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1232 results about "Deoxidization" patented technology

Deoxidization is a method used in metallurgy to remove the oxygen content during steel manufacturing. In contrast, antioxidants are used for stabilization, such as in the storage of food. Deoxidation is important in the steelmaking process as oxygen is often detrimental to the quality of steel produced. Deoxidization is mainly achieved by adding a separate chemical species to neutralize the effects of oxygen or by directly removing the oxygen.

Liquid hydrocarbon mercaptan removal technique capable of deeply removing total sulfur

The invention relates to a liquid hydrocarbon mercaptan removal technique capable of deeply removing total sulfur, in particular to a sweetening technique for liquefied gas in an oil refinery. The oil refining liquid hydrocarbon refers to components of liquefied gas and light gasoline, wherein the liquefied gas is a raw material for producing MTBE, and the light gasoline is a component for producing high-cleanness gasoline. In order to solve the problem of high total sulfur in the oil refining MTBE and the light gasoline, according to the shape and the distribution rule of sulfocompounds in the liquid hydrocarbon, processes such as functional reinforcement of a recycle solvent, three-phase mixed reinforced regeneration, regenerated catalyst and extractant separation and recycle solvent deoxidization and the like are adopted in the conventional process of liquid hydrocarbon extraction, oxidization and mercaptan removal, so the technical effects of reinforcing the mercaptan removal depth, improving carbonyl sulfide removal rate, and avoiding forming disulphide in the extracting, saving energy and reducing emission and the like are achieved. Thus, the liquid hydrocarbon can be deeply desulfurated, the problem of high total sulfur in the oil refining MTBE and the light gasoline is solved and the slag discharging quantity in the conventional process is greatly reduced.
Owner:HEBEI REFINING TECH CO LTD

Smelting process of high-carbon bearing steel

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.
Owner:ZENITH STEEL GROUP CORP +1

High-grade non-oriented silicon steel with excellent magnetism and smelting method for high-grade non-oriented silicon steel

InactiveCN102796947ADeteriorating purityAvoid NitrogenSlagFerrosilicon
The invention discloses a method for smelting high-grade non-oriented silicon steel with excellent magnetism. The method comprises the following steps of: 1) smelting, namely smelting the following chemical components: less than or equal to 0.005 weight percent of C, 2.6 to 3.4 weight percent of Si, 0.2 to 0.5 weight percent of Mn, less than or equal to 0.2 weight percent of P, less than or equal to 0.005 weight percent of S, 0.3 to 1.6 weight percent of Al, less than or equal to 0.005 weight percent of N, less than or equal to 0.005 weight percent of O, less than or equal to 0.0015 weight percent of Ti, and the balance of Fe and inevitable inclusions, and modifying ladle top slag in the tapping process of a converter so as to ensure that the ladle top slag comprises 30 to 37 weight percent of CaO, 7 to 20 weight percent of SiO2, 35 to 45 weight percent of Al2O3, 5 to 9 weight percent of MgO, and 0.6 to 2.6 weight percent of T.Fe+MnO when the Ruhrstahl-Heraeus (RH) refining treatment begins; 2) performing RH refining, namely deoxidizing by using ferrosilicon when the decarburization of the RH refining is finished, wherein the adding speed of the ferrosilicon is less than or equal to 12.5kg/ton/min; and 3) adding 0.5 to 2.0 kg of calcium alloy into each ton of molten steel for the denaturation control of inclusions after the deoxidization and alloying are performed through the RH refining.
Owner:BAOSHAN IRON & STEEL CO LTD

Double distribution plate coal-base serial fluidized-bed chemical chain combustion apparatus

