2617 results about "Smelting process" patented technology

The present invention relates to continuous copper-smelting oxygen bottom blowing furnace process and apparatus. The continuous copper-smelting process includes smelting high grade copper matte in an oxygen bottom blowing furnace, smelting coarse copper product with the high grade copper matte in one other bottom blowing furnace, producing high iron slag, dressing the furnace slag to obtain copper concentrate and returning to smelting furnace, separating out iron concentrate product and obtaining tailings. The process has short flow path, low investment, low power consumption, low cost, environment friendship and other advantages.

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.

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%.

The invention discloses a method for extracting precious metal from a spent automobile catalyst by a concentration smelting-wet separation process, and relates to a method for extracting platinum group metal from an automobile catalyst. The method comprises the following steps of: uniformly mixing the catalyst and auxiliary materials such as a flux and the like, and concentrating the precious metal in an alloy phase by the smelting process; pulverizing the alloy phase, and selectively leaching and separating base metal by using an acidic solvent to obtain a precious metal concentrate; and refining the precious metal concentrate to obtain a precious metal product. Compared with the single wet treatment process, the method has the obvious advantages that: the reagent consumption of a unit product and pollutants are greatly reduced, the recovery rate of the precious metal is greatly improved, the process is shortened, cost is reduced, and economic and environmental benefits are obviouslyimproved.

The invention discloses a high-cleanliness pipeline steel smelting process. The process route comprises molten iron pouring, molten iron pretreatment, converter smelting, tapping, deoxidizing, alloying, LF refining furnace, treating with calcium, RH vacuum furnace and continuous casting and is characterized by comprising the following specific steps: firstly, converter smelting process; secondly, refining furnace smelting process; and thirdly, continuous casting process. The invention belongs to a steel-making process in the field of metallurgy and relates to a method for smelting and controlling a high-cleanliness pipeline steel. By molten iron desulphurization pretreatment, optimizing a converter tapping and deoxidizing system and a slagging system, LF refining furnace deep deoxygenation and reducing slag manufacturing processes, RH high-vacuum-degree degassing and inclusion removal process, the pouring is protected by the continuous casting in the whole process so that the composition of a casting billet is uniform, the contents of harmful elements such as S, P, O, N and H are low, the non-metallic inclusions are effectively controlled, the casting billet is good in internal quality and the production of high value-added ultra-low sulfur steel is ensured.

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.

The present invention belongs to the field of iron and steel smelting technology, and is especially boron steel producing process in a converter. The production process includes the steps of smelting in a converter, deoxidizing and refining in a ladle, and boron alloying. The boron steel producing process has low oxygen content in molten steel after refining, high boron steel yield of 69.4-91.8 %, and excellent application foreground.

The invention discloses a resource utilization method of aluminum ash. The method comprises the following steps: by taking primary slag and flammable dross generated in a smelting process of electrolytic aluminum, and aluminum ash such as salt slag and scum generated in a coarse aluminum refining and processing process as raw materials, recovering aluminum through process steps of crushing, grinding and vibrating screening; and then, respectively carrying out technologies such as washing, pressurized alkaline leaching and normal pressure acid leaching to obtain aluminum oxide-rich aluminum ash. The aluminum ash dried and activated by microwaves returns to an aluminum cell. After the acid-washing liquid waste and alkali-washing waste are effectively neutralized, the acid-washing liquid waste and alkali-washing waste are concentrated and evaporated to recover effective salt. The process provided by the invention can realize resource utilization of aluminum ash on the spot, and is simple and easy to operate and low in production cost, so that the environmental pollution and resource waste caused by aluminum ash are avoided.

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.

The invention discloses a method for smelting a lead-containing material, relating to the technological process for processing complex lead materials by utilizing a smelting method. The method is characterized in that a flash furnace and a depletion furnace are combined for smelting during the smelting process. The method of the invention has the advantages of short and continuous flow, energy saving, large capacity, efficient source utilization, environment protection, good safety and good industrial hygiene, no danger of foam slag exploration and safe production. The lead smelting process with high smelting strength and various advantages realizes single-step lead smelting, and has stronger adaptability on materials. The process is not only suitable for treating lead ore with complex components, but also suitable for treating wet smelting zinc slag, wet smelting copper slag and lead noble metal system slag, can do complementation of lead, zinc and copper and has more advantages over lead, zinc and copper jointed enterprises. The recovery rates of lead and concomitant valuable metals of copper, zinc and noble metals are higher.

