140results about How to "Increase added value" patented technology

The invention relates to an anorthite material and a preparation method thereof. The adopted technical proposal comprises the following steps of: according to (ZL200510019664.3) patent technology, namely a method for preparing titanium and a titanium alloy by utilizing titanium-containing furnace slag, taking molten tailings which is extracted with the titanium alloy as a raw material, adding 20 to 50 weight percent of silica, 0 to 60 weight percent of clay and 0 to 40 percent aedelforsite, and cooling a melt to obtain the anorthite material after the mixture is completely molten and a bath composition is uniform; or taking cold tailings extracted with the titanium alloy as the raw material, adding 20 to 50 weight percent of the silica, 0 to 60 weight percent of the clay and 0 to 40 percent the aedelforsite, carrying out mix grinding on the raw material and the admixture until the particle size is less than 0.1 mm, performing blank compression, and calcining the mixture at a temperature of between 1,200 and 1,400 DEG C to obtain the anorthite material. The method takes the tailings extracted with the titanium as the raw material, saves precious bauxite resources, has low cost, ensures that industrial residue is utilized with high added value, is environment-friendly and has simple process.

This invention discloses a resource-based treatment system and method for barium sulfide slag. The system involves crushing and leaching the barium sulfide slag using a pretreatment unit, thereby leaching out the barium sulfide. The barium-enriched washing solution is then processed through an electrophoretic deep treatment unit to achieve high-value recovery of sulfur and barium elements, ultimately realizing the resource utilization of the barium slag. The entire process is pollution-free and has the advantages of being environmentally friendly, having high added value, high sulfur utilization efficiency, low cost, and simple operation. It is suitable for large-scale industrial applications and has broad market prospects and significant economic benefits.

This invention relates to a processing method for soft and tender abalone with a soft, glutinous texture, comprising the following steps: S1, pre-treating fresh abalone to obtain pre-treated abalone meat; S2, placing the pre-treated abalone meat under hot air conditions, first heating it to a first temperature and holding it at that temperature, then raising the temperature to a second temperature and holding it at that temperature, to obtain enzyme-inactivated abalone meat; the first temperature does not exceed 55°C, and the second temperature is at least 10°C higher than the first temperature; S3, enzymatically hydrolyzing the enzyme-inactivated abalone meat with a protease, and after inspection and packaging, obtaining soft and glutinous abalone with a soft, glutinous texture. This invention, through gradient temperature inactivation of enzymes and three-parameter synergistic regulation of enzymatic hydrolysis, produces soft and glutinous abalone with a sticky adductor muscle adhesiveness >25N, a soft, glutinous texture uniformity >90%, and a 100% success rate in achieving the desired soft and glutinous texture. The method of this invention is simple and can achieve large-scale and continuous production. It is suitable for the industrial processing of high-end ready-to-eat soft-boiled abalone, pre-cooked soft-boiled abalone, and other products, significantly improving the added value and market competitiveness of abalone products.

The invention relates to the field of blood products, in particular to a preparation method of human activated C1 esterase. The preparation method comprises the following steps: carrying out contact adsorption on cryoprecipitate-removed human plasma and anion exchange resin, washing and eluting to obtain an eluent containing C1 proesterase, carrying out membrane filtration, and carrying out ultrafiltration desalination treatment; adding an anionic substance into the eluent, incubating in vitro to effectively activate the C1 esterase, and filtering by a membrane to obtain a feed liquid containing the activated C1 esterase; and carrying out purification treatment on the feed liquid to obtain the human activated C1 esterase, and carrying out cryopreservation. According to the method, an anion substance is introduced into an eluent system obtained through anion exchange, mild and effective activation of the C1 proesterase is achieved under the condition of not depending on foreign proteolytic enzyme, the risk of non-specific hydrolysis and self-cutting inactivation is remarkably reduced, good synergy is formed with a follow-up purification process, and the method is suitable for industrial production. The human activated C1 esterase product with relatively high activity and good stability is obtained.

