40results about How to "Operating parameters are easy to control" patented technology

The invention provides a carbon dioxide subcritical extraction, recycling and reusing method for the electrolyte of a waste lithium ion battery, belonging to the field of recycling and reusing of solid waste. The method comprises the following steps: after complete discharging of the waste lithium ion battery, dismounting the waste lithium ion battery and removing a shell, positive and negative terminals, sealing rings and cover plates; transferring the electrolyte, current collectors with positive and negative electrode materials and a diaphragm into a supercritical extraction apparatus; adjusting the temperature, pressure, extraction time and flow of a supercritical carbon dioxide fluid and extracting an organic solvent and an additive; and subjecting the obtained solvent to component analysis, supplementing electrolyte salt, the organic solvent and the additive according to analysis results and adjusting a ratio to prepare electrolytes with different functions. The method effectively prevents degradation and dissipation of heat-sensitive substances; operation parameters are easy to control; extraction, separation and recovery are integrated together; later complicated treating procedures are omitted; and the utilization rate of resources is higher.

The invention discloses a whey protein active peptide with antioxidant activity and a preparation method thereof. The preparation method comprises the following steps: (1) adding protease into whey protein solution for enzymolysis, wherein the enzymolysis temperature is 40-60 DEG C, and the pH value is 6.0-8.0; (2) after enzymolysis, inactivating the protease; (3) precipitating the whey protein not hydrolyzed in enzymolysis solution, and removing the whey protein to take supernatant; (4) carrying out ultrafiltration on the supernatant by an ultrafiltration membrane the cut-off molecular weight of which is less than or equal to 10,000 dalton, collecting filter liquor of peptide the molecular weight of which is less than or equal to 10,000 dalton; (5) concentrating the filter liquor; (6) desalting the concentrated liquor; and (7) concentrating the desalted solution, and then freezing and drying. In the invention, the obtained whey protein active peptide has significant antioxidant property and specific functional characteristics and stable quality, and can be widely applied to the fields of food, cosmetics, medicine and the like. The production technology is simple and is convenientfor scale production, the raw material whey protein has high use ratio, and the production cost is low.

The invention discloses a fresh keeping agent containing essential oil, for fruits, and an application. The fresh keeping agent for fruits is characterized by being compounded from lysozyme, tea polyphenols, nisin, essential oil A, essential oil B, Vc and distilled water in a certain proportion. According to the fresh keeping agent for fruits, disclosed by the invention, the essential oil is optimized to be used as a main component of the fresh keeping agent, so that the fresh keeping agent has excellent effects of bacteriostasis and oxidation resistance and is applied to corrosion resistance and fresh keeping of the fruits, the fresh keeping and storage period of the fruits can be greatly prolonged, the fruits are guaranteed to maintain original quality in the fresh keeping period, and the quality of the fruits is effectively guaranteed. The fresh keeping agent for the fruits, disclosed by the invention is simple in compounding method, and convenient to apply; and the fresh keeping agent is completely compounded from natural components, and harmful chemical substances are not added, so that the fresh keeping agent is safe and environmental-friendly, and has an important industrial value.

The invention relates to a polymer matrix composite material which contains: a base material formed by polymer material, and a reinforced material dispersed in the base material, wherein the reinforced material contains micron level metal powder and nanometer level metal powder, and the powders appears in passivation state after passivated. The volume percent of the base material is 50-90%, the volume percent of the reinforced material is 10-50%, and the volume percent is based on the overall volume. By adding the reinforced material prepared with the mixture of passivated micro level and nanometer level metal powders to the base material according to a proper volume rate, the thermal conduction property of material can be effectively promoted and the aim of maintaining the property of low dielectric losses can be achieved.

