1122results about How to "Reduce burning loss" patented technology

The invention discloses a method for producing a voltage-bearing aluminum alloy tank body of an ultra-high voltage switch by a V-process, comprising the following steps: model making, thin film heating, thin film shaping (film absorbing), coating spraying, sandbox placing, ram-jolting by adding sand , back film covering, film loosening, core setting, box folding, pouring, removing box and shaking out. After the process is improved, an intermediate frequency furnace is utilized to melt and a crucible heat preserving furnace is utilized to modify and refine. When melting in the intermediate frequency furnace, microelements such as tombarthite and the like are replenished and a new non-stirring melting and refining technology is adopted so as to reduce oxide inclusion content in alloy liquid. Modification and refining treatment in the crucible heat preserving furnace ensures high purity degree and high component precision of aluminum liquid, and using pure aluminum alloy liquid can increase the ratio of acquiring qualified pressure-proof tank body foundry products.

The invention relates to a heating device for improving heating quality of steel billets and a using method thereof. The heating device comprises a heating furnace, a heat storage system blower, a flat flame system blower, a combustion-supporting air pipeline, a gas pipeline, a heat storage system draught fan, an air heat exchanger, a gas heat pipe exchanger, a smoke exhaust pipeline and a chimney. 2-4 ignition burners are arranged at a preheating section of a heating furnace, and 12-30 pairs of heat storage type burners and 4-12 flat flame burners are respectively arranged at a heating section and a soaking zone. The using method comprises the following steps of reasonable distribution of combustion-supporting air and gas flow rate of the heat storage type burners and the flat flame burners, sectional configuration of furnace temperature and heating time, preheating of combustion-supporting air and gas temperature through a high-temperature smoke gas and furnace tail gas in grades, alternative furnace feeding of cold and heat steel billets, intermittent movement of the steel billets, and vaporization cooling of the steel billets. The flow field in the furnace is modified through the system, the optimal configuration of flow rates of air and gas in the burner is realized through reasonable arrangement of gas and air pipeline systems, and the waste heat of high-temperature smoke gas of the heating furnace is gradiently utilized, thus the in-furnace time is shortened, the uniformity of heating the steel billets is improved, and the high-efficiency heating of the steel billets is realized.

The invention relates to a preparation process and a device of a nano-particle reinforced bimetal composite, the nano-particle reinforced bimetal composite comprises the following chemical components by weight percent: 6-25% of Cr, 4-18% of Ni, 1.0-4% of Mo, 1.0-1.8% of Si, 1.2-3% of Mn, 0.4-2.2% of B, 0.1-1.2% of MgO, 0.2-2% of CaF2, 0.2-0.7% of C, 0.2-0.8% of Nb, not more than 0.9% of one or the combination of CeO2, Y3O2 and La2O3, 0.0-0.8% of Co, and the balance of Fe, and mixed particles of nano-sized carbides, nitrides, borides or carbonitrides are added in alloy powder. The vacuum induction melting and the cladding processes and equipment are adopted for melting and cladding the mixture on a workpiece, the thickness of a cladding layer is 0.1-25mm, the cladding layer contains 1%-50% of nano-reinforcing particles of one or the combination of the carbides, the nitrides, the borides and silicides, and the cladding layer has special performances of wear resistance, corrosion resistance, electrical conductivity, self-lubrication performance and the like. A coating layer and a base material form the metallurgical bonding, thereby having high bonding strength, overcoming the drawbacks in various coating processes at home and abroad, leading the coating layer to avoid the defects of shrinkage cavities, inclusion, cracking, shedding and the like and having the advantages of high heating temperature, fast speed, high production efficiency, small energy consumption, simple preparation process and low cost.

The invention discloses a high purity smelting method for a nickel-based high-temperature alloy. The method mainly comprises the following steps: performing mother alloy smelting under high purity argon shield, performing mother alloy refining under high vacuum, and obtaining the nickel-based high temperature alloy with low impurity content. Because high-frequency induction heating is performed through water-cooling copper crucible equipment, and high-purity argon is introduced in the mother alloy smelting process, the alloy can be effectively prevented from being oxidized, impurity elements are prevented from entering, and burning loss of volatile elements is reduced. In addition, the equipment can realize rapid temperature rise and reduction, the high-impurity high-purity nickel-based high temperature alloy can be obtained in the process of mother alloy refining, and the method for smelting the nickel-based high temperature alloy is mainly applied to preparing a miniature sample of the nickel-based high temperature alloy.