This invention discloses a method for large-scale breeding of all-male salmon and trout, belonging to the field of fish sex regulation breeding technology. The method includes: collecting fertilized eggs from different families of the same species of salmon and trout, artificially incubating them to obtain fry, and inducing sex reversal in the fry by using 17β-estradiol when they begin feeding; subsequently, raising the fry to sexual maturity, selecting individuals with a female phenotype, and then using sdY as a sex identification gene, selecting pseudo-females with genotype XY by quantitative real-time PCR; pairing the sexually mature pseudo-females with genotype XY with normal males with genotype XY, and obtaining super-males with genotype YY through artificial insemination; pairing the sexually mature super-males with females with genotype XX, and producing all-male salmon and trout with genotype XY on a large scale through artificial insemination. This invention overcomes the problem that existing technologies cannot achieve large-scale breeding of all-male salmon and trout.

This invention discloses an optimized extraction and purification process for total flavonoids from Hypericum perforatum and its application in photodamage protection. Belonging to the field of natural product extraction technology, the process includes the following steps: using Hypericum perforatum powder as raw material, ultrasonic-assisted extraction is performed, followed by centrifugation, collection of the supernatant, and repeated extraction of the residue twice. The supernatants are combined to obtain a total flavonoid extract from Hypericum perforatum. The extract is then purified by adsorption using a macroporous adsorption resin, and the eluent is collected, concentrated, and dried to obtain high-purity total flavonoids from Hypericum perforatum. This invention features a stable process, high extraction efficiency, and is environmentally friendly, making it suitable for industrial production. The prepared total flavonoids from Hypericum perforatum exhibit high purity and significant antioxidant and photoprotective effects, and can be widely used in antioxidant, skin protection, and sunscreen products.

The invention discloses a method for comprehensively recovering valuable elements from waste acid, the waste acid contains copper, nickel and arsenic, the concentration of copper in the waste acid is 25g / l-70g / l, the concentration of arsenic in the waste acid is 5g / l-50g / l, the concentration of nickel in the waste acid is 2g / l-25g / l, and the concentration of acid in the waste acid is 70g / l-220g / l, and the method comprises the steps of evaporative crystallization, membrane dialysis, primary neutralization and secondary neutralization. According to the method, the copper recovery rate is not lower than 98%, the nickel recovery rate is not lower than 90%, and the arsenic recovery rate is not lower than 80%. According to the invention, neutralization is carried out after evaporative crystallization and membrane dialysis, so that the alkali consumption can be reduced by 40-60%, and the treatment cost is reduced.

The invention discloses a nitrate-free smoked ginseng sausage and a preparation method thereof, and belongs to the technical field of meat product processing. The method comprises the following steps: adding different addition amounts of ginseng powder into a nitrate-free smoked sausage to prepare the nitrate-free smoked ginseng sausage, mincing pork serving as a main raw material, adding water, plasma activated water, beet root powder, celery powder, ginseng powder and nisin, and uniformly stirring to prepare the nitrate-free smoked ginseng sausage. The preparation method comprises the following steps: uniformly stirring other ingredients including table salt, white granulated sugar, monosodium glutamate, potato starch, soybean protein isolate, pepper powder and ginger powder, pickling, filling, cooking, drying to be mature, cooling, and packaging in vacuum to obtain the nitrate-free ginseng smoked sausage. According to the method, the flavor quality and functional characteristics of the nitrate-free smoked sausage are optimized, the defects of a single nitrate-free smoked process in flavor level and nutritional added value are overcome, and the flavor and texture of the sausage are remarkably improved.

