79 results about "Microwave method" patented technology

The application discloses a method for preparing high-purity battery-grade lithium sulfide by reducing lithium sulfate with a reducing gas. The specific steps are as follows: raw material lithium sulfate and inert wave-absorbing substances are mixed, uniformly mechanically ball-milled, tablet-pressed, sieved, put into a microwave reactor, and then a reducing gas is introduced for microwave heating reaction; after cooling to room temperature, the mixture is discharged into another reactor, ethanol is added for dissolution, mechanical stirring is carried out, and then standing and filtration are performed; the inert wave-absorbing substances are recycled and reused; an ethanol solution of dissolved lithium sulfide is obtained; crude lithium sulfide is obtained by heating and distillation; after freeze-drying, the crude lithium sulfide is heated and secondarily calcined in a rotary furnace under the protection of inert gas, and finally battery-grade high-purity lithium sulfide is obtained. By mixing the inert wave-absorbing substances with the lithium sulfate and heating by the microwave method, the contact surface of the lithium sulfate and the gas can be improved, and in addition, the internal heating method can be used to avoid the lithium sulfide formed on the outer surface from wrapping the raw material lithium sulfate, so as to affect the hydrogen reduction efficiency.

The invention discloses a microwave-assisted green micro-nano platinum powder preparation method and application thereof. The method comprises the following steps: a) preparing a platinum ion solution; b) adding a dispersing agent and a surfactant; c) adding a reducing agent; d) microwave heating reaction; e) separating and purifying a product; and f) drying: drying the product at low temperature to obtain the micro-nano platinum powder. Through microwave field enhanced mass transfer and nucleation kinetics, compared with a traditional chemical reduction method, the reaction efficiency is improved by 80% or above, high-temperature and high-pressure conditions are not needed, and the process energy consumption is reduced by about 60%. The obtained platinum nano-powder is excellent in dispersity, the specific surface area reaches 20-50 m < 2 > / g, and the platinum nano-powder shows high activity in a proton exchange membrane fuel cell catalyst. The method is suitable for continuous production, and an efficient solution is provided for application of the high-performance platinum-based material in the fields of catalysis, new energy and electronic devices.

The invention discloses a high-dispersion cobalt-based catalyst and a preparation method and application thereof, and belongs to the technical field of cobalt-based catalysts.The preparation method comprises the steps that tetracarboxyl cobalt phthalocyanine and nitrogen-defect carbon nanotubes serve as raw materials, a pre-assembled compound is formed in an organic solvent through molecular self-assembly, then programmed microwave heating is conducted on the pre-assembled compound, and the high-dispersion cobalt-based catalyst is obtained. According to the high-dispersion cobalt-based catalyst and the preparation method thereof disclosed by the invention, a means of combining a specific molecular precursor and carrier defect engineering is utilized, a'molecular anchor-anchor positioning 'pre-connection system is constructed through liquid-phase pre-assembly, and a programmed microwave energy accurate input principle is supplemented, so that the high-dispersion cobalt-based catalyst is obtained. The key technical problems that when the cobalt-based catalyst is prepared through an existing microwave method, metal atoms are prone to agglomeration, the active site structure is uncontrollable, and the catalytic performance is ordinary are successfully solved.

The invention discloses a method for preparing micro-nano copper oxide powder through a microwave method and application of the micro-nano copper oxide powder. The method comprises the following steps: a) preparing a copper ion solution; b) adding a dispersing agent and a surfactant; c) adding urea; d) microwave heating reaction; e) separating and purifying a product; and f) drying and calcining. According to the preparation method, the rapid heating characteristic of microwave radiation is utilized, the effect of urea is combined, dispersing agents such as polyvinylpyrrolidone (PVP) and the like and surface active agents are added into a solution containing copper ions, the copper oxide nano-particles with the particle size distribution being 50-100 nanometers and even being controllable to be in the micron order are prepared, and the copper oxide nano-particles have good crystal structures and dispersity; the method is simple in process, high in reaction speed and low in energy consumption, and the obtained copper oxide nano particles can be used for preparing high-performance and high-purity copper oxide nano materials and have wide application prospects.

