46results about How to "Applicable application" patented technology

The invention relates to the field of stem cells, discloses a method for preparing exosome freeze-dried powder of stem cells, and particularly relates to a method for preparing exosome freeze-dried powder of human amniotic mesenchymal stem cells. The method for preparing the exosome freeze-dried powder of the human amniotic mesenchymal stem cells disclosed by the invention comprises the following steps: mixing trehalose with exosomes of the human amniotic mesenchymal stem cells as a cryoprotectant; filtering and removing bacteria by virtue of a filter membrane; and firstly carrying out ultralow temperature pre-freezing, and then carrying out low-temperature freezing at a certain vacuum degree. The preparation method disclosed by the invention is simple to operate, safe and effective. An experiment proves that compared with a conventional preparation method of the freeze-dried powder, the morphologies and the activity of the exosomes of the human amniotic mesenchymal stem cells can be well kept by the method for preparing the exosome freeze-dried powder of the human amniotic mesenchymal stem cells disclosed by the invention; and the method is suitable for long-term preservation and application of the exosomes of the human amniotic mesenchymal stem cells.

The invention discloses a preparation method for a metal nanometer / micrometer dendritic crystal ordered array. A conductive array substrate is used as a working electrode, an electrolyte comprises a metal salt solution and an additive with the dosage being 0-5% of the metal salt solution by molar concentration, and metal nanometer / micrometer dendritic crystals are electrically deposited on the surface of the substrate in a controlled mode through a volt-ampere method, so that the metal nanometer / micrometer dendritic crystal ordered array is obtained. The conductive array substrate is provided with an ordered conductive array, the additive comprises at least one of a complexing agent and a surfactant, and the additive is used for promoting the forming of the metal nanometer / micrometer dendritic crystals and regulating and controlling the morphology. According to the preparation method for the metal nanometer / micrometer dendritic crystal ordered array, the process is simple, operation is easy, the preparation time is short, efficiency is high, and the method is suitable for industrial production and application; and the obtained metal nanometer / micrometer dendritic crystal ordered array is controllable in shape, thickness and size.

The invention discloses a preparing method for a composite repairing agent and the composite repairing agent prepared through the method. The preparing method comprises the steps that nanometer zero-valent iron is added in a sulfosalt solution, and a sulfosalt and nanometer zero-valent iron mixed solution is obtained; a hydroboron solution is added in the mixed solution to be sufficiently stirred,sulfide is reduced through the reducing capability of hydroboron, supernate is removed, and a vulcanized nanometer iron solid is obtained; and the vulcanized nanometer iron solid and a persulfate solution are mixed, and the composite repairing agent is obtained. A method for repairing organic pollutants in polluted soil and underground water through the composite repairing agent is further disclosed. The method can be widely applied to water treatment and soil repairing and has the beneficial effects that the production technology is simple, and preparing raw materials are easy to obtain; andsynchronous treatment of the organic matter in the polluted soil and the underground water is achieved, and good economic benefits and social benefits are achieved.

The invention relates to a method for extracting cyclic adenosine monophosphate (cAMP) from red jujubes, which comprises the steps of cleaning of the red jujubes, soaking of the red jujubes at normal temperature, precooking and pulping, zymohydrolysis on pectin mixed enzyme, filter pressing, anion resin combination, formic acid elution, nano-filtration and interception of formic acid with nano-filtration membrane, and purification, thus obtaining a finished product. The method solves the problems of complex current process, long period, low product purity and the like, and has the advantages of rich raw material sources, simple process, large processing amount, high extraction rate, high product purity and the like; the product is a natural non-toxic product; the finished product cAMP can be used for medical raw materials or used as food additive; the extracted byproduct red jujube juice can be continuously and deeply processed to promote the industrial chain of comprehensive development and achieve pollution-free production; the modern nano-filtration technology is applied to industrial production, therefore, not only the cost is reduced, but also a better path for deeply processing the red jujube raw material is provided, and the consumption of energy is greatly reduced; and the method not only has important economic benefit, but also has remarkable social benefits.

The invention provides a plant protective adhesive as well as a preparation method and application thereof. The adhesive provided by the invention takes green raw materials as a cross-linking agent, and the prepared raw materials do not contain formaldehyde, so that the formaldehyde release problem of the adhesive is radically and completely solved, and therefore, the adhesive is greener and moreenvironmentally friendly. According to the results of the embodiment, the plant protein adhesive does not contain poisonous and harmful substances such as free formaldehyde and free benzene series compounds, and is completely green, so that a green and environmentally-friendly fine wooden board without harmful substance release can be manufactured. The plant protein adhesive prepared by the preparation method has viscosity of 4520-9860 MPa.s which is obviously greater than viscosity (3490-3610 MPa.s) of the adhesive prepared according to the methods 1-3.