The invention discloses a granular bio-fertilizer and a preparation method thereof, and the granular bio-fertilizer comprises the following components in percentage by weight: 94-97% of a base fertilizer, 2-5% of a synergist and 1-2% of an auxiliary agent. The granular bio-fertilizer is a fertilizer prepared by compatibility of one of an inorganic fertilizer, an organic fertilizer and an organic and inorganic fertilizer with a bio-fertilizer synergist. The granular bio-fertilizer disclosed by the invention can adopt an inorganic fertilizer, an organic fertilizer or an organic and inorganic fertilizer as a base fertilizer, can be suitable for almost all granular fertilizers (except for fertilizers with a killing function on microorganisms or an antagonistic effect on components in a bio-fertilizer synergist) in the current market, and is simple in production process, relatively low in cost and suitable for industrial production. Moreover, the added value of the product can be effectively improved, and the production process belongs to a novel fertilizer production process and has a huge market popularization value.

The invention discloses a method for recovering valuable elements in liquid obtained after bauxite wet desulphurization, and relates to the technical field of bauxite resource utilization. Comprising the following steps: carrying out ceramic membrane filtration pretreatment on the bauxite wet desulfurization liquid to remove impurities; the silicon element is recycled in a targeted manner through a compound flocculation-calcination process to obtain the white carbon black; the iron element is recycled through ozone oxidation-ammonium bicarbonate precipitation, and high-purity iron oxide is prepared; separating and purifying an aluminum element through a seed crystal induction-calcination process to obtain metallurgical-grade aluminum oxide; a fluorine-containing precipitant is used for selectively precipitating and recovering magnesium element to obtain a high-quality magnesium salt product; and neutralizing the tail liquid, and discharging after reaching the standard. According to the method, accurate separation and high-valued utilization of four elements of aluminum, iron, silicon and magnesium are realized through a synergistic process of targeted recovery of silicon, gradient separation of iron and aluminum and selective precipitation of magnesium, and the problems of silicon resource waste, low element separation efficiency, insufficient product purity, secondary pollution and the like in a traditional process are thoroughly solved; all-component resource comprehensive utilization of desulfurized liquid resources is achieved.

The invention belongs to the technical field of construction waste sorting and recycling, and particularly discloses a construction waste particle sorting device which comprises a mounting box, one side of the mounting box is fixedly connected with a first discharging shell, and the other side of the mounting box is fixedly connected with a second discharging shell communicating with the first discharging shell. And the top of the mounting box is fixedly connected with a third discharge shell. By arranging the separation mechanism, the three functions of particle size screening, wind power sorting and magnetic separation impurity removal are organically combined in the same device, and the technical problems that traditional sorting equipment is single in function and needs multi-machine linkage are solved; according to the technical scheme, adsorption separation of metal substances, wind separation of light materials and screening classification of aggregates with different particle sizes are sequentially completed, finally, metal materials, light sundries and heavy aggregates are output through three independent discharging channels correspondingly, efficient fine separation of construction waste is achieved, and the purity and the additional value of recycling products are remarkably improved.

The invention relates to amino acid modified red-mud-based magnesium-iron-aluminum hydrotalcite and a preparation method and application thereof.The preparation method comprises the following steps that red mud and inorganic acid are mixed and heated and leached under the stirring condition, an obtained leaching product is subjected to solid-liquid separation, and upper-layer acid leaching liquid containing iron and aluminum and residues are obtained; mixing the obtained upper-layer acid leaching solution with amino acid to obtain a mixed solution; adding magnesium salt into the obtained mixed solution, and carrying out coprecipitation reaction to obtain turbid liquid; and centrifuging, washing and drying the obtained turbid liquid to obtain the amino acid modified red mud-based magnesium-iron-aluminum hydrotalcite. Iron and aluminum elements in the red mud are directly extracted, the cost is reduced, and meanwhile the performance and the additional value of the hydrotalcite product prepared from the red mud are remarkably improved; amino acid molecules are introduced, the crystallinity, the specific surface area and the adsorption capacity of the magnesium-iron-aluminum hydrotalcite are improved, a co-precipitation reaction is adopted, the reaction temperature is low, the reaction time is short, and the prepared amino acid modified red-mud-based magnesium-iron-aluminum hydrotalcite can be used for treating phosphorus-containing wastewater.