The invention discloses a preparation method of a wide-layer-distance novel aluminum dihydrogen phosphate layered material based on a microwave method, which comprises the following steps: (1) dispersing MXene in a solvent for ultrasonic dispersion, adding a Py monomer, and uniformly stirring; dropwise adding APS to carry out oxidative polymerization, and carrying out in-situ polymerization on polypyrrole on the surface of the MXene sheet layer; after the reaction is finished, centrifuging, washing and drying a product to obtain MXene coated PPy composite powder; (2) mixing phosphoric acid and aluminum hydroxide, stirring in a water bath to form a uniform gel precursor, adding the MXene-coated PPy composite powder into the precursor, and dispersing to obtain a modified precursor; (3) placing the modified precursor in a microwave reactor for reaction to obtain a product; and (4) carrying out cooling, suction filtration, washing, drying and crushing on the product to obtain the novel wide-layer-distance aluminum dihydrogen phosphate layered material. The method has the characteristic of efficient process design, and is mainly reflected in that the molecular interlayer spacing of the material is effectively widened, the microwave-assisted reaction time is short, the energy consumption is low, and the process is green and environment-friendly.

This invention belongs to the field of heavy metal ion detection technology, specifically relating to a method for detecting Co based on microwave-synthesized histidine carbon quantum dots from yam. 2+ The method involves adding ground yam powder and histidine to deionized water, stirring, and then microwaving. After centrifugation, the supernatant is filtered through a filter membrane, and the filtrate is the yam-doped histidine carbon quantum dot (F-CDs) mother liquor. Different concentration gradients of Co are added to the F-CDs mother liquor. 2+ Subsequently, the fluorescence intensity of the F-CDs mother liquor increased with Co. 2+ The quenching efficiency F / F0 and Co gradually decrease with increasing concentration. 2+ In 1×10 ‑6 ~9×10 ‑6 The method exhibits good linearity within the mol / L concentration range and demonstrates good selectivity, indicating that it is effective for Co. 2+ The detection is characterized by its sensitivity, speed, and high selectivity.

The invention belongs to the technical field of supercapacitor electrode material preparation, and discloses a method for preparing a supercapacitor by using nitrogen-doped biomass derived porous carbon composite nickel-cobalt-manganese oxide. According to the method, biomass waste is taken as a raw material, and low-cost and large-scale preparation is realized through an innovative process, namely nitrogen-doped biomass pretreatment, high-temperature carbonization and microwave-method efficient compounding of a metal compound. The method comprises the following specific steps: mixing and soaking biomass and a urea solution, and carrying out urea-assisted soaking to realize nitrogen doping; then carbonizing under the protection of nitrogen, and performing high-temperature carbonization to form a biomass charcoal matrix; and finally, rapidly compounding the biomass charcoal and the nickel-cobalt-manganese oxide through a microwave radiation technology. A green doping and microwave efficient composite strategy is adopted. The process effectively solves the problems of non-uniform doping, complex compounding mode, time consumption and the like in the traditional technology, and provides an innovative solution for preparation of a high-performance supercapacitor electrode material.

The application belongs to the technical field of environmental material synthesis, and particularly relates to a method for synthesizing a composite film by means of NMP-induced surface self-corrosion assisted rapid spin coating and application thereof; the steps are as follows: firstly, PDI and PEDOT are prepared, then a photocatalyst is prepared by means of a microwave method and a surface imprinting technology, and then the photocatalyst is embedded in surface pores of a PVDF film by means of NMP-induced surface self-corrosion assisted rapid spin coating to prepare an imprinting composite film with high stability and high permeability; the imprinting PDI / PEDOT photocatalyst is firmly embedded in the surface pores of the PVDF film, the stability is effectively improved, and a high water flux and a high light degradation activity are maintained. In addition, the construction of a heterojunction structure and the existence of imprinting cavities endow the imprinting composite film with good self-cleaning performance, photocatalytic performance and significant selectivity, and the imprinting composite film has a wide application prospect.