The invention discloses a Cu-Fe alloy wire and a preparing method thereof, and belongs to the technical field of non-ferrous alloy. The preparing method includes the steps that an intermediate alloy with even ingredients is used as parent materials, wherein the ingredients of the parent materials comprise 45% to 60% of Fe, 0.20% to 0.35% of Ni, not smaller than 0% of RE and the balance Cu; and then cathode copper and the intermediate alloy parent materials serve as raw materials, and a casting-state alloy ingot is obtained through vacuum melting and further machined into the Cu-Fe alloy wire, wherein the wire is prepared from 8.0% to 13.0% of Fe and the balance Cu and unavoidable impurities. When the prepared Cu-Fe alloy is in the casting state and the forging state, Fe-Cu solid solution is good, Fe elements are evenly distributed without segregation, and good machinability is achieved. The diameter phi of the further-machined finished wire ranges from 0.05 mm to 0.1 mm, the tensile strength of the finished wire is larger than or equal to 440 N / mm<2>, and the elongation of the finished wire is larger than or equal to 10%. The Cu-Fe alloy further has the excellent electromagnetic shielding effect.

The invention provides a refining agent for melting processing of aluminium and aluminium alloy, and the refining agent comprises the following six components of KCl, NaCl, CaF2, Na2SiF6, Na3AlF6, C2Cl6. When the refining agent of the invention is used for melting of aluminium and aluminium alloy, the degassing and impurity-removing effect is better; the hydrogen content in aluminium alloy melt is lower; the burning loss of the metal can be reduced effectively; meanwhile the refining agent has certain heating effect, so the hot slag recovery is more convenient and the recovery rate is higher.

The invention discloses an alloy ingot for an automotive hub and a production method thereof. The alloy ingot comprises the following components: 6.8-7.2% of Si, 0.28-033% of Mg, 0.10-0.15% of Ti, 0.015-0.030% of Sr, less than or equal to 0.10% of Fe, less than or equal to 0.05% of Mn, less than 0.01% of zinc, less than 0.01% of Cu, less than 0.003% of Ca, less than 0.002% of P, less than 0.02% of other single impurity content, less than 0.1% of total impurity content and the balance of aluminum. The production method of the alloy ingot for the automotive hub comprises the following steps of: adding 3303 industrial metallic silicon and electrolytic aluminum liquid for batching, heating at an appropriate temperature and melting, spreading a covering agent so as to reduce oxidation slagging, stirring so that the industrial metallic silicon rapidly melts, keeping uniform temperature, slagging off, keeping melt clean, spraying powder and refining by adopting high-purity N2 and a refined powder spraying agent, controlling the temperature of a smelting furnace to 740-750 DEG C, adding Al-Sr alloy to aluminium water, carrying out secondary degassing and slagging-off by adopting a powder spraying refinement method, filtering to remove slag, and casting the alloy ingot in line with requirements. The alloy ingot obtained by the method has the advantages of stable and uniform components, compact structure and clean surface; and the production method is the best production method for producing the A356.2 alloy ingot for the low-iron high-end automotive hub.

The invention relates to an amorphous alloy inoculation method for treating cast aluminum alloy. The amorphous alloy inoculation method for treating the cast aluminum alloy comprises preparation of inoculant and amorphous inoculation treatment. The technological parameter of the inoculation treatment is as follows: adding a prepared amorphous thin strip into aluminum melt before the aluminum is cast, the temperature of the aluminum melt is from 750 DEG C to 770 DEG C; the added amount of the amorphous inoculant is 0.05-1.0 wt.% of the weight of the aluminum; the treating time of inoculation is 15-600 seconds; an auxiliary machinery stirs for 0-300 seconds; and auxiliary ultrasound shocks for 0-180 seconds. The inoculant utilized by the amorphous alloy inoculation method is multivariate amorphous alloy including Zr series, Ni series, Cu series, Al series, Ti series and the like, precious metal is not contained, and cost is lower. The inoculant is in a thin-strip shape, can be dispersed in the melt uniformly and conveniently, the actual receiving ratio of modificator is high, tissue after refining is uniform, the time of modification treatment and alloy solidification are greatly shortened, and production efficiency is high. Moreover, the amorphous alloy inoculation method for treating cast aluminum alloy is applicable to large-batch continuous production of the amorphous alloy for a long time.

