35 results about "Flux (metallurgy)" patented technology

The invention provides a cored wire for preparing an iron-based coating as well as a preparation method and application thereof and belongs to the field of thermal spraying in material processing engineering. The flux composition comprises 15-35 at.% of Cr, 5-25 at.% of B, 5-25 at.% of Si, 2.5 to 5.5 at.% of C and the balance of Fe; a strip material for a sheath of the cored wire is a stainless steel band; and the filling rate of the cored wire is 33%. When electric-arc spraying is used for preparing an iron-based amorphous / nanocrystal coating containing ceramic phase SiO2, firstly a matrix is pretreated, and according to a spraying technology, the voltage is 28-34V, the electric current is 160-220A, the spraying distance is 190-210mm, and the compressed air pressure is 0.4-0.6Mpa. The coating can be widely applied to repair and protection of equipment parts in industries such as metallurgy, electricity and petroleum. The coating with the advantages of corrosion resistance, high hardness and high wearing resistance is obtained according to the preparation method.

The invention relates to a method for comprehensively and efficiently treating zinc leaching residues, and belongs to the technical field of hydrometallurgy. The method comprises the following steps of 1) grinding of the zinc hydrometallurgy leaching residues; 2) first-stage pressure leaching; 3) second-stage pressure leaching; 4) slurrying washing of the leaching residues; 5) replacement copper precipitation; 6) pre-neutralization; and 7) neutralization indium precipitation. According to the method, efficient leaching of valuable metals such as zinc, indium, copper and silver and efficient synchronous precipitation of iron in the zinc hydrometallurgy leaching residues are achieved at the same time; the recovery rates of zinc, indium, copper and silver reach 98%, 88%, 96% and 99% or above respectively, and low-acid and low-iron leachate beneficial to selective separation of copper and indium is produced; and iron is enriched in lead-silver-iron slag together with lead and silver, iron in the lead-silver-iron slag can be used as a lead pyrometallurgy slagging flux and is finally stably solidified in furnace slag or kiln slag in the lead enrichment process, and the transformation from impurities to lead smelting raw materials is achieved.

The invention discloses a method for treating copper-molybdenum mixed ores, belonging to the field of molybdenum metallurgy. The method comprises the following steps: directly heating the copper-molybdenum mixed ores to a molten state, or heating to a molten by using an assistant flux copper matte (matte) (for high-molybdenum low-copper mixed concentrate) to form copper molybdenum matte; introducing air or oxygen-enriched air into the copper molybdenum matte to carry out converting until molybdenum sulfide in the copper molybdenum matte is oxidated into MoO3 to be volatilized, recycling the MoO3 from smoke dust by dust collection, and sending the dedusted flue gas to the acid making process; and after finishing converting, returning the low-molybdenum copper matte to the next matte formation process or sending the low-molybdenum copper matte to a copper smelting system. The method has the advantages of short process, favorable mass-transfer heat-transfer conditions, high productivity, high heat utilization, high SO2 concentration in flue gas, strong adaptability to raw materials, and the like.

The invention belongs to the field of non-ferrous metallurgy and relates to a method for preparing metallic aluminum or an aluminum-magnesium alloy by utilizing pulverized fuel ash. According to the technical scheme of the invention, the method comprises the following steps: preparing aluminum chloride by adopting acid leaching of pulverized fuel ash, wherein the adopted electrolyte system consists of a flux, a solute and an additive, and the flux comprises the following components in percentage by mass: 0-60 percent of NaCl, 25-75 percent of KCl and 0-66 percent of MgCl2; adding a solute AlCl3 which accounts for 5-50 percent of the mass of the flux, an additive LiCl which accounts for 0-5 percent of the mass of the flux, 0-5 percent of an additive KF, 0-5 percent of an additive MgF2 or 0-5 percent of an additive AlF3, wherein the solute AlCl3 is added from the bottom of the electrolytic cell, the interpolar voltage is controlled to be 2.3-3.3V, the cathode-current density is 0.5-1.5A / cm<2>, and the electrolysis temperature is 450-500 DEG C; and producing chlorine on one side of the anode in the electrolysis process, recycling chlorine, and depositing solid metallic aluminum or the aluminum-magnesium alloy on one side of the cathode. According to the method disclosed by the invention, the power consumption is saved, the electrolysis temperature is low, the production cost is low, the problems of aluminum chloride evaporation and generation of dendritic crystals during electrolysis are solved, the environmental pollution is avoided, and the equipment is easy to realize.

