38results about How to "Reduce high temperature oxidation" patented technology

The invention discloses a three-phase controllable polar direct-current electric arc furnace power supply device which comprises a main transformer, a main loop and a control loop. Secondary side windings of the main transformer comprise a first winding and a second winding. The main loop comprises a first three-phase fully-controlled bridge rectifier circuit, a third three-phase fully-controlled bridge rectifier circuit, a fifth three-phase fully-controlled bridge rectifier circuit, a second three-phase fully-controlled bridge rectifier circuit, a fourth three-phase fully-controlled bridge rectifier circuit and a sixth three-phase fully-controlled bridge rectifier circuit, wherein the first three-phase fully-controlled bridge rectifier circuit, the third three-phase fully-controlled bridge rectifier circuit and the fifth three-phase fully-controlled bridge rectifier circuit are connected with the first winding, and the second three-phase fully-controlled bridge rectifier circuit, the fourth three-phase fully-controlled bridge rectifier circuit and the sixth three-phase fully-controlled bridge rectifier circuit are connected with the second winding. The control loop comprises six current transformers, a trigger, a pulse distribution circuit, a pulse inhibition circuit, a synchronous transformer and six pulse amplifying circuits. The three-phase controllable polar direct-current electric arc furnace power supply device is simple in structure, convenient to use and operate and capable of accelerating the melting speed of a direct-current electric arc furnace, reduces heat shut-down, improves heat efficiency, prolongs the service life of a furnace body of the direct-current electric arc furnace, and is high in practicability and convenient to popularize and use.

The invention relates to a method for preparing a chromium-based composite material for a connecting plate. Aluminum oxide is adopted by the chromium-based composite material for replacing Yttrium oxide in a commercial Cr-5Fe-1Y2O3 material, the aluminum oxide in a submicron level can be uniformly and dispersedly arranged in a chromium-based body, chromium oxide crystalline grains are prevented from being thickened and enlarged, and high-temperature oxidation of chromium is slowed down. The method comprises the preparing steps of firstly, preparing aluminum sol coating chromium powder; then mixing the aluminum sol coating chromium powder with alloying elements and a lubricating agent; then, forming in a pressing way; finally, cooling after high-temperature sintering. According to the method for preparing the chromium-based composite material for the connecting plate, disclosed by the invention, the technology is simple, and the prepared chromium-based composite material has excellent high temperature-resisting performance and corrosion resistance; compared with existing commercial Cr-5Fe-1Y2O2, the cost is low, meanwhile, the thermal expansion coefficient is close to that of other components of a solid fuel cell, large influence on assembling and use cannot be generated, the chromium-based composite material can be used as a connecting plate of a fuel cell and is a feasible material for replacing the Cr-5Fe-1Y2O2, and the chromium-based composite material is suitable for being produced in a large scale.

The invention relates to a method for treating solid waste through a rotary hearth furnace and belongs to the technical field of steel mill solid waste treatment. The problems that in the prior art, recycled zinc oxide powder is low in grade, and finished metallized pellets are high in pulverization rate are solved. The method for treating the solid waste through the rotary hearth furnace comprises the following steps of pelletizing, reduction and zinc-contained powder recycling, and a drying stage is further performed between the pelletizing and the reduction. The method for treating the solid waste through the rotary hearth furnace provided by the invention can be used for treating solid materials generated in the production processes of sintering, ironmaking and steelmaking.

The invention discloses a method for eliminating annealing white spots on the edge of a cold-rolled aluminum coil, and relates to the technical field of aluminum alloy heat treatment. The method comprises the steps: A, when complete annealing is about to be carried out, after the aluminum coil is pushed into an annealing furnace, filling the annealing furnace with high-purity inert gas, wherein the concentration of the inert gas reaches 90-98%; B, during annealing, increasing the temperature to 200 to 240 DEG C, preserving the temperature for 6 to 15 hours, and controlling the coiling tensilestress before annealing to be 25 MPa or more; C, after the heat preservation is finished, filling the annealing furnace with high-purity argon until the concentration of the inert gas in the furnace reaches 98-100%; and D, increasing the temperature to the target temperature for complete annealing, preserving the temperature, cooling to 200 DEG C or below along with the furnace, and discharging. Compared with the prior art, the method can solve the problem that the edge of an existing aluminum coil has white spot defects in the process of complete annealing.

