42results about How to "Uniform and stable particle size" patented technology

The invention provides a preparation method of a bonding type stationary phase chiral chromatographic column. The method comprises the following steps: firstly preparing silica gel bonded with unsaturated double bond and filling into a chiral chromatographic column, then preparing a polysaccharide derivative compound bonded with unsaturated double bond, injecting the polysaccharide derivative compound into the chiral chromatographic column in a solution form to enable the polysaccharide derivative compound to be evenly adsorbed to the surface of the silica gel, and then injecting an initiator solution to the chiral chromatographic column, so that the unsaturated double bond of the silica gel and the unsaturated double bond of the polysaccharide derivative compound generate polymerization reaction to form a bonding type stationary phase. According to the preparation method disclosed by the invention, steps of adsorbing and bonding in conventional preparation methods are completed in the chromatographic column, so that the steps and the process are simplified; the preparation method has the characteristics of being simple, quick and high in efficiency; the stationary phase of the prepared chiral chromatographic column is uniform and can be applied to multiple strong-polarity mobile phases; the column efficiency is high and the separation effect is good.

The invention discloses a method for preparing potassium chloride from carnallite raw ore. The method comprises the following steps of generating low-sodium carnallite slurry in a first flotation device from carnallite raw ore slurry; feeding the low-sodium carnallite slurry into a first screening device to obtain a first oversize product and a first undersize product; feeding the first oversize product into a crushing device, and returning the crushed first oversize product to the first flotation device; containing crystallizer underflow and crystallizer overflow liquid are from the first screen underflow in a crystallizer; conveying the bottom flow of the crystallizer into a second screening device to obtain a second oversize product and a second undersize product, conveying the second oversize product into the crushing device, and conveying the second undersize product into a fourth concentrating device for producing potassium chloride; and generating crude potassium slurry in the second flotation device form the overflow liquid of the crystallizer, and feeding the crude potassium slurry into the fourth concentrating device for producing potassium chloride. According to the method, the low-sodium carnallite ore pulp is subjected to circulating screening-crushing treatment, so that the particle size of the first screen underflow is uniform and stable, the crystallizer overflow liquid is subjected to reverse flotation again, and the potassium resource is recycled.

The invention provides a preparation method of CuInS2 alloy quantum points. The method comprises the following steps of preparing In2S3 quantum points; providing inorganic indium salt, elemental sulfur, organic amine or organic phosphorus; mixing the inorganic indium salt, the elemental sulfur, the organic amine or the organic phosphorus; performing stirring in insert atmosphere, and performing degassing treatment to form a mixed solution; heating the mixed solution to 80 to 150 DEG C in the insert atmosphere; continuously heating the materials to 180 to 250 DEG C; performing preparation to obtain the In2S3 quantum points; preparing CuInS2 alloy quantum points; dissolving the In2S3 quantum points into a non-polar solvent; performing stirring treatment in the insert atmosphere to obtain an In2S3 quantum point solution; dissolving copper ion precursors into thiol; performing stirring treatment in the insert atmosphere; obtaining a Cu-thiol ligand solution; injecting the Cu-thiol ligand solution into the In2S3 quantum point solution at uniform speed to perform cation exchange; performing purification treatment; obtaining the CuInS2 alloy quantum points.

The invention belongs to the technical field of water purification and particularly relates to a preparation method of nanocellulose, the nanocellulose, a water purifying membrane and a preparation method of the water purifying membrane. The preparation method of the nanocellulose comprises steps as follows: raw material pretreatment; preparation of alpha cellulose and preparation of nanocellulose. The nanocellulose is prepared with the preparation method. The water purifying membrane comprises the nanocellulose. The preparation method of the water purifying membrane comprises steps as follows: preparation of a lignin base layer, preparation of a polyether sulfone ultrafiltration layer and preparation of the water purifying membrane, wherein the raw material lignin of the lignin base layer is a product separated in the preparation method of the nanocellulose. The preparation method adopts mild conditions, pollution emission is avoided, and the finally prepared nanocellulose meets requirement for preparation of the water purifying membrane. Further, the content of the nanocellulose in the water purifying membrane obtained with the provided preparation method of the water purifying membrane is high, the service life is longer and the water purifying effect is better.