The invention relates to the technical field of biomass fuels, in particular to biomass fuel and a production method thereof. According to the production method, the materials, such as biogas residue, crop stalks, marshal sludge and sawdust, are mixed prior to being treated via a fermentation process; thus, organics are biologically react microscopically, the materials act with one another, the structure of biomass is enhanced, crushing and compressing treatment of the materials is easier, the difficulty and energy consumption of the biomass fuel is lowered, and the cost of biomass fuel production is lowered. In addition, pulverized coal is subjected to crushing treatment and added with illegal cooking oil and gasoline; thus, the waste, the illegal cooking oil and the gasoline are made full use, the ignition point of the biomass fuel is lowered, and the ignition cost of the biomass fuel in applications is lowered.

The invention discloses a straw particle board manufacture method, which relates to a particle board manufacture method. The invention solves the problem that the straw surface includes a plurality of waxy layers and SiO2 substance, common urea formaldehyde resin glue and phenolic resin are hard to wet the straw surface to cause a plurality of gluing difficulty. The invention has the method that: the straw is cut into pieces and performed ash removal at first, and straw crushed aggregates which are performed with the pretreatment through the blending ratio of the 1:4 to 5.0 according to the mass ratio of the straw and alkali liquor is soaked in the alkali liquor of 1.4 to 1.6 wt percent (mass) for 10 to 15 hours, and the straw particle board can be manufactured after drying, glue applying, paving, pre-pressing, hot pressing, and cooling. The equipment performance request of the straw particle board manufacture through the invention is low, the method is simple, and the operation parameter is easy to control. The method of the invention for performing chemical treatment to the straw raw material surface improves the wetting property of the raw material, greatly enhances the inner combination intensity, enlarges the application scope of the straw, releases the lack of the timber resources, and the invention has great economic and social efficiency in the situation that the conflict between supply and demand becomes more prominent.

The invention discloses a preparation method of a high-activity SnO2-TiO2 composite nanometer photocatalyst, which comprises the following operating steps: (1) mixing tetrabutyl titanate, tetrabutyl titanate and glacial acetic acid, adding dilute nitric acid and water, stirring, and standing; (2) adding the SnCl4.5H2O solution to the mixed solution, stirring and ageing, wherein the molar ratio of titanium to tin in the mixed solution is (10-80):1; (3) putting the aged substance into an autoclave for constant temperature treatment for 22-27 h, and cooling to the room temperature; (4) using absolute ethyl alcohol to repeatedly wash the obtained cooled product, performing centrifugal separation, drying and grinding the separated product to obtain the high-activity SnO2-TiO2 composite nanometer photocatalyst. According to the invention, the high-activity SnO2-TiO2 composite nanometer photocatalyst is prepared through the sol-solvothermal method; the prepared photocatalyst has high activity, higher purity and excellent dispersity; the operating steps are remarkably reduced to be completed in 2-3 days and even shorter, so that more convenience and safety are realized, the reaction period is shorter and the operating parameter is easy to control.

The invention discloses a method for extracting rich bran nutrients through two stages of CO2 supercritical extraction. With the extraction method provided by the invention, the extraction rate of rich bran nutrients can be increased, and a part of coarse fiber can be converted into soluble dietary fiber. The nutrition constituents in rice bran are furthest utilized, poor taste caused by the coarse fiber can also be avoided, and the method has high industrial value.

The invention provides a blumea oil preparation and a preparing method thereof, wherein, the blumea oil preparation comprises blumea oil taking 5 to 80 percent of the total volume and medical supplementary materials. The blumea oil is extracted from the blumea by a supercritical extracting method, and the medical supplementary materials includes one or more than two mixtures selected form of 200 to 600 of polyglycol, glycerin, propanediol, whiteruss and ethyl oleate external-use liquid preparation solution. The blumea oil preparation provided by the invention takes the blumea oil extracted from the blumea by the supercritical extracting method as the main active component. When the preparation is used in curing, the blumea oil preparation is painted on relative acupuncture point on the body of the patient; the part of the point is irradiated for 15 to 20 minutes by infrared ray to realize the same curative effect with moxibustion. The mugwort is unnecessary to be burnt in the therapy process, thus, no excitant flavor emerges and the skin of the patient is safe from hurting. The invention is safer than the moxibustion, and the usage is convenient. Besides, the preparing method is very simple.

