42results about How to "High recovery rate" patented technology

The invention relates to a method to extract a natural vitamin E, a phytosterin, and a fatty acid methyl ester by the enzyme catalysis and the molecular distillation, which is characterized in that a triglyceride in a distillate which is deodorized from a vegetable oil is hydrolyzed into a fatty acid through a lipase, a methanol is catalyzed by the lipase and the fatty acid is esterified and generated into a fatty acid methyl ester, and the natural vitamin E and the phytosterin are produced when the methanol and the fatty acid methyl ester are processed by filtering, desolventizing, freezing and removing the phytosterin, and removing the fatty acid methyl ester through the secondary molecular distillation. The the extraction method of natural vitamin E, phytosterin, and fatty acid methyl este, compared with the prior art, has the advantages of adopting the process that the oil is catalyzed and hydrolyzed first and then the enzyme catalyzes the fat to be esterified and to be processed by the secondary molecular distillation, no producing wastewater, shortening the esterification time, increasing the natural vitamin E content, deploying the secondary freezing and crystallization to remove the phytosterin with high recovery rate of phytosterin, and beneficially increasing the purity of the vitamin E.

The invention relates to a mineral separation method for recycling iron, rare earth, fluorite and niobium from iron tailings of associated multi-metal minerals, and belongs to the fields of mineral process engineering and comprehensive recycling of resources. The mineral separation method for recycling iron, rare earth, fluorite and niobium from iron tailings of associated multi-metal minerals comprises the following steps: carrying out low intensity magnetic separation and high intensity magnetic separation pre-concentration by taking bayan obo tailings as raw materials, then carrying out fluid bed roasting on obtained pre-concentrated concentrates, and carrying out low intensity magnetic separation operation on roasted minerals obtained by roasting so as to obtain weak-magnetism concentrates and rare-earth-containing weak-magnetism tailings; and carrying out rare earth flotation operation on the weak-magnetism tailings to obtain rare earth flotation concentrates and rare earth flotation tailings finally, then carrying out acid leaching process on the rare earth flotation tailings to obtain niobium-enriched slag and acid pickling tailings, and meanwhile, carrying out fluorite flotation operation on pre-concentrated strong-magnetism tailings to obtain fluorite flotation concentrates and fluorite flotation tailings. By the method, fluorite concentrates, iron core concentrates, rare earth concentrates and the niobium-enriched slag are obtained finally, and thus, the bayan obo tailings are utilized comprehensively.

The invention discloses a method for preparing sodium antimonate from an antimony oxide ore via an alkaline approach. The method comprises the following steps: (1) leaching the antimony oxide ore, (2) purifying filtrate, and (3) oxidizing the purified filtrate. The method is high in recovery rate, the leaching rate of antimony is 95-99%, the direct recovery rate of sodium antimonate is 90-95%, the whole process is performed under an alkaline environment, the requirement on corrosion resistance of equipment is not high, no complicated pretreatment is required in the process, the needed raw materials are nontoxic and harmless, the alkaline liquid is recyclable, neither waste water nor waste gas is generated in the process, and waste residues are nontoxic and harmless.

The invention discloses a detection method of ultra-high performance liquid chromatography-tandem mass spectrometry of ipconazole residues in maize. The detection method comprises the steps of: firstly extracting the ipconazole in the maize by utilizing an optimized QuEChERS method (purifying agents in extraction and purification steps are three kinds of PSA, C18 and GCB) with acetonitrile as an extraction solvent, and obtaining higher adding standard recovery rate; and then adopting the ultra performance liquid chromatography-tandem mass spectrometry (UPLC-ESI+-MS / MS) to detect the ipconazolein the maize. The detection method is simple, sensitive and selective, and can provide scientific techniques for safety monitoring and environmental behavior assessment of agricultural products.

