38results about How to "Rapid deoxygenation" patented technology

The invention relates to a microwave-assisted method for preparing graphene through reduction of sodium citrate. The microwave-assisted method comprises the following steps in sequence: dispersing 0.05 to 0.3g of graphite oxide prepared by an improved Hummers method into 200ml of deionized water; ultrasonically dispersing for 40 to 80 minutes at the power of 210 to 300W; adding 1 to 30g of sodium citrate; uniformly stirring; transferring the mixture into a microwave reactor with rated output power of 1000W; setting the reaction temperature to 70 to 95 DEG C to react for 60 to 300 seconds at the stirring speed of 600rpm / min; cooling to reach room temperature; centrifugally cleaning more than three times under centrifugal speed more than 13000rpm / min; and refreezing and drying the black solid at the lower layer, thus obtaining the graphene. The microwave-assisted method has the fast, environment-friendly and energy-saving characteristics, can be carried out to prepare the graphene which is uniform in size distribution and excellent in electrical properties, and can provide technical guarantee to the application of the graphene.

The invention discloses a hydrogen plasma deoxidation method for chromium powder. The hydrogen plasma deoxidation method is characterized by comprising the following steps: selecting a metal chromium block and crushing the metal chromium block into chromium powder of -325 to -1340 mesh; carrying out hydrogen plasma deoxidation on the chromium powder, wherein the deoxidation is carried out in a stainless steel container with radio-frequency hydrogen plasma equipment, the radio-frequency hydrogen plasma equipment takes hydrogen gas as a working gas, and a slotted water-cooling copper furnace is arranged in the stainless steel container; firstly, manufacturing the chromium powder subjected to ball grinding into a plurality of chromium powder rod bodies, each of which having a diameter of 15-20mm and a length of 20-3mm, preparing a plurality of chromium powder rod bodies from chromium powder subjected to ball grinding by arc melting in the presence of argon gas at 0.02-0.05Mpa, and then connecting every two chromium powder rod bodies end to end and placing on the slotted water-cooling copper furnace; feeding gas through the radio-frequency hydrogen plasma equipment; manufacturing chromium rods in an once forming manner through a zone-melting method so as to finish deoxidation. The hydrogen plasma deoxidation method is used for carrying out chromium powder deoxidation by using the radio-frequency plasma equipment and is simple in process and low in cost, and the oxygen content of the product can accord with using requirements.

The invention discloses a method for quick deoxidization in the smelting process of a ladle furnace (LF). The method comprises the following steps: (1) adding aluminum iron containing 40% of aluminumat a time after molten steel enters the ladle furnace (LF), so that the aluminum content in the molten steel reaches 0.04%-0.05%, and adding 150 kg of low aluminum slag balls, and 2-2.5 kg of active lime per ton of steel; (2) powering on and slagging, powering on for 3-5 times, adding 0.2 kg of molten steel deoxidizing agents per ton of steel, powering on for 5 min, melting top slag, and then powering off; (3) adjusting argon gas flow such that the diameter of the slag face blown by argon gas is 450-500 mm, adding 1-1.5 kg of the low aluminum slag balls per ton of steel, and 0.4 kg of the molten steel deoxidizing agents per ton of steel, stirring the mixtures for 15-20s, and then adding 1-1.5 kg of the low aluminum slag balls per ton of steel and 0.4 kg of the molten steel deoxidizing agents per ton of steel if the deoxidization effect is poor; stirring the mixtures for 15-20s, till the section of the top slag is yellowish white, namely that the deoxidization is finished; and adjustingthe argon gas flow to 100-150 L / min in time, and performing subsequent operation. According to the method disclosed by the invention, not only the quick deoxidization of molten steel in the smeltingprocess is achieved, the output of inclusions in the smelting process is reduced, and the quality of steel billets is improved, but also the thermal efficiency in the power-on heating process is improved, and the power consumption and slag consumption are reduced.

