Abstract

Disclosed in the present invention is an operating method for the stable and smooth operation of a large blast furnace for high-titanium vanadium titano-magnetite, comprising: a distribution system: dividing a furnace throat into twelve annuluses of equal area in an matrix, such that the points of fall of ore are distributed from the 5th to 10th annuluses and the sum of the proportions of edge coke and central coke is within the range of 70-80%, forming a distribution matrix on the basis of various historical distribution data, setting an ore distribution angle on the basis of a stock line length, and controlling a blast furnace throat temperature to be 60-120℃; a blast system: under a normal production condition, using a symmetrical arrangement of two tuyeres of different areas and, under the condition of medium- and long-term abnormal production, adjusting the area of the tuyeres on the basis of a blast volume; and a slagging system and a heating system. The present invention solves the difficult problems, such as great difficulty in improving furnace charge smelting properties, great difficulty in adjusting intensified smelting operations, and great difficulty in recovering fluctuating furnace conditions, of large blast furnaces for high-titanium vanadium titano-magnetite, thereby achieving the long-term stable and smooth operation of the large blast furnaces for high-titanium vanadium titano-magnetite and maintaining the smooth highly-effective smelting operation thereof.

IPC Classes  ?

• C21B 7/18 - Bell-and-hopper arrangements
• C21B 5/00 - Making pig-iron in the blast furnace

Abstract

33 - type anion exchange resin to obtain a vanadium-rich resin and an ion exchange residual liquid; b, returning the ion exchange residual liquid to a carbonation leaching process for use; c, enabling the vanadium-rich resin to be in contact with a desorbent to obtain a desorption liquid; d, adding ammonium bicarbonate into the desorption liquid for vanadium precipitation, and filtering to obtain ammonium metavanadate and vanadium precipitation residual liquid; and e, returning the vanadium precipitation residual liquid to the step c for use; wherein the desorbent is a solution containing ammonium bicarbonate and sodium bicarbonate. According to the method, the ion exchange resin is used as a carrier to achieve the exchange of vanadate radicals and bicarbonate radicals, so that the technological process of recycling vanadium from the carbonated leach liquor and circulating a medium is simplified; the whole technological process is performed at normal temperature, and energy consumption is reduced.

IPC Classes  ?

• C22B 34/22 - Obtaining vanadium
• C22B 3/12 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic alkaline solutions
• C22B 3/42 - Treatment or purification of solutions, e.g. obtained by leaching by ion-exchange extraction
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof

Abstract

A vanadium extraction and medium recycling method based on the carbonation leaching of vanadium slag, comprising the following steps: S1, roasting to prepare a powdered clinker; S2, preparing a concentrated solution and a deamination solution; S3, performing a vanadium slag-based vanadium extraction and medium circulation process; and circularly operating step S3.

IPC Classes  ?

• C22B 34/22 - Obtaining vanadium
• C22B 1/02 - Roasting processes
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• C22B 7/04 - Working-up slag

Abstract

The present invention relates to the technical field of vanadium hydrometallurgy, and specifically relates to a method for clean vanadium extraction by carbonation leaching of vanadium slag. The technical problem to be solved by the present invention is to provide a method for clean vanadium extraction by carbonation leaching of vanadium slag, capable of reducing solid waste and improving the vanadium precipitation rate. The method comprises the following steps: a. uniformly mixing vanadium slag with a calcium salt and firing the mixture to obtain a fired clinker; b. adding water, a sodium-containing carbonate, and an ammonium-containing carbonate to the fired clinker for leaching, and performing solid-liquid separation to obtain a leachate, the amount of the sodium-containing carbonate, calculated as Na, being 1.0-1.5 times of the molar ratio of vanadium in the fired clinker; and c. adding a desilicating agent to the leachate, performing solid-liquid separation to obtain a desilicated solution, precipitating vanadium, performing solid-liquid separation to obtain ammonium metavanadate and a vanadium-precipitated supernatant, and calcining the ammonium metavanadate to obtain vanadium oxide. The method of the present invention improves the vanadium precipitation rate, reduces the use of leaching agents, and greatly reduces the generation of solid waste.

