COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
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IF 5.4
Shuo Liu,Fangxu Li
In order to overcome the limitations of fatty amines (FAS) and reduce consumption and costs, this study developed a high-efficiency flotation system that FAS with methyl isobutyl methanol (MIBC). Single mineral flotation results showed that MIBC enhanced the collecting ability of decamine (DCA), dodecylamine (DDA), tetradecylamine (TDA), and hexadecylamine (HCA) while reducing their dosage. At pH 3, recoveries for DCA, DDA, TDA, and HCA were 63.22 ± 1.34 %, 86.284 ± 4.33 %, 72.30 ± 3.34 %, and 40.02 ± 2.27 %, respectively. With MIBC added, these increased to 89.43 ± 1.87 %, 89.58 ± 2.66 %, 73.38 ± 4.27 %, and 79.60 ± 2.23 %. Batch flotation experiments also demonstrated that lepidolite recovery by DDA and HCA rose from 96.64 % and 36.47–96.70 % and 98.29 %, respectively. Surface tension and viscosity detection revealed that the addition of MIBC to FAS resulted in a decrease in surface tension and an increase in solution viscosity. The adsorption, zeta potential, contact angle and foaming property tests indicated that MIBC can enhanced the recovery of lepidolite by adjusting the adsorption densities of DCA and DDA, as well as modifying the bubble properties of TDA and HDA in the flotation pulp. These findings highlighted the critical role of bubble properties in lepidolite flotation systems, going beyond mere hydrophobicity effects.
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
ACS Sustainable Chemistry & Engineering
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2020
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IF 7.632
Zhiqiang Huang,Shiyong Zhang,Chen Cheng,Hongling Wang,Rukuan Liu,Yajing Hu,Guichun He,Xinyang Yu,Weng Fu
On January 25, 2019, the tailings dam at Vale’s Córrego do Feijao mine (Brumadinho, Minas Gerais, Brazil) ruptured, releasing about 12 million cubic meters of tailings, killing over 240 people and posing a considerable and ongoing environmental hazard. Thus, the recovery of valuable minerals from tailings can contribute to a sustainable disposal of this hazardous residue, saving human lives and protecting the environment. The tailings of a tantalum–niobium mine usually contain a considerable amount of lepidolite resource. Nonetheless, the method of sustainably acquiring the lepidolite resource from tailings of a tantalum–niobium mine at low-temperature environments has always been needed. In this study, we synthesize a new amine-based gemini surfactant, butanediyl-α,ω-bis(dimethyldodecylammonium bromide) (BDB). It is introduced as a collector in the flotation of lepidolite from the tantalum–niobium mine tailings for the first time at low temperatures. We compare its capability to collect lepidolite with the monomeric surfactant 1-dodecylamine (DA). In bench-scale flotation experiments, the Li2O recovery of lepidolite concentrate with 80 g/t BDB was 10.96% and 31.85% higher than that with 160 g/t DA at 298 and 275 K, respectively, which indicated that BDB is a better collector for lepidolite than DA. BDB is a novel and superior collector for disposing of lepidolite tailings ponds.
研究领域:
矿物加工工程
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环境科学
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材料化学
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产品关联
DOI
高影响因子
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH
·
2024
·Vol. 47
·期 1
·1-18
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IF 3.2
Gong Huichun,Ke Pingchao,Zhou Yipeng,Xu Lingling,He Guang,Jian Peng
Fluoride contamination is a serious environmental problem in lepidolite hydrometallurgy wastewater. The treatment of fluoride-bearing wastewater is challenging because of the presence of coexisting ions including lithium (Li + ), rubidium (Rb + ), silicate (SiO 3 2− ), sulfate radical (SO 4 2− ). However, aluminum-modified zeolite (Al@zeolite) with sufficient hydroxyl groups and high adaptability has unique advantages for eliminating fluoride from lepidolite hydrometallurgy wastewater. Al@zeolite was prepared on natural zeolite by an atmospheric process and then used for the adsorption of fluorine from fluoride-bearing wastewater produced by the lepidolite hydrometallurgy process. The results of material characterization confirmed the successful immobilization of aluminum within the zeolite pores and indicated the formation of zeolite-Al–OH. The zeolite host significantly enhanced the chemical stability of Al@zeolite against pH changes for a wide pH range of 2.0–10.0. The adsorbent had a surface area of 33.46 m 2 /g and demonstrated excellent capacity and selectivity for fluoride adsorption. Notably, a maximum adsorption of 98.6% was observed at a pH value of 6.0 for a duration of 20 min with a fluoride content of 20 mg/L, and the equilibrium concentration decreased to 0.4 mg/L. The results of fluorine adsorption showed that fluoride uptake onto Al@zeolite agreed well with the pseudo-second-order kinetic model and the Langmuir isotherm model. The reusability of the substance was evaluated for up to eight cycles following consecutive regeneration with 0.2 mol/L AlCl 3 . The exhausted Al@zeolite was effectively regenerated through simple alkaline treatment for recycling. The above results verified that Al@zeolite is a new kind of efficient defluoridation adsorbent for lepidolite hydrometallurgy wastewater with practical application prospects.
