesium slag powder, 500 to 800 parts of quartz sand, 100 to 400 parts of basalt sand, 9 to 12.6 parts of a water reducing agent, 0.9 to 4.5 parts of a retarder, 0.9 to 4.5 parts of a reinforcing agent, 0.6 to 1.2 parts of a de-foaming agent, 0.6 to 1.2 parts of a suspension stabilizer, 0.1 to 0.3 part of a plastic expanding agent and 45 to 72 parts of a UEA expanding agent. The grouting material disclosed by the invention has the advantages of high strength, micro-expansion, good fluidity, no bleeding, no segregation and the like, and meets the use requirements of an assembled concrete structure.

The present invention provides a kind of lignite for honeycomb activated carbon and its quality improvement and modification method, honeycomb activated carbon, the quality improvement and modification method of lignite for honeycomb activated carbon, comprising the following steps: taking lignite powder, adding an aqueous solution of sodium borohydride, mixing evenly, performing a reduction reaction, and obtaining reduced lignite; mixing the reduced lignite with a thermal stability regulator, 9,10-dihydrophenanthrene, and N,N-dimethylformamide evenly, performing a swelling treatment, and obtaining swollen lignite; mixing the swollen lignite with aniline evenly, stirring the reaction, and obtaining lignite for honeycomb activated carbon. The lignite obtained by the quality improvement and modification method of the present invention for honeycomb activated carbon is not easy to return to white, is not easy to crack after being made into honeycomb activated carbon, has good mechanical strength, and has good thermal stability.

The invention relates to the technical field of drinking water treatment, in particular to high-catalytic-activity biochar, a preparation method and application of the high-catalytic-activity biochar to removal of pesticides in drinking water. The preparation method comprises the following steps: 1) removing roots of fresh water hyacinth, cleaning, drying, crushing and sieving to obtain fine and uniform powder; (2) putting the obtained powder into a sodium hydroxide solution, stirring, standing to obtain a solid, washing to be neutral, drying, and adding into pure water together with magnesium chloride; drying the solid obtained by solid-liquid separation, pyrolyzing in a tubular furnace, and cooling to room temperature; the preparation method comprises the following steps: grinding and sieving the raw materials, adding the raw materials into ethanol to form a dispersion liquid, and adding 3-aminopropyltriethoxysilane to carry out a functionalization reaction; and filtering the dispersion liquid after the functionalization reaction, washing the obtained solid, and drying to obtain the functionalized magnesium-modified water hyacinth-based biochar. The prepared charcoal activated peroxymonosulfate can be used for efficiently removing organic pesticides in drinking water.

The invention discloses a reaction bonding silicon carbide ceramic membrane and a preparation method thereof, and belongs to the technical field of porous ceramics. The preparation method of the reaction binding silicon carbide ceramic membrane comprises the following steps: uniformly mixing first silicon carbide powder, first silicon powder and first titanium-silicon-iron alloy powder, adding an organic binding agent and a polyol plasticizer, and granulating and forming to prepare a support body green body; uniformly mixing second silicon carbide powder, second silicon powder, second titanium-silicon-iron alloy powder, a water-based polymer dispersant and water to obtain slurry, and coating the surface of the support body green body with the slurry to obtain a support body green body containing a film layer; and sintering the support body green body containing the membrane layer at 1200-1400 DEG C in a nitrogen-containing gas atmosphere to obtain the reaction bonding silicon carbide ceramic membrane. The reaction combined silicon carbide ceramic membrane prepared by the method has excellent thermal shock resistance.