62results about How to "Reduce vanadium content" patented technology

The invention relates to a catalysis conversion method for producing aromatic compounds. According to the method, poor quality heavy cycle oil and residual oil are subjected to a hydrotreating reaction in the presence of hydrogen gas and a hydrogenation catalyst, and the reaction products are separated to obtain gas, naphtha, hydrogenated diesel oil and hydrogenated residue oil, wherein the hydrogenated diesel oil enters a catalysis cracking device and is subjected to a cracking reaction in the presence of a catalysis cracking catalyst, the reaction products are separated to obtain dry gas, liquefied gas, catalytic gasoline containing rich benzene, toluene and xylene, catalytic light diesel oil, distillates with a distillation range of 250-450 DEG C, and an oil slurry, and the distillates with the distillation range of 250-450 DEG C are conveyed to a residue oil hydrotreating device so as to be recycled. According to the present invention, the residue oil hydrogenation condition is completely utilized to achieve saturation of the aromatic ring in the poor quality heavy cycle oil to the maximal degree, such that the hydrogenated diesel oil maximally produce benzene, toluene and xylene during catalysis cracking.

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 relates to the field of titanium tetrachloride refining and discloses an organic reagent for removing vanadium and a method for removing vanadium from titanium tetrachloride. The organic reagent for removing vanadium comprises saturated fatty acid and unsaturated fatty acid. With the total volume of the organic reagent as the reference, the content of saturated fatty acid is larger than 0 and smaller than or equal to 60% by volume, the content of unsaturated fatty acid is larger than or equal to 40% by volume and smaller than 100% by volume, the chain length of saturated fatty acid ranges from C5 to C9, and the chain length of unsaturated fatty acid ranges from C10 to C30. The organic reagent for removing vanadium is high in vanadium removing speed, good in effect and small in quantity of generated residues.

A carried vanadium catalyst is prepared from activated carbon or gamma-Al2O3, vanadium and assistant through pulverizing activated carbon or gamma Al2O3 by 20-80 meshes, preparing the solutions of V precursor and assistant precursor, immersing for 18-36 hr, drying at 110-120 deg.c for 4-6 hrs, calcining at 450-650 deg.c for 4-5 hrs in nitrogen atmosphere and putting in drier. Its advantages are high transform rate of ethylbenzene (more than 60%) and high selectivity to styrene (more than 96%).

The invention discloses a method and a system for removing vanadium impurities in titanium tetrachloride. The system is composed of a crude titanium tetrachloride feeding tank, a feeding pump I, a forced circulating pump, a forced circulating pump groove, a heating heat exchanger, a flask tank, a purifying tower, a condensation heat exchanger, a titanium tetrachloride storage tank, a fatty acid feeding tank, a slurry tank and a feeding pump II. The method comprises the steps: adding crude titanium tetrachloride and fatty acid into the forced circulating pump groove; then, adding the crude titanium tetrachloride and the fatty acid into the heating heat exchanger to carry out reduction reaction to obtain titanium tetrachloride slurry, wherein the titanium tetrachloride slurry contains suspended dichlorooxovanadium solids; enabling the titanium tetrachloride slurry to enter the flask tank, and carrying out flask separation; discharging dichlorooxovanadium solid contained slurry into the forced circulating pump groove, and enabling gaseous titanium tetrachloride to enter the purifying tower; and discharging the dichlorooxovanadium solid contained slurry in the purifying tower into the forced circulating pump groove, and enabling the gaseous titanium tetrachloride to enter the condensation heat exchanger to obtain the vanadium removed titanium tetrachloride. The method and system disclosed by the invention have the advantages that the equipment scaling and pipeline blocking phenomena are reduced, the productivity is improved, the energy consumption is reduced, the vanadium removal efficiency is high, and the quality of a product is stable.

