31results about How to "Dense pore structure" patented technology

The invention relates to efficient expansion clinker for cement concrete, a preparation method of the efficient expansion clinker and application of the efficient expansion clinker. The efficient expansion clinker is composed of, by weight, 30-60wt% of f-CaO, 5-40wt% of Fe2O3, 3-10wt% of C2S, 2-10wt% of C4AF, 3-15wt% of SiO2, 3-12wt% of Fe and 1-8wt% of C4A3S. The preparation method of the efficient expansion clinker includes: grinding 60-80wt% of limestone, 15-30wt% of pyrite cinders and 5-10wt% of rice husk ash, and well mixing to obtain raw materials; calcining the raw materials for 30-120min at the temperature of 1100-1350 DEG C to obtain the efficient expansion clinker. The expansion clinker can be mixed with dispersive carriers (such as blast furnace slag and copper slag) to form an efficient expanding agent for cement concrete. The expansion clinker and the expanding agent integrate three expanding sources including calcium hydroxide, ferric hydroxide and ettringite and are greatly promoted in expanding performance as compared with an ettringite type expanding agent with a single expanding source; due to a hydraulic binder component, later-stage mechanical properties of the cement concrete can be enhanced to some extent.

The invention belongs to the technical field of photocatalytic application of new materials, and particularly relates to a porous covalent triazine framework hollow microsphere as well as a preparation method and application thereof, a hard template stepwise polycondensation method is adopted to prepare the porous covalent triazine framework hollow microsphere with stable structure, low collapse rate and independent hollow structure, the porous covalent triazine framework hollow microsphere has excellent photocatalytic hydrogen production performance when being applied to visible light catalytic hydrogen production, thereby solving the technical problems that the covalent triazine framework hollow microsphere is not an independent hollow structure and the hydrogen production rate is poor in the prior art.

The invention discloses a preparation method for a nitrite intercalation hydrotalcite material modified reinforcing steel bar epoxy resin coating. The preparation method is characterized by comprisingthe following steps: adding a nitrite intercalation hydrotalcite material and silane into a silane organic mixed solution at a certain ratio, after water bath magnetic stirring is subjected to separation processing, washing with the mixed solution of ethyl alcohol and deionized water until pH (Potential of Hydrogen) is neutral, and carrying out vacuum drying to obtain a drying object; grinding the drying object to obtain fine powder, adding the fine powder into normal butanol organic solvent, carrying out ultrasonic dispersion to prepare organic solvent dispersion object solution; adding epoxy resin into the organic solvent dispersion object solution to carry out ultrasonic dispersion; adding a polyamide curing agent, carrying out even dispersion, and carrying out vacuum drying. Accordingto the preparation method, the pore structure of the epoxy resin can be compact, and the permeation intrusion of chloridions is hindered to avoid the corrosion of chloridions on reinforcing steel bar. Therefore, the coating material has multifunctionality and intellectuality, and the corrosive protection ability of the epoxy resin coating for the reinforcing steel bar is greatly improved.

The invention discloses a preparation method of a catalyst for oxidative hydrogenation of propane. The method comprises the following steps: grinding waste residual oil desulfurization catalysts into powder, adding a strong inorganic acid into the powder, filtering, adding an organic acid into the filtrate, then adding pseudo-boehmite, stirring the solution and heating at the same time until the solution is totally evaporated so as to obtain a solid substance, and then subjecting the solid substance to processes of drying, burning, and forming so as to obtain the catalyst for oxidative hydrogenation of propane. The preparation method fully utilizes the waste residual oil hydro-desulfurization catalysts, improves the resource utilization rate, and greatly reduces the cost; furthermore, the obtained catalyst has a large specific surface area, the active metal is highly dispersed on the catalyst surface, thus the utilization rate of active metal is improved, so the catalytic activity and selectivity of the catalyst are both improved.

The invention provides rice hull ash, a preparation method of the rice hull ash, a rice hull ash geopolymer and a preparation method of the rice hull ash geopolymer. The preparation method of the ricehull ash comprises the following steps: soaking rice hulls in an acid solution; taking out the rice husks, washing the rice husks to be neutral, drying the rice husks, and calcining the rice husks incalcining equipment at the temperature of 400-900 DEG C for 0.5-3 hours to obtain the rice husk ash. The invention discloses the preparation method of rice hull ash, K and other impurities hinderingrice hull combustion are removed through soaking treatment in an acid solution, the specific surface area of the rice hull ash is increased, the specific surface area is larger, the surface energy islarger, more active SiO2 is exposed, the volcanic ash activity of the rice hull ash is remarkably improved, and the content of silicon dioxide in the rice hull is remarkably increased and can reach 99.5% or above to the maximum. The rice husks are subjected to high-temperature calcination treatment, so that the content of crystalline silicon dioxide can be obviously reduced, the generation of amorphous silicon dioxide is promoted, the chemical activity is improved, and meanwhile, residual carbon is reduced.