The invention relates to a method for casting high-nickel austenite nodular graphite cast iron discharge branch tube. Wherein, the invention comprises preparing core, mixing sand, shaping, smelting, irrigating, thermally processing, machining, dropping, checking, and packing; the smelting comprises mixing material, controlling smelting, balling, and breeding, and the nickel is added at later period; adding chromium at overheated period of iron water; the balling agent is nickel magnesium silicon iron balling agent; the breeding agent is 75 silicon iron; the iron water is irrigated quickly to charge section; the irrigating temperature is 1460-1530Deg. C; the thermally processing increases the casting to 870-1000Deg. C; keeping temperature for 3-6hours, cooling to 620Deg. C, and discharging. The invention has high impact-resistance and worm-anti property, better corrosion-resistance and oxidization resistance.

The invention relates to a 3004 aluminum alloy material and a production method of a cast-rolling stock of a decorative strip of the 3004 aluminum alloy material. The compositions of the aluminum alloy material comprise smaller than or equal to 0.25 percent of Si, 0.20 to 0.60 percent of Fe, 0.10 to 0.15 percent of Cu, 1.0 to 1.20 percent of Mn, 0.85 to 1.25 percent of Mg, smaller than or equal to 0.05 percent of Ti, and the remaining amount of Al. The production method comprises the steps of smelting, refining, on-line degassing, grain refinement, filtration, cast rolling, and the like; during the smelting, 50 percent to 60 percent of electrolytic aluminum liquid and the rest of aluminum alloy waste materials are mixed and smelted; the compositions except Mg are added to the mixture; and after the steps of powder injection refining, slag skimming, magnesium ingot adding, furnace turning-down and refining are conducted, the stock of the strip is cast-rolled. A product of the production method has even and steady chemical compositions and can satisfy the mechanical property requirements of subsequent rolling, so that the yield of subsequent rolling is increased; by using the aluminum alloy waste materials as raw materials, the raw materials are saved; by directly adding the electrolytic aluminum liquid, gas loss in the melting process is reduced, and burning loss in the waste material melting process can also be decreased; and by using a cast-rolling manner to replace a hot-rolling manner, the process is simplified and the production cost is greatly reduced.

The invention discloses an environment friendly low-gas-content aluminum alloy ingot which comprises the following components in percentage by weight: 1.6-3.3 percent of Cu, 9.8-11.8 percent of Si, 0-0.29 percent of Mg, 0-0.08 percent of Zn, 0-0.8 percent of Fe, 0-0.48 percent of Mn, 0-0.48 percent of Ni, 0-0.1 percent of Ti, 0-0.1 percent of Pb, 0-0.2 percent of Sn, 0-0.25 percent of other trace elements and the balance of aluminum. Meanwhile, the invention also discloses a production method of the environment friendly low-gas-content aluminum alloy ingot. The environment friendly low-gas-content aluminum alloy ingot has the advantages of low gas and dreg content, high aluminum liquid cleanness and good mechanical and machining properties. The production method has the advantages of low production cost and high efficiency and effectively solves the pollution problem of the secondary aluminum industry.

The invention relates to a sintered flux for stainless steel surfacing with band electrode. One technical scheme of the sintered flux for stainless steel surfacing with band electrode includes that the sintered flux is formed by sintering the following components and the proportioned raw materials or materials, including 15-30 parts of CaF2, 20-50 parts of MgO, 1-10 parts of Al2O3, 15-30 parts of CaO, 25-50 parts of SiO2, and 1-5 parts of alloy powder. The another technical scheme includes that the sintered flux for stainless steel surfacing with band electrode comprises the following components and the proportioned raw materials or materials including 60-80 parts of CaF2,20-40 parts of Al2O3, 1-5 parts of CaO, 1-5 parts of SiO2, and 1-5 parts of alloy powder. The sintered flux has excellent performance and can meet the service requirements completely.

