41results about How to "Reduce add" patented technology

The invention discloses a treatment process of photovoltaic cell production wastewater, and relates to the technical field of industrial wastewater treatment. Comprising the following steps: treating dilute acid and dilute alkali through a reclaimed water recovery membrane system to obtain first produced water and reclaimed water concentrated water; treating the concentrated acid wastewater and the reclaimed concentrated water through a fluorine-calcium crystallization system to obtain defluorinated concentrated water and calcium fluoride crystals; treating the RO concentrated water and the defluorinated concentrated water by a hardness removal recycling system to obtain hardness-removed concentrated water and second produced water; treating the concentrated alkali wastewater through an alkali recovery membrane system to obtain purified alkali and alkali-removed concentrated water; hardness-removed concentrated water and alkali-removed concentrated water are treated by a comprehensive physicochemical system, and then are sequentially treated by a high-power concentration membrane system and a zero-discharge crystallization system to obtain solid wastes. The photovoltaic cell production wastewater treatment process provided by the invention achieves an economical and feasible zero-emission solution.

The invention provides clarified defatted coconut milk, a preparation method thereof and application of the clarified defatted coconut milk in tea beverages. The preparation method of the degreased coconut milk comprises the following steps: S1, crushing and squeezing coconut meat to obtain coconut milk; s2, the coconut milk is filtered and centrifuged, a grease layer and an insoluble substance layer are removed, and degreased coconut milk is obtained; s3, sequentially adding pectinase and protease into the degreased coconut milk for enzymolysis, and filtering to obtain filtered pulp; and S4, adding a compound enzyme preparation into the filtered slurry, carrying out ultrasonic treatment, enzyme deactivation and filtration, centrifuging the filtrate, taking a clear juice layer, and filtering to obtain the clarified degreased coconut milk. According to the method, coconut pulp is taken from coconuts with proper fruit age and is juiced to prepare the coconut milk, and then proper filtration, clarification and centrifugal extraction conditions are combined, so that carbohydrates in the coconut milk can be better reserved, and substances such as protein and pectin in the coconut milk can be effectively removed or degraded, so that the degreased coconut milk becomes clear, and the quality of the coconut milk is improved. And turbidity or precipitation can be effectively avoided after the defatted coconut milk tea beverage is compounded.

The invention discloses a preparation method of a cyclotriphosphazene Schiff base carboxylic acid rare earth complex and application of the cyclotriphosphazene Schiff base carboxylic acid rare earth complex in preparation of a flame-retardant high polymer material. The cyclotriphosphazene Schiff base carboxylic acid rare earth complex is prepared by reacting raw materials including p-hydroxybenzaldehyde, anhydrous potassium carbonate, phosphonitrilic chloride trimer, p-aminobenzoic acid and rare earth chloride heptahydrate. The cyclotriphosphazene Schiff base carboxylic acid rare earth complex prepared by the invention has the effects of catalyzing char formation and capturing free radicals based on the combined action of rare earth elements and phosphorus elements, has an efficient flame retardant effect, is small in addition amount, and can effectively reduce the total addition amount of the flame retardant when being compounded with other halogen-free flame retardants.

The utility model relates to the technical field of soil stabilizer preparation, and discloses a preparation device based on an environment-friendly soil stabilizer, which comprises a preparation tank, a tank cover is detachably arranged at the top end of the preparation tank, a motor is embedded and connected in the center of the upper surface of the tank cover, and the power output end of the motor penetrates through the tank cover and extends to the upper end of an inner cavity of the preparation tank. The power output end of the motor is detachably connected with a transmission rod, the transmission rod is vertically arranged in the center of an inner cavity of the preparation tank and extends to the bottom end of the inner cavity of the preparation tank, a filter plate is detachably arranged at the upper end of the inner cavity of the preparation tank, and the center of the filter plate is arranged on the surface of the upper end of the transmission rod through a nested shaft sleeve; during preparation, the solid solvent can be crushed, so that the solid solvent can be quickly dissolved in a solution and fully mixed, the waste of raw materials can be avoided, and the preparation efficiency and quality of a fixing agent are improved.