IPC Classes  ?

• C22B 1/02 - Roasting processes
• C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching
• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
• C22B 34/22 - Obtaining vanadium

Abstract

3 powder, and 250-350 parts of talcum powder. The coating of the invention can avoid the bonding reaction with a roller or a winch of the steel equipment in the rolling or perforation process of a titanium tube at 900° C., so as to improve the yield and the production efficiency of titanium material processing. Moreover, the process is simple and easy to operate, the coating is environment-friendly and pollution-free, and easy to prepare.

IPC Classes  ?

• C09D 7/61 - Additives non-macromolecular inorganic
• C09D 7/65 - Additives macromolecular
• B21B 27/02 - Shape or construction of rolls
• C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins
• C09D 175/04 - Polyurethanes

Abstract

Provided is a manufacturing method for high-toughness and plasticity hypereutectoid rail, including: a. hot rolling the steel billet into rail; b. blowing a cooling medium to the top surface of railhead, wherein, the two sides of railhead and the lower jaws on the two sides of railhead after the center of top surface of rail is air-cooled to 800-850° C., and cooling the rail until the center temperature of the top surface is 520-550° C.; c. stop blowing the cooling medium to the lower jaws on the two sides of railhead, continue blowing the cooling medium to the top surface of railhead and the two sides of railhead, and air cool the rail to room temperature after the surface temperature of railhead is cooled to 430-480° C. The resulting hypereutectoid rail has higher toughness and plasticity than existing products, which is suitable for heavy-haul railway, especially for small radius curve sections.

IPC Classes  ?

• B21B 1/085 - Rail sections
• B21B 1/22 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-sectionSequence of operations in milling trainsLayout of rolling-mill plant, e.g. grouping of standsSuccession of passes or of sectional pass alternations for rolling bands or sheets of indefinite length
• C21D 1/667 - Quenching devices for spray quenching
• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/26 - Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium

Abstract

The invention discloses a mobile flash butt welding method for 136RE+SS heat-treated rail, and particularly a mobile flash butt welding method for 136RE+SS heat-treated rail in the technical field of rail welding. The mobile flash butt welding method for 136RE+SS heat-treated rail in the invention includes a pre-flash stage, a flash stage, a boost stage, an upset stage and a forge stage, with a total heat input of 7.1 MJ-10.0 MJ, a total duration of 110 s-135 s and an upsetting distance of 12.8 mm-16.7 mm during the welding process. By adopting the method of the invention, mobile flash butt welding can be conducted for 136RE+SS heat-treated rail successfully, and the rail joint has less internal defects but stable welding quality, and can pass fatigue test, tensile test and slow bend test to meet the requirements. Besides, the rail joint can pass the drop weight test for 15 welds continuously, demonstrating better stability.

IPC Classes  ?

• B23K 11/04 - Flash butt welding
• E01B 29/44 - Methods for effecting joining of rails in the track, e.g. taking account of ambient temperature
• C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for welded joints
• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails
• B23K 101/26 - Railway- or like rails

Abstract

A method for use in producing battery-grade vanadium oxide, comprising the following steps: A. adding a vanadium-containing leaching solution into a mixed solution of ammonium carbonate, ammonia water and ammonium sulfate, stirring to precipitate, and separating liquid from solid to obtain a crude vanadium-containing product; B. using hot water to wash the crude vanadium-containing product to obtain a purified vanadium-containing leaching solution; C. adjusting the pH of the purified vanadium-containing leaching solution to 1.5-2.5, and adding said solution into a boiling ammonium sulfate solution, heating and stirring, precipitating and separating solid from liquid to obtain high-purity ammonium polyvanadate (APV), washing, drying and calcinating the APV to obtain battery-grade vanadium pentoxide.

IPC Classes  ?

