83results about How to "Do not change nature" patented technology

The invention belongs to the field of detergent compositions, and provides a method for preparing a pesticide-removing fruit and vegetable cleaning agent based on shell powder. The pesticide-removing fruit and vegetable cleaning agent is prepared from natural shell powder as a main raw material, and a natural adjuvant by the steps of preparation of micro / nano shell powder and addition of the natural adjuvant. The pesticide-removing fruit and vegetable cleaning agent is capable of effectively adsorbing and removing harmful residue matters such as pesticides and chemical fertilizers in the fruits and vegetables, not changing the properties of foods, and prolonging the quality guarantee period, and is safe, non-toxic, degradable, and suitable for cleaning of various fruits and vegetables; and the fruits and vegetables can be directly eaten after being cleaned. The pesticide-removing fruit and vegetable cleaning agent has good adsorptive property, bactericidal performance and the like, can play a good adsorption role in pesticide residues on the surfaces of the fruits and vegetables, is free of harm to a human body and the environment, and is capable of overcoming the defects of an existing cleaning agent in the aspects of non-degradation and chemical synthetic substance residue on the surfaces of the fruits and vegetables.

The invention belongs to the technical field of biological medicine, and particularly relates to application of diindolymethane and the derivant thereof in rheumatoid arthritis and preparation of novel aqueous solution preparation of diindolymethane and the derivant thereof. The diindolymethane and the derivant thereof can effectively improve the level of interferon - Gamma in vitro and in vivo and can regulate the immunity of the organism, thereby stopping the happening and development of diseases and reducing the injury caused by the diseases. In addition, the intermediary mainly involved in the water solution preparation of the product is cyclodextrin. The water solution preparation of the product can effectively improve the water solubility, and is convenient for use. The application of the water solution preparation of the product is not limited only within the application on treatment of rheumatoid arthritis, but also includes the application of diindolymethane and the derivant thereof in treatment of other diseases, such as tumor and androgen and estrogen related diseases.

The invention discloses a method for extracting gold and / or silver from sulfuric acid slag. The method comprises the following steps: performing multi-stage countercurrent leaching on sulfuric acid slag containing gold and silver by using an acidic thiourea solution; adsorbing a leachate by using an ester-based thiourea resin column; and after elution of a dilute acid, performing replacement and reduction by using iron to obtain noble mud containing gold and silver. The adsorption solution and the replacement solution can respectively return to a former process to be used as a leaching agent and an eluting agent; and in the operating process, wastewater and waste residues are not discharged, so that the method has remarkable environmental and economic benefits.

The invention belongs to the technical field of quality and safety of agricultural products and in particular relates to a model forecasting method for forecasting a rice grain heavy metal accumulation amount based on a soil heavy metal DTPA (diethylenetriamine pentaacetic acid) extractable state content. The key points comprise the following steps: extracting and measuring the heavy metal extractable state content of the soil by using 0.005MDTPA, and sampling and measuring the heavy metal content in the rice produced in the corresponding soil simultaneously, wherein the heavy metal types mainly aim at As, Cd, Cr, Cu, Pb and Ni with great risk of polluting the domestic rice at present; then analyzing data and establishing a forecasting model, forecasting the rick through the forecasting model, comparing the forecasted data with a standard specified by WHO (World Health Organization) or a pollution-free rice standard specified by the nation, and forecasting the heavy metal pollution rick of the rice planted in the region. The invention aims at providing a rich grain heavy metal pollution rick forecasting method which has an environmental-friendly effect, is convenient to operate and high in reliability, so that a basis is provided for selecting production bases of safe and high-quality rice and taking a corresponding complete set of techniques in production in advance.