The invention belongs to the field of food processing, and particularly relates to an efficient enzymatic refining process of edible vegetable oil. The process mainly comprises five steps of centrifugal filtration of crude oil, enzymatic degumming, enzymatic deacidification, enzymatic decolorization and molecular distillation deodorization to finally obtain finished oil. According to the invention, the process is mainly based on an enzymic method, is beneficial to environmental protection and beneficial to operation, reduces the refining loss of oil, improves the product yield and refining efficiency, and has a relatively good popularization value.

The invention provides a heat treatment process oil gas recovery device and a method. The method includes the steps that oil gas discharged by a heat treatment furnace is intensively collected througha pipeline, and the collected hot oil gas is subjected to multi-section heat exchange and cooling, so that rolling oil in the oil gas is condensed and separated out; multi-section heat exchange is carried out on the gas subjected to deep cooling and rolling oil removal again, heat exchange and temperature rise are carried out on the gas and hot oil gas exhausted by the heat treatment furnace, andthe heated gas enters into the heat treatment furnace to replace the hot oil gas; and an exhaust system and an air inlet system of the heat treatment furnace form a closed loop, inert gas is introduced into the closed loop to replace internal air, and inert gas such as liquid carbon dioxide or liquid nitrogen is introduced into the coldest end to deeply cool the oil gas. According to the heat treatment process oil gas recovery device and the method, pollution of the oil gas evaporated and discharged in the heat treatment process to the atmosphere can be eliminated, the rolling oil can be recycled, meanwhile, power consumption of the heat treatment furnace can be greatly reduced, and potential safety hazards caused by discharging of the hot oil gas are eliminated.

The present invention relates to a functional fermentation technology, especially a polyphenol red koje antioxidant preservative and its application technology. It is developed on the basis of the patent technology of ZL94115941.8. The polyphenol red koje antioxidant preservative is prepared from tea, red koje, glutinous rice, sugar, white Qu and water and through fermentation. It contains tea polyphenol, tea pigment, red koji saccharomycete and other active matters and has the functions of antioxidation, resisting free radical, inhibiting bacteria, antisepticising, etc. It may be used as additive for wine, beverage and food, especially in brewing high-quality beer.

The invention discloses a preparation method of a solid cored welding wire for molten-salt corrosion resistance nickel-base superalloy welding, and belongs to the technical field of metal welding. The method includes the technological processes of vacuum smelting, vacuum arc remelting, homogenization, hot forging cogging, hot rolling, solution treatment, acid pickling, coating, cold drawing, coating removal and bright annealing. The invention further discloses the solid cored welding wire for molten-salt corrosion resistance nickel-base superalloy welding. The solid cored welding wire is prepared through the method. Compared with the prior art, by the adoption of the method, high-quality solid cored welding wires of various diameters for molten-salt corrosion resistance nickel-base superalloy welding can be produced with the extremely-high rolling yield in a batch mode, and the prepared solid cored welding wire can meet the requirement for welding molten-salt reactor structural materials.

The invention discloses a method for reducing the content of tetravalent stannum in stannous mono-sulphate. The method for reducing the content of the tetravalent stannum in the stannous mono-sulphate comprises the following steps that a stannum granular layer is laid in the bottom of a stannous mono-sulphate electrolytic tank; a deoxidant is added into a dilute sulphuric acid, and the treated dilute sulphuric acid is obtained; the treated dilute sulphuric acid is added into the stannous mono-sulphate electrolytic tank till the liquid level of the treated dilute sulphuric acid is higher than a cathode by 2-4 cm, and the voltage of the electrolytic tank is controlled to be lower than 2.4 V; when the content of stannum ions in an electrolyte at the bottom of the stannous mono-sulphate electrolytic tank is greater than or equal to 85 g / L, the electrolyte is discharged out of the tank from an outlet, and the treated dilute sulphuric acid is supplement into the tank to maintain the liquid level of tank liquid to be an original height while the electrolyte is discharged; when the content of the stannum ions in the electrolyte at the bottom of the stannous mono-sulphate electrolytic tank is decreased to 80 g / L, discharging of the electrolyte and supplementing of the treated dilute sulphuric acid are stopped; and the electrolyte is subjected to condensation crystallization, obtained crystals are eluted by using an eluting agent and then dried, and the stannous mono-sulphate is obtained.