The invention discloses a welding system of a metal piece and a coaxial cable. The welding system comprises a heating device which is arranged at a processing station and is in contact with the metal piece or the coaxial cable to carry out heating, a solder feeding device which is arranged adjacent to the heating device and is used for adding brazing filler metal at a connecting part of the metal piece and the coaxial cable and a moving and positioning device which is used for separately clamping and transferring the metal piece and the coaxial cable to the processing station. The invention also discloses a welding method of the metal piece and the coaxial cable. The welding method comprises the following steps: preparing the metal piece and the coaxial cable, and transferring the metal piece and the coaxial cable to the processing station; adding the brazing filler metal at the connecting part of the metal piece and the coaxial cable at the processing station, and carrying out contact heating on the metal piece or the coaxial cable to realize welding; and transferring the welded metal piece from the processing station. According to the welding system and the welding method, the brazing reliability and conduction ratio of the metal piece and the coaxial cable can be well solved, the production efficiency can also be improved, and the production cost is lowered.

The invention relates to the technical field of medicine processing and discloses a proanthocyanidin extraction process from camellia seed hull. The extraction process includes: 1) a step of extracting proanthocyanidin in the camellia seed hull for 10-30 min by adoption of a supercritical CO2 fluid extraction method; 2) a step of simultaneously filtering and adsorbing the proanthocyanidin for 10-20 min by a flocculation clarification technology and a resin adsorption separation technology; and 3) drying for 20-30 min through a spraying drying process, and therefore the proanthocyanidin with a purity of 94-96% and an extraction yield of 1-3% can be obtained. The extraction process has characteristics of high extraction speed of the proanthocyanidin from the camellia seed hull, high efficiency and less energy consumption. Operation parameters can be controlled easily, thus effectively guaranteeing the stable product quality.

This invention provides a safe and high efficiency method for extracting bee pollen grease by using supercritical fluid. The method comprises: (1) adding bee pollen to an extractor, adding propane, butane or their mixture, and extracting under stirring; (2) removing the solvent from bee pollen and mixed oil, respectively; (3) recovering and recycling the solvents, and obtaining bee pollen and bee pollen grease. The method has such advantages as high efficiency, high extraction rate, short extraction time, low cost, low solvent consumption, and high product quality. The bee pollen grease can be used to treat cardiovascular diseases, inflammation and cancer, and can promote brain development.

The invention relates to the technical field of extracting of plant active ingredients and discloses a method for preparing and separating enkaurane-16-alkene-19-acid from wedelia trilobata. The method comprises the following steps of: drying, crushing and sieving the wedelia trilobata; putting the wedelia trilobata powder to an extraction kettle of a supercritical extractor for extracting, wherein an entrainer is alcohol, the extracting pressure is 20MPa-25MPa, the extracting temperature is 40 DEG C to 60 DEG C, the CO2 flow rate is 30L / h to 40L / h, and the extracting time is two hours to three hours; concentrating the extract under reduced pressure to obtain total extract, dissolving the total extract in water, extracting the solution for three times by using ethyl acetate and concentrating the organic phase under reduced pressure to remove ethyl acetate to obtain the extract; loading the extract to D101 macroreticular resin, eluting using alcohol aqueous solution, collecting the eluate, and concentrating under reduced pressure to obtain a crude crystal; and re-crystallizing the crude crystal by petroleum ether to obtain the product. The method disclosed by the invention is high in extracting speed, high in efficiency, less in energy consumption, and high in yield and purity of the obtained product.