The invention discloses ferroferric oxide magnetic nanometer particles decorated with tetraazacalix [2] arene [2] triazine. A preparation method of the ferroferric oxide magnetic nanometer particles comprises the following steps of: firstly, covering a silicon shell by using the ferroferric oxide magnetic nanometer particles; decorating with amino to obtain amino-modified ferroferric oxide magnetic nanometer particles; and reacting the ferroferric oxide magnetic nanometer particles with the tetraazacalix [2] arene [2] triazine at 110 DEG C under a nitrogen condition to prepare the ferroferric oxide magnetic nanometer particles decorated with tetraazacalix [2] arene [2] triazine. The ferroferric oxide magnetic nanometer particles integrate the advantages of large superficial area of the original and easiness of separation of the original ferroferric oxide magnetic nanometer particles, and also have a new function characteristic, so that the extraction selectivity of a characteristic target is enhanced; and the ferroferric oxide magnetic nanometer particles are used for extracting and separating, and have the advantages of easiness and convenience in operation, and capability of extracting, enriching and separating organic matters and inorganic cations. And moreover, the ferroferric oxide magnetic nanometer particles can be totally separated from a base solution under an external magnetic field function, so that the ferroferric oxide magnetic nanometer particles are economic, environment-friendly and high in recovery rate and have a good popularization and application prospect.

The invention belongs to the field of nuclear fuel. In order to solve the problem that an MOX fuel pellet waste wet recycling technology has many defects, the invention provides a dry recycling technology for MOX fuel pellet waste. The technology comprises the following steps of 1, burning MOX fuel pellet waste; 2, crushing by using a crusher; 3, screening; 4, ball milling; and 5 recycling. According to the technology provided by the invention, powdering of the MOX fuel pellet waste is achieved by crushing-ball milling technologies, so that the technology is fundamentally different from a dry recycling technology for UO2 fuel pellet waste using an oxidized crushing technology. Practical application shows that the MOX fuel pellet waste wet recycling technology provided by the invention has the advantages of high recycling rate, short recycling technical process, high in speed, simple in equipment, low in cost, and being free from generating radioactive liquid waste, and can be recycled in an MOX combustion manufacturer; the recycled power has similar sintering performance with the common MOX raw material powder, and can be mixed with common raw materials for preparing MOX fuel pellets.

The invention specifically relates to a fused aza-heterocyclic aromatic hydrocarbon porous framework of a two-dimensional lamellar structure, and a preparation method and application thereof, belonging to the technical field of functional materials. According to the invention, aza-heteropolycyclic aromatic hydrocarbon is synthesized on the basiss of cyclization of a diamino group and a diketo group for formation of phenazine and is used as a monomer; and then aza-heteropolycyclic aromatic hydrocarbon is subjected to the Scholl reaction under the catalysis of a Lewis acid salt so as to allow aza-heteropolycyclic aromatic hydrocarbon to undergo homopolymerization at high temperature and low pressure, so a conjugated polymer material of a microporous structure and with two-dimensional lamellar layers for complex catalysis of metal is produced. The two-dimensional material has the characteristics of a high specific surface area, a full conjugate plane structure, heat stability, resistance to acid and alkali, excellent catalytic activity, high recovery rate, etc. The method provided by the invention is simple to operate and controllable in process; and the prepared material can be used for catalyzing a cycloaddition reaction of CO2 with epoxypropane compounds so as to immobilize CO2 and has good application prospects.

The invention discloses a method for determining methamidophos in rice wine and particularly discloses a method for detecting the content of methamidophos in rice wine by utilizing gas chromatography and liquid chromatography-tandem mass spectrometry. The method comprises the following steps: (1) extraction and purification: utilizing a solid phase extraction column to extract the methamidophos in the rice wine and using ethyl acetate to elute the methamidophos adsorbed on the solid phase extraction column; (2) preparation of matrix matched standard working solution; (3) qualitative screening and quantification by utilizing gas chromatography; (4) qualitative confirmation of positive samples by using liquid chromatography-tandem mass spectrometry; (5) blank test; and (6) result calculation and representation. The method has the following beneficial effects: the pretreatment operation is simple and practical, and the recovery rate of the methamidophos is high; and by adopting the matrix matched standard working solution, the problem of matrix effect of the methamidophos on the gas chromatograph is solved, and accurate quantification is implemented.

The invention discloses a method for separating and purifying a crude lanosterol product in the technical field of the purification of organic substances, which comprises the steps of: dissolving the crude lanosterol product into an organic solvent at a temperature of between 25 and 40 DEG C through ultrasonic treatment to obtain a lanosterol solution; and filtering the lanosterol solution by a filter membrane, then using preparative high performance liquid chromatography to adopt overlapping injection for separation and purification treatment to obtain purified lanosterol. The method adopts reversed-phase high performance liquid chromatography, can ensure the characteristics of good resolution, high yield, high recovery rate, good purity and the like, can directly separate to obtain the lanosterol with the purity over 97 percent, and can be used for various sterol-related diseases and the research and development of biosynthetic pathways of various natural products. The method applies technology such as overlapping injection and linear amplification to overcome the disadvantage of low solubility caused by using reversed-phase chromatography to separate the lanosterol, uses a preparation column with the inner diameter of 20mm and the column length of 250mm, ensures that the daily preparation amount can reach near 250mg, and can meet various scientific and research requirements.

