8results about How to "Reduce oxidation reaction" patented technology

This invention discloses a method for preparing high-purity oxygen-free copper, relating to the field of metallurgical technology. The method includes multi-stage electrolytic refining, gradient-heating vacuum melting, inert gas-protected refining, electron beam melting, hydrogen plasma arc melting, directional solidification, and post-treatment steps. The multi-stage electrolytic refining utilizes a specific component electrolyte and periodically commutated current; vacuum melting is combined with bidirectional electromagnetic stirring; inert gas-protected refining is combined with a gradient reduction composite covering agent; electron beam and hydrogen plasma arc melting achieve deep purification and deoxidation; and directional solidification and two-stage annealing ensure product performance. The high-purity oxygen-free copper prepared by this invention has a conductivity of 102.3% IACS, a copper content ≥99.9999%, and an oxygen content <1.0 ppm. It exhibits high purity, low oxygen content, and excellent conductivity. The process is stable and controllable, making it suitable for high-end electronics applications.

This invention discloses a method for increasing shale gas production from multi-stage fracturing shale formations. First, water containing water-absorbing resin is intermittently injected into the shale gas well, impacting the shale layer and creating multiple fractures, forming a primary fracturing process. Next, liquid nitrogen and sodium particles are injected into the shale gas well. The resin, already saturated with water, remains within the fractures. At this point, the liquid nitrogen cools the shale layer below its freezing point, causing the saturated resin to freeze and rapidly expand, forming a secondary fracturing process. Then, as the injected liquid nitrogen continues to vaporize, it further freezes the water and water-absorbing resin adsorbed by the shale, forming a tertiary fracturing process. When the temperature of the shale layer exceeds its freezing point, the expanded ice on the water-absorbing resin melts into water. At this point, the sodium particles react with the water, releasing a large amount of heat, causing the shale layer temperature to rise rapidly, creating a thermal shock to the low-temperature shale layer, forming a quaternary fracturing process. This completes the multi-stage fracturing process of the shale layer, effectively improving the extraction efficiency of shale gas.

The utility model provides a kind of double-chamber double-pressurization quantitative furnace, including lifting furnace frame, lifting furnace frame top surface is connected with furnace body, furnace body includes main furnace chamber and quantitative chamber, and main furnace chamber and quantitative chamber are communicated by liquid inlet valve between;Quantitative chamber top opening is connected with quantitative chamber cover, quantitative chamber cover is connected with vacuum pump and delivery pipe, the delivery pipe is equipped with liquid outlet control valve, and liquid outlet control valve controls delivery pipe opening or closing;Quantitative chamber is pumped by vacuum pump or pressurization, and delivery pipe sends out aluminium liquid from quantitative chamber.When quantitative chamber is pumped by vacuum pump, aluminium liquid flows from main furnace chamber to quantitative chamber by liquid inlet valve;When quantitative chamber is pressurized by vacuum pump, aluminium liquid in quantitative chamber is sent out from delivery pipe.The utility model sets up main furnace chamber and quantitative chamber, realizes fast and accurate soup by controlling vacuum pump forward and reverse, satisfies high frequency, mass production demand, sets up chute as tubular, reduces aluminium liquid and air contact, reduces oxidation reaction, improves product quality.

This invention relates to the field of comprehensive utilization technology of iron and steel smelting resources, specifically to a method for the direct recycling and utilization of iron-rich red mud in converter steelmaking. The method includes the following steps: Step 1: Retaining slag, including MgO, in the converter for slag splashing and furnace protection; Step 2: Adding fine-grained limestone to the converter; Step 3: Adding iron-rich red mud to the converter, and shaking the converter 2-3 times after the mud has been added; Step 4: Verticalizing the converter and blowing nitrogen into it at least once using a top-blowing method, with each blowing lasting 3-5 seconds and an interval of 10 seconds between each blowing; Step 5: Adding scrap steel to the converter, waiting 0-5 minutes, then adding molten iron and starting the blowing process. This invention directly applies iron-rich red mud to the converter steelmaking process, achieving dephosphorization of molten iron with high phosphorus content without the use of flux.