The invention relates to the technical field of regenerated fiber manufacturing, in particular to a method for preparing filament fibers from waste PET (polyethylene terephthalate) materials, which comprises the following steps: raw material pretreatment, ultrasonic-assisted depolymerization, continuous polymerization and functional modification, melt direct spinning, grinding of waste yarns in a chemical fiber factory, crushing of waste PET bottles, grinding after cleaning, and obtaining of PET powder; the method comprises the following steps: mixing PET powder with ethylene glycol according to a molar ratio, generating BHET under the action of ultrasonic waves, sequentially carrying out esterification, pre-polycondensation and final polycondensation on the BHET to obtain a regenerated PET melt, adding a modified additive in the esterification reaction, spinning the regenerated PET melt by adopting a one-step process, cooling by cooling air, and winding to obtain the filament fiber. The problems that traditional regenerated PET fibers are single in raw material, complex in process and insufficient in performance are solved, low-cost and high-efficiency preparation of semi-dull, flame-retardant, cationic dyeable and other multifunctional products is achieved, and high-value utilization of waste PET is improved.

The application discloses a kind of synthetic leather preparation methods with perspective superimposed type light temperature double response effect, comprising the following steps: high transparent ultraviolet light variable surface material slurry is scraped on release paper, and transparent light variable surface layer is formed by drying;Color temperature change medium slurry is scraped on transparent light variable surface layer, and color temperature change layer is formed by drying;Adhesive bottom layer slurry is scraped on color temperature change layer, bottom layer is formed in semi-dry state, and is adhered with microfiber base material, after drying and curing, release paper is stripped, and synthetic leather is obtained;Transparent light variable surface layer allows most visible light to pass through and discolor under ultraviolet light irradiation, color temperature change layer has initial undertone and discolors when temperature changes, and the two superimposed realize light temperature double response dynamic visual effect.By constructing the optical coupling structure of high transparent light variable surface layer and color temperature change layer, four kinds of certainty, designable visual state of synthetic leather under different light and temperature environment are realized, thereby creating unprecedented dynamic interactive experience and decoration function of synthetic leather.

The application belongs to the technical field of catalyst preparation, and relates to a preparation method and application of a CoCuNiPtRu high-entropy alloy nanoparticle catalyst. A one-pot wet chemical method is used to uniformly mix 4-amino pyridine solvent and metal precursors, and then ascorbic acid is quickly added for reduction in an oil bath at 95 DEG C. After reaction, washing and drying, the catalyst is obtained. The method has the advantages of simple process and convenient operation. The obtained catalyst has high activity and selectivity in catalytic degradation of polylactic acid waste plastics under alkaline conditions, can efficiently upgrade and convert the polylactic acid waste plastics into acetic acid, provides a new way for resource utilization of waste plastics, and has good environmental protection and resource recycling prospects.

This invention relates to a copper oxide material, its preparation method, and its application. The preparation method includes: mixing an inorganic base, a dispersant stabilizer, and a copper salt in water to form a raw material solution; carrying out a precipitation reaction; washing and drying the precipitated product to obtain the copper oxide material; the pH value of the raw material solution is 13.10-14; the copper salt includes copper acetate. This invention also provides the copper oxide material obtained by the above preparation method and its application in the electrocatalytic reduction of carbon dioxide. The preparation method is simple and controllable, and the prepared copper oxide material exhibits high electrocatalytic carbon dioxide reduction performance.

The present application relates to the preparation method of carboxyl endocyclic anhydride and the preparation product. The preparation method of compound of formula (II) comprises the following steps: reacting compound of formula (I) with a cyclization reagent to generate compound of formula (II) and acid, and using an epoxide compound as an acid scavenger. The present application is a new synthesis method of carboxyl endocyclic anhydride, which has the advantages of low cost, low requirement for reagents, site and equipment, mild conditions, wide substrate application range, high functional group tolerance, recyclable solvent and other high value-added by-products in the synthesis route, less waste liquid discharge, easy scale-up, high industrial and academic value, and the like, and can greatly promote the rapid large-scale production and application of polyamino acid, polyhydroxy acid (polyester), polymercaptan acid (polythioester) and the like.