This invention discloses a medium carbon steel for steering screws in new energy vehicles and its production method. The chemical composition of the medium carbon steel, by mass percentage, is as follows: C: 0.45%~0.70%, Si: 0.25%~0.55%, Mn: 0.45%~1.05%, Cr: ≤0.40%, Mo≤0.40%, Ni≤0.40%, P≤0.035%, S: 0.015%~0.035%, O≤0.0012%, with the balance being Fe and unavoidable impurities. The production method includes a complete process: molten iron pretreatment – ​​converter smelting – LF refining – RH furnace vacuum degassing – continuous casting – rolling – quenching and tempering – finishing – sub-critical quenching – low-temperature tempering. By controlling the composition to reduce the addition of expensive alloying elements, and through a composite heat treatment of "quenching and tempering + sub-critical quenching + low-temperature tempering," a hardness gradient of ≥60HRC on the surface and 22~28HRC in the core is achieved, with no decarburized layer on the surface. Simultaneously, strict control of non-metallic inclusions enhances the purity of the steel. This invention's product is compatible with cyclone milling processes, exhibits minimal quenching deformation, and can be straightened, meeting the high precision and long service life requirements of steering screws in new energy vehicles.

The invention discloses a preparation method of a composite catalyst for synthesizing 1, 4-butynediol, and relates to the technical field of BDO synthesis, the preparation method comprises the following steps: preparing a solution A from active metal salts of copper and zirconium, preparing a solution B from active metal salts of copper, bismuth and magnesium, and dissolving a precipitator in deionized water to prepare a solution C; synchronously dropwise adding the solution A and the solution C into a buffer solution at a constant speed to form slurry D; then the solution B and the solution C are dropwise added into the slurry D synchronously at a constant speed to form slurry E, and the slurry E is continuously subjected to a reaction or a hydrothermal reaction; and aging, filtering, washing and drying after the reaction is completed to obtain the catalyst. The composite catalyst prepared by the method is large and uniform in particle size, is beneficial to solid-liquid separation, shows relatively high activity and selectivity, and is mainly applied to the field of catalytic reaction for preparing 1, 4-butynediol.

The application discloses a rice straw-based liquid mulch emulsion and a preparation method and application thereof. The preparation method comprises the following steps: adding pretreated rice straw into a sodium hydroxide solution for alkali treatment, so as to obtain rice straw fibers and a silicon-containing black liquor; washing and bleaching the rice straw fibers, so as to obtain bleached rice straw fibers; first standing the silicon-containing black liquor, then adjusting the pH value, and continuing to stand, so as to obtain a silicon-containing dispersion liquid; mixing the bleached rice straw fibers with an alkaline alcohol solution and activating, then adding chloroacetic acid for etherification reaction, so as to obtain carboxymethyl cellulose; mixing a polyvinyl alcohol solution and the carboxymethyl cellulose solution, and adding the silicon-containing dispersion liquid under stirring, and then supplementing water, so as to obtain the rice straw-based liquid mulch emulsion. The rice straw-based liquid mulch emulsion prepared by the application can be applied to the covering of cultivation soil, has the advantages of excellent film forming strength, toughness, light shielding and soil covering adaptability, and the like, and has the advantages of wide raw material sources, simple preparation process and suitability for large-scale popularization.

The invention discloses a cool regenerated colored polyamide fiber and a preparation method thereof, and belongs to the technical field of chemical fiber preparation. The preparation method comprises the following steps: firstly, melting and spinning cool master batch, regenerated chinlon chips and other raw materials to prepare cool regenerated chinlon POY (Polyester Pre-Oriented Yarn) fibers; meanwhile, melt spinning is conducted on the color master batch, the regenerated chinlon slices and other raw materials, and stock solution coloring regenerated chinlon POY fibers are prepared; and finally, stranding the two functional POY fibers through a false twist texturing process to prepare the cool regenerated colored chinlon DTY fiber. By means of the step-by-step spinning and plying elasticizing integrated technology, the cool feeling, coloring and regeneration environment-friendly characteristics are combined in the fiber manufacturing stage, and the final product has the comprehensive advantages of being excellent in cool feeling durability, high in color fastness, simplified in production technology and environmentally friendly.

