359results about How to "Craft short" patented technology

The invention relates to a production technology of black tea, in particular to the technical field of the black tea. The production technology of the black tea comprises the following working procedures: green removing, twisting, piling, drying at first time, steaming, compacting, fermenting and drying 2, wherein pulp filling is carried out on a tea leaf raw material before the green removing working procedure, and the mass ratio of water to tea leaf is 6-9% in the pulp filling process; and artificially adding inoculated strains between the steaming working procedure and the fermenting working procedure, wherein the artificially inoculated strains are one or more of Eurotium cristatum, candida albican and aspergillus niger. By adopting the production technology provided by the invention,time of a fermentation technology in the production process of the black tea is reduced, production efficiency is improved, and yield of the black tea is increased; meanwhile, the problem that the traditional black tea production technology is controlled by experience and level of a tea making master worker is solved, the time for producing the black tea by utilizing the technology is short, the produced black tea has good consistency, strong taste, pure fragrance, red-yellow soup colour and brown and bright leaf edge.

The invention belongs to a manufacturing technology of aluminum alloy and relates to a method for manufacturing a high-strength 7055 aluminum alloy forge piece formed by spraying. The method sequentially comprises the following steps: (a) melting components of 7055 alloy in an intermediate frequency furnace; (b) degassing, deslagging, refining and filtering an aluminum alloy fusant; (c) forming the filtered fusant by spraying to obtain a columnar aluminum alloy ingot blank; (e) carrying out hot extrusion on the aluminum alloy ingot blank formed by spraying; (f) constantly cutting the extrusion ingot as required and then carrying out free forging; (g) carrying out blocker-type forging and / or stamp forging on the blank after the free forging to obtain a stamp forging piece; and (h) carrying out T6 heat treatment on the stamp forging piece. A large-specification and high-property 7055 product can be obtained by using the method which is suitable for industrial production.

The invention is a ZSM-5 molecular sieve synthesizing method, belonging to inorganic chemical synthesis technical field. And it prepares the ZSM-5 molecular sieve by preparing guiding agent and reacting mixed solution, hydrothermal crystallization, and routine filtering, washing, drying and baking, where the guiding agent uses tetrapropyl ammonium bromide or tetrapropyl ammonium hydroxide as the first organic alkali template and the reacting mixed solution uses annular molecular amine- hexamethylene imine or piperidine or their mixture as the second organic alkali template; and it has advantages of omitting ion exchange procedure, short process, low producing cost, not discharging ammonium- and nitrogen- containing waste water, not polluting environment, etc.

The invention discloses a rotational molding wear-resistant polyolefin resin and a preparation method thereof. In the rotational molding wear-resistant polyolefin resin, raw materials commonly used in the rotational molding process, namely linear low-density polyethylene, high-density polyethylene or polypropylene is taken as a matrix material; and by adding components of an inorganic filler, ultrahigh molecular weight polyethylene and a lubricant, the wear resistance of the matrix resin is improved. The rotational molding wear-resistant polyolefin resin consists of the following components in percentage by mass: 70 to 80 percent of matrix resin, 10 to 15 percent of inorganic filler subjected to surface treatment, 4 to 13 percent of ultrahigh molecular weight polyethylene and 1.5 to 2 percent of lubricant, wherein the matrix resin is the linear low-density polyethylene, the high-density polyethylene or the polypropylene; and a range of a melt flow rate of the matrix resin is between 2g / 10min and 15g / 10min.

The preparation method to extract tea saponin from oil meal, which comprises smashing, removing enzyme, leaching with hot mixing to boost infiltration capacity, centrifugal solid-liquid separating to add flocculant, deposition separating, disc centrifugal separating for cleaning solution, prefiltration separating for flocculation deposition, nano-membrane concentrating, and spray drying. Wherein, using chemical treatment to inhibit and eliminate hydrolase activity before leaching. This invention is simple and low cost with yield more than 70% and 80% purity.

The invention discloses a process for preparing a metallurgical powder product from titanium hydride powder preparedmade by hydrogenating sponge titanium instead of titanium powder. The process comprises the following steps of: firstly, hydrogenating sponge titanium, crushing and, rating and mixing brittle titanium hydride, and mixing the titanium hydride with an alloy element; and then, carryingout near-net shape pressing to finish dehydrogenation in a vacuum sintering process. In the process of directly forming the titanium hydride powder, because of the secondary crushing of the brittle titanium hydride powder, the pressed green density is higher than that obtainedan occasion when titanium or titanium alloy powder is used, and the titanium is prevented from being oxidized. In the sintering process, the density of a sintering blank can rapidly rise (to be higher than 99 percent) because of the decomposition of the titanium hydride. The method has the characteristics short process flows, high yield and product density, low cost and oxygen content and good performance.

