APPLIED CATALYSIS B-ENVIRONMENTAL
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2022
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IF 24.319
Daoyuan Zu,Haoran Song,Changping Li,Yuwei Wang,Rong Du,Rui Zhou,Wei Zhang,Shiting Pan,Yang Cai,Yongming Shen,Zhifeng Yang
Self-catalyzed decomplexation of Cu-ethylene diamine tetraacetic acid complex (Cu-EDTA) and recovery of Cu without addition of extraneous transition metals were achieved in Ti 3 C 2 T x MXene/peroxymonosulfate (Ti 3 C 2 T x /PMS) process. Free radical quenching experiments and electron spin resonance (ESR) measurements demonstrated that both hydroxyl radical (HO • ) and sulfate radical (SO 4 •- ) contributed to the degradation of Cu-EDTA. Activation of PMS by Ti 3 C 2 T x initiated Cu-EDTA decomplexation and released free Cu ions . Then, the formation of Ti-O-Cu bonds between Cu ions and Ti 3 C 2 T x accelerated the electron transfer from Ti 3 C 2 T x to Cu(Ⅱ) and triggered Cu(Ⅱ)/Cu(Ⅰ) cycle, which further enhanced PMS activation and led to the self-catalyzed decomplexation of Cu-EDTA. Simultaneous recovery of Cu was achieved due to the excellent absorption performance of negative charged Ti 3 C 2 T x towards Cu ions. This study revealed the self-catalyzed decomplexation mechanism of Cu-EDTA in the Ti 3 C 2 T x /PMS process and provided a feasible strategy for heavy metal complexes treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2024
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IF 4.9
Qiang Zhang,Yongsheng Sun,Guanda Wu,Xinlei Wei,Peng Gao
Chrysocolla is an important refractory copper oxide ore. The sulfidation roasting using pyrite as a sulfidation agent was conducted on the chrysocolla. A copper recovery of 87.31 % was obtained with butyl xanthate. Thermodynamic analysis indicated that the predominant equilibrium product was Cu 2 S. Excessive pyrite dosage resulted in an overproduction of by-products, and a satisfactory equilibrium composition can be obtained at a roasting temperature above 500 °C. The main gas product was SO 2 , with no H 2 S generated. The roasting process involved the dehydration of chrysocolla, forming copper oxides that reacted with S released from pyrite pyrolysis. The sulfidation reaction gradually proceeded from the particle surfaces to the interiors with the gradual S diffusion. Even with satisfactory copper recovery, a significant amount of copper oxides remained within the particles. This was because xanthate primarily adsorbed onto the particle surface, implying that complete copper mineral phase reconstruction may be unnecessary for efficient flotation.
研究领域:
冶金学
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矿物加工工程
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
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IF 9.136
Zhiwei Wang,Zhi Li,Jiaojiao Bu,Juanjian Ru,Yixin Hua,Ding Wang
Cuprous sulfide (Cu 2 S) is the main composition of chalcocite and widely used in the catalyst. Deep eutectic solvents (DESs) are eco-friendly electrolytes for the separation and recycling of metals and their compounds in addition to environmental protection. In this work, choline chloride-ethylene glycol (ChCl-EG) DES is innovatively used towards one-step desulfurize cuprous sulfide to recycle copper for the first time. Cyclic voltammetry is employed to investigate the effect of initial potential, scan rate and temperature on the electrochemical behavior of Cu(I) in ChCl-EG DES. The effect of essential parameters (applied voltage, temperature and NH 4 HCO 3 ratio) on the chemical composition and microstructure of the product are discussed. Pure polycrystalline nano-Cu with an average size of ≈16.15 nm can be obtained with the current efficiency of 96.58% at the optimized parameters of 2.5 V, 353 K, 40% NH 4 HCO 3 and 10 h. The structure of Ch + is unbroken and the main existence form of Cu(I) is CuCl 2 − in the electrolyte. Mechanism analysis indicates the reduction of Cu 2 S to Cu is step-by-step with the feasible process of Cu 2 S→Cu 1.96 S→Cu 7.2 S 4 …→Cu. The S element is possibly converted and stabilized as the sulfate (SO 4 2− ) in the DES. All these findings are expected to provide new feasibility for the direct extraction and recycling of Cu from Cu 2 S with high current efficiency and less hazardous.
