JOURNAL OF MOLECULAR LIQUIDS
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2025
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IF 5.2
Na Xue,Yunpeng Zhang,Zongxu Li,Yangge Zhu,Xuejing Liu,Hao Wang,Yimiao Nie,Long Wang
Fluorite commonly coexists with calcite, whilst the separation of these two minerals is a longstanding challenge due to their closely similar surface properties. In this work, froth flotation was adopted to remove calcite from fluorite with tara gum (TG) innovatively performed as the calcite depressant. Flotation experiment results showed that TG exhibited strong depression performance for calcite in a broad pH range (6–8) in sodium oleate (NaOL) system. Zeta potential results confirmed that TG trended to selectively react on the calcite and prevented the function of NaOL onto calcite surface. X-ray photoelectron spectroscopy (XPS) measurement found that TG chemisorbed onto calcite, while physically adsorbed on the fluorite. Atomic force microscopy (AFM) tests indicated that TG densely adhered onto calcite surface and greatly enhanced its hydrophilicity, whereas it adsorbed weakly on the fluorite surface. Molecular dynamics (MD) simulations further concluded that TG could abundantly adhere to the calcite surface with higher intensity and capacity. Therefore, TG exhibited effective depression impact on calcite and achieved the separation of fluorite from calcite successfully.
研究领域:
矿物加工工程
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表面化学
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浮选化学
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计算材料科学
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胶体与界面科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2025
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IF 5
Na Xue,Yunpeng Zhang,Zongxu Li,Yangge Zhu,Xuejing Liu,Hao Wang,Yimiao Nie,Long Wang
Fluorite often coexists with calcite naturally and the efficient separation of these two minerals has been a long-troubled problem. In this study, the inhibitory action of 3-phosphopropionic acid (3-PPA) in the flotation separation of fluorite from calcite was investigated and its depression mechanism was detailly explored. In single mineral flotation experiments, when the dosage of sodium oleate (NaOL) was 60 mg/L and the dosage of 3-PPA was 90 mg/L at a pH of 7.5, the recovery rates of fluorite and calcite were 92.52 % and 20.51 %, respectively. At this point, in the concentrate obtained from the mixed ore flotation test, the grade and recovery rate of CaF 2 were 76.24 % and 77.78 %, respectively, demonstrating a selective inhibitory effect on calcite. Zeta potential results confirmed that 3-PPA selectively interacted with calcite, impeding the subsequent adsorption of NaOL. Adsorption capacity tests, Fourier transform infrared spectroscopy (FTIR) and atomic force microscope (AFM) tests showed that 3-PPA powerfully and abundantly adsorbed on the calcite through its phosphate and carboxyl groups, while physically adsorbed on the fluorite surface with relatively small adsorption amount. Molecular dynamics (MD) simulations revealed that 3-PPA aggregated on the calcite surface and formed strong chemical and hydrogen bonding interactions with the calcite (1 0 4) surface through its phosphate groups. In contrast, on the (1 1 1) surface of fluorite, 3-PPA was dispersed and the interaction was weak. Therefore, 3-PPA exhibited a selective inhibitory effect on calcite, enabling the separation of fluorite and calcite.
研究领域:
矿物加工
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表面化学
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浮选化学
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材料科学
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分析化学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4194
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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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
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IF 4.539
Yuangan Chen,Bo Feng,Huashan Yan,Liangzhu Zhang,Chunhui Zhong,Tao Wang,Huihui Wang,Longhua Xu
In this work, dextrin , an effective and eco-friendly organic compound, was used to separate fluorite from calcite . The depression performance and adsorption mechanism of it on the calcite surface were investigated by flotation experiments, contact angle measurements, Fourier transform infrared spectroscopy (FTIR) measurements, and X-ray photoelectron spectroscopy (XPS) analyses. The results showed that fluorite can be selectively separated from calcite with 10 mg/L dextrin and 2 × 10 −5 mol/L sodium laurylsulfonate (SLS). Additionally, the contact angle, FTIR and adsorption measurements indicated that the –OH group of dextrin might be adsorbed on Ca sites on the surface of calcite through chemical bonds. The inner electron binding energy of Ca 2+ in fluorite is larger than the inner electron binding energy of Ca 2+ in calcite, which makes it more difficult to form chemical bonds. Therefore, the chemical adsorption of dextrin on the surface of calcite is stronger than that on the surface of fluorite. Both SLS and dextrin can be adsorbed on the surface of calcite. However, dextrin is a strong hydrophilic compound, the hydrophilicity caused by dextrin is stronger than the hydrophobicity caused by SLS, so dextrin can selectively depress calcite.