The invention belongs to the field of metallurgy, and particularly relates to a preparation method of high-quality vanadium-aluminum alloy. The preparation method comprises the following steps: by an electrothermal reduction-two-step refining method, using V2O3 with the purity of 99.9%, Al with the purity of 99.70% and CaO with the purity of 97.0% as raw materials, uniformly mixing, taking a part of the raw materials, and mixing with a heating agent as a base material; igniting the base material to form a molten pool, starting an open arc for smelting, and adding the remaining raw materials in batches; in the later reacting stage, performing blowing refining on the alloy and molten slag; after completion of smelting, deslagging, and casting to obtain the vanadium-aluminum alloy. According to the preparation method, high-purity V2O3 is used as a vanadium source, so that compared with use of V2O5, the using amount of a reducing agent can be significantly reduced and introduction of impurities into the raw materials is reduced; an external heat source can prolong the heat-preserving time so as to promote separation of the slag and the alloy; the open arc is started for smelting by virtue of the molten slag, so that the carbon content of the alloy can be reduced; in the later smelting stage, the recycling rate is increased and the impurity content is reduced by refining the slag and the alloy. The final impurity content meets a standard of the AlV50 vanadium-aluminum alloy of the German GfE company.

The invention belongs to the field of metallurgy, and relates to a spray blowing method in smelting of iron-vanadium alloy. A technical scheme for solving the technical problem is as follows: a, adding the batch mixed smelting raw materials containing V2O5 and V2O3 into a smelting furnace in batches, powering on the smelting furnace, and smelting; b, spray blowing after the smelting is ended, wherein a spray blowing material is a mixture of aluminum powder and vanadium-iron fine powder; and c, continuously electrifying and refining after the spray blowing is ended. By adopting the method, the spray blowing efficiency is improved, the content of vanadium in the vanadium-iron smelting slag is reduced, and the yield of smelting vanadium is increased.

The invention belongs to the fields of metallurgy and solid waste comprehensive utilization, and in particular relates to a method for extracting vanadium in vanadium-containing steel slag tailings. The invention aims at providing a high-yield and stable process for recovering vanadium and iron in steel slag for comprehensive utilization, value improvement and vanadium resource recovery of low-vanadium steel slag, wherein recovery rates of both vanadium and iron are above 90%. The process comprises steps of A, preparing materials: combing raw material low-vanadium steel slag tailings with an auxiliary material A and a load vector B, wherein the low-vanadium steel slag tailings account for 40-65%, the auxiliary material A accounts for 14-20% and the load vector B accounts for 15-46%; B, reducing and melting various materials in a submerged arc furnace to obtain low-vanadium pig iron and reduced water slag; and C, hot-charging the low-vanadium pig iron obtained from the step B under a liquid status to a converter, adding a coolant C, and implementing oxygen blowing vanadium extraction to obtain vanadium slag and semi-steel. The vanadium extracting process adopts many waste materials in whole using process, and is short in flow, short in time, high in vanadium recovery rate, free from newly generated solid waste, free from discharge of tailings, and energy-saving, and the environment is protected.

The invention discloses a vanadium extracting method, which comprises the following steps that: vanadium slag is adopted as a raw material, and the vanadium slag is subjected to sodium-salt-added roasting, water leaching and impurity removing so as to obtain a sodium metavanadate solution; the obtained sodium metavanadate solution is subjected to adjusting acid, adding ammonium salt to precipitate vanadium and filtering so as to obtain poly ammonium vanadate; and the obtained poly ammonium vanadate is prepared into V2O5 powder through thermal decomposition. According to the vanadium extracting method disclosed by the invention, a vanadium resource in the vanadium slag can be effectively recycled.

