35 results about "Pulse microwave" patented technology

The invention discloses a composition for assisting in reducing blood sugar and blood fat as well as a preparation method and application thereof, and relates to the technical field of functional compositions. The composition comprises highland barley powder and modified inulin, the preparation method of the highland barley powder comprises the following steps: soaking highland barley grains in a weakly alkaline aqueous solution, and sequentially carrying out first pulse microwave treatment, enzyme deactivation treatment and segmented baking treatment; the segmented baking treatment comprises first-stage baking treatment and second-stage intermittent infrared irradiation treatment; the temperature of the first-stage baking treatment is 40-60 DEG C; the temperature of the second-stage intermittent infrared irradiation treatment is 60-80 DEG C, and the emission wavelength is 2.5-4 microns; the preparation method of the modified inulin comprises the following steps: performing acidolysis treatment on inulin in a weakly acidic aqueous solution, and then drying. The highland barley powder and the modified inulin in the embodiment can synergistically improve glycometabolism and lipid metabolism, effectively reduce the body weight, blood sugar, blood fat and the like under high-glucose and / or high-fat diet, and protect and repair the pancreas islet function.

The invention relates to the technical field of polysaccharide extraction, and discloses a method for extracting high-purity pectin through cooperation of pulse microwave and low temperature, which comprises the following steps: applying a microsecond-level microwave pulse sequence corresponding to inherent acoustic resonant frequency of raw material particles, and monitoring net absorption power and acoustic signals on line, so as to adaptively control frequency locking and pulse form in a closed-loop manner; according to the invention, the electromagnetic energy of microwaves is converted into instantaneous mechanical work, and efficient structural damage to the plant cell walls from inside to outside is realized through a resonant coupling effect on the premise of maintaining the low temperature of the system; the online self-adaptive closed-loop control mechanism ensures the whole-process optimization of the energy coupling efficiency and the process stability, so that the inherent contradiction that the product quality and the extraction efficiency are difficult to consider at the same time in the traditional extraction technology is solved.

The invention discloses high-purity nickel powder prepared from plant polyphenol through field flow control, a system and a method, a sulfonated tannic acid-gallic acid bio-based system is used as a reduction-stabilizer, and green and efficient preparation of nickel nano powder is realized through a multi-physical field synergistic effect of a three-stage gradient continuous flow reactor and double-frequency ultrasonic-pulse microwave-nitrogen bubbling. The total residence time of the reaction is 25.1-37.7 min, mother liquor is reused after being subjected to salt separation treatment (nanofiltration desalination of a NiSO4 system and ion exchange Cl removal of a NiCl2 system), and the wastewater discharge amount is greatly reduced compared with that of a traditional process; the surface oxygen content of the product is smaller than or equal to 0.9 wt%, the PDI is smaller than or equal to 0.15, the tap density is larger than or equal to 4.0 g / cm < 3 >, the GB / T 33828-2017 standard is met, the method can be used for the high-end field of lithium ion batteries and the like, and green industrial production of the nanometer nickel powder is achieved from the source.

The utility model relates to the technical field of liquid detection, in particular to a liquid detector which comprises a shell, a non-metal container detection platform and a metal container detection cavity are arranged at the top of the shell, and a non-metal container detection module is arranged in the non-metal container detection platform. The nonmetal container detection module comprises an ultra-wide-band pulse microwave transmitter and an ultra-wide-band pulse microwave receiver, a metal container detection module is arranged in the metal container detection cavity and comprises an electric heater and a thermoelectric sensor, and a first indicator lamp and a second indicator lamp of a touch operation screen are arranged on the front side of the shell. A detachable bottom plate is arranged at the bottom of the shell, and four leveling pieces are arranged at the bottom of the bottom plate. According to the liquid detector, a non-contact detection method is adopted, and a container is prevented from being opened for sampling, so that the risk of leakage, evaporation or explosion of flammable and explosive liquid is remarkably reduced, the safety of operators is ensured, and potential threats to the surrounding environment are also reduced.

