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2617 results about "Smelting process" patented technology

The process of smelting uses both heat and a chemical reduction agent. This process changes the oxidation state of the ore. One of the forms of extracting metals is smelting. The purpose of the smelting process is to produce a metal from its original ore.

Method for harmless disposal and recycling of aluminum ash

ActiveCN105271327ATo achieve the purpose of comprehensive recycling of resourcesGreat social valueAmmonia preparation/separationAluminium oxides/hydroxidesMetallic aluminumSodium aluminate
The invention discloses a method for harmless disposal and recycling of aluminum ash. The method comprises steps of raw material water immersion nitrogen and chlorine removal, calcination fluorine removal, alkali fusion sintering, sintering material dissolving-out and purifying impurity removal. Aluminum ash generated in metal aluminum smelting process is employed as a raw material, after metal aluminum is recycled through secondary processing, nitrides are removed through water immersion, fluorides are removed through calcinations, alkali fusion sintering is carried out, the sintering materials are dissolved out, impurities are removed through a sodium aluminate solution, the processed aluminum ash is employed as a raw material for producing sand-shaped aluminum oxide. Ammonia gas generated in the aluminum ash harmless disposal process can be employed as an ammonium production raw material, a chlorination liquid generated can be employed as a chlorate production raw material, and silicon fluoride gas generated in the calcination process is absorbed by an aqueous solution. The method is simple and practical, environmental protection benefits are high, the production efficiency is high, the device investment is low, and energy consumption is low. Harmless and recycling disposal of hazardous wastes can be achieved. The obtained product can be applied in practical production.

Method for melting nickel-base high temperature alloy with electro-slag furnace

InactiveCN102719683AReduce the degree of segregationImprove hot workabilityAl powderSlag (welding)
The invention relates to a method for melting a nickel-base high temperature alloy with an electro-slag furnace. The method includes the following methods: loading materials, welding a high temperature alloy electrode and a false electrode to be smelted together, and placing slag materials at the bottom of a crystallizer; blowing the welded electrodes with inert gases, and closing a protection cover; protecting a smelting closing smoke exhaust valve, and feeding an Ar gas into the crystallizer and the protection cover; striking an arc and melting slag; cleaning smelting slag materials, starting a smelting period, and swinging a slag resistor for less than 0.5 m omega during the smelting process; adding oxidizing agents, and adding metal aluminum powder continuously or at intervals to serve as deoxidizing agents during an electro-slag re-melting process; adopting feeding thorough three stages, power feeding is decreased rapidly, power feeding is decreased slowly, and finally heat is preserved at constant power; and casting a die, cooling and demolding the die. According to the method for melting the nickel-base high temperature alloy with the electro-slag furnace, the surface of a nickel-base high temperature steel ingot has no slag groove defect, and the burning losses of Al and Ti are less than or equal to 5%.

Method for separating vanadium-titanium magnetite to extract iron, vanadium and titanium

InactiveCN102179292AHigh technical difficultyIncrease processing costWet separationSmelting processMagnetite
The invention discloses a method for separating vanadium-titanium magnetite to extract iron, vanadium and titanium, comprising the following steps of: magnetically selecting raw magnetite, that is, acquiring iron-vanadium concentrate and tail magnetite after performing magnetic selection on the vanadium-titanium magnetite; sorting titanium concentrate from the tail magnetite, that is, acquiring the titanium concentrate after performing floating selection on the obtained tail magnetite; roasting and magnetically selecting the titanium concentrate, that is, performing enriched-titanium impurity-removing magnetic selection after roasting the titanium concentrate; finely selecting the iron-vanadium concentrate, that is, performing the magnetic selection and fine section again on the iron-vanadium concentrate obtained from magnetic selection; reducing and smelting, that is, mixing the titanium concentrate obtained from the impurity-removing process with the iron concentrate according to the beneficiation yield, adding in a reducer and soda ash to perform reduced iron and vanadium smelting process; purifying vanadium slag, that is, removing the impurity of the vanadium slag obtained by reducing and smelting by using the acidic dipping to obtain the high-quality titanium slag product with the content of TiO2 larger than 92%; and extracting vanadium from pig iron, that is, performing vanadium extraction by converter blowing on the vanadium-containing pig iron obtained by reducing and smelting to obtain the semi-steel and vanadium slag. The method not only improves the utilization ratio of titanium, iron and vanadium but also obtains the high-titanium slag product with the content of TiO2 larger than 92% so as to widen the application field of titanium.

