140 results about "Ferrovanadium alloy" patented technology

The invention belongs to the field of metallurgy and particularly relates to a method for preparing ferrovanadium by a rollover furnace through the electro-aluminothermic process. The method for preparing the ferrovanadium by the rollover furnace through the electro-aluminothermic process comprises the steps that raw materials of vanadium oxide, aluminum, iron and lime which meet the production requirement are evenly mixed and then added into the rollover type electric-arc furnace, the method combining multi-phase smelting and stepping aluminum distribution is adopted, most slag is removed after the content of vanadium in the slag is reduced to a certain level, the repeated operation of multiple phases of feeding and slag discharging is conducted, the slag and iron are discharged together when the last phase of smelting is conducted and poured into an ingot mould, and ferrovanadium alloy can be obtained after cooling is conducted. The method for preparing the ferrovanadium by the rollover furnace through the electro-aluminothermic process is convenient to operate, capable of lowering aluminum consumption and obvious in economic benefit; meanwhile, the smelting yield of the ferrovanadium is increased, and the obtained ferrovanadium product is low in content of aluminum.

The invention provides a method for smelting ferrovanadium, which comprises the following steps of: preparing a mixture from 10 to 35 weight percent of lime, 15 to 35 weight percent of aluminum and the balance of V2O3 and / or V2O5; adding the mixture into an electric furnace and adding a predetermined amount of iron according to the requirement simultaneously; electrifying to melt materials in theelectric furnace so as to reduce the V2O3 and / or the V2O5 by using the aluminum, and discharging 80 to 95 weight percent of slag when the content of all vanadium in the slag is less than 0.2 weight percent; adding refined materials consisting of 15 to 35 weight percent of lime, 0 to 30 weight percent of iron oxide and the balance of V2O5 into the electric furnace according to the proportion of 10to 80kg per ton of ferrovanadium, refining, and discharging alloy liquid and refined slag when the content of the aluminum and vanadium in the ferrovanadium alloy liquid meets the requirement of a ferrovanadium alloy product to be produced on the content of the aluminum and the vanadium; and casting to obtain the ferrovanadium alloy product. By the method, 97 to 99 percent of vanadium recovery rate can be achieved, and energy consumption can be reduced.

The invention relates to a nitrided ferrovanadium alloy and a preparing method thereof, and belongs to the material preparing field. According to the method, vanadium oxide, iron oxide or iron and a carbonaceous reducing agent serve as raw materials, the raw materials are mixed according to the proportion and placed in a high-temperature furnace, the nitrogen atmosphere is introduced, the high temperature reaction is carried out to obtain nitrided ferrovanadium, and the high-temperature reaction comprises the high-temperature carbon thermal reduction stage and the medium-temperature nitriding reaction stage, wherein the purity of the nitrided ferrovanadium alloy is larger than 98%, and the nitrogen content is 9-15%. The preparing technology is shortened, and the preparing cost is reduced. The purity and the nitrogen content of the nitrided ferrovanadium are improved by controlling raw material and technology parameters.

The invention provides a method for producing ferrovanadium by an aluminothermic process. The method comprises the steps as follows: a) mixing metallurgical materials comprising vanadium oxide, aluminum particles, scrap iron and lime; b) carrying out reduction smelting in a smelting furnace and deslagging when ending the reduction smelting reaction; and c) adding iron-based oxide into a ferrovanadium alloy solution so as to reduce the content of Al in the ferrovanadium alloy solution to be not more than 0.5%. According to the method, the content of aluminum in the ferrovanadium alloy solution can be effectively reduced by using the iron-based oxide in the refining period, and the content of aluminum in produced ferrovanadium alloy is reduced to be the expected value; and in addition, a large amount of rich vanadium slag is not generated in the process of refining the ferrovanadium alloy solution by using the iron-based oxide, so that the vanadium recovery rate can be increased, the process of treating the vanadium slag is removed, and the production cost can be reduced.

