公开(公告)号：US20230193488A1

公开(公告)日：2023-06-22

申请号：US18168819

申请日：2023-02-14

Applicant: Beijing University of Technology

Inventor： Xiaoli Xi ,  Liwen Zhang ,  Zuoren Nie

IPC: C25B11/042 ,  C25B1/01 ,  C01B32/949

CPC classification number: C25B11/042 ,  C01B32/949 ,  C25B1/01 ,  C01P2004/62 ,  C01P2004/64

Abstract: The present disclosure provides a method for in-situ synthesizing tungsten carbide powder. In this method, cemented carbide scrap is used as an electrode and the molten salt electrolysis process is used to in-situ synthesize tungsten carbide powder, where a bidirectional pulse is used in the molten salt electrolysis process. In the method provided by the present disclosure, by using the bidirectional pulse and using the cemented carbide scrap as electrode in the molten salt medium, when the tungsten carbide scrap is oxidized, tungsten is dissolved in ionic form, deposited after the direction of current changes, and reacted with the carbon anode sludge in situ to generate tungsten carbide powder. In the present disclosure, the carbon anode sludge is treated appropriately, the recycled product can be used in upmarket application, there is no need to apply complicated processes to process the tungsten powder into tungsten carbide, and the tungsten carbide nanopowder with high-performance can be recycled and prepared in a short process.

公开(公告)号：US10519556B2

公开(公告)日：2019-12-31

申请号：US14908495

申请日：2014-07-30

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Zuoren Nie ,  Xiaoli Xi

IPC: C25C3/34 ,  C25C7/00

Abstract: The present invention provides a process for recycling waste carbide, wherein the waste carbide is directly used as anode and electrolyzed in the molten salt, comprising the following steps: 1) the vacuum dehydrating of the molten salt electrolyte; 2) electrolyzing the waste carbide, which is used as anode, and an inert electrode, which is used as cathode in the molten salt electrolyte with the electrolysis temperature of 350˜1000° C.; 3) separating and collecting the metal powder obtained by electrolysis from molten salt medium. According to the technical solutions of the present invention, tungsten and cobalt ions can be dissolved from the anode material-waste carbide directly into the molten salt medium and deposited on the cathode plate with being driven by the electrolysis voltage, to obtain the metal powder particles. The tungsten, cobalt and other products obtained by electrolysis can be used as carbide materials, high temperature structural materials, weapons materials, photocatalytic materials, etc., and can be applied to the fields of processing production, aerospace, military industry, environment and energy, and the like. This method has a short process, has no solid/liquid/gas waste emissions, and is environment-friendly.

公开(公告)号：US11008638B2

公开(公告)日：2021-05-18

申请号：US16713921

申请日：2019-12-13

Applicant: Beijing University of Technology

Inventor： Xiaoli Xi ,  Zhengzheng Zhang ,  Liwen Ma ,  Zuoren Nie

IPC: C22B23/00 ,  C22B3/00 ,  C22B7/00

Abstract: A method for separating nickel and cobalt from a solution includes the steps of: obtaining a solution containing nickel and cobalt by acid leaching of a cathode material of a waste lithium-ion battery, adjusting the pH of the solution containing nickel and cobalt to 3.5 to 4.5, adding extractants for extraction to separate the nickel and the cobalt. The cobalt enters the organic phase, the nickel remains in the aqueous phase, and the extractants contain an acidic extractant and an alkaline extractant. The method for efficiently separating nickel and cobalt through extraction adopts a non-saponification extraction method without using NaOH as a saponifier, thereby avoiding the discharge of saponification wastewater. Under acidic conditions, the cobalt in an acidic leaching solution is effectively extracted and separated into the organic phase through synergistic action of the acidic extractant and the alkaline extractant, thereby realizing the separation of nickel from cobalt.

公开(公告)号：US09957587B2

公开(公告)日：2018-05-01

申请号：US14903513

申请日：2014-06-26

Applicant: Beijing University of Technology

Inventor： Xiaoli Xi ,  Zuoren Nie ,  Xiaokai Sun ,  Liwen Ma

IPC: C22B11/00 ,  C22B3/00 ,  C22B3/22 ,  C22B3/44 ,  C22B3/26 ,  C22B3/28 ,  C22B3/34

CPC classification number: C22B11/04 ,  C22B3/0009 ,  C22B3/0012 ,  C22B3/0031 ,  C22B3/22 ,  C22B3/44 ,  Y02P10/234

Abstract: The present invention relates to a process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction, wherein isoamyl alcohol is used as extracting agent and 2-methoxyphenyl thiourea is used as extraction-assisted complexing agent. 2-methoxy-phenyl thiourea is added to aqueous phase to react with platinum and palladium, and isoamyl alcohol is used as extracting agent to extract the organic phase, thus realizing the purpose of separating and extracting noble metals from base metals while enriching noble metals of platinum and palladium. The present invention, which can not only realize the separation of noble metals and base metals, but also enhance the enrichment and recovery ratios of noble metals of platinum and palladium, with low cost reagents, small influence on the environment and simple technical process, thus is a new and efficient extraction and enrichment system for noble metals.

公开(公告)号：US20160153066A1

公开(公告)日：2016-06-02

申请号：US14903513

申请日：2014-06-26

Applicant: BEIJING UNIVERSITY OF TECHNOLOGY

Inventor： Xiaoli Xi ,  Zuoren Nie ,  Xiaokai Sun ,  Liwen Ma

IPC: C22B3/00 ,  C22B3/22 ,  C22B3/44

CPC classification number: C22B11/04 ,  C22B3/0009 ,  C22B3/0012 ,  C22B3/0031 ,  C22B3/22 ,  C22B3/44 ,  Y02P10/234

Abstract: The present invention relates to a process for efficiently enriching and recovering noble metals of platinum and palladium based on solvent extraction, wherein isoamyl alcohol is used as extracting agent and 2-methoxyphenyl thiourea is used as extraction-assisted complexing agent. 2-methoxy-phenyl thiourea is added to aqueous phase to react with platinum and palladium, and isoamyl alcohol is used as extracting agent to extract the organic phase, thus realizing the purpose of separating and extracting noble metals from base metals while enriching noble metals of platinum and palladium. The present invention, which can not only realize the separation of noble metals and base metals, but also enhance the enrichment and recovery ratios of noble metals of platinum and palladium, with low cost reagents, small influence on the environment and simple technical process, thus is a new and efficient extraction and enrichment system for noble metals.

Abstract translation: 本发明涉及一种有效富集和回收基于溶剂萃取的铂和钯贵金属的方法，其中使用异戊醇作为萃取剂，并使用2-甲氧基苯基硫脲作为提取辅助络合剂。 将2-甲氧基 - 苯基硫脲加入水相中与铂和钯反应，并使用异戊醇作为提取剂萃取有机相，从而实现从贱金属中分离和提取贵金属同时富集贵金属的目的 铂和钯。 本发明不仅可以实现贵金属和贱金属的分离，而且可以提高铂和钯贵金属的富集和回收率，低成本试剂，对环境的影响小，工艺流程简单 是贵金属的新型高效提取和富集系统。