研究领域:
材料科学
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环境科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
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2023
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IF 4.1
Ping Ouyang,Rui Zhang,Jian Zhou,Haiyan Liu,Zhichang Liu,Chunming Xu,Xiangping Zhang,Shaojuan Zeng,Qian Su,Xianghai Meng
Critical processing protocols of industrial bimetallic composite ionic liquid (IL) are necessary to assure good mass transfer rates for process optimization and efficient metal recovery. Here, the effects of different conditions on the electrochemical behavior and copper recovery from the industrial bimetallic composite IL are crucial for effective resource utilization. Cyclic voltammetry (CV) shows that the reduction of Cu(I) to Cu(0) during the cathodic reduction region is the irreversible diffusion-controlled process, and the diffusion coefficient increased with temperature which indicated that increasing temperature could promote the diffusion and mass transfer. During electrodeposition, metallic copper is obtained exclusively on the cathode, while CuCl2 accumulates exclusively on the anode. Scanning electron microscopy shows that the micron-size electrodeposits become larger and significantly rougher with increasing temperature and ultrasonic frequency, illustrating that these factors hasten the nucleation and crystallization rates at high overpotentials. The efficiency of copper recovery is greatly improved by employing high temperature and ultrasonic cavitation, and the highest values correspond to r = 76.9% at 80 °C and r = 63.6% at 40 kHz. The study lays the foundation for efficient and rapid recovery of copper from spent ILs.
研究领域:
化学工程
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
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IF 4.5
Kun WANG,Yan LIU,Jun HAO,Zhi-he DOU,Guo-zhi LV,Ting-an ZHANG
To recover copper from copper slag, a novel slag cleaning method was proposed. The thermodynamics and binary phase diagram of FeO–SiO 2 were calculated first. Then, the effects of experimental parameters on the reduction of Fe 3 O 4 , recovery of copper, and slag cleaning mechanism were investigated. The results showed that the addition of SiO 2 significantly reduced the initial reduction temperature of magnetite and pyrite. The contents of Fe 3 O 4 and copper decreased to 2.45 wt.% and 0.39 wt.%, respectively, with copper recovery of 92.52% under the optimum conditions. More than 94% silver and 99% gold subsided into the copper matte after slag cleaning. Approximately 72% of zinc and 75% of lead volatilized in the flue gas. The viscosity of the copper slag decreased from 0.68 to 0.12 Pa·s due to the reduction of magnetite. The sedimentation of copper matte droplets could be enhanced by mechanical stirring.
研究领域:
冶金工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2019
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IF 4.384
Wenying Guo,Sihai Zhang,Nengwu Zhu,Deliang Luo,Pingxiao Wu
In this study, a strategy was developed to directly recover high-purity Ag and other metals (especially Cu) from WECs to reduce the leaching of precious metals and promote the leaching of Cu and other metals. The results of SEM, EDS, XRD and ICP-OES clearly suggested that Ag and Cu were effectively released from WECs below 0.15 mm size, which contributed to the regulation of metals crystal types. The zero-valent copper from WECs was changed by roasting to form CuO and Cu 2 O, and the suitable samples of roasting at 400 °C for 3 h were confirmed experimentally. After the leaching processing under H 2 SO 4 (1 M) and H 2 O 2 (30%), the roasted particles were directly obtained, including Ag with 99.53 wt.% purity and more than 99.99% recovered, and Cu, Sn, Ni and Zn extracted by 99.67%, 90.71%, 73.05% and 99.32%, respectively. However, the unroasted particles would generate lower grade of Ag because other metals (e.g. Cu, Sn, Ni and Zn) were difficult to be leached from WECs. The leaching solution primarily included Cu ions (98.3%) and a little of the nickel (0.83%) and tin (0.86%) ions, which could recover copper by evaporation crystallization to form CuSO 4 (99.48 wt. %). The reaction mechanism of the process could be concluded that the copper state was transformed by mechanical separation and roasting to promote the leaching of various metals from Ag.
