475 results about "Refining (metallurgy)" patented technology

The invention relates to a recovery method for an SCR waste flue gas denitration catalyst, and adopts a hydrometallurgy process. After the SCR waste flue gas denitration catalyst is smashed and subjected to pre-calcination treatment, a NaOH solution is added according to a ratio for dissolution. After the catalyst is dissolved, solid-liquid separation is performed, sulfuric acid is added into the obtained precipitation, and the precipitation is steeped, precipitated, hydrolyzed, subjected to salt treatment, and calcinated to obtain TiO2. Sulfuric acid is added into the solution obtained from the first solid-liquid separation to adjust the pH value, excess ammonium nitrate is added to precipitate vanadium, and second solid-liquid separation is performed. Ammonium metavanadate obtained from filtration is subjected to pre-calcination to obtain a V2O5 finished product. Hydrochloric acid is added into the solution obtained from the second solid-liquid separation to adjust the pH value, and NaCl is added to obtain sodium tungstate. The sodium tungstate is subjected to purification, filtration, ion exchange, and other processes to separate impurities, and subjected to evaporative crystallization to obtain a sodium tungstate finished product. The method provided by the invention is simple in technology, general in equipment, easily available in raw material, low in cost and high in recovery rate.

The invention provides a mold steel electroslag re-melting slag system and a use method of the mold steel electroslag re-melting slag system and belongs to the technical field of metallurgy engineering refining. The slag system consists of the following ingredients in percentage by mass: 65 to 70 percent of CaF2, 20 to 25 percent of Al2O3, 5 to 10 percent of SiO2 and 5 to 10 percent of MgO. A slag required by the refining is prepared according to the mass percentage being 4 to 6 percent of the mass of a mold steel electrode ingot to be refined. The use method comprises the following process steps of preparation and baking of electroslag re-melting slag, preparation of re-melting self consumption electrodes, arc smelting of electroslag re-melting, normal smelting of electroslag re-melting, smelting later-period feeding filling, electroslag steel ingot slow cooling heat insulation and electroslag re-melting steel ingot demolding. After the electroslag ingot heat insulation is completed, the demolding is immediately converted into the subsequent nodulizing annealing treatment. When the system and the method provided by the invention are adopted for refining, the sulfur and phosphor contents in mold steel are further reduced, in addition, the contents of active elements such as C, Si and Mn in the steel do not basically generate burnt loss, and the quality of the mold steel electroslag re-melting steel ingot is further improved.

The invention belongs to the field of metallurgy, and particularly relates to a method for directly smelting copper-bearing antibacterial stainless steel by utilizing copper slag for reducing molten iron. According to the method, high-temperature molten-state copper slag is directly transferred and injected into a high-temperature reduction furnace, oxygen is sprayed and blown into the furnace to perform oxidation impurity removing pretreatment on the molten copper slag, then, slagging constituents are added in the furnace, inert gas and natural gas are sprayed and blown into the furnace for smelting reduction to obtain copper-bearing molten iron, the copper-bearing molten iron is conveyed to the steelmaking process, copper-bearing mother steel liquor is obtained, continuous casting is performed on the molten steel mother liquor obtained by refining to obtain a steel billet, hot rolling and annealing treatment are performed on the steel billet, and the antibacterial stainless steel is obtained. According to the method, the production cost of the antibacterial stainless steel is greatly reduced, and meanwhile the comprehensive utilization added value of valuable elements of the copper slag is greatly improved.

The invention relates to a rare earth extraction saponification waste-water cyclic utilization method, belonging to the rare earth wet-process metallurgy field. The method comprises the following steps: concentrating the saponification waste water after adding crude salt, adding Na2SO3, BaCl2, Na2CO3 and removing impurities through a water distribution tank, refining the filtered secondary salt water by an ion exchange resin tower, Ca2+, Mg2+ ion <=20ppb; producing hydrochloric acid and liquid alkali using ion membrane electrolytic process wherein the hydrochloric acid and liquid alkali back to the rare earth technique. The treatment of the sodium chloride waste water realizes the cyclic utilization of the valuable element with features of source saving, product cost reducing, environmental pollution reducing. The method is an economic and an environmental friendly production method of rare earth extraction separation cyclic utilization, which realizes the cyclic utilization of the rare earth extraction separation sodium chloride saponification waste-water.