The invention belongs to the gas-solid fluidized bed reactor field and relates to a dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus suitable for the chemical-chain combustion of burning coal and other solid fuels; the bottom of a bubbling fluidized bed is provided with a gas inlet and a feed port; the inside of the bubbling fluidized bed is divided into three regions by two distributing plates; the bottom of a low gas velocity region and the bottom of a high gas velocity region are respectively provided with a distributing plate; the middle between two regions is provided with a transition region with a reduce section to realize different gas flow velocities in the low gas velocity gasification region and the high gas velocity deoxidization region; the upper part of a bubbling fluidized bed is in tubular communication with the upper part of a cyclone separating device; the top of the cyclone separating device is provided with an exhaust port which is communicated with a gas inlet of the bubbling fluidized bed; the lower part of the cyclone separating device is pumped to the low gas velocity gasification region by a feed leg; the bottom of the high gas velocity deoxidization region is communicated with a circulating fluidized bed by a feed returning device; the bottom of the circulating fluidized bed is provided with an air inlet; the upper part of the circulating fluidized bed is communicated with the cyclone separating device. The dual-distributing plate coal-based serial fluidized bed chemical-chain combustion apparatus has the advantages of low cost, flexible operation, high thermal efficiency, wide application range, etc.
Owner:QINGDAO UNIV OF SCI & TECH

Method for preparing antibacterial composite material with nano silver particles evenly dispersed in polymeric matrix

The invention discloses a method for preparing an antibacterial composite material with nano-silver particles evenly dispersed in a polymeric matrix, which belongs to technique for preparing antibacterial nano composite materials and comprises the following steps: preparing styrene/methyl methacrylate hybrid monomers, a sodium dodecyl sulfate hybrid monomer solution, a silver nitrate aqueous solution and a trisodium citrate aqueous solution; mixing the silver nitrate aqueous solution and the trisodium citrate aqueous solution with the sodium dodecyl sulfate hybrid monomer solution according to a volume ratio to obtain a micro-emulsion containing silver nitrate and a micro-emulsion containing trisodium citrate; stirring and mixing the two micro-emulsions to obtain a stable micro-emulsion having hybrid monomers of continuous phases and containing the nano-silver particles; and then dispersing the emulsions in distilled water to prepare a common emulsion, introducing nitrogen for deoxidization, adding an initiator to perform emulsion polymerization reaction, using sodium chloride to perform emulsion-breaking and separation on the product, fully washing the product with deionized water, and soaking the product in ethanol, and drying the product to constant weight so as to obtain the antimicrobial nano-silver/poly(styrene-methyl methacrylate) composite material. The method has simple preparation processes and can make the nano-silver particles evenly dispersed in the polymer matrix, and the prepared composite material has broad-spectrum bactericidal property, and has high fatality rate to Escherichia coli, bacillus subtilis, staphylococcus aureus and pseudomonas aeruginosa in 24 hours.
Owner:HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY

Non-oriented silicon steel RH refinement and deoxidation control method

InactiveCN101768653APrecise deoxygenation controlWide process applicabilityMolten steelOxygen content
The invention discloses a non-oriented silicon steel RH refinement and deoxidation control method. The method includes the following steps that firstly, the non-oriented silicon steel includes the following mass percent of smelted components: less than or equal to 0.005 percent of C, 0.25-2.5 percent of Si, 0.10-0.50 percent of Mn, less than or equal to 0.08 percent of P, less than or equal to 0.005 percent of Al, less than or equal to 0.008 percent of S, less than or equal to 0.003 percent of N, and the rest percent of Fe and unavoidable impurities; secondly, the smelted molten steel is processed by the RH refinement method and when the RH refinement begins, the molten steel temperature is higher than the melting point of steel by 60-150 DEG C and the carbon content of the molten steel is controlled within 0.02-0.06 percent which refers to mass percent; when decarbonization in RH refinement is ended, the free oxygen content in the molten steel is 250-550ppm; deep deoxidization is made after decarbonnization, and the input amount of the deoxidizing agent Y = K * (The oxygen concentration at the end of decarbonization (ppm)-50), wherein, the deoxidization agent is aluminum, silicoferrite or threadlike carbon. The invention has the advantages of reducing the impurity quantity in the steel, changing the morphology, realizing the deoxidized refinement control in the RH refinement process and improving the product performance.
Owner:BAOSHAN IRON & STEEL CO LTD

Low-carbon low-silicon high-quality carbon structural steel and production method thereof