研究领域:
矿物加工工程
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环境科学
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产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2022
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IF 5.479
Shuyi Shuai,Zhiqiang Huang,Vladimir E. Burov,Vladimir Z. Poilov,Fangxu Li,Hongling Wang,Rukuan Liu,Shiyong Zhang,Chen Cheng,Wenyuan Li,Xinyang Yu,Guichun He,Weng Fu
This study concentrated on the adsorption features and mechanism of a novel amidoxime surfactant 3-dodecylamine propyl amidoxime (DPA) used as a new wolframite collector on wolframite and calcite surfaces. The flotation experiment showed that DPA collector has a remarkable flotation separation effect on wolframite and calcite. Additionally, the results of the contact angle and zeta potential measurements, and FTIR spectral analysis revealed that the DPA had produced strong electrostatic adsorption on the surface of wolframite, but almost no adsorption on calcite. The results of the DFT calculation showed that DPA had a strong effect on the wolframite surface mainly through the positive charged –C(NOH)N + H 3 group. It provides a new idea for the flotation separation of wolframite and calcite.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
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2026
·
IF 6.6
Jianjun Sun,Liuyang Dong,Peilun Shen,Dianwen Liu
Multi-scale analyses reveal SG’s selective adsorption on mineral surfaces. • The SG–Na 2 CO 3 system enables selective cassiterite separation from calcite. • SG coordinates with Ca 2+ sites, greatly increasing calcite surface hydrophilicity. • MD shows SG strongly increases calcite hydrophilicity, but cassiterite changes little. Cassiterite and calcite commonly occur in close association and exhibit similar flotation behavior, making their selective separation particularly challenging. Therefore, developing a highly selective calcite depressant is critical for improving tin recovery. In this study, a composite depressant system consisting of sodium gluconate (SG)–Na 2 CO 3 was developed for the selective flotation separation of cassiterite from calcite. Flotation tests on artificial mineral mixtures showed that, using SG alone, the concentrate Sn grade and recovery were 48.25% and 75.72%, respectively. With Na 2 CO 3 addition, these values increased to 67.78% and 89.90%, respectively, while the CaO grade and recovery decreased by 10.8 and 28.89 percentage points. To clarify the mechanism, contact angle, Zeta potential, XPS, reaction heat, ToF–SIMS, and MD simulations were conducted. The results indicated that SG selectively coordinated with surface Ca active sites on calcite via carboxylate groups, thereby increasing surface hydrophilicity and inhibiting OHA adsorption. Na 2 CO 3 mainly complexed dissolved Ca 2+ released by calcite dissolution, reducing the nonproductive consumption of SG and promoting its interaction with calcite surface sites. MD simulations further confirmed that SG markedly increased the hydrophilicity of calcite, while having limited effect on cassiterite. Overall, this study provides an effective strategy for the selective flotation separation of cassiterite from calcite. Download: Download high-res image (208KB) Download: Download full-size image
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2023
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IF 8.6
Jie Zheng,Anruo Luo,Yan Jin,Baicheng Feng,Jianhua Chen,Xingrong Zhang