The invention discloses a high-strength and heat-resistant magnesium alloy containing two rare earths. The high-strength and heat-resistant magnesium alloy containing the two rare earths comprises the components as follows: 14.0-17.0wt% of Y rare earth, namely Gd, Y and Er, 0.5-2.5wt% of Ce rare earth, namely one or several of La, Ce, Pr, Nd and Sm, 0.3-1.0wt% of Zr, impurities and the balance of Mg, wherein Gd is 11.0-15.0wt%, Y is 0.5-4.0wt% and Er is 0.5-2.0wt%; the content of Nd and Sm elements is 0.2wt% or less of the total amount of the magnesium alloy, or 0; the impurities including Fe, Si, Mn and a small amount of chloride; Fe is less than or equal to 0.002wt %, Si is less than or equal to 0.04wt%, Mn is less than or equal to 0.02wt%, and chloride is less than or equal to 0.002wt%; the impurity content is more than 0; Er in the Y rare earth can be replaced by one or several of Tb, Dy, Ho, Yb and Tm. The magnesium alloy has relatively high mechanical properties at room temperature and relatively stable high temperature creep resistance, and has relatively high yield rate of rare earth elements in the smelting process.

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.

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.

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.

The invention discloses a high-performance uniformity aluminium alloy ingot and a production method thereof. The high-performance uniformity aluminium alloy ingot comprises the following components in percentage by weight: 2.1-3.8 percent of Cu, 7.6-9.3 percent of Si, 0-0.28 percent of Mg, 0-0.9 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, 0-0.1 percent of Sn, 0-0.25 percent of other trace element sum and the balance of Al. The invention also provides the production method of the high-performance uniformity aluminium alloy ingot. The high-performance uniformity aluminium alloy ingot has even alloying components, effectively controls the problem of component segregation and has good mechanical property and good processing property. The production method of the high-performance uniformity aluminium alloy ingot can effectively remove nonmetal materials in waste aluminium materials and reduces slag generated in a smelting process.

The intelligent control system for blast furnace smelting includes the first and the second optimizing stations in the main control room and several operation stations to constitute microcomputer LAN; and server in the iron smeltery connected to various control step terminals to constitute iron smeltery LAN; and the iron smeltery LAN is connected with the main control room LAN to constitute one network system for real-time acquiring and automatic transmitting of process information. The first optimizing station is provided with intelligent control software module and the second with automatic display module. During operation, the intelligent control software module traces the smelting process via real-time data acquisition and operates automatically according to the data from the LAN, and the operation results are output in man-computer dialogue and simple graphic display mode.

A high-strength and high-toughness welding cast steel consists of C 0.12-0.17 wt%, Si 0.10-0.50 wt%, Mn 0.8-1.2 wt%, S+P<=0.025 wt%, Ni 4.00-4.50 wt%, Cr 0.7-1.2 wt%, Mo 0.40-0.50 wt%, V 0.04-0.08 wt%, Cu 0.20-0.40 wt% and iron residue. The process is carried out by selecting electric furnace + AOD duplex smelting process, pouring and heating to obtain final product. The yield strength reaches above 800 MPa, V-shaped notch impact reaches above 55J at -20 degree. It can be used for ship, ocean and petrochemical industries.

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.

The invention belongs to the field of nonferrous metal, in particular to a process and a device for treating decopperized slag by adopting a bottom-blowing molten pool to produce wet lead and raw copper. A bottom-blowing smelter hearth is utilized to smelt decopperized slag to produce wet lead, furnace slag and lead copper matte, ferrum-silico-calcium slag is produced in the smelting process, the furnace slag serves as building material factory raw materials after meeting the disposal slag requirements, and a bottom-blowing converting furnace is utilized to convert the lead copper matte to produce raw copper. The process has low energy consumption, long service life of the furnace, high metal recovery efficiency, low product cost, high smelting environment protectiveness , easy realization of automatic control of process, and high labour productivity; the disposal slag contains low-grade valuable metal, and therefore, the disposal slag can be comprehensively utilized as raw materials in building material industry, which accords with the recycling economy principle.