The invention discloses a microwave-assistant preparation method of hydroxylapatite nanometer structure porous microspheres. The microwave-assistant preparation method comprises the following steps of: mixing water-soluble calcium salt as a calcium source with pyridoxal phosphate as a phosphor source under an acidic condition; preparing hydroxylapatite nanometer structure porous microspheres as a carrier through a microwave-assistant hydrothermal reaction; adding the hydroxylapatite nanometer structure porous microspheres to organic solvent containing a hydrophobic drug or an aqueous solution containing hydrophilic protein; and oscillating the solution for 24-60 hours at 20-40 DEG C, and centrifuging, washing and drying the products to obtain the hydroxylapatite nanometer structure porous microspheres which are loaded with the hydrophobic drug or adsorbed with the hydrophilic protein.

The invention discloses a zirconia ceramic cylinder liner material and a preparation method thereof, and the material comprises the following components: 60-80 wt% of ZrO2, 20-30 wt% of Al2O3, 3.2-4.3 wt% of Y2O3, 3-4.2 wt% of TiO2, and 1.5-2.1 wt% of La2O3. The method prepares the ZrO2 ceramic cylinder liner material by using Al(NO3)3, ZrOCl2.8H2O, Y(NO3)3, TiCl4, LaCl3 as raw materials, using C6H12N4 as a precipitant, and by a coprecipitation method. Uniform mixing of each component at molecular level is effectively realized. The disadvantage of poor uniformity of the mixing of each component in the material due to routine ball milling mixing technology is overcome; the prepared zirconia ceramic powder has the characteristics of uniform dispersion, homogeneous particle size, and good fluidity; low-temperature sintering is realized; the ZrO2 composite ceramic material green body prepared by the method has bending strength of 980-1200 MPa, fracture toughness of 8.3-10 MPa.m1 / 2, vickers hardness of 2 GPa-14 GPa after calcination at 1330-1380 DEG C; the process is simple, and is applicable to large-scale production.

The invention relates to a directed graphite-copper composite material with superhigh thermal conductivity and high strength and a preparation method and application thereof. Specifically, the composite material is formed by graphite sheet layers and copper layers through hot-pressing sintering, and the graphite sheet layers and the copper layers are arranged in parallel in a directed mode. The ratio of the thermal conductivity of the composite material in the direction parallel to the X-Y direction to the thermal conductivity of the composite material in the direction perpendicular to the X-Y direction is not smaller than 4, the thermal conductivity of the composite material in the direction parallel to the X-Y direction is not smaller than 500 W / m.K, and the X-Y direction is parallel to the graphite sheet layers and the copper layers at the same time. The invention further discloses the preparation method of the composite material. As the graphite sheet layers of the composite material are arranged in the directed mode in the height direction and the copper layers are evenly distributed between the graphite sheet layers, the composite material has quite high thermal conductivity and low coefficient of thermal expansion. The preparation method is simple, low in cost and quite suitable for being popularized on a large scale.

The invention discloses an abrasion-resistant composite material of common polythene and a preparation method thereof. The composite material uses the common polythene as a base material, and improves the abrasion resistance of a matrix resin by adding abrasion-resistant stuffing and lubricating components. Simultaneously, the abrasion-resistant composite material retains the good processing property of the general polythene, and overcomes the defect that the polythene with super-high molecular weight is difficult to process. The abrasion-resistant composite material of the common polythene consists of the following components in percentage by mass: 73 to 90 percent of the polythene, 6 to 25 percent of the abrasion-resistant stuffing for surface treatment, and 2 to 4 percent of lubricating agent.