The invention discloses a production method of ultra-thin specification hot rolling punching steel with the tensile strength of 390-510 MPa, and belongs to the technical field of metallurgy panels. The production method comprises the following steps of converter smelting, LF furnace refining, continuous casting, heating furnace heating, high-pressure water descaling before rough rolling, two-rack rough rolling, high-pressure water descaling before fine rolling, five-rack fine rolling, laminar cooling and coiling. By means of the component design and reasonable heating, rolling and cooling technology of a low-carbon and low-manganese V microalloying system, the rolling difficulty is lowered, cold-formed ultra-thin hot rolling punching steel strips good in welding performance are produced, and the improvement of the product profit space and the popularization of the ultra-thin hot rolling punching steel strips are facilitated.

The invention belongs to a steel-making process in the metallurgy field and relates to a process for preventing silicon increase in the smelting process of low-silicon steel and stably controlling silicon content at an end point of molten steel. By means of accurate ingredient and temperature control at a blowing end point of converter, steel-tapping deoxidization alloying and remaining oxygen operation, temperature rise of oxidizing slag at an earlier stage of a refining furnace and optimization of a slagging process in deoxidization desulfuration procedures, molten steel increase (Si) in the whole smelting process is smaller than 0.02%, the ingredient control at a smelting end point is stable and accurate, surfaces of casting blank and inside quality are excellent, the substandard rate of the casting blanks is reduced, and the economic profit is improved.

The invention discloses a corrosion-resistant high-strength pearlite steel rail and a preparation method thereof, and belongs to the technical field of metallurgy. The steel rail comprises the following chemical components of, in percentage by mass, 0.65%-0.80% of C, 0.45%-0.85% of Si, 1.0%-1.5% of Mn, less than or equal to 0.020% of P, less than or equal to 0.020% of S, 0.68%-0.95% of Cr, 0.03%-0.06% of Nb, 0.8%-1.6% of Cu, 0.002%-0.006% of B, the balance Fe and unavoidable impurities. The steel rail is prepared through the processes of molten iron pretreatment, converter smelting, refining,vacuum treatment, continuous casting, rolling, online heat treatment and the like. According to the the steel rail designed by the preparation method, the room-temperature structure is fine lamellar pearlite and a small amount of ferrite, the lamellar spacing of the pearlite is 90-120nm, the tensile strength Rm is 1280-1350 MPa, the elongation A is 11%-13%, the tread hardness is 360-390 HB, and the room-temperature impact energy AKU is greater than 20 J.

The invention discloses low-temperature-resistant hot-rolled angle steel and a production method thereof, and belongs to the technical field of metallurgy. The angle steel consists of the following chemical components in percentage by mass: 0.10-0.15% of C, 0.20-0.50% of Si, 1.3-1.7% of Mn, 0.04-0.06% of V, 0.005-0.015% of Al, less than or equal to 0.01% of N, less than or equal to 0.006% of O, less than or equal to 0.020% of P, less than or equal to 0.010% of S and the balance Fe and inevitable impurities. The production method for the low-temperature-resistant hot-rolled angle steel comprises the following steps: molten iron pre-desulfurization, converter smelting, LF refining, and a continuous-casting and rolling process by a billet continuous casting machine, wherein sulfur content of the molten iron after desulfurization is less than or equal to 0.005wt%. According to the low-temperature-resistant hot-rolled angle steel and the production method thereof, a vanadium micro-alloying process and a steelmaking process are adopted, the control is simple and the alloy recovery rate is stable. The low-temperature-resistant hot-rolled angle steel is good in performance, and has impact energy greater than or equal to 100J at a temperature of (-)40 DEG C.

