3119results about How to "Simple operation process" patented technology

The invention discloses a biodegradable linear random copolyester, its preparation method and uses, wherein the copolyester has a structural unit of (1), wherein m is an integer of 2-10, n is an integer of 0-8, p is an integer of 2-10, m, n, p are identical or different, x is an integer of 1-10, y is an integer of 1-10, the average molecular weight Mw of the copolyester is 100,000-600,000g / mol, its molecular weight distribution is 1.2-3, which is measured through GPC method. The copolyester can be widely applied into section bar, film, fabric and coating.

The invention relates to an underground central pump room draining automatic monitoring system, which comprises a PLC control cabinet, a remote expanding module, a site data bus, a contact screen, an analog quantity and switching value input module, various monitoring probes, a travel switch, a level instrument and an executable section. A monitoring net adopts a form of combining a PROFIBUS DP site data bus and an industrial ethernet. A monitoring method for the system comprises: (1) monitoring the absorbing well water level; (2) monitoring the state for starting a high pressure switching cabinet by a water pump; (3) judging the valve levels of a gate valve, a ball valve of a water jet pumping device and a water distribution gate; (4) judging the valve levels of a vacuum pump ball valve; (5) measuring each equipment temperature measuring point; (6) measuring signals of a pressure sensor and a negative pressure sensor; (7) judging system faults; (8) automatically controlling the start-stop and operation numbers of the water pumps according to the absorbing well water level conditions; and (9) setting power supply peak avoiding time periods, and automatically selecting starting time and numbers of a pump. The system improves the system working reliability, reduces the equipment fault rate, and adopts a three-stage monitoring structure for a draining system.

The invention relates to organic-inorganic hybrid ultraviolet cured paint for metal surface protection. The paint comprises the following components in percentage by weight: 10 to 25 percent of epoxy modified silicon dioxide gel-resin, 15 to 30 percent of bisphenol-A epoxy acrylic ester, 5 to 15 percent of urethane acrylate, 35 to 45 percent of reactive diluent, 2 to 5 percent of toughener, 4 to 6 percent of photoinitiator, 0.5 to 0 percent of addition agent, wherein the epoxy modified silicon dioxide gel-resin is prepared by hydrolyzing a mixture of ethyl orthosilicate and gamma-glycidoxy propyl trimethoxy silane by a sol-gel method first and then adding diethylenetriamine. The paint film formed after the curing of paint has good strength, hardness, flexibility and strong acid and base resistance. The invention solves the problems that the organic-inorganic hybrid paint has high requirement on curing and common ultraviolet cured paint has poor adhesive force and flexibility when cured on metal base materials.

The invention relates to a new method for preparing hydrocarbons in the scope of aviation kerosene from C8-C16 furyl oxygen-containing organic compounds as raw materials by hydrogenation deoxidation reaction, wherein the C8-C16 furyl oxygen-containing organic compounds are obtained by C-C coupling of lignocellulose based platform chemical compounds; low temperature direct hydrogenation deoxidation under the condition of no solvent of the furyl oxygen-containing organic compounds can be realized by use of a metal-solid acid dual-functional catalyst to obtain a series of low freezing point branched alkanes having the chain in the length range of the aviation kerosene in high yield. The catalyst is composed of two parts of an active metal A and an acid vector X. The catalyst related in the method ahs the characteristics of being in no need of a solvent, simple in operation process, mild in reaction conditions, good in aviation kerosene (or diesel) selectivity, and the like, and is an ideal hydrogenation deoxidation catalyst for preparing liquid fuels from the furyl oxygen-containing organic compounds by the hydrogenation deoxidation.

The invention discloses a modified hot setting resin and a preparation method thereof. In parts by weight, the modified hot setting resin is obtained by evenly mixing 100 parts of hot setting resin, 0-100 parts of curing agent, 0-1 part of curing catalyzer, and 1-100 parts of hyperbranched silicon resin containing active functional groups at the temperature of 30-200 DEG C. The modified hot setting resin has high storage stability, processability and reactiveness and sufficiently integrates the performance advantages of hyperbranched polymer and polysiloxane, and thereby the obtained modified hot setting resin has high tenacity, more prominent thermostability and excellent dielectrical property as well as damp heat resistance. The preparation method of the modified hot setting resin has wide applicability, simple operating process and easy molding.