The present invention discloses a one-step method for directly synthesizing N-acyl amino acid compounds based on deep eutectic solution and using a deep eutectic solvent as a medium. The preparation method of the deep eutectic solvent provided by the present invention uses an amino acid surfactant to produce a substrate as a component, reduces the addition of additional compounds in the reaction system, reduces production costs, and simplifies the post-processing impurity removal process. The deep eutectic solvent used therein has the advantages of maintaining enzymatic properties and good substrate solubility, and can be used to catalyze the esterification reaction of fatty acids and amino acids to prepare N-acyl amino acid compounds. The preparation method of N-acyl amino acid compounds provided by the present invention has a simple preparation process, low production cost, and is green and safe.

The invention discloses a fire-resistant flame-retardant coating, a cable wrapping tape and a preparation method thereof, and the preparation method comprises the following steps: carrying out oxygen plasma bombardment treatment on fire-resistant particles to obtain surface hydroxylated fire-resistant particles; dispersing the surface hydroxylated fire-resistant particles and carboxylated nanocellulose in a dispersion liquid according to a mass ratio of (5-15): 1 to obtain a cellulose-coated fire-resistant particle buffer solution; 26-38 parts of a buffer solution, 40-50 parts of water, 18-25 parts of ammonium polyphosphate, 12-18 parts of a charring agent, 5-8 parts of a nitrogen flame retardant, 18-25 parts of an AVE emulsion and 0.4-0.8 part of a defoaming agent are fully and uniformly mixed, and the water-soluble fireproof flame-retardant coating is obtained. A phosphorus-nitrogen flame retardant is compounded with a carbon forming agent to form a carbon shell after combustion, optimized and dispersed fire-resistant particles are uniformly inserted into the carbon shell by virtue of the expansion effect of the carbon forming agent to form fire-resistant particle aerogel, a cross-interpenetrating network structure of the fire-resistant particle aerogel and the carbon shell is formed, and a cross-interpenetrating flame-retardant layer which is flame-retardant, heat-insulating and fire-resistant is formed after a surface coating is combusted; and a stable environment is provided for normal operation of the cable.

The invention discloses a method for treating radioactive waste through plasma, and belongs to the technical field of nuclear waste treatment. The method comprises the following steps: taking glass fibers, boron-containing concentrated solution evaporated salt and a glass additive as raw materials, and adjusting the chemical composition of the raw materials to obtain an adjusted waste material containing boron oxide, calcium oxide, aluminum oxide, sodium oxide and silicon dioxide; and carrying out plasma melting and curing treatment on the waste material subjected to chemical composition adjustment. According to the method for treating the radioactive waste through the plasma, the plasma high-temperature melting technology is adopted, the glass fiber, the boron-containing concentrated solution evaporation-dried salt and the glass additive serve as raw materials, and the chemical composition of the raw materials is adjusted, so that the melting temperature of the plasma high-temperature melting technology is reduced, the temperature of glass melt is reduced, and discharging is convenient; and the treatment of the glass fiber and the boron-containing concentrated solution can be realized, so that the volume of the glass fiber and the boron-containing concentrated solution can be reduced to the maximum extent, the addition of glass raw materials can be reduced, and the recycling and minimum treatment of radioactive wastes can be realized.

The invention discloses a method for producing a butanol system through fungus-bacterium co-culture fermentation alkali pretreatment of rice straw, and belongs to the technical field of microbial fermentation production of clean energy. The problem that a large number of cellulase preparations need to be used in the butanol fermentation process of existing lignocellulose biomass is solved. The method comprises the following steps: 1, pre-culturing clostridium beijerinckii in a reinforced clostridium culture medium; 2, culturing trichoderma reesei in potato dextrose agar, collecting spores, and inoculating the spores into a spore culture medium for culturing; and 3, inoculating the trichoderma reesei inoculum into a co-culture medium taking straws as a carbon source for culture, and then inoculating the clostridium beijerinckii inoculum. The method is used for a system for producing butanol by pretreating rice straws through fungus-bacterium co-culture fermentation alkali.