The invention discloses a method and device for configuring the boundary frequency band of an efficient filter rapidly. The method for configuring the boundary frequency band of the efficient filter rapidly comprises the steps that relevant pass band parameters of the filter and the translation parameters are obtained according to the pass band cut-off frequency of the filter and the order of the filter, and the filter coefficient with the length being 2N-1 existing before compensation is obtained according to the relevant pass band parameters of the filter and the translation parameters; a filter coefficient is obtained according to the filter coefficient existing before compensation, the Kaiser window parameter and a compensating filter coefficient analytic expression; the filter coefficient existing before compensation and a compensating filter coefficient are added, so that the final filter coefficient is obtained. The device for configuring the boundary frequency band of the efficient filter rapidly comprises an external RAM, a DSP, an output driver and a display circuit. According to the method and device for configuring the boundary frequency band of the efficient filter rapidly, parameters required for compensating the filter are calculated according to the filter coefficient existing before compensation and a transmission curve and are fed back to be stored in the external RAM, and all the parameters required for designing the filter are input into the DSP through the external RAM, so that the required filter coefficient and the transmission curve are obtained and are displayed through the output driver and the display circuit.

The invention relates to a preparation method of an antisepsis and antimildew agent. The preparation method is that: polysaccharid water solubility adhesive agent is dissolved in an acid solution and then nanometer titanium dioxide is added into the acid solution, each one gram of the adhesive agent is added with 0.01 to 10 grams of the nanometer titanium dioxide, at last the mixed agent is added with an organic cross-linking agent to make the antisepsis anti mildew agent, each one gram of the adhesive agent is added with 0.1 to 100 ml of the organic cross-linking agent, during the preparing process of the invention, the antisepsis and antimildew agent can be added with cellulosic latex, metallic ions and high molecule sterilization auxiliary agent etc., which results in synergistic effects of a plurality of bactericidal agents, in addition, dried and formed into film, the invention which is coated on the surfaces of articles has antisepsis and mildew proof effects. Within two hours after using the invention, the sterilizing rate is more than 90 percent, the sterilizing rate is nearly 100 percent within four hours, and the sterilizing rate can be maintained more than 90 percent within twenty-four hours, resulting from time efficiency of the invention.

The invention discloses a fire coal dust suppressant and a preparation method thereof. The fire coal dust suppressant is prepared from isophorone diisocyanate or hexamethylene diisocyanate, polyether glycol of which the molecular weight is 1,000, polyether glycol of which the molecular weight is 2,000, diethylene glycol, epoxy resin E-51 or epoxy resin E-40 or epoxy resin E-20, 2,2-dimethylolpropionic acid, dibutyltin dilaurate T-12 or dibutyltin dilaurate T-9, triethylamine or quadrol and deionized water in a weight ratio through a reaction. The fire coal dust suppressant has the advantages of low production cost, environmental-friendly products, easy spraying, simple construction and good film-forming effect of fire coal surfaces.

The invention discloses microwave infrared coupling low-temperature drying equipment for sludge. The microwave infrared coupling low-temperature drying equipment for the sludge comprises a screw conveyer, a sludge extrusion molding machine, a sludge preheater and a microwave infrared coupling drying device, wherein the screw conveyer, the sludge extrusion molding machine, the sludge preheater and the microwave infrared coupling drying device are sequentially connected through a pipeline; the microwave infrared coupling drying device comprises a microwave infrared coupling dryer, a first induced draft fan, a first heat exchanger, a second heat exchanger, a heat pump, a water circulating pump and an electric heater; the microwave infrared coupling dryer, the first induced draft fan, the first heat exchanger, the second heat exchanger, the heat pump and the electric heater are sequentially connected through a ventilating duct; and the electric heater is also connected to the microwave infrared coupling dryer through the ventilating duct. By the system, the sludge is dried in cycle by heat energy; the operation cost is reduced; meanwhile, secondary pollution is reduced; the risk of explosion is reduced; and the system is provided with a tail gas collecting and purifying system, a flammable and explosive gas detection probe and an alarm device.