The invention relates to an energy-saving slag thermal insulator, and belongs to the technical field of energy conservation, emission reduction and comprehensive utilization in the metallurgy industry. The thermal insulator comprises the following main chemical components in percentage by weight: 25 to 70 percent of SiO2, 1 to 25 percent of Al2O3, 1 to 40 percent of CaO, 0 to 20 percent of MgO, 0 to 10 percent of F<->, 0 to 10 percent of R2O (R is a monovalent metal ion), 0 to 10 percent of Fe2O3, 5 to 60 percent of fixed carbon with bulk density of 0.25 to 0.75g / cm<3>. The thermal insulator has high thermal insulation performance and can reduce the thermal loss of high-temperature slag; the thermal insulator contains a certain amount of fixed carbon, so heat generated in the chemical reaction of the fixed carbon can be used for further making up the thermal loss of the slag; meanwhile, the thermal insulator belongs to a silicon-aluminum material, and part or all of the thermal insulator can be dissolved in the slag finally so as to improve the chemical composition of the slag and reduce the melting point of the slag. The thermal insulator has the advantages of simple production process, low cost, and suitability for various processes for utilizing the sensible heat of the slag, increasing the fluidity of the slag or improving the performance of the slag.

A processing method of tobacco raw materials for heating non-combustion tobacco products sequentially includes: adjusting moisture of the tobacco raw materials, heating at 100-300 DEG C for 0.5-8 hours; cooling at room temperature; balancing at 22 DEG C and 60% of moisture for 24-120 hours, applying glycoside aroma precursors, and standing for 48-120 hours to guarantee that the aroma precursors are fully absorbed by the raw materials; applying polyol to the raw materials after perfuming, and standing for 48-120 hours under a seal state to guarantee that the polyol is fully absorbed by the raw materials; balancing for 24-120 hours to obtain the tobacco raw materials for heating the non-combustion tobacco products. The tobacco raw materials processed by the method has the advantages that smoke releasing performance of the tobacco raw materials during heating of the non-combustion tobacco products is increased evidently, sensory quality of the released smoke is improved evidently, and good satisfaction and comfortableness are achieved.

The present invention discloses a nucleocapsid energizing agent for propelling agent and a method for preparing same, the energizing agent is a nucleocapsid structure energizing agent that carbon is encapsulated on a metallic oxide surfaced. The preparing method includes steps as follows: selecting one or some raw materials: address sugar, diose or soluble polysaccharide to mix according with random weight rate for confecting water solution 50-1500g / L, adding the surfactant or dispersant into the water solution, then adding the metallic oxide powder, the metallic oxide weight is 1-60% of the raw material total weight, the surfactants or dispersants weight is 0-4.5% of the metallic oxide weight, ultrasounding or stirring to distribute evenly, heating in 100-260 DEG C during 1-72 hours; reducing the product temperature to a room temperature, washing, centrifuging, removing the water-soluble impurity again and again, then vacuum drying for obtaining the nucleocapsid energizing agent. The nucleocapsid energizing agent has better compatibility with other component of the propelling agent, and has simple preparing technique, low cost, green process and is easy to mass production.

The invention discloses a method for lithium pre-embedment of a negative electrode of a lithium ion capacitor. The method comprises the following steps that a lithium sheet, a first diaphragm, the negative electrode, a second diaphragm and a positive electrode are sequentially stacked and packaged in a shell and after an organic electrolyte with lithium salt is injected, the lithium ion capacitor is assembled; on the condition that the temperature ranges from -30 DEG C to 60 DEG C, the negative electrode is electrically connected with the lithium sheet, discharging is conducted for one hour to sixty hours, and lithium pre-embodiment of the negative electrode is achieved. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, the negative electrode is electrically connected with the lithium sheet at the appropriate temperature, after discharging is conducted for one hour to sixty hours, the lithium sheet in the lithium ion capacitor can be slowly dissolved into the electrolyte to form lithium ions, so that the lithium ions are embedded in the negative electrode, lithium pre-embedment of the negative electrode is achieved, and the capacity of the obtained lithium ion capacitor is high. According to the method for lithium pre-embedment of the negative electrode of the lithium ion capacitor, it is only required that the electric connection mode of the negative electrode and the lithium sheet is controlled and the appropriate time and temperature are obtained, the lithium ion capacitor with the high capacity can be obtained, and the method has the advantages of being simple in operation process and the like.