The invention discloses a green body, a sintered porous metal film and a dust removal method, and solves the technical problem that the sintered porous metal film with high strength and high gas flux is difficult to obtain in the prior art. The green body of the sintered porous metal film comprises a precursor layer, the precursor layer is provided with a first porous metal supporting layer and a coating attached to the surface of the first porous metal supporting layer, and the coating is provided with a metal powder raw material used for powder metallurgy; the reinforcing layer is provided with a second porous metal supporting layer, the strength and / or air flux of the second porous metal supporting layer are / is larger than those of the first porous metal supporting layer, and the reinforcing layer and the precursor layer are arranged in an overlapped mode.

The present invention discloses a method for controlling cracks at the corners of YQ450NQR1 B-shaped steel billets in the field of iron and steel metallurgy. Special mold flux for continuous casting mold. The physical properties of the flux are: viscosity 0.99~1.00Pa.S, alkalinity 0.81~0.83, softening temperature 1127~1130℃, hemispherization temperature 1194~1198℃, flow temperature 1201 ~1203℃, slag consumption 0.61~0.65kg / t during application 钢 . The invention optimizes the cooling of the corners of the slab and improves the uniformity control of the solidification evolution at the corners of the slab by using a tubular crystallizer with a large cross-section, and cooperates with the special mold slag to effectively protect the YQ450NQR1 B-shaped steel bloom The corner quality of the slab, especially the control effect on the defect width of the slab corner crack caused by the shrinkage of the peritectic transformation line is remarkable, which solves the problem of rolling cracks caused by the microcracks at the corner of the slab.

The invention relates to a magnesium-neodymium intermediate alloy and a preparation method thereof, and belongs to the technical field of metal materials and metallurgy. The magnesium-neodymium intermediate alloy comprises the following raw materials including, by weight, 10-15 parts of magnesium powder, 10-15 parts of neodymium powder and 0.1-0.15 part of a multi-element refining agent. The magnesium powder is added into a smelting furnace, a protective flux is added, slagging-off is conducted, the neodymium powder is added after slagging-off, the temperature is increased to 1050 DEG C after complete adding, the multi-element refining agent is added, the protective flux is added again after the temperature is increased to 1100 DEG C, secondary slagging-off is conducted, and a smelting material is prepared; brewing and boiling are carried out; ingot casting is carried out; testing is carried out; and carbon powder can serve as a pore-forming agent to decompose and release gas, on one hand, part of hydrogen in molten metal is taken away, on the other hand, nano-calcium-based powder is sintered at the temperature, a large number of porous structures are generated, the specific surface area of the nano-calcium-based powder is increased, the excellent adsorption performance is achieved, residual hydrogen and impurities in melt can be adsorbed, and the effects of refining and impurity removal are achieved.

The invention discloses a novel flux-cored silver solder, which belongs to a soldering material in the fields of metal materials and metallurgy. The novel flux-cored silver solder is prepared by coating soldering flux powder with a BAg18CuZnSn silver solder strip. And the BAg18CuZnSn silver solder strip is prepared from metal silver, copper, zinc and tin. The coating brazing flux powder is composed of potassium bifluoride (KHF2), potassium fluoride, boric acid, cesium carbonate, potassium carbonate, potassium silicate, sodium silicate, dipotassium hydrogen phosphate and potassium tetrafluoroborate (KBF4). Soldering flux powder in the flux-cored silver solder has excellent flowability and moisture absorption resistance, in the tape winding and drawing process of the flux-cored silver solder, the flux-cored silver solder does not have the phenomenon of wire breakage, the soldering flux powder cannot adhere to a roller, and the drawing diameter of the flux-cored silver solder can be reduced to 0.4 mm or below so as to meet the requirement for precise soldering.