The invention discloses a low-alloy cast steel suitable for a heavy lorry axle housing. The low-alloy cast steel comprises the following elements in percentage by mass: 0.23 to 0.33 percent of C, 0.50 to 1.00 percent of Si, 0.90 to 1.40 percent of Mn, 0.10 to 0.25 percent of Cr, 0.10 to 0.25 percent of Mo, 0.20 to 0.25 percent of V, less than or equal to 0.04 percent of P, less than or equal to 0.04 percent of S, less than or equal to 0.20 percent of residual elements, and the balance of Fe. Waste steel, pig iron, ferromanganese alloy, silicon ferromanganese alloy, ferrochromium alloy, ferromolybdenum alloy and ferrovanadium alloy are used as raw materials of the low-alloy cast steel; and the machining process of the low-alloy cast steel comprises casting and thermal treatment. The low-alloy cast steel has the advantages of high mechanical property, good low-temperature impact toughness and good casting and machining process properties, and is particularly suitable for producing the lorry axle housing.

The invention provides a method for producing ferrovanadium by an aluminothermic process. The method comprises the steps as follows: a) mixing metallurgical materials including vanadium oxide, aluminum particles, scrap iron and lime; b) adding a part of the metallurgical materials into an electric arc furnace for smelting, and deslagging when the content of V in smelting slag is not more than 0.5%; and c) adding another part of the metallurgical materials into the electric arc furnace for smelting, and deslagging when the content of V in the smelting slag is not more than 0.5%; and d) adding vanadium pentoxide and the lime into the electric arc furnace for refining, and discharging a ferrovanadium alloy solution and rich ferrovanadium slag when the content of aluminum in the ferrovanadium alloy solution is not more than 1.5%. According to the method, the vanadium yield can be increased, the content of aluminum residues in vanadium can be effectively controlled, and the single furnace capacity of the ferrovanadium can be increased.

The present invention belongs to the field of ferrovanadium alloy preparing technology. The material comprising powdered vanadium compound, carbon reductant and iron powder is first added with adhesive and pressed into block, and the block after stoving is made to produce carbon thermal reduction at 800-1200 deg.c and sintering reaction at 1250-1440 deg.c inside a metallurgical furnace to obtain high density sintered ferrovanadium alloy, with the total reaction time inside the furnace being 2-12 hr. The sintered ferrovanadium alloy consists of V 47-82 wt%, C not more than0.50 wt%, Fe 17-52 wt%, Si not more than 1.50 wt%, Al not more than 0.01 wt%, Mn not more than 0.50 wt%, S not more than 0.05 wt% and P not more than 0.06%.

The invention relates to a method for preparing a vanadium nitride iron alloy. The method comprises the steps that a vanadium source, a carbonaceous reducing agent and iron powder are mixed and then pressed into bulk materials; the bulk materials are heated and subjected to a carbonization reaction, then the temperature rises 1300-1500 DEG C under the nitrogen atmosphere for a first-time nitridingreaction; and after heat preservation is finished, the temperature is reduced to 1100-1300 DEG C for a second-time nitriding reaction, and the vanadium nitride iron alloy is obtained after the reaction. According to the method for preparing the vanadium nitride iron alloy, the two-step nitriding method is utilized to prepare high-nitrogen vanadium nitride iron, and the vanadium nitride iron withthe nitrogen content being 14.0-15.5 wt% is prepared by adjusting the temperature and the nitrogen flow rate; and at the same time, the purity of products is effectively improved, the contents of impurity elements such as oxygen and carbon are reduced, and vanadium nitride iron products with the greater proportion and the better quality are obtained. The method for preparing the vanadium nitride iron alloy is simple in process, common in used equipment and low in energy consumption in the preparing process of the vanadium nitride iron, and has good application prospects.

