132results about How to "Source of reduction" patented technology

The invention relates to a production method for a round steel, and specifically to a preparation method for a sulfur-containing ultra-low titanium high-standard bearing steel. The preparation method comprises a converter smelting procedure, an LF secondary refining procedure, a VD furnace vacuum refining procedure, a bloom continuous casting procedure, and a rolling procedure. Converter smelting is carried out by means of a double-slag process with an endpoint [C] controlled within a range of 0.15% to 0.25%; a double-slag stopping operation with a slag stopping ball and a sliding plate is performed during tapping; a slag skimming treatment is carried out before feeding into the LF; an operation of forming white slag as soon as possible is performed; an appropriate slag layer thickness is ensured before VD; VD vacuum breaking is followed by feeding of a Fe-S wire; an operation of remaining steel and slag is performed at the final stage of steel ladle casting; cold charging is adopted for rolling of a casting blank; and heating time is prolonged appropriately. The sulfur-containing ultra-low titanium high-standard bearing steel produced by means of the preparation method is good in machinability, and extremely high in purity, and has a titanium content controlled within 10 ppm and an oxygen content controlled within 6 ppm; moreover, the steel is good in castability, and has more than 10 continuous casting heats without feeding of a si-ba wire; therefore, high production efficiency is achieved.

The invention belongs to the field of metallurgy and discloses a smelting process of Cr-Mn series spring steel. The smelting process of Cr-Mn series spring steel comprises the following steps: (1) by taking a low-sulfur molten iron and a high-quality steel scrap as the electric furnace smelting iron and steel materials, controlling the electric furnace end point carbon content to greater than 0.15%; (2) adding active lime and composite refining slag in the electric furnace tapping process, and adding calcium carbide to perform pre-deoxidation in the tapping process; (3) feeding an Al line in an argon station before LF refining; (4) producing high basicity white slag in the refining earlier stage and controlling the basicity of slag in the refining middle and later stages to 1.5-2.5; (5) controlling the ultimate vacuum front argon flow to 15-25 L/min and controlling the ultimate vacuum late argon flow to 30-45 L/min; (6) adding a granular alkaline covering agent and a carbonized rice hull to perform double protection by VD emptying; and (7) stabilizing the speed of continuous casting to 0.8-0.9 m/min, and controlling the degree of superheat to 20-30 DEG C. By adopting the process, the non-metallic inclusion content in the molten steel is reduced.

The invention discloses a silt retaining and consolidating method for use in debris flow gully ecological engineering and use thereof. The method comprises: planting a plurality of brush woods for increasing the roughness of the gully bed in a silt transfer area between a debris flow flowing area and a silt settling area in the gully; planting bank-protecting and scouring-preventing forest at the foot of a slope of the gully along the bank of the gully for preventing flowing water from scouring the silt on the bank of the gully; and planting arbor and bush combined improved protection forest in the silt settling area to improve the impact strength of soil body. When the method is used, the use of other civil engineering measures in combination is determined according to the occurrence frequency of debris flow. Compared with the prior art, the method can effectively retain, consolidate and improve the silt in the silt transfer area, on the gully slope and in the silt settling area in the debris flow gully, consolidate and improve retained and deposited silt while reducing silt sources, improve the self-stability of the silt soil body in the silt settling area, strengthen the sand control capability of the gully and improve the landscape of the gully.

The incinerator, the gasifying pyrolysis stove as well as the dust removal and fume extractor are utilized in the invented equipment. The incinerator, the pyrolysis gasifying stove and the collector for cracked gas are integrated as whole body. The furnace body of the gasifying pyrolysis oven is divided into a stove chamber and a cracking chamber. The exit of the chain on the bottom of the cracking chamber is connected to the incinerator through a channel. Cracked coke can pass through two windshields in the channel, but fume and frame produced in the incinerator cannot enter into the stove. Thus, gasifying pyrolysis effect is happened in the stove without burning on. Garbage is decomposed into cracked coke, which will be burning in the incinerator, and cracked gas, which will be filteredout. The beneficial effect is that if burning these gases, dioxin will be produced. The combustible gas generated in the stove is as the fuel for the incinerator.

The invention discloses a self-cleaning method of an air conditioner heat exchanger and an air conditioner. The air conditioner comprises the heat exchanger and heating parts. The heating parts are arranged to correspond to the heat exchanger. The self-cleaning method of the air conditioner heat exchanger comprises the following steps that a self-cleaning control command is acquired and controlled, and a self-cleaning mode is executed; the rotating speed of a fan of the air conditioner is adjusted and/or the temperature of the indoor heat exchanger is reduced so as to enable the heat exchangerto be frosted; and when frosting is completed, the heating parts are started, and the opening degree of a throttle valve of the air conditioner is adjusted so as to defrost the heat exchanger. According to the technical scheme, the work stability of the air conditioner in the defrosting process is improved, and the self-cleaning effect is greatly improved.