The invention provides a whitening type composite modifier as well as a preparation method and application thereof, and belongs to the technical field of inorganic material modification. The whitening type composite modifier provided by the invention is prepared from the following preparation raw materials in parts by mass: 55 to 65 parts of titanium dioxide, 2 to 5 parts of a fluorescent whitening agent, 15 to 25 parts of an aluminate coupling agent, 5 to 10 parts of a titanate coupling agent, 10 to 20 parts of stearic acid, 2 to 5 parts of a dispersing agent and 1 to 2 parts of an antioxidant. The whitening type composite modifier can be applied to modification of various inorganic powder, the whiteness of the inorganic powder treated by the whitening type composite modifier is obviously improved, and the dispersity and the stability are obviously improved.

The utility model discloses a kind of crude tin smelting heat preservation devices, it includes: cover body, to cover container to cooperate container to form heat preservation space, the inner side edge of the cover body is equipped with the sealing strip of sealing container mouth, the top side of the cover body is equipped with sliding hole;Reference ruler rod, the reference ruler rod is vertically fixed in the top side of the cover body and is arranged close to the sliding hole;Floating ball liquid level indicating component, the floating ball liquid level indicating component sliding connection the sliding hole, the floating ball liquid level indicating component is based on the up-and-down floating of container interior liquid, the floating ball liquid level indicating component cooperates the reference ruler rod and indicates container interior liquid level information, the utility model structure is simple, use is safe and convenient, can monitor the liquid level state of container interior metal liquid in real time, reduce uncovering heat loss.

The utility model relates to rare earth hydrogen storage alloy or quick -setting neodymium iron boron alloy smelting auxiliary equipment technical field, specific, relate to a kind of rare earth metal powder explosion -proof dust collecting device, including shell, filter bag chamber, backflush mechanism, dust-containing gas inlet, purified gas outlet, still include inert gas supply gas path, explosion suppressor, explosion vent. Nitrogen gas path is introduced on the one hand reduces the oxygen content in dust collecting device, makes oxygen concentration reduce, reduces the oxidation reaction of rare earth metal, reduces the generation of heat. On the other hand, nitrogen in nitrogen gas path low pressure gas path is obtained by high-pressure liquid nitrogen throttling pressure reduction, temperature is lower, it is favorable to reduce the temperature in dust collecting device. The introduction of nitrogen gas path greatly reduces the explosion risk, this is the conventional working process. By introducing explosion suppressor, explosion vent, cooling can be carried out when temperature is too high and pressure relief after explosion, to slow down the progress of explosion and protect the entire device after explosion.

The utility model relates to the technical field of workpiece spraying, and discloses a surface cooling device for a thermal spraying workpiece, which comprises a thermal spraying gun body, the top end of the thermal spraying gun body is fixedly connected with mounting blocks, one side of each mounting block is fixedly connected with a two-side inserting assembly, the interiors of the two mounting blocks are connected with supporting rods in an inserting manner, and the supporting rods are fixedly connected with the two-side inserting assembly. The top end of the supporting rod is fixedly connected with a cooling assembly. According to the surface cooling device for the thermal spraying workpiece, through the arrangement of the cooling assembly, when the surface cooling device is used, a semiconductor chilling plate is started, the semiconductor chilling plate cools gas in a circulation pipe, a draught fan is started, air blown out by the draught fan passes through the interior of the circulation pipe and becomes cold air, and the cold air is blown out from one end of the circulation pipe to cool the sprayed workpiece; the surface temperature of a workpiece can be rapidly reduced, so that continuous spraying is achieved, the production efficiency is improved, meanwhile, oxidation reaction can be reduced, and the quality of a coating is improved.