The invention discloses a titanium-contained composite alloy reinforcing core-spun yarn and application to HRB400E thread steel. The titanium-contained composite alloy reinforcing core-spun yarn is prepared by coating core powder on an aluminum strip; the core powder comprises the following components in percentage by mass: 30-35% of Ti, 22-28% of N, 15-20% of Si, 3-8% of Cu, 8-12% of Mn, 1-3% ofFe, and 5-8% of Zr; and the sum of the components is 100%. The titanium-contained composite alloy reinforcing core-spun yarn is applied to the HRB400E thread steel; in the smelting process of molten steel, after the preparation of white slag is finished from a molten steel tank to an LF station, the titanium-contained composite alloy reinforcing core-spun yarn is fed in the molten steel tank; theyarn feeding speed is 5-6 m/min; the feeding quantity is 3 m/t steel; after yarn feeding, a soft blowing mode is switched to; the bottom blowing argon flow is 150-180 L/min; and the soft blowing timeis 3-5 min. The titanium-contained composite alloy reinforcing core-spun yarn achieves a reinforcing effect of stabilizing titanium in the HRB400E thread steel, replaces a reinforcing effect of part of vanadium, greatly reduces the production cost of the thread steel, and achieves the popularization and application prospect in production of other vanadium-contained steel types.

The invention discloses a crude titanium tetrachloride refining vanadium-removing method, relates to the technical field of production of titanium tetrachloride, and provides the crude titanium tetrachloride refining vanadium-removing method which is high in vanadium-removing speed, good in effect and relatively low in cost. The crude titanium tetrachloride refining vanadium-removing method comprises the following steps: A, enabling crude TiCl4 liquid in a TiCl4 storage tank to enter a refining circulating tower; B, pumping the crude TiCl4 liquid in the refining circulating tower into a heat exchanger through a circulating pump in the tower, and enabling the crude TiCl4 liquid to pass through the heat exchanger to form high-temperature and pressurized crude TiCl4 liquid; enabling the high-temperature and pressurized crude TiCl4 liquid to enter a mixing tube; C, pumping fatty acid in a fatty acid storage tank into the mixing tube, mixing with the high-temperature and pressurized crude TiCl4 liquid, and reacting with impurities in the high-temperature and pressurized crude TiCl4 liquid to obtain a vanadium-removed slurry; D, after a reaction, spraying a mixture from the mixing tube into the refining circulating tower, and performing flash evaporation to vaporize a part of the TiCl4 liquid into TiCl4 vapor; enabling the TiCl4 vapor to enter a condensing system through a tower topsieve plate of the refining circulating tower, condensing and then enabling the TiCl4 vapor to enter a refined TiCl4 storage tank; and returning unvaporized TiCl4 liquid to the lower part of the refining circulating tower, and pumping into the heat exchanger again.

The invention provides a preparation method of high-quality aluminum-titanium-boron alloy rods and belongs to preparation of refiners. The method is characterized by producing aluminum-titanium-boronalloys through cooperation of a frequency-variable induction electric furnace and a medium-frequency induction electric furnace, refining aluminum liquid before charging, adding a mixture of villiaumite and a diffusion agent, taking the mixture as a nucleating agent of TiAl3 and TiB2 mass points in the alloying process, wherein the TiAl3 and TiB2 mass points formed after completing alloying are fine and are more uniformly distributed; the formation of rod shape of the TiAl3 mass points and the aggregation of the TiB2 mass points are eliminated; the diffusion agent is added into the villiaumitemixture, so that the aggregation of the TiAl3 and TiB2 mass points is effectively controlled; the alloying process is equipped with mechanical stirring, so that the enlargement of the TiAl3 and TiB2mass points is effectively prevented; the separation and purification effect of villiaumite slag and alloys can be improved; through check analysis, the TiAl3 and TiB2 mass points in the produced products are fine, are uniform and dispersive in distribution and are extremely low in slag content; the problems that the TiAl3 mass points in the continuously cast and rolled aluminum-titanium-boron alloy rods in the current market are thick and big, the TiB2 mass points are aggregated, the content of the slag in the alloys is high, and the aluminum-titanium-boron alloy rods are poor in refining capacity in the aluminum alloys are effectively solved.