Dephosphorization method of semi-steel

InactiveCN102220453AReduce manufacturing costGood dephosphorization effectSmelting processNitrogen
The invention provides a dephosphorization method of semi-steel. The method comprises the following steps: adopting a six-hole oxygen gun to perform sectional smelting through a way of adjusting the oxygen supply strength of the oxygen gun, namely first dephosphorization smelting, adding a first batch of slag-making materials, controlling the oxygen supply strength of a top-blowing oxygen gun at 2.83-3.21Nm3/(t steel. min), simultaneously bottom-blowing nitrogen, smelting and deslagging; performing second dephosphorization smelting, adding a second batch of the slag-making materials, controlling the oxygen supply strength of the top-blowing oxygen gun at 3.58-4.07Nm3/(t steel. min), bottom-blowing the nitrogen during the time period from the beginning of the second dephosphorization smelting to carbon catching, bottom-blowing argon during the time period from the carbon catching to the terminal point of converting, smelting, stopping slag, tapping for getting molten steel with the content of a phosphorus element, which is not more than 0.008% by weight percentage, and performing the operation of remaining the slag after the tapping. By adopting the method, the dephosphorization effect is good, the dephosphorization efficiency is high, the smooth operation of the smelting process of a converter can be ensured, the steel-making production cost can be reduced and the semi-steel can be adopted for producing low-phosphorus steel with high grade and high added value.

Smelting method for improving phosphorus removal rate of converter

ActiveCN103060508ALower oxygen pressureFoamy splash preventionManufacturing convertersSmelting processOxygen pressure
The invention discloses a smelting method for improving the phosphorus removal rate of a converter. The method comprises the following steps of: at the later stage when steel splashing slag is emptied in the converter, adding 500 to 800 kilograms of lime, slightly stirring, pre-heating, adding waste steel, and blending molten iron; adding a bath of slag forming material such as lime, lightly burnt magnesium blocks, ores and the like when blowing to 45 to 60 seconds, lifting an oxygen lance by 200 millimeters when blowing for 4.5 minutes, continuously adding 4 to 5 batches of ores, and uniformly controlling the heating speed of a molten pool to increase the FeO content of slag; when blowing to 7 minutes, properly lowering the lance for 50 to 100 millimeters, meanwhile, reducing the oxygen pressure to 0.80MPa, and continuously adding 2 to 3 batches of rest lime; and keeping the position of the final point pressure lance at 1,000 millimeters for 1 minute. By adopting the method, full-process slag smelting can be realized, the slag is not re-dried, a good phosphorus removal effect is obtained, the phosphorus removal rate is improved by 10 percent compared with the conventional smelting process, and the requirement for smelting the molten iron with a high content of phosphorus can be met.

Solid lubricating high-temperature anti-wearing powder composition and preparation method of compound coating of composition

InactiveCN102836996ASignificant progressImprove high temperature wear resistance and friction reduction performanceLiquid/solution decomposition chemical coatingDecompositionEvaporation
The invention relates to a solid lubricating high-temperature anti-wearing powder composition and a preparation method of a compound coating of the composition. The powder composition comprises the following components in percentage by mass: 14-17.5% of nickel, 3-3.5% of chromium, 49-52.5% of chromium carbide and 25-30% of tungsten disulfide with a surface coated by an alloy-phosphorus alloy. A solid self-lubricating high-temperature anti-wearing compound coating is prepared by the powder composition through utilizing a laser smelting technology. According to the invention, NiCr-Cr3C2 compound powder is used as a metal substrate and the compound coating is formed by a ceramic anti-wearing phase and a metal toughening phase; WS2 is a solid lubricating phase and one layer of a micron-grade Ni-P alloy is coated on the surface of a WS2 powder grain by utilizing a chemical plating method, so that the thermal stability and the chemical stability of WS2 are increased, the decomposition and evaporation of the WS2 in a laser smelting process are effectively inhibited and the compatibility of the WS2 and the metal substrate is increased; and the compound material coating has the characteristic of high-temperature self-lubricating wearing resistance.

Smelting process of high-carbon bearing steel

ActiveCN104087719AGood deoxygenationImprove responseAlkalinitySmelting process
The invention discloses a smelting process of high-carbon bearing steel. High-alkalinity refining slag with the alkalinity value of 6-9 is obtained through adding conditioned slag and a deoxidizing agent, so that relatively good desulfuration and deoxidization effects are achieved, the content of S can be reduced to about 0.002%, and the content of O can be reduced to be less than 7ppm. Meanwhile, in order to avoid brittle impurity generation caused by overhigh alkalinity of refining slag, the content Al of the molten steel is strictly controlled in a smelting process, enough aluminum blocks for deoxidizing are added at one step in a tapping process, and no aluminum is replenished in the subsequent process, so that a deoxidized product is prevented from being floated; the content of Al in the refining slag is controlled at about 0.010%, so that secondary oxidation caused in a pouring process is reduced. On the other hand, the value of CaO/Al2O3 in the refining slag is controlled at about 1.7, so that the melting point of slag is relatively low, the flowability of the slag is relatively good, the steel slag is easy to separate, and the slag rolling and reduction reaction of molten steel in a vacuumizing process are reduced. Therefore, D-type inclusions in the bearing steel are effectively prevented from being increased, and the rating standards of inclusions in the bearing steel are reached.