The invention belongs to the field of metallurgy, and specifically relates to an external refining method for smelting a ferrovanadium alloy. The invention aims at providing an external refining method for smelting ferrovanadium, with regard to problems of a high vanadium content, high power consumption, serious electric furnace body erosion and the like in slag in a last smelting period of an existing ferrovanadium smelting method adopting a multi-period method. The method comprises two-period electric furnace smelting, a primarily-molten alloy after deslagging is cast in an ingot mould filled with a refining material and subjected to a mixing reaction after the smelting is completed, and external refining is carried out. The method is capable of greatly reducing a single-furnace power-on time, reducing furnace lining erosion of an electric smelting furnace, and prolonging an alloy deposition time, thus increase for an alloy yield is benefited, and remarkable social and economic benefits are achieved.

The invention discloses a method for smelting rail steel with vanadium-bearing hot metal as raw materials. The method comprises the steps that firstly, deep desulphurization is carried out on the vanadium-bearing hot metal through a combined injection method, and thus low-sulfur vanadium-bearing hot metal with the sulphur content smaller than 0.008% is obtained; then, the low-sulfur vanadium-bearing hot metal is put in a converter, a dephosphorization agent is added, blowing vanadium and carbon holding pre-dephosphorization is carried out, and thus vanadium-bearing semisteel with the P content smaller than or equal to 0.040% is obtained; a part of the vanadium-bearing semisteel is tapped in a steel ladle, smelting deep dephosphorization continues to be carried out on the rest part of the vanadium-bearing semisteel through converter slag formation, and thus end point molten steel with the P content smaller than or equal to 0.008% is obtained; and finally, tapped steel of the end point molten steel and the vanadium-bearing semisteel are mixed, a proper amount of deoxidization alloy and high-alkalinity refining slag is added, bottom argon blowing mixing is carried out on the steel ladle, and qualified molten rail steel is obtained. According to the method disclosed by the invention, the operation method is simple, and the production cost is low; the effective utilization and extraction of vanadium resources are guaranteed, and dephosphorization and little slag smelting can be effectively achieved in the converter steelmaking process; meanwhile, the energy is saved, the amount of adopted ferrovanadium alloy and carburant is greatly lowered, and the smelting cost is lowered.

The invention belongs to the field of an analysis and detection technology, and relates to a method for preparing a ferrovanadium alloy fusing sample for X-ray spectrofluorimetry. The method for preparing ferrovanadium alloy fusing sample provided by the invention is as follows: placing the ferrovanadium into a platinum crucible, adding a certain amount of nitric acid and sulphoric acid to dissolve the ferrovanadium in turn, and evaporating the ferrovanadium to dryness after the ferrovanadium is fully dissolved; adding an antioxidant and a fluxing agent into the platinum crucible; and placing the platinum crucible into a sample fusing furnace to fuse so as to prepare a ferrovanadium glass fuse piece for the X-ray spectrofluorimetry in the sample fusing furnace. According to the method, the platinum crucible can not be corroded, the sampling time is short, and the prepared glass fuse piece is uniform, so that the grain-size effect and the mineral effect are eliminated completely. According to the method, the operation is simple and convenient, the safety and reliability are realized, and the repeatability is good.

The invention provides a method for smelting ferrovanadium, which comprises the following steps of: preparing a mixture from 10 to 35 weight percent of lime, 15 to 35 weight percent of aluminum and the balance of V2O3 and / or V2O5; adding the mixture into an electric furnace and adding a predetermined amount of iron according to the requirement simultaneously; electrifying to melt materials in theelectric furnace so as to reduce the V2O3 and / or the V2O5 by using the aluminum, and discharging 80 to 95 weight percent of slag when the content of all vanadium in the slag is less than 0.2 weight percent; adding refined materials consisting of 15 to 35 weight percent of lime, 0 to 30 weight percent of iron oxide and the balance of V2O5 into the electric furnace according to the proportion of 10to 80kg per ton of ferrovanadium, refining, and discharging alloy liquid and refined slag when the content of the aluminum and vanadium in the ferrovanadium alloy liquid meets the requirement of a ferrovanadium alloy product to be produced on the content of the aluminum and the vanadium; and casting to obtain the ferrovanadium alloy product. By the method, 97 to 99 percent of vanadium recovery rate can be achieved, and energy consumption can be reduced.