The invention discloses a method and a system for treating petroleum refining wastewater electro-desalting black liquor, and belongs to the technical field of chemical equipment. According to the technical scheme, the method comprises the following steps: delivering the electro-desalting black liquor to a homogenizing buffer tank for sedimentation treatment, collecting floating oil, pumping oily wastewater into a filter by using a water pump, and removing suspended matters until every liter of oily wastewater contains less than or equal to 5 micrograms of suspended matters; delivering the filtered wastewater to an oil-water separator, separating oil to a collection tank in the oil-water separator, and externally draining or delivering the effluent of the separator to other facilities, wherein every liter of effluent of the oil-water separator contains less than or equal to 10 micrograms of oil. The method is short in treatment time, high in treatment speed, free of secondary pollution, safe and effective; the system is simple in structure, easy to operate and convenient to maintain, can safely and reliably operate, and has good treatment effects, and secondary pollution can be eliminated.

The invention belongs to the technical field of the biological medicine, and particularly relates to a cation-modified konjac glucomannan gellan gum microsphere as well as a preparation method and an application. The cation-modified konjac glucomannan gellan gum microsphere is prepared from a nucleic acid drug and a drug delivery carrier, wherein the nucleic acid drug is ribonucleic acid or desoxyribonucleic acid, and a drug delivery system comprises the components as follows: 20-30 parts of cKGM (cation konjac glucomannan), 1-9 parts of gellan gum and 0.01-6 parts of the nucleic acid drug. According to the microsphere, the requirement for colon-specific drug delivery of the oral microsphere is met, and the microsphere is simple in preparation technology and easy to industrialize and has very broad development and application prospects.

The invention discloses a preparation method and application of an RGD@BBN double-targeted MR (magnetic resonance) / optical dual-mode molecular probe, wherein the RGD@BBN double-targeted MR / optical dual-mode molecular probe is prepared by the following steps: coating water-soluble superparamagnetic iron oxide ( SPIO) particles in hydrophilic core of lipidosome and coating oil-soluble QDs particles in hydrophobic lipid bilayer of the lipidosome by taking lipidosome as a carrier, and linking a double-targeted RGD@BBN ligand by virtue of a post-interpolation method. The RGD@BBN contained in the dual-mode molecular probe disclosed by the invention is interpolated and immobilized on the surface of the lipid bilayer by virtue of self-assembly, and the preparation method is mild in condition and is efficient and practical. According to the invention, a relatively independent space is coated by two different image contrast agents without changing the properties of the image contrast agents; and the prepared double-target dual-mode molecular probe, which simultaneously has RGD and BBN targeting functions, has targeting functions on RGD or (and) BBN receptor-positive tumors.

The invention discloses a sample treatment device for testing sewage pollutants. The sample treatment device comprises a base, wherein supports are respectively and fixedly connected to two sides of the top of the base; a fixed plate is fixedly connected to the inner side upper ends of the outer walls of the supports; a first box body is fixedly connected to the bottom of the fixed plate; a firstmotor is fixedly connected to the bottom of the inner wall of the first box body through a motor base; a rotating shaft is rotationally connected to one side of the first motor through an output shaft; a first bevel gear is fixedly connected to one end, away from the first motor, of the rotating shaft; a mounting shaft is rotationally connected to the top of the inner wall of the first box body; asecond bevel gear is fixedly connected to the upper end of the outer wall of the mounting shaft and is meshed with the first bevel gear; one end, away from the first box body, of the mounting shaft,penetrates through the first box body and extends to the outer part of the first box body. The invention relates to the technical field of soil detection; the problems that manual grinding is needed before detection of a detected sample so as to waste labor force, and low grinding efficiency and poor grinding effect are produced are solved.

The invention relates to a method for preparing water-insoluble collagen by using thoracic aortas of pigs as raw materials through process steps such as degreasing, impurity removal, enzyme hydrolysis, salt induced precipitation and dialysis. The process steps of the method are simple, safe and easy to operate, the cost is low and the purity of the obtained product is high. Compared with water-soluble collagen, the in-vivo degradation speed of the water-insoluble collagen obtained by the invention is reduced, the blood coagulation speed is faster and the water-insoluble collagen can be used for stopping wound bleeding or preparing other medical biological materials.