The invention discloses an anti-scald domestic ceramic product and a preparation method thereof. The anti-scald domestic ceramic product is prepared from the following raw materials in parts by weight: 30-37 parts of albite, 22-26 parts of calcite, 40-50 parts of aluminum bentonite, 5-7 parts of aluminum oxide, 12-15 parts of quartz, 8-11 parts of wollastonite whiskers, 14-17 parts of aluminum silicate, 5-7 parts of sodium silicate, 1.2-1.6 parts of a water reducing agent, 2.4-3.4 parts of a foaming agent, 1.4-1.7 parts of a foam stabilizer and 3-4 parts of a dispersing agent. The anti-scald domestic ceramic product is low in heat conductivity coefficient and good in anti-scald effect; the product is small in thermal expansion coefficient, good in heat resistance, high in breaking strength, good in mechanical property and long in service life; the water absorption is low; in addition, the anti-scald domestic ceramic product provided by the invention has a compact pore structure inside,and is light in weight, good in heat insulation performance, good in anti-scald effect and good in comprehensive performance.

The invention belongs to the technical field of chemical industry production, and particularly relates to a method for preparing a carbon molecular sieve based on petroleum coke. The preparation method includes the following steps of: mixing and grinding petroleum coke and nano-silica, carrying out carbonization, excitation and carbon deposit to obtain the carbon molecular sieve. According to theinvention, nano-silica is doped in petroleum coke and formed of silicon carbide filled in the petroleum coke pore structure during high temperature treatment, so that the obtained carbon molecular sieve has higher strength; meanwhile, the filling of the nano silica can also generate carbon monoxide gas in the process of being reduced by carbon, and can reduce the pore shrinkage of the petroleum coke caused by polycondensation during the releasing process, thereby ensuring that the obtained carbon molecular sieve has a more dense pore structure.

The invention relates to a preparation method of a hydrophobic porous carbon material, which belongs to the field of carbon materials, and is characterized by comprising the following steps: pre-emulsifying raw materials organic silicon, styrene, acrylate, an emulsifier and deionized water, dropwisely adding potassium peroxodisulfate to perform emulsion polymerization to obtain styrene-acrylic latex SSAL, and blending the SSAL with an oxalic acid solution to obtain a resin matrix PSO; and carbonizing PSO at high temperature to obtain a hydrophobic porous carbon material. According to the method, oxalic acid is used as an activating agent, and a specific adding step is matched, so that the pore-forming effect is guaranteed, and meanwhile, energy waste and waste liquid generation are avoided.

The invention provides a cement-based modified composite material. The cement-based modified composite material comprises the following components in parts by weight: 300-550 parts of Portland cement;200-400 parts of slag; 50-500 parts of incineration fly ash; 1-7 parts of a polycarboxylate superplasticizer; 0.5-1 part of a water-absorbing polymer; and 192-580 parts of water; according to the cement-based modified composite material, Portland cement, slag and incineration fly ash are used as main components and cooperate with a water-absorbing polymer and a polycarboxylate superplasticizer, so that heavy metal ions are effectively absorbed into the water-absorbing polymer and retained in the water-absorbing polymer, the curing effect is achieved, and meanwhile, the leaching process of theheavy metal ions is slowed down; the precipitation concentration of heavy metals in the composite material is greatly reduced by the water-absorbing polymer, and the performance of the molecular structure of the cement-based modified composite material is improved, so that the cement-based modified composite material reaches the use standard of building materials.

The invention discloses a method for enriching micro sliver irons by utilizing melamine modified urea resin. The method is characterized in that melamine modified urea resin is taken as an adsorbent; and a constant-temperature oscillation method is adopted to adsorb silver ions in a silver ion containing solution. According to the method disclosed by the invention, melamine modified urea resin raw material is cheap and easily available; the preparation method is simple; selectivity on sliver ions is high; melamine modified urea resin is utilized to adsorb silver irons and 110 mAg of radioactive isotope thereof in a water body, so that 110 mAg field measurement needs of efflux of a nuclear power station can be met, especially, quick field measurement needs under an emergency situation are met; and meanwhile, a sample treated on site is convenient to transport, and an application prospect is wide.

The invention provides a soil conditioner, and a preparation method and a use method thereof, and relates to the technical field of soil improvement. According to the soil conditioner, glass and food waste are sintered and mixed to prepare a material with a compact porous structure, and when the soil conditioner is applied to soil, not only can moisture be effectively locked, but also the air permeability of the soil can be enhanced, so that the problem of soil hardening is effectively solved. In addition, the invention further provides the preparation method of the soil conditioner, the soil conditioner with the good improvement effect can be simply and rapidly prepared through the method, operability is high, intelligent automatic production is easy to achieve, and practicability is high. Besides, the invention further provides the use method of the soil conditioner, namely, the soil conditioner and an organic fertilizer are mixed and applied according to the proportion of (0.3-0.8): 1, so that the utilization rate of the soil conditioner can be increased, the situation of incompatibility of the mixing proportion can be avoided, and the problem of soil hardening can be better solved.

The invention discloses anti-cracking alkali slag recycled concrete and a preparation method thereof. According to the invention, sodium sulfate, sodium silicate and cement are used as composite excitants, such that advantages of cracking resistance, good strength, and the like are provided. The recycled coarse aggregate with the saturated surface dry can return water to achieve an internal curing effect, so that the shrinkage of the material is reduced, and the anti-cracking performance is improved; magnesium oxide is adopted to compensate shrinkage of the alkali slag concrete, and cracking is further reduced; by adopting the PTB emulsion, the development of micro-cracks in the material can be inhibited, and the waterproof performance and the workability are relatively good; and the used slag and recycled aggregate are wastes which are recycled, so that garbage landfill can be reduced, and environmental management and protection are facilitated. The anti-cracking alkali slag recycled concrete has good economic, social and environment-friendly benefits and is suitable for large-scale popularization and application.