研究领域:
材料科学
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环境工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Shi-Kai Li,Yu-Jiao Wen,Yi-Fan Wang,Meng Liu,Zheng-jie Peng,Le-zhu Su,Zhi Zhou,Nan Zhou
The coexistence with other similar valence counterparts greatly hinders the selective recovery of metals, resulting in serious resource waste and environmental pollution. Herein, biochar with numerous surface –NO 2 and –COOH groups was prepared, and in-situ ammonization reaction was catalyzed by electricity to transform those attached –NO 2 into –NH 2 . The as-obtained biochar with stable ligand of –NH 2 (BC-NH 2 ) exhibited an excellent selective adsorption efficiency for copper. Among six bi-valence ions of copper, lead, cadmium, zinc, magnesium and calcium, the above adsorbent could selective recollect 88.76 % and 73.61 % of copper from aqueous and soil respectively. More importantly, the other existent bi-valence ions can be effectively substituted by Cu(II) with a high efficiency up to 91.92 %, even they were saturated on the BC-NH 2 . The Linear sweep voltammetry curves (LSV) and density functional theory (DFT) demonstrate the strongest affinity between Cu(II) and BC-NH 2 than that of other heavy metals, indicating the keynote of the selective mechanism should be the formation of ultra-stable complex between –NH 2 and copper ions. Besides, –COOH group participate the pathway for the transformation from –NO 2 to –NH 2 . This study provides a new concept, and an ideal material as well as novel preparing stratagem, for selective recollecting copper through chelating.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Yang Liu,Jun-xia Yu,Li Guo,Guoping Song,Xiaodi Li,Chunqiao Xiao,Fang Zhou,Ruan Chi,Guoqing Feng
A novel circulation system combined with coordination leaching and biosorption process was successfully used for the direct recycling of Cu 2+ from the electroplating sludge. Cu 2+ was firstly efficiently leached out from the sludge by the choosing organic acid, and then it was selectively adsorbed onto a modified sorbent from the lixivium containing other co-ions including Zn 2+ , Ca 2+ , Fe 3+ , Cr 3+ , and Mg 2+ under dynamic adsorption condition. The results of static leaching experiments and DFT calculations showed that citric acid showed the best leaching performance for Cu 2+ among the studied organic acids and the traditional inorganic acid (HCl). To selective recovery of Cu 2+ from the lixivium, ethylenediamine tetraacetic acid dianhydride (EDTAD) modified bagasse was prepared, and it had high adsorption capacity, selectivity, and good reusability toward Cu-citric acid complex. The adsorption isotherm for Cu matched with the Langmuir model with a maximum adsorption capacity of 52.2 mg/g. XPS and EXAFS analysis illustrated that the Cu-citric acid complex was broken by EDTA on the modified bagasse, and Cu 2+ enriched on the sorbent while citric acid was released into the lixivium again. In the combined leaching and sorption circulation system, Cu 2+ was simultaneously absorbed on the modified bagasse fixed bed column once it was leached out. Benefitting the recycling of citric acid and the continuous adsorbing of Cu of the circulation system, the leaching efficiency could be increased from 75.0 % to 92.4 %, even in the very dilute citric acid solutions (concentration of 0.01 mol/L). The combined methods could increase Cu recovery efficiency from the sludge at a low concentration of the leaching agent, which had great potential in the practical application.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
RESOURCES CONSERVATION AND RECYCLING
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2022
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IF 13.716
Longgong Xia,Shuheng Cao,Qihou Li,Xingwu Lu,Zhihong Liu
Copper smelting slag and gypsum residue are by-products in copper making processes, and both contain valuable elements, such as copper, sulfur, etc. However, there is more than 0.25 wt% Cu in the smelting slag, which cannot be recovered with present technologies. A sulfidation process, which used the gypsum residue as the sulfur resource, was proposed and studied in treating copper smelting slag. Obtained results showed: 1) CaSO 4 transformed to CaS under reductive decomposing conditions, and reactions between CaS and slag components occurred spontaneously during the slag cooling process; 2) the Fe/SiO 2 mass ratio of the slag, the CaS excess coefficient (α), and the cooling rate (v) had an influence on the terminal phase composition, sulfide particle size, etc.; 3) under optimized conditions (Fe/SiO 2 =1.0: α=5, v = 1.00°C/min; Fe/SiO 2 =1.3: α=4, v = 0.25°C/min; Fe/SiO 2 =1.8: α=5, v = 0.25°C/min), the Cu contents in non-sulfide phases were lower than 0.08 wt%, and the mean particle size of sulfides were 37- 40 μm, which were feasible for flotation recoveries. TCLP (Toxicity Characteristic Leaching Procedure) tests indicated that the co-treatment process improved the stability of these starting materials. Based on samples characterization and thermodynamic analysis, a corresponding reaction mechanism was proposed.
