33results about How to "Moderate bulk density" patented technology

The invention discloses preparation methods for a macroporous alumina carrier and a hydrodemetallization catalyst. The preparation method for the macroporous alumina carrier includes the following steps: (1) dry pseudoboehmite gel powder is hydrothermally processed under high pressure; (2) the dry pseudoboehmite gel powder obtained in step 1 is kneaded into a plastic, and pore-expanding agent is added in step 1 or step 2; (3) the plastic obtained in step 2 is shaped, the shaped material is dried and baked, and thereby the macroporous alumina carrier is obtained. The impregnation method is adopted to prepare the hydrodemetallization catalyst. The hydrodemetallization catalyst prepared by the method has large pore volume and pore diameter, centrally distributed pores, moderate mechanical strength and high activity and activity stability.

The invention provides a titaniferous solid catalyst component used for vinyl polymerization and a preparation method. The titaniferous solid catalyst component is prepared according to the following three continuous steps: 1) under the existence of halogen or halogen-containing compound, reacting metal magnesium with alcohol, thereby preparing a magnesium-containing solid; 2) utilizing an organic metallic compound or a mixture of the organic metallic compound and an electron donor compound to process the magnesium-containing solid, thereby obtaining a magnesium-containing catalyst carrier; and 3) under the existence of an inert organic solvent, utilizing a compound of transition metal titanium to process the magnesium-containing catalyst carrier, and then utilizing a halogenated alcohol compound to process, thereby obtaining the catalyst component. The preparation method has the characteristics of simple process, convenience in operation, low investment in industrial equipment, easiness in controlling the product quality, and the like. The titaniferous solid catalyst component has the characteristics of high vinyl polymerization catalytic activity, high copolymerizing capacity, high stacking density of polymer, less subdivision, and the like. The titaniferous solid catalyst component is suitable for slurry polymerization or gas-phase polymerization of vinyl, and is especiallysuitable for a gas-phase fluidized bed polymerization process for the vinyl, in which the catalyst is fed in a slurry form.

The invention provides polypropylene for selective laser sintering, which is spherical and/or sphere-like granules having a degree of sphericity of 0.6-1.0, sizes of 10-100mu m and grain distribution D10 of 10-25mu m, D50 being 30-60mu m and D90 being 70-95mu m. The invention further provides a method for preparing the polypropylene powder, which comprises the following steps: mixing a polypropylene material with an organic solvent for dissolving the polypropylene material, heating under a stirring state to a target heating temperature, and continuing stirring at constant temperature to form a polypropylene solution; (2) quenching the polypropylene solution to the target quenching temperature, standing at a constant temperature until precipitate is generated in the solution; and (3) separating the precipitate, washing and drying to obtain the polypropylene powder.

The invention discloses shampoo containing hyaluronic acid. The hyaluronic acid contained in the shampoo disclosed in the invention is high in yield, good in transmittance, low in protein content, high in glucuronic acid content, easy to dissolve and good in moisturizing effect, the prepared shampoo containing hyaluronic acid is good in stability, good in decontamination effect, free of toxic side effect, mild and free of stimulation to skin, good in moisturizing and hair protection effects while being used for cleaning hairs and is capable of protecting the hair from damage.

The invention discloses a preparation method of a high-temperature structure and function integrated B4C (boron carbide)-enhanced Al (aluminum)-based neutron absorbing material, and belongs to the technical field of neutron absorbing materials and Al-based composite materials. The preparation method comprises the following steps of (1) pre-oxidizing the surface of superfine aluminum powder to increase the content of aluminum oxide; (2) uniformly mixing the superfine aluminum powder and micrometer-level B4C particles; (3) performing compression moulding on the powder, and sintering a pressed compact; (4) forging the sintered billet, extruding or rolling, so as to obtain a high-temperature structure and function integrated B4C/Al neutron absorbing profile or sheet. The preparation method hasthe advantages that in the final material, the aluminum oxide is distributed into crystal interfaces of material, and the pining is performed, so as to obviously enhance the high-temperature propertyof the material; by adding the B4C particles, the room-temperature and medium-temperature strengths can be further improved, and the neutron absorbing function is realized; the technology is simple and convenient and is easy to implement; the strength of the material at the room temperature to high temperature are higher than the actual use requirements, and the material can be applied to the storage and transportation of the spent fuel.

The invention provides a gunning mix for a tapping hole of a converter. The gunning mix comprises the following components in parts by weight: 65-75 parts of magnesium-containing waste; 20 to 30 partsby weight of fused skin sand; 1.5 to 2.5 parts by weight of phosphate; 1-2 parts by weight of slaked lime; 0.25 to 0.75 part by weight of silica fume; and 0.3-0.7 part by weight of a sintering agent,wherein the content of MgO in the magnesium-containing waste is not lower than 80%. Compared with the prior art, the gunning material has the advantages that the magnesium-containing waste is used asaggregate, the fused skin sand is added to promote sintering of a matrix phase of the gunning material, phosphate is used as a binding agent to enable the gunning material to have high strength at medium and low temperatures, and meanwhile silica fume is added into the gunning material to fill part of gaps of the matrix and compact the gunning material; and the additive can react with MgO and CaOat a high temperature to generate high-temperature phases such as forsterite or calcium forsterite, so that the slag corrosion resistance of the gunning material is improved, and the gunning materialhas the advantages of low cost, moderate volume density, high sintering speed, moderate sintering strength, easiness in drilling and long service life.