The application provides a preparation method and device of a graphdiyne powder material, and the method comprises the following steps: under the action of microwaves, the graphdiyne powder is prepared through a solution homogeneous system and in combination with a flow continuous growth process. The application realizes the large-batch continuous preparation of the graphdiyne powder under the condition of no substrate by using the microwave method, and overcomes the technical difficulty that the graphdiyne powder is difficult to continuously mass-produce in a homogeneous solution. The reaction time is short, the yield is high, the operation is simple, and the two-dimensional graphdiyne nanosheet with uniform sheet diameter is prepared.

This invention relates to a wear-resistant phase change energy storage material and its preparation method, belonging to the field of energy storage material technology. The invention uses hydrazine hydrate and a hydrothermal method to prepare a mixture of tetragonal zirconium oxide and cerium oxide through complexation, followed by calcination in high-purity oxygen to obtain a CeO2-ZrO2 mixture. This mixture exhibits good wear resistance, resulting in a longer service life for the prepared phase change energy storage material. The invention also prepares modified halloysite nanotubes using a combination of impregnation and microwave methods. Impregnation allows a mixture of graphene and yttrium oxide to be uniformly loaded onto the halloysite nanotubes, forming a composite material. Microwave heating allows for rapid and uniform heating of the sample, enabling better bonding of graphene and yttrium oxide on the halloysite nanotubes and the formation of stable chemical bonds among the three. Furthermore, the invention introduces titanium carbide into the phase change energy storage material, which significantly improves the overall hardness of the material, thereby enhancing its wear resistance.

The invention relates to the technical field of crude oil moisture meters, and discloses a microwave method crude oil moisture meter calibration device and method, the microwave method crude oil moisture meter calibration device comprises a rack and a storage cylinder, the rack is provided with a conveying belt, and the rack is also provided with a determination mechanism, a limiting mechanism and an output mechanism. According to the device, the storage cylinders loaded with crude oil with known water content can be sequentially conveyed, so that a worker can conveniently switch standard samples with high, medium and low water content, and the rapid change of the water content of different crude oil in different sections of a pipeline is simulated; the stability of the storage cylinder can be guaranteed, in addition, during detection, the temperature control module adjusts the temperature of the surrounding environment of the crude oil, the air pump feeds air into the storage cylinder, and the moisture content of the crude oil is detected in different pressure and temperature environments, so that the environment of an oil field site can be simulated, and the detection accuracy is further guaranteed.

The present invention is applied to the field of new energy materials and electrocatalytic water splitting technology. A Ru-doped crystalline / amorphous CoMoOx nanosheet catalyst grown on nickel foam (NF) by a coprecipitation-microwave method is adopted, denoted as a / c-RuCoMoOx / NF. And by adjusting the microwave time, the ratio of the crystalline / amorphous components is controlled, and thus a / c-RuCoMoOx / NF with the best crystalline / amorphous component ratio and rich crystalline / amorphous heterointerfaces is obtained. When this catalyst is used as the working electrode, it exhibits excellent HER and OER activities and stabilities in an electrolyte of 1.0 M KOH. In addition, it also has excellent overall water splitting activity and stability in an electrolytic cell with an electrolyte of 1.0 M KOH. According to the Faraday test, the Faraday efficiency is close to 100%.

The application discloses a sewage plant intelligent sludge discharge and dewatering and dosing control system based on big data analysis, which comprises a big data analysis control platform connected with each water quality and quantity monitoring facility, each sludge pump, each sludge flowmeter, each microwave method sludge concentration meter, the dewatering equipment, the dosing pump and the dosing flowmeter through communication cables; and the big data analysis control platform controls after analyzing and calculating the data obtained from the communication cables. The application establishes a big data analysis control platform of sewage plant mechanism and data fusion, starts from the whole of sludge discharge, dewatering and dosing, accurately and dynamically controls sludge concentration, sludge dewatering and dosing amount, reduces the operation load of the dewatering equipment and the dosing amount, and achieves the effect of intelligent low-carbon operation.

