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公开(公告)号：US11753308B1
公开(公告)日：2023-09-12
申请号：US18139844
申请日：2023-04-26
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY
Inventor： Yufeng Wu , Minwei Song , Qijun Zhang
CPC classification number: C01F17/241 , C09G1/02 , C09K3/1418 , C22B1/005 , C22B7/007 , C22B59/00
Abstract: The invention relates to a method of separating and extracting rare-earths from rare-earth polishing powder waste and regenerating rare-earth polishing powder, which is characterized by: firstly, process the waste powder with first acid leaching, alkali roasting, and second acid leaching to separate and extract rare-earths from rare-earth polishing powder waste to obtain the leaching solution of rare-earth chloride; secondly, precipitate from the leaching solution with ammonia to remove impurities and hydrochloric acid solution to obtain the purified solution of rare-earth chloride; thirdly, co-precipitate from the solution acquired in the second step with hydrofluoric acid, ammonium bicarbonate, and dispersant to obtain the lanthanum cerium fluoro-carbonate; and finally, after drying, two-stage high-temperature calcination, and ball milling, the regenerated rare-earth polishing powder with decent polishing performance can be obtained. The total leaching efficiency of rare-earths in the rare-earth polishing powder waste of the present invention reaches more than 95%, and the total recovery efficiency of rare-earths reaches more than 93%, which realizes the efficient separation, extraction, and regeneration of rare-earths in the rare-earth polishing powder waste.
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公开(公告)号：US11746042B2
公开(公告)日：2023-09-05
申请号：US17993844
申请日：2022-11-23
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY
Inventor： Yufeng Wu , Xiaomin Liu , Bin Li
CPC classification number: C03C10/0063 , C22C1/02 , C22C38/02
Abstract: The invention discloses a method for synergistically preparing ferrosilicon alloy and glass-ceramics from photovoltaic waste slag and non-ferrous metal smelting iron slag, and belongs to the technical field of collaborative resource utilization of various smelting slag areas. According to the method, the zinc rotary kiln slag and a reduction tempering agent are subjected to batching, mixing and high-temperature melting to form a reduction-state iron-containing material. The iron-containing material and the silicon slag are further subjected to mixed melting, water quenching and sorting to obtain the ferrosilicon alloy and residual waste slag. The residual waste slag is subjected to tempering, melting, molding, annealing and heat treatment to obtain the glass ceramics. According to the method, the ferrosilicon alloy and the glass ceramics are prepared from the silicon slag and the zinc rotary kiln slag, and a collaborative resource utilization target of the regional smelting slag is achieved. The ferrosilicon alloy is obtained through high-temperature reduction of the zinc rotary kiln slag and chemical combination of the zinc rotary kiln slag and the silicon-rich silicon slag. Because the high-temperature decomposition of silica is not involved, the process greatly reduces the energy consumption, saves the cost and is suitable for industrial popularization and application.
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33.发明公开公开(公告)号：US20230259075A1
公开(公告)日：2023-08-17
申请号：US18136812
申请日：2023-04-19
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY
Inventor： Honggui HAN , Lu ZHANG , Junfei QIAO
CPC classification number: G05B13/0265 , C02F3/302 , G05B13/041
Abstract: A dynamic multi-objective particle swarm optimization based optimal control method is provided to realize the control of dissolved oxygen (SO) and the nitrate nitrogen (SNO) in wastewater treatment process. In this method, dynamic multi-objective particle swarm optimization was used to optimize the operation objectives of WWTP, and the optimal solutions of SO and SNO can be calculated. Then PID controller was introduced to trace the dynamic optimal solutions of SO and SNO. The results demonstrated that the proposed optimal control strategy can address the dynamic optimal control problem, and guarantee the efficient and stable operation. In addition, this proposed optimal control method in this present invention can guarantee the effluent qualities and reduce the energy consumption.
