34results about How to "Obvious technological advantages" patented technology

The invention relates to a lignite separation process, and belongs to coal washing methods. The lignite separation process comprises the following steps of: desliming broken lignite; putting obtained screen underflows into size mixing equipment to perform size mixing; outputting obtained waste rocks, crushing obtained middling coal in a crusher, putting the crushed middling coal into an ore grinding machine, putting a product after ore grinding into the size mixing equipment to perform size mixing, putting obtained cleaned coal into a sieve bend and a grading and dewatering screen for dewatering and grading, and putting screening water into a cleaned coal thickener; outputting lumpish cleaned coal obtained by the grading and dewatering screen, and putting fine cleaned coal into a centrifuge for dewatering again; outputting low-water fine cleaned coal obtained by the centrifuge, and putting centrifugate into the cleaned coal thickener; putting foams obtained through reverse flotation into a coal slime pressure filter for pressure filtering, and putting underflow into the cleaned coal thickener for thickening; putting filtrate obtained by the coal slime press filter into a circulating pool, and outputting filter cakes as coal slimes; putting overflow of the thickener into the circulating pool, and putting the underflow into a cleaned coal pressure filter for pressure filtering; and putting the filtrate into the circulating pool. The lignite separation process integrates desliming, jigging, dewatering, regrinding of the middling coal, reverse floating and coal slime water purifying, and is concise, low in investment and operation cost, and high in economic benefit.

The invention belongs to the technical field of antibiotic drug synthesis, in particular to a synthesis methodof cefcapene pivoxil hydrochloride. The invention is mainly used for process improvement and optimization of cefcapene pivoxil, and the advantage of the synthesis process of cefcapene pivoxil are obvious; new catalytic agents are used, such as phenol, boric acid and other reagents, thereby improving the product quality, increasing the yield, simplifying the operating steps and realizing greater productivity effect and social effect.

The invention discloses a preparation method of silica sol, comprising the following steps: reacting with NaHCO3 or NH4HCO3 and sodium silicate Na2O.nSiO2 as raw materials to obtain hydrated SiO2 sediment; filtering to remove filtrate; washing, peptizing, grain-increasing and concentrating filter cake to obtain the silica sol. In the preparation method, the filtrate mainly contains Na2CO3; when NaHCO3 is used as the raw material, a small amount of NaHCO3 is contained; and when NH4HCO3 is used as the raw material, NH3.H2O and a small amount of NH4HCO3 are contained. As the main ingredient of the filtrate can be regenerated into reaction materials by different processing modes, the preparation method disclosed by the invention has the characteristic of cycle use, thereby reducing the production cost of the silica sol, the resource consumption, the emission and the environment damage and avoiding the problems that a great amount of inorganic acid is consumed so as to cause the environmental pollution in the prior art, and the like.

The invention provides precipitated calcium carbonate seed crystal containing an aragonite crystalline phase and a preparation method thereof. The precipitated calcium carbonate seed crystal containing the aragonite crystalline phase is characterized in that weight content of an aragonite phase is greater than 80%, and the particle size of the seed crystal D50 is greater than or equal to 0.1 [mu]m and less than or equal to 0.2 [mu]m. The precipitated calcium carbonate seed crystal can be used for preparing the precipitated calcium carbonate containing a metastable crystalline phase, and also can be directly used in the corresponding industrial field. The method has the advantages of low cost and obvious process advantage, and the technology bias that strontium salts such as strontium chloride cannot be used to prepare the precipitated calcium carbonate seed crystal containing the aragonite crystalline phase in the prior art is overcome. The provided technology has wide application prospect based on the above advantages.

A low-cost technology for preparing a double electrode layer thin film transistor in the present invention comprises: a). substrate and electrode material selection; b). source and drain electrode patterning (carving); c). sample cleaning; d). active layer preparation; e). gate substrate and electrode material selection and gate patterning (cutting); f). gate dielectric layer preparation; and g).flip-chip bonding. According to the technology for preparing the double electrode layer thin film transistor in the present invention, a simple low-cost method for preparing a double electrode layer thin film transistor is provided, and a "carving, cutting, and flip-chip bonding (CCFB for short)" technology is developed. The technology has advantages of low costs, timesaving, environmental protection and easy large-scale production, and can be used for various substrates, for example, rigid substrates such as glass, silicon slices, mica and the like, and flexible substrate such as plastic, paper and the like. The excellent technology advantages and device performance indicate that, the technology has an extremely high application promotion prospect.

A method for assembling a low-energy explosive foil detonator, the detonating unit includes a ceramic substrate, a composite metal film layer, an insulating layer, an upper electrode Ti/W/Ti/Cu/Au, a Schottky secondary tube or a high-pressure tube and an accelerating chamber , is characterized in that comprising the steps of the following sequence: (1) PCB board grinding, cleaning; (2) using insulating glue to bond the processed substrate to a suitable position on the PCB board and curing; (3) using conductive glue to The Schottky diode is reversely bonded on the upper electrode Ti/W/Ti/Cu/Au or the high-voltage tube is bonded on the upper electrode Ti/W/Ti/Cu/Au with conductive adhesive and cured; (4) use Aluminum strip wedge welding connects the Schottky diode and PCB pad; (5) Use copper strip manual welding to connect the upper electrode and PCB pad. The method adopts thin-film technology, which has high precision and high integration, and the prepared detonation system is smaller in size, safer and more reliable; and the impedance of the detonation circuit is reduced, and the ignition energy of the detonation system is low; moreover, independent components can be reworked many times Realize multiple uses of exploding foil experiment samples.