This invention relates to the field of carbon material preparation technology, specifically disclosing a method for preparing porous carbon materials using a hierarchical synergistic activation method and its application. This method uses waste biomass from *Siraitia grosvenorii* pomace as raw material, sequentially undergoing low-temperature pre-activation, water washing, high-temperature synergistic activation, and isothermal acid washing to obtain porous carbon materials with ultra-high specific surface area. Scanning electron microscopy analysis and pore structure detection results show that the carbon material exhibits a hierarchical porous layered structure. Electrochemical tests show that the material possesses excellent capacitance performance, with a specific capacitance reaching 200-450 F / g at a current density of 0.5 A / g. When this porous carbon material is assembled into a symmetrical supercapacitor, after 10,000 cycles at a current density of 10 A / g, the specific capacitance retention rate remains above 90%, demonstrating good cycle stability and showing promising application prospects in the field of energy storage.

The present application relates to a kind of high flame-retardant low-toxicity environmental protection computer cable and its preparation method, belong to computer cable technical field.The insulating layer and / or sheath layer of the cable uses environmental protection toughening flame-retardant composite material, it is with polyolefin resin as matrix, compound modified nano-aluminum hydroxide with KH560 silane coupling agent, melamine cyanurate, gradient compound ethylene-vinyl acetate copolymer and maleic anhydride graft polyolefin, by limiting core component ratio and key parameter, realize high flame-retardant, low-toxicity environmental protection and low-temperature toughness Synergistic unity.The present application process is simple and easy industrialization, applicable to computer room, automation control system, instrument signal transmission and other scenes, practicality is strong.

The application discloses a kind of preparation methods of flame-retardant aging-resistant high-transparency polyurethane, the polyurethane is first with 2-amino-1,3-propanediol, 2-chloro-4,6-diphenyl-1,3,5-triazine, diphenyl phosphorochloridate and triphenylchlorosilane composite preparation DADT, then DADT is mixed with polyether polyol, isocyanate to obtain;The preparation method of the application is simple, the process is easy to control, the obtained polyurethane material limit oxygen index reaches 29.6%, meets commercial flame-retardant standard and reaches UL-94 V-0 flame-retardant grade;Material has excellent aging resistance, heat-oxygen tensile strength retention rate is 88.5%, heat-oxygen breaking elongation retention rate is 77.4%, and ultraviolet breaking elongation retention rate is 71.4%, can be applied to automobile ultraviolet protection diaphragm, flame-retardant filled foam, fire guide sign protection film and the like scene.

The utility model relates to lithium sink mother liquor recycling technical field, specifically disclose a lithium sink mother liquor recycling system, including the lithium sink mother liquor storage tank, neutralization device, filtering equipment, evaporator and centrifugal device connected in proper order through pipeline, the solid phase recovery device is connected to the solid phase outlet of centrifugal device, and the liquid phase recovery device is connected to the liquid phase outlet of centrifugal device, and the neutralization device includes neutralization jar, and the top of neutralization jar is provided with primary lithium sink mother liquor feeding port and sulfuric acid feeding port, and the sulfuric acid feeding port is connected with sulfuric acid storage tank through sulfuric acid pump, and the bottom of primary lithium sink mother liquor feeding port is connected with first spiral dispersion feeding pipe, and the bottom of sulfuric acid feeding port is connected with second spiral dispersion feeding pipe, and the pH monitor is arranged in neutralization jar, and the outside of neutralization jar is provided with temperature control jacket, and the circulating cooling water is circulated in temperature control jacket. The system can reduce the addition of auxiliary materials, reduce energy consumption, improve the resource utilization rate and economic benefit of lithium carbonate production.

The invention discloses a low-rare-earth permanent magnetic ferrite double-high material and a preparation method thereof, and belongs to the technical field of permanent magnetic materials. The invention relates to a low-rare earth permanent magnetic ferrite double-high material, which is prepared from the following raw materials: Fe2O3, SrCO3, La2O3, Co2O3, CaCo3 and a catalyst. The invention relates to a preparation method of a low-rare-earth permanent magnetic ferrite double-high material. The preparation method comprises the following steps: burdening, mixing, dehydrating, carrying out primary forming, crushing, carrying out secondary ball milling, carrying out secondary forming and sintering. The low-cost double-high-ferrite permanent magnet material is prepared by reducing the replacement amount of La and Co combined ions in the material, adding a proper amount of catalyst and adopting a special process. According to the ferrite double-high material prepared by the invention, the raw material use cost is reduced, and the ferrite double-high material has more advantages in market competition.