The invention belongs to the field of metallurgy and discloses spring steel round steel and a production process thereof. The spring steel round steel comprises the following components in percentage by weight: 0.56 to 0.64 percent of carbon (C), 1.60 to 2.00 percent of silicon (Si), 0.70 to 1.00 percent of manganese (Mn), less than or equal to 0.025 percent of phosphorus (P), less than or equal to 0.025 percent of sulfur (S), 0.15 to 0.35 percent of chromium (Cr), less than or equal to 0.35 percent of nickel (Ni), less than or equal to 0.25 percent of copper (Cu) and the balance of Ferrum (Fe). The production process comprises the following steps of: converter or electric furnace smelting, LF refining, VD degassing, CCM continuous casting and bar rolling. The spring steel round steel of the invention has the characteristics of low alloying element content, low decarburizing tendency, high temper resistance, high hot-working performance, low cost, high performance after heat processing and the like of a common round steel; besides, the spring steel round steel simultaneously has high cold workability under the condition of air cooling after rolling. The process ensures that the rolled spring steel round steel obtains a texture of pearlite and a small number of ferrolites under the condition of air cooling, and has high plasticity and toughness during cold working, and every performance can meet the requirements of GB/T1222 after heat processing.

The invention discloses an energy-saving and efficiency-improving composite reagent for limestone gypsum desulfurization. The composite reagent is characterized in that the composite reagent is powdered solid formed by mixing 10-70% (wt%) of cosolvent, 1-40% (wt%) of pro-oxidant, 10-35% (wt%) of absorbent and 1-15% (wt%) of regulator at a room temperature. The addition amount of the energy-saving and efficiency-improving composite reagent is 300-1300mg/L. The composite reagent is simple to prepare and flexible in formula, and the corresponding energy-saving and efficiency-improving composite reagent can be prepared under different operating conditions. The energy-saving and efficiency-improving composite reagent for the limestone gypsum desulfurization has the characteristics of high efficiency-improving speed, wide efficiency-improving range, no secondary pollution and low cost, and has scale inhibition, defoaming and corrosion inhibition performances. The composite reagent can be used in a limestone gypsum desulfurization system in the fields of power, refining and chemical, metallurgy and the like, can reduce the energy consumption, and can obtain high desulfurization efficiency.

The invention relates to a device and a method for removing copper in crude lead pyro-refining in nonferrous metallurgy field, and in particular relates to a device and a method for continuously removing copper from liquid crude lead. The device comprises a pot body and a smoke hood which is covered on the pot body, wherein a stirrer, the stirring paddle of which extends to the liquid lead in the pot body, is fixedly arranged on the smoke hood; the pot body is divided into a stirring reaction region and a cooling liguation region by a baffle plate; the liquid lead and copper dross overflow to the upper part of the cooling liguation region from the stirring reaction region through the upper side of the baffle plate; a charging hole is arranged at the end part of the smoke hood on the stirring reaction region; a drossing hole and a lead discharging hole are arranged at the end part of the cooling liguation region; a smoke outlet is arranged at the end part of the smoke hood above the cooling liguation region; dross stirrers for stirring the copper dross floating on the liquid lead are fixedly arranged on the two side surfaces of the cooling liguation region; cooling water tubes for cooling the liquid lead are welded on the two sides of the pot; a siphon lead discharging tube is arranged on the pot side at the lead discharging hole; and the lower hole of the siphon lead discharging tube extends to the bottom of the pot body. According to the device and the method provided by the invention, energy is saved, environment-friendly effect is good, recovery rate of lead is high, automation degree is high, and labor intensity is low.