The invention provides a flaxseed meal dietary fiber preparation method and application thereof.The flaxseed meal dietary fiber preparation method comprises the following steps that firstly, flaxseed meal pulp is subjected to high-power pulse microwave pretreatment, after vacuum drying, bacillus subtilis K6 is inoculated for solid-state fermentation, then double enzymolysis is conducted through amylase and protease, and the flaxseed meal dietary fiber is obtained; soluble dietary fibers and insoluble dietary fibers are extracted, the insoluble dietary fibers are subjected to compound modification through rutin and betaine, and the soluble dietary fibers are extracted through adsorption and purification of composite surface imprinted microspheres. The method obviously improves the yield and purity of the soluble dietary fibers in the flaxseed meal, the activity function of the insoluble dietary fibers is obviously enhanced after the insoluble dietary fibers are subjected to composite modification, and the flaxseed meal can be used for developing functional food or health care products. The method disclosed by the invention is green, environment-friendly, stable in process and suitable for large-scale production, and the comprehensive utilization value of the flaxseed meal is effectively improved.

The application relates to the technical field of magnetic field imaging, in particular to a fast magnetic field imaging method based on diamond NV color center coherent regulation. In order to solve the problem that the existing diamond NV color center-based magnetic field imaging method is complex to operate, a new fast magnetic field imaging method based on diamond NV color center coherent regulation is provided, and the method comprises the following steps: 1) setting the frequency of pulsed microwaves; 2) setting a synchronous control sequence, collecting fluorescence intensities of diamond NV color centers at different positions in a two-dimensional space; 3) drawing Rabi curves about time-fluorescence intensity corresponding to the different positions of the diamond NV color centers in the two-dimensional space; 4) obtaining actual angular frequencies corresponding to each Rabi curve; 5) calculating the magnetic field strength variation of the diamond NV color centers at different positions in the two-dimensional space; and 6) realizing magnetic field imaging. The method realizes the target of fast magnetic field imaging.

The invention provides a preparation method of photovoltaic potassium hydroxide, and relates to the technical field of potassium preparation. The method comprises the following steps: carrying out vacuum gradient crystallization on a KOH raw material to realize crude purification, carrying out centrifugal separation on wet crystals generated after crude purification, dissolving, carrying out three-stage counter-current extraction to obtain photovoltaic-grade KOH, extracting mother liquor generated after crude purification, and circularly carrying out vacuum gradient crystallization; dissolving the wet crystals in ultrapure water to prepare a KOH solution, filtering the KOH solution, enabling the KOH solution and an extracting agent to enter a three-stage counter-current extraction tower for three-stage counter-current extraction, carrying out nanofiltration and ultrafiltration on an output raffinate phase to obtain a photovoltaic-grade KOH product, and regenerating an output loaded organic phase to realize recycling; a microwave generating device is arranged on the three-stage counter-current extraction tower and is used for applying pulse microwaves to the mixing area in the tower. The sodium removal rate is increased, the solvent consumption is reduced, and the generation of hazardous wastes is reduced.

The invention provides a heating process for asphalt waste material fiber regeneration. The heating process for fiber regeneration of the old asphalt material comprises the following steps: S1, preheating the old asphalt material containing fibers in a reverse-flow waste heat exchanger to obtain a preheated old material; s2, the preheated old material is placed in a microwave heating cavity to be subjected to double-frequency pulse microwave heating; and S3, while the double-frequency pulse microwave heating is performed, nitrogen containing a silane coupling agent is atomized and introduced into the heating cavity through a gas atomization device, so that the coupling agent is subjected to in-situ hydrolysis and polymerization on the surface of the fiber to form the nano-scale protective coating. According to the heating process for regenerating the old asphalt material fibers, target type heating of the asphalt matrix and the fibers is achieved, the heating efficiency is improved by at least 20%, meanwhile, it is ensured that the old material reaches the regeneration temperature within the shortest time, the process period is remarkably shortened, energy consumption is reduced, and the bonding characteristic of asphalt is recovered; and finally, the high-quality regenerated material with stable performance, crack resistance and durability is obtained.