The present application relates to a kind of crusher super wear-resistant cone lining plate steel and its preparation method, contains the following components by mass percentage: C:1.30-1.50%, Mn:22-25%, Si:0.35-0.80%, Cr:2.0-2.5%, V:0.1-0.15%, Ti:0.06-0.12%, N:0.05-0.08%, Mo:0.3-0.6%, P≤0.035%, S≤0.015%, the balance is Fe and inevitable impurities.Mass ratio of Mn / C is 16-18, mass ratio of Cr / V is 16-20, and total mass ratio of Cr+Mo≤2.8%.The hardness of steel can reach 289HB, impact toughness can reach 203J / cm 2 , tensile strength can reach 849MPa, reduce the mass addition of Ni, Mo and other elements, greatly reduce cost.

The invention discloses a fresh and fragrant oyster seasoning peptide and a processing method thereof, and belongs to the technical field of biology. The method comprises the following steps: by taking fresh oyster meat as a raw material, repeatedly treating oyster meat liquid and oyster cooking normal juice by combining an enzymolysis method and a membrane filtration method, then uniformly mixing the oyster meat liquid and the oyster cooking normal juice to obtain an oyster enzymolysis product consisting of small-molecule active peptides, and adding D-fucose into the oyster enzymolysis product to form a Maillard reaction system. And reacting to obtain the fresh and fragrant oyster seasoning peptide. According to the method, the defect that a traditional process is uncontrollable is overcome, the oyster meat liquid and the oyster cooking normal juice are subjected to multi-stage multi-time enzymolysis by combining an enzymolysis method and a membrane filtration method, the small-molecule active peptide with accurate activity retention can be prepared without enzyme deactivation, and the oyster enzymolysis product with the small-molecule active peptide and D-fucose are subjected to Maillard reaction treatment, so that the content of the D-fucose in the oyster meat liquid is increased, and the content of the D-fucose is increased. The prepared fresh and fragrant oyster seasoning peptide not only corrects the original sea fishy smell in oysters, but also has sweetness and baking fragrance, and can realize aroma enhancement and seasoning functions without introducing other seasonings.

The invention discloses a method for separating iron and scandium from cobalt-nickel hydroxide raw materials, and relates to the technical field of hydrometallurgy. According to the method, nickel and cobalt are reduced and leached with a proper amount of hydrogen peroxide under the acidic condition, the pH value of feed liquid is adjusted after the reaction is finished, and iron and scandium are co-precipitated to form mixed slag to be separated out; the mixed slag is completely dissolved with sulfuric acid and an oxidizing agent, the solution is pumped into a high-pressure kettle, ferrous iron in the solution is converted into insoluble hydrated iron oxide red under the action of certain oxygen atmosphere pressure and temperature, scandium is still left in the solution, at the moment, the pH value of the solution is adjusted, and then pure scandium hydroxide is precipitated; the method has the characteristics that the trace scandium element is effectively separated from the cobalt-nickel hydroxide raw material to the greatest extent by adopting a simple process and equipment, and meanwhile, the impurity iron is converted into an iron oxide red material commonly used in the building material industry.

The invention provides a circulating device and a circulating method for electrolytic recovery of copper ions, the circulating device comprises an electrolytic bath, an electroplating device and an etching device, and a cation exchange membrane and an anion exchange membrane are arranged in the electrolytic bath; the cation exchange membrane and the anion exchange membrane sequentially divide the electrolytic tank into an anode regeneration tank, an intermediate circulating tank and a cathode electrolyte tank; the etching device comprises a first circulating device and an etching machine which are circularly connected, the first circulating device is circularly connected with the anode regeneration tank, the electroplating device comprises a second circulating device and a VCP electroplating mechanism which are circularly connected, and the second circulating device is circularly connected with the middle circulating tank. According to the method, the copper ions are recycled from the etching liquid with the high copper ion content and supplemented to the solution consuming the copper ions in the VCP copper electroplating process, and the problems that the etching liquid with the high copper ion content needs to be electrolyzed and recycled into metal copper, and the metal copper is smelted to become a copper anode, so that repeated energy waste and repeated transportation are caused are solved.

