Article
Green & Sustainable Science & Technology
Shicong Yang, Xiaohan Wan, Kuixian Wei, Wenhui Ma, Zhi Wang
Summary: This study provides a new sustainable concept for silicon recovery from diamond wire saw silicon powder waste, and reveals the relationship between metal impurities and the SiO2 shell.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Shicong Yang, Xiaohan Wan, Kuixian Wei, Wenhui Ma, Zhi Wang
Summary: The recovery of silicon from DWSSP waste is important for increasing production profits and reducing ecological harm. The purity of recovered silicon powder is influenced by the efficiency of acid leaching pretreatment. This study examines the dissolution behavior of retained metallic impurities, particularly focusing on the example of Al dissolution in HCl solution, providing insights for further purification processes.
Article
Green & Sustainable Science & Technology
Xing Jin, Songlin Ran, Zheyu Fang, Hongli Xu, Pengfei Xing
Summary: In this study, silicon nitride was prepared through the nitridation method using diamond-wire saw silicon powder (DWSSP) solid waste from the photovoltaic industry. The nitridation dynamics and reaction mechanisms of DWSSP were investigated. The results showed that the morphology and composition of the products were mainly determined by the nitriding temperature and time. Two paths to destroy the dense silicon oxides shell were identified during the nitridation process.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Jian Kong, Donghui Wei, Pengfei Xing, Xing Jin, Yanxin Zhuang, Shu Yan
Summary: This paper explores an effective method to recycle silicon powder waste (SPW) by vacuum refining process to produce high-purity silicon ingots. The research shows that vacuum smelting can significantly increase the silicon recovery ratio compared to atmosphere smelting, leading to both resource reutilization and economic benefits.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Huazhen Gu, Jing Cao, Jijun Wu, Min Xu, Wenhui Ma
Summary: This paper investigates the possibility of metal thermal reduction of Ti-bearing blast furnace slag (TBFS) using the molecular interaction volume model (MIVM). The study focuses on the recovery of titanium (Ti) and silicon (Si) from TBFS and diamond wire saw silicon powder (DWSSP) waste using metal thermal reduction and electromagnetic separation technique. The results show that the addition of CaF2 improves the separation of the alloy from the slag. Si and TiSi2 are the main phases in the recovered alloy.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Zhaoyang Zhang, Xiaolin Guo, Yaoxuan Wang, Donghui Wei, Hong Wang, Haiyu Li, Yanxin Zhuang, Pengfei Xing
Summary: This study analyzed the leaching process of iron impurity from diamond wire saw silicon powder (DWSSP) using hydrochloric acid (HCl). The results showed that iron was present as ions in the solution, and the leaching rate reached 98.37% at the optimal parameters (HCl concentration of 12 wt%, leaching temperature of 333 K, liquid-solid ratio of 15 mL/g). The leaching kinetics followed the secondary reaction model of the homogeneous model, which was consistent with the porous structure of DWSSP.
Article
Engineering, Chemical
Guangyu Chen, Yan Li, Wang Sheng, Liuqing Huang, Lizhi Tang, Xuetao Luo
Summary: This study proposes a method of using mixed sintering aids to remove the SiO2 surface layer and impurity boron from diamond wire saw silicon powder waste. Through sintering aids mixing and smelting treatment, the SiO2 layer can be digested and boron removed effectively. Experimental results show that a small amount of sintering aids can achieve significant boron removal effect.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Chemical
Zhaoyang Zhang, Xiaolin Guo, Yaoxuan Wang, Haiyu Li, Hongbing Du, Yanxin Zhuang, Pengfei Xing
Summary: Recycling diamond wire saw silicon powder (DWSSP) to prepare low-boron silicon is crucial for environmental protection and resource recycling. This study investigated the addition of MgF2 for sintering to decompose SiO2 layers and the effect of Na2CO3 on removing boron impurities. The results showed that MgF2 effectively decomposed SiO2 layers and the addition of Na2CO3 enhanced the removal rate of boron impurities.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Green & Sustainable Science & Technology
Shicong Yang, Xiaohan Wan, Kuixian Wei, Wenhui Ma, Zhi Wang
Summary: The study showed that NaCl and Na3AlF6 can improve the efficiency and purity of silicon recovery from waste material through optimization of the smelting process, providing technical and economic feasibility for large-scale remanufacturing.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Engineering, Chemical
Shicong Yang, Xiaohan Wan, Kuixian Wei, Wenhui Ma, Zhi Wang
Summary: This study introduces a novel process of chlorination with CaO smelting treatment for recycling silicon and removing Fe and Ni from DWSSP waste, achieving high-purity silicon and reducing waste disposal costs. The results show that SiO2 can be absorbed by CaO, while NaCl-MgCl2 eutectic plays a crucial role in reducing slag viscosity and removing metals.