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公开(公告)号：US11699633B1
公开(公告)日：2023-07-11
申请号：US18148986
申请日：2022-12-30
Applicant: Beijing University of Technology
Inventor： Tong An , Rui Zhou , Yakun Zhang , Fei Qin
IPC: H01L23/40 , H01L23/473 , F16F15/04
CPC classification number: H01L23/4006 , H01L23/473 , F16F15/04 , H01L2023/4025 , H01L2023/4081 , H01L2023/4087
Abstract: Disclosed is a pressure balancing clamp for a press-pack insulated gate bipolar transistor (IGBT) module. The pressure balancing clamp for a press-pack IGBT module includes a bracket, where the bracket is provided with two longitudinally arranged pressure equalizing plates in a sliding way; the pressure equalizing plates are connected through pressure sensors; the upper and lower ends inside the bracket are respectively connected with the pressure equalizing plates through hydraulic devices and a displacement compensation device; opposite surfaces of the two pressure equalizing plates are respectively provided with heat dissipation and confluence devices. The pressure sensors are in one-to-one correspondence with the hydraulic devices and are electrically connected. The hydraulic devices adjust the pressure according to the readings of the pressure sensors in corresponding directions, so that the pressure of the press-pack IGBT module is balanced.
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公开(公告)号：US20230114714A1
公开(公告)日：2023-04-13
申请号：US17041354
申请日：2020-04-02
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY
Inventor： Yongzhen Peng , Yan Feng , Bo Liu , Lei Wu
Abstract: A method for advanced nitrogen and phosphorus removal of domestic sewage based on DEAMOX in AOAO process with sludge double-reflux is disclosed. The method comprises allowing domestic sewage and returned sludge of the secondary sedimentation tank (3) to enter the anaerobic zone (2.1) of the AOAO reactor (2), firstly performing partial denitrification by the denitrifying bacteria, reducing nitrate-nitrogen in the returned sludge to nitrite-nitrogen, then converting ammonia-nitrogen and nitrite-nitrogen into nitrogen by anammox bacteria, and phosphate accumulating bacteria and denitrifying phosphate accumulating organisms performing anaerobic phosphate release and storing internal carbon source; then allowing part of the mixed liquid to enter the intermediate aerobic zone (2.2) of the AOAO bioreactor (2) to carry out phosphate uptake and nitrification reaction, allowing another part of the mixed liquid to enter the anoxic zone (2.3) of the AOAO bioreactor (2), at same time allowing all the mixed liquid of the intermediate aerobic zone (2.2) and part of returned sludge of the secondary sedimentation tank (3) to enter the anoxic zone (2.3), using the internal carbon source stored in the anaerobic compartment and the internal carbon source in the returned sludge to carry out partial denitrification, anammox, denitrifying dephosphatation, and then allowing the mixed liquid to enter the post aerobic zone (2.4) and subsequently enter the secondary sedimentation tank (3) for mud-water separation. An apparatus for advanced nitrogen and phosphorus removal of domestic sewage based on DEAMOX in AOAO process with sludge double-reflux is also disclosed.
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Patent Agency Ranking
36.发明申请公开(公告)号：US20230039597A1
公开(公告)日：2023-02-09
申请号：US17880794
申请日：2022-08-04
Applicant: Beijing University of Technology
Inventor： Lihua WANG , Dongwei LI , Yan MA , Xiaodong HAN , Qingsong DENG
IPC: B23K20/00
Abstract: A method utilizing cold welding to prepare grain boundaries having different included angles includes using a device including a support member. Two bent members are arranged opposite to each other in the support member. One ends of the two bent members are both fixedly connected to the support member, one end, away from the support member, of any bent member is fixedly connected to a first sample, one end, away from the support member, of the other bent member is fixedly connected to a second sample, and the first sample and the second sample are arranged corresponding to each other. The bent member includes a first metal sheet and a second metal sheet having different thermal expansion coefficients. An angle between the first sample and the second sample during butt welding can be controlled by changing an included angle of a bimetallic sheet.
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公开(公告)号：US20220404232A1
公开(公告)日：2022-12-22
申请号：US17741474
申请日：2022-05-11
Applicant: Beijing University of Technology
Inventor： Jinbao JI , Sen YANG , Zongxiang HU , Weiqi ZHANG
IPC: G01M7/02
Abstract: A frequency domain feedforward compensation method based on a power exponential method for a seismic simulation shaking table is provided. According to the method, a frequency domain amplitude transfer function of a system is identified, the frequency domain amplitude transfer function is modified by adjusting the power and limiting an amplitude, then an inverse frequency domain amplitude transfer function is obtained, an amplitude and a phase of a driving acceleration signal are computed, finally a time domain driving acceleration signal is obtained by using the Euler's formula for computation in a complex domain and conducting inverse Fourier transform, the shaking table is driven again to collect an acceleration signal output by a table top, whether the acceleration signal meets a shaking table test waveform use requirement is determined, a test is finished under the condition that the acceleration signal meets the shaking table test waveform use requirement.
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公开(公告)号：US20220315430A1
公开(公告)日：2022-10-06
申请号：US17843934
申请日：2022-06-17
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY , Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences
Inventor： Yufeng WU , Haoran Yuan
IPC: C01B32/984 , C22B7/00
Abstract: The invention discloses a method for producing silicon carbide from waste circuit board cracking residue, belongs to the field of comprehensive utilization of waste circuit board cracking products, and particularly relates to a method for high-valued utilization of non-metal components in waste circuit board cracking residue. The method mainly comprises the following steps: rolling and crushing, vibration sorting, ultrafine pulverization and electro-separation, quantitative batching, microwave sintering and discharging and grading. Compared with the prior art, rolling crushing is adopted to replace traditional shearing crushing, microwave sintering is adopted to replace a traditional Acheson smelting furnace, the effects of being easy to operate, saving energy and reducing consumption are achieved, the production efficiency is greatly improved, and the production cost is reduced. A brand-new method for obtaining high-purity silicon carbide by partially replacing anthracite and quartz sand with cracked coke and silicon dioxide in waste circuit board light plates or epoxy resin cracking residues is adopted, and high-value utilization of waste resources is achieved. The method has the characteristics of simple and feasible process, low manufacturing cost and wide adaptability, and is beneficial to improving the economic benefit and social benefit of enterprise production.
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39.发明授权公开(公告)号：US11366082B2
公开(公告)日：2022-06-21
申请号：US17516520
申请日：2021-11-01
Applicant: BEIJING UNIVERSITY OF TECHNOLOGY
Inventor： Jingpin Jiao , Li Li , Xiang Gao , Quan Cheng , Cunfu He , Bin Wu
Abstract: The invention discloses a non-linear Lamb wave mixing method for measuring stress distribution in thin metal plates. The method is suitable for stress distribution detection and stress concentration area positioning in a plate structure and belongs to the field of nondestructive detection. The steps of the present invention is: first determines the excitation frequencies of two fundamental waves according to the measured object and the nonlinear Lamb wave mixing resonance conditions; the left and right ends of the test piece are oppositely excited two rows of A0 mode waves, and the excitation signal receive the sum-frequency S0 signal at a certain position to detect non-linear mixing stress of the plate structure; by changing the excitation time delay of the excitation signal, perform mixing scan on different positions of the test piece to extract the mixing wave amplitude; finally, according to the variation of amplitude of sum frequency difference signal with mixing position to realize the detection of stress distribution of metal plate and the positioning of the stress concentration area.
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公开(公告)号：US11364570B2
公开(公告)日：2022-06-21
申请号：US16740780
申请日：2020-01-13
Applicant: Beijing University Of Technology
Inventor： Wuxiong Yang , Jianglin Zou , Jiejie Xu , Shikai Wu
IPC: B23K26/342 , B33Y10/00 , B33Y70/00 , B23K26/082 , B23K26/14 , B23K35/00
Abstract: A micro-region semi-solid additive manufacturing method is provided, where rod-shaped materials are used as consumables, and front ends of the consumables are heated by means of high-energy beam, an electric arc, a resistance heat, or the like, to enable the front ends to be in a semi-solid state in which the solid-liquid two phases coexist; at the same time, the rotational torsion and the axial thrust are applied to the consumables to perform shearing, agitation and extrusion on the semi-solid front ends, that is, the mold-free semi-solid rheoforming is performed. The consumable is transmitted to the bottom layer metal continuously in this manner to form metallurgical bonding, the stacking process is repeated according to a planned route obtained after discretization slicing treatment, and then an object or a stack layer in a special shape can be formed.
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