The utility model provides a microwave atmosphere furnace for simulating meteorite impact fusion pulse and cold contraction crack, and belongs to the technical field of planet impact meteology. The atmosphere furnace comprises a reaction furnace, a pulse modulation assembly and an air pump assembly. The reaction furnace is provided with a reaction cavity, and a meteorite sample is arranged in the reaction cavity. The pulse modulation assembly is connected with the reaction furnace, and the pulse modulation assembly is configured to output pulse microwaves to the interior of the reaction cavity so as to heat the aerolite sample to a molten state. The gas pump assembly is communicated with the reaction cavity, the gas pump assembly comprises a vacuum pump and a gas pump, the vacuum pump is configured to suck the reaction cavity to a vacuum state so that the aerolite sample can be heated to a molten state in the vacuum state, and the gas pump is configured to spray inert gas into the reaction cavity so as to cool the aerolite sample in the molten state. The atmosphere furnace disclosed by the utility model is beneficial to more accurately simulating the fusion evolution process after aerolite impact.

The application discloses an S-band high-power pulsed magnetron and belongs to the field of vacuum electron devices. The device comprises an anode assembly, a cathode assembly, an input assembly, an output assembly and a permanent magnet. The application adopts an axial output structure, improves the sizes and proportions of the anode and the cathode, simultaneously increases the anode voltage, adopts the permanent magnet to provide a constant magnetic field, and can output a pulsed microwave power of more than 100kW on the basis of a small size.

The invention relates to a hepatocyte growth-promoting factor preparation and a preparation method thereof, and belongs to the technical field of medicines. In order to solve the problems of low cell disruption efficiency, large polypeptide activity loss and long freeze-drying period in the existing hepatocyte growth-promoting factor preparation process, the invention provides a preparation method of a hepatocyte growth-promoting factor preparation, which comprises the steps of raw material pretreatment, low-temperature plasma cell disruption, compound protective agent compounding and pulse microwave freeze-drying. According to the method, an argon-oxygen mixed low-temperature plasma crushing technology is adopted, and the cell breakage rate of 99.7% can be achieved only in 10 min; a mannitol + proline + trehalose composite protective agent system is adopted, so that the activity index of the polypeptide is increased by 15.4%, and the validity period of the product is prolonged to 24 months; by adopting the process coupling design of plasma rapid crushing and pulse microwave rapid freeze-drying, the total production period is shortened to 12.5 hours from 30-36 hours of the traditional process, and the production efficiency is improved by more than 60%.

The invention provides an electromagnetic narrow pulse high-precision power measurement system and measurement method, the measurement system is provided with a standard horn antenna and a microwave power measurement device, and the microwave power measurement device is connected with the standard horn antenna through a radio frequency cable; the measurement method comprises the steps of calibration source full-temperature output power calibration, wired link insertion loss measurement, calibration signal digital acquisition processing, electromagnetic narrow pulse signal acquisition processing and electromagnetic narrow pulse power calculation. The method is more suitable for power measurement of narrow pulse microwave signals, eliminates the influence of temperature on power measurement, can provide powerful support in military application and civil application, and has wide and important application prospects and value.

The invention discloses a production technology of high-fiber fermented blueberry powder rich in anthocyanin. The production technology comprises the following steps: pulping blueberries, carrying out superfine grinding, carrying out synergistic fermentation with bacteria and enzymes, carrying out low-frequency high-power pulse microwave treatment, carrying out low-temperature vacuum spray drying, and packaging to obtain the high-fiber fermented blueberry powder. Through application of technologies such as superfine grinding, bacterium-enzyme synergistic fermentation and low-frequency high-power pulse microwave assisted anthocyanin stabilization, blueberry anthocyanin is promoted to be effectively released from cells, the stability of anthocyanin in the product is improved, the taste of the product is obviously improved, nutrient absorption of the product is improved, particularly absorption of functional components is improved, and the grade of the product is improved; the core competitiveness of the product is improved, and the product has a wide market prospect.

