MINERALS ENGINEERING
·
2018
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IF 2.707
Zhili Li,Feng Rao,Ramiro Escudero García,Hongqiang Li,Shaoxian Song
The sodium oleate collector used in malachite flotation usually exhibits low selectivity. By partially replacing sodium oleate with alcohols, this study presents a method for increasing the selectivity of sodium oleate-based collectors in malachite flotation. By combining 3 × 10 −5 mol/L alcohols, such as 1-octanol, 2-ethylhexanol, and α-terpineol, with 1 × 10 −5 mol/L sodium oleate, malachite floatability values higher than 98% are achieved. Contact angle and zeta potential measurements reveal that the co-adsorption of alcohols with sodium oleate may be resulted from the hydrophobic interactions between their hydrocarbon chains. The co-adsorption of methyl isobutyl carbinol, along with its shorter hydrocarbon chain, makes it more difficult to render the malachite surface highly hydrophobic. However, the co-adsorption of straight-chain and branched-chain alcohols with sodium oleate shows the ability consistently to induce high malachite floatability.
研究领域:
矿物加工工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Ya Gao,Xinzhuang Fu,Zujiang Pan,Tong Yue,Wei Sun
Although the relevant direct and revers flotation mechanism has been discussed a lot in diaspore and kaolinite separation, the quantitative analysis of surface-active sites and their reaction descriptions during flotation have not been reported yet. In this study, the hydration and collector adsorption reactions of anionic sodium oleate (NaOL) and cationic hexadecyl trimethyl ammonium bromide (CTAB) onto diaspore and kaolinite were quantized. Surface complexation model (SCM) was referred to obtain intrinsic reaction equilibrium constants. It can be found that for NaOL adsorption, the equilibrium constant of diaspore (10 13.55 ) was obviously bigger than that of kaolinite (10 11.76 and 10 10.35 for ≡AlOH and ≡SiOH, respectively), corresponding to direct flotation of bauxite. While the interaction (10 3.90 for ≡XNR) between the permanent negatively charged site ≡X − and CTAB was much stronger than other sites. Besides, the single adsorbed amount in mixed minerals were successfully predicted at ratios of 1:2, 1:1 and 2:1. Finally, the fitted potential curves were also acceptable to zeta potential tests. These conclusions from SCM calculation can provide strong supports for collector adsorption differences and then help for separation much more efficiently and economically through saving preliminary exploration cost.
研究领域:
矿物加工工程
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Particuology
·
2021
·
IF 3.067
Zhanglei Zhu,Yafeng Fu,Wanzhong Yin,Haoran Sun,Keqiang Chen,Yuan Tang,Bin Yang
Surface roughness has a significant influence on mineral flotation. The assisting effect of surface roughness on minerals flotation is extensively investigated from its physical properties (e.g., the existing form of asperity and its size), however, the associated effect on mineral flotation based on the differences in surface chemical property caused by surface roughness has been rarely touched. With such a question in mind, in this study, we investigated the flotation recoveries of two batches of magnesite particles with varying degree of surface roughness produced by two different mills, and associated the flotation performances to their surface chemical properties (amount of adsorption sites for the collector) via a series of detections, including Scanning Electron Microscope-Energy Dispersive Spectrometry (SEM-EDS) observations, X-ray photoelectron spectroscopy (XPS) analysis, adsorption capacity tests, and contact angle measurements. Finally, we concluded that rougher magnesite particles could provide more active sites (Mg 2+ ) for a larger capacity of sodium oleate (NaOL), thereby improving the hydrophobicity and floatability.
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
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jiaqiao Yuan,Hongyu Lu,Xiang Gong,Mingjun Chen,Hao Lai,Shuming Wen,Shaojun Bai,Dandan Wu
The development of high-efficiency beneficiation processes for ilmenite has garnered widespread attention. This study proposed the utilize of a heterogeneous Fenton catalytic technology involving H 2 O 2 and Fe 2+ to enhance ilmenite flotation. The flotation results indicated that pre-oxidation of ilmenite with H 2 O 2 -Fe 2+ before adding collector could recover over 80 % of ilmenite from titanaugite. Electron Paramagnetic Resonance and slurry iron component concentration analyses revealed that the •OH generated within the ilmenite-H 2 O 2 -Fe 2+ catalytic system could oxidize Fe 2+ to Fe 3+ . The stronger binding capability of Fe 3+ with NaOL led to a remarkable discrepancy in floatability between ilmenite and titanaugite. Zeta potential analysis further confirmed that the oxidation degree of the ilmenite surface and the adsorption of iron species were higher than those of titanaugite. Additionally, Time-of-Flight Secondary Ion Mass Spectrometry and X-ray photoelectron spectroscopy analyses provided evidence for the selective activation of ilmenite by the H 2 O 2 -Fe 2+ . Furthermore, Density Functional Theory calculations revealed that the stable adsorption of Fe 2+ and Fe(OH) 2 + offered additional active sites on the ilmenite surface for NaOL adsorption. Moreover, the adsorption of •OH significantly affected the electronic spin density of the Fe 3d orbitals of Fe atom in ilmenite, and played a crucial positive in the surface activity of ilmenite.