The invention provides a method for preparing a dairy cow feed additive and belongs to the technical field of biology. The method comprises the steps of reacting at least one amino acid with rare earth to generate a rare earth amino acid complex; and mechanically mixing the rare earth amino acid complex with modified medical stone to obtain the rare earth amino acid-containing feed additive, wherein methyl p-hydroxycinnamate and dextro shikonin are contained in the rare earth aqueous solution for preparing the rare earth amino acid complex. The method for preparing the dairy cow feed additive,provided by the invention, has the advantages that the process is simple; the operating parameters are easy to control; the production energy consumption and the cost are low; the raw material loss is low; the purity of target products is high; the load capacity and the dispersing capacity are strong; and no side reaction occurs. The prepared additive is high in the stability and the absorptive utilization rate and low in the toxic and side effects and has the excellent properties of controlled release, moisture and water resistance, no oxidative deterioration and no agglomeration of particles.

The invention discloses a method for extraction of medicinal available composition from Chinese angelica with a supercritical carbon dioxide, belonging to the technique of extracting the medicinal available composition from Chinese angelica. The method contains the following process: adding the root of Chinese angelica into extraction kettle after disintegrating or cutting, and adding CO2 into extraction kettle after condensation and booster, the operation pressure of extraction being 10- 50MPa and the temperature being 32- 90 Deg. C, the mass ratio of entrainer ethanol to material being 0.5: 1- 3: 1, the entrainer being mixed and soaked with raw material or pumped by the entrainer pump and separated from solute and CO2 in separator after extraction, the pressure of the first stage separator being 3- 15MPa and temperature being 25- 40Deg. C, and the pressure of second stage separator being 3- 15MPa and temperature being 20- 30Deg. C, the product or solvent dissolved product being received from receiver, the solvent being evaporated and dried to prepare the final product, CO2 used circularly, and the whole extraction time being 0.5- 5 hours. The method has merits as the following: the energy consumption small, the operation simple, the extraction condition mild, the extraction time short, and so on.

The invention discloses a continuous grinding method for a brominated flame retardant, which comprises the following steps: (1) after uniformly mixing the brominated flame retardant, a reducing agent, a pH regulator and process water, obtaining mixed feed liquid; (2) continuously feeding the mixed feed liquid into a grinding machine for grinding through the bottom of the grinding machine, controlling a feeding speed, and causing the later mixed feed liquid entering into the grinding machine to drive the earlier mixed feed liquid entering into the grinding machine to move upward till flowing out of an overflow port at the top of the grinding machine, wherein the liquid continuously flowing from the overflow port is overflow feed liquid; and (3) after removing ferromagnetic materials from the overflow feed liquid through an iron-removing machine, performing solid-liquid separation, washing the obtained solid material with water and drying, and then obtaining the powdered brominated flame retardant with the grain size in a preset scope. The obtained product has the advantages of good color and luster, uniform grain size of the product, small size distribution scope and stable quality.

The invention provides medicinal composition soft capsules for improving anoxia tolerance and a preparation method for the medicinal composition soft capsules, and belongs to the technical field of health-care products and the fields of medicines, food and the health-care products. The preparation method comprises the following steps of: putting crushed integripetal rhodiola herb rhizomes and bee glue into a supercritical kettle, and extracting at the temperature of between 20 and 80 DEG C under the pressure of between 20 and 80 MPa for 1 to 6 hours to obtain a composition extract; dissolving 3 grams of composition extract subjected to supercritical extraction in edible oil in an amount which is 0.5 to 1.5 times that of the composition extract in a constant volume mode, adding a preservative and an antioxidant, and mixing uniformly; and loading the uniformly-mixed medicines into a soft capsule machine to obtain the soft capsules. According to the preparation method, an extraction process is simple, the quality is controllable, the content of active ingredients of the extract is high, and the cost is low, so the preparation method is suitable for industrial production; and the medicinal composition soft capsules are convenient to take, and have an effect of improving sleep.