The invention discloses high-strength cast magnesium alloy and a preparation method thereof. The high-strength cast magnesium alloy comprises the following ingredients by mass percentage: 8 to 14 weight percent of Gd, 1 to 5 weight percent of Y, 0.6 to 2 weight percent of Al, less than 0.02 weight percent of impurity elements of Si, Fe, Cu and Ni and the balance of Mg. The preparation method of magnesium alloy comprises two process work procedures: smelting and subsequent heat treatment, wherein the smelting process work procedure is carried out under the protection condition of SF6 and CO2 mixed gas and comprises the steps of material baking, magnesium melting, Gd and Y addition, Al addition and casting, and the heat treatment process work procedure comprises solid solution treatment andaging treatment. Through the method of adding rare earth elements such as Al, Gd and Y into the alloy to generate Al-RE intermetallic compounds through in-situ reaction, the goal of refining crystalline grains is reached, the crystalline grain stability of the obtained high-strength cast magnesium alloy is excellent, the recession resistance performance of the refining effect is high, and higher tensile strength and elongation are realized.

An antiwear tubular welding tungsten carbide electrode for strengthening the surface of steel members, such as the surface of steel roller in roller bit, is composed of the welding tube and the filler consisting of sintered tungsten carbide particles, cast tngsten carbide particles, organic adhesive and powdered alloy containing Cr, Si, B, Mn and Ni.

A short-flow technology for manufacturing the heavy rails with 50 m in length includes such steps as refining molten steel, conticasting, step heating, shaping rolling, fine rolling, sawing by needed size, prebending-cooling, straightening, and inspection. Its advantages are short technological flow, high quality of product and low cost.

The invention discloses a submerged arc welding wire of a high tensile pipeline steel. The welding wire material comprises the following chemical components in percentage by weight: not more than 0.10 of C, not more than 0.6 of Si, 1.3-1.8 of Mn, 1.4-2.5 of Ni, 0.25-0.55 of Mo, not more than 0.12 of Ti, not more than 0.05 of V, not more than 0.35 of Cr, 0.0005-0.005 of B, not more than 0.015 of S, not more than 0.015 of P, and the balance of Fe and other inevitable impurities. The submerged arc welding wire of the high tensile pipeline steel provided by the invention has the yield strength of deposited metals of more than 690MPa and the tensile strength of more than 785Mpa, has attractive welding formation, high intensity, high flexibility and high crack resistance without defects of cracking, undercut and the like, and has favorable matching effect with X100 level pipeline steel plates, and meets the requirement on the welding of oil-gas transmission pipelines under the condition of higher pressure.

The invention relates to a hot rolled ribbed steel bar with yield-to-tensile ratio of less than or equal to 0.8 and Rel of more than or equal to 600MPa, which comprises the following chemical compositions in percentage by weight: 0.18-0.22% of C, 0.4-0.8% of Si, 1.2-1.4% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.065-0.08% of V, 0.020-0.030% of Nb, and 0.009-0.015% of N. A production method comprises the following steps: conducting conventional smelting and casting blanks; stacking and cooling the cast blanks to room temperature; heating a steel billet; conducting rough rolling; conducting fine rolling; naturally air-cooling to room temperature for later use. For the hot rolled ribbed steel bar, the yield strength is more than or equal to 630MPa, the tensile strength is more than or equal to 800MPa, the elongation rate A is more than or equal to 25%, Agt / % is more than or equal to 12.5%, and the hot rolled ribbed steel bar has excellent antisespic performance, namely the yield-to-strength ratio is less than 0.8, the hot rolled ribbed steel bar has excellent welding performance, the breaking positions after the hot rolled ribbed steel bar is elongated always occur on a parent metal, the bending test is qualified, and the hot rolled ribbed steel bar has no changing accidents or quality problem due to macro defect of the cast blanks.

