Minerals
·
2020
·Vol. 10
·期 3
·282
·
IF 2.38
Wenliang Xiong,Jie Deng,Kaile Zhao,Weiqing Wang,Yanhong Wang,Dezhou Wei
The flotation of bastnaesite, as a major mineral source of rare earth elements, attracting much attention in the mineral processing field, is challenging owing to the natural flotability of calcium-bearing minerals. To promote the application of flotation, we systematically investigated the flotation behavior of bastnaesite, barite, and calcite, with salicylhydroxamic acid (SHA) as the collector through micro-flotation experiments, zeta-potential measurements, Fourier transform infrared (FT-IR) analyses, X-ray photoelectron spectroscopy (XPS) analyses, and solution chemistry analyses. Micro-flotation experiments confirm that the flotability of bastnaesite is high at pH 6.5–8.5, while calcite floats at pH 8.0–9.5, and barite has little flotation response. The results of FT-IR, XPS, and zeta-potential measurements indicate that there is chemical adsorption of SHA on the bastnaesite surface, and physical adsorption also occurs. However, as for barite and calcite, there is only physical adsorption of SHA on the surfaces. The solution chemistry results show that SHA anions can interact with RE3+, REOH2+, and RE(OH)2+on bastnaesite surfaces in aqueous suspensions, resulting in bastnaesite flotation.Keywords:bastnaesite;barite;calcite;salicylhydroxamic acid;flotation
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2025
·
IF 7.2
Yanxu Wang,Siyuan Yang,Qianqian Wang,Bo Chen,Shenxu Bao,Wenbo Li,Cheng Liu
The efficient flotation separation of rare earth elements (REEs) from gangue minerals is crucial in mineral processing. This study synthesized a quaternary ammonium salt ionic liquid collector, tetrabutylammonium salicylhydroxamate (T-S), and investigated its performance in separating bastnaesite and fluorite. T-S was synthesized from salicylhydroxamic acid (SHA) and tetrabutylammonium chloride (TBAC), and its molecular structure was characterized using Fourier transform infrared (FTIR) spectroscopy. Microflotation tests indicate that T-S outperforms SHA and TBAC in both collecting ability and selectivity for bastnaesite. Adsorption, zeta potential, and infrared spectroscopy measurements reveal that T-S exhibits stronger adsorption on bastnaesite compared to SHA and TBAC. X-ray photoelectron spectroscopy (XPS) and molecular dynamics simulations (MDS) results confirm that chemical adsorption occurs between Ce on the bastnaesite surface and the –C(=O)NHOH groups of T-S. Moreover, the interaction between T-S and the bastnaesite surface is stronger than that with the fluorite surface. This work provides valuable insights for designing ionic liquid collectors for the flotation separation of bastnaesite and fluorite.
研究领域:
矿物加工工程
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2024
·Vol. 14
·期 9
·870
·
IF 2.2
Jieliang Wang,Wenda Lu,Zhao Cao,Xu Wu,Peng Wang,Xiaoping Wang,Wenli Liu
The surface properties of bastnaesite and parisite are similar to their associated gangue mineral, fluorite, which makes the flotation separation of these two rare earth minerals from fluorite one of the industry’s most significant challenges. This study systematically investigates the inhibitory effects and mechanisms of sodium silicate (SS) on bastnaesite, parisite, and fluorite in an octyl hydroxamic acid (OHA) collector system through flotation experiments, various modern analytical methods, and DFT simulations. The flotation test results indicate that the inhibition effects of SS on the three minerals are in the order: fluorite > parisite > bastnaesite. Detection and analysis results indicate that SS forms hydrophilic complexes with Ca atoms on the surfaces of fluorite and parisite, enhancing surface hydrophilicity and inhibiting OHA adsorption, but its impact on bastnaesite is relatively minor. DFT simulation results show that OHA forms covalent bonds with metal ions on mineral surfaces, favoring five-membered hydroxamic-(O-O)-Ce/Ca complexes, and reacts more strongly with Ce atoms than Ca atoms. SS primarily forms covalent bonds with metal atoms on mineral surfaces via the SiO(OH)3−component, and OHA and SS compete for adsorption on the mineral surfaces. OHA has a stronger affinity for bastnaesite, whereas SS shows the highest affinity for fluorite, followed by parisite, and the weakest affinity for bastnaesite.
研究领域:
矿物加工工程
·
计算化学
✓ 已验证
产品关联
DOI
高影响因子
Mineral Processing and Extractive Metallurgy Review
·
2023
·
IF 5
Xu Wu,Yiwen Hu,Sultan Ahmed Khoso,Zhao Cao
The large loss of fine-grained bastnaesite has become an increasingly important issue restricting the development of rare earth ore flotation industry. To solve this issue, a new collector mixture that combines octyl hydroxamic acid (OHA) and octyl phenol ethoxylation (OP10, the number of ethylene oxide groups is 10) is proposed to be used to improve the flotation of bastnaesite. The flotation adsorption mechanism of OHA/OP10 on bastnaesite was investigated by a series of experimental and analytical tests. The results showed that when the molar ratio of OHA/OP10 was 3:1, the OHA/OP10 combination significantly improved the recovery of −74 + 38 μm and −15 μm bastnaesite compared with only OHA. Optical microscopy revealed that mixed OHA/OP10 had a beneficial effect on fine-grained bastnaesite aggregation. In addition, the results of the zeta potential test, fluorescence spectrum analysis, and XPS analysis showed that OHA and OP10 were co-adsorbed on the surface of bastnaesite.