The invention relates to the field of high-molecular composite materials, and concretely relates to a heat-conduction epoxy resin composite material and a preparation method thereof. The heat-conduction epoxy resin composite material comprises the following compositions in parts by mass: 0.5-3.0 parts of carbon nanotubes, 0.5-10.0 parts of nanometer aluminium nitride, 0.1-1.0 part of a silane coupling agent, 0.1-0.5 part of stearic acid, 60-80 parts of epoxy resin and 8-30 parts of a curing agent. According to the preparation method, amino-functionalized carbon nanotubes and nanometer aluminium nitride subjected to surface modification by employing a coupling agent are dispersed in epoxy resin, so that the epoxy resin material with heat-conduction function is prepared, the operation technology is simple, on the one hand, the heat conduction performance of the material is guaranteed, and on the other hand, the cost is reduced. The addition amount of functional materials employed by the composite material is less, the stability of the product is good, and the composite material is applicable to electric appliances, electron heat radiation and other aspects.

The invention discloses a method for preparing antarctic krill low-fluorine hydrolysis polypeptide. The method comprises the following steps of: performing enzymolysis on antarctic krill powder used as raw materials, heating and inactivating enzyme, centrifuging, adding calcium oxide at different concentration, defluorinating, uniformly stirring, performing centrifugal separation, adjusting a solution until the solution has a certain pH value, and performing spray drying on supernatant obtained through separation to obtain the antarctic krill low-fluorine hydrolysis polypeptide of which the fluorine content is 10 to 30ppm. The process is easy to operate, the obtained product has low fluorine content, the nutrition constituents are damaged slightly, consumed time is short, and the process is simple and efficient, and is an ideal method for removing fluorine from enzymatic hydrolysate. The method lays the foundation for developing the multi-functional antarctic krill low-fluorine polypeptide.

The invention discloses a device and a method of preparing an electrostatic spinning polymer / inorganic particle nano-composite film. The device of preparing the electrostatic spinning polymer / inorganic particle nano-composite film comprises an injector, an injection pump, a dipping tank, a receiving roller, a motor, a high-voltage power supply and a polymer spinning liquid storage tank. The preparation method comprises a step of preparing the electrostatic spinning polymer / inorganic particle nano-composite film by adopting a method of preforming electrostatic spinning while carrying out dipping adsorption, inorganic nano-particles are attached on the surfaces of the fibers, an ultra-strong adsorption character of inorganic nanometer materials is fully exerted, and on-line continuous preparation of the electrostatic spinning nano-composite film is realized with a simple operation process. In addition, an optional range of impregnation liquid is flexible, different inorganic nano-particles can be adsorbed on the electrostatic spinning film according to the actual requirement, so that all kinds of functional nano-composite films can be prepared, and the application range is wide.