The invention discloses a method for expressing and purifying recombinant ethanol oxidase rAOX. According to the method, an ethanol oxidase-poly-L-histidine expression vector pPIC9K-AOX-HIS is constructed first by a molecular biological technique, then the expression vector pPIC9K-AOX-HIS is linearized and transferred to pichia pastoris GS115, and thus, pichia pastoris engineering bacteria capable of expressing active recombinant ethanol oxidase are obtained, and part of recombinant ethanol oxidase can be secreted and expressed. Through optimization of the expression conditions of recombinant ethanol oxidase, the ethanol oxidase produced by the engineering bacteria may reach 1,862U / L. Meanwhile, the secretion and expression of the ethanol oxidase and the introduction of a poly-L-histidine tag simplify the purification process of the recombinant ethanol oxidase. According to the result of tests, the recombinant ethanol oxidase expressed by the engineering bacteria has much higher thermostability than pichia pastoris wide type ethanol oxidase. The operation in the whole process of the method is simple, so the method is suitable for industrial production and can create certain economic benefit.

The invention provides a preparation method of paper cup raw paper. The preparation method comprises steps of pulping, material blending, and paper making. In the step of pulping, a ferrous nitrate solution with a mass concentration of 3 to 6% is added into a slurry material for stirring mixing, wherein 5 to 10g of the ferrous nitrate solution is added into each ton of the slurry material; an obtained mixture is subjected to processing at an ultrasonic frequency ranging from 10 to 50W for 30 to 120s. According to the preparation method, ultrasonic treatment and adding of the ferrous nitrate solution is combined, so that the thickness of plant fiber cell wall is increased greatly, the bulkiness of paper cup raw paper is increased, fiber cutinization in paper cup recycling is avoided, and paper cup recovery rate is increased.

The invention discloses a method for comprehensively recycling sodium, aluminum and iron from red mud. The red mud is mixed with an additive to obtain a raw material, the mixed raw material is subjected to calcination to obtain clinker, the clinker is added to an alkaline adjustment liquid for leaching, slid-liquid separation is performed, and leachate containing aluminum and sodium and magnetic leaching residues are obtained; the additive is a mixed additive composed of a calcium-series additive, a magnesium-series additive and a sodium-series additive. According to the technical scheme, no reducing agent needs to be added, hematite or hematite is converted as magnesioferrite with high magnetism through the magnesium-series additive and enters the leaching residues, and then an iron ore concentrate product is obtained through magnetic separating. In the technical scheme, the atmosphere control process and generation of a great quantity of polluting atmosphere in the current iron recycling process are avoided. In the method, the aluminum recycling rate is 85%, the sodium recycling rate is 92% or above, the sodium content in final residues is lowered to 1% or below, the iron grade of the iron ore concentrate is 50-55%, and the recycling rate is about 70%.

The invention discloses a fly ash hollow microsphere pulsation solid-liquid fluidization sorting recovery device and method. The device comprises an overflow barrel, an overflow material discharging pump, an overflow opening, a water flow distributor, a water inlet, a first water jacking opening, a second water jacking opening, a first electromagnetic butterfly valve, a first throttle valve, a second throttle valve, a high-level water tank, a sorting bed body, a first internal component, a second internal component, a vertical cylinder, an obconical sleeve, a material inlet, a material inlet pump, a material inlet stirring barrel, a material outlet, a second electromagnetic butterfly valve, a pulsation electromagnetic butterfly valve, an underflow material discharging pump, and an underflow barrel. Through joint action of the pulsation electromagnetic butterfly valve and the underflow material discharging pump, a top-to-bottom pulsation water flow is formed inside the sorting bed body,fly ash magma is sorted by density under the action of the pulsation water flow, and sorted fly ash enters the overflow barrel or the underflow barrel via the material discharging pump, so the sorting recovery operation of hollow microsphere in fly ash is completed. The device is simple, the operation is convenient, and the device can be used for continuous sorting recovery operation of the fly ash hollow microsphere.