MINERALS ENGINEERING
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2021
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IF 4.765
Xun Wang,Jie Liu,Yimin Zhu,Yanjun Li
To achieve the efficient flotation separation of cassiterite from fluorite, an eco-friendly depressant, the disodium salt of adenosine 5′-triphosphate (Na 2 ATP), was employed for the selective depression of fluorite. The performance of Na 2 ATP as a depressant in the flotation of cassiterite and fluorite was evaluated by micro-flotation experiments in a sodium oleate (NaOL) system. The flotation tests revealed that Na 2 ATP significantly depressed the flotation of fluorite compared to that of cassiterite, and excellent separation was achieved using 1.0 mM Na 2 ATP and 0.14 mM NaOL at pH 8.02. Moreover, the mechanism of the selective depression Na 2 ATP on the two minerals was revealed by surface analyses, revealing that chemisorption between the phosphate group of Na 2 ATP and the calcium ions on the fluorite surface was responsible for the selective adsorption of Na 2 ATP on fluorite, and the significant pre-adsorption of Na 2 ATP onto the fluorite surface impeded the further adsorption of NaOL. However, because Na 2 ATP was adsorbed on cassiterite by physisorption, which is relatively weak, the strong chemisorption of NaOL on cassiterite occurred regardless of pre-treatment with Na 2 ATP. Furthermore, density functional theory calculations revealed that the adsorption mode of Na 2 ATP to be “horizontal” and to occur at multiple calcium-ion sites on the fluorite surface. In summary, Na 2 ATP is a suitable high-efficiency depressant for the separation of cassiterite from fluorite by direct flotation.
研究领域:
矿物加工工程
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表面化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Weiduo Zhao,Zhongwei Zhao,Yingpeng Xu,Ziming Cao,Tianyu Zhao
High-chromium vanadium slag, a typical hazardous solid waste, serves as a critical raw material for the comprehensive utilization of vanadium and chromium resources. To achieve synergistic recovery of vanadium and chromium, this study proposes an innovative process based on mineral phase reconstruction. A ternary eutectic multi-reaction system was established, and a novel Na 2 CO 3 -CaO co-roasting-leaching method was developed to enable selective separation of V and Cr. Combining DFT calculations, pure mineral roasting experiments, and actual vanadium slag roasting validation, the transformation mechanisms were elucidated: vanadium was converted into water-insoluble NaCaVO 4 and CaVO 3 , while chromium existed as water-soluble Na 2 CrO 4 during the Na 2 CO 3 -CaO co-roasting process. Under optimized conditions (roasting temperature 900 °C, duration 90 min, molar ratio n(CaO)/n(Na 2 CO 3 ) = 1), the average leaching efficiencies reached 84.23 % for Cr in the first-stage water leaching and 86.52 % for V in the second-stage ammonium bicarbonate leaching. The Cr concentration in the water leaching solution was 4.1 g/L (V: 0.7 g/L), whereas the V concentration in the ammonia leaching solution significantly increased to 7.1 g/L (Cr: 0.8 g/L). Impurity ions (Fe, Mn, Ti, Si) in both leaching solutions remained below 0.05 g/L. The remarkably low impurity levels substantially reduced purification costs, and the distinct concentration differences between V and Cr highlighted the selective separation advantages of the proposed process. These integrated characteristics provide critical feasibility support for industrial-scale implementation.
