437results about How to "High retention rate" patented technology

The invention discloses a construction method for governing and repairing desertification degraded grassland in an arid area, and relates to the technical field of sand governing. The method comprises the following steps: evaluating a native vegetation type, vegetation coverage, a soil degradation and desertification degree, a soil type and a water resource condition; performing classified measures according to natural conditions, and determining different types of dune (flowing, fixed or semi-fixed) treatment measures; construction preparation; grid sand barriers are laid on the windward sides of the moving dunes and the semi-fixed dunes, and sand stabilization operation is conducted in a mechanical and manual combined mode; digging pits to plant indigenous shrubs subjected to special treatment, and using rooting water retention bags to improve the survival rate; the granular organic fertilizer and the seeds are mixed and stirred according to a certain proportion and then sown into soil at a time, the operation frequency is reduced, and precise fertilization is achieved. Through effective sand prevention and control measures, the sand wind damage is reduced, the living environment of farmers and herdsmen is protected, and the living quality is improved.

The invention provides a preparation method of a polyester loose nanofiltration membrane, and belongs to the technical field of nanofiltration membrane preparation. The preparation method provided by the invention comprises the following steps: dissolving a water-phase monomer in a sodium hydroxide solution to obtain a NaOH solution containing the water-phase monomer; soaking an ultrafiltration membrane in the NaOH solution containing the aqueous phase monomer to obtain an ultrafiltration membrane supporting layer; contacting the ultrafiltration membrane supporting layer with a trimesoyl chloride solution, and carrying out interfacial polymerization reaction to obtain a primary nanofiltration membrane; and carrying out heat treatment on the primary nanofiltration membrane to obtain the polyester loose nanofiltration membrane. The water-phase monomer is a compound which has a non-planar distorted structure and simultaneously contains phenolic hydroxyl groups and alcoholic hydroxyl groups. The method provided by the invention is simple and easy to implement, relatively low in required cost and beneficial to realizing large-scale industrial production of the high-efficiency nanofiltration membrane. The polyester loose nanofiltration membrane prepared by the preparation method disclosed by the invention has relatively high permeation flux, and meanwhile, a relatively high Na2SO4 retention rate can be kept.

The invention discloses a rice field soil conditioner which is prepared by mixing a modified zeolite molecular sieve, a biological fertilizer, polymerized bentonite, biochar and nano zero-valent iron according to the mass ratio of (20-25): (30-35): (25-30): (15-20): (5-8), by adding the modified zeolite molecular sieve and the polymerized bentonite, fertilization nutrients in soil can be effectively adsorbed, the nutrient loss speed is greatly reduced, the soil nutrient retention rate is increased, the use of chemical fertilizers is reduced, and sustainable agricultural development is facilitated; the modified zeolite molecular sieve can absorb water at the same time and can release water in high-temperature weather, so that the soil structure is effectively improved, the water-retaining property of rice field soil is improved, and the phenomenon that planted rice is withered due to the fact that water is not supplemented in time in hot weather is avoided; and meanwhile, the combination of the nano zero-valent iron and the biochar can adsorb heavy metal ions in the soil and carry out reduction fixation, so that the heavy metal pollution in the rice field soil is reduced.

The invention relates to a papermaking wastewater fiber recovery device which is characterized in that a main water distribution channel positioned at a high position is butted and communicated with a plurality of branch water channels below through a main water distribution hole in the bottom, two rows of vertical water distribution lattice walls are arranged in each branch water channel along the length direction and divide the branch water channel into a middle chamber, a left chamber and a right chamber, and the main water distribution hole is opposite to the middle chamber; the bottom of the water distribution lattice wall is provided with an overflowing channel, the middle cavity is communicated with the left cavity and the right cavity, the weir crest portions on the two sides of the water distribution canal are provided with vertical water uniformizing plates, the outer side of the weir crest is provided with a net frame inclining downwards, inclined net cloth is laid on the net frame, and the bottom end of the net frame is provided with a horizontal chute bottom plate in the length direction. A vertical chute baffle is arranged on the extending outer side of the chute bottom plate in the length direction, and a collecting groove used for collecting fiber agglomerates is formed. Wastewater uniformly flows through the water passing surface of the inclined net, fibers are efficiently intercepted on the inclined net surface and form fiber bundle clusters to roll down under the action of inlet water washing and gravity, and slurry-water separation is realized through the action of gravity in the whole process.