The utility model relates to feed processing technical field discloses a kind of oil heating dilution mixing and adding equipment, including shell, feeding assembly, feeding assembly, heating assembly and mixing assembly, feeding assembly is installed on shell upper end right side, feeding assembly is installed in feeding assembly inside, heating assembly is installed in shell inside left side, mixing assembly is installed in shell inside.The utility model has following advantages and effects: feeding assembly is cooperated with conveying frame and conveying auger blade, it is convenient to store certain oil particle in feeding assembly inside, reduce the number of adding oil particle from outside, simultaneously, by adjusting the rotating speed of conveying auger blade, the conveying quantity is controlled, the matching accuracy is improved, simultaneously, feeding assembly is cooperated with baffle through conical hopper, it is convenient to intercept the heat and water vapor rising in mixed cylinder, avoid heat and water vapor into the inside of conveying frame, cause the oil particle stored in the inside of conveying frame to melt, influence subsequent conveying of oil particle.

The invention discloses an online pretreatment process for reducing the content of cell wall substances of tobacco stems, which comprises the following steps: (1) cleaned tobacco stems are added into high-pressure stem moistening equipment for steam explosion, and the steam explosion pressure is not greater than 2bar; (2) pressing and cutting the tobacco stems subjected to steam explosion to form cut stems; (3) adding a biological compound preparation into the cut stems for fermentation treatment; the biological compound preparation at least comprises cellulase, pectinase, laccase and ligninase. According to the method, the tobacco stems are subjected to steam explosion pretreatment under specific conditions, so that the structure of the tobacco stems is looser, meanwhile, the content of cell wall substances such as lignin is obviously reduced, the wood gas and irritation of the tobacco stems are reduced in combination with a specific fermentation process, and the cigarette product modified by adding the cut stems is free of irritation and offensive odor, smooth in smoke and high in smoking evaluation quality.

The invention relates to the field of microbial fermentation, in particular to a saccharification and liquefaction bifunctional recombinant yeast strain as well as a construction method and application thereof. The invention provides a recombinant yeast strain with saccharification and liquefaction dual functions, and the recombinant yeast strain has better clinker fermentation and raw material fermentation capabilities through co-expression of high-enzyme-activity alpha-amylase and glucoamylase genes. Under the conditions of clinker fermentation and raw material fermentation, the fermentation alcohol content of existing strains can be improved, addition of exogenous enzymes is reduced, cost reduction and yield increase of biological raw material ethanol can be achieved, and the large-scale industrial production requirement is met.

The utility model relates to circulating device field especially relates to a numerical control lathe swarf liquid circulating device, including the recycling box and the circulating component, the inside installation of recycling box is used for the recycling recycling use of fully processing swarf liquid circulating component, and the circulating component includes the composite filter screen, storage bin, liquid outlet pipe, docking disc, filter ring, solenoid valve, connecting plate, recycling disc, charging frame, and the inside of recycling box is provided with recycling groove, and the inside symmetry of recycling groove is equipped with the composite filter screen, and the outer end corner of composite filter screen is equipped with the limiting bolt, and the composite filter screen is fixed with recycling box thread through limiting bolt, and the inside of recycling box is located composite filter screen one side and is provided with storage bin, and the inner wall symmetry of recycling groove is provided with multiple groups of guide grooves, the utility model discloses through adopting the composite filter screen to the multistage full filtration separation of swarf liquid, effectively screens out the swarf in cutting fluid, reduces the residual of metal scrap in recycling cutting fluid, guarantees the cleanness of recycling cutting fluid, improves the filtration effect.