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
Journal of Environmental Chemical Engineering
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2022
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IF 7.968
Yanfang Huang,Kunpeng Shi,Shengpeng Su,Bingbing Liu,Hu Sun,Guihong Han
Selective separation of molybdenum(Mo) and vanadium(V) from hazardous secondary resources containing Mo and V has become a technical bottleneck of its resource utilization. In this work, the selective separation of Mo and efficient recovery of V from simulated leaching solutions of spent hydrodesulfurization (HDS) catalysts were investigated via solvent extraction and chemical precipitation . The result indicates that the D 2 EHPA(P204) exhibits higher selectivity for Mo in strongly acidic conditions. Under optimum experimental conditions of hydrochloric acid of 1 mol/L, extractant concentration of 20 % (v/v), O/A ratio of 1:3 and contact time of 50 min, the single-stage extraction ratio of Mo reached 98.63 %, meanwhile, the co-extraction ratio of vanadium was less than 5 %. Additionally, over 97 % of Mo could be stripped from loaded organic phase at O/A ratio of 1 with 50 g/L NH 4 HCO 3 . The mechanism analysis revealed that selective extraction of Mo was mainly through the cation exchange mechanism. Moreover, the enthalpy changes in the molybdenum extraction were 44.1 kJ mol −1 , which demonstrated that was an endothermic reaction . Furthermore, the Fe(III) was adopted to fabricate FeVO 4 by precipitating vanadium from raffinate, and the precipitation efficiency of vanadium reached 97.71 % at a Fe/V molar ratio of 5/2, meanwhile, the precipitation product was further confirmed by XRD, XPS and SEM-EDS. Ultimately, a conceptual flowsheet for recovering completely Mo and V from simulated leaching solutions of spent HDS catalysts was proposed, which provides theoretical guidance for the resource utilization of containing molybdenum and vanadium secondary resources.
研究领域:
环境科学
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冶金工程
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产品关联
DOI
高影响因子
Environmental Technology & Innovation
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2022
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IF 7.758
Yufeng Guo,Jianfa Jing,Feng Chen,Shuai Wang,Lingzhi Yang
There is 3% ∼ 5% tin remaining in the Inner Mongolia tin-bearing middling obtained by flotation, which is a valuable secondary resource of tin. To effectively recover this tin, selective separation tin from tin-bearing middling by sulfide roasting using anhydrous gypsum (CaSO 4 ) as the sulfur agent was proposed in this study. The removal behaviors of tin during sulfur roasting were systematically investigated, including thermodynamic analysis, the effects of anhydrous gypsum, sulfur roasting temperature and time on the tin removal efficiency, and the mechanism model of separation of tin from tin-bearing middling during sulfide roasting. The results indicated that the cassiterite (SnO 2 ) was first transformed to Sn and then transformed to tin sulfide (SnS). Anhydrous gypsum could be recycled by exhausts absorption process in this work, which saved the sulfur agent for the whole separation process. In addition, arsenic was fixated in the residuals, which was beneficial for the separation of tin from tin-bearing middling. The removal efficiency of tin was 91.27% after sulfur roasting with 12.5 wt% CaSO 4 and 17.5 vol.% CO at 950 °C for 1 h.
研究领域:
冶金学
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材料科学
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产品关联
DOI
高影响因子
GREEN CHEMISTRY
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2024
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IF 9.3
Runzhu Gong,Chao Liu,Meiyan Wu,Rui Tian,Guang Yu,Xitao Luo,Bin Li,Feng Peng,Yanjun Tang
Renewable hemicellulose with a unique structure exhibits a wide range of potential applications. However, it has been a formidable challenge to isolate hemicellulose with an intact structure from lignocellulosic materials. In this study, LiBr·3H2O (LBTH) was used as a green solvent for the effective fractionation of hemicellulose from bleached hardwood kraft pulp (BHKP) under mild conditions (25–85 °C). It was found that hemicellulose in BHKP can be dissolved in LBTH with ease and high selectivity owing to the breaking of hydrogen bonds between hemicellulose and cellulose, and the dissolved hemicellulose can be regenerated with a high degree of polymerization (DP) in the range of 240–264 using ethanol precipitation. The highest removal rate of hemicellulose from BHKP was as high as 95.2%, and the corresponding yield of pure hemicellulose reached 84.3%. Moreover, simultaneously obtained undissolved cellulose pulp through LBTH treatment had a high content of α-cellulose (96.7%), high DP (880), and trace levels of Fe (2 ppm), which met the standard requirement for dissolving pulp for the production of lyocell. In addition, LBTH can be easily recycled to guarantee a green and sustainable process. This work provides a new approach for highly selective fractionation of hemicellulose and cellulose from commercial BHKP based on an efficient and environmentally friendly LBTH treatment, which could be very promising for better valorization of hemicellulose and cellulose in many advanced applications.