Smelting process for production of super-low sulphur steel

InactiveCN102534120AStable controlFast and stable controlManufacturing convertersSteelmakingAlkalinity
A smelting process for the production of super-low sulphur steel belongs to the technical field of steelmaking, and adopts the process route of molten iron magnesium jetting desulfuration pretreatment-converter smelting-ladle dusting-LF Furnace refining-RH refining-continuous casting. The smelting process is characterized in that the molten iron pretreatment adopts magnesium particle jetting for desulfuration; the converter smelting adopts high-grade steel scrap and lime; during tapping, ferro-aluminum is used for strong deoxygenation and slag surface deoxygenation is conducted; the ladle dusting is used for controlling reasonable jetting speed and dust consumption; the LF Furnace refining is used for controlling the feeding quantity of high-alkalinity refining slag and the bottom jetting flow rate of a ladle; and after refining, the oxidizing property and the alkalinity of steel slag are guaranteed. The invention has the advantages that super-low sulphur steel making can be realized fast on the condition that the sulphur content at the end point of the converter cannot be controlled stably; the dusting desulfuration jetting of the ladle lasts for 10 to 15 min; the desulfuration during the LF Furnace refining lasts for 15 to 30 min; the content of sulphur in steel can be controlled within 0.0010 percent fast and stably; and the batch stable control of super-low sulphur steel can be realized.

Copper smelting device and process

InactiveCN102181661AAchieve positive resultsReduce bad luckRotary drum furnacesCrucible furnacesBrickSmelting process
The invention provides a copper smelting device and a copper smelting process. In the device, a shell of a rotary horizontal type cylindrical furnace body is made of a steel plate; an inner liner is made of a refractory material; the furnace body passes through two supporting rings and is supported on a foundation through four supporting rollers; one side of the furnace body is provided with a transmission mechanism; a motor is used for driving a speed reducer to drive the furnace body to rotate along a central shaft through a gear and a gear ring on a cylinder; the furnace body is partitioned into a smelting area, a blowing area and a refining area by a refractory brick retaining wall; a gap is formed at the bottom of the retaining wall; the bottoms of all areas are provided with a spray gun respectively; a charging hole is formed above the smelting area; a flue hole and a fluxing agent hole are formed above the blowing area; a main burner nozzle and an auxiliary burner nozzle are arranged on the shell of the furnace body end close to the two sides of the smelting area and the refining area respectively; and a slagging hole and a copper discharging hole are formed on the shell of the furnace body end on one side of the auxiliary burner nozzle. The device has a simple structure, a reasonable design and extremely good popularization value and application value and is energy-saving and environment-friendly.

Whole process dynamic monitoring method for converter steel melting

The invention pertaining to the field of metallurgy and steel-making technology provides a convertor steelmaking whole-course dynamic monitoring method. The whole-course dynamic control of the convertor steelmaking can be realized by adopting a laser gas analyzer and a stock bin port bombing technology, molten steel component and temperature are forecasted continuously and detected dynamically, and the convertor is assisted to perform the end point judgment. The method comprises steps of using a network of computer to monitor the information of charging, jetting and the like; using the laser gas analyzer as the gas signal acquiring and analyzing device in the convertor smelting process; using the bombing device installed at the stock bin port to performing head ejecting to detect information of molten steel component, temperature and the like; acquired parameters are all transferred through the network of computer; the computer continuously forecasts the parameters of molten steel component, temperature and the like by utilizing the above parameters and a built-in control model, and displays the parameters and provides guidance on the user interface.The invention has advantages that the whole-course feedback signals can be obtained, a whole-course dynamic control of the convertor smelting can be realized, variation of temperature and molten steel component can be forecasted continuously, the size of the convertor capability is not limited, and the convertor has characteristics of simple structure, convenient maintenance, small investment and low rate of fault.