• C22B 3/44 - Treatment or purification of solutions, e.g. obtained by leaching by chemical processes
• C22B 34/22 - Obtaining vanadium
• C22B 1/02 - Roasting processes
• C22B 3/08 - Sulfuric acid

Abstract

A coating preventing against adhesion between metals, specifically relating to an aqueous high-temperature-resistant coating for preventing against adhesion between titanium and steel and applications thereof in the preparation of titanium ingots. The aqueous high-temperature-resistant coating for preventing against adhesion between titanium and steel comprises the following components in parts by weight: 50 to 150 parts of aqueous film former, 0 to 50 parts of Zn powder, 400 to 450 parts of Al2O3 powder and 250 to 350 parts of talcum powder. By means of the obtained coating layer, it can be ensured that a titanium tube does not have an adhesive reaction with a roller or a capstan of a steel and iron device in the rolling or perforation procedure in the temperature of 900ºC, thereby improving the rate of finished products and the production efficiency of titanium materials; the process is simple, operations are easy, and the coating is environmentally-friendly and pollution-free, and the preparation method is simple.

IPC Classes  ?

• C09D 163/00 - Coating compositions based on epoxy resinsCoating compositions based on derivatives of epoxy resins
• C09D 175/04 - Polyurethanes

Abstract

The present invention provides a passivant for hot-dip Al—Zn-coated sheet of which the raw materials include: 2˜6 parts by weight of water soluble molybdate, 4˜12 parts by weight of water soluble manganese salt, 50˜100 parts by weight of basic silica sol and 50˜100 parts by weight of water soluble organic resin. The present invention also provides a method to prepare the passivant for hot-dip Al—Zn-coated sheet including the following steps: adding and dissolving water soluble molybdate and water soluble manganese salt into deionized water; adding basic silica sol into the solution and mixing well; adding water soluble organic resin into the solution and mixing well; regulating the pH value of the solution to 5˜8 by using phosphoric acid. The present invention also provides a hot-dip Al—Zn-coated sheet treated with the present passivant and a method to passivate hot-dip Al—Zn-coated sheet.

IPC Classes  ?

• B32B 15/08 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
• B05D 3/00 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
• B05D 3/02 - Pretreatment of surfaces to which liquids or other fluent materials are to be appliedAfter-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
• C09K 15/32 - Anti-oxidant compositionsCompositions inhibiting chemical change containing organic compounds containing boron, silicon, phosphorus, selenium, tellurium or a metal
• B05D 7/14 - Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies

Abstract

6+, and satisfies the requirement of EU RoHS Directive.

IPC Classes  ?

• C08K 3/36 - Silica
• B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
• C09D 5/08 - Anti-corrosive paints

Abstract

A high carbon content and high strength heat-treated steel rail including by weight 0.80-1.20% carbon, 0.20-1.20% silicon, 0.20-1.60% manganese, 0.15-1.20% chromium, 0.01-0.20% vanadium, 0.002-0.050% titanium, less than or equal to 0.030% phosphorus, less than or equal to 0.030% sulfur, less than or equal to 0.010% aluminum, less than or equal to 0.0100% nitrogen, and iron. The steel rail has excellent wear resistance and plasticity and can satisfy the requirement for overloading. A method for producing the steal rail by heating a slab to a heating temperature, multi-pass rolling, and accelerated cooling, wherein a maximum heating temperature (° C.) of said slab is equal to 1,400 minus 100[% C], [% C] representing the carbon content (wt. %) of said slab multiplied by 100.

IPC Classes  ?

• C21D 9/04 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articlesFurnaces therefor for rails
• C22C 38/18 - Ferrous alloys, e.g. steel alloys containing chromium
• C21D 1/667 - Quenching devices for spray quenching
• C22C 38/00 - Ferrous alloys, e.g. steel alloys
• C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
• C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
• C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
• C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• B21B 1/085 - Rail sections

Abstract

Provided is a passivation treatment agent for a hot-dip aluminum-zinc plated sheet, raw materials of which comprise 2 to 6 parts by weight of a water-soluble molybdate, 4 to 12 parts by weight of a water-soluble manganese salt, 50 to 100 parts by weight of an alkaline silica sol, and 50 to 100 parts by weight of a water-soluble organic resin. Also provided is a method for producing the passivation treatment agent for the hot-dip aluminum-zinc plated sheet, which includes the following steps of: dissolving the water-soluble molybdate and the water-soluble manganese salt in deionized water to form a solution, adding the alkaline silica sol into the solution and mixing uniformly, then adding the water-soluble organic resin and mixing uniformly, adjusting the pH value of the solution with phosphoric acid to 5-8. Also provided are the hot-dip aluminum-zinc plated sheet treated with the passivation treatment agent therefor and a passivation treatment method thereof.