研究领域:
林业科学
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材料科学
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绿色化学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Sirui Chen,Guoyuan Xiong,Shuangling Cui,Shufang Zhao,Jilong Lai,Xuening Zhang,Guangyong Zeng,Ying Zeng,Hao Shi
The scarcity of rubidium (Rb) in ore form makes it a valuable metal, prompting the need to develop reusable adsorbent materials for effective separation of rubidium (Rb + ) from salt lake brine, which holds significant importance. Herein, a novel Rb + selective composite adsorbent was prepared by in-pore crystallization. Macromesoporous silica was prepared using polyoxyethylene (10) octadecyl ether (Brij S10) as a templating agent and the effect of different templating agents on the pore size was investigated. An AMP-SiO 2 composite adsorbent for Rb + was obtained by “growing” ammonium phosphomolybdate on the macro-mesoporous silica by in-pore crystallization reaction. The results indicated that the adsorption of Rb + by the AMP-SO 2 adsorbent adhered to monolayer chemisorption , which was verified by fitting the adsorption data using the pseudo-second-order kinetics and the Langmuir isotherm model, respectively. The loading of AMP was 29.4 %, which increased the adsorption capacity by 115 %. Furthermore, the adsorption rate of Rb + on AMP-SO 2 when interfering ions were present still reached 73.2 % (KCl), 76.4 % (CaCl 2 ), and 86.6 % (MgCl 2 ). Density functional theory simulation indicated that AMP-SiO2 exhibited a higher adsorption energy for Rb + (−9.79 eV) than K + , Li + , Ca 2+ , and Mg 2+ . The Rb 3d and Mo 3d X-ray photoelectron spectra of AMP-SiO 2 before and after adsorption of Rb + , indicated that the ion-exchange process between rubidium and lattice cations is the controlling mechanism. In addition, AMP-SiO 2 also showed good regeneration performance and maintained a high adsorption rate after five adsorption-resolution experiments. In summary, the AMP-SiO 2 composite adsorbent can effectively expose adsorption sites and improve mass transfer efficiency, and has significant potential for future application in rubidium separation and extraction.
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2012
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IF 4.173
Hang Wang,Lijian Ma,Kecheng Cao,Junxia Geng,Jun Liu,Qiang Song,Xiaodan Yang,Shoujian Li
A new salicylideneimine-functionalized hydrothermal-carbon-based solid-phase extractant was developed for the purpose of separating uranium selectively for sustainability of uranium resources. The resulting adsorption material was obtained via hydrothermal carbonization, calcination at mild temperature (573.15 K), amination, and grafting with salicylaldehyde in sequence. Both Fourier transform infrared spectra and elemental analysis proved the successful grafting of salicylideneimine onto hydrothermal carbon matrix. Adsorption behaviors of the extractant on uranium(VI) were investigated by varying pH values of solution, adsorbent amounts, contact times, initial metal concentrations, temperatures, and ionic strengths. An optimum adsorption capacity of 1.10 mmol g −1 (261 mg g −1 ) for uranium(VI) was obtained at pH 4.3. The present adsorption process obeyed pseudo-second-order model and Langmuir isotherm. Thermodynamic parameters (Δ H = +8.81 kJ mol −1 , Δ S = +110 J K −1 mol −1 , Δ G = −23.0 kJ mol −1 ) indicated the adsorption process was endothermic and spontaneous. Results from batch adsorption test in simulated nuclear industrial effluent, containing Cs + , Sr 2+ , Ba 2+ , Mn 2+ , Co 2+ , Ni 2+ , Zn 2+ , La 3+ , Ce 3+ , Nd 3+ , Sm 3+ , and Gd 3+ , showed the adsorbent could separate uranium(VI) from those competitive ions with high selectivity. The adsorbent might be promising for use in certain key steps in any future sustainable nuclear fuel cycle.