The invention discloses a fixed bed coal seam gas non-catalytic deoxidization method and a fixed bed coal seam gas non-catalytic deoxidization device. The device comprises a fixed bed coal seam gas deoxidization device body including a furnace body (1), wherein the side wall of the furnace body (1) is provided with a water jacket (2) enclosing the side wall of the furnace body; the upper part of the water jacket (2) is connected with an air inlet of a steam pocket (23) through a pipeline; and a water inlet pipe on the lower part of the water jacket is connected with a water outlet of the steam pocket (23). The device deoxidizes the coal seam gas, can effectively control the deoxidization temperature and reduce the oxygen content in the coal seam gas to less than 0.5 percent, and maximallyreduces methane decomposition to make the methane loss less than 5 percent.

The invention relates to a special desoxidant for petroleum tube steel. The desoxidant is characterized by being prepared from the following components in percentage by weight: 22-33 percent of Al, 28-43 percent of Al2O3, 0.1-3 percetn of SiO2, 0.1-2 percent of C, 0.1-0.3 percent of water-insoluble adhesive, 5-18 percent of an additive and the balance of Fe, wherein the granularity of Al and Al2O3 is not more than 5mm. The desoxidant can be used for achieving the effects of quickly deoxidizing, adsorbing impurities, shortening melting time, reducing electricity consumption for melting and greatly reducing melting cost, and can meet the special requirement for steels for petroleum tubes.

The invention relates to a pollution-free molten slag deoxidization method capable of adjusting anode oxygen partial pressure and a device thereof, and belongs to the technical field of metallurgical refining process. In the method, molten steel or molten metal is deoxidized and purified by the special device. In the method, the molten slag is taken as electrolyte, a deaeration cavity electrode inserted into the molten slag is taken as an anode, and the molten steel or the molten metal is taken as a cathode; the deaeration electrode is provided with an electrode cavity and is communicated with a vacuum chamber by a conduit; an applied DC power supply exerts direct current impulse voltage so that an electric field is formed between the molten steel or the molten metal and an oxygen electrode of the molten slag, and the conduction of oxygen ions in a molten slag system and mass transfer of dissolved oxygen in the molten steel are controlled by controlling a current value and a voltage value of the DC power supply as well as components of the molten slag. The oxygen is diffused from the molten slag to the electrode cavity and discharged by an air exhaust system by controlling the oxygen partial pressure of the electrode cavity.

The invention discloses a fixed-bed coal seam gas non-catalytic deoxygenation device and method.The device comprises a fixed-bed deoxygenation furnace, wherein a sidewall and conical top of a furnace body are provided with a water jacket surrounding the sidewall and the conical top; the upper portion of the water jacket at the conical top is connected with a water inlet of a steam drum, and the bottom of the water jacket is connected with a water outlet of the steam drum; a circular coal seam gas pipe and a water spray pipe are arranged in the furnace body.By using the device to deoxygenate coal seam gas, H2 produced in coal pyrolysis and water gas reaction is made full use in deoxygenation, the coal seam gas enters the furnace body through upper and lower paths, coal seam gas treatment quantity is high, deoxygenation temperature is effectively controlled, oxygen content of the coal seam gas is decreased to below 0.5%, methane splitting can be reduced maximally, and methane loss is below 5%.

The invention relates to a magneto-thermal field synergistic oxygen-enriched air generating device, which is characterized in that a casing is a stage tubular body or a column tubular body, an upper cover with an air outlet a is arranged on upper end of the casing, a base is arranged at lower end of the casing, permanent magnets with magnetic shoes are circumferentially and evenly arranged in thecasing, polarities of adjacent and opposite permanent magnets are different, an air inlet b is arranged between the lower part of lateral side of the casing and the permanent magnets, a clearance which is communicated with the air inlet b is retained between adjacent permanent magnets and magnetic shoes, forming a convergence type air inlet channel which is communicated with the air inlet b from the external to the internal; lateral side of radial direction of the permanent magnets is at the same plane with the lateral side of radial direction of the magnetic shoes, a convergence type air outlet channel is formed from the upper part to the lower part among the circumferentially adjacent permanent magnets, adjacent and opposite magnetic shoes in the casing, a heater is arranged at the air outlet a of the upper cover in the casing and an air negative ion generating device is arranged on the base in the casing. The oxygen-enriched air generating device has the advantages that the device can be used for indoor oxygen-enriching and ventilating and can also be used as the oxygen-enriched source of combustion as well as oxygen-charging source of water body.

