70results about How to "Improve extraction capacity" patented technology

The invention relates to an X-ray weld defect detection method based on a convolutional neural network, and the method comprises the following steps that a weld image data set containing different types of weld defects is built, and all weld images in the data set are marked with weld labels; an AF-RCNN model is established, wherein the AF-RCNN model comprises a backbone network module, a region generation module and a target classification and position regression module; the backbone network module adopts a residual network (ResNet) and a feature pyramid network (FPN) structure, an efficient convolution attention module is introduced between the residual network (ResNet) and the feature pyramid network (FPN) to enhance the learning ability of the network for unobvious defects and small target features, and a CIOU loss function is introduced to enhance the positioning ability of aiming frames; and an AF-RCNN model is trained by using the established data set, wherein the AF-RCNN model is used for classifying and positioning weld defects. The accuracy of all defects reaches 94% or above, and the detection speed is 11.65 FPS.

The invention provides a magnetic mesoporous silica gel material extracting agent used for enriching and / or separating trace organic pollutants in an environment water sample, and a preparation method thereof. A core of the extracting agent provided by the invention is a silicon gel microsphere (i.e. magnetic silicon gel microsphere) wrapped with a plurality of Fe3O4 magnetic nano particles, and a shell of the extracting agent is a mesoporous silicon gel shell layer with inner and outer surfaces modified by C18 silanization. The extracting agent integrates huge special surface area, excellent extracting capacity and ultrahigh extracting volume of a mesoporous material, magnetic separating capacity of a magnetic material, strong extracting capacity of C18 groups and special volume exclusion function of a vertical channel of the mesoporous material. In addition, the extracting agent provided by the invention has the advantages of high extracting efficiency, low preparation cost and simple preparation method, and is very suitable for preprocessing samples of the trace organic pollutants in a bulk-mass water sample.

The invention relates to a solid phase extraction column based on graphene bonded silica gel, which is used in concentration and separation of organic pollutants in an environmental water sample. A graphene bonded silica gel padding is prepared by taking 3-aminopropyl triethoxy silane (APTES) as the cross-linking agent; then graphene is bonded on the surface of silica gel; after product graphene bonded silica gel granules are evenly filled in a solid phase extraction column, the graphene bonded silica gel based solid phase extraction column is obtained. The performance indicators of the solid phase extraction column are tested through polycyclic aromatic hydrocarbons, including naphthalene, acenaphthylene, fluorene, phenanthrene, fluoranthene and pyrene, and the test result shows that the solid phase extraction column has good extraction efficiency, reproducibility and stability. The graphene bonded silica gel has the characteristics of big specific surface area, strong Pi electron adsorption ability and high extraction capacity of the graphene, and the stable mechanical property and good adsorption ability of the silica gel. Moreover, the solid phase extraction column based on the graphene bonded silica gel is low in preparation cost and simple to operate and is suitable to be used for pretreatment of low-concentration organic pollutants in a big-volume water sample. The solid phase extraction column has a good application prospect in the concentration and separation of environmental organic pollutants.

The invention relates to the absorbent manufacturing for separating Cs and Sr, made of crown ether and aromatic ether loaded on the big hole SiO2 coated with polymer, molecule ratio of the composition being 0. 3-2. 0, mass of the SiO2 being 2-40 times of the total mass of the aromatic ether that has general structural formula I and crown ether 4, and the Sio2 being phenylethene and divinylbenzene polymer. It does not need special dilution or solution treatment, getting over the deficiency of solution extracting, preserving the high volume of extraction.

The invention relates to molecularly imprinted monolithic column solid-phase microextraction fiber and a preparation method, and belongs to the technical field of pretreatment of samples for analytical chemistry. The fiber is composed of graphene and a molecular imprinted polymer; one end of the fiber is fixed on a quartz capillary; and the other end of the fiber is exposed out of the quartz capillary. In preparation, a quartz capillary is inserted into a prepolymer solution containing graphene, template molecules, functional monomers, a cross-linking agent and an initiator, two ends of the quartz capillary are sealed when the quartz capillary is filled with the prepolymer solution; then the sealed quartz capillary is put into a water bath for reaction; the wall of the quartz tube at the middle of the quartz capillary is etched off by a hydrofluoric acid solution; the template molecules in the polymer are removed; and the quartz capillary is broken off from the middle, so that the molecularly imprinted monolithic column solid-phase microextraction fiber is obtained. The preparation method is simple and fast; and the prepared extraction fiber has good chemical stability, mechanical stability and heat stability, high extraction volume, good selectivity for the template molecules and long service life, and has wide application prospects in the fields of analytical chemistry and environmental analysis.

