330results about How to "No impact on quality" patented technology

The invention provides a bioremediation composition for in situ bioremediation of soil and / or groundwater contaminated with hydrocarbons, comprising an adsorbent capable of adsorbing said hydrocarbons, a mixture of facultative anaerobes capable of metabolizing said hydrocarbon under sulfate-reduction conditions, a sulfate-containing compound that releases sulfate over a period of time, and a nutrient system for promoting growth of said anaerobes, wherein said nutrient system includes a sulfide scavenging agent.

The invention discloses an aquatic product sterilizing pre-treating and cold-preserving method. The method comprises the steps of: firstly, washing an aquatic product by cold water to remove dirt and impurities; secondly, soaking the washed aquatic product in sub-acid electrolysed water or stirring for sterilization; placing the sterilized aquatic product in a foam preservation box and covering the sterilized aquatic product with preservation ice; and finally sealing the box. By using the method, the spoilage caused by microorganism pollution can be effectively restrained and the shelf life of the aquatic product can be prolonged; the preservation ice can be used for lowering the temperature and slowing down a series of biochemical reactions of the aquatic product; the water formed by melted ice during storage and transportation can play a further sterilization role; the sub-acid electrolysed water has a broad spectrum and high-efficient sterilization effect and especially can be reduced to water after reacting with organic matters; compared with the current other sterilizing agents, the sub-acid electrolysed water is safe without residues and is friendly to human bodies and environments; and the sub-acid electrolysed water is moderate in reacting functions and hardly has influences to the quality of meat. The method is not only applicable to preservation of fresh foods such as fish, shrimps and shellfish, but also applicable to the preservation field of meat products.

The invention discloses a step-by-step returning recycling method of LF (Lactoferrin) refining slag in a thermal state. Each recycling application of the method comprises the steps of primary refining step-LF refining step-VD (vacuum degassing) step-pouring step. LF refining slag with a regular amount in a thermal state is stripped after the LF refining step but before the VD step as the first step-by-step recycling LF refining slag in the thermal state which is poured directly into a steel ladle to be refined in an LF furnace in the next recycling process to replace part of pre-melted slag to be recycled and applied to the LF refining step; or the first step-by-step recycling LF refining slag in the thermal state is poured into a desulfuration slag containing ladle, gasified and desulfurated and poured into the steel ladle to be refined in the LF furnace in the next recycling process to replace part of pre-melted slag to be recycled and applied to the LF refining step. The LF refining slag in the thermal state by using the method is high in recycling and application time and low in production cost, and the quality of steel can not be affected by using the method provided by the invention.

The invention relates to computer software, hardware and wireless communication technologies, particularly to a method and device suitable for security protection and security audit of various DCS production control systems. The method and device provide functions of DCS picture monitoring, operating recording, event backtracking, identity authentication, authority control, security data exchange, operation management optimization, can form a production control system information security integrated solution together with conventional information security products such as a firewall and network security audit, and all or part of modules of the method and device are suitable for security protection of industrial production control fields such as power grid and petrochemistry. The method and device is independent of a DCS host, does not install any software plug-ins, and has no influence on DCS production control quality and reliability; and the method and device in the invention innovatively adopts an I / O device tandem connection method to collect and control behavior data of the DCS, realizes security protection and security audit of the DCS, and filling up the blank of DCS security protection and audit products in the domestic market.

The invention discloses a preparation method of natural benzaldehyde. The method comprises the following steps of: getting cinnamyl aldehyde or cinnamon oil as a raw material; adding one or more of multi-phase catalysts of 0.5% to 10% of MnO2, TiO2, Al2O3, SnO2, Fe2O3, MgO, CuO, CeO2, ZrO2, Bi2O3, Y2O3 or active carbon; pouring 0.05 to 0.5g of ozone in a bubbling reactor at -5 to 20 DEG C based on 1g of cinnamyl aldehyde per hour; carrying out an ozonization reaction for 0.5 to 10 hours to obtain an ozonide intermediate; dropping the ozonide intermediate into the thiourea aqueous solution to be reduced while agitating at a constant low temperature, so as to obtain an oil-water mixture; separating the oil from the water to obtain a rough benzaldehyde product; and finally operating a molecular distillation device to obtain the benzaldehyde with relatively high purity. The preparation method has the advantages of simple technology, green reaction, being capable of remaining the natural property of the benzaldehyde, high selectivity, and high yield of the benzaldehyde.

