APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Zhoujie Wang,Houqin Wu,Jie Yang,Zhen Tang,Liping Luo,Kaiqian Shu,Yanbo Xu,Longhua Xu
The inability of rare earth and gangue minerals to be efficiently separated by flotation due to their similar physicochemical properties is a major challenge of the rare earth industry. Bastnaesite is one of the principal sources of light rare earth elements. The use of traditional flotation reagents often poses the problem of poisonous wastewater generation. Therefore, we use xanthan gum (XG) as a non-toxic, biodegradable, and cheap depressant to selectively separate bastnaesite from calcite by flotation and probe the corresponding mechanism. Microflotation experiments/zeta potential measurements conducted with/without XG using sodium oleate as a collector demonstrate that at pH 8, XG decreases the flotation recoveries of calcite and bastnaesite by 85.09 and 22.37%, respectively. Further analysis of adsorption behaviour on the mineral surface and possible reagent-mineral interactions shows that selective mineral separation is due to the preferential interaction of XG with Ca ions on the calcite surface and the suppression of oleate ion adsorption thereon due to the steric hindrance of polymeric XG. Hence with regard to the potential of XG in calcium-bearing mineral separation, XG could be as a new depressant for RE mineral flotation.
研究领域:
矿物学
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环境科学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4194
·
IF 4.2
Kaiwei Ding,Tingsheng Qiu,Xianhui Qiu,Guanfei Zhao,Qinghao Jiao,Jiangjie Fang,Ruisen Lai,Wenhui Yang
The floatability of fluorite and calcite exhibit similar properties, rendering their flotation separation challenging. Macromolecular polysaccharide reagents containing the polyhydroxyl group have shown broad promising application. The selectivity of polysaccharide is relatively low. In this study, the introduction of Fe3+was employed to enhance the selective adsorption capacity of Pullulan polysaccharide towards fluorite and calcite minerals, thereby achieving effective flotation separation. Furthermore, the mechanism underlying intramolecular interactions was elucidated. The DFT calculation and XPS analysis revealed that the adsorption of Fe3+on the calcite surface was more favorable, leading to the formation of a Ca-O-Fe structure. The MD simulation, XPS analysis, and Zeta potential analysis revealed that the Fe-OH groups on the surface of calcite reacted with the -OH groups in Pullulan and formed bonds, resulting in the formation of a Calcite-Fe-Pullulan structure. This facilitated the attachment of a significant number of Pullulan molecules to the calcite surface. The formation of a hydrophilic layer on the outer surface of calcite by Pullulan, in contrast to the absence of such layer on fluorite’s surface, results in an increased disparity in surface floatability between these two minerals, thereby enhancing the efficiency of flotation separation.
研究领域:
矿物学
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表面化学
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分子动力学模拟
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
·
2021
·
IF 6.064
Yuxi Lu,Shuai Wang,Hong Zhong
Wolframite is often associated with calcium bearing minerals, leading to low grade, while conventional anionic collectors are hard to realize their efficient flotation separation, thus the effective structural modification of cationic collectors provides a new insight into enhancing the comprehensive development of wolframite resources. In this study, a surfactant 3-dodecyloxy propyl amidoxime (DOPA) was designed and first used as the collector in flotation separation of wolframite from fluorite and calcite. Computational calculations basically proved the correctness of predictions about the performances of DOPA. Micro-flotation tests indicated that compared to DDA and conventional anionic collector benzohydroxamic acid (BHA), DOPA possessed superior collecting ability to wolframite and excellent selectivity against fluorite and calcite at low concentration, with no frother or activator employed, which is supposed to be an efficient collector for separating wolframite from calcium bearing minerals. The separation mechanisms of DOPA between wolframite and fluorite/calcite were further probed, revealing that besides the electrostatic attraction between DOPA and wolframite, DOPA could chemisorb onto wolframite surfaces by forming five-membered ring toward the surface cation site Fe or Mn, with no significant interaction observed on fluorite/calcite surfaces, resulting to the excellent separation performance.