MINERALS ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Donghui Wei, Jian Kong, Zhaoyang Zhang, Pengfei Xing, Yanxin Zhuang
Summary: In this paper, a slag refining process using CaO as fluxing agent was proposed to recycle Si from SCW for producing high-quality silicon. The influences of CaO addition amount and refining time on recovery ratio of SCW and purity of Si products were investigated. Under the optimized conditions, the recovery ratio of SCW and the purity of Si products can achieve 59.59% and 99.56%, respectively. The method was successfully applied in industrial-scale experiments with a SCW recovery ratio of 60%. Economical evaluation shows that this method can bring enormous economic benefit ($0.98/kg SCW).
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Hongli Xu, Xing Jin, Xuetong Zhou, Xinghong Du, Pengfei Xing, Yanxin Zhuang
Summary: The study revealed that nickel additives have an accelerating effect on the nitridation process of diamond-wire saw powder, lowering the nitridation temperature and promoting the formation of α-Si3N4 nanorods. Additionally, nickel additives play a crucial role in the growth of nanorods by forming a liquid Ni-Si alloy in the product.
Article
Chemistry, Physical
Osamu Kamiya, Mamoru Takahashi, Yasuyuki Miyano, Shinichi Ito, Masanobu Nakatsu, Hiroyuki Mizuma, Yuichi Iwama, Kenji Murata, Junpei Nanao, Makoto Kawano, Arata Maisawa, Takashi Kazumi
Summary: This study demonstrates the successful use of the diamond-saw-wire cutting method to cut single-crystal diamond substrates. By developing a unique saw-wire fixed diamond-grain and using a bronze solder with a metallic compound, researchers were able to achieve the desired cutting result. The experiment revealed a linear relationship between cutting depth and wire feed distance, and the life of the saw-wire exceeded expectations.
Article
Engineering, Electrical & Electronic
Zongqiang Li, Peiqi Ge, Wenbo Bi, Chengyun Li, Chao Wang, Jianfeng Meng
Summary: This paper investigates the influence of anisotropy and surface shape deviation on the cutting process of single crystal silicon, and verifies the effect of feed angle of the diamond wire saw on surface shape deviation through experiments. It proposes methods to reduce the impact of silicon anisotropy and surface shape deviation.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Analytical
Tengyun Liu, Yancai Su, Peiqi Ge
Summary: This study investigates the breakage ratio of silicon wafers, revealing that transverse vibration is the main cause of wafer breakage. The amplitude, maximum stress, and breakage rate of wafers increase with cutting depth and thinner wafers have a higher breakage ratio.