The invention relates to a pollution-free production process for a ferrovanadium alloy, and belongs to the technical field of metallurgical ferrovanadium alloy production. Two ferrovanadium production processes, namely an electro-silicothermic process and an electro-aluminothermic process are implemented in the same field through integrative innovation to achieve the capacity of producing all marks of ferrovanadium alloys, raw material complementarity in the two ferrovanadium alloy smelting processes is fully utilized, ferrovanadium powder produced by crushing a ferrovanadium finished productis directly used for producing nitrided ferrovanadium without being returned to the process for secondary smelting, and slag, linings, process waste and the like in the electro-aluminothermic processare recycled in an electro-silicothermic furnace, so that the high-efficiency and pollution-free production of smelting the ferrovanadium alloy is realized; smelting lean slag, dust and industrial wastewater produced in the two processes are recycled, the comprehensive energy consumption of the process is reduced, the resource utilization rate of smelting the ferrovanadium alloy is improved, and wastewater and waste residue are not produced in the whole process; and a circular economy concept is accorded, and the two ferrovanadium production processes, namely the electro-silicothermic processand the electro-aluminothermic process are implemented in the same field, so that design construction is integrated, and engineering cost is reduced.

The invention discloses a composite material for a refractory brick mold. The composite material comprises ferrovanadium alloy steel and Q235 steel, wherein the ferrovanadium alloy steel is a coating and covers a matrix made of the Q235 steel. The preparation method comprises the following steps of: compounding Fe-V alloy with low vanadium content and the Q235 steel by adopting a hot rolling method; performing carburizing treatment on the composite material to improve the hardness and wear resistance of the coating; and performing quenching and tempering treatment on the composite material. Therefore, the Fe-V alloy coating of the composite material has the hardness of about HRC65 and high wear resistance. Repeated study and practice prove that: when the composite material is used for the refractory brick mold, the service life of the composite material is 2 times higher than that of steel (Q235 subjected to carburizing treatment) of the conventional refractory brick mold.

The invention relates to the technical field of metallurgy, and discloses a method for preparing a ferrovanadium alloy from titanium tetrachloride refined tailings. The method comprises the following steps of (1) crushing and levigating the titanium tetrachloride refined tailings, and oxidizing and roasting in a rotary kiln to obtain vanadium-containing roasted clinker; (2) uniformly mixing the vanadium-containing roasted clinker and vanadium oxide with iron particles, a reducing agent, a slag former and a heat generating agent to obtain a ferrovanadium smelting mixture, and then uniformly distributing the ferrovanadium smelting mixture in a smelting furnace for smelting; and (3) after finishing smelting and naturally cooling a furnace body, slag and gold, disassembling the furnace body, separating the slag and gold, and obtaining a ferrovanadium alloy cake and the smelting slag. According to the method, the titanium tetrachloride refined tailings are roasted to obtain the vanadium-containing roasted clinker, the vanadium-containing roasted clinker and vanadium oxide serve as mixed vanadium-containing raw materials, smelting is conducted according to the electrothermal reduction technology and the self-propagating smelting technology, a qualified ferrovanadium alloy product can be prepared, the vanadium smelting yield is high, and the generated smelting slag can be used as a titanium extraction raw material for further resource utilization.

The invention discloses a preparation method of a ferrovanadium alloy. The method includes: (1) subjecting vanadium slag, reducing coal and an additive to mixing pelletizing so as to obtain mixed pellets; (2) supplying the mixed pellets to a reduction roasting device to conduct reduction roasting treatment so as to obtain metallized pellets; and (3) mixing the metallized pellets with vanadium pentoxide, aluminum granules and lime, then supplying the mixture to an electric-arc furnace to perform smelting treatment, thus obtaining the ferrovanadium alloy. The method provided by the invention achieves comprehensive utilization of iron in vanadium slag to replace steel scraps for ferrovanadium smelting. Compared with the existing ferrovanadium smelting technology, the method saves the comprehensive energy consumption by more than 20%, reduces aluminum granule consumption by more than 70%, and lowers steel scrap consumption by 100%.