The invention provides an inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor and belongs to the optical fiber sensing technical field. According to the structure of the sensor, the interior of a hollow glass optical fiber is plated with silver, and the silver-plated hollow glass optical fiber is filled with liquid crystal; the inner diameter of the hollow glass optical fiber ranges from 300 microns to 500 microns, the numerical aperture of the hollow glass optical fiber is not lower than 0.27, and the length of the hollow glass optical fiber ranges from 30 mm to 50 mm; sensitization treatment is performed on the inner wall of the hollow glass optical fiber, and a 45nm-to 80nm uniform silver film is formed in the optical fiber through adopting a liquid phase chemical deposition method, and therefore, a sensing layer of surface plasmon resonance can be formed; and the hollow optical fiber is filled with thermotropic nematic liquid crystal, and plastic-clad multimode optical fibers are coupled to the ports of the optical fiber respectively, and end sealing processing is realized. With the inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor adopted, subtle temperature changes can be dynamically monitored in real time. The inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor is suitable for long-distance transmission. According to the inner wall-silver plated and liquid crystal-filled hollow optical fiber surface plasmon resonance temperature sensor, special inner wall silver plating technology is adopted, and the hollow optical fiber is filled with the thermotropic liquid crystal, and therefore, the oxidation of the external silver layer of the solid optical fiber surface plasma resonance sensor can be avoided.

The invention discloses plasma 3D printing remanufacturing equipment and method for a train wheel. The plasma 3D printing remanufacturing equipment consists of a monitoring system, a plasma beam processing system, a machining device for machining a train wheel to be repaired, a triaxial moving mechanism used for driving the machining device to move and a horizontal printing platform used for placing the train wheel to be repaired, wherein the plasma beam processing system consists of a plasma generator, a printing position adjusting device, an air supply device and a powder feeder; and the monitoring system comprises a horizontal movement controller, a temperature detection unit, a distance detection unit, a printing distance adjustment controller and a rotation controller, and the temperature detection unit and the printing distance adjustment controller constitute a temperature adjustment and control device. The plasma 3D printing remanufacturing method comprises the following steps: firstly, detecting defects of the train wheel; and secondly, repairing the train wheel. The plasma 3D printing remanufacturing equipment is reasonable in design, simple and convenient to operate, high in efficiency and good in using effect, the repair process is directly carried out in the atmospheric environment without a closed molding room, the repaired train wheel is good in quality, and the repair efficiency is high.

The invention discloses a nano silver-polyvinylidene fluoride composite separation membrane and a preparation method thereof. The separation membrane is obtained by modifying a polyvinylidene fluoride membrane with nano silver. According to the invention, two dispersion methods namely a physical method and a chemical method are simultaneously adopted in the preparation process, so that nano particle reaches an ideal dispersion effect in the polyvinylidene fluoride separation membrane and a reliable guarantee is provided for the excellent property of the membrane. In the invention, a noble metal nano silver the price of which is relatively low is added, and the amount of nano silver is regulated, so that the mechanical property, antibiotic property and pollution resistance of the polyvinylidene fluoride separation membrane are greatly improved, the water flux and trapping rate of the polyvinylidene fluoride separation membrane are also improved, the service life of the membrane is prolonged, and the membrane has high performance-to-price ratio.

The invention discloses a manufacturing method and a manufacturing device of a flexible printed circuit. The method mainly includes the steps of providing an imaging flexible printed circuit substrate which is coated with nanometer conductive ink or sizing agents; exerting pressure to the flexible printed circuit substrate; and sintering the flexible printed circuit substrate by using xenon lamp sintering technology at the same time when the pressure is exerted and obtaining a target product. By means of the method, a printed circuit can be rapidly manufactured on a low temperature flexible substrate, a metal film which is good in binding force, electrical conductivity and compactness can be obtained, and manufacturing cost is low. The method avoids the processes such as photoetching in the manufacturing process of a traditional flexible printed circuit, rapid and pollution-free flexible printed circuit manufacturing is achieved, and the method is suitable for the production and the manufacture of the flexible printed circuit of the low temperature substrate.

The invention discloses a preparation method for silk fibroin composite gel. The preparation method comprises the following steps: conducting a dissolution treatment on silk fibroin obtained by degumming in a LiBr solution; preparing a regenerated fibroin solution through dialysis; mixing the regenerated fibroin solution with Gamma- polyglutamic acid; finally, preparing the silk fibroin composite gel under the action of a cross linking agent. The preparation method is simple in technology and short in the gelation time; the efficiency is greatly improved; the required amount of the cross linking agent is small; the safety is strong; the prepared silk fibroin composite gel is degradable and has relatively high mechanical property and stronger water absorbability, so that the silk fibroin composite gel is superior to silk fibroin composite gel prepared from other methods. The silk fibroin composite gel can be used for the fields of medicine and health, tissue engineering, environmental protection and the like; the application of the silk fibroin composite gel is broadened and a novel thought and a novel method of preparing high-strength silk fibroin composite gel are provided.