The invention discloses a low-carbon low-silicon high-quality carbon structural steel and a production method thereof. The structural steel comprises the following chemical components in percentage by weight: less than or equal to 0.06% of C, less than or equal to 0.03% of Si, 0.35-0.50% of Mn, less than or equal to 0.018% of P, less than or equal to 0.012% of S, 0.005-0.025% of Als, and the balance of Fe and residual elements. The production method disclosed by the invention comprises the following steps: KR (knotted reactor) hot metal pretreatment of high-quality hot metal, processing with a top-bottom combined blowing converter, pre-deoxidization of molten steel, alloying of molten steel, final deoxidization process of molten steel, argon blowing process, continuous casting and casting blank stack cooling. In order to ensure the high quality of molten steel smelted with converter, the good quality of raw and auxiliary materials used in the converter smelting process must be guaranteed, wherein the raw and auxiliary materials include hot metal, waste steel, lime, light-burnt magnesium ball, ore, alloy, deoxidizer, aluminum wire, refining slag, calcium carbide, fluorite and covering agent. The invention has the advantages of simple process, strong adaptability and relatively low cost.
Owner:NANYANG HANYE SPECIAL STEEL CO LTD

Method for producing base oil of lubricating oil by using Fischer-Tropsch synthesis wax

The invention relates to a method for producing base oil of lubricating oil by using Fischer-Tropsch synthesis wax. The method comprises the following steps of: (a) enabling the Fischer-Tropsch synthesis wax to be in contact with a hydrofining catalyst in a hydrofining reaction region I to obtain the Fischer-Tropsch synthesis wax subjected to hydrogenating alkene saturation and deoxidization; (b) enabling the Fischer-Tropsch synthesis wax obtained in the step (a) to be in contact with a hydrogenating isomerization catalyst in a wax hydrogenating conversion reaction region A to obtain wax converting generation oil with depression of pour point; (c) enabling the wax converting generation oil obtained in the step (b) to be in contact with the hydrogenating isomerization catalyst in a wax hydrogenating conversion reaction region B to obtain a wax converting generation oil with further depression of pour point; (d) enabling the wax converting generation oil with further depression of pour point, obtained in the step (c), to be in contact with the hydrofining catalyst in a hydrofining reaction region II to obtain wax converting generation oil subjected to hydrofining; and (e) separating the generation oil obtained in the step (d) in a distillation region to obtain the base oil of the lubricating oil.
Owner:CHINA PETROLEUM & CHEM CORP +1

Method for smelting tire cord steel and method for continuously casting tire cord steel

ActiveCN103060513ARealize clean productionInclusion deformable strongManufacturing convertersIngotOxygen content
The invention discloses a method for smelting tire cord steel and a method for continuously casting tire cord steel; the methods comprise the following steps of: (1), carrying out primary smelting on molten iron or semi-steel by converter top-bottom blowing, and tapping into a steel ladle without deoxidization; (2), carrying out recarburization and pre-alloying on the molten steel in the tapping process, so on the basis of the total weight of the molten steel, the activity oxygen content in the molten steel is 0.004-0.008wt%, the C content is 0.64-0.68wt% and the Al content is less than 0.4wt%; (3), blowing argon to the molten steel in the steel ladle after tapping, and carrying out vacuum refining and alloy fine adjustment; and (4), carrying out ladle furnace refining on the molten steel which is subjected to the vacuum refining by using the manner of bottom blowing argon, adding refining slags batch by batch and adding deoxidizing agents batch by batch, so the total content of FeO and MnO in the steel ladle top slag is less than or equal to 10wt%. In the methods, the tire cord steel is produced by using the technological process consisting of converter primary smelting, vacuum refining and steel ladle furnace refining and cogged ingot continuous casting pouring, and thus the clean production of tire cord steels is achieved.
Owner:PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP

Method for preparing high-titanium iron by step-by-step metal thermal reduction

ActiveCN101967531AResidual amount of Al is reducedEasy to separateDeoxidizationTitanium slag
The invention discloses a method for preparing high-titanium iron by step-by-step metal thermal reduction, which comprises an aluminum thermal reduction smelting step and a reinforced reduction refining step, wherein the raw materials include rutile or high-titanium slag, aluminum powder, iron ore concentrate, slag forming agent and KClO3 in a mass ratio of 1.0: 0.37-0.50: 0.05-0.10: 0.15-0.25: 0.20-0.25, and the smelting temperature is 1,900 to 2,200 DEG C; the reinforced reduction refining time in the second step is 10 to 30 minutes, and after the refining is finished, a high-titanium iron alloy is obtained by cooling, ingot formation and impurity removal; and the composite reducing agent is calcium-magnesium alloy. The method has the advantages of wide raw material source and low production cost; the step-by-step reduction operations are adopted in the method, the reduction smelting of the first step is performed under the condition that the aluminum is insufficient, and the calcium-magnesium alloy composite reducing agent is adopted in the deoxidization refining of the second step, so the Al residue in the high-titanium iron alloy is remarkably reduced, and oxygen is effectively removed; and the transfer of high-temperature melt is realized by casting, and the metal slag separation process is reinforced.
Owner:NORTHEASTERN UNIV

Refining agent for copper and copper alloy smelting

ActiveCN102605193AFacilitate upward flowIncrease surface tensionChemical reactionSilicon dioxide
A refining agent for copper and copper alloy smelting is characterized in that the components of the refining agent are 5 to 15 percent by weight of calcium fluoride, 1 to 5 percent by weight of silicon dioxide, 1 to 5 percent by weight of titanium dioxide, 2 to 10 percent by weight of sodium fluosilicate, 40 to 60 percent by weight of sodium carbonate and the balance sodium tetraborate; the refining agent materials are weighed according to a formula, uniformly mixed, placed into a drying box and dried under 120 DEG C for an hour, and a metallographic inlaying machine is used for manually pressing the refining agent into the shape of a sheet. The refining agent has the advantages that the refining agent is integrated with the functions of deoxidization, degasification, impurity removal and the like, and has strong adsorbing, dissolving and combination slagging capabilities; the surface tension between the refining agent and metal melt is high, the refining agent can promote molten slag to float up, so that the molten slag can be better separated from molten metal, and thereby the effects of refining, impurity removal and melt purification are achieved; the refining agent has high chemical stability and thermal stability, does not have the corrosion effect on metal and the furnace lining, and cannot chemically react with the molten metal, the refining agent and the molten metal cannot be melted into each other as well, and thereby the original composition and properties of alloy are guaranteed; and the refining agent does not have public hazard, is safe and environment-friendly, is convenient to use, and is cheap.
Owner:NANCHANG UNIV

Method for reproducing tobacco leaves by paper-making method through bamboo pulp fibers instead of wood pulp fibers

The invention relates to a method for reproducing tobacco leaves by a paper-making method through bamboo pulp fibers instead of wood pulp fibers and belongs to the field of tobacco leaf reproduction. The method comprises a step a of preparing the bamboo pulp fibers, a step b of preparing a coating solution, a step c of manufacturing paper with pulp on a film base and a step d of preparing the reproduced tobacco leaves by the paper-making method, and particularly comprises the following steps of: boiling aired large dendrocalamus giganteus to prepare bamboo slurry, and carrying out deoxidization treatment to obtain deoxidized bamboo pulp; uniformly mixing 40% of a tobacco stem extract, 55% of fragment / tobacco powder mixed extract and 5% of flavors and fragrances in mass percentage to obtain the coating solution; mixing 45% by mass of tobacco stem residual dreg initially-milled pulp with the beating degree of 8-degree SR and 45% by mass of fragment and tobacco powder mixed residual dregs to obtain the film base; adding 10% by mass of deoxidized bamboo pulp fibers, and mixing uniformly and grinding; preparing the film base after the beating degree is 35-48-degree SR; carrying out conventional coating on the film base prepared by the step c by utilizing the coating solution prepared by the step b, and drying; controlling the water content of a finished product to 10-12%; and slicing for future use. The method disclosed by the invention has the advantages of simple and feasible method and stable quality of the reproduced tobacco leaves.
Owner:YUNNAN RES INST OF TOBACCO SCI
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