The invention relates to a technology for smelting an ER70S-6 welding wire steel through utilizing vanadium-containing molten iron, which belongs to the technical field of metallurgy. The technical scheme is as follows: the vanadium-containing molten iron is taken as a raw material for converter vanadium extracting, semisteel refining, ladle furnace (LF) refining, continuous casting and steel rolling. The technology has the beneficial effects that the vanadium in the vanadium-containing molten iron is fully used, the chemical ingredients of the ER70S-6 welding wire steel are redesigned, a deoxidation technology is optimized, is a refining process mixed with less Al2O3 and only uses ferrosilicon powder for diffusible desoxydation, any material which contains Ca is not added during the whole smelting process, so that sparks are reduced during a welding process; and a certain amount of residual vanadium is controlled to exist in the welding wire steel, double functions of grain refining and precipitation strengthening of the vanadium in the steel are played, and the steel strength and the steel toughness are improved.

The invention relates to a high-strength and high-corrosion-resistance cupronickel alloy and a manufacturing method thereof. The high-strength and high-corrosion-resistance cupronickel alloy is characterized by comprising cathode copper and electrolytic nickel as main components, less zirconium sponge and metallic silicon powder, and less than or equal to 2.0% of impurities. According to the manufacturing method provided by the invention, a soft alloy end-product is formed by performing the steps of electrically smelting, refining, condensing and crusting, casting and molding, in a vacuum induction furnace, and the like. The high-strength and high-corrosion-resistance cupronickel alloy has high strength and high corrosion resistance, 670-770 MPa tensile strength and 38-45% extension property, so that the property is 40% higher than B19 property, the corrosion resistance is increased by 3 times and the machining property is excellent. The high-strength and high-corrosion-resistance cupronickel alloy has the characteristics of wide application, long service life and the like, and can be used for producing plates, belts, pipes, bars, lines and forging pieces. The high-strength and high-corrosion-resistance cupronickel alloy is widely applied to the industries, such as shipbuilding, chemical industry, manufacturing and metallurgy. The manufacturing method provided by the invention also has the advantages of simple steps of the cupronickel alloy processing technology, low processing cost, easiness in production, and meeting the demands of various application fields on the high-strength and high-corrosion-resistance cupronickel alloy.

A comprehensive iron-aluminium paragenetic mineral utilization method belongs to the technical field of metallurgy. The comprehensive iron-aluminium paragenetic mineral utilization method is carried out according to the following steps: iron-aluminium paragenetic mineral is ground and made into pellets, and reducing gas is filled to pre-reduce the pellets, so that pre-reduced mineral is obtained;the pre-reduced mineral and lime are put into a reduction and melting furnace, and with oxygen as carrier gas, pulverized coal is jetted to carry out melting and reduction, so that molten iron and high-temperature aluminium-containing molten slag are obtained; the high-temperature aluminium-containing molten slag is cooled to normal temperature and naturally powdered, so that slag is obtained, and the slag is put into sodium carbonate solution and leached, so that leachate and leaching residue are obtained; the leachate is desiliconized under normal pressure and desiliconized under medium pressure, so that refined liquor is obtained; CO2 is filled into the refined liquor to carry out carbonation decomposition, so that decomposed mother liquor and aluminium hydroxide are obtained, and the aluminium hydroxide is roasted, so that alumina is produced; sodium carbonate is added into the decomposed mother liquor to replenish alkali, and the produced sodium carbonate solution is used for leaching. The comprehensive iron-aluminium paragenetic mineral utilization method not only can guarantee the high-efficiency dissociation and extraction of iron and aluminium, but also is feasible technically and economically, and the iron-aluminium paragenetic mineral resource in China is effectively and comprehensively utilized.