研究领域:
冶金工程
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环境科学
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产品关联
DOI
高影响因子
ISIJ INTERNATIONAL
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2024
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IF 1.6
Zhihao Lu,Xiangwei Liao,Chenglin Zhao,Deli Shang,Haiwei Wang,Chengjun Liu
This paper proposed an innovative electrochemical method for copper recovery from spent sulfide slag (Na2S-FeS-Cu2S), generated during copper removal from iron-based melts. It aims to reduce the high decopperization agents' consumption caused by low copper distribution ratio during the copper removal process, address the cost issues by recycle of slag and recovery of copper, and expand the application potential of the emerging copper removal method using the sulfide slag systems. The feasibility of electro-recovery of copper is verified by cyclic voltammetry tests and potentiostatic electrolysis experiments. The results show that in the Na2S-FeS-Cu2S melt, although copper cannot be reduced alone without reducing iron, rough separation can be achieved by controlling the temperature. The current efficiency of Cu+ reduction in the molten sulfide is about 9.1% due to electronic conduction in the sulfide melt, which needs further improvement. The slag treated by the innovative electrochemical process can be reused, as the XRD results show that it has a similar composition to the primary slag unused.
研究领域:
冶金工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2025
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IF 12.4
Liang Tian,Lei Jin,Ming Chen,Dafang Fu,Saina Zheng,Yajun Wang,Jianglei Xiong
Copper-containing industrial wastewater, characterized by strong acidity, high ionic strength, and various competing metals, presents significant challenges for Cu(II) recovery. To address these issues, an electric field-enhanced ultrafiltration process was developed, assisted with a functional polyelectrolyte with high selectivity for Cu(II). The polyelectrolyte, termed PPEI, was synthesized by grafting picolyl groups onto polyethyleneimine (PEI), enhancing its affinity for Cu(II). The captured Cu(II) was subsequently recovered through electrolysis, demonstrating a sustainable approach for both Cu recovery and PPEI recycling. The synthesis and stability of PPEI were confirmed through infrared spectroscopy, particle size analysis, and dialysis validation, ensuring its reliability in practical applications. The incorporation of picolyl groups onto PPEI enhances its selectivity for Cu(II) via coordination with two amines and four pyridyl groups per copper ion. Under acidic conditions, the maximum loading ratio of copper to PPEI is 1:4 with loading capacity of 119.4 mg/g, which increases to 1.5:4 (i.e., 179.1 mg/g) under neutral to alkaline conditions due to the deprotonation of excess amines. PPEI effectively removes Cu(II) from solutions under various harsh conditions at the loading ratio of 4, maintaining 92-98% removal efficiency in the presence of high salt concentrations (up to 1 M NaCl) and pH as low as 1, and approximately 85% removal in solutions with competing metal ions at concentrations up to 50 times higher than Cu. Scanning electron microscopy and membrane flux changes indicated that the application of an positive electric field significantly reduces membrane fouling and enhances Cu selectivity. The application of a +0.2 V voltage to the membrane side reduced the flux decline rate by 58%, significantly improving membrane performance while maintaining a Cu(II) removal efficiency of over 95%. Electrolysis optimized at a current density of ≤0.004 A/cm 2 achieved an 80% copper recovery while allowing PPEI to be released for recycling. Tests conducted using two types of real industrial wastewater demonstrated a copper removal rate of ∼95%, with a recovery rate of ∼80%. This study provides a novel and highly selective approach for the efficient recovery of valuable metals from industrial wastewaters.
研究领域:
环境科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
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2022
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IF 11.072
Jianyong Che,Wenjuan Zhang,Baozhong Ma,Chengyan Wang
A succinct process for recovering Cu from acidic waste etchant (AWE) was developed in this work, which included recycling Cu via oxalate precipitation, preparing CuO nanoparticles by thermal decomposing the precipitate, and recovering NaCl via evaporation crystallization. A comparison of copper precipitation by H 2 C 2 O 4 and Na 2 C 2 O 4 suggested that an efficient recovery efficiency of Cu was obtained by Na 2 C 2 O 4 (∼99%), which was higher than that by H 2 C 2 O 4 (80.31%). Through thermodynamic analysis, a H + -release mechanism was proposed to explain the significant difference in copper precipitation between Na 2 C 2 O 4 and H 2 C 2 O 4 . By parameter optimization, 99.8% of Cu was recovered without adjusting pH value under optimal conditions, such as temperature of 40 °C, sodium oxalate of 1.2 mol/mol, and reaction time of 2 h. Furthermore, CuO nanoparticles with a purity of 99.92% and particle size of 30 nm were prepared, and the phase transformation of Cu was investigated in-depth using X-ray diffraction (XRD), Scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FT-IR). Finally, the chloride ions were recovered as NaCl at 99.51% purity. This study provides a potential route to deal with strongly acidic waste etchant and achieve its high-value utilization.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）