This invention relates to a method for manufacturing fixed xanthine oxidase, which is composed of carbon nanotubes 40-49.5 wt.%, dihexadecyl phosphorous acid 40-49.5 wt.% and xanthine oxidase 1-20 wt.%. The method comprises the steps of: oxidizing the carbon nanotubs, washing with water to neutrality and drying, adding dried carbon nanotubes and dihexadecyl phosphorous acid into distilled water, ultrasonicating to obtain a dispersion, applying the dispersion to the substrate, drying to obtain a mixed membrane, and placing the mixed membrane in the xanthine oxidase solution for adsorption to obtain fixed xanthine oxidase. This invention can obtain three pairs of oxidation-reduction electrochemical signals of xanthine oxidase simultaneously, and the fixed xanthine oxidase can maintain its bioactivity and can catalyze the reduction of nitrate ions. The xanthine oxidase has good stability and reproducibility, and can be used to manufacture biosensors for detecting nitrate ions.

The invention discloses a preparation method and application of an N-doped FeMnO3 electrode material. The preparation method comprises the following steps: Mixing ferrous sulfate heptahydrate and manganese sulfate monohydrate according to the molar ratio of iron to manganese of 1:1, adding distilled water for dissolving, and preparing an iron-manganese mixed solution; carrying out a coprecipitation reaction at a constant temperature of 25 DEG C by taking an ammonia water solution as a precipitant, and carrying out aging, filtering, washing and freeze-drying operations after the reaction is finished, so as to obtain a precursor; and weighing 0-1.5 g of analytically pure NH4HCO3, dissolving the analytically pure NH4HCO3 in 15 mL of an ethanol aqueous solution, adding 0.1 g of the precursor into the ethanol aqueous solution, uniformly stirring the mixture, transferring the mixture into a crucible, putting the crucible into a muffle furnace, and carrying out annealing treatment at 1000 DEG C to prepare the N-doped FeMnO3 electrode material. The N-doped FeMnO3 electrode material is applied to a lithium ion battery negative electrode material, the cycle performance and the rate capability of the N-doped FeMnO3 electrode material are remarkably superior to those of the FeMnO3 electrode material, and the N-doped FeMnO3 electrode material has very excellent lithium storage performance. The preparation method has the advantages of simple steps, easily available raw materials, low cost and easily controlled operation parameters, and is convenient for large-scale production.

The present invention provides a method for extracting natural haematochrome from larch bark. The natural haematochrome is obtained by ultrasonic-assisted acetone extraction of the larch bark and membrane integration isolation and purification. The present invention makes use of larch bark collected from Great Khingan, the raw material is easy to get, and the cost is low. The ultrasonic is used for producing physical effects such as strong vibration, cavitation effect and stirring to destroy cell walls of plant cells so that the extraction solvent of acetone permeates into cells, and the active ingredients are soluble in the extraction solvent, thereby improving the extraction efficiency. At low temperature, the active ingredient of haematochrome is prevented from damage to a great extent. The extraction of haematochrome from the larch bark is realized successfully with high yield and high efficiency. The membrane integration purification has the characteristics of high efficiency, the undestroyed extracted material, and environmental protection.

The invention discloses a whey protein active peptide with antioxidant activity and a preparation method thereof. The preparation method comprises the following steps: (1) adding protease into whey protein solution for enzymolysis, wherein the enzymolysis temperature is 40-60 DEG C, and the pH value is 6.0-8.0; (2) after enzymolysis, inactivating the protease; (3) precipitating the whey protein not hydrolyzed in enzymolysis solution, and removing the whey protein to take supernatant; (4) carrying out ultrafiltration on the supernatant by an ultrafiltration membrane the cut-off molecular weight of which is less than or equal to 10,000 dalton, collecting filter liquor of peptide the molecular weight of which is less than or equal to 10,000 dalton; (5) concentrating the filter liquor; (6) desalting the concentrated liquor; and (7) concentrating the desalted solution, and then freezing and drying. In the invention, the obtained whey protein active peptide has significant antioxidant property and specific functional characteristics and stable quality, and can be widely applied to the fields of food, cosmetics, medicine and the like. The production technology is simple and is convenient for scale production, the raw material whey protein has high use ratio, and the production cost is low.