The invention discloses a production method of a high-strength, high-conductivity and heat-resistant copper alloy, and belongs to the technical field of copper alloy machining. Accoding to the production method of high-strength, high-conductivity and heat-resistant copper alloy, the inner liner of a crystallizer adopted in the upper-induced continuous casting process is a carbon-carbon composite material so as to ensure the lubrication, high heat conduction and high temperature resistance properties; the temperature of the upper-induced continuous casting is 1180-1230 DEG C, the casting temperature is low so that the problem that molten liquid in the crystallizer is difficult to solidify and the crystallizer inner liner is worn during casting can be effectively avoided; the pressure of protective gas nitrogen in the liquid surface of an upper-induced furnace is controlled to be 0.2-0.7 atmosphere, so that the phenomenon of solid-liquid interface separation in the crystallizer is avoided, and a copper-chromium alloy product with larger weight and length is produced; according to the production method of the high-strength, high-conductivity and heat-resistant copper alloy, the cheapelement (Mg) is used for replacing the rare noble metal, and the mechanical property and the softening resistance property of the copper-chromium alloy are improved; and the production method is a non-vacuum and short-process preparation technology, the cost is low, and the production method is suitable for large-scale industrial production and has important economic and social significances.

The invention discloses rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel is characterized by comprising the following chemical components in percentage by weight: less than or equal to 0.07% of C, less than or equal to 1% of Si, less than or equal to 1% of Mn, less than or equal to 0.035% of P, less than or equal to 0.03% of S, 3.00-5.00% of Ni, 15.5-17.5% of Cr, 3.00-5.00% of Cu, 0.15-0.45% of Nb, 0.05-0.25% of Re and the balance of Fe and belongs to the field of alloy steels. The invention also discloses a preparation method of the rare-earth-type 0Cr17Ni4Cu4Nb martensitic precipitation-hardening stainless steel. The preparation method comprises the steps of smelting, casting, carrying out electroslag remelting, casting ingots, forging or rolling, carrying out solution treatment and the like. The rare-earth-type 0Cr17Ni4Cu4Nb special steel, which is disclosed by the invention, as one of precipitation-hardening martensitic stainless steel, has the characteristics of high strength, high hardness, corrosion resistance and the like and is suitable for various technical fields, such as chemical machinery, food machinery, papermaking machinery, aerospace and marine.

The invention relates to the aluminum processing industry, in particular to a continuous casting and rolling process for producing 5005 aluminum-plastic strip blanks. The invention includes a holding furnace, an aluminum melting furnace, an on-line refining device, a two-stage filter item, and a continuous casting and rolling unit used in the production method. The process method includes the following steps: 1) batching step; 2) furnace loading step; 3 ) melting and stirring steps; 4) slag removal, sampling and analysis steps; 5) degassing refining, standing, heat preservation steps; 6) online melt processing steps; 7) continuous casting and rolling steps; 8) coiling and shearing steps ;9) Check the steps. The advantages of the method of the present invention: due to the use of 80% electrolytic aluminum liquid in the production process, the burning loss of aluminum is reduced to below 15‰, and the unit consumption of natural gas is reduced to below 80Nm3 / tAl, which is similar to the production of 3005 aluminum-plastic strips by using aluminum ingots for remelting Compared with the casting and rolling method of the billet, the burning loss and energy consumption of aluminum are reduced by 50%; the finished product rate reaches more than 99%. The invention discloses a continuous casting and rolling process for producing 5005 aluminum-plastic strip blanks, which is suitable for domestic and foreign aluminum and aluminum alloy casting industries.

The invention relates to a method for preparing a 5182 big flat ingot with high performance by a short flow process. The big flat ingot is prepared from a part of electrolytic aluminum liquid which replaces an electrolytic re-melting aluminum ingot, wherein the electrolytic aluminum liquid accounts for 40-70% of the raw material, and the balance is solid materials, such as secondary waste materials of the electrolytic re-melting aluminum ingot, an intermediate alloy or related alloy. is the method comprises the steps of: raw material charging sequence: firstly adding the solid materials; fused mass refining: pre-treating the aluminum fused mass by using a deslagging agent without Na powder and then spray-refining for 15-45 min by using N2-C12 mixed gas and a small amount of powder refining agent in the aluminum liquid; and online fused mass treatment: degassing by using Ar gas on a rotating degassing device, such as a DDF or a Mint and the like, tubular filtering and ceramic plate double filtering, and continuously online feeding Al-Ti-B or Al-Ti-C wire. The flat ingot is a cuboid or a similar cuboid with the length not less than 2,000 mm, the width not less than 1,000 mm and the thickness not less than 300 mm. The method has the advantages of shorter process flow, lower production cost, environmental protection and energy saving, and the like.