The invention discloses a method, a device and a system for removing aflatoxin, which is used for improving energy utilization ratio of ultraviolet rays to remove AFT, reducing the influence on edible oil flavor and quality in removing process. The technical scheme of the invention is as follows: the ultraviolet light source of a single wavelength is utilized in the method, grease is irradiated by an ultraviolet ray irradiation method to decompose the aflatoxin in the grease; and the wavelength range of the ultraviolet light source of the single wavelength is 355nm-375nm. The invention is applied to food oil processing.

The invention relates to an all-cotton easy-care shirt processing method. The method includes the steps of tailoring, sewing, atomizing and chemical spraying, wherein finishing liquid is sprayed to a shirt to make the liquid content of the shirt range from 70% to 80%, low-temperature drying, wherein the drying temperature ranges from 55 DEG C to 65 DEG C, and the moisture content of the shirt is made to range from 32% to 38%, low-temperature pressing, wherein the pressure ranges from 5 kg / cm<2> to 6 kg / cm<2>, the temperature ranges from 100 DEG C to 110 DEG C, and the time ranges from 25 seconds to 30 seconds, low-temperature roasting, wherein the shirt is processed at 135 DEG C to 140 DEG C for 4 minutes to 5 minutes, cooling, wherein the shirt is ventilated and cooled for 5 hours in a ventilation room with the humidity ranging from 70% to 80% and finished product packaging. According to the all-cotton easy-care shirt processing method, formaldehyde scavenging agents are added into the finishing liquid to be used for conducting hot pressing processing on the shirt, the easy-care and formaldehyde removal functions of the shirt are achieved in one step, the production cost is reduced, and the production efficiency is improved. The all-cotton easy-care shirt processing method is simple in process, high in operability and suitable for mass production, and processed shirts are comfortable in body feeling and high in air permeability and higher in easy-care performance.

The invention discloses a common lophatherum herb extract natural food preservative and a preparation method thereof, belonging to the technical field of food preservatives. The preservative is formed by mixing the following raw materials: a common lophatherum herb extract, streptococcus lactis peptide, natamycin and chitosan, wherein the common lophatherum herb extract is prepared by drying common lophatherum herb extraction solution; and the preparation method comprises the following steps: cleaning and crushing bamboo leaves of common lophatherum herb; soaking in sodium hydroxide solution;regulating the pH value; hydrolyzing; extracting; filtering; concentrating; drying; and mixing for getting the natural food preservative which takes the common lophatherum herb extract as a main raw material. The preservative is completely produced from natural ingredients, has no toxicity or side effects, is further wide in a antimicrobial spectrum and can be widely applied in the preservatives in a variety of food fields, and the invention further provides the preparation method of the preservative.

The invention discloses a natural benzaldehyde preparation method, which comprises the following steps of: taking cinnamaldehyde as raw material; adding 0.5-10% of activated carbon catalyst modified by 0.1-1.0mol / L of hydrochloric acid; at the temperature of below-10-30DEG C, introducing in 0.05-1.0g of ozone at the rate of 1g of cinnamaldehyde per hour; carrying out ozonization reaction for 0.5-10 hours; under the condition of keeping the low temperature, dipping an ozonide intermediate into thiourea aqueous solution for reduction reaction; carrying out centrifugal separation; and finally carrying out molecular distillation at the temperature of 60DEG C and the pressure of 100Pa by a molecular distillation device to obtain the natural benzaldehyde with higher purity. The natural benzaldehyde preparation method disclosed by the invention has the advantages of simple technology, simplicity in operation, high reaction rate, high ozone use ratio, green and environmental-friendly reaction process, efficient catalyst, and is cheap and non-toxic and easy to separate from a product, the natural degree of the benzaldehyde can be kept, the selectivity of the benzaldehyde is good, and the purity and yield of the benzaldehyde are high.

The invention relates to a modified polyurethane asphalt corrosion-resistant coating. In the adopted technical scheme, the corrosion-resistant coating is prepared by mixing a component A and a component B in weight ratio of 1:0.5-1.5, wherein polymethylene polyphenyl isocyanate, isophorone diisocyanate, acrylate, polyether 3031K, polyether 450, dioctyl ester, epoxy resin, phosphate, solvent No.S1000 or industrial xylene are put into a reaction kettle, and react for 0.5 hour at the temperature of 40-42 DEG C, the temperature is raised to 80-82 DEG C, the heat is preserved for 2 hours, the temperature is decreased, and then the component A is prepared; and petroleum asphalt, coal tar asphalt, cyclohexanone, toluene, solvent No.S1000 or industrial xylene and epoxy rein are put into the reaction kettle, the heat is preserved for 2 hours at the temperature of 135-140 DEG C, and the temperature is decreased to room temperature; then, aluminum triphosphate, strontium chromate, mica powder and glass flake are added, grounded, and dispersed, and then the component B is prepared. The coating adopting the invention has the advantages of strong adhesive force, no moisture permeation, strong corrosion resistance, and long service life.

The invention discloses a method for removing benzopyrene from edible oil, and belongs to the technical field of edible oil safety technology. The method of the present invention is to use the composite nanomaterial film coated with TiO2-ZnO to process the edible oil, preferably under ultraviolet radiation, at 0-35 DEG C for 30-180 minutes, so that more than 80% of the benzopyrene in the edible oil can be degraded. The nano-material does not come into direct contact with the edible oil, and can degrade the harmful component benzopyrene, and will not have any other components remaining in the edible oil, which will not affect the quality of the edible oil, nor will it cause damage to the edible oil. It is a new method that is practical and convenient for industrial application, without any loss or production of industrial pollution.

The invention discloses a large arc casting calibrating method, which comprises the following process steps: 1, measuring the size of the opening of a large arc casting (1); 2, cutting the tie bar (11) of the large arc casting (1) to form a gap (12); 3, heating the entire large arc casting (1) to 500 to 550 DEG C in a furnace, keeping temperature for 8 to 8.5 hours and removing the large arc casting (1) out of the furnace; 4, performing local cooling on an inner side area (13) or an outer side area (14); and 5, when the size of the opening of the large arc casting (1) reaches a design size ofthe opening, fully filling the gap (12) in the tie bar (11) with a weldable material, and firmly welding quickly; and performing distressing and annealing treatment. The method has high calibration precision, adopts simple process steps, requires low process equipment conditions and requires low energy consumption. The method is particularly suitable for calibrating semicircle gears of rotary cement kilns.

The invention discloses a preparation method of TCPP (trichloropropylphosphate) flame retardant, which comprises the following steps of: reacting phosphorus oxychloride with propylene oxide to obtain a TCPP crude product under the catalysis of a Lewis acid catalyst, then washing the crude product by alkali and water and distilling;. after phosphorus oxychloride is added into a reaction vessel, dropwise adding NaOH aqueous solution, then adding a catalyst and dropwise adding propylene oxide for reaction. The color number of the finished product of TCPP is reduced to below No.30 at present, to No.10 as the lowest, from the original above No.60 produced without dropwise adding the sodium hydroxide aqueous solution. The method provided by the invention has the advantages of convenience, simplicity and easiness of operation and is good for operation in production, and enables the appearance of the product to be improved significantly without affecting the yield and acid value of TCPP, as well as the quality of TCPP.

The invention discloses an SNCR (selective non-catalytic reduction) denitration device and an SNCR denitration method for a rotary cement kiln and belongs to the technical field of rotary cement kiln pollutant discharge control. The device comprises a reducing agent preparation and storage system, a reducing agent transporting system, a reducing agent spraying system and a control system, wherein the reducing agent preparation and storage system consists of a reducing storage tank and a reducing agent dissolving tank, the reducing agent transporting system consists of a conveying pump and a conveying pipeline, the reducing agent spraying system consists of a booster pump and two stages of spray guns, and the control system consists of two flow meters and two flow meter controllers; and the device further comprises NOx on-line detection instruments respectively positioned in a position with the distance being 10 to 20m from the downstream parts of the two-stage spray guns. The method is realized by using the device, ammonia, urea or alkaline industrial waste liquid is used as a reducing agent, the proportion of the quantity of nitric oxide substances in smoke of a decomposing furnace and the quantity of nitrogen element substances in the reducing agent is determined according to the condition of NOx purified by each stage of spray gun, and the reducing agent is sprayed into the decomposing furnace. The SNCR denitration device and the SNCR denitration method have the advantages that economy and environment protection are realized, the operation is simple, the control is flexible, and the denitration performance is high.

The invention belongs to the field of chemical industry and relates to a hydrolysis method for producing electronic-grade special titanium white by a sulfuric acid process. The technical problem to be solved is that the electronic-grade special titanium white with narrow particle size distribution and low impurity content is prepared by the sulfuric acid process. The method improves the hydrolysis method in the sulfuric acid process, and the improved hydrolysis method comprises the following steps of: A, adding titanium liquid with the concentration of 140 to 190g / L which is preheated to the temperature of between 75 and 95 DEG C into water which is preheated to the temperature of between 80 and 95 DEG C; B, heating the system to boil, and keeping the system boiling; C, when the hydrolysis system becomes steel grey, continuously keeping boiling for 5 to 25 minutes, stopping heating and stirring, and curing; and D, heating the system to boil with stirring, and keeping the system slightly boiling until the hydrolysis is finished. The obtained titanium white has the mean grain size of 800 to 1,200nm, the half-peak width of 70 to 98nm, narrow range of particle size distribution and low impurity content, and can be used as electronic-grade special titanium white.

The invention discloses a treating and recycling process of acid wastewater generated in disperse dye production. The process comprises the steps of collecting acid wastewater generated by a same disperse dye, and separately collecting mother liquor water and washing water; adding at least one of magnesium oxide, magnesium hydroxide and magnesium carbonate to the collected mother liquor water and washing water, and adjusting the pH value to be 7-8; adding solid soda to the wastewater after adjustment until the pH value of the wastewater is 9-12, thereby obtaining first filtrate and first filter residues; adding a mixture of aluminium trichloride and solid soda to the first filtrate, thereby obtaining second filtrate and second filter residues; recycling part of the second filtrate in washing of dye filter cakes, carrying out condensation crystallization on the remaining filtrate, and recycling the condensed water. According to the process, recycling of the wastewater and magnesium is achieved by neutralizing acid water generated in the dye and intermediate production process by utilizing magnesium oxide, magnesium hydroxide or magnesium carbonate and then precipitating magnesium ions with solid soda, therefore, the process meets the requirement for clean production of resources.

The invention discloses a preparation method of natural benzaldehyde by ozone collaborative heterogeneous catalysis of cinnamaldehyde or cinnamon oil. The method is as below: adding 0.5%-10% of aNiO, BaO, MgO, La2O3, SnO2 binary or ternary oxide component catalyst into a raw material cinnamic aldehyde or cinnamon oil, introducing ozone in a bubble reactor under conditions of atmospheric pressure temperature of -10 to 30 DEG C and flow rate of 0.1-5 g / L, and reacting at low temperature for 1-8 h to obtain a benzaldehyde crude product; and finally, using a molecular distillation apparatus to obtain high-purity natural benzaldehyde. The invention has the advantages of simple process, convenient operation, no toxicity or harm of the catalyst, environment-friendliness; the cinnamaldehyde is fully utilized; and the benzaldehyde has good selectivity, high yield, and natural degree intact.

The invention discloses an online desulphurization method for a sintering process, and belongs to the technical field of desulphurization. According to the online desulphurization method for the sintering process, a grate-layer material layer is laid at the bottom of a sintering pallet, and a mixed material for sintering is laid on the grate-layer material layer to form a mixed material layer, wherein a desulphurization agent layer is also laid in the mixed material layer; the distance between the desulphurization agent layer and the bottom of the sintering pallet is 1 / 8 to 1 / 4 of the total height of the mixed material layer; and a desulphurization agent in the desulphurization agent layer is a particulate matter from which ammonium can be decomposed, and is particulate urea with an average particle size of 0.30 to 0.80mm. According to the method, the particulate desulphurization agent is added to a specific position, so that the desulphurization efficiency of the sintering process can be maximally improved, each technical index of sintered ore can be ensured, and influence on the quality of the sintered ore is substantially avoided.

The invention relates to a method for environmentally and efficiently preparing polycarbosilane, comprises the following steps: enabling a reactant dimethyl dichlorosilane to react with metallic sodium in an organic solvent to prepare polysilane, removing the solvent, reacting with residual metallic sodium by using alcohol, directly feeding into a cracking kettle to prepare low-molecular weight liquid state cyclic polysilane, and finally preparing polycarbosilane from the liquid state cyclic polysilane. The method has the advantages that the processes of washing and drying the polysilane for a plurality of times, which are long in time-consuming and capable of producing industrial wastewater, are avoided in an existing process route of producing the polycarbosilane; meanwhile, the solvent and the alcohol adsorbed in the polysilane can be subjected to secondary recycling in the process of preparing the liquid state polysilane. The pilot scale test data shows that compared with the prior art, the method has the advantages that the production period is saved by 30-50%, the solvent recycling rate is increased by 10-20%, the industrial wastewater containing a benzene organic solvent cannot be produced, the working environment is purified, and the reaction residue is fluffy solid residue, and can be easily cleaned from a reaction still.