Article
Engineering, Chemical
Yunfei Yu, Xue Yang, Chenchen Zhang, Jie Chen, Wei Lin, Jianqiang Meng
Summary: This study reports an environmentally friendly and simple approach for preparing double-network (DN) ion gel membranes with high strength and excellent gas separation performance. By optimizing crosslinking density, mass ratio, and the type and content of free ionic liquid, the mechanical and gas separation properties of the DN membrane are improved.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Si-qi Jiang, Qiang Gao, Xi-guang Li, Chao-zhu Deng, Jun Qiu, Xiang-nan Zhu
Summary: A dual-strengthening pretreatment method is proposed to remove PVDF more efficiently and enhance the leaching of LiCoO2. Experimental results show that dual-strengthening pretreatment can effectively remove PVDF and significantly improve the leaching efficiency compared to single pretreatment methods.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zengchi Hu, Xiaoyu Wang, Xiaohui Zhang, Xue Li, Jiangbin Xia
Summary: The rapid fabrication of high-performance composite membranes based on CMPs using simple and low-cost methods is challenging. In this study, three CMPs-based composite membranes were rapidly fabricated with adjustable size using unidirectional diffusion synthesis. The microstructural design enhanced the rejection rates of the membranes and they showed strong hydrolytic resistance, thermal stability, and acid-base resistance. Electrostatic adsorption and the adjustable microstructures significantly varied the repellence of the membranes to different charged molecules.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Farzaneh Rouhani, Matineh Ayedi, Nasser Safari
Summary: Introducing defects into porous metal-organic frameworks is important for improving their adsorption performance. Quasi-MOFs, an underutilized variant of large-scale, fundamentally deficient MOFs, have been found to have substantial amounts of unsaturated metal sites to offset the drawbacks of MOFs. In this study, a quasi-MOF was produced using a water-stable MOF and demonstrated significantly improved phosphate adsorption capability due to the presence of defect sites.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Valentin Reungoat, Morad Chadni, Louis M. M. Mouterde, Fanny Brunissen, Florent Allais, Helene Ducatel, Irina Ioannou
Summary: This study focuses on the recovery of sinapic acid using liquid-liquid extraction assisted by a hollow fiber membrane contactor from an aqueous feed obtained through the hydrolysis of mustard bran. The screening of solvents of different chemical nature showed that all tested solvents had an extraction efficiency of more than 80% for pH < 5. Four solvents were selected for use in the hollow fiber membrane contactor, and the volatile solvents showed higher mass transfer coefficients compared to non-volatile solvents. The extraction efficiency was intensified by increasing the initial concentration of sinapic acid and the feed-to-solvent ratio. CPME was found to have optimal recovery efficiency at a phase ratio of 8:1, yielding 0.9 g of sinapic acid per liter of CPME used.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Takahiro Sakamoto, Takafumi Hanada, Hayate Sato, Mayu Kamisono, Masahiro Goto
Summary: The emergence of the battery society has led to a high demand for battery metals, resulting in a strain on their supply. This study introduces a novel technique using a hydrophobic deep eutectic solvent (DES) for leaching and recovering battery metals from low-grade nickel laterite ores. The DES enables selective leaching and recovery of the metals, offering a promising pathway for the extraction of critical battery metals.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Rongrong He, Jiarui Chen, Chunyao Zhang, Dan Lu, Lin Zhang, Tao He
Summary: Researcher has developed a method to quantify the charge density in nanofiltration (NF) membrane separation layer and applied it in NF membranes that can separate Mg2+ and Li+. The results showed that overcompensated amine groups played a major role, and there was a linear relationship between charge density and coating bi-layers or PAH layers.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Zhijian Zhang, Min Chen, Zhe Lin, Zhichao Yang, Yafeng Du, Zhihui Chen, Zhenhao Yang, Kongyin Zhao, Ligang Lin