The invention discloses a preparation method of a Ni-SiC compound coating on the surface of an aluminum alloy. The preparation method adopts an anode type surfactant which is hexadecyl trimethyl ammonium bromide for replacing a cathode type surfactant which is lauryl sodium sulfate adopted by the invention at present. The preparation method is characterized by increasing the concentration of an anode activator NiCl2 while reducing current density and the concentration of silicon carbide in a plating solution, obtaining a fine and dense compound coating at an electroplating rate of 1-2 micron per minute, stirring by using air with volume flow being 4-7L / min and fully dispersing the silicon carbide, simultaneously adding CTAB to improve the wettability of the silicon carbide and obtain a fine and dense compound coating with high content of uniformly-dispersed silicon carbide. Through the preparation method of the Ni-SiC compound coating on the surface of the aluminum alloy, the technical problem of low tensile performance and low abrasion resistance of the aluminum alloy can be solved; the Ni-SiC compound coating with high adhesion strength, high content of uniformly-distributed hard silicon carbide particles, high hardness and high abrasion resistance can be prepared on the surface of the aluminum alloy.

The invention relates to the field of chemical engineering, in particular to a high-performance waterborne inorganic paint and a preparation method thereof. The high-performance waterborne inorganic paint, provided by the invention, comprises the following ingredients in parts by weight: 20-35 parts of silica sol, 5-15 parts of a polymer solution, 5-15 parts of a pigment, 15-30 parts of a filling agent, 0.5-1.5 parts of a foam breaking agent, 1-2 parts of a coalescing agent, 0.05-0.5 part of a thickening agent, and 20-35 parts of water. The waterborne inorganic paint introduces an organic macro molecule solution, so as to optimize the ratio of pigment, the filling material, the foam breaking agent and the coalescing agent, and obtain the high-performance waterborne inorganic paint which is environment-friendly and has remarkably strong adhesion, good leveling property and glossiness property, as well as other characteristics; the preparation method is simple and reliable, and is low in manufacturing cost, thereby being suitable for industrial manufacture and application.

The invention discloses a method for synthesizing diamide podand extraction agent, wherein chloro-carbonic ester and diglycolic anhydride react to generate mixed anhydride under the action of tertiary amine, and then the reaction is performed with amine to generate the diamide podand extraction agent. The method has mild reaction condition, can be performed at a low temperature, and has high reaction speed and short consumed time; the product purification operation is simple and easy; the obtained diamide podand extraction agent can meet the extraction purity requirement, and is beneficial to establishing flow that the diamide podand is used for treating high-level liquid waste in spent fuel reprocessing plant; the used chloro-carbonic ester is easy to prepare and has a low price, therefore, the cost for preparation of a great amount of extraction agent is greatly reduced; and besides, the yield of the extraction agent is high, so that the method is very suitable for industrial production and application.

The invention relates to a preparation method for a microarray biochip. M print spray heads are used to constitute a spray head group, the spray heads are installed in the direction parallel to the X direction, and are arranged along the Y direction; a biochip substrate and the spray head group move step by step relatively along the Y direction, the action of a corresponding nozzle on the spray head corresponding to each step position is controlled by a driving signal, and a biomolecule solution of one index is sprayed onto the preset position of one or a plurality of microarray biochip substrates arranged along the X direction; and through the sequential action of the M spray heads, the biomolecule solutions of M indexes are sequentially sprayed onto the preset position of the biochip substrate to form a sample application array. The preparation for the microarray biochip used for multi-index and multi-user parallel detection can be realized. Compared with the existing product, the biochip prepared in the method disclosed by the invention has the characteristics of high speed, high precision, wide applicability, high efficiency, small cross contamination, easiness in maintenance and use, low manufacturing cost and the like, and the method is very suitable for the large-scale production of microarray biochips and is also suitable for scientific research and application.