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
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2017
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IF 2.843
Jing Huang,Yaxin Qiu,Defeng Wu,Jun Wang
A new approach to improve the thermal stability and mechanical strength of thermoplastic polyester elastomer (TPEE) using spodumene slag as the filler is reported here. The thermal decomposition temperature of TPEE increases from 277 °C to about 350 °C by about 26% in the presence of pristine spodumene slag. The surface graft reaction further improves its barrier effect. Besides, spodumene slag can be used as a good reinforcement to TPEE, and also the surface treatment favors further improvement of its reinforcing effect. However, the presence of spodumene slag reduces the elastoplasticity and viscoplasticity of the system, leading to decreased tensile cycles and elongation levels. The morphological and crystallographic methods were then employed to further reveal the alteration of the phase separation structure of TPEE in the presence of spodumene slag, aiming at establishing structure–property relations of composites. This work can provide useful information on the preparation of new TPEE composites with tailorable properties.
研究领域:
材料科学
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复合材料
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产品关联
DOI
高影响因子
International Journal of Mining Science and Technology
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2024
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IF 11.7
Zhonghua Xue,Yali Feng,Haoran Li,Jinrong Ju,Xingquan Du
In order to alleviate the pressure on the supply of lithium resources, this research proposes the use of binary/ternary collectors with high selectivity and collecting ability to enhance the flotation purification of low-grade zinnwaldite ore. The binary collector is a mixture of dodecylamine polyoxyethylene ether and DL-2-octanol. A binary collector is added first, followed by sodium oleate, known as a ternary collector. Under acidic conditions, the recovery of Li 2 O in the concentrate was increased by 8.26% with the binary collector and 13.70% with the ternary collector, compared to the dodecylamine polyoxyethylene ether. The binary collector enhanced the dispersibility of the single collector, while co-adsorption strengthened the hydrophobic nature of the zinnwaldite surface. Consequently, zinnwaldite particles, after the application of binary collector, displayed inter-particle flocculation and attachment to bubbles within 60×10 −9 m compared to other particles. Ternary collector exhibited the capacity to lower critical micelle concentration and surface tension, subsequently inducing a denser and thicker hydrophobic layer through electrostatic forces, hydrophobic interactions, and chemical reactions. The objective of this research is to facilitate the recovery of lithium resources from low-grade ores in order to meet the needs of sustainable development.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2021
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IF 4.765
Xu Wang,Haisheng Hu,Meitang Liu,Yunfei Li,Yong Tang,Lun Zhuang,Benjun Tian
In this work, the comprehensive utilization of spodumene waste residue - lithium slag is achieved. An experimental scheme of hydrothermal preparation of nano-kaolinite and xonotlite from it is proposed. The W-lithium slag is completely decomposed into sodalite and then transformed into hydroxycancrinite in 6 mol/kg NaOH solution at 220 ℃. As an intermediate product, hydroxycancrinite was reacted with 0.65 mol/kg HNO 3 solution at 260 ℃ for 24 h to prepare nano-kaolinite successfully. The desiliconization filtrate produced by the reaction of W-lithium slag and NaOH solution was used as raw material, mixed with CaO and reacted at 260 ℃ for 12 h after aging for 12 h, then xonotlite was successfully prepared. This work demonstrates great potential on green recycling of spodumene waste residue from lithium extraction process and introduce a new economical processing technique for the slag as well.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Zheyi Zhang,Fen Jiao,Qian Wei,Guoyan Liang,Wenqing Qin