The invention discloses a solid-state electronic switch with characteristic of conversion from a normally-open state to a normally-closed state and a preparation method thereof. The solid-state electronic switch consists of a substrate, a control bridge, an insulating layer, a metal interconnection unit, a controlled bridge, a passivation layer, a pair of control electrode welding pads and a pair of controlled electrode welding pads. The control bridge is connected to a control circuit by the pair of control electrode welding pads, thereby receiving a control signal from the control circuit; and the controlled bridge is connected to a controlled circuit by the pair of controlled electrode welding pads. According to the invention, the solid-state electronic switch only consumes the electric energy at the moment of state conversion and does not consume electric energy in states of connection maintaining and disconnection, so that the switch has the bistable state characteristic; bidirectional conduction can be realized and no movable component is contained, so that the switch can work in a severe environment; the switch has the excellent anti-statistic and anti-electromagnetic interface characteristics; on the basis of the semiconductor technology of the integrated circuit, the switch has the high compatibility with the semiconductor technology of the integrated circuit; and the switch can be used as the short-circuit safety switch of an electric explosive device.

The invention discloses a new process for synthesizing 1-hydroxycyclohexanecarboxylic acid and an application. During the synthesis of the 1-hydroxycyclohexanecarboxylic acid, an anhydrous system is adopted. According to the process, due to an anhydrous reaction processing technology, a reaction enviroment is improved to the maximum, the progress of a main reaction is improved, adverse factors toreactions caused by a solid-liquid reaction are solved, the reaction yield is increased, and the aftertreatment of salt-bearing compounds becomes more convenient. By using the new process disclosed bythe invention, the yield of the 1-hydroxycyclohexanecarboxylic acid can reach 87% or more, the purity of the 1-hydroxycyclohexanecarboxylic acid can reach 97% or more, the purity of ammonium chloridecan reach 99% or more, and thus, the ammonium chloride can be sold directly as firsts of byproducts; the total yield of spirodiclofen prepared by using the 1-hydroxycyclohexanecarboxylic acid can reach 64% or more. Compared with the traditional processes, the process and the application have the advantages that the whole effect is greatly improved, and the social and economic benefits are huge.

The invention relates to a microcrystal rotating wheel zeolite molecular sieve for efficiently removing VOCs and a preparation method of the microcrystal rotating wheel zeolite molecular sieve, and belongs to the technical field of VOCs removal treatment. The microcrystal rotating wheel zeolite molecular sieve comprises, in percentage by mass, 25%-35% of a microcrystal material, 30%-50% of a natural zeolite material and 20%-30% of a mud making material. The molecular sieve comprises an adsorption zone, a regeneration zone and a cooling zone, and the technical problems that in the prior art, thiophene removal is not ideal, adsorbent blockage is easily caused, and catalyst poisoning is easily caused are solved.

The invention discloses a lip-type seal ring framework material for a rotary shaft, as well as a preparation method and an application of the lip-type seal ring framework material, and belongs to the field of rubber-plastic seal. The lip-type packing framework material for the rotary shaft is formed by compounding a chemigum system, an epoxy resin system and an aramid pulp system. The preparation method comprises the steps as follows: pre-processing the aramid pulp system; carrying out glue mixing to the chemigum system, the epoxy resin system and the pre-processed aramid pulp on an open type mixing machine, so as to obtain the lip-type packing framework material for the rotary shaft. The lip-type packing framework material subjected to extruding and the semi-finished product of lip-type glue are subjected to mould pressing and vulcanizing, so as to obtain the lip-type sealing ring for the rotary shaft. Test results show that the lip-type seal ring disclosed by the invention is simple in production process, proper in difficulty at installation, and high in capacity of keeping the sealing force of an external circle.

The invention relates to a jewel-like crystal based on animal skeletons and a preparation method of the jewel-like crystal. The preparation method comprises the following steps of burning animal skeletons into powder, then adding the powder into water, uniformly mixing, then adding an organic polymer monomer, a cross-linking agent, an initiator and a catalyst, and fully stirring to form slurry, injecting the slurry into a mold, enabling the organic polymer monomer to react, crosslink and polymerize to form polymer gel, and bonding and curing the particles in situ to form a green body, and carrying out high-temperature and high-pressure plasma-assisted sintering on the green body to obtain the jewel-like crystal. The technical means of material synthesis and crystal reconstruction are adopted, and the natural dead pet skeletons are subjected to atom recombination to form jewel-like crystals containing elements such as carbon, calcium, phosphorus, magnesium and oxygen; on the basis of the traditional hot pressing sintering technology, the plasma auxiliary sintering technology is combined, multi-field coupling of a thermal field, a force field and an electric field is achieved, energy needed by reaction is reduced, and the reaction rate and the production efficiency are improved.

The invention discloses a preparation method of nano SiO2. The preparation method is characterized by taking soluble silicate M2O.nSiO2 and NH4HCO3 as raw materials to react to obtain hydrate SiO2 through precipitation, separating out filtrate through filtration, then washing the filter cake, displacing the filter cake with an organic solvent and drying the product to obtain the nano SiO2 product, wherein the filtrate mainly contains carbonate M2CO3 and NH3 and also contains little NH4HCO3; and M is an alkali metal Na or K. The preparation method has the following beneficial effects: the filtrate mainly contains M2CO3 and NH3 which can generate MHCO3 and NH4HCO3 through reaction with CO2, and MHCO3 can react with M2O.nSiO2 to obtain the hydrate SiO2 through precipitation, i.e. several components in the filtrate can regenerate the required reaction raw materials through reaction with CO2, so the materials can be recycled, thus the preparation cost of precipitated SiO2 is reduced, simultaneously fewer resources are consumed and emission is reduced.