The invention provides a casting material for hanging bricks for partition walls of heating furnaces, and the casting material is prepared from the following raw materials in parts by weight: 20-50 parts of light mullite, 30-60 parts of mullite, 1-20 parts of cement, 1-10 parts of an expansion agent and 0.1-0.2 part of a water reducing agent. The casting material has the following beneficial effects: by using the mullite as a main raw material and adding a reasonable expansion material, a prepared hanging brick product has the characteristics of moderate volume density, excellent thermal shockstability, good volume stability, long service life and the like, and the service life can reach more than one year.

The invention relates to a blast furnace air duct castable and a preparation method thereof, and belongs to the field of inorganic non-metal materials. The blast furnace air duct castable is preparedby adding 5 to 9% by mass of Al2O3 micro powder, 0-4% by mass of silicon micro powder, 2-5% by mass of Secar71 cement binder and a small amount of water reducing agent into 40% by mass of 5-1mm titanium calcium aluminate hollow spheres, 0-30% by mass of 1-0mm titanium calcium aluminate hollow spheres, 0-30% by mass of 1-0mm titanium calcium aluminate, 10 to 16% by mass of 200-mesh titanium calciumaluminate fine powder and 0 to 6% by mass of 200-mesh corundum fine powder for premixing, adding 3-5% by mass of water, stirring, and casting for molding to obtain the titanium calcium aluminate hollow sphere blast furnace air duct castable. The castable has the advantages of good fluidity, compact structure, high strength, good wear resistance, low thermal conductivity, good heat preservation effect, and the like, and can be used to replace the existing blast furnace air duct castable.

The embodiment of the invention discloses an external electron donor of a catalyst for propylene polymerization. The external electron donor comprises siloxane, glycerol fatty acid ester and polyglycerol fatty acid ester, wherein the molar ratio of the siloxane to the glycerin fatty acid ester to the polyglycerol fatty acid ester is (0.01-0.8):(0.09-0.9):(0.09-0.9). According to the invention, a catalyst system comprising the external electron donor which is the mixture of the siloxane, the glycerin fatty acid ester and the polyglycerol fatty acid ester is a high-efficiency propylene polymerization catalyst, and the polymerization activity is high. The glycerin fatty acid ester and the polyglycerol fatty acid ester containing polar groups are selected as external electron donor components,and the problem of activity advancing caused by ethers to catalytic polymerization is successfully solved. The advantages are as the follows that a polymerization process is stable, static fluctuation does not occur easily, the polymerization product is not agglomerated easily and is not easily hung on a wall, and the like, so that long-term stable operation of polymerization production is ensured, and meanwhile, the amount of the obtained polymer fine powder is small, the bulk density is moderate, and the particle size distribution of particles is reasonable. The catalyst system is wide in application range and is suitable for propylene polymerization in various processes.

The invention provides a high-strength magnesium aluminum silicate proppant and a preparation method thereof. The preparation method comprises the following steps: respectively drying, crushing and roasting a raw material containing serpentine minerals, fly ash and coal gangue to obtain powder of the three materials; mixing and grinding the powder of the three materials and an auxiliary agent to obtain mixed material powder; granulating the mixed material powder to obtain a spherical granular green body; and drying and sintering the spherical granular green body to obtain the high-strength magnesium aluminum silicate proppant. The diameter of the high-strength magnesium aluminum silicate proppant ranges from 106 microns to 3350 microns, the sphericity and the roundness are not lower than 0.9, the volume density is 1.3-1.8 g/cm<3>, and the breakage rate under the closing pressure of 86 MPa to 103 MPa is smaller than or equal to 9%. The high-strength petroleum fracturing magnesium aluminum silicate proppant is produced by taking the rock, the barren rock and the tailings which mainly contain serpentine as raw materials, so that resource utilization of various solid wastes is realized.

The invention relates to a MgO-CePO4 material and a preparation method thereof. The technical solution is that the method comprises the following steps: firstly mixing 50-70 wt% of sintered magnesite,20-40 wt% of magnesium hydroxide, 5-10 wt% of cerous phosphate and 1-10 wt% of aluminate, performing uniform stirring, and performing compression moulding; and performing natural drying for 20-24 h,performing drying at 110-200 DEG C for 8-24 h, performing firing at 1300-1600 DEG C, performing heat preservation for 3-6 h, and performing cooling to obtain the MgO-CePO4 material. According to the method provided by the invention, the MgO-CePO4 material prepared by the method has thermal-insulating properties, mechanical properties and erosion resistance, has the characteristics of good thermalresistance performance, a moderate bulk density, moderate strength, low thermal conductivity and strong anti-erosion ability, and can meet the requirements of saving energy and reducing consumption ofindustrial equipment.

The invention relates to a phosphate tailing-based magnesium-calcium particle and a preparation method thereof. According to the technical scheme, the method comprises the following steps: firstly, putting a phosphate tailing powder into a charging basket of granulation equipment, starting the granulation equipment, then adding water which is 12-32wt% of the phosphate tailing powder into the charging basket, and performing granulation; after the phosphate tailing powder in the charging basket is completely converted into particles, stopping the granulation, taking out particles, and performing standing and drying; and then in a heating furnace, preserving heat at 1500-1700 DEG C for 1-5 hours, and performing cooling to obtain the phosphate tailing-based magnesium-calcium particle. The particle size of the phosphate tailing powder is 1-200 [mu]m; and in the phosphate tailing powder, the content of P2O5 is not more than 2wt%, the content of MgO is not less than 15wt%, and the content of CaO is not less than 25wt%. The method is simple in process, low in cost, environmentally friendly and high in phosphorus tailing recycling degree, and the prepared product is good in hydration resistance, low in phosphorus content, high in porosity, moderate in volume density and high in alkaline slag erosion resistance, has heat insulation performance and fire resistance at the same time, facilitates energy conservation and consumption reduction and meets the requirement for light weight of materials.