This invention relates to a technology for extracting and separating pure Y oxide applying HAB as the extractant, TBP as the additive, among which, HAB is composed of HA+HB, HA is secondary hepayl phenoxy instead of acetic acid, secondary octyl phenoxy instead of acetic acid etc. HB is a salt base phosphoric acid P204, P507, Cyanax 272, Cyanex 302.

The invention relates to a dipping resin with the surface covered by an ionic liquid film containing extractant, and a fabrication method as well as application thereof. The ionic liquid containing the extractant is fixed in adsorption resin XAD-7; acid or alcohol or heat is not required to be added by using a direct dipping method, the stability of the ionic liquid is hardly affected, and the loading of ionic liquid matrix system in the material is large. Solid-liquid extraction is carried out by using the dipping resin, therefore, the contact area of ion liquid phase and water phase can be effectively increased, the mass transfer efficiency of the system can be improved, clamp strap loss of the ionic liquid can be reduced, and the phenomena of emulsion, phase splitting, etc. in the extraction process can be improved. In an extraction restriction complexation method, complexation agent is added in the water phase, and the extraction efficiency of the ionic liquid phase on the target metallic ions and selection among different metallic ions are improved by the difference of stability constants between the complexation agent and the metallic ions, thus effectively avoiding the phenomena of extraction efficiency reduction and ionic liquid decomposition in the separation process by adjusting the pH value. The two methods can be combined to be applied to imetallic ion separation with excellent separation effect.

The invention provides a well structure of a pressure-releasing coal bed gas ground extraction well and an arrangement method thereof, wherein the well structure includes a first aperture section, a second aperture section and a third aperture section, wherein the first aperture section is in a first vertical depth of a well deflecting drill, the second aperture section is in a second vertical depth of the well deflecting drill, the second aperture section is in a third vertical depth of a vertical drill, and the third aperture section penetrates deeply in a protected layer. The arrangement method comprises the following steps of: drilling outside an extraction region, directionally deflecting drilling the upper parts of the first aperture section and the second aperture section, adopting a straight well body for the lower part of the second aperture section and the third aperture section, and closing to a boundary final hole in the extraction region so that most of the well structure is arranged out of a mining influence range or the region with little mining influence, the stability of the ground extraction well is greatly increased, the construction danger is reduced, the extraction yielding of the coal bed gas well is improved, the damage to the ground well by movement of cover rocks is effectively reduced, and the service time of the ground extraction well is increased.

The invention relates to a method for separating rare earth sulfate solution by saponifiable extraction with ammonia water or liquid caustic soda and belongs to the field of metallurgic chemistry. In the method, Mg<2+>, Fe<2+> or Al<3+> intermediate ions, which serve as a blocker, are introduced to participate in exchange, so the direct contact between ammonium or sodium ions and the rare earth sulfate solution is prevented and the problem of the generation of a complex salt of the ammonium or sodium ions and the rare earth sulfate in a sulfuric acid system extraction separation process is solved. When the method for separating the rare earth sulfate solution by saponifiable extraction is used, the rare earth sulfate solution separation flow can be shortened, the rare earth yield is improved, and the consumption of reagents such as acids and alkalis are reduced.

The invention discloses a monolithic column solid phase extraction sample pretreatment method, which comprises the following steps of: 1) taking a 1-milliliter syringe and a sieve plate, wherein the sieve plate has the diameter of 4.8 millimeters, the thickness of 1.6 millimeters and micron-sized pores; 2) synthesizing the material of a monolithic column on the sieve plate, stuffing the sieve plate serving as a fixed phase into the 1-milliliter syringe, injecting sample solution serving as a liquid phase from the tail end of the syringe, pushing the solution, and enriching target analytes in the sample solution by using the material of the monolithic column on the sieve plate; and 3) analyzing the target analytes enriched on the sieve plate of the monolithic column by using analytic liquid, and performing high resolution liquid chromatographic separation detection. The monolithic column solid phase extraction method has the advantages of high extraction capacity, low extraction backpressure, effectively shortening of extraction time, high extraction efficiency, high detection sensibility, simple operation, good repeatability, and suitability for extracting and enriching trace components in complicated sample matrixes.