研究领域:
矿物加工工程
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材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Xun Wang,Jie Liu,Yimin Zhu,Yanjun Li
Cassiterite is the most purist tin-containing mineral and plays a dominative role in the tin resources. Owing to the limited selectivity of conventional collectors, the efficient separation of cassiterite from fluorite is normally difficult. Herein, 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTCA) was employed as an eco-friendly depressant to selectively depress the flotation of fluorite. The flotation experiments were conducted to evaluate the separation efficiency of the two minerals, and the results showed that cassiterite and fluorite could be efficiently separated at the flotation reagent scheme of 15 mg/L PBTCA and 20 mg/L NaOL when pH was 8.04. Furthermore, a series of detection and simulation technologies including wettability analysis, zeta potential measurement, FTIR analysis, XPS analysis and DFT calculation were performed to uncover the underlying adsorption and depression mechanism of PBTCA on cassiterite and fluorite. These further analyses indicated that PBTCA could be chemisorbed on the fluorite surface through the interaction between the phosphate group in PBTCA and the calcium sites in fluorite. Moreover, the adsorption of PBTCA on fluorite surface would intensively inhibit the adsorption of NaOL. However, PBTCA was only weakly adsorbed on the cassiterite surface and could not affect the interaction between NaOL and cassiterite. Finally, a most likely adsorption model of PBTCA onto fluorite surface with the “mono-polar group” interaction was proposed by DFT calculations.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Silicon
·
2019
·Vol. 12
·期 2
·327-338
·
IF 1.21
Wei Mengnan,Ban Boyuan,Li Jingwei,Sun Jifei,Li Feifei,Jiang Xuesong,Chen Jian
A novel green cationic surfactant Poly (propylene glycol) bis (2-aminopropyl ether) (PEA) with multiple amine groups was utilized as a collector for flotation separation of quartz from feldspar-quartz associated ore (FQA) without acid (particularly, HF) and alkali. The collecting performances and the adsorption mechanisms of PEA on the quartz/FQA were investigated through flotation experiments, ICP-OES, XRD, Zeta potential, FTIR and XPS measurements. A remarkable separation of the quartz from FQA has been realized in an environmental friendly way. The froth flotation results show that the flotation recovery of quartz is 97.79% and that of FQA is 19.30% at pH 9.00–9.50 with 10 −4 M PEA when the particle size ranges from 150 to 270 μm. The results of batch flotation, ICP-OES and XRD analyses show that the first flotation product is almost quartz, while more feldspar and little quartz exist in the sink product when compared with the FQA feed. The mechanism of PEA acting as the collector for the separation of quartz/feldspar has been investigated. The PEA is adsorbed on the quartz surface by electrostatic and hydrogen bonding interaction with ─NH 3 + /─NH 2 head groups, while is less adsorbed on the feldspar surface due to electrostatic repulsion between the K + / Na + ions and the positively charged ─NH 3 + /─NH 2 head groups of PEA. A conceptual adsorption model of the PEA cationic collector on the quartz and the FQA surfaces has been proposed.