The invention relates to a micro-nano-alloy bimetal composite material preparation technique and a device thereof; one of wear-resistant and corrosion-resistant ferrous metal material, non-ferrous metal material and various self-fluxing alloy is prepared into power; then, the powder is added with less than or equal to 0.8% of one or combination in CeO2, Y2O3 and La2O3, 0.3-1.5% of MgO, 0.3-1.8% of CaF2, 0.0-1.5% of B, 0.1-0.8% of Nb, 0.1-1.0% of Ti, 0.1-2.0% of grain refining and recrystallization inhibitor according to the mass percent; or the powder is added with 1-40% of carbide, nitride, micro-nano or nano particles of boride; and the mixture is put into a high-energy stirring ball grinding mill for grinding and ball milling, so that the micro-nano or nano alloy powder can be prepared. A variable frequency induction heating device is adopted for cladding and melting vacuum or inert gas, so that a workpiece can be melted and coated with a micro-nano or nano scale alloy cladding layer which has the grain size of 0.1-35mm and is wear-resistant and corrosion-resistant, and the bimetal composite material can be prepared. The invention overcomes the defects in various coating techniques in China at present, can complete the preparation of the workpiece with the cladding layer having high thickness for once, does not need repeated coating and sintering, has high material utilization rate, low machining allowance and preparation cost, simple preparation technique and high production efficiency.

The invention relates to an in-situ particle reinforced aluminum matrix composite material, in particular to a cross-scale in-situ particle reinforced aluminum matrix composite material and a preparation method thereof. The method comprises the following steps of: melting Al-Si alloy; adding 10-25 percent by weight of SiO2 for melting according to proportioning requirement of volume fraction of reinforcing particles of different scales in the composite material; heating to 800-850 DEG C, preserving the heat for 5-10 minutes and then refining; subsequently performing ultrasonic treatment; adding 1-2 percent by weight of titanium powder and 0.3-0.5 percent by weight of rare earth during ultrasonic treatment; standing for 5-10 minutes; slagging off; adjusting temperature for pouring; and finally forming (Si+Al3Ti) microparticle and Al2O3 nanoparticle reinforced aluminum matrix composite material. The method has the advantages of simple preparation process, low cost, low overall reaction temperature and less aluminum burnt loss.

The invention relates to a preparation method of a high-quality Al-Ti-B-Sr master alloy composite refining modifier. The preparation method comprises the following steps: firstly melting a pure aluminum ingot in an aluminum melting furnace, and then pouring into a medium-frequency induction furnace to be ready for alloying; then weighing K2TiF6 and KBF4 raw materials, uniformly mixing, and pouring into the molten aluminum to be alloyed in the medium-frequency furnace; performing reaction for a certain period of time, then pouring the remaining mixture of K2TiF6 and KBF4 into an aluminum melt, and pouring away water granulated slag after the end of the reaction; performing degassing and re-deslagging treatment, and then gradually adding a certain weight of Al-20Sr alloy wires; performing stirring, re-deslagging and degassing treatment, and directly pouring to form Al-Ti-B-Sr alloy rods; and then sending the alloy rods onto an extruding machine to perform sectional area large-deformation thermal extrusion treatment and finally obtaining the Al-Ti-B-Sr master alloy composite refining modifier wires with the diameter of 9.5mm. The preparation method is characterized by combining a three-step charging method and a thermal extrusion molding process.

The invention relates to a refining agent for smelting an aluminum alloy. The refining agent is characterized by comprising the following components by mass percent: 35% to 45% of NaCl, 25% to 35% of KNO3, 3% to 8% of CaF2, 6% to 10% of Na2SiF6, 7% to 12% of Na3AlF6, 5% to 10% of graphite and 0.5% to 1.5% of rare earth. The refining agent has the characteristics of good refining effect, strong degassing capacity and the like, and cannot generate noxious gas during a production process.