The invention relates to a process and a device for smelting chromium irons and chromium-containing molten iron by using chromium ore powder, which belongs to metallurgical industry steel-making raw material. The process comprises the following steps: mixing chromium iron containing raw materials with reducing agent, solvent and catalyst to prepare ultra fine powder, mixing to make pelletizing materials, sending the pelletizing materials into a reducing furnace, obtaining chromium irons pellets after the reduction reaction, and directly adding reduced pellets into a lining electroslag furnace for being smelted into the chromium-iron alloy or the chromium-containing molten iron. The device comprises an internal-external heating vertical reducing furnace, a lining electroslag furnace and a residual heat recovery system. The invention has the advantages that: firstly, the reduction temperature is low, the speed is high, the energy consumption is reduced, the production cost is lowered, the production efficiency is high, and the uniformity of the quality is good; secondly, the degree of mechanization is high, the procedure is simple, the yield is large, the mass production can be performed; thirdly, the waste of raw materials is reduced, the environment pollution is lowered; fourthly, the source of raw materials adopting the chromium ore powder and chromium-containing waste, the cost is low; fifthly, the waste resource can be recycled so as to save the resource consumption; and sixthly, the high-temperature pellets are directly smelted by adopting the lining electroslag furnace, the heat efficiency is high, the energy consumption is low, the material purity is high and the quality is good, and the device is simple with less investment.

The invention discloses hyperbranched polysiloxane and a preparation method thereof. The hyperbranched polysiloxane contains a phosphaphenanthrene structure and an epoxy group simultaneously. The preparation method comprises the following steps of: mixing distilled water and epoxy group-containing trialkoxysilane uniformly according to a molar ratio, adding a catalyst A slowly and dropwise under the condition of stirring, and performing a reaction to obtain epoxy group-containing hyperbranched polysiloxane; mixing the epoxy group-containing hyperbranched polysiloxane and a certain amount of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide; and mixing the mixture and a catalyst B and alcohol solvent, and purifying, filtering and vacuumizing a crude product to obtain the hyperbranched polysiloxane containing the phosphaphenanthrene structure and the epoxy group. The hyperbranched polymer integrates the molecular characteristics of the hyperbranched polysiloxane, the 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide and the epoxy group, and has the huge application potential in the modification aspect. The preparation method has the characteristics of wide applicability and simpleoperational process.

The invention provides a solid biochemical paraffin prevention block for an oil well and a preparation method thereof, relating to a composition for treating organic deposits in holes or wells and a preparation method thereof. By using the solid biochemical paraffin prevention block for the oil well, the paraffin prevention period of the oil well can be effectively prolonged, and the output of the oil well can be improved; the operation process is simple; the solid biochemical paraffin prevention block is convenient, safe and environment-friendly in use, does not pollute crude oil, and is a long-lasting solid paraffin prevention agent; the unqualified products generated in the production process can be re-processed, thus no waste is generated in the production process, and the environment can not be influenced; and the product has a paraffin prevention rate not less than 75% and a paraffin prevention effective period not less than 240 days.

The invention relates to a high Cu-RE refining agent which has high efficiency and low burning loss rate and can be used for copper and copper alloy, applied to mass refining of the copper and the copper alloy, especially applied to refining and modification of red impure copper and white impure copper. The Cu-RE interalloy refining agent is prepared by a vacuum melting method, wherein, rare earth content is up to 30-65%; and only 2-6g / kg refining agent is added while the Cu-RE interalloy refining agent is applied to remelting refining of scrap copper. The Cu-RE refining agent enhances slagging and deslagging of copper fused mass, reduces deleterious substances in the fused mass of the scrap copper, and improves texture and performance of the copper and the copper alloy, therefore, products prepared from the red impure copper as a raw material reach or exceed the quality of the products prepared from electrolytic copper as a raw material, and the white copper process waste can be used for directly producing high-quality products after remelting refined, thus promoting recycle and reutilization of the scrap copper, saving energy and resource, reducing environmental pollution and generating significant economic and social benefits.

The invention relates to thermoplastic fluorine-containing fully aromatic polyimide powder, which has a general molecular structural formula shown above, wherein -R1 is a divalent linking group of fluorine-containing aromatic primary diamine; and -R2 is a divalent linking group of a molecule of aromatic acid dianhydride. The method comprises the following steps: reacting the fluorine-containing aromatic primary diamine with the aromatic acid dianhydride in a phenol solvent in the presence of a catalyst for 5 to 10 hours; pouring the hot solution in a precipitator with high-speed stirring to precipitate solid powder; and obtaining the thermoplastic fluorine-containing fully aromatic polyimide powder after filtration, washing, soaking, filtration and drying. The thermoplastic fluorine-containing fully aromatic polyimide powder has good solubility, is a high-performance heat-resistance toughness modifier for epoxy resin, unsaturated polyimide resin, unsaturated polyester resin and other thermosetting resins, and is good in application prospect, simple in operation, low in cost, environmentally-friendly, and suitable for industrial production.