The invention discloses an arc furnace steel-making method capable of effectively preventing steel part surface from cracking. The method improves smelting technology, uses carborundum as deoxidant for reduction for arc furnace steel making, combines a packet cutting-in method, and adopts yttrium base heavy rare earth ferro-silicon alloy to purify molten steel. The method comprises the steps of reducing, deoxidizing, sampling, purifying molten steel with the packet cutting-in method and pouring. The method provided by the invention can effectively reduce cast steel surface cracking phenomenon, improves the quality and the production efficiency of the cast steel, is an innovation of production technology and industrial application effect, and can make contribution for improving the comprehensive economic benefit of arc furnace steel making.

The invention discloses a cast steel deoxidized alloy and a processing method and a use method of the cast steel deoxidized alloy, and belongs to the field of cast steel molten steel smelting. The deoxidized alloy comprises, by mass percent, 15-25% of Re, 8-20% of Ca, 5-15% of Ba, 5-20% of Ti, 5-20% of Zr, 5-20% of Si, 0.5-3% of Mg and the balance Fe. The deoxidized alloy is prepared by adopting afusion casting method, the fusion casting method is suitable for casting ordinary carbon steel, alloy steel, stainless steel and other cast steel, the content of oxygen in the cast steel can be effectively reduced, the harmful effects of oxygen on the content of the cast steel are reduced, and the cast steel product quality is improved.

The invention belongs to the technical field of iron and steel metallurgy and discloses slag for deoxidization and applicable to silicon-killed steel. The slag for the deoxidization and applicable tothe silicon-killed steel is prepared from the following components in percentage by mass: 30 to 45 percent of CaO, 30 to 40 percent of SiO2, 10 to 30 percent of Si, 2 to 5 percent of C, less than or equal to 5 percent of Al, less than or equal to 5 percent of Al2O3, less than or equal to 0.1 percent of S and less than or equal to 0.05 percent of P; the ratio of WCaO / WSiO2 is 0.9 to 1.2, wherein WCaO is the mass percent of the CaO in the slag and WSiO2 is the mass percent of the SiO2 in the slag. The invention further provides a preparation method of the slag for the deoxidization and applicable to the silicon-killed steel. The slag for the deoxidization, provided by the invention, is a whole pre-melted material, so that the components are uniform, the melting point is low and the melting time is short. When the slag is used in a factory, rapid deoxidization and rapid slag formation are facilitated.

The invention relates to a white slag refining agent for an LF (Ladle Furnace) refining furnace, belonging to the technical field of steel making, in particular to the technical field of ladle slag modification treatment of the LF refining furnace. The invention aims to provide the white slag refining agent which has the advantages of low cost and strong inclusion adsorption capacity. The white slag refining agent for the LF refining furnace is characterized by comprising the following components in percentage by weight: 40-50 percent of calcium carbide, 8-14 percent of fluorite, 24-30 percent of limestone, 4-6 percent of bauxite and 4-12 percent of dolomite. The white slag refining agent has the advantages of low cost and wider application range and is suitable for a non Al deoxidized steel (a kind of steel, strictly controlling the aluminum content), for example. After being added into the LF refining furnace, the white slag refining agent can fulfill the functions of rapid deoxidation and white slag production and can enable the content of FeO and MnO in ladle slag to be no more than 1.5 percent to satisfy the smelting needs of high-grade steels.

The invention relates to a method for refining and deoxidizing low-carbon and low-silicon welding wire steel. The specific steps are as follows: 1) deoxidizing and alloying molten steel by tapping out of a converter; For deoxidation, add ferrosilicon powder for deoxidation. By optimizing the refining deoxidation method, the clogging of the continuous casting nozzle is solved, and the problem of subcutaneous air bubbles of the continuous casting slab is reduced.