High-boron high-speed steel roller material and smelting process thereof

The invention provides a high-boron high-speed steel roller material and a smelting process thereof. The smelting process of the high-boron high-speed steel roller material comprises the following steps: firstly, adopting Q235 waste steel, ferrotungsten, ferromolybdenum, ferrovanadium, high carbon ferro-chrome, metal copper, metal aluminum, calcium-silicon alloy, rare earth ferrosilicon magnesium alloy, ferrocolumbium, ferroboron, ferrosilicon, vanadium-nitrogen alloy, zirconium ferrosilicon and ferrotitanium as materials for smelting low-alloy high-speed molten steel in an electric furnace; then, adding the ferrovanadium and part of ferroboron to carry out alloying in a discharging process; finally, adding part of ferroboron and composite modificator in a casting ladle, adding the vanadium-nitrogen alloy, the zirconium ferrosilicon, the ferrosilicon and part of ferroboron in the casting process. The obtained casting piece has a little alloy elements, excellent abrasive resistance and good thermal fatigue resistance. When the high-boron high-speed steel roller material is used as a roller, the service life is prolonged by more than six times relative to a high nickel-chrome infinite cast-iron roller, and prolonged by 20% relative to a high-vanadium high-speed steel roller. Moreover, the roller is safe to use and reliable.

Process for rare-earth smelting resource reclamation and cyclic production

The invention relates to a process for rare-earth smelting resource reclamation and cyclic production. The process has the main characteristic of comprehensively and systematically solving the problems of environmental protection and industrial promotion of the whole rare-earth industrial chain by adopting innovative integrated technical means. The process mainly comprises administration and comprehensive utilization of waste gas, waste water and waste slag, revolution of a rare-earth smelting process, and reclamation and repeated utilization of various important resources such as sulfur, fluorine, ammonium, thorium, phosphorus, calcium and the like so as to achieve smokeless and harmless treatment of the waste gas, full utilization of the resources and zero discharge of industrial waste water and fulfill the final goal of cyclic production. The process radically solves the maximum environment-friendly bottleneck problem in a sustainable development process of the Baotou rare-earth industry from resource advantage to industrial advantage, in particular the historical key environment-friendly technical problem, reduces energy consumption of a large amount of resources and pollutiondischarge, greatly reduces the production cost, upgrades the rare-earth industry, and extends the larger industrial chain at the same time.
Owner:马克印 +1

Smelting technique for cast of wind energy apparatus

InactiveCN101407884AHigh nodularityMeet mechanical performance requirementsSmelting processLiquid iron
The invention discloses a smelting process of castings of wind energy equipment, which is suitable for the smelting production of castings of wind energy equipment with the wall thickness of 60 to 200mm and includes the following steps: a. new pig iron, scrap steel and carburants with special requirements are sent into a melting electric furnace for smelting; b. high temperature liquid iron is subjected to desulfurization treatment by a desulfurization agent; c. the desulfurized liquid iron is returned into a heat insulation electric furnace for component adjustment, and the carburant is added for carrying out pre-treatment of crystal nucleus to graphite in the liquid iron; d. spheroidization treatment is carried out to the liquid iron; e. an inoculant is added into the liquid iron for inoculation; f. the liquid iron is poured to casting sand mold; and g. the castings are naturally cooled to 500 to 550 DEG C for unpacking after finishing pouring. The smelting process of castings of wind energy equipment can increase the spheroidization efficiency of ductile iron castings used by the wind energy equipment, which causes the castings to have good intensity of tension, extensibility and high impact ductility in low temperature environments, thus meeting the requirements on the castings used by the wind energy equipment.

Metal tailings construction nucleated glass and one-step sintering preparation thereof

The invention relates to a building nucleated glass and a production method thereof, which belongs to the utilization technology of metal tailings. The basic glass compositions are (mass percentage): 50-60% of SiO2, 4-11% of Al2O3, 10-13% of CaO, 3-9% of MgO, 4-13% of (FeO and Fe2O3), 3-8% of (K2O and Na2O), 1-2% of BaO and 0.5-1.5% of ZnO; the TiO2 and Cr2O3 are used as a nucleus agent, the content of TiO2 and Cr2O3 is 2-4% and 1-2% respectively; the fluorite is used as the fluxing agent and the content of the fluorite is 2-4% of the total mass. The production method comprises the following steps of: raising the temperature of the glass batch to 1250-1300 DEG C and finishing the sintering and crystallization at the same time, no high-temperature smelting process is needed, which reduces the energy consumption and improves the crystallization effect; also, the mechanical strength and the decay resistance of the product are improved and the sintering temperature is reduced; the mass ratio of the metal tailings in the ingredient reaches more than 55%. The application method of the metal tailings nucleated glass provided by the invention is the same to that of the marble and the granite, the application occasion and the construction position are also the same without special requirements.
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