The invention belongs to the field of carbon materials, and concretely relates to a nitrogen-doped carbon material, and a preparation method and an application thereof. The prearatio method comprisesthe following steps: calcining glucose used as a raw material in an inert atmosphere using melamine used as a nitrogen source to a certain temperature to obtain a carbon substrate, mixing the carbon substrate with melamine in an aqueous solution according to a certain ratio, performing heating and stirring, drying the obtained material, and calcining the dried material in the inert atmosphere at alow temperature in order to obtain the nitrogen-doped carbon material. The preparation method has the advantages of simplicity, low energy consumption and low cost, and the nitrogen-doped carbon material has a very high reactivity, and can selectively degrade a plurality of organic pollutants, so the technical problems of complexity and high cost of preparation methods of the nitrogen-doped carbon material in the prior art and the technical problem of limited ability to degrade the organic pollutants in the environment are solved.

The invention relates to the technical field of materials, in particular to a metal organic framework material, a synthetic method and an application thereof. The X-ray diffraction peak positions of power of the framework material are as follows: 7.95+ / -0.5, 11.43+ / -0.5, 15.80+ / -0.5, 16.77+ / -0.5 and 18.89+ / -0.5; the 2theta angle range is between 5 degrees to 60 degrees. The material has the beneficial effects that the invention provides a novel metal organic framework material which has relatively high porosity, excellent water stability and heat stability and has a wide application prospect in the fields of photo-catalysis, hydrogen storage and ultraviolet resistance. Meanwhile, the synthetic material is low in price and easily available in raw material. The synthetic method is simple andlow in cost, can carry out amplified production on the premise of not affecting the product performance, and is suitable for industrial production and application.

The invention discloses a method for preparing a TiC-reinforced copper-based electric contact composite material. The preparing method includes the steps of raw material preparation, carbon source manufacturing, powder briquetting and sintering, TiC self-forming reaction synthesis and the like. The method for preparing the TiC-reinforced copper-based electric contact composite material has the characteristics that the preparation technology is simple and stable, cost is low, efficiency is high and the method is suitable for industrial production and application. The carbon source used in the preparing method refers to Cu-graphite coated TiC mixed powder obtained by ball milling, the grain size of synthesized TiC is 0.5-2.0m, and TiC grains are evenly distributed on a copper substrate. Theprepared TiC-reinforced copper-based electric contact composite material is high in compactness, good combination of the strength, hardness, electrical conductivity and thermal conductivity of the composite material can be realized by adjusting the content of the TiC, and the high-strength and high-conductivity characters are achieved.

The invention discloses a method and system for combined treatment of household rubbish and fly ash. The method comprises the steps of conducting pretreatment on the household rubbish, and obtaining the smashed and pretreated rubbish in which inorganic substances are removed; conducting drying treatment and pyrolysis treatment on the pretreated rubbish in a revolving bed pyrolyzing furnace so as to obtain pyrolytic carbon and pyrolytic oil gas; conducting oil-gas separation treatment on the pyrolytic oil gas so as to obtain pyrolytic tar and pyrolysis gas; burning the pyrolysis gas and the fly ash in a fusion furnace so as to make the fly ash fuse and solidify heavy metals to obtain a glassy-state solid substance. According to the method, harmless and reduction treatment of the household and the fly ash can be achieved, the cost is low, the method is environmentally friendly, and the method is particularly applicable to industrialized application and promotion.

The invention discloses a preparation method for a TiC / Ti5Si3 composite enhanced copper-based electrical contact material. The preparation method comprises the following steps of preparation of raw materials, preparation of graphite-coated Sic mixed powder, preparation of Cu-graphite-coated Sic prefabricated body, reaction synthesis of TiC / Ti5Si3 and the like. The preparation method has the advantages of being simple in preparation process, low in cost and high in efficiency, and the prepared TiC / Ti5Si3 composite reinforced copper-based electrical contact material has high hardness, high wearresistance and high conductivity, and is suitable for industrial production and application; and Tic is obtained through self-generation reaction of Ti, graphite and Sic in a copper melt, the Tic is near-stoichiometric, the stability is good, the particle size is in the range of 0.5-3.5 micrometers, the Tic is uniformly distributed on a copper substrate, and prepared Ti5Si3 is rod-shaped or plate-shaped.