The invention relates to the field of preparation of superhydrophobic coatings, in particular to a preparation method of a persistent icing-resistant superhydrophobic coating. The preparation method comprises the following steps: firstly, carrying out cleaning and sand-blasting roughen treatment on the surface of a substrate; secondly, blending epoxy resin, a curing agent and a first solvent to obtain an epoxy resin solution; thirdly, dispersing submicron particles and nanoparticles into a second solvent, and then adding a silane coupling agent to obtain particle composite suspension; fourthly, spraying the epoxy resin solution obtained in the second step on the surface of the substrate treated in the first step, and partially curing epoxy resin adhesive; fifthly, spraying the particle composite suspension obtained in the third step on the surface of the substrate obtained in the fourth step and completely curing; sixthly, obtaining the persistent icing-resistant superhydrophobic coating. The persistent icing-resistant superhydrophobic coating disclosed by the invention has the beneficial effects that the superhydrophobic coatings prepared on the surfaces of all the substrates have good durability and firmness and persistent icing-resistant property.

The invention discloses a sole plate post-poured strip form bracing system, applicable to sole plate post-poured strip form bracing of basement in constructional engineering. The form bracing system is mainly composed of components of a steel screen mould, a cable-stayed bolt and structural steel back plank, a precast slurry baffle concrete strick and a slurry baffle wood block. The invention utilizes a sole plate reinforcing mattress as a main bracing body, side pressure of concrete at the two sides of the post-poured strip can be effectively braced, the cavity of the formed post-poured strip is clean, tidy and clear and has no concrete pouring oozing or laitance pollution, most materials in the post-poured strip form bracing system are available and can be dismantled and recycled, and design function of post-poured strip can be effectively realized.

The invention discloses a hydrophilic polyvinylidene fluoride modified separation membrane and a preparation method thereof. The separation membrane is prepared from polyvinylidene fluoride, a polyvinylidene fluoride solvent, a carbon oxide carbon nano tube / graphene oxide and a pore-forming agent. According to the hydrophilic polyvinylidene fluoride modified separation membrane, on one hand, hydrophilicity of the separation membrane is enhanced through oxygen-containing functional groups in the carbon oxide carbon nano tube and graphene oxide, on the other hand, graphene oxide of a sheet structure enters a carbon oxide carbon nano tube network of a tubular structure for mutual intercalation to form a stable sandwich layered structure, therefore, agglomeration of the same nano structure bodies can be effectively inhibited, and migration and assembly of graphene oxide to the surface of a composite membrane are facilitated, and the contact area of the carbon oxide carbon nano tube and graphene oxide and macromolecule matrix in the composite membrane is remarkably improved, and thus, the hydrophilicity and anti-pollution capacity of the membrane are enhanced, so that the water flux of the membrane is substantially improved. In addition, the preparation method is simple in operation technology and is easily carried out.

The invention discloses a manufacturing method of active humic acid controlled-release fertilizer, comprising the following steps: taking weathered coal or lignite as raw materials; adopting the production equipment of compound fertilizer; taking sodium hydroxide and urea as an activator; in an activating reaction jar, activating and converting humic acid in the weathered coal or lignite by fusedurea liquid and sodium hydroxide to form the urea liquid containing the active humic acid; producing by combing with the compound fertilizer; injecting the urea liquid containing the active humic acid onto the compound fertilizer material in a granulation barrel to round and granulate; and drying, and screening to obtain the black, light and round humic acid controlled-release fertilizer product of different content proportions. In the manufacture scheme, the humic acid urea activating liquid has the following raw materials at the ratio of urea to humic acid to potassium chloride to water tosodium hydroxide of 100:100:(15-200):(5-15):(7-12), and other solid granulation raw materials (comprising urea, monoammonium phosphate, potassium chloride, ammonium sulphate, bentonite and the like) are designed according to nutrient content proportions of different fertilizers. In the manufacture method, humic acid activation and compound fertilizer production are organically combined and are carried out simultaneously, and thus the manufacture method has the characteristics of simple operation process, low cost, large production capability, black, light and round product particle, efficient controlled release of the nutrient, high utilization ratio, wide market prospect and the like, can greatly improve the yield and the quality of crop and improves fertilization soil.