The invention belongs to the field of the steel-making secondary refining ladle metallurgy, particularly relates to ladle furnace refining fluoride-free pre-melted slags, a preparation method and a using method and is suitable for the slagging refining process of the steel-making secondary refining in a steel ladle. The invention aims to provide the ladle furnace refining fluoride-free pre-melted slags, the preparation method and the using method by utilizing existing spodumene resources and adding a refining flux and a slag regulation component, solve the problems of defects of slag desulfurization, low dephosphorizing efficiency, large difficulty in rephosphorization control, poor slag melting performance, poor slag inclusion adsorption performance and the like of current ladle refining slagging materials, also reduce the ladle secondary refining slagging cost and implement the low-cost processing and utilization of a spodumene mineral. The ladle furnace refining fluoride-free pre-melted slags are characterized by being prepared from the following raw materials in percentage by weight: 40 to 60 percent of spodumene powder, 30 to 50 percent of lime powder and 5 to 25 percent of aluminium ash powder.

The invention relates to a method for producing compound filter of multi-layer metal meshes and metal powder, which comprises the steps of weaving metal wires to obtain metal meshes with different mesh numbers; laminating the metal meshes with different mesh numbers to obtain a laminated layer structure, wherein the mesh numbers of the laminated layers from one side to the other side increase continuously and the number of laminated layers is 2-6; then placing the laminated layer structure in a vacuum furnace and sintering at 1000-1600 DEG C to obtain a multiple support layers; then cooling and taking out of the support layers, manufacturing a metal compound layer of 100-600 meshes on one side of the support layer of high mesh by means of electrostatic spraying and curtain coating, controlling the thickness of the compound layer with 0.1-0.5mm and then sintering at 1000-1600 DEG C, cooling and taking out of the compound layer to obtain the compound filter of multi-layer metal meshes and metal powder. The compound filter has the advantages of low filtering resistance, large filter flux and strong bearing capacity and can be widely applied to industrial fields of chemical engineering, medicine, power generation,metallurgy, food and the like.

The invention relates to the technical field of non-ferrous metal metallurgy, in particular to a zinc-containing solid waste treatment method and system. The treatment method comprises the following steps that zinc-containing solid waste, a flux and a reducing agent are dried, the dried zinc-containing solid waste, the flux and the reducing agent are molten, so that first molten slag and first flue gas are obtained, the first slag is subjected to reduction smelting in a reducing atmosphere, so that second slag and zinc-containing flue gas, or metal alloy and zinc-containing flue gas, or sulfonium and zinc-containing flue gas is obtained, the zinc-containing flue gas is subjected to cooling or oxidation treatment, so that a zinc-containing product is obtained, and the zinc-containing product comprises any one of zinc powder, zinc liquid or zinc oxide. The zinc-containing solid waste treatment method is short in technological process, less in related matching, small in occupied area and low in investment cost, reduces the use of a reducing agent and fuel, and reduces carbon emission and environmental pollution.

The invention discloses a method for treating copper-molybdenum mixed ores, belonging to the field of molybdenum metallurgy. The method comprises the following steps: directly heating the copper-molybdenum mixed ores to a molten state, or heating to a molten by using an assistant flux copper matte (matte) (for high-molybdenum low-copper mixed concentrate) to form copper molybdenum matte; introducing air or oxygen-enriched air into the copper molybdenum matte to carry out converting until molybdenum sulfide in the copper molybdenum matte is oxidated into MoO3 to be volatilized, recycling the MoO3 from smoke dust by dust collection, and sending the dedusted flue gas to the acid making process; and after finishing converting, returning the low-molybdenum copper matte to the next matte formation process or sending the low-molybdenum copper matte to a copper smelting system. The method has the advantages of short process, favorable mass-transfer heat-transfer conditions, high productivity, high heat utilization, high SO2 concentration in flue gas, strong adaptability to raw materials, and the like.

The invention belongs to the technical field of metallurgy, and relates to a method for extracting a lead-bismuth alloy from copper anode slime smelting waste. The method includes the following stepsthat the copper anode slime smelting waste and a flux are mixed to be added into a Kaldo furnace for reduction smelting, a coarse lead-bismuth alloy is obtained by drossing after reduction smelting, and after the coarse lead-bismuth alloy melt is transferred to an intermediate frequency furnace, liguation decoppering, sulphurating denickeling and zincification silver separation are successively conducted to obtain the refined lead-bismuth alloy; and the flux includes coke, limestone and sodium carbonate, and the flux is prepared from the components in percentage by mass of the copper anode slime smelting waste: 5-6% of coke, 15-19% of limestone and 2-4% of sodium carbonate. According to the method for extracting the lead-bismuth alloy from the copper anode slime smelting waste, the obtained refined lead-bismuth alloy has high lead grade and few impurities, lead and bismuth can be recovered by direct lead electrolysis separation, gold and silver are recovered by furnace returning of silver-zinc crust, and efficient separation and recovery of lead, bismuth and gold and silver from the copper anode slime smelting waste are realized.