The invention discloses a steel rolling alkali wash water filtering and recycling system which adopts oil removing, coarse filtering, fine filtering, concentrating and dewatering and deslagging and is characterized in that a sloping panel oil separating groove of which the upper part is provided with a chain type oil scraping device and the lower part is provided with a slag settling taper hopper is adopted in oil removing; a self-cleaning filter is adopted in coarse filtering for intercepting large-particle impurities to prolong the backwashing period of a microfilter unit; a micropore filtering device is used in fine filtering and is internally provided with a compound micropore filter core; settled slag in the sloping panel oil separating groove, drained sludge in the self-cleaning filter and drained sludge in the microfilter unit are integrally collected to a waste alkali water storage tank for carrying out secondary concentration; and the concentrated waste slag in the waste alkali water storage tank is dewatered by a plate frame filter press or centrifugal dehydrator, and then conveyed outside by a slag car. The steel rolling alkali wash water filtering and recycling system has the advantages of good oil removing effect, high filtering precision, clear filtered liquid, no change of properties, concentration and other physicochemical properties of alkali wash water, full recycling of liquid, dual recycling of solid and liquid, no environmental pollution and energy saving.

The invention discloses a method for performing surface treatment on a material for boosting cell growth and resisting biological pollution, which comprises the following steps: firstly, performing activating treatment on a material surface, and performing surface self-assembly reaction; and then fixing amphoteric-ion molecules and polyethylene glycol molecules with the characteristics of resisting biological pollution and extracellular matrix proteins or albumen polypeptides for boosting cell growth on the material surface in turn, thereby obtaining a material with the characteristics of boosting cell growth and resisting biological pollution. By performing surface treatment on the material according to the method provided by the invention, the material surface is simultaneously endowed with the capabilities of resisting biological pollution and boosting cell growth. The method is applied to the fields of biological materials, tissue engineering, nanometer material research, and the like.

The invention provides a preparation method of chitin functional hydrocolloid medical dressing, comprising the following four steps of step 1: heating and dissolving 40 to 100 weight parts of medical polyisobutene hot-melt adhesives in a mixer under the temperature of 130 to 150 DEG C so as to form a component A; step 2: under the room temperature, mixing 20 to 40 weight parts of sodium carboxymethylcellulose, 0.5 to 5 weight parts of pectins and 5 to 30 weight parts of chitin or chitin deacetylation derivatives or chitosan to form a solid powder body, wherein the particle size of the powder body is 150 to 300 meshes; and the powder body is a component B; step 3: slowly adding the mixed component B into the component A; carrying out vacuum constant-temperature mixing for 60 to 90 minutes under the temperature of 120 to 130 DEG C; subsequently carrying out injection molding on a piece of release paper or a PU membrane; step 4: carrying out ageing treatment on formed hydrocolloid, subsequently forming shapes suitable for various wounds by extruding; and subsequently carrying out die-cutting and packaging to form a product, wherein the ageing treatment temperature is 30 to 65 DEG C; and the ageing treatment time is 72 hours. The dressing prepared by the preparation method is suitable for wounds with various shapes and is particularly suitable for the wounds at difficultly fixed parts.

The invention discloses a method for producing aluminum oxide by a sintering process and relates to an improvement of a clinker sintering and concentrate desilicication process in a process of producing aluminum oxide by the sintering process. The method is characterized by comprising the following steps: (1) mixing carbide slag with bauxite, anthracite and sodium carbonate, and grinding into raw slurry; (2) mixing the carbide slag with aluminum hydroxide washing liquor or hot water to prepare an carbide slag emulsion, mixing the carbide slag emulsion with primary desilicication liquid for reaction, carrying out solid-liquid settling separation on the slurry after reaction, and filtering to obtain concentrate and silicon slag, wherein the concentrate is used for producing aluminum oxide and the silicon slag is conveyed back to a rotary kiln for mixing and sintering. According to the method, effective calcium oxide in the carbide slag is utilized and the problems of the pollution of the carbide slag on an environment and high energy consumption, high cost and the like of lime for producing aluminum oxide by the sintering process are effectively solved according to the characteristics that the carbide slag is low in impurity content, low in water content and convenient to transport.