研究领域:
矿物加工工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Jie Liu,Xun Wang,Yimin Zhu,Yuexin Han
The selective separation of scheelite from fluorite is difficult because of their similar surface properties. In this study, diethylenetriaminepentaacetic acid (DTPA) was used as a novel depressant for the efficient removal of fluorite from scheelite, and its depression effect and mechanism were systematically investigated by conducting micro-flotation experiments and a series of surface analyses. The micro-flotation experiments showed that the floatability of fluorite was significantly reduced by DTPA, whereas that of scheelite was minimally affected. Zeta potential measurements revealed that DTPA selectively adsorbed on fluorite surface and decreased the zeta potentials, whereas the zeta potentials of scheelite were negligibly influenced by DTPA. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy further proved that the interaction between DTPA and the fluorite surface was chemisorption, and in the adsorption configuration, the carboxyl groups of DTPA chelated with Ca sites on the fluorite surface. Additionally, an electrical analysis showed that electrostatic attraction facilitated the adsorption of DTPA on the fluorite surface. The adsorption of DTPA on fluorite surface could strongly inhibit the further adsorption of NaOL on fluorite surface, and therefore significantly depressed the floatability of fluorite. In contrast, the interaction between DTPA and scheelite was very weak and was impeded by steric hindrance caused by WO 4 2- and electrostatic repulsion. Therefore, DTPA has the potential to act as a depressant for the effective separation of scheelite from fluorite.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Jian Peng,Wei Sun,Haisheng Han,Leming Ou,Jianhua Chen,Yuanjia Luo
Herein, a new and environmentally friendly process scheme containing PGA as depressant and Z200 as collector for chalcopyrite-molybdenite bulk flotation and STG as depressant for chalcopyrite/molybdenite separation flotation was applied to the separation of pyritic Cu-Mo sulfide ore from Daye, Hubei Province, China. The flotation results showed that the new process scheme not only can efficiently achieve the flotation separation of chalcopyrite and molybdenite, but also can reduce the dosage of STG in chalcopyrite/molybdenite separation compared with the traditional process combining CaO and BX. The closed-circuit flotation experiment results further demonstrated this preferable result. Besides, the differences in the adsorption of STG on the chalcopyrite (112) surface in the presence of Z200 and BX were investigated by first-principles calculations at the atomic level. The calculation results showed that the STG adsorption on chalcopyrite (112) surface in the presence of Z200 was easier than that in the presence of BX, and the STG adsorption weakened the Z200 adsorption on chalcopyrite (112) surface, which provides atomic-scale explanations to the less STG dosage in chalcopyrite/molybdenite separation. This new reagent scheme has environmental advantages and great reference value for the separation of other pyritic copper-molybdenum sulfide ores.
研究领域:
矿物学
·
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Mineral Processing and Extractive Metallurgy Review
·
2020
·
IF 2.785
Zhiyong Gao,Jian Deng,Wei Sun,Jianjun Wang,Yunfeng Liu,Fengping Xu,Qinghong Wang
Scheelite and calcite are usually intergrown calcium minerals that are separated via froth flotation. However, their selective separation remains difficult because of their similar surface properties. 2-phosphonobutane −1, 2, 4-tricarboxylic acid (PBTCA or H5L) is widely used in water treatment due to its low phosphorus content and efficient anti-scaling performance. With its excellent calcium-chelating ability, PBTCA was used as a novel depressant to selectively separate scheelite from calcite in this study. The flotation results of single mineral, binary mixed minerals, and real ore showed that PBTCA could selectively depress calcite at pH 9.0 using sodium oleate as collector. The results of zeta potential measurements, solution chemistry calculation, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and density functional theory calculation indicated that the dominant form of PBTCA was L5-. This anion had a stronger adsorption on negatively charged calcite surfaces through electrostatic interaction. Higher Ca density and stronger Ca activity on calcite promote the adsorption of L5-. Moreover, the active O atoms in L5- could better match with two Ca sites on calcite in the interatom distance. Thus, PBTCA provides a new option for calcite depressants and has great industrial application potential.
研究领域:
矿物加工工程
·
表面化学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yanfei Chen,Xueyi Guo,Yuanlin Chen
In the present study, sesbania gum (SG) was introduced as a depressant to achieve the selective flotation separation of smithsonite from calcite , and the deep adsorption mechanism was systematically examined using a variety of methods, including density functional theory (DFT) calculation and a series of advanced analytical manners. Micro-flotation experiments indicated that SG strongly depressed the flotation of calcite at pH 9.5, while having little impact on the flotation of smithsonite, leading to the successful separation of the two minerals. DFT calculation predicted that SG could be adsorbed onto the calcite surface, but not onto the hydroxylated smithsonite surface in an aqueous solution system. This was supported by zeta potential tests, Fourier-transform infrared spectroscopy (FTIR) tests, and time-of-flight secondary ion mass spectrometry (TOF-SIMS) detection. As a result, the adsorption of sodium oleate (NaOL) onto the calcite surface was hindered by the pre-adsorption of SG, while the adsorption of NaOL onto the smithsonite surface was not affected. X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM) tests confirmed that SG was mainly adsorbed onto the calcite surface via physical adsorption . This finding provided a new perspective for the interaction between mineral and hydroxyl containing depressant.