The invention provides a carbon dioxide subcritical extraction, recycling and reusing method for the electrolyte of a waste lithium ion battery, belonging to the field of recycling and reusing of solid waste. The method comprises the following steps: after complete discharging of the waste lithium ion battery, dismounting the waste lithium ion battery and removing a shell, positive and negative terminals, sealing rings and cover plates; transferring the electrolyte, current collectors with positive and negative electrode materials and a diaphragm into a supercritical extraction apparatus; adjusting the temperature, pressure, extraction time and flow of a supercritical carbon dioxide fluid and extracting an organic solvent and an additive; and subjecting the obtained solvent to component analysis, supplementing electrolyte salt, the organic solvent and the additive according to analysis results and adjusting a ratio to prepare electrolytes with different functions. The method effectively prevents degradation and dissipation of heat-sensitive substances; operation parameters are easy to control; extraction, separation and recovery are integrated together; later complicated treating procedures are omitted; and the utilization rate of resources is higher.

The invention discloses a method for extracting proanthocyanidins from dahurian larch barks. The method comprises the following steps of: (1) grinding dahurian larch barks into granules, and (2) performing supercritical extraction to obtain a proanthocyanidin extraction liquid. The method makes full use of dahurian larch barks in the Da Hinggan Ling area and has the characteristics that the raw materials are easily available, the cost is low, the yield of supercritical extraction is high, the extract is not damaged, and the production is safe and environment-friendly. The method can satisfy the needs for proanthocyanidins.

The invention provides a biomass fuel and a preparation method of the biomass fuel, and relates to the technical field of new energies. The biomass fuel comprises the following material components byweight: 110-150 parts of straw, 50-80 parts of saw dust, 50-80 parts of fallen leaves, 19-31 parts of sludge, and 10-17 parts of edible mushroom dreg. The provided biomass fuel takes the straw, the saw dust, the fallen leaves, the sludge and the edible mushroom dreg at certain proportion as the main raw materials, the various raw materials are from wastes, are mutually matched, and are fully burnt, the combustion heat value of the biomass fuel is 3500-4000 kcal / kg, the water content is less than or equal to 5%, the emission of the burnt waste gas is as follows: the NO2 is less than or equal to14.0 mg / m<3> (trace amount), the SO2 is less than or equal to 46 mg / m<3>, the smoke is less than or equal to 127 mg / m<3>, the emission is far lower than the national standard and is negligible, and the environment protection reaches the standard.

The invention discloses a gentamicin and vitamin B solid preparation for treating gastric diseases as well as a preparation method and application of the gentamicin and vitamin B solid preparation. The gentamicin and vitamin B solid preparation is prepared from the following components: 3800-4200g of gentamicin sulfate (by gentamicin), 8-12g of vitamin B12, 900-1200g of vitamin B1, 350-500g of vitamin B2, 300-450g of vitamin B6, 1800-2100g of talc powder and 49000-51000g of starch; the components can be totally prepared into 200,000 hollow gelatin capsules. By optimizing the compatibility andpreparation process of all the components, the prepared gentamicin and vitamin B solid preparation can continuously release medicines, provide a stable and long-lasting effective blood concentration and avoid or reduce a peak-to-valley phenomenon, so that the safety of medication use is better improved, and the adverse effects of the medicines are reduced.