The present invention provides a CDs-loaded MIL-53(Fe)-NO2-type oxide nanozyme and its preparation method and application, which belong to the technical field of carbon-based nanomaterials. The present invention uses MIL-53(Fe)-NO2 as a carrier matrix, and through a one-step microwave method, carbon dots rich in nitrogen and oxygen functional groups are loaded into MIL-53(Fe)-NO2 to obtain CDs@MIL-53(Fe)-NO2-type oxide nanozymes. The preparation process of the present invention is simple and fast, which solves the problem that the existing CDs@MOFs-type oxide nanozymes do not have oxidase-like activity in the absence of external stimulation. The obtained CDs@MIL-53(Fe)-NO2 has excellent oxidase activity in the absence of external stimulation, and can be applied to the fields of biosensing, pharmaceuticals, food, antibacterial, environmental protection, etc., and can be further applied to the fields of bioanalysis and food safety.

The application discloses a method for preparing Li3Fe2(PO4)3 from retired positive electrode powder of lithium iron phosphate battery, which comprises the following steps: mixing the active powder obtained by decomposing the positive electrode sheet with acid or alkali, and then adding an oxidizing agent to react to obtain a mixed solution; putting the mixed solution into a microwave reactor to react to obtain a Li3Fe2(PO4)3 precursor solution; centrifuging the precursor solution and washing it for multiple times, and then putting it into a muffle furnace to calcine after drying, and finally obtaining the powder-shaped Li3Fe2(PO4)3. The application can avoid the use of a large amount of strong acid and strong alkali in the traditional wet method, and can realize a short process, a simple preparation method, low cost, and direct regeneration of lithium battery positive electrode materials. After introducing an external field by the microwave method, the acid and the alkali promote the change of the structure of LiFePO4, and the recovery of lithium and iron elements is facilitated. In addition, after recycling, the application obtains the NASICON type Li3Fe2(PO4)3 with high ionic conductivity and stable structure as a positive electrode material to assemble a lithium ion battery, and it is found that the lithium ion battery has good reversible capacity and excellent capacity retention rate.

This invention provides an antibacterial cotton fiber based on silver-doped carbon quantum dots (Ag-CQDs), its preparation method, and its applications, belonging to the field of functional textile materials technology. This invention employs a microwave method for the rapid synthesis of silver-doped carbon quantum dots (Ag-CQDs). Utilizing the instantaneous high temperature, uniform heating, and electron transfer-promoting properties of microwaves, silver ions rapidly combine with the oxygen- and nitrogen-containing functional groups of the carbon precursor, forming a covalent / coordination composite structure of silver-doped carbon quantum dots. Further chemical modification of the cotton fiber generates numerous active reaction sites on its surface. Finally, Ag-CQDs are firmly loaded onto the cotton fiber surface and surface voids through covalent bonds, coordination bonds, and hydrogen bonds, forming a uniform, continuous, strong, and washable antibacterial coating. The resulting silver-doped carbon quantum dot-based cotton fiber exhibits long-lasting antibacterial properties, along with low toxicity, high stability, and good bonding strength, demonstrating excellent application prospects in the field of long-lasting antibacterial textile materials.

The application discloses a method for detecting glyphosate in coffee by Cu-CDs / ABEI@Ag nanozyme catalytic chemiluminescence, and belongs to the technical field of chemical analysis and detection. 2+ The application is characterized in that 4-aminoantipyrine is used as a precursor, Cu is used as a doping element, Cu-doped carbon dots (Cu-CDs) are synthesized by a microwave method, Cu-CDs and ABEI are used as reducing agents to synthesize Cu-CDs / ABEI@Ag nanozyme, the Cu-CDs / ABEI@Ag nanozyme has excellent peroxidase-like (POD-like) activity, promotes the decomposition of H2O2, and enhances a chemiluminescence signal; glyphosate can interact with the Cu-CDs / ABEI@Ag nanozyme to inhibit the POD-like activity of the nanozyme, so that the chemiluminescence intensity generated by the oxidation of ABEI is reduced; and based on this, the method is used for detecting glyphosate in coffee samples, and has the characteristics of high specificity, simple operation and high sensitivity.