The invention discloses a rectangular ingot for an anti-corrosion mold and a process method of the rectangular ingot, and belongs to the technical field of metallurgy production processes. The rectangular ingot for the anti-corrosion mold is high in strength, and the corrosion resistance, abrasion resistance, creep resistance and fatigue resistance are obviously improved. The process method for producing the rectangular ingot for the anti-corrosion mold is further provided. The rectangular ingot is prepared from, by weight part, 0.25%-0.65% of C, 0.4%-0.8% of Si, 0.4%-0.9% of Mn, 12%-18% of Cr, 0.05%-0.3% of Ni, 0.1%-0.3% of Mo, 0.06%-0.30% of N, not larger than 0.02% of Al, not larger than 0.020% of P, not larger than 0.005% of S and the balance Fe and inevitable impurity elements. The process method comprises the steps of smelting of molten steel with the nitrogen content smaller than or equal to 45 ppm, nitrogen-rich manganese-rich molten steel refining and die casting molding, wherein nitrogen-rich manganese-rich molten steel refining comprises large-slag-amount refining carried out in a refining furnace and secondary refining carried out in a vacuum refining furnace.

The invention discloses a method for separating and enriching vanadium from iron concentrate and producing pure iron. The method comprises the following steps that after vanadium-titanium magnetite ore is pressed into balls and dried, vanadium-titanium magnetite ore pellets are obtained, the vanadium-titanium magnetite ore pellets are directly reduced through a coal based shaft furnace, metallizedpellets are obtained, and the metallized pellets are subjected to melting, separating and enriching in an electric-arc furnace. According to the method, the vanadium recovery rate reaches 93% or above, the vanadium slag grade is about 6-8%, meanwhile, the purity of molten steel obtained through melting and separating is high, the iron content reaches 99.7% of above, in addition, the contents of phosphorus, sulphur, silicon, manganese and titanium in the molten steel are low, and electromagnetic pure iron and military pure iron can be produced through simple refining.

A composition that comprises a titanium compound, an iron compound, and a tungsten compound, wherein the titanium compound has a microcrystalline anatase structure and/or is obtained in the production of TiO2 according to the sulphate process, during hydrolysis of a solution which contains titanyl sulphate, and also in that the composition has a vanadium content, calculated as V, of less than 0.15 wt. % in relation to the solids content of the composition. A catalyst or catalyst raw material containing the claimed composition, as well as to a dimensionally stable and catalytically active solid body can be obtained by mixing the composition defined above with binders, plasticisers and optionally, further additives, molding the obtained composition preferably by extrusion, and subsequently carrying out calcination, or by providing a dimensionally stable and catalytically active solid body that can be obtained by applying the composition, optionally together with binders, plasticisers and further additives, to a substrate, and subsequently carrying out calcination.

The invention discloses low-vanadium nitrogenous hot work die steel and a manufacturing method of the low-vanadium nitrogenous hot work die steel. The low-vanadium nitrogenous hot work die steel comprises, by mass percentage, 0.3%-0.4% of C, 0.2%-0.6% of Si, 0.2%-0.5% of Mn, 4.5%-5.5% of Cr, 1.1%-1.7% of Mo, 0.4%-0.6% of V, 0.02%-0.07% of N, 0.005%-0.03% of Ce, 0.001%-0.006% of Mg and the balance Fe. The method comprises the following steps of (1) smelting molten steel according to the set components, and carrying out nitrogen increasing by adopting a gas-phase nitriding method, and conducting pouring operation; (2) conducting homogenizing operation at the temperature ranging from 1200 DEG C to 1250 DEG C; (3) conducting forging operation; (4) conducting normalizing operation at the temperature ranging from 1000 DEG C to 1100 DEG C; (5) conducting spheroidizing annealing operation; (6) conducting heat preservation at the temperature ranging from 1000 DEG C to 1050 DEG C, conducting oil cooling and accomplishing quenching; and (7) carrying out heat preservation at the temperature ranging from 530 DEG C to 620 DEG C for 2-6 hours twice, and conducting tempering. According to the components of the low-vanadium nitrogenous hot work die steel, the content of vanadium and the content of silicon are reduced, the proper amount of nitrogen is added, the trace amount of rare earth and the trace amount of magnesium are cooperatively added, the cleanliness of the steel is improved, the carbide distribution effect is improved, and finally the performance of the die steel is improved.