The invention discloses a traditional Chinese medicine composition used for preventing and treating cow recessive mastitis and a preparation method thereof, the traditional Chinese medicine composition comprises the following bulk drugs by mass portions: 10-20 parts of dandelion, 5-15 parts of honeysuckle flower, 10-20 parts of Yedo violet, 5-15 parts of Chinese angelica and 5-15 parts of laminaria japonica. The traditional Chinese medicine composition of the present invention is an external transdermal preparation, the administration is convenient, and no mechanical damage to the cows is generated. The composition is a pure Chinese medicine preparation which has the advantages of no residue, no pollution, environmental protection and safety; the traditional Chinese medicine composition of the present invention has substantial curative effect, the recovery rate of cow recessive mastitis is 88.9%, and the effective rate is 97.2%, the traditional Chinese medicine composition has no influence to the quality of cow milk and is capable of increasing the milk yield, the invention has the merits of simple production technology and convenient usage.

The invention discloses a method for utilizing fast-growing willows to culture auricularia auricula, and belongs to the technical field of edible fungus production. The method comprises the steps of 1, activation of auricularia auricula mother seeds, including preparation of mother seed culture mediums, separation, sterilization, inoculation and culture; 2, preparation of auricularia auricula original seeds, including preparation of original seed culture mediums, sterilization, inoculation and culture; 3, preparation of auricularia auricula culture seeds, including material preparation, material mixing, bagging, sterilization, inoculation, culture, after-ripening, cutting and germination acceleration; 4, planting management of auricularia auricula, including growing management, harvesting and air drying. According to the method, the shortage problem of weedtree sawdust resources for auricularia auricula culture is solved, and compared with auricularia auricula cultured by weedtree sawdust, the yield of auricularia auricula cultured by the fast-growing willows is slightly increased, but the quality of auricularia auricula has no obvious difference. Through the adoption of the method, the fast-growing willow sawdust resourcesare reasonably and effectively utilized, and the resource waste is avoided.

The invention discloses a system and a method for treating a used electronic product. The system comprises a pretreatment unit, a pyrolysis unit, a separation unit, a mixing unit, an oil-gas separation and purification unit and a calcium carbide production unit. The method for treating the used electronic product by adopting the system comprises the following steps: (1) pretreatment: the used electronic product is disassembled and crushed; (2) pyrolysis: a pretreatment product is subjected to pyrolysis, high-temperature oil gas and a carbon-containing solid substance are obtained, the high-temperature oil gas is collected, and the carbon-containing solid substance is discharged; (3) separation: the carbon-containing solid substance is subjected to fine crushing and separation, and pyrolytic carbon is obtained; (4) mixing: the pyrolytic carbon is mixed with a calcium-based raw material; (5) oil-gas separation and purification: the high-temperature oil gas is subjected to separation, noncondensable gas is obtained and treated, and pyrolysis gas is obtained; (6) calcium carbide production: a mixed product is subjected to a reaction in a calcium carbide furnace, and calcium carbide is obtained. According to the system and the method, recovery of the used electronic product and production of calcium carbide are coupled, recycling of the used electronic product is realized, and the production cost of calcium carbide is reduced.

The invention relates to a traditional Chinese medicine for increasing the feed intake of chicken and a preparation method thereof. The traditional Chinese medicine is prepared from the following raw pharmaceutical materials in parts by mass: 90-100 parts of astragalus roots, 70-75 parts of codonopsis pilosula, 55-60 parts of white atractylodes rhizome, 51-55 parts of dried tangerine peel, 34-38 parts of atractylodes rhizome, 34-38 parts of magnolia barks, 68-73 parts of fried hawthorn, 68-73 parts of fried malt, 20-25 parts of prepared liquorice roots and 68-70 parts of fried medicated leaven. The preparation method of the traditional Chinese medicine comprises the steps of mixing the raw pharmaceutical materials according to the ratio, slicing, and decocting for drinking. Compared with antibiotic feed additives, the traditional Chinese medicine has the advantages that no residue is caused, the raw materials are easily obtained, the cost is low, the use is convenient, and no influence on the quality of chicken of table poultry is caused; moreover, confirmed by tests, the traditional Chinese medicine is capable of improving the weight gain of the table poultry, increasing the growth rate of the table poultry, increasing the feed conversion efficiency, increasing the feed / chicken ratio, reducing the feed cost, improving the immunity of the organism, enhancing the disease resistance of the table poultry and increasing the economic benefit of culture.