The invention belongs to the technical field of comprehensive recovery of scattered metal tellurium, and particularly relates to a method for recovering copper and tellurium from copper telluride slag. According to the method, metal copper and metal tellurium are effectively recovered through directional oxidizing roasting, water leaching copper and tellurium separation, alkaline leaching impurity removal and tellurium enrichment and neutralization and precipitation of tellurium dioxide, and meanwhile enrichment of precious metal with the extremely low content in the raw materials is completed; according to the method, the metal copper and the metal tellurium can be efficiently recovered from the copper telluride slag, the production process is simple, the recovery rate of the copper reaches 99% or above, the recovery rate of the tellurium can reach 90% or above, and the purity of tellurium dioxide is larger than 98%.

This invention discloses a porous carbon-supported copper catalyst, its preparation method, and its application, belonging to the field of catalyst preparation technology. The invention uses three-dimensional interconnected ordered porous carbon (NCP) with a large-pore structure as a support, tetraphenylporphyrin copper(II) and tetraphenylporphyrin as nitrogen and copper sources, and KOH or NaOH as activators. An NCP precursor adsorbed with tetraphenylporphyrin copper(II), tetraphenylporphyrin, and an alkaline component is obtained through a two-step adsorption process. This precursor is then pyrolyzed at 600-900℃ under nitrogen protection, cooled to room temperature, and washed with water to obtain the porous carbon-supported copper catalyst (NCP@NC-Cu). This catalyst retains a three-dimensional interconnected porous structure, with the active component (copper species) mainly distributed within the pores of the NCP support, and possesses a large specific surface area and abundant nitrogen. The catalyst was applied to the N-formylation reaction of amines with CO2 and H2 to prepare formamide compounds, exhibiting excellent catalytic activity, recyclability, and good substrate versatility, showing promising application prospects.

This invention provides a method for preparing low-arsenic anhydrous hydrogen fluoride, relating to the field of hydrogen fluoride preparation technology. The preparation method includes the following steps: (1) crude hydrogen fluoride from a storage tank is passed through a primary distillation column to obtain anhydrous hydrogen fluoride. The anhydrous hydrogen fluoride is then introduced into a pretreatment tank, and potassium permanganate solution is added for stirring and reaction to obtain a mixture; (2) the mixture is sequentially passed into a secondary distillation column and a tertiary distillation column for distillation to obtain low-arsenic anhydrous hydrogen fluoride. This invention changes the non-acid-discharge method of the primary distillation column to an acid-discharge method, and sets a pretreatment process between the original primary and secondary distillations to effectively utilize potassium permanganate solution for arsenic removal. Then, the arsenic compounds in the product are oxidized and carried away through the distillation column, thereby effectively purifying the product without generating new hazardous waste. This method can increase the continuous production capability of existing hydrogen fluoride production systems without major modifications.

The application discloses a kind of converter steel slag grading efficient resource utilization method, comprising the following steps: (1) converter steel slag pretreatment, liquid converter steel slag is sequentially crushed by rolling, hot stew under pressure, rod grinding and impurity removal process to obtain pretreated steel slag;(2) grading screening, pretreated steel slag is graded using a mobile five-layer vibrating screen;(3) product adaptation treatment, 16-63mm products are used as railway ballast;5-10mm, 10-15mm products are used as road asphalt surface layer aggregate;<8 mesh products are used as steel slag sand for rust removal (4) wastewater, dust treatment and metal, waste heat recovery treatment.The application greatly improves the processing efficiency, significantly enhances the stability of the product, has outstanding environmental performance, optimizes waste heat utilization and energy consumption, has high resource utilization rate and added value, and has significant social benefits.