The invention discloses a comprehensive recovery and utilization method for a waste vanadium catalyst. The method comprises the steps that water leaching and reductive acid leaching are sequentially conducted on the waste vanadium catalyst; silicon is separated and recycled by being prepared into sodium silicate through alkaline leaching in a residue leaching mode; single-stage extraction is conducted on leachate through saponification P204, vanadium and potassium are extracted and separated through vanadium extraction technologies of tail liquid concentration and separate re-extraction, potassium is separated by preparing potassium sulphate from raffinate through evaporation and concentration, and vanadium is recycled by preparing vanadium pentoxide from an extraction phase through the processes of back extraction, vanadium precipitation, calcination and the like. Through the extremely high selection characteristic of the saponification P204, not only are the extraction capacity, the utilization rate and the vanadium extraction rate increased, but also influences of iron, phosphorus and arsenic on V2O5 purity are effectively avoided, vanadium precipitation can be directly conducted after back extraction, a high-purity vanadium product is prepared, and the phenomenon that chlorine is released in the oxidization process to pollute the environment is avoided. The method has the advantages that the extraction stages and part of the processes are reduced, the technological process is simplified, the cost is reduced, the economic benefit is increased, and the double effects of making the best use of everything and protecting the environment are achieved.

The invention relates to a preparation method for a solid-phase micro-extraction fiber bundle, and relates to preparation of the fiber bundle. The preparation method comprises the steps of (1) preparation of single SPME (solid-phase micro-extraction) fibers based on an integral material: mixing a monomer, a crosslinking agent, a pore-forming agent and an initiator to prepare a uniform solution, then injecting the uniform solution into a capillary which is 5-20cm long and of which the inner diameter is 0.2-0.8mm and the wall thickness is 0.05-0.2mm, sealing two ends of the capillary, performing polymerization, removing a section, which is 1-3cm long, of the capillary, putting the integral material fiber into a soxhlet extractor, performing extraction through a solvent, or putting the fiber into the solvent, and soaking the fiber until no impurity is detected from the liquid so as to obtain the single SPME fibers based on the integral material; (2) preparation of the solid-phase micro-extraction fiber bundle: combining 2-6 of the single SPME fibers based on the integral material on the capillary to obtain the solid-phase micro-extraction fiber bundle. The preparation method is simple, high in extraction capacity, high in extraction speed, low in cost and easy to operate.

The invention provides a carbon nanotube solid phase extracting disk for enriching and / or separating organic pollutants in an environmental sample and a preparation method thereof. The extracting disktakes a carboxylated single-walled carbon nanotube as a core and is covered with a hydrophilic polymer on the outer layer, and preferably, a carboxylated single-walled carbon nanotube extracting diskcovered with the hydrophilic polymer. The extracting disk simultaneously combines small grain diameter, high extraction speed, large special surface area of nano material, strong adsorption capacityof carbon nanotubes, electrostatic adherence of surface carboxyl as well as fine hydrophilicity and volume exclusion of an alginic acid polymer and also has higher enrichment and extraction capacity to endocrine disrupters and sulfonamides. In addition, the extracting disk is simple to prepare, low in cost and very suitable for rapidly preprocessing large-scale and large-volume water samples in batch.

The invention belongs to the technical field of recycling and reusing of waste cathode materials for lithium ion batteries. The invention provides a green extraction and separation method based on ionic liquids to realize the extraction and separation of metal ions in a leaching solution of waste nickel-cobalt manganic acid lithium battery anode pieces. The extraction method of the metal ions in alithium ion battery leaching solution by using the ionic liquids comprises the steps of extraction, separation, back extraction and the like to realize the extraction and the separation of the metalions in the waste lithium ion battery leaching solution without adding organic solvent diluents. The extraction agent has good stability, can be recycled for many times and has a high extraction capacity.

The invention discloses an extraction separation method of a rare earth element. The method comprises the steps of adopting an acid-alkaline composite extraction agent for separating the rare earth element, during the extraction process, extracting a water phase of an intermediate stage of an extraction section, after extracting and separating through an alkaline extraction agent, returning to theextraction section, and continuously extracting; and introducing a water phase discharged from a washing section into the intermediate stage of the extraction section, extracting, and returning waterwashing liquid discharged by a water washing section to the water washing section, the washing section and the extraction section so as to be used or used for preparing acid for dissolving rare earthore. According to the extraction separation method of the rare earth element provided by the invention, the cyclic utilization of the acid-alkaline composite extraction agent is realized, water and acid are recycled, the extraction capacity of the acid-alkaline composite extraction agent is improved, and the rare earth extraction separation cost is remarkably reduced.