A transducer comprises stationary scale, active scale, transducer coil, driving circuit and control circuit as metal reflecting conductor arranged uniformly as per certain wavelength period and certain ruled shape is erected on stationary scale, a numbers of transducer coils with specific distance and shape are set on active scale, coils are connected to pulse circuit through driver and output sampler of transducer coil is connected to single-chip computer which its output is connected to display through display circuit, to pulse circuit through controller and to external equipment through communication interface.

The invention provides a preparation method of a humic acid-containing fertilizer and soil conditioner composition, wherein the preparation method includes treating a humic acid raw material and an activating agent through a coal grinding machine to obtain the humic acid-containing fertilizer and soil conditioner composition. The method avoids a high energy consuming problem of humic acid wet production comprising firstly adding water to carry out a reaction and then carrying out evaporation drying to remove moisture and a solid slag pollution problem after solid-liquid separation, the process is simple and convenient, the flow is shortened, and the obtained product has stable quality.

The invention provides an adhesive composition used for a solar backboard. The adhesive composition is prepared from the following components in percentage by weight: 30% to 50% of polyester modified acrylic resin, 30% to 45% of polyester resin and 5% to 40% of an isocyanate curing agent. 2-methylene-1,3-dioxocycloheptane is used for being reacted with an acrylic monomer, so that modified acrylic resin of which a main chain contains more ester bonds is obtained; the modified acrylic resin can be preferably compatible with polyester, the modified acrylic resin and the polyester are cooperatively used, and the adhesive force of the adhesive for PET films, PVF films or EVA films simultaneously can be greatly improved, so that the using performance of the backboard adhesive is greatly improved.

The invention discloses a catalytic preparation method of dicyclopentadiene dioxide by quaternary ammonium heteropoly phosphato tungstate, which is characterized by comprising the following steps: epoxidation reaction: adding the raw materials of dicyclopentadiene, solvent I and quaternary ammonium heteropoly phosphato tungstate in a reactor, heating the temperature to 30-80 DEG C, stirring and dropwise adding aqueous hydrogen peroxide solution, and reacting for 3-36h under the temperature of 30-80 DEG C after dropwise adding; post-treatment: cooling the reacted materials to room temperature, evaporating solvent I by reduced pressure distillation and separating and removing water to obtain the mixture of the product and the quaternary ammonium heteropoly phosphato tungstate catalyst, dissolving and filtering the mixture by ethyl acetate to obtain filter cake, namely the recovered quaternary ammonium heteropoly phosphato tungstate catalyst, recovering ethyl acetate by performing reduced pressure distillation on filtrate to obtain the crude product, performing recrystallization on the crude product by solvent II, and drying to obtain the product. The invention has the advantages of convenient operation, high safety, small pollution, simple post treatment, and high product yield and purity.

The invention discloses a method for extracting and separating ganoderma lucidum polysaccharide from ganoderma lucidum sporocarp. The method comprises the steps of carrying out enzymolysis and extraction with complex enzyme on the ganoderma lucidum sporocarp to obtain enzymolysis solution, concentrating and separating the enzymolysis solution through a tangential flow filtering membrane to obtainultrafiltration retention solution, carrying out elution, separation and purification on the ultrafiltration retention solution with purified water through radial flow chromatograph to obtain polysaccharide eluent, and conducting reduced pressure concentration and drying on the polysaccharide eluent to obtain ganoderma lucidum polysaccharide, wherein the papain and and cellulose are mixed in a weight ratio of 1:2-4:1 to form complex enzyme. The invention builds a set of polysaccharide production process of ganoderma lucidum sporocarp from raw materials to products, the process is environment-friendly, fast and efficient and suitable for large-scale production and the process cost for refining ganoderma lucidum polysaccharide can be greatly reduced.