A static CT (computed tomography) scanner comprises an X-ray source system, a detector system, a data acquisition system, a power system and a computer. The X-ray source system comprises an annular X-ray source and a front annular collimator arranged at an exit of the annular X-ray source. The annular X-ray source comprises a plurality of X-ray source modules, a plurality of collimator slits limiting emitting scope of X rays are distributed on the front annular collimator. The detector system comprises two annular detectors with the slits in between which are arranged on the inner side of the front annular collimator. Each annular detector comprises a plurality of detector modules capable of distinguishing energies for X photons. The front annular collimator can completely cover detection area of the detector modules. The detector system further comprises two rear annular collimators arranged on the inner side of the annular detectors and two annular monitoring detectors. The data acquisition system is connected with the detector system and the monitoring detectors. The computer processes data acquired by the data acquisition system and then reconstructs images.

The invention relates to a fertilizer suitable for rice and a preparation method and application of the fertilizer. The fertilizer comprises a leaf surface spraying agent and a soil conditioner, wherein the leaf surface spraying agent comprises 200-230 parts of silicon dioxide, 60-80 parts of potassium nitrate, 8-15 parts of calcium nitrate, 2-3 parts of selenium, 2 or less parts of added elements, 1-2 parts of a plant growth regulator, 0.1 or less part of a bacteriostat and 1,000 parts of water; and the soil conditioner comprises 60-100 parts of potassium-rich rock, 30-50 parts of quick lime,150-300 parts of a sugar alcohol solution, 3-4 parts of urine, 4-5 parts of diammonium phosphate, 0.5-1.5 parts of microelements, 30-50 parts of livestock feces, 20-40 parts of crop straw, 10-30 parts of humic acid, 0.5-1.5 parts of biological bacteria and 0.1 or less part of a bactericide. According to the fertilizer, cadmium is effectively reduced through both the leaf surface spraying agent and the soil conditioner.

The invention provides a large-scale ring polishing machine workpiece carrying transportation vehicle, which mainly comprises a telescopic ascending and descending rod structure controlled by a hydraulic ascending and descending machine, wherein the telescopic ascending and descending rod structure is connected with a support frame, the vertical movement of the support frame can be realized, a rubber rolling wheel device is arranged on the support frame, the horizontal movement of workpieces and workpiece rings can be realized, a hydraulic push rod mechanism is arranged at one end of the support frame, the pushing force moving in the horizontal direction is provided when the workpieces and the workpiece rings are conveyed onto a disc again, and a rubber gasket is arranged on the contact surface of the hydraulic push rod mechanism and the workpieces or the workpiece rings. The large-scale ring polishing machine workpiece carrying transportation vehicle realizes the mechanical operation when the large-scale ring polishing machine workpieces and workpiece rings are carried and transported and are conveyed onto the disc again, the work intensity of workers is reduced, and the work efficiency is improved. The device has the advantages that the structure is simple, the operation is convenient, and the safety in the workpiece carrying transportation process is greatly improved.

The invention discloses an efficient composite fire extinguishing agent and a preparation method thereof, and relates to the technical field of firefighting. The fire extinguishing agent comprises, byweight, 28-36 parts of heptafluoropropane, 40-48 parts of 1,1,2,2,3,3,4-heptafluorocyclopentane, 4-8 parts of liquid nitrogen, 6-12 parts of ammonium bicarbonate, 1-5 parts of calcium carbonate, 1-3parts of potassium sulfate, 2-6 parts of talcum powder and 1-5 parts of diatomite. The fire extinguishing agent has the advantages of combination of the fire extinguishing advantages of several physical and chemical fire extinguishing agents, improved fire extinguishing efficiency, low corrosivity, long atmospheric survival time and low greenhouse effect potential value.

The invention discloses a satellite roof refined thermal design device which comprises a satellite roof, a multilayer structure, a thermal insulation gasket and screws, wherein the multilayer structure comprises a satellite interior multilayer thermal insulation assembly and a satellite exterior multilayer thermal insulation assembly; the satellite interior multilayer thermal insulation assembly is coated on the lower side of the satellite roof and arranged towards the satellite interior side; the satellite exterior multilayer thermal insulation assembly is coated on the upper side of the satellite roof and arranged towards the satellite exterior side; a load is connected onto the satellite roof by virtue of screws; the thermal insulation gasket is positioned between the load and the satellite roof. According to the satellite roof refined thermal design device disclosed by the invention, the influences of space environment and internal external heat flux on the roof can be greatly reduced, the temperature gradient and fluctuation of the roof can be reduced, and different temperature requirements of the roof on a transition section and during an in-orbit period can be met; due to athermal insulation design of the roof and the load, heat leakage of the load can be effectively reduced, and the temperature gradient and fluctuation of the roof can be reduced; the thermal design method is reasonable and feasible, full in material source, high in reliability, simple in process operation, easy to realize and low in cost.