研究领域:
矿物加工工程
·
化学工程与技术
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Peng Liu,Zhihao Guo,Weidi Zhang,Mengjie Tian,Wei Sun
Bastnaesite has always been faced significant challenges in its flotation separation from its associated gangue minerals like fluorite. Despite being a commonly employed collector for oxide mineral flotations, octyl hydroxamic acid (OHA) still exhibits insufficient selectivity. Consequently, a novel hydroxamic acid, N -[6-(hydroxyamino)-6-oxohexyl]octanamide (NHOO), is synthesized and employed as a collector in bastnaesite flotation, building upon the structure of OHA. Flotation experiments under neutral conditions demonstrate the effective ability of NHOO to achieve a difference of nearly 60% in the recoveries between bastnaesite and fluorite during their separation. Concordant outcomes from zeta potential characterizations, adsorption tests, and X-ray photoemission spectroscopy validate heightened adsorption quantities of NHOO on bastnaesite surface relative to fluorite under identical dosage conditions. Ab initio calculations unveil the capability of NHOO to establish a pentacoordinate chelate ring on bastnaesite surface, whereas on fluorite, it can only form a singular chemical bond. Consequently, NHOO shows a considerably lower energy associated with its adsorption on bastnaesite surface in comparison to its energy on fluorite surface.
研究领域:
矿物加工工程
·
物理化学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Jieliang Wang,Xianbo Fang,Zhao Cao,Wenqiang Zhu,Jianguo Cui,Qizheng Qin,Peng Wang,Aiqing Wang,Burdonov Alexander Evgenievich
In this study, ultrasonic treatment was introduced to improve the activation of octyl hydroxamic acid (OHA) as a collector, enhancing the flotation of bastnaesite. The mechanism of OHA activation by ultrasonic treatment and its role in strengthening adsorption of octyl hydroxamic acid on bastnaesite surface were investigated via flotation experiments combined with solution chemistry calculations, conductivity tests, bubble-particle wrap angle (BPWA), atomic force microscopy (AFM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS), X-ray photoelectron spectroscopy (XPS), and molecular dynamics simulations (MDS). Solution chemistry calculations and conductivity measurements indicated that ultrasonic treatment enhanced the dissociation of OHA molecules significantly, generating more active OHA − anions and thereby improving OHA activation. The increased BPWA confirm enhanced the adhesion of bastnaesite to bubbles following OHA adsorption. AFM and SEM-EDS analysis showed that the adsorption amount of OHA on the surface of bastnaesite increased after ultrasonic treatment. XPS analysis demonstrated that the chemical adsorption of ultrasonic-treated OHA on the bastnaesite surface is enhanced, which improves the hydrophobicity and flotation performance of bastnaesite. This also confirmed that ultrasonic-treated OHA produced more active OHA − anions. MD simulations indicated that as the proportion of OHA − increased, the adsorption and spreading ability of OHA collector clusters on the bastnaesite surface were enhanced, repelling water molecules from the bastnaesite surface. Consequently, the hydrophobicity of the bastnaesite surface increased, further strengthening its flotation performance.
研究领域:
矿物加工工程
·
表面化学
·
浮选化学
·
计算材料科学
·
资源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Weiwei Wang,Zhengyao Li,Mingxing Chen,Zuchao Pan,Zhenyu Wang,Zhenyuan Zhou,Chang Zhang,Jiming Zhang,Weiyao Zhu
This study systematically investigates the crystal properties of bastnaesite and the adsorption mechanisms of salicylhydroxamic acid (SHA) and 2-hydroxy-3-naphthyl hydroxamic acid (2-H-3-NHA) onto the bastnaesite (100) surface using density functional theory (DFT) calculations. Computational results indicate that bastnaesite cleavage primarily occurs along Ce–O and Ce–F ionic bonds during dissociation, with the {100} plane identified as the most preferential cleavage direction due to its lowest surface energy. The chemical reactivity and adsorption behaviors of both collectors were thoroughly examined with adsorption energy calculations quantifying their surface affinity. Comparative analysis reveals that 2-H-3-NHA demonstrates significantly greater adsorption stability and chemical reactivity than SHA. This enhanced performance is attributed to the naphthalene ring’s superior steric hindrance effect and the presence of longer carbon chains compared to the benzene ring in SHA. These findings are consistent with results from the pure mineral flotation tests. Collectively, this work provides an atomic-level understanding of hydroxamic acid collector interactions with bastnaesite surfaces, offering valuable guidance for designing high-performance rare earth mineral flotation reagents.
研究领域:
矿物加工工程
·
计算材料学
·
表面科学
·
资源与环境科学
·
冶金物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）