6results about How to "Downgrade" patented technology

The present application relates to a reinforced concrete pillar and a method for blasting demolition of a structure, which forms a door hole by breaking a supporting cylinder wall of a high-rise structure, replaces the supporting system of the door hole with an axial pre-buried hole reinforced concrete pillar, and simultaneously charges and blasts in the pre-buried hole while drilling and charging in the remaining supporting cylinder wall, thereby achieving the blasting demolition of the high-rise structure. The present application can greatly improve the safety of blasting demolition, ensure the accuracy of directional collapse, greatly reduce the consumption of explosives and detonators, simplify the blasting network and charging operation, greatly reduce the blasting vibration and blasting dust, and achieve a more green blasting demolition. The present application is suitable for the blasting demolition of high-rise structures such as chimneys, water towers and silos made of bricks, concrete and reinforced concrete, and has a wide range of applications.

The utility model relates to the field of scroll compressor, concretely is a kind of built-in two-stage oil separation component, for scroll compressor, the scroll compressor includes first exhaust port, including exhaust chamber, primary separation unit and secondary separation unit, the primary separation unit inside is barrel, and the secondary separation unit inside is barrel with smaller open end;The open end inner diameter of primary separation unit is less than the inner diameter of secondary separation unit bottom end, and the open end of primary separation unit and the open end of secondary separation unit are communicated.The utility model forms the flow rate of gas greater than the flow rate of tiny oil droplet by primary separation unit, forms the flow rate of gas less than the flow rate of tiny oil droplet by secondary separation unit, and oil-gas mixed gas is separated continuously two times, greatly improves oil-gas separation efficiency.

The application discloses high-sulfur steel, including components and mass percentage: C: 0.67%-0.73%, Si: 0.15%-0.25%, Mn: 0.45%-0.65%, P: ≤0.045%, S: 0.060%-0.070%, Cr: 0.10%-0.20%, Mo: ≤0.06%, Ni: ≤0.20%, V: 0.03%-0.04%, Al: ≤0.03%, N: 0.012%-0.016%, the balance is Fe and impurities.The application provides a preparation process of high-sulfur steel, including the following steps: step S1, converter process; step S2, refining process; step S3, VD process; step S4, continuous casting process.The beneficial effect is that the Al content in the steel is controlled at a relatively high level to offset the secondary oxidation caused by the addition of quartz sand at the end of the refining, that is, the low oxygen state in the steel is ensured by Al.

The present application relates to a kind of tailings classification scanning device, belong to mineral separation technical field.The device includes: tailings separation unit, with the separation cylinder upper end of mineral separation equipment is connected or with separation cylinder, including tailings overflow weir, configured to discharge tailings in the separation cylinder from the tailings overflow weir;Tailings classification unit is arranged in the periphery of the tailings separation unit, including tailings classification overflow weir, configured to discharge the tailings classified processing, to obtain tailings of different levels;The height value of the tailings classification overflow weir is less than the height value of the tailings overflow weir.The present application can realize the multistage separation of tailings, to obtain different grade and the stable component content of tailings, to reduce the waste of mineral resources, improve the component content qualified rate of each grade product.

This invention belongs to the field of iron and steel metallurgical refining technology, specifically relating to a method for treating inclusions in heavy rail steel using tellurium or calcium tellurium composite treatment. To reduce the Class A inclusion rating of heavy rail steel, this invention provides a method for treating inclusions in heavy rail steel using tellurium or calcium tellurium composite treatment. This method involves performing tellurium or calcium tellurium composite treatment during RH refining to improve the morphology of sulfides in the heavy rail steel. The tellurium or calcium tellurium composite treatment process employs inert gas soft blowing to enhance the circulation of molten steel in the ladle, thereby improving the effect of the tellurium or calcium tellurium composite treatment, reducing the Class A inclusion rating, and improving the machinability of the steel.

This invention relates to a chlorine-free green refining method for crude bismuth, belonging to the field of pyrometallurgical technology for non-ferrous metals. The process includes: oxygen-enriched ash blowing: removing arsenic and antimony from crude bismuth to a content of ≤0.08%; vacuum distillation: vacuum distilling the arsenic-antimony-removed crude bismuth to obtain volatile lead-bismuth-tellurium alloy and residual copper-tin-silver alloy; alkali removal of tellurium: adding caustic soda to the lead-bismuth-tellurium alloy under oxygen-enriched blast to obtain a lead-bismuth alloy and alkaline slag; preliminary lead removal through oxidation slag formation: blowing the lead-bismuth alloy into oxygen-enriched air while simultaneously adding slag-forming agents in batches to obtain bismuth-rich lead; continuous crystallization: continuously crystallizing the bismuth-rich lead to obtain refined bismuth with a purity greater than 99.99 wt% and a bismuth-based lead alloy. This invention employs a technical solution of "oxygen-enriched ash blowing – vacuum distillation – alkali removal of tellurium – preliminary lead removal through oxidation slag formation – continuous crystallization," forming a novel short-process, environmentally friendly refining technology to purify crude bismuth into refined bismuth.