The invention discloses a text understanding method based on external knowledge embedding. The method comprises the following steps: dividing entities in a data set through a clustering algorithm, andadding a negative triad in the data set through random sampling splicing; then, building a BERT network under a Keras deep learning framework, and coding entity relations in the knowledge graph to obtain a corresponding representation vector; extracting low-level features of different dimensions by using multi-granularity convolution so as to further improve the feature extraction capability of the model; mining the deep relationship between entities through the capsule neural network so as to complement the knowledge graph and improve the knowledge accuracy; fusing the code of the entity relationship serves as external knowledge with text entity information; and finally, interacting the knowledge vector with the text context by using a self-attention mechanism, and acquiring an answer through a multi-layer perceptron. Therefore, the method can enable a machine to well understand the meanings of the preceding and following texts, and enables the intelligent level of the network to behigher, and closer to the cognitive thinking of human beings.

The invention provides a one-dimensional nano-array zinc oxide solid phase micro-extraction coating and a preparation method thereof. The one-dimensional nano-array zinc oxide solid phase micro-extraction coating of the invention is a one-dimensional nano-array zinc oxide coating covering the fiber of an extraction head, and the coating is prepared by a hydrothermal method to directly generate the one-dimensional nano-array zinc oxide coating on the solid phase micro-extraction fiber. The one-dimensional nano-array zinc oxide coating of the invention fully utilizes the particular characteristics of nano materials, thus greatly improving the extraction capacity, and significantly improving the selectivity of the coating extraction; the preparation method has strong operability, and the coating prepared by the method has good thermal stability and surface evenness.

The invention discloses an extraction vanadium recovery process. Spent vanadium catalysts are subjected to water leaching and reductive acid leaching treatment to obtain VOSO4-containing extracted raw liquid, the raw liquid is subjected to the single-stage extraction, tail liquid concentration, separate reextraction and back extraction vanadium recovery process, vanadium precipitation is carried out with ammonium hydroxide, and roasting is conducted to produce vanadium pentoxide. Saponified P204 is adopted as a main extraction agent, it is ensured that the pH value of the whole system is within the optimal pH value range in the extraction process, the extraction system can maintain a stable pH value, and the single-stage extraction rate of vanadium is greatly improved to above 96.4%; tetravalent vanadium obtained through extraction can be directly subjected to vanadium precipitation without oxidation, a high-purity vanadium product is produced, the technological process is simplified, and atmosphere pollution caused by chlorine generated by chlorate vanadium oxide is avoided; meanwhile, the selectivity characteristic of the saponified P204 is utilized, the influences of iron, phosphorus and arsenic on purity of extracted vanadium are effectively avoided, a part of impurity removal work is reduced, raw material consumption is reduced, enterprise cost is reduced, and economic benefits are remarkable.

The invention discloses a method for rapidly detecting sulfonamide antibacterial medicines in milk by using an in-tube solid-phase micro-extraction technology, belonging to the technical field of analytic chemistry. The method comprises the following steps: firstly taking a graphene-embedded n-butyl methacrylate-ethylene glycol dimethacrylate porous polymer monolithic column as an extraction phase of in-tube solid-phase micro-extraction, extracting sulfonamide antibacterial medicines in milk, performing analysis, then reacting with fluorescamine to produce a derived material with strong fluorescence properties, and finally separating and detecting a derived sample by using a capillary electrophoresis-laser-induced fluorescence detector. The method disclosed by the invention is simple to operate, is environmentally friendly, is high in detection sensitivity and short in detection time, is a simple, convenient, rapid and accurate analysis method, and has wide application prospects in the fields of environmental analysis and food safety.

The invention discloses a branched-chain long-chain fatty acid base imidazoline extraction agent and a preparing method and application thereof. The imidazoline extraction agent comprises multiple N atoms and long-branch-chain alkyl groups. The preparing method of the imidazoline extraction agent comprises the steps that in the normal pressure, carboxylic acid and polyethylene polyamine are subjected to the reaction under the action of a solid catalyst, after the reaction is finished, the solid catalyst is recycled through solid-liquid separation, the liquid mixture is distilled, the raw material incompletely reacted is recycled, and then the branched-chain long-chain fatty acid base imidazoline extraction agent is obtained. The preparing method has the beneficial effects that reaction conditions are moderate, the catalyst can be repeatedly used, and equipment investment and operation cost are low; the imidazoline extraction agent is used for extraction negative ions including tungsten, molybdenum and vanadium, the beneficial effects that the extraction volume is high, the phase splitting time is short, and the extraction and reverse extraction performance is excellent; and good industrial application prospects are achieved.