The invention provides a metal particle forming method and a metal particle preparing device. The metal particle forming method comprises the steps that a metal raw material and a heat preservation container are provided, and the bottom of the heat preservation container is provided with holes; the metal raw material is melted, and metal molten liquid is formed; the metal molten liquid is poured into the heat preservation container and dripped out of the holes, and independent metal liquid drops are formed; and the metal liquid drops are solidified, and metal particles are formed. According to the metal particle forming method, the purity of the metal particles can be guaranteed, and the technology efficiency is improved.

The invention relates to a process for preparing metal powder and provides a method for superfine nickel powder by direct reduction. The method comprises the following steps: drying and dehydrating nickel chloride crystals serving as a nickel source to obtain absolute nickel chloride; and performing a reduction reaction by using hydrogen at 230 to 700 DEG C in a protective gas to obtain the superfine nickel powder. In the preparation method, the absolute nickel chloride crystals are reduced directly to form the nickel powder. As the synthesis of a precursor (such as the nickel carbonate or nickel oxalate in the conventional wet-method process) is not required in the solid-phase direct reduction method, working procedures are saved and process cost is reduced greatly; and meanwhile, almostno waste water is discharged, so the method is favorable for environment protection. In addition, the absolute nickel chloride crystals are used as a nickel raw material to undergo a reaction in a hydrogen reducing atmosphere, so the source of carbon is reduced, the carbon content of the final product is reduced, and the low-carbon and environment-protection requirements are met.

The invention discloses a seaweed biological deodorant and a preparation method thereof. The seaweed biological deodorant comprises the following components in parts by weight: 10-20 parts of a composite bacterial agent, 20-40 parts of seaweed pulp, 3-8 parts of inorganic salt, 5-15 parts of molasses, and 40-60 parts of water. The seaweed biological deodorant, provided by the invention, is prepared through the steps of screening and culturing a group of multi-functional microbial flora and fermenting for two times through different fermentation bases, and is the fermented microorganism and metabolite thereof as well as fermentation base material, and can deodorize for purifying air, and can kill pathogenic microorganisms, so that the amount of ammonia gas generated through proteolysis is reduced, and further, environment pollution is reduced.

The invention relates to a manufacturing method of ultra-thin rhenium foil. The manufacturing method comprises the following steps that rhenium powder with the particle size ranging from -100 meshes to -300 meshes and the purity being 4 N or above is placed in a press machine, and a pure rhenium pressed blank with the thickness being 10 mm is prepared under the pressure ranging from 100 Mpa to 200 Mpa; the pure rhenium pressed blank is placed in a vacuum furnace or a high-temperature furnace to be subjected to high-temperature sintering, and a pure rhenium plate blank uniform in crystallization is prepared; the pure rhenium plate blank is continuously rolled by adopting a multi-roll mill and annealing linkage, and continuous rolling and annealing are carried out until a rhenium sheet is obtained; and the rhenium sheet is subjected to a combined rolling process in which chemical etching thinning and multi-roll mill finish rolling are carried out in parallel, and finally the ultra-thin rhenium foil with the target product thickness being 9-11 microns is obtained. The method has the advantages of high efficiency, good surface quality, low equipment investment and the like.

The invention discloses a debris flow prevention and treatment device and method. A debris flow ditch is included, the outer surface of the upper end of the debris flow ditch is provided with first intercepting dams and second intercepting dams, the first intercepting dams are located on one sides of the second intercepting dams, a water flowing groove is formed between the two first interceptingdams in a longitudinal connection manner, and a first baffle is arranged between the two first intercepting dams in a transverse connection manner. The method comprises the following steps that firstly, related situations of the debris flow ditch are investigated and analyzed; secondly, the field area of the debris flow ditch is subjected to the statistics, and the development tendency of the debris flow ditch is predicted; thirdly, the intercepting and dredging project is set; and fourthly, the scour prevention forest is arranged. Mainly for the debris flow prevention and treatment device andmethod, components in the debris flow can be effectively subjected to flow dividing, the flow swashing speed of the debris flow can be reduced, large-solid landslide can be effectively hindered, thedownward flow activity of gravels and liquid is not hindered, the situation that the solid is left and liquid flows away is achieved, in addition, the strength of soil is improved, and the loose solidobject source is reduced.