Lepidolite deposits contain abundant fine-grained minerals formed during mineralization, weathering, and milling processes, making the flotation process susceptible to the influence of gangue slime, particularly feldspar. In this study, the effects of the novel Anti-Slime Collector DDA (Dodecylamine)/HQ330 and the mixed collector DDA/NaOl (sodium oleate) on lepidolite flotation in the presence of feldspar slime were compared. The results demonstrated that DDA/HQ330 effectively alleviated the negative impact of feldspar slime on lepidolite flotation. The mechanism was investigated using Scanning Electron Microscopy, three-phase contact line tests, Atomic Force Microscopy tests, adsorption amount tests, zeta potential tests, and surface tension tests. The results suggested that feldspar slime influenced lepidolite flotation by consuming reagents. There was a higher amount of adsorption on the lepidolite surface when using DDA/HQ330 compared to DDA/NaOL. DDA/HQ330 readily adsorbed on the feldspar slime surface and had minimal impact on the zeta potential of the feldspar. Additionally, DDA/HQ330 displayed lower surface tension, leading to the formation of more stable bubbles, which could potentially enhance flotation performance.
研究领域:
矿物加工工程
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材料科学与工程
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产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2023
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IF 5.2
Zheyi Zhang,Qian Wei,Fen Jiao,Wenqing Qin
Nanobubbles (NBs) have recently been used for fine particle flotation , and mixed cationic/anionic collectors have shown powerful effects in flotation of lepidolite. In this paper, the flotation tests, nano particle size analyses, contact angle tests, settling tests and high-speed camera observation was used to study the interaction between NBs and fine lepidolite particles with mixed cationic/anionic collectors. The results showed that the concentration of surface NBs and the presence of bulk NBs play an indispensable role in the promotion of lepidolite flotation by NBs. The size of NBs was larger near the isoelectric point and NBs were more stable by co-interaction with the mixed cationic/anionic collectors. The mechanism of the influence of NBs on the surface hydrophobicity of lepidolite was proposed, and the unstable effect of NBs on the flotation of fine-grained lepidolite was explained.
研究领域:
矿物加工工程
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化学工程
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
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IF 4.4
Xingang Wang,Jian Fu,Fubing Zou,Hongyun Luo,Jiukai Cai,Yong Yu
According to the chemical composition and structure properties of lepidolite lithium slag (i.e., LS), reinforcing materials were prepared to improve the mechanical properties and flame retardancy of poly(vinyl alcohol) (PVA)/montmorillonite (MMT) aerogels. Specifically, calcium sulfate anhydrous whiskers (CSAW) were synthesized from LS rich in CaO and SO3 (i.e., LS-B), and nanofillers were obtained from LS rich in Al2O3 and SiO2 (i.e., LS-A). A densified columnar-honeycomb structure of composite aerogels was obtained by adding the above CSAW and nano LS-A. The results show that the mechanical properties were improved remarkably, and the peaks of heat release rate, smoke production rate, and total smoke production were decreased significantly with the combined addition of CSAW and nano LS-A. The strength was increased by about 160%, and the modules were increased by about 130%. The fire safety was also promoted significantly, i.e., the peak of heat release rate was 128.37 kW·m–2, and the smoke production rate was cut down about 3.0 times. The enhancing mechanism of the combined effect from CSAW and nano LS-A on mechanical properties and flame retardancy should be due to the columnar-honeycomb structure formed by CSAW and PVA/MMT and the filling effect of nano LS-A. The proportion of LS utilized in the composite aerogels was achieved by more than 40%. The composite aerogel can be potentially applied in flame retardant fields. This study is of great significance for the high value and comprehensive utilization of LS. It also provides an idea for improving the mechanical properties and flame retardancy of PVA/MMT aerogels in the future.
研究领域:
材料科学
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环境科学
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化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）