A method for smelting ferronickel alloy from laterite nickel oxide ore belongs to the ferronickel alloy smelting technical field. A direct reduction technique of carbon-bearing pellets in a rotary hearth furnace is adopted to reduce the nickel oxide in nickel ores to iron and nickel; then iron and nickel are smelted; the solid solutions of nickel and iron are agglomerated, cooled, shattered and subjected to magnetic selection, so that the granular ferronickel alloy with high sulfur content is obtained; and the ferronickel alloy is melted and desulphurized, so that the purified ferronickel alloy is obtained. The invention has the advantages that compared with the traditional process without separation in advance, the follow-up smelting process of the method can save a great amount of energy source for the greatly reduced quantity of slag; and the crude ferronickel obtained through smelting contains relatively low Si content.

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.

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.

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.

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.

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.

The invention relates to a process for producing medium and high carbon steel in sheet billet continuous casting and rolling production, in particular to a process for producing medium and high carbon steel by changing process parameters of all procedures, belonging to the technical field of steel and iron smelting processes. The process is characterized by comprising the following steps of converting operation on blast furnace molten iron, LF (Low Frequency) refining, sheet billet continuous casting, heating, rolling, cooling and coiling to obtain a finished product. The sheet billet continuous casting and rolling process is used for producing the medium and high carbon steel, meets the production requirement by controlling the process parameters of all procedures, overcomes the internal quality defect and the surface quality defect generated in products and improves the product quality and economic benefits.

The present invention relates to one kind of Fe-base RE-adding high performance anticorrosive high strength two phase stainless steel and its smelting process. The stainless steel has proper amount of RE added for modifying and micro alloying, N to replace Ni, properly regulated Cr, Ni, Cu, Mo, Si, Mn and other alloy elements, and added W to raise performance. During smelting, composite active metal elements Re, Mg and Ca are used in treating molten steel; and in electroslag remelting, the RE steel electrode is remelted in a five-component slag system comprising ReO2, MgO, CaO, CaF2 and Al2O3 in the weight ratio of 10 to 10 to 10 to 50 to 20 to result in new material with obviously raised mechanical strength, and improved heat working performance, heat resisting performance and hydrochloric acid corrosion resisting performance. The present invention is suitable for making anticorrosive apparatus for petrochemical, papermaking and other industry.

The invention discloses a steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel and a production method thereof. The steering knuckle non-quenched and tempered steel substituting 40Cr quenched and tempered steel comprises the following components by weight percentage (%):0.35-0.42 of C, 0.50-0.80 of Si, 1.20-1.40 of Mn, less than or equal to 0.013 of P, 0.030-0.050 of S, less than or equal to 0.20 of Cu, 0.20-0.35 of Cr, less than or equal to 0.05 of Mo, 0.010-0.035 of Al, 0.12-0.20 of V, less than or equal to 0.035 of Nb, 0.007-0.020 of Ti, 0.014-0.02 of N, and the balance Fe. According to the component ratio and production method provided by the invention, through perfect combination of the chemical composition optimal design and controlled rolling and controlled cooling technology (rolling parameters), the smelting process, the start rolling temperature and finishing rolling temperature, and the cooling way of the formula are strictly controlled, thus realizing production of the steering knuckle non-quenched and tempered steel with the characteristics of easy turning and high strength and toughness.

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.

The present invention relates to wet noble metal smelting process. The process includes dissolution of coarse ammonium chloroplatinate with sodium hydroxide solution, reduction by adding hydrazine hydrate and filtering to obtain platinum black, hydrogen peroxide and hydrochloric acid dissolution to obtain platinum black, adidng ammonium chloride for fractional deposition of platinum in the form of ammonium chloroplainate, and conventional calcinatino to obtain spongy platinum. The present invention has short technological process, low productino cost, low power consumption, and good operationcondition, and it is possible to produce various products in different grade.