The invention relates to a method for preparing a chromium-based composite material for a connecting plate. Aluminum oxide is adopted by the chromium-based composite material for replacing Yttrium oxide in a commercial Cr-5Fe-1Y2O3 material, the aluminum oxide in a submicron level can be uniformly and dispersedly arranged in a chromium-based body, chromium oxide crystalline grains are prevented from being thickened and enlarged, and high-temperature oxidation of chromium is slowed down. The method comprises the preparing steps of firstly, preparing aluminum sol coating chromium powder; then mixing the aluminum sol coating chromium powder with alloying elements and a lubricating agent; then, forming in a pressing way; finally, cooling after high-temperature sintering. According to the method for preparing the chromium-based composite material for the connecting plate, disclosed by the invention, the technology is simple, and the prepared chromium-based composite material has excellent high temperature-resisting performance and corrosion resistance; compared with existing commercial Cr-5Fe-1Y2O2, the cost is low, meanwhile, the thermal expansion coefficient is close to that of other components of a solid fuel cell, large influence on assembling and use cannot be generated, the chromium-based composite material can be used as a connecting plate of a fuel cell and is a feasible material for replacing the Cr-5Fe-1Y2O2, and the chromium-based composite material is suitable for being produced in a large scale.

The invention discloses an infrared radiation coating suitable for a metal matrix and a preparation method, a mass ratio of a component A to a component B is 80-120%, wherein the component A comprises the following raw materials by mass percentage: 30-90% of transitional metal oxides infrared radiation powder, 2-20% of inorganic bind additive, 0-30% of silicon carbide, 0-30% of corundum, 0-20% of zirconia, 0-20% of Ni powder, 0-20% of Zn powder, 0-20% of Al powder, 0-1% of carbon powder and 0-10% of sodium fluosilicate; the component B comprises the following raw materials by mass percentage: 60-95% of sodium silicate, 0-35% of water, 0-3% of dispersant, 0-1% of thickener, 0-1% of defoamer and 0-1% of leveling agent. After drying and solidifying the coating, the surface of the formed coating is compact, the infrared radiation coating has excellent infrared radiation performance and high temperature stability, and can firmly bonded with the metal matrix.

The invention discloses a three-phase controllable polar direct-current electric arc furnace power supply device which comprises a main transformer, a main loop and a control loop. Secondary side windings of the main transformer comprise a first winding and a second winding. The main loop comprises a first three-phase fully-controlled bridge rectifier circuit, a third three-phase fully-controlled bridge rectifier circuit, a fifth three-phase fully-controlled bridge rectifier circuit, a second three-phase fully-controlled bridge rectifier circuit, a fourth three-phase fully-controlled bridge rectifier circuit and a sixth three-phase fully-controlled bridge rectifier circuit, wherein the first three-phase fully-controlled bridge rectifier circuit, the third three-phase fully-controlled bridge rectifier circuit and the fifth three-phase fully-controlled bridge rectifier circuit are connected with the first winding, and the second three-phase fully-controlled bridge rectifier circuit, the fourth three-phase fully-controlled bridge rectifier circuit and the sixth three-phase fully-controlled bridge rectifier circuit are connected with the second winding. The control loop comprises six current transformers, a trigger, a pulse distribution circuit, a pulse inhibition circuit, a synchronous transformer and six pulse amplifying circuits. The three-phase controllable polar direct-current electric arc furnace power supply device is simple in structure, convenient to use and operate and capable of accelerating the melting speed of a direct-current electric arc furnace, reduces heat shut-down, improves heat efficiency, prolongs the service life of a furnace body of the direct-current electric arc furnace, and is high in practicability and convenient to popularize and use.