The invention relates to the field of battery manufacturing, in particular to a method for preparing vanadium redox battery negative pole electrolyte, which is characterized in that industrial high purity V2O3 is adopted as raw material, proper additive and reducing agent are added into the raw material, and the vanadium redox battery negative pole electrolyte is directly prepared by a chemical method under the protection of high purity nitrogen. The method has the advantages of easily obtained raw material, low cost, simple reaction condition as well as simple and convenient operation; the prepared electrolyte is high in total vanadium concentration and good in stability, and has the using performance to be obviously improved in the low temperature environment; and the method is suitable for industrialized production.

The toughened thermosetting resin contains thermosetting resin and rubber granules whose mean grain size is 20-500 nm. Said resin is obtained by mixing the fully-vulcanized powder rubber whose mean grain size is 20-500 nm and thermosetting resin prepolymer and making their mixture undergo the process of solidification treatment. Said resin possesses obvious toughened effect, excellent impact resistance and high strength, modulus and heat resistance.

The invention discloses a nanocellulose / graphene composite flexible thin film as well as a preparation method and application thereof. According to the method disclosed by the invention, the surface of a graphene-shaped structure is uniformly coated with nanocellulose under the action of a hydrogen bond, Van der Waals force, a II-II bond and the like between a nanocellulose molecule and a graphenemolecule, so that a nanocellulose / graphene (CNC-G) composite flexible thin film with uniform distribution and a smooth surface is formed. The nanocellulose / graphene composite flexible thin film disclosed by the invention has good flexibility and transparency, can be uniformly dispersed in a solvent containing water and exists stably for a long time. The preparation method disclosed by the invention has the advantages of abundant raw material source, simple operation technology, low cost, greenness, environment friendliness, high efficiency and the like. The nanocellulose / graphene (CNC-G) composite flexible thin film disclosed by the invention has the advantages of high purity, uniformity in compounding and good composition structure and has a wide application prospect in the fields including flexible electronics, catalysis, electrochemistry and the like.

The invention provides an oil soluble molybdenum-based precursor of a catalyst, a preparation method and application thereof, relating to the technical field of heavy oil hydrocracking catalysts and solving the problems of low catalytic hydrogenation activity and high cost of the existing catalysts. The preparation method for the precursor comprises the steps of (1) mixing a molybdenum source with water, reacting for 30-240 minutes at 70-90DEG C, and adding inorganic acid; (2) adding polycarbon alcohol into P2S5 in 5-15 minutes at 50-80DEG C, and reacting for 1-3 hours at 70-100DEG C; (3) adding the product of step (2) into the product of step (1), adding resin, and reacting for 4-8 hours at 70-110DEG C; (4) separating oil phase from the product of step (3) so as to obtain the target product. The precursor can form MoS2 active components through self sulfurization and in situ decomposition, is used in slurry reactor hydrocracking of poor heavy oil with high content of metal, carbon residue and sulfur, and can lower the yield of coke and keep a device to run for a long period.

The invention discloses a new kind of carborane- silane- phenylacetylene polymer and the method for preparing the same. Said polymer employs methylchlorosilane, phenylacetylene, carborane and organic lithium agent as raw material, anhydrous tetrahydrofuran (THF) as dissolvent and preparing with protection of nitrogen. The invention moderates molar ratio between simple function group ethynyl compound and carborane to easily control molecular weight of polymer, crosslinking density and carborane content, and realizes purpose of adjustable polymer property. The invention is characterized by simple process and easy operation. The prepared polymer forms thermostable thermosetting material with excellent thermal oxidation performance by heat, light and chemical initiation. Said thermosetting material can be produced to ceramic structure by heating on air or inactive gas. The polymer can be used as base resin and thermo-stable coating for advanced complex material and for preparing ceramic pioneer body.