The invention relates to the technical field of nano biological medicine, and discloses a Ce-Cu bimetal MOF nano enzyme prepared based on a microwave method and a preparation method and application thereof.The preparation method comprises the following steps that cupric nitrate trihydrate and pyrazole-4-carboxylic acid are completely dissolved in N, N-dimethylformamide through oscillation dissolution or ultrasonic dissolution, and a solution A is prepared; ultrasonically dispersing the Ce6 cluster in water to prepare a solution B; mixing the solution A with the solution B, and slowly adding trifluoroacetic acid to prepare a mixed solution C; the mixed solution C is placed in a microwave reactor, the reaction temperature ranges from 80 DEG C to 100 DEG C, the microwave power ranges from 300 W to 400 W, and the reaction time ranges from 15 min to 30 min; and centrifuging and washing to obtain the Ce-Cu bimetal MOF nano-enzyme with the particle size of 100 to 200 nm. The reaction is rapid, the morphology is controllable, and the SOD and CAT simulation activity is high.

The invention relates to a method for preparing resistant dextrin by using an intermittent microwave technology, which comprises the following steps: (1) adding an acid solution into starch, sealing and uniformly stirring to obtain acidified starch; (2) carrying out intermittent microwave operation on the acidified starch according to different empty-duty ratios to prepare a resistant dextrin crude product; and (3) dissolving the crude product of the resistant dextrin, performing enzymolysis and centrifugation through thermostable alpha-amylase and saccharifying enzyme, performing alcohol precipitation with ethanol, cleaning, and drying to obtain the resistant dextrin. By adopting the intermittent microwave method, the energy loss is reduced, the yield and the purity of the resistant dextrin are improved, and the production cost is saved.

The invention discloses a photo-production microwave method based on a light injection semiconductor laser. An output optical signal of injecting the light in the single-period oscillation state into the semiconductor laser is transmitted through an optical fiber to generate an electric feedback signal, the electric feedback signal is used for performing electro-optical modulation on the injected light, and finally, the output optical signal is subjected to photoelectric detection to obtain a low-noise photo-generated microwave signal; the electric feedback signal generation method comprises the following steps: firstly, converting a transmitted output optical signal into an electric signal and dividing the electric signal into two paths; performing frequency division on the first electric signal to obtain a frequency-divided electric signal; performing feedback control adjustment on the phase of the second path of electric signal by taking the constant phase difference between the frequency division electric signal and a reference signal with the same frequency as a control target; and combining the second path of electric signal after feedback control adjustment with the reference signal into one path to obtain the electric feedback signal. The invention further discloses a photo-generated microwave device based on the light injection semiconductor laser. The frequency spectrum purity and the frequency stability of the signal can be effectively improved.

The invention relates to a method for synthesizing calcium carbonate by using a microwave method, and a product and application thereof, and the method comprises the following steps: co-dispersing a calcium ion salt aqueous solution, a carbonate ion salt aqueous solution and a surfactant in an organic solvent, carrying out microwave treatment on the mixed solution, centrifuging the treated solution, and harvesting the precipitate, namely the calcium carbonate product. According to the preparation method, the solvation layer structure and the nucleation dynamic process of calcium ions are effectively adjusted by using the organic solvent, the surfactant is introduced to promote the formation of a stable micelle dispersion system between the calcium ions and carbonate ions, and the reaction system is efficiently and uniformly heated by using a microwave radiation technology; microwave field heating can pertinently realize rapid temperature rise in the crystal nucleation process and keep high-energy continuous supply, which plays a key role in promoting rapid formation and oriented growth of crystals. After the calcium carbonate is used as a filler for papermaking, the tensile strength and the air permeability of paper can be remarkably optimized.

The invention discloses a preparation method and application of novel biomass carbon dots. The preparation method comprises the following steps: S1, adding apple branch powder into water, and uniformly mixing to obtain a mixed solution; and S2, putting the mixed solution obtained in S1 into a microwave oven for microwave treatment to obtain a reactant. S3, taking out reactants, cooling the reactants to room temperature, and adding water for centrifugal filtration treatment. And S4, collecting a supernatant obtained by treatment in S3, and purifying the supernatant. And S5, drying the purified product obtained in S4 to obtain the biomass carbon dots, and storing the prepared biomass carbon dots in an environment with a constant temperature of 4 DEG C for later use. Apple branches are used as precursors, the biomass carbon dots are synthesized through a microwave method, biocompatibility is good, toxicity is low, high-selectivity and high-sensitivity detection of Cr < 6 + > and riboflavin can be achieved, the synthesis process is economical, environmentally friendly, rapid, simple and convenient, and a new scheme is provided for the environment-friendly detection technology.

The application discloses a kind of sodium vanadium phosphate positive electrode material, positive electrode sheet and preparation method, application thereof.The preparation method of the sodium vanadium phosphate positive electrode material mainly includes the following steps: (1) vanadium source, organic alkaline substance and ethanol are mixed, precursor is prepared by microwave method;(2) the mixture of precursor and sodium source, phosphorus source is calcined, and the sodium vanadium phosphate positive electrode material prepared by the application has one-dimensional nanowire structure, which is beneficial to optimize ion conductivity, when it is applied to battery, the battery has low internal resistance, high energy density, good rate performance and cycle performance.The raw materials used in the application are relatively cheap and easy to obtain, and the production time is significantly shortened, easy to realize, and has industrial application prospect.

The invention relates to a pulverized coal concentration detection system and method based on a microwave method. The system comprises a microwave sensor, a microwave signal routing and conditioning module and a data processing and control module, the microwave sensor is of an annular structure, and a plurality of electrodes which are arranged in a total cross-section surrounding array mode are arranged in the annular structure. The microwave signal routing and conditioning module comprises a microwave switch matrix and a microwave signal conditioning unit; the microwave switch matrix is used for switching a signal transmission path between the electrodes, and the signal conditioning unit is used for generating a multi-band microwave signal and conditioning a received signal; and the data processing and control module is used for controlling the working parameters of the microwave signal routing and conditioning module and carrying out data processing. The device has the beneficial effects that the innovative switch matrix and multi-electrode design is adopted, and richer working condition information in the pulverized coal pipe can be obtained, so that the accuracy of pulverized coal concentration data is improved, and the detection effect is remarkably improved.

A heat-not-burn device, its heating control method, a program product, and a storage medium. The heating control method includes: when heating a tobacco medium using a microwave method, detecting the frequency of a microwave signal in real time, and determining an initial time point corresponding to when the tobacco medium reaches a specific temperature according to the frequency detected in real time (step S10); determining the required energy of the tobacco medium from the initial time point according to the specific temperature and a preset target temperature (step S20); and controlling the output power and / or output time of a microwave source unit so that the temperature of the tobacco medium reaches the target temperature according to the required energy (step S30).

This invention belongs to the field of cement technology, specifically relating to a method for preparing molybdenum tailings cementitious composites using a microwave method. The specific steps of this method are as follows: Molybdenum tailings are ground together with other admixtures; water is added to the molybdenum tailings powder and stirred evenly to obtain a mixture; a microwave field is applied to the mixture and maintained for 10-40 minutes to obtain a composite material; the composite material is crushed and sieved to obtain the molybdenum tailings cementitious composite material prepared by the microwave method. This method uses molybdenum tailings as the main raw material, combined with natural minerals such as limestone and bauxite, to prepare a composite material with high activity. The operation is simple and does not require extensive new equipment or technology.