The invention discloses a sludge freeze-thawing cycle conditioning and deep dewatering method, relates to the technical field of sludge treatment, and aims to solve the problems that a sludge treatment method on the market is low in dewatering performance and low in sludge dewatering amount, the number of treatment devices is large, the treatment devices are dispersive, the process is complex, anduse cost is high. The method comprises the following steps: (1) taking residual sludge of a sludge bin of a sewage treatment plant, wherein the moisture content of the sludge is 70-80%; (2) carryingout quick freeze-thawing treatment: concretely putting the sludge into a W-shaped material frame, soaking the material frame in a refrigerating fluid through an electric hoist, completely freezing thematerial frame, then conveying the material frame to a thawing tank through the electric hoist for demolding treatment, and carrying out discharging after demolding is completed, wherein the freezingtemperature ranges from -25 DEG C to -35 DEG C, the freezing time is 1-1.5 hours, the unfreezing temperature is about 35-45 DEG C, and the thawing time is 15-30 minutes; and (3) after the sludge is thawed, conveying the sludge to a deep dewatering integrated device. Firstly, the pressure in a filter pressing stage is 0.8-1.6 MPa, the filter pressing time is 15 min, the squeezing pressure in a squeezing and dewatering stage is 1.8 MPa, the squeezing time is 10 min, and a mud cake with a water content of about 40% is obtained after deep dewatering is carried out through a plate-and-frame filterpress.

The invention belongs to the field of medicine, and relates to an application of deuterium-depleted water (DDW) in reversing tumor multidrug resistance and an application as an antineoplastic drug sensitizer. The deuterium-depleted water, which has an effect of reversing the multidrug resistance of tumor cells as a natural product, can be used as a tumor multidrug-resistance reversal agent; and meanwhile, the deuterium-depleted water, which has an effect of enhancing the sensitivity of tumor multidrug-resistance cells to an antineoplastic drug, can be used as the antineoplastic drug sensitizer. The deuterium-depleted water provided by the invention, as ab adjuvant therapy agent for tumor therapy, can be independently used or used in a mode of combining with one or more antineoplastic drugs selectively. The invention also relates to independent use of the deuterium-depleted water or the combined use of the deuterium-depleted water with one or more antineoplastic drugs in daily tumor therapy, wherein the deuterium content in the deuterium-depleted water is 0.01-100ppm.

The invention provides a continuous hydraulic classification and separation device of particulate matters in a water body and a separation method thereof. The continuous hydraulic classification and separation device comprises hydraulic separators connected in sequence and with multistage cross section areas being enlarged in sequence; each hydraulic separator comprises a drum body; an overflowinggroove is arranged at the upper part of the drum body, a depositing hopper is arranged at the bottom part of the drum body, the drum body is connected with a water feeding pipe, the overflowing groove is connected with a water discharging pipe, and the depositing hopper is connected with a discharging pipe; a flow guiding drum is arranged in the drum body, a reflecting plate is arranged at the bottom part of the flow guiding drum, the water feeding pipe extends into the flow guiding drum, and a water outlet is also arranged at the bottom part of the flow guiding drum. The invention also provides a method for separating the particulate matters in the water body on the device. The continuous hydraulic classification and separation device of the particulate matters in the water body and theseparation method provided by the invention have the beneficial effects that the hydraulic separators with unique structural designs are adopted, the rising flow speed of the water body is lower thanthe sinking speed of the particulate matters, and the particulate matters are deposited in the deposition hopper; conversely, when the rising flow speed of the water body is higher than the sinking speed, the particulate matters enter the next-stage hydraulic separator; the structure is simple, the classification effect is good, the collection is convenient and the separation efficiency is high.