研究领域:
化学工程
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材料科学
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核能技术
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
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2017
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IF 3.091
Zhongqi Ren,Mengyao Wang,Yong Li,Zhiyong Zhou,Fan Zhang,Wei Liu
The designer nature of ionic liquids (ILs) has driven their exploration and application in countless fields because of their unique phiscochemical properties. In this work, two ester-functionalized ionic liquids (ILs), N-ethyl acetate-N-methylimidazole bis(trifluoromethylsulfonyl)imide ([Eamim][NTf2]) and N-ethyl acetate-N-methylimidazole sulfocyanide([Eamim][SCN]), were prepared. Two ternary systems, benzene-hexane-[Eamim][NTf2] and benzene-hexane-[Eamim][SCN], were investigated in terms of both quantum chemical calculation and liquid–liquid extraction experiments. Quantum chemical calculation results showed that the interaction between ILs and benzene was larger than that between ILs with n-hexane. The liquid–liquid extraction results showed that the selectivity reached 29.55 with [Eamim][NTf2], while the selectivity reached 61.44 with [Eamim][SCN] at 25 °C. The vapor permeation process was conducted through a supported membrane with ILs. The influences of operating temperature and the feed concentration of benzene were investigated. With the increase of temperature, the selectivity of benzene increased at first and then decreased. When the concentration of benzene was 0.5 and the temperature was 35 °C, the selectivity of benzene reached 16.05, while the flux was 22.14 g·h–1·m–2. The stability of the membrane in the vapor permeation was also tested and could remain steady for 60 h.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Wenjing Li,Xuelin Dong,Lihua Zhu,Heqing Tang
It is urgently needed to develop highly efficient and selective adsorbents for enrichment and separation of Re(VII) from Mo(VI) to obtain metallic rhenium. By tuning cross-link of chitosan, ionic gel capsules (CSN) were prepared, which had a core-shell structure and wrapped N263 (methyl trioctyl ammonium chloride) as an extractant. After being characterized, the CSN capsules were used as a green adsorbent for separation of ReO 4 − from MoO 4 2− . It was found that the gel yielded good adsorption capacities for Re(VII) in a wide pH range from pH 2 to 12. The adsorption of Re(VII) on the gel followed the Langmuir model, exhibiting a maximum adsorption capacity of 222 mg g −1 for Re. The adsorbent showed good adsorption capacities for Mo(VI) at pH < 2, but little at pH > 3.5. Therefore, the enrichment and separation of Re(VII) from Mo(VI) could be easily achieved by using the gel adsorbent in a wide pH range from 4 to 12, showing a separation factor β Re/Mo with values of 10 3 –5 × 10 4 . A mechanism was proposed for the selective adsorption of Re(VII). The extractant N263 wrapped in the capsule core provides excellent extractive adsorption ability for Re(VII) through ion association extraction, generating ion association complex R 4 N + ∙ReO 4 − in the adsorbent. The gel shell was composed of cross-linked chitosan induced by sodium tripolyphosphate, and functioned as a blocking layer for the adsorption of Mo(VI), being possibly related to a special interaction between Mo and P as observed in the formation of phosphorus molybdenum heteropolyacid and/or the crosslinking with Mo and chitosan. The CSN gel was successfully applied to separate ReO 4 − from a practical alkaline solution.