The invention discloses a preparation method of polygonatum kingianum yellow rice wine through multistage physical wall breaking and microwave aging acceleration, and belongs to the technical field of food processing and biology. According to the method, yellow wine is used as base wine, and steam explosion pretreatment, ultrahigh pressure pretreatment and infiltration, enzymolysis, separation and clarification and pulse microwave aging accelerating technologies are sequentially adopted; the method comprises the following steps: firstly, performing multi-stage physical wall breaking on a rhizoma polygonati raw material by utilizing steam explosion and an ultrahigh pressure technology, and forcefully pressing yellow wine into rhizoma polygonati in combination with ultrahigh pressure infiltration so as to realize rapid dissolution of effective components; then macromolecular substances in the rhizoma polygonati are degraded through enzymolysis, and flavor fusion is promoted; and finally, accelerating aging of the wine body by using a pulse microwave technology. Various modern physical and biological technologies are effectively combined, the extraction rate of effective components in rhizoma polygonati can be remarkably increased, the production period is shortened to be within 7 days from several months, the fusion degree of the rhizoma polygonati and the yellow rice wine flavor and the product quality are greatly improved, and the rhizoma polygonati yellow rice wine is better in taste and more stable in quality.

The invention discloses a production method of probiotic fermented blueberry juice, and belongs to the technical field of deep processing of agricultural products. The preparation method comprises the following steps: juicing blueberries, blending, carrying out combined treatment on high-power pulse microwaves and intensive pulse light, inoculating lactic acid bacteria, carrying out temperature-controlled fermentation, and filling to obtain the probiotic fermented blueberry juice. By utilizing the modern high and new technology, the absorptivity of nutritional ingredients and active factors in the probiotic fermented blueberry juice is improved, the grade of the probiotic fermented blueberry juice is improved, the core competitiveness of the probiotic fermented blueberry juice is improved, and the probiotic fermented blueberry juice has a wide market prospect.

This application relates to the field of silica purification and discloses a method for extracting high-purity silica from granite waste. First, pulsed microwave irradiation is applied to the waste powder, inducing microcracks at the phase interface by utilizing the difference in thermal expansion between metal oxide impurities and the quartz matrix. The cracked powder is then placed in a microwave high-pressure reactor, where supercritical carbon dioxide is used to force a eutectic solvent into the microcracks. Continuous microwaves are input, causing dipole polarization of the eutectic solvent, resulting in in-situ polarization heating, reducing kinetic viscosity, and accelerating coordination chelation reactions to form metal complexes. Critical point phase oscillation is performed through alternating temperature and pressure, creating a hydrodynamic pumping effect within the microcracks. A pressure-reducing valve is controlled to release pressure, and a high-speed gas flow carrying impurities is used to discharge the solvent to the external surface. The product is then obtained through washing and separation. This invention effectively solves the problem of difficulty in exposing and eluting deep impurities, significantly improving product purity.

The invention provides a field intensity measuring device based on an optical detection microwave thermotropic acoustic wave signal, which belongs to a pulse microwave testing and measuring technology, and is characterized in that pulse microwave of a pulse microwave source irradiates a sensor, a microwave absorbing medium on the sensor absorbs microwave energy to generate local temperature rise so as to cause thermal expansion and generate an ultrasonic signal; the method comprises the following steps: acquiring a microwave thermotropic acoustic wave signal, namely a microwave thermotropic acoustic wave signal, the microwave thermotropic acoustic wave signal passes through a coupling medium and is detected by an optical-based acoustic detector, and acquiring equipment can invert to obtain field intensity and pulse width information of incident pulse microwaves according to the amplitude, spectral characteristics and time domain waveform of the signal. Compared with a traditional probe-based microwave field intensity testing method, the method based on optics is proposed to detect microwave thermotropic acoustic wave signals, then field intensity testing is achieved, distribution of a microwave field is not affected, pulse microwave signals are not directly introduced into acquisition equipment, and the method is an anti-electromagnetic interference and high-precision microwave field intensity testing method. The invention discloses a field intensity testing method with a high signal-to-noise ratio.