The invention discloses a method for efficiently regenerating cast aluminum alloy by aluminum scraps. The method for efficiently regenerating cast aluminum alloy by aluminum scraps comprises the following processes of: screening, smelting, alloy-mixing and pouring, wherein the screening process specifically comprises the following step of: removing impurities and moisture in the aluminum scraps; the smelting process specifically comprises the step of melting and stirring the aluminum scraps after the screened aluminum scraps are charged, so that the slag is removed; the alloy-mixing process specifically comprises the following steps of: adding 9%-11% (in percentage by weight) of Si and 0.8%-1.1% of Fe when the temperature of the impurity-removed aluminum scrap solution reaches 680 DEG C to 740 DEG C, keeping the temperature after the components are uniformly stirred and removing the slag; and the casting process specifically comprises the following step of: pouring the slag-removed molten aluminum to the mould to obtain the cast aluminum alloy ingot or the aluminum alloy casting piece. According to the method for efficiently regenerating cast aluminum alloy by aluminum scraps, the aluminum scraps are enabled to reach the technical requirements of the cast aluminum alloy by aluminum scrap screening and alloy mixing, and therefore, the method has the advantages of being simple in process, strong in aluminum scrap adaptability, stable in aluminum alloy stability, low in cost, and high in aluminum recycling rate.

A low-pressure casting device for aluminum alloy wheels of an automobile is composed of a low-pressure casting system control cabinet, a pressurization air inlet tube, a pressure relief air outlet tube, a molten aluminum heat preservation furnace, an iron sprue, a ceramic heat preservation cup, a molten aluminum lifting tube, a heat insulation layer, twelve to sixteen buffer holes and a ceramic filter net. The two ends of the pressurization air inlet tube and the two ends of the pressure relief air outlet tube are connected with the low-pressure casting system control cabinet and the molten aluminum heat preservation furnace. A pressure control valve is installed in the low-pressure casting system control cabinet and arranged at the end of the pressure relief air outlet tube. A pressure relief zero return button and a cumulative number zero clearing button are arranged in the low-pressure casting system control cabinet. The iron sprue is assembled at a die feed inlet, the ceramic heat preservation cup is assembled under the iron sprue, the molten aluminum lifting tube is assembled in the molten aluminum heat preservation furnace, the upper end of the molten aluminum lifting tube is provided with the heat insulation layer, the inner diameter of the part, immerged in molten aluminum, of the lower end of the molten aluminum lifting tube is greater than that of the upper end, the buffer holes with the diameter of 10-12mm are formed in the lower end of the molten aluminum lifting tube, and the included angle formed between each buffer hole and the vertical plane ranges from 15 degrees to 20 degrees. The low-pressure casting device for the aluminum alloy wheels of the automobile can remarkably reduce the burning loss, the heat loss, needle holes and slag holes.

The invention provides a method for preparing a high-dispersibility and high-sphericity superfine silver powder on a large scale. The method is characterized in that the silver powder is prepared by taking water as a solvent, synthesizing a silver-salt alkaline solution precursor at first, adequately mixing a surfactant aqueous solution (used as an auxiliary morphology modifier) in the silver-saltalkaline solution and an ascorbic acid solution (used as a reducer), and reacting through an alkaline solution (used as a main morphology modifier). The high-dispersibility, high-compaction, low-burning-loss and high-sphericity superfine silver is obtained in one step through adjusting reaction parameters. The preparation method provided by the invention is simple and convenient to operate, low in reaction cost, high in silver powder yield, high in repeatability, applicable to large-scale industrialized production, and especially suitable for silver paste for electric contact materials and plasma display electrodes.

An oil-soluble multifunctional additive for heavy oil or fuel oil contains more surfactants, composite catalytic combustion adjuvant and detergent disperser, and is characterized by saving oil by 10-25%, increasing added water to 10-30% and eliminating black smoke. A process for preparing emulsified heavy oil or fuel oil is also disclosed.

The invention discloses a method for extending initiation time of a nodulizer and a nodulizer with long initiation time (the environment-friendly nodulizer ). The method is characterized by coating a layer of heat insulating materials on the surface of the nodulizer. The nodulizer is protected by the layer of heat insulating materials, the temperature cannot be risen promptly, and detonation cannot occur promptly, thus the initiation time of the nodulizer is extended. The heat insulating material powder is coated on the surface of the nodulizer by mixing with the nodulizer with completely stirring, or by using a binder, or by mixing with a binder to form slurry.