The invention discloses zr-based amorphous-crystal multiphase material, which is composed of Zr 45-50at%, Cu 36-40at%, Al 8-10at%, rare earth elements RE 0.5-2at% and allowance refractory element M, wherein the rare earth elements RE is one of Y, Dy, Gd, Er or Lu, the refractory element M is one of Ta or W, a second phase which is rich Ta solid solution or W compound with high melting point is precipitated from the zr-based amorphous-crystal multiphase material which is prepared through a metal mould casting method. The volume fraction of amorphous alloy in the multiphase material of the invention is 90-99%, which occupies absolute advantage, the zr-based amorphous-crystal multiphase material breaks the defects of single block amorphous alloy that the plasticity is bad, the single block amorphous alloy is abruptly invalid and brittle failure, the thermal stability is bad, and the like, the fracture strength in 22DEG C is 1800-2100MPa, the yield strength is 1600-1900MPa, the plastic deformation reaches 4-15%, and the applicable range of the material in the engineering structure and biomedical materials fields is extended.

The invention discloses a plasma 3D fast forming and remanufacturing method and equipment of train wheels. The equipment comprises a monitoring system, a plasma beam machining system, a machining device for machining to-be-repaired train wheels, a three-axis moving mechanism for driving the machining device to move and a horizontal printing platform for placing the to-be-repaired train wheels. The plasma beam machining system comprises a plasma generator, a gas supply device, a feeding device and a printing positioning adjusting device. The monitoring system comprises a horizontal movement controller, a temperature detecting unit, a distance detecting unit, a printing distance adjusting controller and a rotation controller, wherein the temperature detecting unit and the printing distance adjusting controller form a temperature adjusting and control device. The method includes the steps of firstly, detecting train wheel defects; secondly, repairing the train wheels. The plasma 3D fast forming and remanufacturing method and equipment has the advantages that the equipment is reasonable in design, simple to operate, high in efficiency, good in use effect and high in repairing efficiency, a closed forming room is not needed, the repairing process is directly performed under an atmospheric environment, and the repaired train wheels are good in quality.

The invention discloses a method for extracting high-purity manganese dioxide from manganese slag, which comprises the following steps of: at normal temperature, adding dilute sulfuric acid in an amount 1.1-1.5 times the theoretical amount into the manganese slag and leaching metal impurity ions in the manganese slag; filtering to obtain an acid solution with the pH of 1.0-2.0, adding a sodium chlorate or potassium chlorate solution in an amount 1.1-1.5 times the theoretical amount into the acid solution, carrying out hydro-thermal reaction for 1-3 hours at the temperature of 120-150 DEG C, filtering manganese dioxide precipitates generated by the reaction, carrying out acid washing with 0.05-0.15mol / L-1 of dilute sulfuric acid, drying at the temperature of 60-120 DEG C after water washing, and calcining for 1-2 hours at the temperature of 350-450 DEG C to obtain the manganese dioxide with the product purity of larger than 98 percent. In the invention, the extraction ratio of the manganese in the manganese slag can reach more than 93 percent, the purity of the obtained manganese dioxide can reach more than 98 percent, the economic value of products is high, and the method has short process flow and simple operation.

The invention provides a n- type Mg-Sb based room temperature thermoelectric material. A chemical general formula of the material is Mg3+DeltaMnxSb2-y-zBiyAz, wherein A represents oxygen family elements such as S, Se or Te, Delta is greater than or equal to -0.2 and is less than or equal to 0.3, x, y and z represent atomic ratios, x is 0.001-0.4, y is 0-1.0 and z is 0-0.2. The preparation method comprises the steps of selecting single elements with purity greater than or equal to 99% as raw materials according to the chemical general formula, proportioning and weighing the raw materials separately in an argon atmosphere, then putting the raw materials in a ball milling machine, adding stainless steel balls into the ball milling machine, and obtaining powder after the ball milling machine rotates at high speed; weighing the powder separately and then putting the powder in a graphite mold, then putting the mold in a high-temperature furnace, vacuumizing, sintering when the total air pressure is less than 4Pa, then cooling to room temperature after the sintering is ended. The thermoelectric material provided by the invention has higher room temperature thermoelectric figure of merit and better mechanical performance than traditional n-type bismuth telluride, and is low-cost; and the preparation method is easy to operate, is lower in cost, and has high controllability and repeatability.