研究领域:
矿物加工工程
·
表面化学
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2019
·
IF 5.107
Guichen Gong,Pan Wang,Jie Liu,Yuexin Han,Yimin Zhu
The effect and mechanism of Cu(II) on the flotation separation of cassiterite from fluorite using styrene phosphonic acid (SPA) as a collector were investigated by flotation tests, zeta potential measurements, X-ray photoelectron spectroscopy (XPS) analysis and density function theory (DFT) calculations. SPA showed good collecting ability for both cassiterite and fluorite, and Cu(II) could intensively and selectively depress fluorite. At pH 4.0, using 100 mg/L SPA as the collector and 5 × 10 −4 mol/L Cu(II) as the inhibitor, a tin concentrate with a grade of 92.3% SnO 2 and a recovery of 85.6% was obtained for an artificially mixed sample which contained 47.86% SnO 2 . Zeta potential and XPS analyses indicated that Cu(II) was anchored on cassiterite surface but not on fluorite surface, and Cu(II) hindered the adsorption of SPA on fluorite but had negligible influence on the adsorption of SPA cassiterite. DFT calculations confirmed that the affinity between Cu(II) and SPA is much stronger than that between Cu(II) and fluorite surface, and the adsorption of SPA on cassiterite surface was not weakened by the presence of Cu(II). Consequently, it was inferred that Cu(II) consumed the collector SPA in the pulp, and the flotation of cassiterite was unaffected but fluorite was depressed by Cu(II). Therefore, Cu(II) is an effective inhibitor for the flotation separation of cassiterite from fluorite.
研究领域:
矿物加工工程
·
表面化学
·
计算化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Xinyan Suo,Bowen Yu,Jinting Sha,Runbo Gao,Mengyao Qi,Yehao Huang,Weijun Peng,Xiao Guo,Wei Wang,Yijun Cao,Chongqing Wang,Yukun Huang
Amine ether was initially used as a novel collector for the direct flotation of quartz to separate the quartz from feldspar under weak alkaline conditions. The flotation results demonstrated that the recovery differences between quartz and feldspar both decreased with the increase in the carbon chain length and number of alkoxy groups of amine ether. A recovery difference of nearly 90 % could be achieved between them at a pulp pH of 8.0 with dodecylamine polyoxyethylene ether (AC1210) serving as the collector. The results of the mechanism analysis demonstrated that AC1210 was effectively adsorbed on the quartz surface via electrostatic interaction and hydrogen bonding. However, the electrostatic repulsion between the K + on the feldspar surface and positively charged NH + groups of AC1210 weakened the adsorption of AC1210 on the surface of feldspar. The difference in the adsorption capacity of AC1210 between the quartz and feldspar promoted the selective direct flotation of quartz from the mixture of quartz and feldspar.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Jiajun Liu,Guofan Zhang,Binbin Li,Xinya Fu,Sen Li
In this study, we aimed to address the problem of fine-grained serpentine forming “slime coating” on the surface of pyrite, which deteriorates the flotation of pyrite, by systematically investigating the effects of HPMA on the separation of pyrite and serpentine, as well as the underlying mechanism. The flotation results indicated that the recovery of pyrite deteriorated by serpentine was significantly increased and reached 90 % by adding 30 mg/L of HPMA at pH 9.00. The total organic carbon (TOC) test and zeta potential test results revealed that the adsorption of HPMA on serpentine was much stronger than that on pyrite. The adsorption behavior was confirmed by X-ray photoelectron spectroscopy (XPS) analyses, which demonstrated that HPMA could chelate with positively charged Mg ions on the surface of serpentine, resulting in a significant change in the surface charge of serpentine to a negative state. The positive effect of HPMA on pyrite flotation was visualized by a scanning electron microscope-energy dispersive spectroscopy (SEM-EDS) analyzer and characterized by the major elemental content. As a result of the addition of HPMA, the surface charge of serpentine was changed from positive to negative, which resulted in the disruption of co-cohesion between serpentine and pyrite. This result enhanced the natural floatability of pyrite and the adsorption of collector potassium amyl xanthate (PAX) on pyrite, thus achieving the selective flotation between pyrite and serpentine.
研究领域:
矿物加工工程
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）