The invention relates to a preparation and high performance liquid chromatography combination method of a difunctional monolithic column for nitrated polycyclic aromatic hydrocarbons. The method belongs to the fields of analytical chemistry and environmental chemistry, and is an in-pipe monolithic column reduction-in-pipe solid phase microextraction-high performance liquid chromatography separation-laser-induced fluorescence detection method. The method comprises the steps of adopting a porous polymer monolithic column embedded with platinum loaded graphene as a reduction column and a solid phase microextraction column of the nitrated polycyclic aromatic hydrocarbons for carrying out high-efficiency reduction and high-efficiency enrichment on a target compound, and after separating through a capillary chromatographic column, adopting a laser-induced fluorescence detector with high sensitivity and low detection limit for detecting.

The invention discloses a method for removing impurities from rare earth ore leachate. The method comprises the steps that suspended matter, sediment and silicon are removed simultaneously, specifically, a mixed impurity removal agent is added into the rare earth ore leachate to be subjected to stirring reaction under a heating or no-heating condition and to be subjected to still standing and solid-liquid separation, and filtrate is collected for the subsequent step; the mixed impurity removal agent is a combination of two or more of polyacrylamide, barium chloride, diatomite and polyethyleneglycol, or a combination of polyaluminum chloride and / or polyferric sulfate and one or more of polyacrylamide, barium chloride, diatomite and polyethylene glycol; the solid-liquid ratio of the mixed impurity removal agent to the rare earth ore leachate is 0.001-1kg:100L. Through the method, the impurities such as the suspended matter, sediment and silicon in the rare earth ore leachate can be effectively removed, and disturbance of the impurities on extraction and separation of rare earth elements is avoided.

The invention provides a nanometer composite material, a preparing method and application. The nanometer composite material comprises an inner core, half-generation dendrimers grafted on the inner core through a silane compound, and an aniline compound bonded on the half-generation dendrimers. The inner core is made of a magnetic core-shell nanometer material. Ester groups are formed at the tail ends of the half-generation dendrimers. The number of amino groups of the aniline compound is larger than or equal to 2. Compared with the prior art, the surface of the magnetic core-shell nanometer material is grafted with a branched structure, density of surface reaction groups is increased through the branched structure, the aniline structure at the tail end and nitrite in a solution react to generate diazonium salt, fluorescent dye molecules are bonded on the surface of the nanometer material in a covalent mode, the surface adsorption balance is not involved, extraction efficiency is high, the number of surface binding sites is large, extraction capacity is large, detection sensitivity is improved, fluorescence quantitative analysis is directly carried out after magnetic separation, and the analysis method is simple.

The invention relates to an efficient extraction method of curcumin. The method comprises the following steps of: 1, adding an extracting agent A into crushed curcuma longa powder, and performing filtering to obtain a solid material I; 2, adding an extracting agent B into the obtained solid material I, and performing filtering to remove slag to obtain an extracting solution II; 3, centrifuging theextracting solution II, and performing filtering to obtain a solid material III; and 4, cleaning and drying the solid material III to obtain curcumin; specifically, the extracting agent A comprises asolvent a, and the solvent a contains the following structure shown as formula (1) in the specification, in the formula (1), Y<-> is one of Cl<->, Br<->, N(CN)2<->, HCOO<-> and CH3COO<->; and the extracting agent B contains a solvent b, and the solvent b contains the following structure shown as formula (2), in the formula (2), B<-> is a metal chelating anion. According to the characteristics ofcurcumin, a method for extracting the curcumin by combining the extracting agent A and the extracting agent B is designed, so that the yield of the curcumin is relatively high, the use of organic reagents is greatly reduced, and the green and environment-friendly requirements are met.

The invention relates to a method of utilizing V5+ to extract and gather a vanadium-containing solution. The method includes: adjusting pH value of vanadium-containing material leaching stoste to below 7 to generate precipitate or floccule; adding an oxidizing agent while stirring for reaction, wherein when a reaction solution gradually becomes crineous, vanadium ions in the reaction solution are oxidized into V5+; filtering the reaction solution, wherein obtained filtrate is extraction stoste; adjusting pH value of the extraction stoste to below 7, adopting an extraction organic phase with a pH value equal to the pH value of the extraction stoste to perform countercurrent extraction on V5+ in the extraction stoste to obtain an organic phase rich in V5+ and extraction residual water, subjecting the organic phase rich in V5+ to reverse extraction through a stripping agent solution to obtain reverse water rich in V5+, and storing the reverse water to obtain the vanadium-containing solution extracted and gathered by utilizing V5+. Valent state of V5+ is utilized to extract, purify and gather the vanadium-containing solution, so that the valent state does not need to be changed repeatedly, and vanadium recovery rate is high.