The present invention discloses a method and system for detecting the moisture content of tea seed kernels based on microwave frequency sweeping technology and a Stacking integration model, and belongs to the field of tea seed quality detection. Specifically, the method and system include: 1. obtaining a microwave frequency sweeping data set; 2. normalizing processing and performing feature selection based on the Ridge‑RFE algorithm to generate a training subset and a test subset; 3. constructing a Stacking integration model with a two-layer structure based on the training subset, wherein a hybrid evaluation index IN3 is calculated to select the algorithm of the base learner of the first layer of the training model; 4. using the trained Stacking integration model to detect the moisture content of the tea seed kernel sample to be tested. The present invention fills the technical gap in the field of non-destructive detection of tea seed kernel quality using microwave methods, designs a hybrid evaluation index to evaluate the overall performance of the model during cross-validation and testing, and improves the objectivity of Stacking integration.

The utility model relates to equipment for extracting gypsum whiskers from gypsum wastes by an ultrasonic-assisted microwave method. The equipment comprises a size mixing tank, a pipeline ultrasonic reaction system, a microwave reaction tank and a microwave crystallizing tank, a water inlet is formed above the size mixing tank, and a size stirrer A is arranged in the size mixing tank; the pipeline ultrasonic reaction system comprises a reaction tank, an ultrasonic pipeline wrapped on the outer wall of the reaction tank and a plurality of ultrasonic generating devices arranged in the ultrasonic pipeline; a gypsum slurry pump is arranged outside the reaction tank, and a variable-frequency speed-regulating stirring device and an ultrasonic sensing probe are arranged in the reaction tank; one side of the ultrasonic pipeline is connected with the size mixing tank, and the other side is connected with the microwave reaction tank; a temperature sensor is arranged on the outer wall of the microwave reaction tank, and a slurry stirrer B is mounted in the microwave reaction tank; the microwave reaction tank is connected with a microwave crystallizing tank through a slurry pipeline D, and the microwave crystallizing tank is connected with a drying machine. The production cost is low, the comprehensive energy consumption is reduced while the production efficiency is improved, and the comprehensive utilization of industrial wastes is realized.

This invention discloses a real-time detection method for the moisture content of fine aggregates in concrete production, belonging to the field of fine aggregate moisture content detection. The method includes: acquiring several sand samples with different moisture contents for different fine aggregates; extracting stable feature values ​​of the signal from the original signal sequence acquired by a microwave moisture content sensor for each sand sample using the sliding window density peak method; calculating the average thickness, average flow velocity, and average temperature; constructing a first prediction model based on an enhanced multiple regression model; constructing a second prediction model based on a tree model; determining the optimal moisture content prediction model from the first and second prediction models; and in concrete production, acquiring the stable feature values, thickness, flow velocity, and temperature of the signal in real time, and calling the optimal moisture content prediction model for the corresponding fine aggregate to predict the moisture content. This invention solves the problem of measurement inaccuracy caused by random fluctuations in the original signal and variable material flow conditions when using microwave methods to detect the moisture content of sand and gravel online.

The application belongs to the technical field of inorganic compound preparation, and particularly discloses a sodium tetrachloroaluminate preparation method based on microwave heating. In a protective atmosphere, aluminum chloride and sodium chloride are reacted under microwave heating to obtain sodium tetrachloroaluminate; the sodium tetrachloroaluminate is purified by aluminum during preparation. The application melts the reaction raw materials by microwave heating, the aluminum chloride has strong polarity, dominates microwave absorption, and after mixing, the dielectric loss factor of the system can be improved to 0.5-1.2, and the wave absorbing capacity is more than 10 times higher than that of pure NaCl. In the molten sodium tetrachloroaluminate, AlCl4 ‑ and Na + freely move and efficiently convert microwave energy through ionic conduction loss. At the same time, compared with traditional stirring, the movement of sodium chloride molecules in the external alternating electromagnetic field also accelerates the synthesis speed with aluminum chloride, greatly reducing the preparation time of sodium tetrachloroaluminate.