The invention relates to a nitrogen-doped carbon-supported monoatomic oxygen reduction catalyst and a preparation method thereof, and belongs to the technical field of electrocatalytic materials. Themethod is characterized in that a composite of a Zn-based bimetallic MOF and glucose is used as a precursor, the catalyst is obtained by high-temperature heat treatment and post-activation in ammoniagas, the monoatomic content is 2wt% to 4wt%, and the nitrogen doping amount is 4wt% to 15wt%. The addition of volatile Zn can increase the spatial distance of metal atomic nodes, the glucose can makea three-dimensional ZIF form a cross-linked structure, the structure and composition of a modulating material can improve the electrocatalytic activity, the nitrogen content can be further increased by post-activation treatment in the ammonia gas, and therefore, the electrochemical activity is improved. At the same time, the preparation method has the advantages of low cost, simple steps, mild conditions, good repeatability and easy mass production. The monoatomic catalyst exhibits good performance in an electrocatalytic oxygen reduction reaction (ORR) under an alkaline condition and has certain market application prospects.

The invention relates to a smelting process and a device of pure iron, belonging to metallurgical industry steel-making raw material. The process comprises the following steps: mixing iron-containing raw materials with reducing agent, solvent and catalyst to prepare ultra fine powder, mixing to make pelletizing materials, sending the prepared pelletizing materials into a reducing furnace, obtaining metallic pellets after the reduction reaction, and directly adding the reduced pellets into a lining electroslag furnace for being smelted into pure iron. The device comprises an internal-external heating vertical reducing furnace, a lining electroslag furnace and a residual heat recovery system. The invention has the advantages that: firstly, the reduction temperature is low, the speed is high, the energy consumption is reduced, the production cost is lowered, the production efficiency is high, and the uniformity of the quality is good; secondly, the degree of mechanization is high, the procedure is simple, the yield is large, the mass production can be performed; thirdly, the waste of raw materials is reduced, the environment pollution is lowered; fourthly, the source of raw materials adopting iron ore concentrate powder and iron-containing metallurgical waste, the cost is low; fifthly, the waste resource can be recycled so as to save the resource consumption; and sixthly, the high-temperature pellets are directly smelted by adopting the lining electroslag furnace, the heat efficiency is high, the energy consumption is low, the material purity is high and the quality is good, and the device is simple with less investment.

The invention belongs to the field of preparation of nano porous metal materials, and relates to a method for preparing nano porous silver based on an Ag-based amorphous alloy. By the method, the nano porous silver with the aperture of 20-100 nm is finally obtained by preparing a series of Ag-Mg-Ca amorphous alloy thin bands by taking the Ag-based amorphous alloy as a precursor by a solvent quick quenching method and then removing Mg and Ca elements by performing electric chemical alloy component corrosion removal by proper electrolyte. By the method, the structure and the size of the nano porous silver are adjusted and controlled by controlling the amorphous alloy components or electric chemical corrosion temperature; the operation technology is simple; and furthermore, the nano porous silver is extremely high in surface-enhancement raman scattering (SERS) performance and has a wide application prospect in the fields of environment friendliness, catalysis and biological sensors.

A method for preparing low-salt preserved bean curd comprises following steps: (1) sterilizing the bean curd prepared from soybean material and cooling to room temperature; (2) inoculating mold and fermenting for 24 to 48 hours; (3) adding an enzyme preparation to promote maturation, fermenting at 40 to 55 DEG C for 5 to 7 days; and (4) blending, properly packaging and sterilizing after maturation of the preserved bean curd to obtain low-salt preserved bean curd paste or pieces. The method shortens the preparation cycle of preserved bean curd, improves the product quality, and lowers the salt content in the preserved bean curd product, thus establishing the foundation for the quality improvement of conventional preserved bean curd and the modern industrial production.