The present application relates to a kind of environment-friendly flame-retardant cold-pressing adhesive and its preparation method.The raw materials of the environment-friendly flame-retardant cold-pressing adhesive include 14-21 parts of modified hydrosol, 5-15 parts of magnesium sulfate, 25-35 parts of magnesium chloride, 95-105 parts of magnesium oxide and 0.001-0.01 parts of boric acid by weight.The modified hydrosol is prepared by oxidation crosslinking reaction of propylene hard monomer and hydrosol precursor in the presence of oxidant and crosslinking agent.The adhesive obtained by compounding modified hydrosol with magnesium oxychloride and magnesium oxysulfate inorganic glue has the advantages of high mechanical and bonding strength, good water resistance, and good flame-retardant effect.The modified hydrosol provided by the present application has crosslinking network and abundant hydroxyl and carboxylic acid groups, which gives the adhesive excellent permeability and bonding strength.Magnesium oxychloride inorganic glue enhances the mechanical strength of the adhesive, and magnesium oxysulfate inorganic glue enhances the water resistance of the adhesive.The present application also relates to a plywood containing the above-mentioned environment-friendly flame-retardant cold-pressing adhesive and its preparation method.

The utility model discloses a multifunctional intelligent alarm clock lamp, and mainly relates to the technical field of intelligent household equipment. Comprising a lamp body shell, the lamp body shell is of a triangular prism structure, in three side faces of the lamp body shell, an LED lamp set is arranged on the first side face, a touch display screen and a physical button are arranged on the second side face, and a fixing piece is arranged on the third side face; the two end faces of the lamp body shell are each provided with a hole used for sound transmission, and the two ends in the lamp body shell are each provided with a loudspeaker. A main control single chip microcomputer, a Bluetooth module, a temperature sensor, an audio amplification module and a rechargeable battery are arranged in the lamp body shell; by simulating gradually enhanced natural light and combining sound awakening, comfortable getting-up experience is provided, various intelligent functions such as lighting, music playing and temperature displaying are integrated, multi-angle stable placement is facilitated due to the triangular prism shape, and diversified requirements of users are met.

This invention discloses an infrared camouflage composite yarn, its preparation method, and its application. The preparation process involves first preparing a preform, then dispersing aluminum powder and tin-doped indium oxide powder on a softened film to form an infrared-resistant film. The infrared-resistant film is then coated onto the preform using a layered structure design to prepare a composite preform. Combined with heat treatment, the yarn is then hot-stretched to obtain the improved infrared camouflage composite yarn. The infrared camouflage composite yarn prepared by this invention not only possesses excellent infrared camouflage capability and durability, but the addition of functional particles does not significantly affect the yarn's mechanical properties, such as breaking strength. The functional particles maintain uniform dispersion, improving the uniformity of infrared camouflage performance. This method is suitable for preparing infrared camouflage products, such as military jackets, tents, and backpacks.

The present invention discloses two novel synthetic methods for preparing monothiol-labeled mesylphenyl oxadiazole active esters. These methods use inexpensive commercial raw materials to prepare two kinds of mesylphenyl oxadiazole active esters for thiol labeling of antibodies, polypeptides, hydrogels, etc. through conventional transformations such as condensation and coupling. The preparation method of the present invention has a simple process, easily available raw materials, high product added value, and has good economic benefits and market prospects.

This invention discloses a microsphere-filled lysozyme-chitosan / casein composite antibacterial hydrogel and its preparation method. The technical solution involves using casein as a substrate, with lysozyme adsorbed onto the surface of casein micelles via electrostatic forces, and chitosan coating the outer layer of the lysozyme. The casein micelle solution, lysozyme solution, and chitosan solution are uniformly mixed through physical blending. Electrostatic forces physically cross-link the carboxyl groups on the casein micelle surface with the cations of lysozyme and chitosan amino groups, forming a microsphere-filled lysozyme-chitosan / casein composite hydrogel. This material exhibits excellent sustained-release performance, is environmentally friendly, has good biocompatibility, stable performance, and good antibacterial function.