The invention belongs to the technical field of hydrometallurgy of vanadium, and particularly relates to a method for preparing high-density ammonium polyvanadate by calcified roasting pickle liquor through heat preservation. The method aims at the problems of low density and the like of ammonium polyvanadate which is a vanadium precipitation product of the calcified roasting pickle liquor of vanadium slags. The method for preparing the high-density ammonium polyvanadate comprises the following steps that a. the calcified roasting pickle liquor of the vanadium slags is taken, the pH value is regulated to 2.2 - 3.8, and the temperature is regulated to be 20 DEG C - 75 DEG C, the concentration of NH4<+> is controlled to be 0.22 - 0.44 time of the concentration of vanadium in the pickle liquor; b, the pH value of the liquor is adjusted to 1.7 - 2.1, the temperature is regulated to be 83 DEG C-91 DEG C, and heat preservation is carried out for 60 min - 90 min under the stirring condition;c, after heat preservation is finished, the temperature is raised till the liquor is boiled, and reaction is carried out; and d, solid-liquid separation, washing and drying are carried out to obtain the high-density ammonium polyvanadate. According to the method for preparing the high-density ammonium polyvanadate by the calcified roasting pickle liquor through heat preservation, the ammonium polyvanadate with the density being 0.5 g/cm<3> or above is prepared from the calcified roasting pickle liquor of the vanadium slags, the density is increased by two times compared with an existing method, and meanwhile, vanadium in the pickle liquor is fully recycled, so that economic benefits are remarkable.

The invention relates to a method for controlling the content of vanadium in chromium sesquioxide, belongs to the technical field of vanadium and chromium metallurgy, and solves the technical problemsof complicated process for preparing low-vanadium-content chromium sesquioxide products and high cost in the prior art. In the method for controlling the content of vanadium in chromium sesquioxide,vanadium and chromium contained solution is reduced, and the pH of the solution is adjusted within 7-9, so that tetravalent vanadium and trivalent chromium are precipitated to obtain vanadium-contained rough hydrogen chromium oxide; finish hydrogen chromium oxide is obtained through pulping, washing and control of the Na2O content within 3.5-6%; and finally, chromium sesquioxide with lower vanadium content is obtained by calcining, crushing, pulping and washing. The method omits special vanadium removing process, reduces the consumption of energy and reagents needed in the vanadium removing process, simplifies the process, and reduces the cost.

The invention discloses a method for recovering vanadium from vanadium precipitation waste water, which comprises the following steps: 1)adjusting pH value of vanadium precipitation waste water to be acidic; 2)adding C1-C4 alcohol to vanadium precipitation waste water in the step 1), performing a first contact reaction under stirring condition; and 3)adding a surfactant shown in a step 1) to the vanadium precipitation waste water in the step 2), performing a second contact reaction under stirring condition, then performing solid-liquid separation on the product. The method can be characterized in that the surfactant is added for changing the property of the vanadium precipitation waste water, and sediment can be formed by directly combining with vanadium, total vanadium content in vanadium precipitation waste water is reduced from 0.05-5g/L to 0.001-0.005g/L, vanadium precipitation rate can reach more than 99%, the method can be carried out at low temperature in short time, operation is simple, and the method has the advantages of energy consumption saving and cost saving, and has good social benefit and economic benefit. Wherein, R is C10-C18 long chain alkyl, R1-R3 is methyl or ethyl, and X is Cl, Br or I.