The invention provides styrene-maleic anhydride alkylphenol polyoxyethylene ether copolymer which has a structure shown as a formula I. The copolymer disclosed by the invention has better compatibility with high-colloid asphalt, can be used as a high-colloid asphaltene heavy oil viscosity reducer, has effects of dispersing asphaltene and enhancing colloid stable asphaltene, can effectively reduce heavy oil viscosity and has higher viscosity reduction rate. In an application process, the copolymer can be directly added into heavy oil, has convenience in application and low cost and further has no effect on oil quality. Embodiment results show that the styrene-maleic anhydride alkylphenol polyoxyethylene ether copolymer disclosed by the invention can be utilized as the viscosity reducer to be applied into the heavy oil; when an adding amount is 0.4% of the mass of the heavy oil, the viscosity reduction rate at 50 DEG C can reach 76% or more.

The invention relates to a symbiotic cultivation method of a tomato grafting with a purple spring potato. The method comprises the steps that a tomato seed is sowed, and a purple spring potato is planted; when the height of a tomato grafted seeding ranges from 10 cm to 15 cm or the grafted seeding has six or eight leaves at the last ten-day of February, grafting is conducted; growing point and one cotyledon of the purple potato are cut by a blade, then a peeled bamboo stick is aslant inserted downward about 1 cm from a main vein with a stock and the cotyledon being peeled off in the direction of a cotyledon on the other side, a wedge-shaped plane with the length of the oblique plane about 1 cm is peeled at the position below the a tomato cotyledon 1 cm to 1.5 cm by the blade, and a peeled scion is inserted into a hole. When a graft union is healed, a full and integrated symbiotic plant of the purple potato and the tomato is bred, and the tomato above the ground and the potato below the ground can be harvested at the same time, high yield and funny ornamental value are integrated in one, and the use ratio and disease-resistant ability of the land are improved.

The invention discloses a preparation method of benzaldehyde from cinnamaldehyde by continuous catalytic ozone oxidation, which comprises the following steps: by using cinnamaldehyde or cassia oil as the raw material, adding a mixed solution of 50g cinnamaldehyde and anhydrous ethanol into a continuous ozonization reactor, adding 0.5-5.0% of one or more of MnO2, ZnO, Fe2O3 and CaO as a catalyst, introducing 0.05-0.85g of ozone to every gram of cinnamaldehyde per hour at -5-20 DEG C to carry out ozonization reaction for 10 minutes, continuously introducing the cinnamaldehyde-anhydrous ethanol mixed solution at the rate of 50-100g.h<-1>.gcat<-1> to continuously react to obtain a liquid-phase product, and distilling the liquid-phase product in a molecular distillation device at certain temperature under certain pressure to obtain the higher-purity benzaldehyde. The method has the advantages of simple technique, green reaction process, favorable selectivity and high benzaldehyde yield, can maintain the nature of the benzaldehyde, and can implement continuous production of natural benzaldehyde.

The invention provides a catalyst for preparing enol through partial hydrogenation of alkynol, a preparation method of the catalyst and a method for preparing the enol by using the catalyst. A metal salt or a metal carbonyl compound substance is added into a catalyst system, and the catalyst system is moderately poisoned in a synthesis gas atmosphere to prepare the hydrogenation catalyst. The catalyst is poisoned and then used for partial hydrogenation of alkynol to prepare enol. The catalyst has the advantages of mild reaction conditions, high product selectivity and the like.

The invention discloses a drying method for a 3D printed sand mold. A 3D printer is used for printing the sand mold, then the sand mold is put into microwave drying equipment to be dried, and then the sand mold is verified. Therefore the overall efficiency of the 3D printing technology applied in the field of casting of sand molds is improved, and it is guaranteed that the quality of the sand molds is not affected by the drying process.

The invention discloses a method for anhydrously surviving freshwater fish through repeated dormancy, at least comprising two times of dormancy. The times of the repeated dormancy are selected according to the practical needs of transportation distance and time. The method comprises the following steps of: temporary culture, first dormancy, recovery convalesce, second dormancy and convalesce. During the transportation of marine products, repeated dormancy survival is carried out on the same batch of live fishes to prolong the anhydrous survival time and be beneficial to the living body transportation of the live fishes.