The invention discloses a high-concentration erbium ion doped tellurium tungstate glass capable of emitting light at mid-infrared 2.7 microns. The glass comprises the following components by molar percent: 58-70% of TeO2, 15-25% of WO3, 0-15% of La2O3, 0-15% of LaF3 and 2-4% of Er2O3. The glass is prepared by adopting an electric furnace melting method of a corundum crucible and a silicon carbide rod. The glass is high in doping concentration of erbium ion, high in infrared transmittance near to the mid-infrared 2.7 microns and good in physicochemical properties; and the stability parameter delta T is not less than 180 DEG C. Strong mid-infrared 2.7 microns fluorescence is obtained under pumping of a laser diode with a wavelength of 980 nm; and the glass is suitable for preparation and application of erbium ion doped special glass and optical fiber materials capable of emitting light at mid-infrared 2.7 microns.

The invention belongs to the field of biochar preparation, and particularly relates to a method for preparing biochar from waste biomass pyrolysis residues and the obtained formed biochar. To overcome a technical problem, the invention provides the method for preparing the nitrogen-doped formed biochar from the waste biomass pyrolysis residues. The method comprises the following steps: uniformly mixing the biomass pyrolysis residues and a nitrogen source, then adding a binder, conducting uniform mixing, carrying out extrusion molding, performing drying, and then carrying out oxidation, carbonization and activation to obtain the nitrogen-doped formed biochar. The method is simple in process and low in cost, and the obtained biochar has a good catalytic oxidation or / and adsorption effect on acid gas.

The invention relates to a purification method for high-purity organic solvent normal propyl alcohol. The method includes steps: subjecting raw normal propyl alcohol to removal of high ultraviolet absorption impurities by the aid of activated carbon, utilizing desiccants such as anhydrous calcium sulfate or calcium hydride for drying and dehydration, rectifying, filtering and packaging to obtain the high-purity organic solvent normal propyl alcohol. By the purification method for the high-purity organic solvent normal propyl alcohol, chromatographic-grade normal propyl alcohol products with the purity higher than 99.8% can be obtained, the yield is higher than 95%, the acceptance rate is higher than 93%, and application requirements of users in aspects of scientific researches, subject studies and the like of the high-purity organic solvent (HPLC) normal propyl alcohol can be met. In addition, compared with conventional methods, the purification method for the high-purity organic solvent normal propyl alcohol is high in product purity, simple and convenient to operate and stable in product quality and can be used for large-scale production.

The invention discloses a preparation method of edible water balls by performing synthesizing on pectin extracted from tamarind seeds. The preparation method of the edible water balls by performing synthesizing on the pectin extracted from the tamarind seeds comprises the following steps: performing pretreatment on tamarind seeds; preparing tamarind seed gum powder; performing hydrolyzing, decoloring and precipitating on the tamarind seed gum powder; and preparing the edible water balls. A gelation technology is effectively used during the preparation process of the edible water balls. The edible water balls are synthetized by using sodium alginate, the tamarind gum and the like as raw materials, wherein the added tamarind gum extracted from the tamarind seeds has high hydrophilicity; so that, very well protecting and stabilizing effects can be achieved during the preparation processes of the edible water balls. Thus, the prepared edible water balls are not liable to break, and stablerin performance; moreover, membrane of the prepared edible water balls is tougher, more translucent, brighter and easier to degrade, so that the current environment protection theme are better met. The preparation method of the edible water balls by performing synthesizing on the pectin extracted from the tamarind seeds effectively solves the environment protection problem of existence of plasticparticles in plastic bottles, so that the preparation method of the edible water balls is suitable for industrial and large-scale production; and thus, the preparation method of the edible water ballsis wide in application range, as well as suitable for large-scale promotion and application.

The invention relates to a purification method of highly pure organic solvent n-propanol. The method comprises the following steps of: removing the impurities with high ultraviolet absorption in the raw material n-propanol by active carbon; drying and dewatering the treated n-propanol by a drying agent of anhydrous calcium sulphate or calcium hydride; rectifying; filtering; and packing to obtain the highly pure organic solvent n-propanol. The purification method provided by the invention can obtain the chromatographic-grade n-propanol product with the purity more than 99.8%; the yield of the n-propanol is more than 93%; the qualified rate of the n-propanol is more than 93%; the application need of users of highly pure organic solvent n-proanol (HPLC) (high performance liquid chromatography) in the scientific research and the subject research can be satisfied; compared with the traditional methods, the n-propanol obtained by the method provided by the invention is high in the purity; the operation is simple; the quality of the product is stable, and thus the method can be applied to the large-scale production.