The invention relates to the technical field of batteries, in particular to a battery cell and a battery comprising the same. The battery cell comprises a positive plate, a diaphragm and a negative plate, the diaphragm is located between the positive plate and the negative plate and comprises a base material and gluing layers, the gluing layers are located on the two sides of the base material or located on the side, close to the positive plate, of the base material, the battery cell comprises a straight area and a bent area, and the diaphragm comprises a first area and a second area corresponding to the straight area. The second area is an area where the diaphragm is overlapped with the projection of the positive plate, the first area is an area where the diaphragm is not overlapped with the projection of the positive plate, the thickness of the gluing layer in the first area is H1, the thickness of the gluing layer in the second area is H2, and the battery cell meets the following relational expression: 1 < H1 / H2 < = 10. The battery disclosed by the invention is high in cycling stability and good in high and low temperature performance.

The invention relates to the technical field of mulberry processing, in particular to fermented mulberry powder with sleep-aiding and sugar-resisting effects as well as a preparation method and application of the fermented mulberry powder. The preparation method comprises the following steps: adding mulberries into water, and pulping to prepare pulp; adding a compound enzyme into the slurry for enzymolysis to obtain an enzymatic hydrolysate; equally dividing the enzyme solution into two parts, and respectively adding saccharomyces cerevisiae and plant lactobacillus for first-stage fermentation to obtain a first fermentation solution; sterilizing the first fermentation liquor, and adding casei paracasei for second-stage fermentation to obtain second fermentation liquor; and filtering the second fermentation liquor, adding a solid filler into the filtrate, and then sterilizing and drying in sequence to obtain the fermented mulberry powder. Compared with common mulberry powder, the fermented mulberry powder prepared by the preparation method disclosed by the invention has the effects of aiding sleep and resisting sugar, is obvious in aiding sleep, can inhibit generation of AGEs, and has the effect of inhibiting glycosylation.

The invention relates to the field of food processing, and discloses a processing method for debitterizing and deodorizing linseed oil and efficiently retaining antioxidant nutrient linol and grease processed thereof.The method comprises the steps that 1, the linseed oil and a debitterizing agent are mixed to obtain debitterized linseed oil; (2) sequentially carrying out steam quenching and tempering treatment and deodorization treatment on the linseed oil to obtain deodorized linseed oil; wherein the temperature of the deodorization treatment is 45-100 DEG C higher than that of the water vapor quenching and tempering treatment. According to the method, bitter and fishy substances in the linseed oil can be efficiently removed, meanwhile, the loss of alpha-linolenic acid, linolenol (containing tocopherol, PC-8 and polyphenol) and sterol in the linseed oil is reduced, the retention rate of the alpha-linolenic acid, linolenol and sterol in the linseed oil is increased, and then the quality of the linseed oil is improved.

The invention provides a preparation method of low-sodium hollow salt capable of dietary supplement of astaxanthin, which comprises the following steps: dissolving haematococcus pluvialis protein and food-grade polysaccharide in water, adjusting pH and stirring to obtain a compound solution; adding NaCl and oil into the compound solution, carrying out high-speed dispersion, and carrying out high-pressure homogenization treatment, so as to obtain an oil-in-water Pickering emulsion; the oil-in-water Pickering emulsion is subjected to spray drying, and the low-sodium hollow salt loaded with the astaxanthin is obtained. The low-sodium hollow salt capable of dietary supplement of astaxanthin does not contain any surfactant, and the sodium reduction effect of 30-50% can be achieved; the astaxanthin is encapsulated in the oil phase, so that the problems of poor water solubility, low bioavailability and the like of the astaxanthin are solved, and daily dietary supplement of the astaxanthin is increased; under long-term storage, the low-sodium hollow salt has good astaxanthin retention rate and lipid oxidation stability; the oil oxidation of the fried steak can be effectively prevented, and the food quality can be maintained.