In this study, 5-nonyl salicylaldoxime (5-NSA) was synthesized and used as a malachite collector. Its flotation performances and adsorption mechanism were systematically investigated by micro-flotation experiments, contact angle measurements, SEM-EDS, FT-IR, XPS and DFTB+ simulations. The micro-flotation test results showed that 5-NSA produced high recovery of malachite at pH 9.0–10.0, while showing lower collecting power to calcite or quartz. The contact angle analysis results indicated that the hydrophobicity of malachite surface was promoted after the adsorption of 5-NSA. SEM confirmed the adsorption of 5-NSA on malachite surface. FT-IR and XPS analysis results confirmed that O and N atoms in the oxime group were immobilized on malachite surface with Cu through O Cu O and N Cu O bonding. Their adsorption performances on malachite surface were simulated by DFTB+ method, including 5-NSA, tert -butylsalicylaldehyde oxime (TBSA) and salicylaldoxime agents, which analyzed the bond lengths of their covalent bond formation with Cu and speculated their adsorption properties. In general, according to the experimental test and simulation results, 5-NSA showed a stronger power to malachite than TBSA and salicylaldoxime, and only a small dosage can produce a high malachite recovery. The findings of this research will be helpful to improve the comprehensive utilization efficiency of malachite and promote the metallurgy of copper oxide ores.
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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DOI
高影响因子
MINERALS ENGINEERING
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2022
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IF 5.479
Hongyu Sun,Shuai Wang,Lingyun Fei,Zhanfang Cao,Hong Zhong,Xin Ma
Rhodochrosite is often associated with calcium- and silicon-bearing minerals, resulting in a low grade, and it is difficult to achieve efficient flotation separation with conventional collectors. A novel collector, 2-decanoylamino-pentanedioic acid (DPA), was synthesized by constructing an amide group and double-branched carboxylic acid molecular structure to selectively separate rhodochrosite against quartz and calcite . The flotation results demonstrated that, compared with sodium oleate, DPA exhibited superior collecting performance and enabled the separation of rhodochrosite from quartz and calcite under neutral pH, with no addition of a foaming agent or activator; thus, DPA is regarded as an appropriate flotation collector for rhodochrosite. Analysis of the contact angles, Fourier transform infrared spectroscopy (FTIR), zeta potential and X-ray photoelectron spectroscopy (XPS) results showed that DPA chemically adsorbed on the surface of rhodochrosite, forming 8-membered ring or two 4-membered ring structures. However, no significant interaction was detected on the surface of quartz and calcite, providing evidence for the flotation separation of rhodochrosite from calcite and quartz. This research provides a potential collector for efficient utilization of rhodochrosite.
研究领域:
矿物加工工程
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化学工程
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2019
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IF 3.131
Jianhua Kang,Sultan Ahmed Khoso,Yuehua Hu,Wei Sun,Zhiyong Gao,Runqing Liu
A selective organic depressant was investigated to promote the separation of scheelite from calcite and fluorite . 1-Hydroxyethylidene-1, 1-diphosphonicacid (HEDP) could efficiently reduce the recoveries of calcite and fluorite to less than 20%, while that of scheelite remained above 85%. The selective interaction mechanism was demonstrated via Zeta potential and X-ray photoelectron spectroscopy (XPS) analyses. The conceivable adsorption models of reagents on mineral surfaces were constructed to explain their adsorption mechanism. HEDP exhibited an excellent ability to selectively depress calcite and fluorite attributed to the intense adsorption on their surfaces, whereas its adsorption on scheelite surface was feeble. The technology feasibility of using HEDP to improve the scheelite flotation performance was verified through laboratory and industrial tests. The roughing grade was dramatically improved from 1.22% to 1.68%, and the product grade was enhanced from 24.66% to 28.26% with a noteworthy improvement of cleaning recovery by 6.93%, which would produce a considerable economic benefit.