The invention discloses a method for preparing carbon nano particle extraction coating solid phase micro-extraction fiber. The method is characterized in that a carbon coating is produced on the surface of fiber matrix by employing a flame method, the carbon nano particles and appropriate coating thickness can be obtained by controlling the preparation condition, and the carbon nano particle extraction coating solid phase micro-extraction fiber can be obtained. The prepared extraction coating possesses the advantages of high stability, strong enrichment capability and the like, the obtained solid phase micro-extraction fiber can be used for food analysis, environment analysis, biological analysis and the like.

The invention discloses a hydrophobic deep-eutectic solvent used for separating nickel and cobalt ions, a preparation method of the hydrophobic deep-eutectic solvent and a method for separating the nickel and cobalt ions. In the hydrophobic deep-eutectic solvent, the molar ratio of a hydrogen bond donor to a hydrogen bond acceptor is (1: 1)-(1: 1.5); the hydrogen bond acceptor adopts trioctyl methyl ammonium chloride, and the hydrogen bond donor adopts menthol; or the hydrogen bond acceptor adopts trioctyl methyl ammonium bromide, and the hydrogen bond donor adopts menthol; or the hydrogen bond acceptor adopts trioctyl methyl ammonium bromide, and the hydrogen bond donor adopts thymol. The method for separating the nickel and cobalt ions comprises the following steps that a nickel-cobalt mixed solution is mixed with the hydrophobic deep-eutectic solvent, centrifugal phase separation is carried out after extraction equilibrium to obtain a cobalt-containing organic phase, cobalt in the organic phase is reversely extracted into a water phase by adopting a sodium sulfate water solution, and meanwhile, the hydrophobic deep-eutectic solvent is reused. The method is not easily influenced by acidity during nickel and cobalt ion separation, meanwhile, the extraction capacity is high, and reverse extraction is easy.

The invention discloses a cold reheating and hot reheating cooperative steam supply system and method. The steam supply system is arranged in a thermal generator set, wherein first-section steam extraction and second-section steam extraction of a high-pressure cylinder are connected to steam side inlets of a high-pressure heater 1 and a high-pressure heater 2 through pipelines respectively, in a reheating system, a hot section of a reheating steam pipeline is connected between an outlet of a boiler reheater and a steam inlet of a medium-pressure cylinder of a steam turbine, a cold section of the reheating steam pipeline is connected between a steam exhaust port of a high-pressure cylinder and an inlet of the boiler reheater, reheating steam pipeline cold-section extraction steam is connected with a cold-section steam inlet of a steam supply header through a cold-section steam extraction pipeline, in the reheating system, reheating steam pipeline hot-section extraction steam is connected with a steam cooler steam side inlet through a hot-section steam extraction pipeline, and a steam cooler steam side outlet is divided into two branches, the first branch is connected with a hot-section steam inlet of the steam supply header, the second branch is connected with a second-section steam extraction pipeline of the high-pressure cylinder, and the two ends of the water side of a steamcooler are connected with a water side inlet of the high-pressure heater 1 and a water side outlet of the high-pressure heater 2 respectively.

The invention provides a preparation method of diluent for spent fuel aftertreatment, and belongs to the technical field of nuclear fuel circulation. The preparation method comprises the following steps: with isobutene as raw materials, the selective hydrogenation is performed under the catalyst effect to generate hydrogenated isobutene; then, compound components are fed in the hydrogenated isobutene for mixing to obtain branched paraffin mixture diluent; the catalyst is a loaded metal catalyst; and the compound components are poly alpha-olefin or F-T synthesized oil. The preparation method has such advantages as simple operation, short flow, low cost and low technical difficulty; and through introduction of second components for adjusting compositions and performances of hydrogenated products, new thoughts are provided to such application scenes as high-discharge waste liquid treatment.

The invention provides a method for extracting metal solvent which increases an extracted amount throughout a year and keeps the extracted amount. The method keeps a temperature of a DBC solvent at 25 degree or higher, and improves a phase splitting property of a solution and the solvent to enhance the extraction capability.