The invention provides a preparation method of a heteroatom-doped mesoporous carbon nanotube material and application of the heteroatom-doped mesoporous carbon nanotube material in a lithium-sulfur battery. The preparation method comprises the following steps: S1, preparing a polyphosphazene nanotube by utilizing a self-template method; s2, preparing PZS coated SiO2 by adopting a sol-gel method; s3, NPS-C coated SiO2 is prepared through carbonization; and S4, adding the NPS-C-coated SiO2 powder into an etching solution, stirring, centrifuging, washing, and finally performing vacuum drying at room temperature to obtain the NPS-C material. The NPS-C obtained by carbonizing the precursor prepared on the basis of a self-template method and a sol-gel method has excellent conductivity, the mesoporous hollow structure can be used as a sulfur species packaging framework to inhibit large volume fluctuation in the circulation process, heteroatoms can adsorb and fix polysulfide to effectively inhibit the shuttle effect, and the performance of the NPS-C is improved. And a new thought is opened up for exploration and design of the high-performance electrode material of the lithium-sulfur battery.

The invention relates to the technical field of milk sterilization systems, in particular to an intelligent microwave-heat exchange composite milk sterilization system and a method thereof.The system comprises a mixing module used for adjusting the flow speed and temperature of fresh milk; the microwave sterilization module is used for heating milk by using a multi-frequency magnetic field; the temperature control module comprises a microwave power regulator and a heat exchanger and is used for regulating the microwave heating time and the heat exchange rate so as to control the milk temperature; and the digital twin module optimizes the sterilization process by using deep reinforcement learning and simulates the system performance in a virtual environment, and a faster and more uniform heating process is realized through the synergistic effect of microwaves and heat exchange. The application of the multi-frequency magnetic field technology further improves the uniformity of microwave heating, and effectively solves the problems of hot spots and cold spots in traditional heat exchange sterilization. Experimental results show that compared with a traditional method, the sterilization effect is improved by about 11.5%, which means higher food safety.

The invention relates to the technical field of carbon nanomaterials, in particular to a single-walled carbon nanotube purification method. Introducing a solvent into the initial sample of the single-walled carbon nanotube: putting the single-walled carbon nanotube with the mass A into a container, adding the solvent with the mass B, and fully stirring to obtain a wet material; low-temperature oxidation in a strong oxidizing atmosphere: putting the wet single-walled carbon nanotube material into a reactor, continuously introducing inert gas, heating the reactor to a relatively low temperature T1, introducing strong oxidizing gas after the temperature is stable, and stopping introducing the strong oxidizing gas after reacting for a certain time; and acid treatment: dispersing the obtained sample into an acid solution, stirring for reaction, and then filtering and drying to obtain the purified single-walled carbon nanotube. According to the method, the purification efficiency, retention rate and purity of the single-walled carbon nanotubes are greatly improved.

The invention provides a method for improving yield and tree vigor balance of grafted Korean pine cones in a semi-arid region, and belongs to the technical field of forest cultivation. In the semi-arid region, 2-3 annual cones are uniformly reserved on bearing branches of Korean pine different-stock grafted young trees which are grafted for more than 4 years and are in the early stage of fruiting; selecting medium and large fruit type scion-picking seed trees; collecting medium and large fruit type scions, and storing at low temperature; selecting pinus sylvestris or pinus tabulaeformis branches as stocks for different-stock grafting; or selecting a partial female Korean pine grafting branch as a stock to perform different-stock grafting or same-stock grafting, and starting stock cutting and unbinding, shaping and pruning and timely fruit thinning from the next year after grafting survival according to a cultivated target tree shape. Through selection under the extreme drought condition, the scion stress resistance is enhanced, and the preservation rate of the Korean pine different-stock fruit forest in the semi-arid region is improved; the pollen amount of medium and large fruit type scion Korean pine is increased, and the proportion of full seeds in cones is improved. The fruit thinning strength in the red pine fruiting period is reduced, and the red pine cones picking efficiency is improved.

The invention discloses a preparation method of a self-assembled cellulose diaphragm, a membrane prepared by the self-assembled cellulose diaphragm and application of the self-assembled cellulose diaphragm. The preparation method comprises the following steps: mixing a solvent solution containing cellulose and zinc salt with a solvent solution containing a microporous material, ultrasonically crushing, and forming a membrane to obtain the self-assembled cellulose diaphragm, the cellulose is selected from cellulose nanofibers and / or cellulose nanowires; after the cellulose and the microporous material are uniformly dispersed in the solution, a film-forming base solution of the self-assembled diaphragm can be formed without adding any binder in the film-forming process, and the self-assembled diaphragm has a good film-forming effect. The composite diaphragm provides an effective channel, promotes the transmission of zinc ions in the battery, has smaller internal resistance than a traditional diaphragm, has high electrolyte preservation rate, is smaller than the traditional diaphragm in thickness, and can improve the energy density and cycle performance of the battery. The preparation process of the diaphragm is simple, the reaction condition is mild, the preparation period is short, and the diaphragm is suitable for large-scale industrial production and commercial application.

The invention discloses a reverse osmosis membrane based on tannic acid solution activation and hydrophilic compound surface modification and a preparation method thereof, and belongs to the technical field of composite reverse osmosis membrane preparation. The method comprises the following steps: after an interfacial polymerization reaction is finished, activating an RO membrane by adopting an aqueous solution containing tannic acid (TA); and meanwhile, a hydrophilic compound is selected to carry out surface modification on the activated RO membrane. The unique molecular structure of the TA can improve the surface structure of the RO membrane to improve the selective permeability of the membrane on one hand, and on the other hand, in the surface modification process, more anti-pollution groups can be fixed on the surface of the RO membrane in the presence of the TA, so that the anti-pollution performance of the RO membrane is improved, the activated RO membrane is subjected to surface modification by selecting a hydrophilic compound polyethylene glycol (PEG), and the anti-pollution performance of the RO membrane is improved. A smooth hydrophilic coating is added to the surface of the RO membrane through PEG modification, so that the selective permeability and the anti-pollution performance of the membrane are improved.

The invention relates to the field of electronic cigarette liquid, and provides high-stability nicotine salt, a preparation method and electronic cigarette liquid thereof, and the nicotine salt is prepared from the following components in parts by weight: 40-60 parts of nicotine, 10-18 parts of organic acid, 3-7 parts of gallic acid grafted chitosan, 4-8 parts of a tea polyphenol / cyclodextrin inclusion compound, 2-6 parts of vesicle coated anthocyanin and 40-60 parts of propylene glycol. The preparation method of the nicotine salt comprises the following steps: mixing organic acid and propylene glycol, heating in a water bath, and stirring to prepare a uniform solution; adding nicotine into the solution, heating and strongly stirring to prepare a nicotine solution; and then adding gallic acid grafted chitosan, a tea polyphenol / cyclodextrin inclusion compound and vesicle coated anthocyanin, uniformly stirring, and freeze-drying to obtain the high-stability nicotine salt. The gallic acid grafted chitosan, the tea polyphenol / cyclodextrin inclusion compound and the vesicle coated anthocyanin solve the problems of insufficient stability and inoxidizability of nicotine salt.

The invention discloses a multidimensional salt separation system and a multidimensional salt separation method. The multidimensional salt separation system comprises a softening and silicon removal device, a sodium chloride evaporation crystallization device, a sodium sulfate freezing crystallization device, a melting crystallization device and a multi-stage nanofiltration device; the multi-stage nanofiltration device comprises a primary nanofiltration unit, a secondary nanofiltration unit and a tertiary nanofiltration unit, the primary nanofiltration unit, the secondary nanofiltration unit and the tertiary nanofiltration unit are sequentially connected in series, the primary nanofiltration unit is also connected with the tertiary nanofiltration unit to realize that the primary nanofiltration concentrated water of the primary nanofiltration unit enters the tertiary nanofiltration unit, and the tertiary nanofiltration produced water of the tertiary nanofiltration unit also enters the secondary nanofiltration unit, the softening and silicon removal device is connected with the primary nanofiltration unit, the secondary nanofiltration unit is connected with the sodium chloride evaporation crystallization device, the sodium sulfate freezing crystallization device is connected with the tertiary nanofiltration unit, and the melting crystallization device is connected with the sodium sulfate freezing crystallization device. The multidimensional salt separation system of the invention has good salt separation effect, high purity of by-product salt and low impurity salt rate.

The invention discloses an anti-pollution ultrafiltration membrane and a preparation method thereof, and relates to the technical field of organic polymer materials. The anti-pollution ultrafiltration membrane is prepared from the following raw materials by weight: 80 parts of hydrophilic modified polyethersulfone, 2-4 parts of coupling agent, 3-5 parts of Al-Nb-Sc-O-Te, 15-25 parts of additive, 5-8 parts of polyethylene glycol diacrylate, 2-4 parts of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt, and 3-5 parts of 1-allyl-3-vinyl imidazole chloride; the hydrophilic modified polyethersulfone is trishydroxymethylaminomethanesulfonic acid modified polyethersulfone. The anti-pollution ultrafiltration membrane has good anti-pollution performance, sufficient pure water flux, and high BSA retention rate.

The invention provides a large model cue word compression method based on dynamic budget allocation. The method aims at optimizing the cue word length of a large language model so as to improve the calculation efficiency of the model and reduce the calculation cost. Through cooperative work of the dynamic budget distributor and the vocabulary selector, the cue words can be compressed on the premise of ensuring semantic integrity. Firstly, a dynamic budget distributor dynamically distributes a vocabulary retention budget of each sentence based on the correlation between each sentence and a question; then, the vocabulary selector calculates the retention probability of each vocabulary through the strategy network, and key vocabularies are preferentially retained; and evaluating loyalty and similarity of compression prompts through a reward function module, and guiding a strategy gradient to update network parameters. According to the method, the performance of the large language model is remarkably improved, and the method is suitable for prompt optimization in scenes such as multi-round dialogues and long text analysis.

The invention discloses a planting method of selenium-rich cherries. The planting method comprises the following steps that selenium-containing fertilizer is applied to soil in a flushing mode when tree bodies germinate at the end stage of a dormancy period; in the flowering stage, nitrogen-phosphorus-potassium balanced fertilizer is applied, and the synergist composition and the selenium-enriched nutritional agent are sprayed on leaf surfaces at intervals; and spraying the synergist composition and the selenium-rich nutritional agent on leaf surfaces at intervals for multiple times in a fruit swelling period. The synergist composition disclosed by the invention is prepared from the following components: polyoxyethylene fatty alcohol ether, polyether modified organic silicon, natural plant saponin, chitosan oligosaccharide, alginic acid, hydrolyzed collagen and the like. The selenium content of the cherry fruits cultivated by the method can reach 0.078-0.082 mg / kg, after the cherry fruits are stored for 15 days, the hardness of the fruits is maintained at 65-68.5 N / cm < 2 >, the weight loss rate is controlled at 4.0-4.5%, the rotting rate is controlled at 3.2-3.8%, the retention rate of vitamin C reaches 83-86%, and the storage period is prolonged by 3-4 days compared with that of conventional cultivation. The method is easy to operate, low in cost and high in applicability, and the quality and storage performance of the cherry fruits can be remarkably improved.

The invention discloses a process for preparing a liquid fertilizer from high-purity tryptophan fermentation waste liquid, and relates to the technical field of fertilizer preparation, and the process comprises the steps of pretreatment of tryptophan fermentation liquid, concentration of the fermentation waste liquid, component optimization and stabilization treatment. The first filtering operation can remove suspended particles and macromolecular impurities in the waste liquid, the second filtering operation can remove macromolecular substances such as protein aggregates and polysaccharides in the waste liquid, meanwhile, the light transmittance of the waste liquid is improved, and the recovery rate of tryptophan is improved. A low-frequency pulse electromagnetic field is applied into the fermentation tank, so that the permeability of microbial cell membranes can be enhanced, the uptake of microorganisms to substrates and the secretion of metabolites can be promoted, the fermentation efficiency can be improved, and the fermentation time of tryptophan fermentation liquor can be shortened.

The invention discloses a preparation method of a double-emulsion microcapsule for improving the light stability of vitamin B12 in soft sweets. By constructing a double emulsion system, seepage of the vitamin B12 is effectively prevented, meanwhile, solid fat in an oil phase can effectively block damage of external ultraviolet rays to the vitamin B12, and the storage stability of the vitamin B12 is remarkably improved. In addition, the microcapsule is easy to disperse in water due to the selected water-soluble outer-layer wall material, so that the preparation of the soft sweets is facilitated. And the preparation process is simple and easy for large-scale production. The encapsulation efficiency of the vitamin B12 microcapsule prepared by the method is more than 65%. And the retention rate of the vitamin B12 can reach more than 60% after the vitamin B12 is stored for 28 days under a room-temperature illumination condition, which is obviously superior to the retention rate of the raw materials.

The invention discloses a method for cultivating plant-growing concrete seedlings of red sea olive, which comprises the following steps of: fixing seeds of red sea olive in a plant-growing concrete seedling-growing tube, and then directly and vertically planting the plant-growing concrete seedling-growing tube on a field mud flat wetland for natural seedling cultivation. The vegetation concrete seedling raising pipe is formed by pouring seed germination concrete on the upper layer and seedling breeding concrete on the lower layer in the seedling raising pipe in a laminated mode. Wherein the seed germination concrete and the seedling breeding concrete are prepared from sea mud, sea sand, cement, seawater and fertilizer according to different dosage ratios. According to the method, the three functions of seed germination, seedling breeding and field planting application can be achieved in the same device, and the cultivation rate, the survival rate and the retention rate of the natural seedlings of the red sea olive can be remarkably increased.

The invention discloses a recombinant I-type human collagen, hydrogel and application of the recombinant I-type human collagen and the hydrogel in preparation of a medical beauty filler. The recombinant I-type human collagen with high content of isopeptide bonds and nanocellulose are prepared into the composite hydrogel, and the composite hydrogel has the advantages of high stability, low swelling, high weight guarantee rate, strong adhesive force and hemostasis capability, and has the potential of being used as a skin tissue repair material. And the composite hydrogel can be used for repairing burnt skin, obviously reducing inflammatory response of the burnt skin and promoting wound healing. Besides, the composite hydrogel can also be used as a filler or an inhibitor to be filled in a mouse body, has relatively low inflammatory response, can promote collagen synthesis in the mouse body, can promote blood vessel and bone cell generation through long-term action, further promotes tissue neogenesis, and provides a technical basis for serving as a medical beauty filling material.

The invention provides a field returning method of myricaria laxiflora, which comprises the following steps: planting myricaria laxiflora plants in a returning manner by taking a sandy beach land as a returning point, and in the sandy beach land, the flood period flooding time is less than or equal to 5 months, the annual rainfall is 1000-1200 mm, the altitude is 40-150 m, the annual average temperature is 17-19 DEG C, the annual minimum temperature is more than or equal to-9 DEG C, and the annual maximum temperature is less than or equal to 42 DEG C. According to the field regression method, the flooding resistance and washing resistance of the myricaria laxiflora can be improved, and the survival rate and the preservation rate of field regression of the myricaria laxiflora can be increased.

The invention provides a paper product, papermaking pulp, papermaking filler and a preparation method thereof. The preparation method of the papermaking filler comprises the following steps: preparing an aqueous solution of ground calcium carbonate; adding a first cation coating reagent to the solution; adding microfibrillated cellulose to the solution; and adding a second cation coating reagent to the solution. According to the preparation method of the papermaking filler provided by the embodiment of the invention, the filler is pre-flocculated by adopting a ternary coating technology (the first cation coating reagent is firstly added, then the microfibrillated cellulose is added, and finally the second cation coating reagent is added), so that the retention rate and the paper sheet strength of the filler can be greatly improved; in addition, the influence of the polyhydroxy characteristic of the microfibrillated cellulose on water filtration of paper sheets can be reduced, and the hydroxyl combination effect between fibers can be fully exerted.