The invention relates to the field of separation purification of natural products, and provides a method for efficiently separating and purifying caffeoylquinic acid isomers from mulberry leaves. Themethod comprises the following steps: performing ultrasonic wave enhanced extraction on the mulberry leaves, and performing separation purification by adopting an original pH induction liquid-liquid extraction technology, a macroporous adsorption resin enrichment technology and a high-speed countercurrent chromatography rapid separation technology to obtain the three caffeoylquinic acid isomers with purity of 93% or more. According to the method provided by the invention, caffeoylquinic acid rapidly enters an organic phase by the pH induction liquid-liquid extraction to reduce extraction times, so that the time is saved, chemical reagent consumption is reduced, and the industrial costs are reduced; and the method realizes the purpose of separating the caffeoylquinic acid isomers from the mulberry leaves by using the high-speed countercurrent chromatography rapid separation technology for the first time, the method has the advantages of simple steps, low solvent consumption, a short separation period, high product purity and a high yield, and is suitable for industrial production and application.

The invention provides an event-driven spiking neuron simulation algorithm based on a single exponential kernel. Compared with a traditional spiking neuron model, according to the algorithm, a singleexponential kernel function is used, the efficiency of the spiking neuron model is greatly improved, the delay degree of the spiking neuron model to input information is reduced, the recognition accuracy and robustness of the spiking neuron model are improved, and the method is more suitable for development and application of software and hardware platforms of brain-imitated architecture. Meanwhile, a method based on event driving is adopted, calculation is driven by pulses, and the method can efficiently process pulse modes.

The invention discloses a planting method of lycopersivonesculentum. The planting method comprises the steps of 1, seed selection and seed pretreatment; 2, seedling bed preparation; 3, seed sowing andseedling raising; 4, field planting preparation; and 5, field planting and pruning. The planting method of the lycopersivonesculentum has the advantages that through the combination of the above steps, the problems of poor quality and low yield of the lycopersivonesculentum caused by fruit deformity existing in the present planting can be effectively solved, the industrialization can also be achieved, the production efficiency of fine breeds is improved, the development of the lycopersivonesculentum industry is promoted, while the territorial economy is actively promoted and local brands arecreated, technical guidance and reference are also provided for efficiently planting the lycopersivonesculentum in picking, leisure and sightseeing-type modern agriculture parks; the planting method of the lycopersivonesculentum is applied to industrialization and scale production, the application prospect is wide, and the planting method is applied to wide-range promotion and application.

The invention relates to a single system micro-service splitting method based on domain event driving. The method is technically characterized by comprising: constructing a domain event model, and generating a multi-dimensional interface relevancy comprehensive matrix; identifying candidate micro-services from the multi-dimensional interface relevancy comprehensive matrix; according to the candidate micro-service, constructing a micro-service interface calling relation chain of each layer, and performing decoupling processing to obtain a micro-service result; and evolving each micro-servitization result from a three-layer architecture mode to a domain-driven design layered architecture mode. The concept of field-driven design is combined, the method does not depend on specific software components, needed relevant information is directly mined from single application, a single system is described into a field event graph model, in the process, and the method more pays attention to the essence of micro-service splitting instead of a certain specific software technology. Therefore, the splitting method is basically not restricted by a specific development technology, and can be well suitable for most of application programs.

The invention relates to the technical field of planting of fruits, in particular to a purple tomato planting method. The planting method comprises the following steps of (1) selection of seeds; (2) preparation of a culture medium, wherein the culture medium is exposed under the sun for 1-2 days and then covered with plastic film for one day for use; (3) sowing, wherein the small tomato seeds after soaking in step (1) are dibbled in a seedling raising bed on which the culture medium processed in step (2) is laid, the seeds are covered with soil with the thickness of 2.4-2.8 cm after sowing, watered thoroughly and placed indoors for light treatment for 10-12 hours every day, and field planting is carried out when 4-6 leaves grow out on each seedling; (4) field planting; (5) fertilization management; (6) harvesting, wherein small tomatoes are harvested in 2-3 days after ripening. According to the purple tomato planting method, the yield is high, the nutritional value of the purple tomatoes is high, and the production efficiency of an improved variety is improved.