Summary: Membrane technology plays an important role in molecular/ion separation processes, but faces challenges such as membrane fouling. This study introduces a new ion-crosslinking method to fabricate copper alginate hydrogel membranes with improved mechanical strength and antimicrobial capabilities. The membranes exhibit excellent separation performance and enhanced long-term molecule/ion separation through improved anti-swelling properties. Molecular dynamics simulations and life cycle analysis highlight the pore structure and environmental friendliness of the hydrogel membranes. These findings provide valuable insights for developing sustainable hydrogel membranes with stable performance and high separation efficiency.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Dongmei Liu, Aiying Guo, Yanling Qi, Zhixin Ji, Hongjuan Li, Zhiwei Zhang, Xinyue Zhang, Kunze Wu, Aijun Cai
Summary: In this study, a stable magnetic Mg/Mn-layered double oxide-doped biochar composite (MgMnLDO-MBC) was prepared and successfully used for the removal of antibiotics and bacteria from wastewater. The composite exhibited enhanced surface areas, adsorption sites, and free radicals, leading to improved catalytic activity. The effects of different factors on the removal efficiency were evaluated, and the composite showed good reusability.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Feng Wang, Zhaoyong Bian, Yaru Zhang, Wenchao Yu, Qiang Zhang, Hui Wang
Summary: In this study, a nanofibrous layered structure of Ff-Ti3C2Tx-Co3O4 was prepared by self-assembling nanofibrous Co3O4 with lamellar fluorine-free MXene (Ff-Ti3C2Tx). The Ff-Ti3C2Tx-Co3O4 exhibited excellent catalytic activity for degradation, resistant to ionic interference, and maintained high removal efficiency of sulfamethoxazole (SMX) in municipal wastewater. The rapid SMX degradation involved fast electron transfer in redox cycles with PMS and the generation of 1O2 via PMS ->center dot O2 -> 1O2. This work provides new insights into antibiotic degradation mechanisms and electron transfer based on PMS activation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Weipeng He, Jiacheng Luo, Yujie Wu, Tianhao Luo, Chen Tang
Summary: This study comparatively evaluated the role of cationic, anionic, and nonionic polyacrylamides (PAMs) in ballasted flocculation of clay suspensions under different aluminum sulfate (AS) coagulant dosages. The selection of PAMs and AS dosage had a significant influence on the size and shear resistance of ballasted floc aggregates.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Lixian Wang, Lizhi Zhao, Didi Si, Zhixin Li, Huiqin An, Hui Ye, Qingping Xin, Hong Li, Yuzhong Zhang
Summary: Metalloporphyrin-based nanozymes integrated with poly (vinylidene fluoride) membrane show high catalytic activity and reusability for the decolorization of Congo Red dye in continuous flow process.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Yongfei Ma, Chenyu Zeng, Yongzhen Ding, Jiayi Tang, Ondrej Masek, Zhikang Deng, Rui Mu, Zulin Zhang
Summary: In this study, sludge-derived biochar (SBC) was functionalized with various iron salts to enhance its adsorption ability for sulfamethoxazole (SMX) and magnetic collection performance. Ball milling was further employed to treat the optimal iron salt functionalized SBC (MSBC), resulting in ball milled SBC (BMSBC) with improved adsorption performance for SMX. The dominant driving mechanism for SMX adsorption onto BMSBC was confirmed to be multiple physicochemical forces, including 7C-7C conjugation, pore filling, H-bonding, Fe-O complexation, and electrostatic interactions. BMSBC exhibited favorable adsorption ability for SMX in actual waters and could be easily collected within 1 min due to its magnetic sensitivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Jinglin Tan, Xiaohui Mao, Wenjihao Hu, Hongbo Zeng
Summary: This study investigates the influence of PDMS chain architectures on surface properties and reveals that PDMS coatings with looped structures exhibit superior hydrophobicity, self-cleaning, and water sliding compared to coatings with linear structures. Additionally, both looped and linear PDMS coated stainless steel mesh/polyester fibers show efficient separation of oil/water mixture.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)
Article
Engineering, Chemical
Wei-Liang Chen, Chih-Chia Cheng, Chien-Hsing Lu, Jem-Kun Chen
Summary: This study designs a novel sandwich-structured capacitor that reduces the absorption time of pollutants using dielectrophoresis force. By coating graphene oxide on polystyrene microspheres as adsorbents and encapsulating them within the capacitor, the adsorption rate is significantly enhanced. Additionally, frequency manipulation allows for the recycling of adsorbents and concentration of dyes, minimizing secondary pollution.
SEPARATION AND PURIFICATION TECHNOLOGY
(2024)