The invention discloses a method for preparing pure physical refined oil and camellia oleifera seed oil by using three-stage molecular distillation. The method comprises the following steps: firstly, adsorbing crude oil of camellia oleifera seed by using a mixed adsorbent comprising activated clay and a self-prepared adsorbent, filtering, and removing colloid, peroxide and pigment to obtain bleached oil; secondly, deacidifying decolorized oil warp by the three-stage molecular distillation, further removing to obtain a peroxidation value, and carrying out refined filtration to obtain a finished product, wherein the first-stage molecular distillation realizes the effects of dewatering and degassing; the second-stage molecular distillation realizes the effect of removing free fatty acid; the third-stage molecular distillation realizes the effect of further deacidifying to obtain finished camellia oleifera seed oil with a low acid value. The whole refining process for the camellia oleifera seed oil, disclosed by the invention, is environmentally friendly, short in period and high in refining rate; the retention rate of vitamin E and squalene in finished oil is high; in addition, indicators of the finished oil all accord with the standards of national first-class edible oil.

The invention belongs to the technical field of preparation of cobalt manganese oxide and discloses a preparation method of layered cobalt manganese double-metal oxide as well as a product thereof. The preparation method comprises the following steps: (a) mixing water-soluble cobalt salt containing divalent cobalt and water-soluble manganese salt containing divalent manganese uniformly to form a precursor aqueous solution, adding the precursor aqueous solution into an alkaline aqueous solution of potassium permanganate or sodium permanganate, and mixing, stirring and reacting to generate precipitate; and (b) filtering out the precipitate, performing hydrothermal reaction, performing suction filtration and washing on the product after reaction, removing the residual solvent and drying to obtain the needed layered cobalt manganese double-metal oxide. By the preparation method, the obtained layered cobalt manganese double-metal oxide has uniform shape, enables cobalt and manganese elements to be precipitated uniformly and highly, has large specific surface area and has excellent methylbenzene catalytic combustion cavity; furthermore, the preparation method is simple, simple in requirement on equipment, low in raw material price, low in preparation energy consumption, high in repeatability and suitable for popularization and application.

The present invention relates to a method for manufacturing a graphene layer, comprising the following steps: providing a substrate; forming a metal layer on a first side of the substrate; forming a carbon source layer on the metal layer; providing a laser, which irradiates a second side of the substrate and passes through the substrate to form a graphene layer on an interface between the substrate and the metal layer; and providing an organic solvent and an acid solution to remove the carbon source layer and the metal layer respectively.

The invention relates to a method for extracting proanthocyanidins from a raspberry, which is characterized in that the method adopts ethanol as an extracting agent; and the extracting process comprises the following steps: controlling the four conditions of ethanol concentration, extraction temperature, material-to-liquid ratio and extraction time under normal pressure, and then filtering, refining, purifying, concentrating and drying the extracted solution to obtain a finished product, wherein the refining and the purifying adopt a macroporous adsorption resin. The method has the following advantages that: the content of the proanthocyanidins in the raspberry is high, and the efficiency of adopting an extracting method is high, so the dissolution rate of the proanthocyanidins can be obviously improved, the primary structure and activity are kept, more byproducts in a chemical synthesis method are avoided, and particularly the problem that the isomer of the product is difficult to separate to cause low purity of the product is solved; therefore, the method has broad application in the fields of food, medicine and the like. The method has low cost and high extracting efficiency, and can obviously improve the dissolution rate of the proanthocyanidins and keep the primary structure and activity; and the process is simple, efficient and quick, and has little waste liquid emission.

The invention discloses a direct lead smelting method for processing zinc smelting slag by matching. The method comprises the following steps of: drying zinc smelting slag at the first stage; batching the zinc smelting slag together with raw materials and solvents containing lead to obtain a lead-containing furnace charge with stable components; drying at the second stage and then ball milling; uniformly mixing the furnace charge with reducing agent coke and smelting return dust respectively according to preset measurements, and continuously adding the obtained mixed powder from an oxygen nozzle so as to ensure that the mixed powder enters a lead smelting furnace together with pure oxygen to carry out flash smelting and respectively obtain crude lead and secondary zinc oxide; sending slag into a fuming furnace for blowing or water quenching; and sending gas fume containing sulphur into a sulfuric acid system. The lead smelting method has short technological process and strong raw material adaptability and can smelt low-grade furnace charges containing more than 25 percent of Pb, and meanwhile, a large amount of the zinc smelting slag can be processed by matching. The lead smelting method can produce all crude lead in a metallurgical furnace, and the content of lead in the slag can be controlled to be below 3.5 percent without adopting a blast furnace or other devices to carry out high lead slag reduction. The lead smelting method belongs to true lead smelting or one-step lead smelting.