研究领域:
矿物加工工程
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表面化学
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产品关联
DOI
高影响因子
WATER RESEARCH
·
2022
·
IF 13.4
Fuwei Sun,Tianhu Chen,Ziyang Chu,Peixun Zhai,Haibo Liu,Qiang Wang,Xuehua Zou,Dong Chen
A system of Cu 2+ /calcite/PDS was constructed to degrade sulfadiazine (SDZ). Different from the traditional Cu-mediated activation, a low concentration of Cu 2+ that met drinking water standards (≤ 1 mg/L) transformed into Cu(Ⅱ) solid in the presence of calcite, and then enhanced the degradation of SDZ via PDS activation over a pH range from 3 to 9. According to scavenger and chemical probe experiments, Cu(Ⅲ), rather than radicals (hydroxyl radicals and sulfate radicals) and singlet oxygen, was the predominant reactive species, which was responsible for the degradation of SDZ. Based on the results of XRD, ATR-FTIR, and CV curves et al., CuCO 3 was the main complex with high reactivity for PDS activation to form Cu(Ⅲ). Moreover, detailed degradation pathways of sulfadiazine were proposed according to the UPLC-ESI-MS/MS and their toxicity was predicted by ECOSAR. Besides, the real water matrix would not seriously affect the degradation of SDZ in the Cu 2+ /calcite/PDS system. In summary, this study reveals a new insight into the synergistic effect of Cu 2+ and calcite on the SDZ degradation, and promotes an understanding of the environmental benefits of natural calcite.
研究领域:
环境科学
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化学工程
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分析化学
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水处理
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产品关联
DOI
PubMed
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Cheng Liu,Lei Zhu,Weng Fu,Ruan Chi,Hongqiang Li,Siyuan Yang
Flotation separation of apatite from calcite is difficult due to their same activate calcium atoms on the surface. To address this issue, amino trimethylene phosphonic acid (ATMP) was introduced to separate apatite and calcite in this research. The microflotation results showed that NaOl had an excellent collecting ability to apatite and calcite. Meanwhile, the tests also found that ATMP had a strong depression ability to calcite, but it hardly influenced the apatite floatability. The artificial mixed minerals flotation results confirmed that ATMP could be used as a depressant to separate apatite and calcite in the presence of NaOl. Zeta potential measurements illustrated that the addition of ATMP prevented the NaOl adsorption onto the calcite surface, while it hardly affected the interaction of NaOl with the apatite surface. Solution chemistry calculation of ATMP was conducted to reveal the main species of ATMP, while XPS analysis further indicated the strong chemisorption of ATMP onto calcite rather than apatite. Hence, the selective depression ability of ATMP was attributed to the electrostatic repulsion and steric resistance for the apatite surface and the stable adsorption structure at the calcite surface.
研究领域:
矿物加工工程
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表面化学
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环境科学
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Zhendong Liu,Longguan Zhu,Bingjian Zhang
The surface weathering of open-air limestone caused by long-term acid-rain erosion and thermal stress is an urgent issue to solve. In this study, seven concentrations of diammonium phosphate and aluminum chloride hexahydrate (fixed molar ratio of 1000:1) were used to generate aluminum phosphate protective materials in situ with high lattice matching with calcite for surface consolidation. The compatibility test, mechanical property evaluation, and protective mechanism of the material were elucidated by color change, porosity, permeability, surface hardness, infinite compressive strength, Fourier-transform infrared spectroscopy, and scanning electron microscopy–energy-dispersive X-ray spectroscopy. It was found that aluminum phosphate had good aesthetic compatibility and water–vapor exchange balance with the matrix and surrounding environment. Meanwhile, the surface coating grown by crystal accumulation could play a role in filling pores and agglomerated particles, thereby improving the hardness (83.5 HD), infinite compressive strength (4.05 MPa), and acid-rain erosion resistance of the limestone weathering layer. Aluminum phosphate can play a vital role in the treatment and prevention of limestone surface-weathering diseases and has high research value and broad application prospects.
研究领域:
材料科学
·
文物保护
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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）