This invention relates to the field of waste circuit board recycling technology, specifically disclosing a precise and continuous gasification system and method for circuit board resin based on reaction kinetics control. The method includes: acquiring the three-dimensional temperature field distribution within the gasifier and detecting the concentration of resin gasification product components using a multi-component flue gas analyzer; dividing the circumference of the gasifier into multiple fan-shaped microwave radiation zones and dynamically adjusting the microwave power density of each zone using a time-sequential rotation method; establishing a pulsed microwave heating strategy, precisely controlling the heating pulse parameters according to the rate of change in gasification product concentration, and combining dual-frequency microwave synergistic heating to achieve efficient gasification of both deep and surface layers of resin; constructing a convection exhaust mechanism to control the gas flow rate and temperature, and drawing in gasification product gas through negative pressure. This application achieves precise and continuous control of the resin gasification process, improving the precise gasification of resin in circuit boards.

The invention relates to the technical field of food processing, in particular to a composite selenium-rich solid beverage and a preparation method thereof. The invention provides a compound selenium-rich solid beverage which comprises the following components: selenium-rich black rice, a compound biphase selenium source, compound prebiotics, green tea polyphenol, momordica grosvenori glucoside, zinc citrate and a shiitake mushroom extract, and further provides a preparation method of the compound selenium-rich solid beverage. Comprising the steps of pulse microwave low-temperature mixing, vacuum low-temperature drying, ultrahigh-pressure cold sterilization and the like, a low-temperature non-thermal processing technology is adopted in the whole process of the method, functional active ingredients are reserved to the maximum extent, and the prepared composite selenium-rich solid beverage is excellent in sensory quality and wide in eating adaptability.

The application provides a method for enzymolysis extraction of functional components of plant powder, and belongs to the technical field of enzymolysis extraction of functional components of plant powder.The plant raw material is crushed, water is added, and then the mixture is placed in a rotary microwave reaction tank;an optimal composite enzyme ratio is calculated according to the contents of cellulose, hemicellulose and pectin in the raw material by using an enzyme efficiency synergy optimization model, and the tank is added with the optimal composite enzyme;microwave-assisted enzymolysis is carried out by using an intermittent pulse microwave heating mode;microwave power is dynamically adjusted by using a microwave field temperature equalization and enzymolysis efficiency double-layer game model;when the enzymolysis rate decreases, ultrasonic synergistic strengthening treatment is started;the enzymolysis liquid is introduced into a membrane reactor system to realize the recycling of enzyme molecules and the continuous removal of products;finally, the enzymolysis extraction liquid is subjected to microwave vacuum sterilization and drying, crushing, mixing of accessories and molding, so that the technical problem of difficult accurate optimization of the composite enzyme ratio in the enzymolysis extraction process of functional components of plant raw material is solved.

The present invention seeks to protect a method for multi-frequency thermoacoustic imaging combined with feature extraction to achieve identification of different tissue components and contents, which belongs to the field of microwave thermoacoustic imaging. The method of the present invention is: multi-frequency microwaves are radiated to biological tissues, and the thermoacoustic signals are received by an ultrasonic transducer, and the signals are amplified and used for image reconstruction. Multi-frequency microwaves are pulsed microwaves of multiple different frequencies. During imaging, different frequencies are switched to successively excite the measured tissue, and multiple groups of thermoacoustic images under microwave excitation of different frequencies are obtained. Then, the multiple groups of thermoacoustic images are fused to obtain multi-frequency thermoacoustic images. Feature extraction is performed by selecting the area of ​​interest in the single-frequency image and identifying the distribution of different tissue components and calculating the content of different tissue components based on the differential algorithm. The present invention also provides a system for implementing the above method. The present invention is closely combined with actual clinical needs, realizes efficient identification of different tissue components and precise contents, and has good application prospects.