A process for increasing the output rate of the general flavone of Japanese St. John's-wort herb includes such steps as dissolving in NH3H2O solution, diluting the extracted concentrated liquid, and regulating the pH value of solution to become near neutral or slightly alkaline for increasing the solubility of flavone in water. Its output rate can reach 50-80%.

The invention discloses an environment-friendly high-strength binder. The environment-friendly high-strength binder is prepared from 26-40 parts of phthalic anhydride, 9-13 parts of furfuryl alcohol, 12-15 parts of triethylene glycol, 16-20 parts of glutaric acid, 9-11 parts of butantriol, 6-9 parts of zinc oxide, 4-7 parts of magnesium oxide, 17-29 parts of neoprene, 72-90 parts of elastic rubber, 4-5 parts of softening oil, 16-19 parts of dimethyl carbonate, 2-4 parts of benzoyl peroxide, 5-9 parts of acetic ether, 2-5 parts of octaphenyl polyoxyethyiene, 12-20 parts of flour, 2-5 parts of fire retardant, 45-60 parts of waterborne polyurethane, 43-65 parts of tert butyl phenolic resin, 86-90 parts of nitrile rubber, 4-13 parts of magnesium oxide, 3-11 parts of kieselguhr, 70-90 parts of methyl isobutyl ketone, 3-8 parts of stearic acid, 2-5 parts of curing agent, 1-6 parts of catalyst, 2-5 parts of propylgallate, 200-300 parts of deionized water and 100-130 parts of acrylate monomer. The formula of the environment-friendly high-strength binder is reasonable, the preparing method is simple, binding property is high, binding strength with rubber products is high, and service life is long.

The invention discloses a solid-liquid separation method for superfine powder slurry and relates to the technical field of solid-liquid separation. The solid-liquid separation method comprises the following steps of: freezing the powder slurry at the temperature of between 50 DEG C below zero and 0 DEG C until the powder slurry is completely frozen and in a solid state; warming and melting the frozen slurry, standing and settling; and directly pouring out supernatant or discharging the supernatant through a valve on a container, namely solid-liquid separation is realized. The method has the advantages that: physical aggregates are formed in the process of freezing powder particles, the property and surface appearance of the powder are not changed, and particle size distribution of the powder can be kept invariable after sedimentation; the drying cost of powder materials can be greatly reduced due to solid-liquid separation; and the powder materials prepared by the separation method have higher dispersibility.

The invention belongs to the technical field of biological medicines, and particularly relates to a cKGM (cation-modified konjac glucomannan) and nucleic acid medicine nanometer preparation, a preparation method and an application. The preparation consists of nucleic acid and cKGM. The specific preparation method comprises steps as follows: the ethylenediamine-modified KGM is prepared into the cKGM, and then the cKGM is compounded with a nucleic acid medicine to form nanoparticles. The nucleic acid in the preparation is ribonucleic acid or deoxyribonucleic acid, the preparation has the characteristic of targeting macrophages and can be prepared into medicines for treating inflammations caused by the macrophages.

The invention discloses a filter boundary frequency band control method and device based on a genetic algorithm. The method comprises the steps that the filter frequency sampling vector length, boundary frequency band parameters and horizontal moving amount parameters are obtained according to the passband cut-off frequency of a filter and the bandwidth of a transitional band of the filter; the coefficient of a filter to be compensated with the length of 2N-1 is obtained accordingly; the optimist Caesar parameter obtained through operation of the genetic algorithm is substituted into a coefficient analytic expression of a compensation filter to obtain the coefficient of the compensation filter after the optimist Caesar convolution window is optimized; the finally needed filter coefficient is obtained by adding the coefficient of the filter to be compensated to the coefficient of the compensation filter. The device comprises an outer RAM, a DSP and an output driving and displaying circuit. Firstly, the needed passband cut-off frequency of the filter and the bandwidth of the transitional band of the filter are stored into the outer RAM, and then are input into the DSP in real time, and the needed filter coefficient and the transmission curve are obtained finally through processing of internal core algorithms and the like of the DSP and are displayed in real time through the output driver and display circuit.