The invention discloses a method for preparing a CuCr alloy ingot through aluminothermic reduction-slag refining, and belongs to the technical field of metallurgy. The method comprises the following steps: (1) CuO powder, Cr2O3 powder and Al powder are prepared to obtain a mixed material; a slag forming agent is added into the mixed material, and a product obtained from the last step is put in a reactor; metal magnesium powder is put on; the ignition is performed by using open fire under the effect of an electromagnetic field; and a high-temperature melt is obtained; (2) the alloy slag smelting separation is performed under the effect of the electromagnetic field; the reduction smelting slag is discharged 30-50% of the total quantity; and a smelting high-temperature melt is obtained; (3) premelting slag is added for refining and removing impurities under the effect of the electromagnetic field; deoxidizing agent and copper powder are injected in a bottom blowing and powder injecting manner; and refining slag is removed to obtain a refined alloy melt; and (4) the forced water cooling is performed until the refined alloy melt is cooled to the room temperature; the slag is removed; and the ingot is drawn. The method not only can prepare the copper-chrome alloy ingot with large size, homogeneity and compactness, but also can prepare copper-chrome alloys in such series as CuCr5-CuCr70; all operations are performed in the atmosphere, and are simple; and the requirements on process conditions are low.

The invention relates to fiber-reinforced refractory bricks and a preparation method thereof, and belongs to the technical field of refractory materials for ferrous metallurgy. The fiber-reinforced refractory bricks comprise the following components in parts by weight: 70-90 parts of magnesium oxide and/or aluminum oxide, 1-4 parts of silicon carbide, 0.5-10 parts of graphite, 0.3-1 part of aluminum, 0.2-10 parts of refractory fibers and 1-8 parts of a binder. The refractory bricks are capable of solving problems in the prior art perferably that the strength, heat resistance, peeling resistance and erosion resistance of the existing refractory bricks cannot be taken into consideration at the same time; the cost is moderate; and the fiber-reinforced refractory bricks are especially suitableto be taken as furnace linings of electric furnaces, converters and refining furnaces in the metallurgical industry and flow steel bricks for casting.

The invention discloses a preparation method of a graphitizing hot rolled steel plate, which belongs to the technical field of metallurgy. The method mainly comprises the steps of steelmaking, refining, continuous casting, heating, hot continuous rolling, laminar cooling, coiling, steel coil spreading and air cooling, leveling and rolling, graphitizing annealing and the like. In order to increase the graphitizing rate and promote a graphitizing process, a pulsed magnet field is applied in a graphitizing annealing process, the magnetic field intensity is 10000 to 30000 A/m, and the magnetic field frequency is 20 to 100 Hz. Within the graphitizing time of 3 to 6 hours, the graphitizing rate can reach more than 90%, the diameter of graphite is 3 to 6 mum, the graphite is spherical or nearly spherical and is uniformly distributed, and the diameter range of ferrite grains is 20 to 30 mum. According to the structural features, the steel plate, especially the steel plate with high carbon content, has low hardness and high plasticity, therefore, the steel plate has good stamping and forming performance, and the preparation method is favorable for enlarging the application range of medium and high carbon steel plates in a stamping and forming process of components and parts in complex shapes.

Belonging to the technical field of metallurgy, the invention relates to a 500Mpa grade tough weather-resistant bridge steel., which comprises the following chemical components by mass percentage: 0.04-0.06 of C, 0.25-0.35 of Si, 1.20-1.30 of Mn, 0.4-0.5 of Cr, 0.30-0.40 of Ni, 0.27-0.37 of Cu, 0.2-0.7 of Mo, less than 0.015 of P, less than 0.006 of S, 0.020-0.030 of Nb, 0.015-0.025 of V, 0.007-0.017 of Ti, 0.015-0.040 of Al and the balance Fe and inevitable impurities. The preparation method includes: smelting into molten iron, refining, vacuum treatment, protective continuous casting and thermal mechanical rolling. A multi-phase composite structure of acicular ferrite, bainite ferrite and M-A components is obtained through component and process design, and good matching of high strength,high toughness, weather resistance and weldability is achieved.

