Wang Chengyan

University of Science and Technology Beijing

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Xu Kuangdi

Chinese Academy of Engineering

Yong‐Qiang Chen

University of Science and Technology Beijing

Jialiang Zhang

Beijing Municipal Ecology and Environment Bureau

Yongqiang Chen

Beijing Municipal Ecology and Environment Bureau

Baozhong Ma

University of Science and Technology Beijing

Miao Xu

Hefei University of Technology

Yu Zhu

University Town of Shenzhen

Yang Gao

Shanxi Normal University

Bao Liu

Lanzhou Institute of Chemical Physics

Shuo Wang

Nanjing University of Aeronautics and Astronautics

Cooperative Institutions

University of Science and Technology Beijing

Chinese Academy of Sciences

Peking University

Center for Life Sciences

Tsinghua University

Beijing General Research Institute of Mining and Metallurgy

University of Chinese Academy of Sciences

Wuhan University of Technology

Shanghai Jiao Tong University

Beijing Municipal Ecology and Environment Bureau

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Hydrochloric acid leaching mechanism of recycling cobalt and copper material from lithium-ion battery

Chemical Engineering(China) (2010)

Wang Chengyan

The materials recycled from the roasted spent lithium-ion batteries were analyzed by chemical phase and SEM micrograph,and the hydrochloric acid leaching mechanism was studied by thermodynamics principium,and validated by the experiments.The results show that this material contains high-grade cobalt and copper existing as metal and different valence state oxides.Besides CoO,Co and CuO can dissolve in acid easily,Co has a priority for substitutional deposits of Cu2+;Co3O4 and Co2O3 can be reductively leached by HCl;Cu2O may occur a disproportionating reaction;Cu can be leached finally by chlorination;parts of Cu have a course of dissolution-cementation-redissolution in leaching system.The thermodynamic study indicates that the method is feasible,and the interaction of cobalt and copper component in the leaching system is propitious to increasing the leaching efficiency.HCl leaching experiments support the conclusions,and the leaching efficiency of cobalt and copper can reach 99.3% and 95.9% respectively when leaching at 318 K with 2 mol/L HCl for 6 h,and volume mass ratio of liquid to solid(20 ∶1) mL/g,stirring speed at 200 r/min.

Hydrochloric acid

Lixiviant

Cementation (geology)

Selective leaching

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中国の亜鉛製錬技術の状況と発展傾向:鉛冶金【JST・京大機械翻訳】

Youse Jinshu Kexue yu Gongcheng (2016)

Wang Chengyan Yong‐Qiang Chen

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Lead Flash Smelting Process

The ECPH Encyclopedia of Mining and Metallurgy (2023)

Wang Chengyan Xu Kuangdi

Flash smelting

Lead smelting

10.1007/978-981-19-0740-1_759-1

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Preparation of flaky dihydrate zinc oxalate particles by controlled chelating double-jet precipitation

Advanced Powder Technology (2019)

Xing Chen Kai Huang Wang Chengyan

Sodium oxalate

Sodium citrate

Supersaturation

10.1016/j.apt.2019.06.013

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Study on the treatment of pyrolysis products from the nitric acid pressure leach liquor of limonitic laterite

Separation and Purification Technology (2024)

Weiwei Zhang Baozhong Ma Wang Chengyan Yong‐Qiang Chen

Laterite

Nitric acid

Lixiviant

Selective leaching

10.1016/j.seppur.2024.127780

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Modern Nickel and Cobalt Industry in China

The ECPH Encyclopedia of Mining and Metallurgy (2024)

Wang Chengyan

10.1007/978-981-99-2086-0_1349

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SEPARATION OF Cu, Ni AND Co FROM AMMONIA SOLUTION BY SOLVENT EXTRACTION

Nonferrous Metals (2002)

Wang Chengyan

Copper, nickel and cobalt are separated from ammonia solution by PT5050 solvent extraction The extraction rates of Cu 2+ and Ni 2+ reach to 99 5%, and Co 3+ is in the raffinate The stripping rate of Ni 2+ reaches to 99% by selectivity stripping, and Cu 2+ content in the Ni 2+ stripping liquor is 0 001g/L, It applys to produce cathode nickel Copper is stripped by high concentration solution (180 g/L H 2SO 4), and producing cathode copper or copper sulfate Cobalt in raffinate is cemented by Na 2S, the grade of cobalt in precipitate is higher than 40%, and the recovery is higher than 96%

Raffinate

Stripping (fiber)

Cobalt extraction techniques

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リチウムイオン電池の焼成生成物相と浸出分析【JST・京大機械翻訳】

Xiyou Jinshu (2009)

Li Dunfang Wang Chengyan Yin Fei Yong‐Qiang Chen Xiaowu Jie

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Co-Cu-Fe alloy recycled from spent lithium ion batteries by reducing smelting process

Materials Science and Technology (2010)

Yuan Wen-hui Dingfan Qiu Wang Chengyan

To efficiently recycle valuable metals from spent lithium ion batteries,a new method of recycling spent lithium ion batteries by carbon reducing smelting process was studied.The Co-Cu-Fe alloy and slag smelted from lithium ion batteries were investigated by means of chemical analysis,XRD,SEM and EDS.Test results show that it is feasible to use carbon as reducing agent,and the main valuable metals can be gathered into Co-Cu-Fe alloy;furthermore,aluminum foils in lithium ion batteries can be used as metallic reducing agent to reduce cobalt oxides.Parts of cobalt and copper are still mechanically entrained in slag in the form of fine particles,which leads to the loss of valuable metal from alloy.The problems to be resolved are reducing the loss in the slag and increasing the recovery ratio of cobalt and copper in the alloy.The corrosion of lithium to alumina refractory materials can not be ignored as well.

Reducing agent

Slag (welding)

Carbon fibers

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CROSS-SECTIONAL TEXTURES OF MESOPHASE PITCH-BASED CARBON FIBERS WITH DIFFERENT SHAPES

Wang Chengyan

The textures of circular, hollow, ribbon-shaped and Y-shaped mesophase pitch-based carbon fibers were observed on the broken cross-section by using a field emission scanning electron microscope (FE-SEM ). The formation process of the textures during the spinning was analyzed with the theory of rheology. It was inferred for the hollow fibers that the largest flow-rate line of pitch fluid should be at the position inside the center line of the spinneret, which had been proved based on the photographs of the fibers. The special texture of the ribbonshaped carbon fibers prepared from the catalytically condensed mesophase pitch was caused by the rheological property of the mesophase pitch and the arc ends of the ribbon-shaped spinneret. Noncircular mesophase pitch-based carbon fibers were found tending to be line-origin textures, which could avoid stress-concentrating and cracking during heat-treatment and be helpful for carbon fibers to improve their compressive strength.

Texture (cosmology)

Ribbon

Carbon fibers

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