IPC Classes  ?

• C23C 22/40 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing molybdates, tungstates or vanadates
• C23C 22/68 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8

Abstract

A coating composition is provided, the starting materials of which comprise nano SiO2, film-forming substance, film-forming aid, accelerator, acid, and water. The composition has pH of 3-9. A passivated zinc-plated material is also provided. The zinc-plated material comprises zinc-plated substrate and passivated coat adhered to the surface of the zinc-plated substrate, wherein the passivated coat is formed by curing the coating composition. The coating composition can impart to the zinc-plated material excellent corrosion resistance, water resistance, high temperature resistance, surface conductivity, and adhesion to the zinc-plated substrate. Additionally, the coating composition contains no Cr6+, and satisfies the requirement of EU RoHS Directive.

IPC Classes  ?

• C09D 5/08 - Anti-corrosive paints
• C23C 22/05 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions

Abstract

Provided is a production method of vanadium oxide using ion-exchange to realize wastewater circulation, which belongs to the technical field of vanadium oxide extraction, and can not only obtain high quality vanadium product but also circulate and reuse vanadium extraction wastewater. The method comprises preparing raw material to be roasted, calcifying roasting, leaching, solid-liquid separating, ion-exchanging, vanadium precipitating, and removing ammonia by calcination or reducing to prepare vanadium oxide; where vanadium extraction wastewater is returned to the system for circulation and reuse after neutralization treatment with lime milk, and no wastewater discharge is realized. Vanadium recovery rate is improved, and production cost is reduced. By combining with other techniques, the method can also convert waste resulted from extraction into secondary resource for reuse, so as to realize clean production.

IPC Classes  ?

• C01G 31/02 - Oxides

Abstract

The present invention relates to a production method of vanadium oxide using extraction, and belongs to the technical field of vanadium oxide extraction. The technical problem to be solved in the present invention is to provide a clean vanadium oxide production method which can not only obtain high quality vanadium product but also circulate and reuse vanadium extraction wastewater. The inventive method comprises preparing raw material to be roasted, calcifying roasting, leaching, solid-liquid separating, extraction, vanadium precipitating, and removing ammonia by calcination or reducing to prepare vanadium oxide; where vanadium extraction wastewater is returned to the system for circulation and reuse after neutralization treatment with lime milk, and no wastewater discharge is realized. The invention improves vanadium recovery rate to make it higher than that of available processes, and reduces production cost. By combining with other techniques, the invention also can convert waste resulted from extraction into secondary resource for reuse, so as to realize clean production.

IPC Classes  ?

• C01G 31/02 - Oxides

Abstract

Provided is a clean production method of vanadium oxide, which belongs to the technical field of vanadium oxide extraction, and can not only obtain high quality vanadium product but also circulate and reuse vanadium extraction wastewater. The method comprises preparing raw material to be roasted, calcifying roasting, leaching, solid-liquid separating, vanadium precipitating with ammonium salt, and removing ammonia by calcination or reducing to prepare vanadium oxide; where vanadium extraction wastewater is returned to the system for circulation and reuse after neutralization treatment with lime milk, and no wastewater discharge is realized. Vanadium recovery rate is improved, and production cost is reduced. By combining with other techniques, the method can also convert waste resulted from extraction into secondary resource for reuse, so as to realize clean production.

IPC Classes  ?

• C01G 31/02 - Oxides

Abstract

Provided is a process for producing titanium tetrachloride using low-grade titanium raw materials. The process comprises adding the low-grade titanium raw materials into a furnace, heating the furnace to 420±40℃, continuously adding the low-grade titanium raw materials, feeding chlorine into the furnace to begin the reaction, controlling the temperature of the furnace at 600℃-700℃, collecting the gases containing titanium tetrachloride generated in the reaction, condensing the gases to obtain a titanium tetrachloride liquid and a tail gas, taking the reacted inert chlorination residues out of the furnace depending on the amount of the materials being added, and processing and discharging the remaining residue when the reaction is completed. The content of titanium carbide in the low-grade titanium raw materials is 6%-16%, and preferably 7%-12%.