The invention belongs to the field of chemical recovery of waste plastics, and discloses a method for preparing monocyclic aromatic hydrocarbon from styrene derived waste plastics. A catalyst and waste plastics are uniformly mixed and then are loaded into a high-pressure reaction kettle, no extra solvent needs to be added, gas generated by the reaction is collected through a gas bag after the reaction is finished, and a liquid product and residual solids are centrifugally separated. In the method, the catalyst is simple to prepare, low in cost and good in stability, the styrene-derived waste plastics can be efficiently converted into monocyclic aromatic hydrocarbons such as methylbenzene and ethylbenzene under the solvent-free and mild conditions, and the conversion rate can reach 90% or above. According to the method, efficient chemical recovery of the styrene-derived waste plastics is realized, and a solution is provided for recovery and utilization of the styrene-derived waste plastics.

The invention relates to the technical field of storage and preservation of agricultural products, in particular to micro-nano ozone ice as well as a preparation method and application thereof. The micro-nano ozone water is prepared by mixing ozone and water at a high speed by using a Venturi ejector. And refrigerating the micro-nano ozone water with the temperature of 2-5 DEG C by using a salt solution (such as NaCl and CaCl2 solutions) with the temperature of-20 DEG C to-40 DEG C as a medium to prepare the micro-nano ozone ice. The process is simple, the refrigeration efficiency is high, and the ozone retention rate is high. Experiments show that the ozone retention rate reaches up to 48.77%, which is much higher than that of the traditional process and contrast. The micro-nano ozone ice is applied to precooling of the litchis, and compared with traditional ice water precooling, the fruit peel browning can be remarkably reduced, and the quality is improved.

The invention discloses an impurity removal method for waste lithium iron phosphate black powder pickle liquor, and belongs to the field of waste lithium iron phosphate battery recycling. The method comprises the steps that waste lithium iron phosphate black powder is selectively leached with acid and an oxidizing agent, and leaching liquor containing iron and copper impurities is obtained; according to the method disclosed by the invention, a selective leaching process is firstly adopted, so that the concentration of an impurity iron element in the leachate is reduced while the lithium is efficiently extracted. Then a precipitation method is adopted, the concentration of a precipitator and precipitation conditions are regulated and controlled, iron and copper ions can be removed through one-step precipitation, step-by-step impurity removal is not needed, meanwhile, the high lithium retention rate is achieved, the obtained high-purity lithium-rich solution can be used for preparing lithium carbonate and other high-added-value lithium salt products, the process technology is simple, and the potential of large-scale utilization is achieved.

The invention belongs to the technical field of batteries, and particularly relates to a manganese phosphate positive electrode material and a preparation method and application thereof. Comprising the following steps: preparing raw material components into a primary mixed material, wherein the mass percentage of an initial carbon source in the raw material components is 1%-3%; carrying out primary sintering treatment; according to the carbon content in the primary sintering material and the target carbon content in a finished product, calculating the amount of a carbon source needing to be supplemented, and preparing a secondary mixed material; and after secondary sintering treatment, crushing to obtain the manganese phosphate positive electrode material. The carbon sources respectively and independently comprise a polymer carbon source and a short-chain carbon source. By adding the mixed carbon source step by step and controlling the amount of the carbon source added before one-time sintering, the coating uniformity and graphitization degree of the carbon layer are improved, free carbon in the finished product is reduced, and the properties of compaction, specific surface area, conductivity, manganese plateau retention rate and the like of the finished product are improved. Wherein the mixed carbon source not only can realize uniform carbon layer coating, but also has relatively good electronic conductivity.

The embodiment of the utility model provides an anaerobic biofilm reaction device, and relates to the technical field of wastewater treatment. The anaerobic biofilm reaction device comprises a reactor body, wherein a feeding pipe, a gas outlet pipe and a sludge discharge pipe are arranged on the reactor body; the solid-liquid separation mechanism is arranged outside or inside the reactor body, the solid-liquid separation mechanism is provided with an input end, a liquid phase output end and a solid phase output end, and the solid phase output end is communicated with the inside of the reactor body; and the driving mechanism is used for conveying the mixed liquid in the reactor body into the solid-liquid separation mechanism along the input end, so that the solid-liquid separation mechanism performs solid-liquid separation on the mixed liquid. The anaerobic biofilm reaction device adopts the solid-liquid separation mechanism to perform active solid-liquid separation on the mixed liquid, so that the wastewater treatment efficiency is improved.