The invention discloses a process for purifying sodium dehydroacetate by using supercritical fluid crystallization. The process comprises the following steps: (1) spraying neutralized impurity-containing 90 DEG C sodium dehydroacetate solution from the top of an extraction tower by using a feedstock pump, feeding supercritical fluid to the bottom portion of the extraction tower, and controlling the temperature of the supercritical fluid to be 33 to 36 DEG C, the pressure to be 9 to 11MPa and the flow to be 15 to 30m<3> / min; (2) reducing the pressure of high-pressure supercritical fluid containing dissolved sodium dehydroacetate to be below the critical pressure of the supercritical fluid through a throttling valve, and then enabling the supercritical fluid to enter a separation kettle; (3) after extraction of sodium dehydroacetate, enabling the product to sequentially pass through dehydration and drying processes. The process for purifying sodium dehydroacetate has the advantages that the process is simple and the equipment structure is compact; since the crystal layer is formed on the heat transfer surface but is not suspended in liquid during the process, the blockage of the equipment and pipes is avoided, the production faults are reduced, the purity of the product produced by using the process is high, the bioactivity is good and the grain size is uniform.

The present invention is poplar single ply intensifier and the method of intensifying poplar single ply therewith. The poplar single ply intensifier is prepared with styrene 24-26 weight portions, methyl methacrylate 48-52 weight portions, vinyl acetate 24-26 weight portions, 2azo diisobutyronitrile 2.8-3 weight portions, cobalt naphthenate 1.8-2.2 weight portions and zinc chloride 5.8-6.2 weight portions. The method of intensifying poplar single ply with the intensifier includes the following steps: preparing the intensifier, soaking poplar single ply inside the intensifier, sealing and pressurizing, ageing, and heating before drying. The present invention can raise the surface hardness of poplar single ply by 1.34-2.55 times, wear resistance by 2.35 times and static bending strength by 1.87-2.96 times.

The invention discloses a preparation method of Ainsliaea lactone substances. The lactone substances mainly comprise umbelliferone, Ainsliaea terpene, ainsliadimer A, gochatiolide A and the like. The invention particularly discloses the method for obtaining the Ainsliaea lactone substances by separating from Ainsliaea plants. The method comprises the following steps of raw material grinding, supercritical extraction, activated carbon decolorization, solvent extraction, dehydration, drying and the like so that the Ainsliaea lactone substances are finally obtained, wherein the total content of the umbelliferone, the Ainsliaea terpene, the ainsliadimer A and the gochatiolide A reaches above 60%.

The invention discloses a preparation method of a Mn-Ce-Ti-O composite metal oxide catalyst. The operation steps are (1) adding ethanol dropwise to tetrabutyl titanate; (2) dissolving manganese nitrate and cerium nitrate in ethanol Obtain the mixed solution of manganese nitrate and cerium nitrate; (3) join mixed solution in the material obtained in step (1), add citric acid to stir and dissolve and leave standstill to carry out an aging; (4) gac is added to step (3) The material obtained after the primary aging is subjected to secondary aging; (5) drying, grinding and calcining in sequence to obtain the Mn-Ce-Ti-O composite metal oxide catalyst. The catalyst prepared by the method of the present invention has high NOx elimination ability, high purity, and good dispersibility; through the addition ratio of manganese and cerium oxides limited by the present invention, the sol-gel can be better aggregated together to obtain a particle size Smaller particles, with greater surface area, expose more adsorption sites.

A welding system (2) for a metal piece (11) and a coaxial cable (12), comprising: a heating device (21) provided at a processing station and enabling the metal piece (11) or the coaxial cable (12) to enter a contact for heating; a solder feeding device (22) disposed adjacent to the heating device (21) and used for adding solder (13) to a joint of the metal piece (11) and the coaxial cable (12); and a moving and positioning device (25) used for separately clamping and transferring the metal piece (11) and the coaxial cable (12) to the processing station. The present invention also relates to a welding method for a metal piece (11) and a coaxial cable (12). The system and method can well improve the reliability and conduction rate of soldering of a metal piece and a coaxial cable, and can improve production efficiency and reducing production costs.