The invention discloses a targeted compound probiotic preparation for producing SOD (superoxide dismutase) eggs, which is prepared from the following active ingredients in percentage by mass: 5 to 15 percent of bacillus licheniformis, 3 to 10 percent of pseudomonas strain NJ-62, 15 to 30 percent of saccharomyces boulardii, 10 to 20 percent of lactobacillus plantarum, 8 to 15 percent of bacillus subtilis, 10 to 20 percent of candida utilis and 5 to 15 percent of lactobacillus acidophilus. The invention relates to the technical field of healthy breeding of livestock and poultry and production of functional food, in particular to integrated production of'safety 'and'function', specifically, targeted biological detoxification and nutrition metabolism induction technologies are deeply integrated for the first time, and complex probiotic groups remove antibiotics, heavy metals and other endogenous and exogenous pollutants in advance, so that a'clean 'physiological environment is created for laying hens; on the basis, efficient synthesis of SOD is specifically induced, and the problem of potential safety hazards of the functional eggs is fundamentally solved.

This invention provides a method for increasing the content of benzene and naphthalene compounds in coal pyrolysis tar. The method includes: reacting low-rank coal pyrolysis volatiles sequentially through a carbon-based catalyst layer and a molecular sieve catalyst layer at a temperature of 500-800℃ under a protective gas atmosphere; the reaction products are then condensed to obtain tar. This method utilizes a series of carbon-based and molecular sieve catalysts for the catalytic cracking of low-rank coal pyrolysis volatiles, fully leveraging the abundant active sites of the carbon-based catalyst and the high selectivity of the molecular sieve. Through the synergistic effect of the carbon-based and molecular sieve catalysts, a significant increase in the content of benzene and naphthalene compounds in the tar obtained from coal pyrolysis is achieved.

The utility model provides a novel corn dry-process degerming system which comprises a purification and impurity removal system, a fan dust removal system, a secondary degerming and screening system and a multi-stage germ selection system, after raw material corn passes through the purification and impurity removal system, a discharge port of the purification and impurity removal system is communicated with a feed port of the secondary degerming and screening system, and a discharge port of the fan dust removal system is communicated with a discharge port of the multi-stage germ selection system; the fan dust removal system comprises a plurality of groups of fans and bag-type dust removers, outlets of each group of fans are connected with inlets of the corresponding bag-type dust removers, exhaust ports of the bag-type dust removers are communicated with the atmosphere, and inlets of the plurality of groups of fans are respectively connected with air outlets of the purification and impurity removal system, the secondary degerming and screening system and the multi-stage degerming and screening system; the secondary degerming and screening system comprises two groups of degerming machines and a classifying screen, an outlet of the classifying screen is connected with an inlet of the multi-stage germ selecting system, an outlet of the multi-stage germ selecting system is connected with an inlet of the suspension screen, and an outlet of the suspension screen is connected with the germ packaging bin. According to the utility model, the yield of corn germs is greatly increased, and the purity of the corn germs is improved.

The invention discloses a biogas slurry multi-stage thermal cracking system and a waste heat recovery method. The system comprises a feeding pump, a waste heat exchange device, a first-stage thermal cracking device, an interstage reheating device, a second-stage thermal cracking device and a tail gas spraying device which are sequentially connected through pipelines, the method comprises the following steps: pressurizing biogas slurry and then preheating the biogas slurry through a waste heat exchange device; carrying out low-temperature hydrolysis at 110-150 DEG C in a primary thermal cracking device to generate amino acid and reducing sugar and reduce the viscosity; rapidly heating to 160 DEG C to 180 DEG C through an interstage reheating device; the mixture enters a secondary thermal cracking device to be subjected to a high-temperature humification reaction, and a humic acid-like substance is generated; after reaction, high-temperature slurry returns to the waste heat exchange device to release heat, and a finished product is discharged after cooling. Through graded temperature control and countercurrent flow heat exchange, the content of humic acid in the product is increased, the problem of scaling of the heater is solved, the waste heat of the system is recycled to the maximum extent, and the method is suitable for resourceful treatment of the biogas slurry.