The application discloses an adjustable warehouse-dividing conveying and opening production line for water-jet non-woven fabric, which comprises two weighing machines, two mixing warehouses, and an adjustable conveying pipeline connecting the weighing machine group and the mixing warehouses; one end of a first conveying pipeline and a second conveying pipeline is respectively connected with different weighing machines, and the other end is respectively connected with different mixing warehouses; a reversing device is arranged on the second conveying pipeline; one end of a third conveying pipeline is connected with the weighing machine, and the other end is connected with the reversing device; the second conveying pipeline and the third conveying pipeline can be replaced with each other through the reversing device; the first conveying pipeline and the second conveying pipeline are combined to be used for fiber conveying, so that an AA surface double-layer structure can be formed; the first conveying pipeline and the third conveying pipeline are combined, so that an AB surface structure is formed; the reversing device is cut back to the second conveying pipeline, so that the AA surface double-layer structure can be quickly switched, the production line is convenient and fast, the addition of other auxiliary equipment is reduced, the cost and labor are reduced, the flexibility is high, and product diversification is achieved.

The application discloses a genetically engineered bacterium with high ergothioneine yield and a construction method and application thereof. The genetically engineered bacterium is a recombinant microorganism with the following characteristics or changes in a host for ergothioneine production: (1) overexpression of betaine homocysteine methyltransferase BHMT; (2) overexpression of ergothioneine synthase EgtE, EgtD and Egt1; and (3) knockout of spermidine synthase gene spec and tRNA methyltransferase gene trmB in the genome. In the fermentation production of ergothioneine, the genetically engineered bacterium is supplemented with betaine, and the addition of methionine is reduced. The utilization rate of methionine reaches more than 70%, and the yield of ergothioneine reaches more than 10 g / L, thereby providing a new scheme with improved economy for the industrial production of ergothioneine.

The invention provides a method for recycling phosphorus in excess sludge by using carbide slag, and belongs to the technical field of solid waste recycling. The method specifically comprises the following steps: S1, pretreating urban excess sludge; s2, carrying out acid leaching reaction on the urban residual sludge to obtain an acid leaching solution; s3, preparing a carbide slag solution; and S4, mixing the acid leaching solution obtained in the step S2 with the carbide slag solution obtained in the step S3 to extract phosphorus. In the step S4, the supernatant of the carbide slag solution is mixed with the acid leaching solution to generate aluminum phosphate precipitate, and the aluminum phosphate precipitate is filtered and recycled; or aluminum removal resin can be used for removing aluminum in the acid leaching solution, then the acid leaching solution and the carbide slag supernate are mixed and react to generate calcium hydrogen phosphate, and the calcium hydrogen phosphate is filtered and recycled. The method provided by the invention has good phosphorus recovery efficiency and low recovery cost, adopts the excess sludge of a sewage treatment plant and the waste carbide slag of a chemical plant as raw materials, realizes resource utilization of the sludge and the carbide slag, and achieves the purpose of treating waste with waste.

This invention discloses a method, apparatus, storage medium, and computer device for processing question-answering tasks, relating to the field of natural language processing technology. Its main objective is to address the problem of poor processing effectiveness in existing question-answering tasks. The method includes: upon detecting the execution of a question-answering task, parsing the question-answering information; retrieving a pre-trained question-answering recognition model based on the question-answering information (the model is trained by filtering prompts added to each network layer based on their importance); processing the question-answering information using the recognition model to obtain the recognition result of the question-answering task and acquiring evaluation information matching the recognition result; when there is prompt information matching the evaluation information that needs updating, updating the prompt information based on the prompt information to be updated, and adjusting the question-answering recognition model matched to the question-answering task based on the updated prompt information.

This application pertains to the field of waste battery recycling and discloses a method, apparatus, and product for recycling positive and negative electrode materials from waste lithium-ion batteries. Specifically, it involves pre-treating waste lithium-ion batteries to obtain a mixture of positive and negative electrode materials, and then mixing the mixture with a eutectic salt to obtain a mixture to be separated. The density of the eutectic salt is 2.5 g / cm³. 3 ~3.5g / cm 3 Within a certain range; the mixture to be separated is heated to above the eutectic point of the eutectic salt, the upper solid layer is collected to obtain regenerated negative electrode material, and the lower solid layer is collected to obtain regenerated positive electrode material. This application utilizes the eutectic salt with a density between the positive and negative electrode materials, which allows the negative electrode material to float and the positive electrode material to sink, thereby effectively achieving the separation and regeneration of positive and negative electrode materials from waste lithium-ion batteries. This is beneficial for subsequent reuse and has the advantages of simple process and low cost, making it suitable for mass production.