The invention discloses a self-stirring process for smelting of ferrovanadium and belongs to the field of iron and steel smelting technology. The provided self-stirring process is simple to operate, ensures a long service life of a furnace lining and is high in alloy yield. The process is characterized in that a spherical self-stirring agent is added into a molten pool after an aluminothermic reduction spontaneous reaction, sufficient stirring of the molten pool is achieved by such means as heat release of the self-stirring agent, characteristic improvement of molten slag and gas generation topromote deep reduction of a material, molten slag gold is poured into a casting sand mold after finish of primary self-stirring for mixed melting of the slag gold, and secondary self-stirring is realized. The content of vanadium in the slag can be remarkably reduced through the self-stirring operation during smelting of ferrovanadium, so that the service life of an electric furnace is greatly prolonged.

The invention discloses a method for preparing nitrided ferrovanadium by using a vacuum furnace. A material is pretreated to realize quick heating in the vacuum furnace and to finish the drying, the carbonization and the nitriding within 7-8 hours, so that the time is effectively saved, and the production cost is largely reduced while the production efficiency of the vacuum furnace is improved. The method is used for preparing a nitrided ferrovanadium alloy to achieve the advantages of simple operation, low cost, accurate process control, stable product production and no environmental pollution. The vanadium content of the prepared nitrided ferrovanadium alloy is more than 45%, the nitrogen content can be more than 9%, and the impurity content is low.

The invention relates to a technology for preparing nitrided ferrovanadium alloy. The technology includes the following steps that at a reduction-nitridation stage, raw materials are put into a high-temperature reactor after being evenly mixed in proportion, and argon is connected in at first; the temperature is raised in the protective atmosphere of the argon; when the temperature rises to the reaction temperature of a reduction-nitridation reaction, ammonia gas is connected in for carrying out the reduction-nitridation reaction; connecting in of the ammonia gas is stopped after the reactionis completed, argon is connected in, and a product of the reduction-nitridation reaction is sintered in the argon atmosphere; and finally the product is cooled to be at an indoor temperature in the argon atmosphere and the block-shaped nitrided ferrovanadium alloy is obtained. According to the technology, reaction and nitridation reactions are carried out synchronously, and the preparation technology is simplified; and the impurity element carbon cannot be introduced in the prepared nitrided ferrovanadium alloy, the product purity is improved, and the phenomenon that greenhouse gases are emitted to cause environmental problems can be avoided.

The present invention provides a method for preparing ferrovanadium alloys based on aluminothermic self-propagating gradient reduction and slag washing refining. The method includes the steps of (1) performing aluminothermic self-propagating gradient reduction; (2) performing heat preserving and smelting to obtain an upper layer alumina-based slag and a lower layer alloy melt; (3) jetting refining slags into the lower layer alloy melt, and performing stirring and slag washing refining; and (4) cooling the refined high-temperature melt to room temperature, and removing an upper layer smelting slag to obtain the ferrovanadium alloys.

The invention belongs to the technical field of iron alloy, and specifically relates to nitrided silicon-vanadium-iron alloy and a production method thereof. The provided nitrided silicon-vanadium-iron alloy is composed of the following components in percent by weight: 25-55 wt% of vanadium, 11-26 wt% of nitrogen, 8-20 wt% of silicon, and the balance iron and unavoidable impurities. The provided production method for the nitrided silicon-vanadium-iron alloy comprises: crushing the raw material silicon-vanadium-iron alloy, reacting with nitrogen under high temperature, and cooling to obtain the nitrided silicon-vanadium-iron.

The invention relates to the technical field of alloy smelting, and discloses a method for co-producing ferrovanadium and calcium aluminate cement. The method comprises the following steps: (1) mixingan aluminum oxide knotting material, a binder and an auxiliary binder, knotting a furnace lining, and then curing and drying the knotted furnace lining; (2) preparing vanadium pentoxide, aluminum particles, lime and scrap iron into a mixture, wherein taking the total weight amount of the mixture as 100 parts, the content of the lime is 20-25 parts; (3) adding the mixture obtained in the step (2)into an electric furnace, starting the electric furnace for smelting, and separating ferrovanadium slag from ferrovanadium alloy; and (4) carrying out crushing, pre-grinding, magnetic separation ironremoval and fine grinding on the ferrovanadium slag separated in the step (3) to obtain pure calcium aluminate cement. According to the method, aluminum oxide is adopted as a furnace lining knotting material, the content of lime is increased to 20-25% for ferrovanadium smelting, pure calcium aluminate cement can be obtained from an obtained slag phase, and the utilization additional value of ferrovanadium slag is increased.