The invention relates to a combined solar photovoltaic support device for farmland and wasteland. The device is structurally characterized in that a solar battery assembly is connected with an upper bearing beam and a lower bearing beam, the upper bearing beam and the lower bearing beam are connected with a square tube triangular support through connection pieces, the square tube triangular support is connected with a steel tube stand column which is connected with a reinforced concrete pier, and the reinforced concrete pier is connected with the ground and buried underground. The combined solar photovoltaic support device can solve the problem that building of distributed solar photovoltaic power stations in plateau mountainous areas in the south of China and the dry and hot valley area of the Jinsha River in China is limited by farmland and forest land indexes, and the land utilization value can be maximized. The combined solar photovoltaic support device can further serve as a frame foundation for greenhouse vegetables, facility horticulture, facility agriculture, factory farming and solar greenhouses.

The invention provides a plasma cavity and precleaning equipment for physical vapor deposition. The plasma cavity comprises a cavity body, a plasma generator and a base arranged in the cavity body for supporting machined workpieces, and further comprises a plasma adjusting device arranged above the base; when a process is performed, a sheath layer is formed on the surface of the plasma adjusting device; and part of ions in an area with high ion density in plasmas are neutralized as neutral particles by electrons in the sheath layer, so that the density of the ions reaching in the plasmas on the surface of the machined workpieces is uniform. The precleaning equipment for physical vapor deposition comprises the plasma cavity. The density of the plasmas in the plasma cavity and the precleaning equipment is uniformly distributed, so that the machining quality of the machined workpieces is high.

The invention discloses a processing method of collagen. According to the method, a collagen raw material is subjected to natural hydrolysis treatment, additive-free spray drying is performed, and amino acid powder which is high in amino acid content, good to absorb and natural in taste is obtained. According to the method, the hydrolysis rate of the collagen is high, the amino acid content is higher than or equal to 85%, the proportion of multiple amino acids is reasonable, the collagen is natural in taste, facilitates human body absorption and is suitable for large-scale industrial production, and the market development and recycling of the collagen can be promoted.

The invention discloses a preparation method of an aquatic product fresh-keeping agent based on shell powder. The preparation method comprises the following steps of preparing micro nanometer shell powder; sequentially performing desalting and degreasing treatment, drying treatment, coarse grinding treatment, calcining and expanding treatment, cold treatment and micro nanometer crushing treatment on shells so as to obtain the micro nanometer shell powder; adding a natural thickener: adding water and the natural thickener to the micro nanometer shell powder, and performing mixing so as to obtain the aquatic product fresh-keeping agent. The aquatic product fresh-keeping agent prepared by the method disclosed by the invention can be rapidly adhered to the surfaces of the aquatic products, has favorable sterilizing and fresh-keeping properties, is natural and harmless, and is a promising purely natural aquatic product fresh-keeping agent.

The invention relates to a method for drying and dewatering coal at low temperature, which comprises the following steps: (1) drying coal with a drier provided with an air inlet and an air outlet, adding the coal to the drier; and blasting dry air through the air inlet of the drier to dry the coal, wherein the temperature of the air through the air inlet of the drier is less than or equal to 300 DEG C, the ratio of the volume flow of the dry air to the volume flow of the coal is (3-20):1, and the volume content of the moisture in the dry air is less than or equal to 10% or the relative humidity is below 40%; and (2) repeating the course in step (1) to repeatedly dry the coal obtained in step (1), wherein the course should be repeated 1-8 times. The method provided by the invention can greatly eliminate the moisture in the coal and obviously enhance the heat value of the coal.