The invention discloses a preparation method of a zeolite imidazole framework nanoparticle material loaded with zoledronic acid, which comprises the following steps: preparing an aqueous solution of 2-methylimidazole, and then adding Zn(NO 3 ) 2 Aqueous solution, continue to stir until the reaction system is white colloid, in the obtained zeolite imidazole framework-8 colloid, dropwise add zoledronic acid aqueous solution while stirring, continue to stir, centrifuge, and the white precipitate obtained after washing is the described Zeolite imidazole framework nanoparticle material loaded with zoledronic acid. The present invention uses a one-step method to synthesize the zeolite imidazole framework nanoparticle material (ZIF-8@ZA) loaded with zoledronic acid in the water system, and the zoledronic acid can be loaded into the ZIF-8@ZA without modifying the zoledronic acid. 8 nanometer particles, not only preserves the pharmacological activity of zoledronic acid itself, but also simplifies the process, simple operation and high production efficiency.

The invention discloses a novel nano pesticide for preventing and treating monochamus alternatus and pine wood nematodes. The novel nano pesticide is a nano pesticide preparation prepared by taking nano Cu-BTC as a carrier to load pesticide abamectin; the nano Cu-BTC serving as the carrier is uniform and stable in particle size and good in dispersity, and agglomeration is avoided; the interior ofthe nano Cu-BTC is of a porous structure, so that the nano Cu-BTC has a relatively large specific surface area, high drug loading capacity and a quite good sustained and controlled release effect. Theprepared nano pesticide preparation can penetrate through cell wall barriers of plants due to the nano size, and the pesticide is transported into barks and is used for preventing and treating monochamus alternatus and pine wood nematodes.

The invention discloses a molten steel casting residue treatment and recycling method which comprises the circular treatment steps of slaking, screening, magnetic separation and the like. The f-CaO in casting residue is slaked by vapor to accelerate the expansion and efflorescence of the casting residue, thereby solving the problem on the separation of the casting residue from a tank body and reducing dust nuisance. According to the method, a mixture of water spray casting residue and pyrolytic steel slag is used as the raw material, and the pyrolytic steel slag has the advantage of low f-CaO content, thereby ensuring that the f-CaO content of the final product can meet the requirements of cement and construction material industries; and a rod grinder treatment process is used, thereby achieving favorable grinding effect and ensuring that the product is uniform and stable in particle size. For the product disclosed by the invention, slag steel of which the grade is greater than 80% can be returned for steel making; purified steel shots and magnetic separation powder of which the grade is greater than 42% can be used for a sintering procedure; and steel tailings of which the iron content is smaller than 2% and the f-CaO content is smaller than 3% can be used for producing steel slag powder, steel slag cement, construction material products and road materials. The invention maximally recycles the metal material in the casting residue, realizes the zero discharge of industrial solid waste and ensures that the casting residue can be recycled 100% at a high added value.

The invention discloses a nano composite high-hygroscopicity material and a preparation method therefor. According to the nano composite high-hygroscopicity material and the preparation method therefor, silica sol is dispersed in an acrylic neutralizing solution for modification, SiO2 nanoparticles are produced in situ during cross-linking copolymerization of acrylic acid and an acrylamide monomer, and then, reactive compounding of SiO2 nanoparticles and a polyacrylic polymer is achieved; the prepared nano composite high-hygroscopicity material is prepared from a low-crosslinking-degree resinmatrix with high water absorption multiplying power and high water absorption rate and a nano composite high-crosslinking-degree surface layer, the water absorption multiplying power is increased under pressure, and finally, the high-hygroscopicity composite material is prepared; the dispersity is good; and meanwhile, microchannels are formed between inorganic nanoparticles and a polymer, the volatilized overflow of internal water molecules is facilitated, the drying effect of the high-hygroscopicity material is better, the drying time is shortened obviously, the production efficiency is increased, the production cost is reduced, and thus, the nano composite high-hygroscopicity material is suitable for being produced on a large scale and has an extensive application prospect.

The present invention provides a bonding type stationary phase chiral chromatographic column preparation method, which comprises: preparing a silica gel bonded with the unsaturated double bond, loading the silica gel into a chiral chromatographic column, preparing a polysaccharide derivative bonded with the unsaturated double bond, injecting the polysaccharide derivative into the chiral chromatographic column in a solution form so as to make the polysaccharide derivative be uniformly adsorbed on the silica gel surface, and injecting an initiator solution into the chiral chromatographic column, such that the unsaturated double bond of the silica gel and the unsaturated double bond of the polysaccharide derivative are subjected to a polymerization reaction so as to form the bonding type stationary phase. According to the preparation method of the present invention, the adsorption step and the bonding step in the conventional preparation method are completed in the chromatographic column, such that the steps and the process are simplified, characteristics of simpleness, rapidness and high efficiency are provided, the prepared chiral chromatographic column stationary phase is uniform, the bonding type stationary phase chiral chromatographic column can be used for a variety of strong polar mobile phases, the column efficiency is high, and the separation effect is good.