The invention relates to a fluorescent material, a preparation method thereof and a method for measuring temperature. The chemical formula of the material is Nd0.02Gd0.98TaO4, wherein two thermal coupling sub energy levels of the Nd3+ ion 4F3 / 2 energy level jump to the highest energy sub energy level of the 4I9 / 2 energy level to form two independent fluorescent peaks, which is beneficial to the observation of fluorescence signals; the peak intensity ratio of the two fluorescent peaks changes significantly with temperature, and sensitivity is higher in a wider temperature range; blue shift occurs in the energy of the fluorescent peaks in which the the lowest sub energy level of the Nd3+ ion 4F3 / 2 energy level jumps to the highest energy sub energy level of the 4I9 / 2 energy level as the temperature increases, and peak position change and temperature change can maintain a very good linear relationship in the temperature range of 40-600K; the method has good temperature sensitivity and wide application prospects.

The invention provides a method for preparing a tungsten carbide-titanium dioxide composite catalyst. The method comprises the following steps of: preparing an ammonium tungstate solution and a titanium solution respectively from tungsten waste and a titanium-containing waste cinder box material serving as raw materials; adding an inorganic dispersant solution and an organic surfactant solution; and performing stirring heating, vacuum drying, carbonization reduction and the like to obtain the tungsten carbide-titanium dioxide composite catalyst. Due to the adoption of the method, the production cost is reduced, a good economic benefit is achieved, recycling of tungsten waste and titanium waste is facilitated simultaneously, uniform liquid-liquid mixing of a titanium liquid and the ammonium tungstate solution can be realized, and the eka-platinum catalytic activity of tungsten carbide is increased finally by using the photoelectrocatalysis performance of titanium dioxide.

The invention relates to a remote monitoring system based on matrix NB-IoT intelligent water meter. The system comprises matrix NB-IoT intelligent water meters, a NB-IoT Internet of things and a cloudplatform. Each of the matrix NB-IoT intelligent water meters comprises a controller, a plurality of base meters and flow sensors installed on the base meters, and a flow sensor on each base meter isconnected to the controller. The matrix NB-IoT intelligent water meters are connected to the cloud platform through the NB-IoT Internet of things to realize a remote monitoring function. According tothe invention, a main control module can mount the matrix NB-IoT intelligent water meters with the multiple base meters to perform data transmission with the cloud platform, the electromechanical conversion and data collection and recording are performed through the main control module and the multiple base meters, the data exchange with the cloud platform is carried out, the material cost can begreatly reduced without reducing the performance of the water meters, and the cost of reconstructing a NB-IoT remote intelligent water meter can be greatly reduced due to low cost.

The invention discloses a flat band bonding machine. The flat band bonding machine comprises a rack, a control system, a supporting frame, a lower pressing strip, heating sheets, a temperature sensor, a fixed plate, an air cylinder, an upper pressing strip and an iron sheet, wherein the control system is arranged in the rack; the supporting frame is arranged on one side of the top of the rack; a groove is formed in the middle part of the supporting frame; the lower pressing strip is longitudinally fixed on the groove; a plurality of heating sheets are arranged on the lower pressing strip; the temperature sensor is additionally arranged on one side of the lower pressing strip; the fixed plate is arranged above the supporting frame; the air cylinder is arranged on the fixed plate; the upper pressing strip is arranged below a telescopic rod of the air cylinder; the upper strip is located between the fixed plate and the lower pressing strip; the iron sheet is arranged below the upper pressing strip; the temperature sensor, the air cylinder and the heating sheets are respectively connected with the control system. The flat band bonding machine disclosed by the invention has the advantages that the production efficiency is high, the operation is simple, the blank of polyurethane flat band production equipment in the market is filled, the bonding firmness is high, the market demands are well satisfied and the flat band bonding machine is suitable for being widely popularized and used.

The present invention provides a food sewage treatment flocculant preparation method, which comprises: dissolving dimethyl diallyl ammonium chloride and an acrylamide monomer in distilled water according to a ratio of 1:1-10 to form a solution with a concentration of 20-40 wt%; respectively preparing potassium persulfate and sodium sulfite as initiators, and preparing cerium sulfate as a catalyst; taking liquid water glass with a modulus of 2.8-3.5, diluting the water glass with water, adjusting the content to achieve a silica content of 2-10 wt%, loading the solution onto an exchange column filled with a cation exchange resin to obtain a silica sol dilute solution with a sodium oxide content of less than 1 wt% and the pH value of less than 1-4; and carrying out reaction polymerization to obtain the food sewage treatment polysilicic acid / polyacrylamide composite flocculant. According to the present invention, the flocculant is used for food sewage treatment or drinking water and wastewater treatment, can effectively remove floating impurities and water-soluble pigments in food sewage, and is suitable for industrial production and applications.