The invention belongs to the field of nonferrous metallurgy and relates to a method for preparing aluminum-magnesium alloys with fly ash. The technical solution of the present invention is to first adopt fly ash acid leaching to produce aluminum chloride, and then the electrolyte system used is composed of flux, melt and additives, wherein the composition of the flux is: NaCl: 0-60%, KCl : 25-75%, MgCl2: 0-66%, then add the melt AlCl3 that accounts for 5-50% of the flux quality, the additive LiCl, 0-5% additive KF, 0-5% additive that account for 0-5% of the flux quality MgF2 or 0-5% additive AlF3, in which molten AlCl3 is added from the bottom of the electrolytic cell, the inter-electrode voltage is controlled at 2.3-3.3V, the cathode current density is 0.5-1.5A / cm2, the electrolysis temperature is 450-500°C, during the electrolysis process Chlorine gas is generated on the anode side, which is recycled and reused, and solidified aluminum-magnesium alloy is deposited on the cathode side. The method of the invention has low power consumption, low electrolysis temperature, and low production cost, solves the problems of aluminum chloride evaporation and dendrite generation by electrolysis, has no environmental pollution, and is easy to implement.

The invention belongs to the technical field of nonferrous metallurgy, and provides an oxygen-enriched bottom blowing one-step copper smelting method. The method comprises the following steps: mixing copper concentrate, a flux and fuel, and carrying out melt chaotic stirring smelting by adopting oxygen-enriched variable-frequency bottom blowing; the gas of the oxygen-enriched variable-frequency bottom blowing is oxygen-enriched air; the flow of the oxygen-enriched air is a variable-frequency regulation flow; the variable-frequency regulation and control flow accords with a formula 1: in the formula 1, mu is equal to 4, xt is instantaneous flow, and xmax is maximum flow; the flow fluctuation of the oxygen-enriched air ranges from-20% to 20%. According to the method, oxygen-enriched variable-frequency bottom blowing is adopted for carrying out melt chaotic stirring smelting, generation of Fe3O4 can be reduced, the viscosity of smelting slag is reduced, and generation of foamed slag is reduced; meanwhile, oxygen-enriched variable-frequency bottom blowing achieves chaos stirring of the melt, enhances the heat and mass transfer effect in the smelting process, improves the smelting efficiency and prevents foaming slag from being generated.

The invention discloses a preparation method of a nano-W-xCu alloy and a nano-W-xCu alloy, belonging to the technical field of preparing composite materials by powder metallurgy. The method is to put copper tungstate and a certain amount of copper oxide into a high-pressure hydrothermal kettle for hydrothermal reaction, then cool the obtained hydrothermal product, filter and clean it, and finally dry it to obtain nano-sized tungsten copper. Precursor powder, followed by two-stage hydrogen reduction to obtain the final product nano-W‑xCu alloy powder. The method uses hydrothermal reaction to prepare tungsten-copper alloy powder, which has the advantages of high efficiency, low consumption, and easy operation. The prepared nano W-xCu alloy powder is spherical, the particle size reaches nanometer level, and the particles are fine and uniform. Tungsten copper is evenly distributed.

The invention relates to a Sn-Ag-Cu lead-free solder containing Nd, Se and Ga, and belongs to a brazing material in the fields of metal materials and metallurgy. The Sn-Ag-Cu lead-free solder comprises the following components in percentage by mass: 0.01 to 0.5 percent of Ag, 0.02 to 1.0 percent of Cu, 0.001 to 0.5 percent of Nd, 0.001 to 0.5 percent of Se, 0.003 to 1.5 percent of Ga and the balance of Sn. Noble metal silver which belongs to a strategic resource can be saved; silver content can be reduced to be ultralow, and the wettability of the solder can be improved; when the Sn-Ag-Cu lead-free solder is matched with a commercially available RMA brazing flux, the mechanical property of a brazing seam is 75 to 85MPa, and the tensile strength is 76 to 88MPa, so that the Sn-Ag-Cu lead-free solder can be suitable for wave soldering, reflow soldering and manual welding in electronic industry; and environment-friendly, lead-free and cadmium-free requirements in manufacturing industry can be met.