研究领域:
环境科学
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材料科学
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生物化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL RESEARCH
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2023
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IF 8.3
Ziyue Yang,Shujie Tang,Xiangtao Huo,Mei Zhang,Min Guo
This study used a novel green bifunctional deep eutectic solvent (DES) containing ethylene glycol (EG) and tartaric acid (TA) for the efficient and selective recovery of cathode active materials (LiCoO 2 and Li 3.2 Ni 2.4 Co 1.0 Mn 1.4 O 8.3 ) used in lithium-ion batteries through one-step in-situ separation of Li and Co/Ni/Mn. The effects of leaching parameters on the recovery of Li and Co ( η Li and η Co ) from LiCoO 2 are discussed, and the optimal reaction conditions are verified, for the first time, using a response surface method. The results demonstrate that under optimal conditions (120 °C, 12 h, EG to TA mole ratio (M EG:TA ) of 5:1, and solid to liquid ratio (R S/L ) of 20 g/L), the η Li from LiCoO 2 reached 98.34%, and Co was formed as a purple precipitate of cobalt tartrate (CoC 4 H 4 O 6 ), which was transformed into a black powder of Co 3 O 4 after calcination. Notably, the η Li for DES 5 EG:1 TA was maintained at 80% after five cycles, indicating good cyclic stability. When the as-prepared DES was used to leach the spent active material Li 3.2 Ni 2.4 Co 1.0 Mn 1.4 O 8.3 , the in-situ selective separation of Li ( η Li = 98.86%) from other valuable elements such as Ni, Mn, and Co, was achieved, indicating the good selective leaching capacity and practical application potential of the DES.
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
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Huayi Tan,Bingqiang Fan,Shili Zheng,Hedong Zhang,Yang Zhang
Molybdenum (Mo) and vanadium (V) are both important strategic metals. Due to their similar physicochemical properties, it is always a challenge to realize their deep separation from a solution. However, based on the valence difference of Mo and V, this task can be achieved by the selective complexation precipitation of hexamethylenetetramine (HMT). In this study, through precipitation behavior studies in the single metal species solutions and the mixed species solutions of Mo and V in different chemical valence states, the complexation precipitation separation system of V and Mo was constructed. As a result, in the single metal species solution, the precipitation depths of Mo(V), Mo(VI) and V(V)) reached 96.83% 98.77% and 99% under the best conditions, respectively, while V(IV) remained in the solution. The results of the mixed-species complexation precipitation experiments revealed the most efficient selective separation scheme by HMT. Furthermore, combined with the characterization of the complexation precipitates of HMT with the single species of Mo(V), Mo(VI) and V(V), the mechanisms of the complexation reactions were elucidated. In particular, due to the different ion species of Mo caused by the different valence states, the complexation precipitation mechanisms of Mo(V) were different from those of Mo(VI). Finally, the differences in the mechanisms of Mo(V), Mo(VI) and V(V) complexation were also presented in their kinetics, and the reaction constants and activation energies were calculated by first-order kinetics. This study may provide further insight into the selective complexation separation of Mo and V.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
Desalination and Water Treatment
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2016
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IF 1.272
Li Yang,Yao Chen,Jiangdong Dai,Naichao Si,Yongsheng Yan
Thermosensitive/magnetic molecularly imprinted polymers (TM-MIPs) were prepared by Pickering emulsion polymerization. With this method, SiO2 nanoparticles were used as the Pickering emulsion stabilizer, N-isopropylacrylamide functioned as the thermosensitive monomer participating in co-polymerization, and bifenthrin (BF) acted as the template molecule. The results of the characterizations demonstrated that the TM-MIPs were porous and magnetic inorganic/polymer composite microparticles with magnetic sensitivity (Ms = 0.7921 emu g−1), thermal stability (below 473 K), and magnetic stability (over the pH range of 2.0–8.0). TM-MIPs were used as sorbents to remove bifenthrin (BF), and then were swiftly split in magnetic field. The Freundlich isotherm model preferably matched with the experimental data. The adsorption kinetic of the TM-MIPs was primely fitted by the pseudo-second-order, indicating that the chemical reaction could be the rate-limiting step in the process of BF absorption. The selective recognition experiments exhibited that the TM-MIPs have obvious effect on selective adsorption of BF with diethyl phthalate and fenvalerate. In aqueous solutions, the adsorption of BF onto the TM-MIPs had response to temperature, and could be used for adsorbing and separating bifenthrin.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
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