This invention relates to the field of building materials, specifically disclosing a method for preparing a curing agent for high liquid limit viscous slag-based fluidized solidified soil. The method includes the following steps: using fly ash, blast furnace slag, composite alkali source, solid waste gypsum, modified waste incineration fly ash, slag powder, and nano-suspension as raw materials. First, the fly ash, blast furnace slag, composite alkali source, solid waste gypsum, modified waste incineration fly ash, and slag powder are mixed evenly. Then, the resulting mixed powder undergoes plasma treatment for surface modification. After modification, the nano-suspension is added and mixed with water to form a slurry for grinding. Then, the mixture is spray-dried, and the resulting modified powder is activated by pulsed microwaves to obtain the curing agent for fluidized solidified soil. This method effectively overcomes the shortcomings of traditional ordinary silicate cement curing agents, such as insufficient curing effect on high liquid limit slag soil.

The invention discloses composite oligosaccharide coated fruit chips and a preparation method thereof, and belongs to the technical field of food processing. The method comprises the following steps: soaking fruit slices in a color-protecting solution, then soaking the fruit slices subjected to color-protecting treatment in a composite oligosaccharide coating solution, taking out, draining and drying. According to the method, fructo-oligosaccharide and a resistant dextrin system in a specific ratio are adopted as a film coating substrate, and efficient film coating is realized through a vacuum impregnation process; and by combining a pulse microwave and hot air combined drying technology, the energy consumption is greatly reduced while the product quality is ensured, and the method is more suitable for industrial production.

The invention provides a preparation method of lotus leaf herbal tea rich in flavone and alkaloid, and belongs to the technical field of plant beverage processing. The preparation method comprises the following steps: steaming lotus leaves, drying in the sun, weighing 1000-1500g of cassia seeds, 500-750g of sophora flower buds, 250-350g of exocarpium benincasae and 150-250g of roses according to every 1000g of lotus leaves, blending, crushing the raw materials, mixing the crushed raw materials with water according to a mass ratio of 1: (40-50), infiltrating the mixture, placing the mixture in high-power pulse microwave equipment, and carrying out pretreatment under the conditions that the peak power of pretreatment is 750kW, the peak frequency is 3GHz and the pulse width is 1.5 microseconds; the preparation method comprises the following steps: taking lotus leaves as a raw material, carrying out hot water stirring extraction for 40-60 seconds at 85-90 DEG C for 20-30 minutes, adding erythritol and sucralose into the obtained extracting solution, blending, filtering, sterilizing and filling to prepare the lotus leaf herbal tea. The prepared lotus leaf herbal tea has the effects of relieving summer heat and quenching thirst, clearing heat and improving eyesight, moistening intestines and relaxing bowels, reducing fat and slimming and the like.

The application discloses a kind of asphalt pavement microwave intermittent pulse heating healing method and system.The method comprises: applying calibration pulse to pavement material and fitting cooling curve to obtain characteristic thermal relaxation time constant τ ;with τ As control variable, intermittent pulse microwave heating is carried out on the healing area, and the pulse intermittent time t r Satisfies 1.5 τ ≤ t r ≤ 3 τ , and the maximum temperature monitored by infrared temperature measurement during heating does not exceed the safety threshold.The microwave self-healing heating system automatically completes τ Calibration and calculation of subsequent intermittent duration.The present application utilizes the hysteresis conduction intersection effect of wave-absorbing aggregate residual heat during the intermittent period, and under the same total heating energy, the maximum temperature deviation is reduced by more than 55%, the cycle healing rate is increased by more than 38%, and the asphalt thermal oxidative aging index is reduced by more than 47%.