The invention relates to the field of steel bar processing technologies, in particular to an HRB400E twisted steel bar added with a high-nitrogen reinforced alloy and a production process thereof. Thetwisted steel bar comprises, by mass: 0.22-0.25% of C, 0.45-0.55% of Si, 1.40-1.50% of Mn, 0.010-0.020% of Ti, less than or equal to 0.040% of P, less than or equal to 0.040% of S, 0.009-0.012% of N,and the balance Fe and inevitable impurities. In the production process, the high-nitrogen reinforced alloy is added during smelting to replace a ferrovanadium alloy, a vanadium-nitrogen alloy and the like to be used for producing hot-rolled ribbed steel bars, and precipitation strengthening of N compounds is promoted through controlled rolling. Through a composite strengthening process, the strength, toughness and ductility of steel are improved, the steel has good welding performance and fatigue performance, and the cost per ton of steel is reduced. The problems that the production cost ofthe hot-rolled ribbed steel bars is high and vanadium resources are in shortage are solved, and the requirements of market development are met.

The invention discloses a method for preparing ferrovanadium alloy based on vanadium slag. The method comprises the following steps: using vanadium slag, including 14-30% of vanadium pentoxide and iron oxide by mass, as a raw material, and adding reducing carbon and a slagging auxiliary material for smelting and reacting to finally obtain ferrovanadium alloy. The slagging auxiliary material comprises any one or a mixture of silicon slag, silica and industrial silicon. According to the method, the silicon slag and the reducing carbon are combined, the qualified ferrovanadium alloy is prepared from the vanadium slag, the silicon simple substance and the semi-coke in the silicon slag are combined, vanadium pentoxide and low-price intermediate oxide of vanadium can be effectively and fully reduced, and it is guaranteed that the vanadium has a high recovery rate; and silicon dioxide hydrate in the silicon slag and silicon dioxide obtained through later decomposition can effectively reduce the basicity of the slag, and ferrovanadium alloy is prepared under the condition of low basicity.

The invention discloses a preparing method for a vanadium-iron alloy and belongs to the technical field of metallurgy. The preparing method includes the following steps that a, a vanadium-containing material is adopted as the raw material, the smelting process is divided into N stages, mixing materials are configured respectively in all the stages, the mixing materials from the first stage to the(N-1)th stage are fed into a furnace into two batches for smelting, after smelting of the (N-1)th stage is over and slag is discharged, the mixing material in the Nth stage is added into the furnace at a time for smelting prereduction, the aluminum matching coefficient of the first batch of mixing materials from the first stage to the (N-1)th stage is 1.0-1.1, the aluminum matching coefficient ofthe second match of mixing materials from the first stage to the (N-1)th stage is 1.0-1.4, the aluminum matching coefficient of the mixing materials in the Nth stage is 0.2-1.0, and the comprehensivealuminum matching coefficient of the total furnace charge is 1.00-1.08; and b, after reduction is over, molten slag metal is tipped over into a refining furnace for refining, after refining is over, furnace demounting is conducted after a furnace body is cooled naturally, the slag metal is separated, and the alloy is obtained. By means of the method, the thermodynamics conditions in the smelting process are better improved in the smelting process, and vanadium losses in the slag can also be greatly reduced.