The invention relates to a synthetic slag in the metallurgy field, in particular to a low-basicity synthetic slag for external refining. The low-basicity synthetic slag for external refining consists of the following components according to weight percentage: 30 to 40 percent of CaO, 35 to 45 percent of SiO, lower than or equal to 5 percent of Al2O3, 8 to 15 percent of MgO, 6 to 15 percent of CaF2, lower than or equal to 2 percent of FeO, the rest of the components is unavoidable impurities, and the sum of all the components is 100 percent. Due to the low-basicity synthetic slag for external refining disclosed by the invention, steel ladles can be effectively inhibited from corrosion while the impurities are plasticized, the control levels of the impurities of the manufactured spring steels and core thread wire rods steel are good, the cold drawing property is excellent, the widths of the impurities of the wire rods are stabilized below 10um, and most of the widths of the impurities of the wire rods are less than 5um.

The invention relates to an environment-friendly leadless free-cutting steel which comprise the following components by weight percent: 0.04 to 0.15 % of C, 0.95 to 1.40 % of Mn, 0.04 to 0.09 % of P. 0.25 to 0.45 % of S, less than or equal to 0.03 % of Si, 0.025 to 0.25 % of Bi, 0.10 to 0.35 % of Ca, less than or equal to 0.03 % of As, less than or equal to 0.03 % of Cu, less than or equal to 0.03 % of Cr, less than or equal to 0.03 % of Ni, less than or equal to 0.03 % of Mo, less than or equal to 0.03 % of Al and the balance being Fe. A metallurgy method of the environment-friendly leadless free-cutting steel comprises smelting by using a converter or an electric furnace firstly and a refining furnace secondly, and then continuously casting or molding into blanks, wherein nano-graphite accounting for 0.008 to 0.015 % of a total weight of molten steel is added during a smelting process in the refining furnace, so that 0.008 to 0.015 % of nano-solid C is contained in the product. By adding bismuth with a melting point less than that of the lead and carbon materials with excellent lubricating effect, lubrication effect on cutting tools is relatively good during a metallic material machining process, being nontoxic and harmless as well; and the method has advantages of simple process, strong operationality and low production cost.

The invention belongs to the technical field of ferrous metallurgy and particularly relates to ultra-low aluminum steel and a smelting method thereof. The smelting method provided by the invention adopts a production route with the steps of deep removal of S and P by molten iron pretreatment, decarbonization by a converter, deoxidization and alloying of silicon manganese during tapping, deslagging by argon blowing, deep removal of O, S and P by ladle refining, micro-alloying of Ti, Ni, Mo, V and other elements, RH (Ruhstahl-Hausen) vacuum circulation degassing, soft argon blowing and full-protection casting; the prepared ultra-low aluminum steel has low content of harmful elements, particularly has low content of O and Al, can prevent the inclusion of brittle aluminum oxide and realize high impact-resistant and fatigue-resistant performances of the steel, and is suitable for application fields with relatively high requirements for fatigue and impact performances, such as high-speed track traffic and the like.

The invention relates to a method for casting and dealuminizing ferrovanadium by an electro-aluminothermic process, belongs to the field of metallurgy, and aims to solve the technical problem of providing the method for casing and dealuminizing ferrovanadium by the electro-aluminothermic process. The method comprises the steps of reducing, refining and casting, wherein existing technical methods are adopted in the reducing and refining steps; before alloy liquid is cast, a mixture composed of ferric oxide and lime is put into an ingot module, and then is cast and cooled to obtain ferrovanadium; the mass ratio of ferric oxide to lime in the mixture of ferric oxide and lime is (2-3) to 1. The method for casting and dealuminizing ferrovanadium by the electro-aluminothermic process is simple in steps and strong in operability; and the content of aluminum in the produced ferrovanadium is less than 0.2wt%. The method has the advantages that the dealuminzation efficiency is high, the smelting time for dealuminization in a furnace can be shortened, and the like.