The application discloses a high-sensitivity microwave receiving system and method with atomic polarization enhancement, and the system comprises a first laser, an atomic gas chamber, a second laser, a dichroic mirror, a photodetector, a first signal source, a second signal source, a first antenna, a second antenna and a host computer. The method is characterized in that: the first signal source is used to generate a pulsed microwave field to prepare an atomic initial state to a specific ground state; the first laser is used to generate detection light which is resonant with an atomic ground state and a metastable state energy level transition; the second laser is used to generate coupling light which is resonant with an atomic excited state and a Rydberg state energy level transition; the detection light and the coupling light are used to excite the atom to the Rydberg state; the second signal source is used to generate a microwave field which is jointly used to cause periodic changes of atomic energy levels, and the microwave field is used to generate periodic modulation on the intensity of the detection light; the power of the modulation signal is proportional to the power of a to-be-measured microwave, and the to-be-measured microwave receiving measurement is realized. The atomic polarization enhancement method can increase the number of atoms participating in the microwave measurement, and improve the microwave receiving performance.

The invention belongs to the technical field of preparation of a lithium ion battery positive electrode material, and discloses a lithium iron phosphate composite material prepared by coupling a molecular self-assembly template with microwave flash burning, and a preparation method and application thereof. The preparation method comprises the following steps: constructing a molecular self-assembly colloid precursor containing lithium, iron, phosphorus and a carbon source by using a functionalized carbon source with complexing ferrous ions and functional groups interacting with phosphate radicals in an inert atmosphere and a deoxygenated water environment, and carrying out spray drying to form a microsphere precursor; and carrying out short-time flash-burning crystallization at a high heating rate by adopting pulse type microwaves in a protective atmosphere containing trace hydrogen, so as to rapidly prepare the lithium iron phosphate composite material with the nano-structure. The lithium iron phosphate composite material obtained by coupling the molecular self-assembly template with microwave flash sintering has relatively high tap density and rate capability, and has important industrial application value.

The invention provides an aquaculture wastewater phosphorus resource recovery method based on struvite process mediation, relates to the technical field of livestock and poultry breeding waste recycling and sewage treatment, is applied to an aquaculture wastewater phosphorus resource recovery system, and comprises the following steps: roughly filtering biogas slurry, and then feeding the biogas slurry into a microwave ultrasonic coupling reactor for pretreatment; a magnesium source is added into the pretreated biogas slurry, the pH is adjusted to be alkaline, and the adjusted mixed solution sequentially passes through a primary seed crystal generator, a pulse microwave regulation and control device and a secondary crystal growth reactor to generate struvite crystals; carrying out spiral extrusion dehydration, cutting granulation and spraying coating on the slurry containing struvite crystals to obtain coated slow-release fertilizer particles and separated supernate; wherein the supernate is sent to an adsorption column, and secondary recovery of phosphorus resources is carried out through regeneration of an adsorbent. Therefore, efficient recovery of phosphorus resources, deep purification of wastewater and high value of products are realized.

The invention discloses an environment-friendly method for efficiently extracting rare minerals, which belongs to the field of mineral processing and comprises the following steps: multi-frequency pulse microwave pretreatment: performing multi-frequency pulse microwave pretreatment on mineral raw materials; supercritical CO2 synergistic extraction: adopting supercritical CO2 to cooperate with a low-concentration organic complexing agent for extraction; carrying out pulsed electric field assisted solid-liquid separation: carrying out pulsed electric field assisted solid-liquid separation; enrichment of a microbial fuel cell: carrying out selective enrichment of valuable elements by using the microbial fuel cell, adopting a carbon nanotube modified graphite electrode as an anode, and inoculating sulfur oxidizing bacteria; and low-temperature vacuum distillation recovery: carrying out low-temperature vacuum distillation recovery on the extraction agent by adopting a wiped film type molecular distillation device. A traditional single-frequency mode is broken through through a multi-frequency pulse microwave pretreatment technology, selective heating can be accurately carried out according to different mineral characteristics, compared with single-frequency microwaves, the mineral decomposition efficiency can be improved, and a good foundation is laid for subsequent extraction and other procedures.