The invention provides a U-shaped hollow electric heating radiant tube, which comprises hollow heating tube bodies arranged in a pair, a connecting portion, connecting tubes, a thermal insulation section and a fixing plate, wherein the connecting portion connects and communicates one end portions of the tube bodies to form a U-shaped structure, the connecting tubes are connected with the other ends of the tube bodies, the thermal insulation section composed of a thermal insulation material is arranged on the peripheries of parts of the connecting tubes, and the fixing plates for fixing the heating radiant tube and a boiler are arranged at joints of the hollow heating tube bodies and the connecting tubes; the end portions of the connecting tubes are provided with threaded structures; the connecting tubes are respectively provided with electrode connecting terminals which are connected with positive and negative electrodes of a power supply; and the joints of the hollow heating tube bodies and the connecting tubes are welded and connected with joints of connecting portion and the hollow heating tube bodies by means of circumferential seam fully welding. The U-shaped hollow electric heating radiant tube directly adopts the electric heating alloy to form the hollow heating tubes, and the weight of the material is only about 20% of the original, thereby significantly reducing the material cost, and significantly reducing the energy consumption required for heating; and the temperature control precision is high, the service life is long, and the heating power is high.

The invention discloses a nano polytetrafluoroethylene coating. The nano polytetrafluoroethylene coating is prepared from components in percentage by weight as follows: 15%-30% of nano polytetrafluoroethylene, 20%-40% of Arabia gum, 2%-5% of polyvinyl alcohol and the balance of water. During application, a titanium metal wire is dipped in and coated with the nano polytetrafluoroethylene coating and dried, then the dried titanium metal wire is drawn, the nano polytetrafluoroethylene coating on the surface of the drawn titanium metal wire is cleaned with hot water, and the titanium metal wire is dried. The nano polytetrafluoroethylene coating has excellent lubrication performance, the smooth surface of the to-be-drawn titanium metal wire can be well dipped in and coated with the nano polytetrafluoroethylene coating, so that the drawing technology is simplified, the production cost is reduced, the quality of the titanium metal wire is improved, the service life of the titanium metal wire is prolonged, environmental pollution caused by graphite powder and health problem of operators due to the graphite powder are greatly reduced, and the coating has the broad industrial application prospect.

The invention relates to a method for treating solid waste through a rotary hearth furnace and belongs to the technical field of steel mill solid waste treatment. The problems that in the prior art, recycled zinc oxide powder is low in grade, and finished metallized pellets are high in pulverization rate are solved. The method for treating the solid waste through the rotary hearth furnace comprises the following steps of pelletizing, reduction and zinc-contained powder recycling, and a drying stage is further performed between the pelletizing and the reduction. The method for treating the solid waste through the rotary hearth furnace provided by the invention can be used for treating solid materials generated in the production processes of sintering, ironmaking and steelmaking.

The invention discloses an anti-twining wire winder for wire heat dissipation. The anti-twining wire winder comprises a wire winder body, wherein first teeth and second teeth are arranged on the upper side and the lower side of the wire winder body respectively, and lock catch devices are arranged at two ends of the wire winder body. According to the anti-twining wire winder for wire heat dissipation, the first teeth and the second teeth are arranged on the upper side and the lower side of the wire winder body respectively, so that a wire can be uniformly wound in grooves of the teeth and prevented from being twined together, and the wire can be well stored and arranged; and meanwhile, the problem of a circuit fault due to high temperature caused by wire twining is also well solved, so that an extremely good protection effect on the wire itself and the whole circuit is achieved.

The invention relates to the technical field of welding wires, and specifically discloses a multi-strand stranded welding wire for a 3D printing wire material. The multi-strand stranded welding wire comprises a carbon dioxide storage tube, peripheral coarse wires and peripheral fixed stranded wires, wherein the number of the peripheral coarse wires is four, the number of the peripheral fixed stranded wires is four, the peripheral coarse wires are twisted on the carbon dioxide storage tube in a cross shape, the four peripheral fixed stranded wires are correspondingly positioned at gaps betweenthe peripheral coarse wires, the peripheral fixed twisted wires are stranded with the peripheral coarse wires, and the carbon dioxide storage tube is of a multi-section structure. According to the multi-strand stranded welding wire, carbon dioxide can be released during welding by adopting the carbon dioxide storage tube, so that a protection zone is formed at the welding position, high-temperature oxidation of a welding part is reduced, and the stranded stability and high deposition rate are realized by adopting the four peripheral coarse wires and the peripheral fixed stranded wires.