IPC Classes  ?

• C01G 23/02 - Halides of titanium

Abstract

The present invention discloses a method for producing metal vanadium, which comprises the following steps: vanadium oxide and elemental carbon reducing agent are used as starting materials, which are mixed to yield a mixture in a stoichiometric ratio for reacting the vanadium oxide and the elemental carbon reducing agent to form VCmOn and CO, wherein 0 < m ≤ 1, 0 < n ≤ 1, m ≤ n, and the mixture is molded by pressing. The molded mixture reacts in a temperature range of 800-1600 ºC to form VCmOn with an electrically conductive property. By using the VCmOn as a consumable anode, an electrically conductive material as a cathode, and a molten salt system of alkali metal halide, alkaline earth metal halide or the combination thereof as an electrolyte, an electrolytic cell is formed. The electrolysis is performed in a temperature range of 400-1000 ºC. During the electrolysis, the carbon and oxygen contained in the consumable anode are released as CO, CO2 or O2, and vanadium is provided as ions to the electrolyte and deposited at the cathode to yield metal vanadium.

IPC Classes  ?

• C25C 3/26 - Electrolytic production, recovery or refining of metals by electrolysis of melts of titanium, zirconium, hafnium, tantalum or vanadium

Abstract

Provided is a hot-galvanized steel sheet with high adhesion between the coating and the steel substrate, it belongs to hot-galvanized steel sheet manufacturing field. The atomic concentration ratio Al/Zn of Al to Zn in the Fe-Al intermediate layer between the steel substrate and the zinc coating of the hot-galvanized steel sheet is 0.9~1.2. Г phase is not formed in the coating, δ phase is thinner, ξ phase is very little, and a major portion of the coating is comprised of η phase, the adhesion, scratching resistance and wear resistance of the coating are significantly improved.

IPC Classes  ?

• C23C 2/06 - Zinc or cadmium or alloys based thereon
• C23C 2/40 - PlatesStrips

Abstract

The present invention provides a method for preparing metallic titanium by electrolyzing molten salt with titanium circulation. The method mainly comprises reducing titanium tetrachloride (TiCl4) to at least one of titanium trichloride (TiCl3) and titanium dichloride (TiCl2) in chloride molten salt by metallic titanium (Ti), and electrolyzing the at least one of TiCl3 and TiCl2 in the chloride molten salt to form metallic titanium. According to the method for preparing metallic titanium of the present invention, TiCl2, and/or TiCl3 are prepared and electrolyzed continuously without changing the surrounding medium, thereby simplifying process flow, reducing power consumption, and realizing industrialization.

IPC Classes  ?

• C22B 34/12 - Obtaining titanium
• C25C 3/28 - Electrolytic production, recovery or refining of metals by electrolysis of melts of titanium, zirconium, hafnium, tantalum or vanadium of titanium

Abstract

A high carbon content and high strength heat-treated steel rail including by weight 0.80-1.20% carbon, 0.20-1.20% silicon, 0.20-1.60% manganese, 0.15-1.20% chromium, 0.01-0.20% vanadium, 0.002-0.050% titanium, less than or equal to 0.030% phosphorus, less than or equal to 0.030% sulfur, less than or equal to 0.0 10% aluminum, less than or equal to 0.0100% nitrogen, and iron. The steel rail has excellent wear resistance and plasticity and can satisfy the requirement for overloading. A method for producing the steal rail by heating a bloom to a heating temperature, multi-pass rolling, and accelerated cooling, wherein a maximum heating temperature (.degree.C) of the bloom is equal to 1,400 minus 100[%C], [%C] representing the carbon content (wt.%) of the bloom multiplied by 100.

IPC Classes  ?

• C22C 38/22 - Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
• C22C 38/24 - Ferrous alloys, e.g. steel alloys containing chromium with vanadium
• C22C 38/28 - Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese