公开(公告)号：US20240191317A1

公开(公告)日：2024-06-13

申请号：US18463301

申请日：2023-09-08

Applicant: University of Science and Technology Beijing ,  Liaoning Academy of Materials

Inventor： Guangsheng WEI ,  Rong ZHU ,  Xinping MAO ,  Shuize WANG ,  Chengjin HAN ,  Kai DONG ,  Chao FENG ,  Xin LI

IPC: C21C7/072 ,  C21C7/10

CPC classification number: C21C7/072 ,  C21C7/10

Abstract: A method for efficiently removing Cu in electric furnace steelmaking with regenerated steel raw materials comprises removing Cu in the electric furnace steelmaking and removing Cu deeply in RH/VOD steelmaking. The removing Cu in electric furnace steelmaking comprises removing Cu by spraying CaO—CaCl2—O2 in stages in the electric furnace steelmaking; the removing Cu deeply in the R/VOD steelmaking comprises removing Cu deeply by dynamically blowing CaCl2—O2 based on vacuum degree. Cu removing and Cu removing deeply are performed in the electric furnace steelmaking and the RH/VOD refining process based on the Cu removal principle of selective chlorination by high-oxygen-potential microcells manufactured in electric furnace steelmaking molten pool and on the RH/VOD refined steel liquid level and the high-vacuum smelting environment in the RH/VOD refining process fully utilized; the cost is low, the copper removing efficiency is high, and large-scale industrial production are facilitated.

公开(公告)号：US20240158876A1

公开(公告)日：2024-05-16

申请号：US18459388

申请日：2023-08-31

Applicant: University of Science and Technology Beijing

Inventor： Guangsheng WEI ,  Hongjing ZHANG ,  Rong ZHU ,  Afan XU ,  Yu CHEN ,  Ruimin ZHAO ,  Kai DONG ,  Bohan TIAN ,  Botao XUE ,  Chao FENG

IPC: C21C5/52

CPC classification number: C21C5/52 ,  C21C2005/5288

Abstract: A method for evaluating energy efficiency of electric arc furnace steelmaking comprises: obtaining original smelting information of the electric arc furnace; processing the original smelting information, and calculating an electrical energy efficiency evaluation index and a chemical energy efficiency evaluation index for process operation; wherein the electrical energy efficiency evaluation index comprises circuit efficiency, transformer tap capacity utilization rate and electrical energy thermal efficiency, and the chemical energy efficiency evaluation index comprises oxygen utilization rate, carbon powder utilization rate and chemical energy thermal efficiency; and evaluating an energy utilization condition of the electric arc furnace comprehensively based on the electrical energy efficiency evaluation index and the chemical energy efficiency evaluation index. According to the method, a basis can be provided for subsequent smelting process adjustment, and the energy utilization efficiency of the electric arc furnace is improved.

公开(公告)号：US11859269B1

公开(公告)日：2024-01-02

申请号：US18125173

申请日：2023-03-23

Applicant: University of Science and Technology Beijing

Inventor： You Wang ,  Zhangjian Zhou

IPC: C22C33/06 ,  C22C33/00 ,  C22C38/22 ,  C22C38/24 ,  C22C38/34 ,  C22C38/00

CPC classification number: C22C33/06 ,  C22C33/006 ,  C22C38/002 ,  C22C38/22 ,  C22C38/24 ,  C22C38/34

Abstract: Disclosed are a high strength-ductility matched oxide-particles dispersion steel, a preparation method and application thereof, belonging to the technical field of novel structural materials. The high strength-ductility matched oxide-particles dispersion steel comprises the following components in percentage by mass: chromium (Cr) 11.0-13.0 percent (%), tungsten (W) 1.0-2.0%, vanadium (V) 0.1-0.2%, yttrium (Y) 0.3-0.4%, oxygen (O) 0.05-0.15%, silicon (Si) 1.5-2.5%, carbon (C) ≤0.0016%, with iron (Fe) and unavoidable impurities accounting for a rest. The high strength-ductility matched oxide-particles dispersion steel in the present application is prepared, using a powder metallurgical preparation method, by introducing high-content of silicon elements and introducing high-density oxide particles with a complete core-shell structure using a specific heat treatment regime.

公开(公告)号：US20230417526A1

公开(公告)日：2023-12-28

申请号：US18342369

申请日：2023-06-27

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Renshu YANG ,  Chenxi DING ,  Min GONG ,  Desheng WANG ,  Songlin HE ,  Chenglong XIAO ,  Shuai YOU ,  Wen CHEN

IPC: F42D1/08 ,  F42D3/04

CPC classification number: F42D1/08 ,  F42D3/04

Abstract: An efficient cut blasting method for medium-length holes in deep high-stress rock roadway is disclosed. The method may comprise steps of carrying out a crustal stress blasting test on the free face of the in-situ rock roadway to be excavated, and obtaining a distribution state of cracks under a synergistic action of crustal stress, explosion stress waves and clamping force of surrounding rock of a rock mass in the stratum where the in-situ rock roadway to be excavated is located; arranging a cutting hole net on the free face of the rock roadway to be excavated according to a distribution state of the cracks; performing cut blasting based on the cutting hole net.

公开(公告)号：US11773683B1

公开(公告)日：2023-10-03

申请号：US18124587

申请日：2023-03-22

Applicant: NORIN MINING LIMITED ,  University of Science and Technology Beijing

Inventor： Chao Liu ,  Yunpu Qi ,  Zhanglun Song ,  Shuai Zhang ,  Liang Wang ,  Shenghua Yin ,  Fusong Dong ,  Dapeng Chen ,  Leiming Wang

IPC: E21B33/13

CPC classification number: E21B33/13

Abstract: A segmented grouting method for ramp drivage in an aquifer is provided. Concerning grouting reinforcement for a ramp in an aquifer, a grouting process is divided into four stages according to a pressure change, that is, micro-pressure filling, low-pressure diffusion, medium-pressure reinforcement, and high-pressure fracturing. In the micro-pressure filling, an initial pressure of a grouting orifice is 0, and a low-concentration single-component grout is used to fill an original fissure of the aquifer. In the low-pressure diffusion, a low-concentration bicomponent grout is used for grouting, the original fissure is expanded, and a grouting radius is increased. In the medium-pressure reinforcement, a high-concentration bicomponent grout is used for grouting, thereby reinforcing the aquifer. In the high-pressure fracturing, a high-concentration bicomponent grout is used to reinforce a new fractured fissure of the orifice caused by a high pressure and the original fissure, thereby forming a confining bed.

公开(公告)号：US11767605B1

公开(公告)日：2023-09-26

申请号：US18331675

申请日：2023-06-08

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Zhe Wang ,  Shuqiang Jiao ,  Zheng Huang ,  Xinrui Wang

IPC: C25C7/06 ,  C25C3/36 ,  C21D1/84 ,  C21D1/74 ,  C21D9/46 ,  C21D6/00 ,  C22C38/14 ,  C22C38/12 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C25C7/02

CPC classification number: C25C7/06 ,  C21D1/74 ,  C21D1/84 ,  C21D6/005 ,  C21D6/008 ,  C21D9/46 ,  C22C38/001 ,  C22C38/002 ,  C22C38/004 ,  C22C38/008 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14 ,  C25C3/36 ,  C25C7/02 ,  C22C2202/02

Abstract: A preparation method of gradient high-silicon steel by molten salt electrolysis includes: weighing the inorganic fluoride salt and the inorganic silicon salt, mixing them uniformly and then drying; heating the electrolysis container over the melting point of the electrolyte, passing the inert gas through the electrolysis container, and connecting the electrode to the power supply to perform constant current electrolysis, after the electrolysis is finished, the cathode is taken out, washed and dried, placing the dried cathode in a constant temperature region of an annealing furnace; under a protective gas atmosphere, heating the cathode to the target temperature, and maintaining the temperature for a period of time; after the heat treatment, cooling the cathode to the room temperature, during which the cathode is always placed in the furnace.

公开(公告)号：US11697154B2

公开(公告)日：2023-07-11

申请号：US16926868

申请日：2020-07-13

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Baicheng Zhang

IPC: B22F3/24 ,  C25F3/16 ,  C25F7/00 ,  B33Y40/20

CPC classification number: B22F3/24 ,  B33Y40/20 ,  C25F3/16 ,  C25F7/00 ,  B22F2003/241

Abstract: A polishing method for an inner wall of a hollow metal part, including: firstly, placing a coaxial cathode in an inner hole of a metal part when a metal part model is designed, and printing the metal part model and the coaxial cathode together; then, sealing two ends of an inner hole cavity of the metal part by using a light curing part, fixing the coaxial cathode, filling the cavity with a polishing solution, and performing polishing treatment by using an electrochemical polishing method; and finally, reversing an electrode to break the coaxial cathode and take out the broken coaxial cathode to obtain a polished metal part. The polishing of a complex-shaped inner hole of a 3D-printed metal part is realized, the defect that an inner hole of a 3D-printed metal part with a complex-shaped hollow part cannot be polished by using a traditional machining method is overcome, the problem that an inner wall of a metal part polished by using an electrochemical method is non-uniform is solved, the surface quality of the inner hole of the 3D-printed metal part with the complex-shaped hollow part is improved, and the application prospect and postprocessing technology of the 3D-printed metal part are expanded.

公开(公告)号：US11674192B2

公开(公告)日：2023-06-13

申请号：US17953832

申请日：2022-09-27

Applicant: University of Science and Technology Beijing

Inventor： Yanling Zhang ,  Zheng Zhao ,  Weifeng Zhang ,  Zhonghua Zhan

IPC: C21C7/064 ,  C21C7/068 ,  C21C1/02

CPC classification number: C21C7/0645 ,  C21C1/025 ,  C21C7/068

Abstract: A method of making steel by deeply dephosphorization in a hot metal tank and decarburization using semi-steel with nearly zero phosphorus load in a converter includes the following steps: putting an efficient dephosphorization agent into the hot metal tank in advance, and conducting dephosphorization during blast furnace tapping and transportation of blast furnace hot metal by the hot metal tank to obtain semi-steel with [P] less than 0.04 wt. % and [C] greater than or equal to 3.5 wt. %; and removing dephosphorization slag, and pouring the semi-steel into the converter for decarburization to obtain molten steel. The efficient dephosphorization agent includes iron oxide scale, lime, and composite calcium ferrite. According to the method, a phosphorus content of the blast furnace hot metal is reduced to be less than or equal to 0.04 wt. % through the efficient dephosphorization agent.

公开(公告)号：US11673196B2

公开(公告)日：2023-06-13

申请号：US16793897

申请日：2020-02-18

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Lin Zhang ,  Xuanhui Qu ,  Xingyu Li ,  Mingli Qin ,  Yanhao Dong ,  Ju Li ,  Guanghua Wang ,  Ying Long ,  Wei Zhong

IPC: B22F3/16 ,  B22F9/02 ,  B22F1/05 ,  B22F1/10 ,  B22F1/065 ,  B22F1/142 ,  B22F9/04

CPC classification number: B22F3/16 ,  B22F1/05 ,  B22F1/065 ,  B22F1/10 ,  B22F1/142 ,  B22F9/026 ,  B22F2009/041 ,  B22F2201/013 ,  B22F2201/11 ,  B22F2203/11 ,  B22F2203/13 ,  B22F2301/20 ,  B22F2998/10

Abstract: A method to achieve full densification and grain size control for sintering metal materials, wherein raw material powder is deagglomerated to obtain deagglomerated powder with dispersion. The deagglomerated powder is granulated by spray granulation. The granulated particles are processed by high-pressure die pressing and cold isostatic pressing. The powder compact is sintered by two-step pressureless sintering. The first step is to heat up the powder compact to a higher temperature and hold for a short time to obtain 75-85% theoretical density; the second step is to cool down powder compact to a lower temperature and hold for a long time. The two-step sintering can decrease the sintering temperature, so that the powder compact can be densified at a lower temperature. Thus, the obtained refractory metal product is densified, with ultrafine grains, uniform grain size distribution, and outstanding mechanical properties.

公开(公告)号：US20230121123A1

公开(公告)日：2023-04-20

申请号：US17953832

申请日：2022-09-27

Applicant: University of Science and Technology Beijing

Inventor： Yanling ZHANG ,  Zheng ZHAO ,  Weifeng ZHANG ,  Zhonghua ZHAN

IPC: C21C7/064 ,  C21C1/02 ,  C21C7/068

Abstract: A method of making steel by deeply dephosphorization in a hot metal tank and decarburization using semi-steel with nearly zero phosphorus load in a converter includes the following steps: putting an efficient dephosphorization agent into the hot metal tank in advance, and conducting dephosphorization during blast furnace tapping and transportation of blast furnace hot metal by the hot metal tank to obtain semi-steel with [P] less than 0.04 wt. % and [C] greater than or equal to 3.5 wt. %; and removing dephosphorization slag, and pouring the semi-steel into the converter for decarburization to obtain molten steel. The efficient dephosphorization agent includes iron oxide scale, lime, and composite calcium ferrite. According to the method, a phosphorus content of the blast furnace hot metal is reduced to be less than or equal to 0.04 wt. % through the efficient dephosphorization agent.