The invention provides a wear-resistant alloy containing V and Cr and a preparation method thereof, belonging to the technical field of metal wear-resistant materials. The preparation method of the alloy comprises the following steps: firstly adding pig iron, a carburant, steel scrap, ferrochromium, ferroniobium, ferromolybdenum and other furnace charge and raising temperature to 1530-1550 DEG C, controlling the chemical components of molten metal in a furnace as follows in mass fraction: 3.2-3.5% of C, 10-12% of Cr, 3.0-3.5% of Mo, 4.0-4.5% of Nb, less than 0.8% of Si, less than 0.8% of Mn, less than 0.05% of S, less than 0.05% of P and the balance of Fe and inevitable impurities; further adding a proper amount of ferrovanadium alloy, ferro-titanium alloy and ferroboron alloy; and finally adding nitrogen-bearing ferrochromium, nickel-magnesium alloy, metal zinc and SI-Ca-Ba-Al alloy. The prepared alloy material has excellent properties after being subjected to heat treatment.

The invention discloses a high-nitrogen low-oxygen silicon nitride vanadium iron alloy and a preparation method thereof, and belong to the technical field of iron alloys. The high-nitrogen low-oxygensilicon nitride vanadium iron alloy is prepared from the compositions in percentage by weight: 30%-34% of vanadium, 10%-15% of silicon, 14%-16% of nitrogen, less than or equal to 0.8% of oxygen, lessthan or equal to 0.3% of C, less than or equal to 0.03% of sulfur, less than or equal to 0.05% of phosphorus and the balance of Fe. According to the preparation method of the high-nitrogen low-oxygensilicon nitride vanadium iron alloy, production is carried out at a micro-positive pressure of 0.18-0.2MPa, vanadium and silicon are separately nitrided at different temperatures in two steps, the nitriding effect of vanadium and silicon is fully guaranteed, and the nitrogen content in the alloy is improved; meanwhile, a raw material of the preparation method is purchased Ferrosilicon vanadium, the cost is low, the content of each component in a raw material product can be controlled, and the process route is simple; and meanwhile, a high vacuum sintering furnace is used for nitriding reaction, mass production can be carried out, and the preparation method can be applied on a large scale in the industry.

The invention relates to a seamless steel tube for a rare-earth-containing L625Q submerged pipeline and a production method of the seamless steel tube. The production method comprises the following steps: carrying out pretreatment on blast furnace molten iron so that the S content of the blast furnace molten iron is reduced to below 0.010% in percentage by mass; adding the treated blast furnace molten iron and steel scrap to a top-bottom combined blowing converter for smelting, adopting deoxidation alloy in the steel tapping process for deoxidation alloying, carrying out final deoxidation by adopting an aluminum deoxidation technology, carrying out slag blocking or deslagging in the steel tapping process, adding lime blocks after adding the alloy in the steel tapping process, then adding the smelted molten iron to an LF (Ladle Furnace) for refining, blowing argon during refining, and heating for warming in a manner of gradually increasing the warming speed; then carrying out slag making, desulfurization, composition adjustment and warming operations; adopting the operation of white slag making, and adding ferrovanadium alloy and ferrotitanium alloy; finally continuously blowing argon gas softly at the bottom, adding rare earth wires, and then carrying out VD (Vacuum Distillation) vacuum treatment, round billet continuous casting, tube blank heating, perforating, continuous rolling, sizing, cooling, saw cutting, heat treatment, straightening, flaw detection and chamfering.

The invention discloses a pouring method of a ferro-vanadium alloy and belongs to the technical field of metallurgy. The method comprise the following steps of a, uniformly mixing smelting raw materials according to a demand on a produced ferro-vanadium alloy product and adding the raw materials into a tilting electric furnace to be smelted; b, after smelting, tilting slag into a pouring ingot mould for secondarily deep reduction of the slag, and carrying out cooling to obtain an alloy, wherein a reduction mixture is pre-added into the pouring ingot mould and c, after deslagging, carrying outstaged pouring and cooling on the molten alloy in the furnace to obtain the alloy. By secondarily deep reduction of the slag, the method can further recover vanadium in waste slag favorably. By stagedpouring of the molten alloy, cooling and stirring of the alloy in the pouring process are facilitated, the shape of a poured alloy cake is changed, and the later crushing performance of the alloy isimproved.