研究领域:
矿物加工工程
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Mining Science and Technology
·
2024
·
IF 11.7
Lingyun Liu,Chuilei Kong,Hongyu Zhao,Fangqin Lu
This study delves into the intricate relationship between iron (Fe) content in kaolinite and its impact on the adsorption behavior of sodium oleate. The effects of different iron concentrations on adsorption energy, hydrogen bond kinetics and adsorption efficiency were studied through simulation and experimental verification. The results show that the presence of iron in the kaolinite structure significantly improves the adsorption capacity of sodium oleate. Kaolinite samples with high iron content have better adsorption properties, lower adsorption energy levels and shorter and stronger hydrogen bonds than pure kaolinite. The optimal concentration of oleic acid ions for achieving maximum adsorption efficiency was identified as 1.2 mmol/L across different kaolinite samples. At this concentration, the adsorption rates and capacities reach their peak, with Fe-enriched kaolinite samples exhibiting notably higher flotation recovery rates. This optimal concentration represents a balance between sufficient oleic acid ion availability for surface interactions and the prevention of self-aggregation phenomena that could hinder adsorption. This study offers promising avenues for optimizing the flotation process in mineral processing applications.
研究领域:
矿物加工工程
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2024
·
IF 4.9
Xinzhuang Fu,Ya Gao,Chuanxi Peng,Haisheng Han,Wei Sun,Tong Yue
The interaction of surfactants at minerals-water interfaces in flotation system plays an important role in minerals separation. Although the increasing number of reports have been published on the sodium oleate (NaOL) adsorption at the mineral–water interface, there has been little development in describing and predicting its adsorption behaviors from a quantitative molecular insight. In this study, based the adsorption experiments, the adsorption characteristics of NaOL on the hematite/quartz-water interfaces were quantitatively depicted using the surface complexation model (SCM). There was a monodentate binding form between the function group on NaOL and the hematite and quartz surface sites during SCM fitting. The binding constants (logK) of NaOL are 10.72 (≡Fe-OL) and 8.03 (≡Si-OL), respectively. Notably, there are more positive ≡FeOH 2 + site on the hematite surface, and it has strong adsorption capacity with anionic surfactant NaOL. Moreover, the minerals surface potentials, NaOL adsorption capacity and flotation recovery in mixed ore systems were successfully predicted by the model. This study provides a credible evaluation of the adsorption characteristics of NaOL under a broad scope of pH and concentration conditions. Meanwhile, quantitative analysis of surfactants adsorption at minerals-water interfaces is beneficial for the intelligence of mineral processing technology and efficient separation of minerals.
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
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2024
·
IF 1.9
Zhanglei Zhu,Bohui Zhao,Jin Wang,Yiming Zhu,Qiuyue Sheng,Zhen Li,Ningning Zhang,Wei Yu
High-ash fine slime has an adverse effect on coal flotation. In this study, the roles of sodium silicate (SS) and sodium carbonate (SC) in the facilitating effect on lean coal flotation (a type of coking coal) were studied when sodium oleate (NaOL) was used as a collector through flotation tests, Scanning Electron Microscope-Energy Dispersive Spectroscopy (SEM-EDS) observations, turbidity measurements, and particle interaction energy calculations. The flotation tests found that SS has a stronger capacity than SC for the improvement of flotation performance of lean coal. Moreover, SEM-EDS observations and turbidity measurements showed that SS presents a stronger weakening effect for the coating of high-ash fine slime on the surface of low-ash coal particles than SC. Furthermore, the particle interaction energy calculations verified that the increase in the energy barrier for the attachment between low-ash coal particle and high-ash fine slime caused by SS is larger than SC, providing theoretical supports for the experiments. Compared to kerosene as a collector, based on the similar ash content, the yield of clean coal increases greatly with the synergistic effect of SS and NaOL. In summary, SS is an appropriate dispersant for lean coal flotation in sodium oleate system.
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
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Huaxia Li,Wencui Chai,Yijun Cao,Yankun Wu,Shichong Yang
Mixed collectors were widely used in mineral flotation. In this work, D-phenylalanine (D-phe) was first introduced to improve the collectability and selectivity of sodium oleate (NaOL) for diaspore from kaolinite. The flotation performance of diaspore and kaolinite were studied by micro-flotation tests, and the synergistic mechanisms of D-phe with NaOL were investigated through FTIR spectra, zeta potential, solution chemistry and X-ray photoelectron spectroscopy (XPS). Single and mixed flotation results show that D-phe exhibited superior synergism power with the NaOL collector. Under pulp pH 9.0, the flotation recovery of diaspore was increased from 77.13% to 91.07%, while that of kaolinite was decreased from 16.27% to 13.75%. The zeta potential and XPS analysis indicate that the synergistic mechanisms of D-phe with NaOL were mainly the co-adsorption via the carboxylate group of D-phe and NaOL bonding with the Al sites of diaspore surface. D-phe was chelated onto the diaspore surface through the –COO – and –NH 3 + /NH 2 groups, and the pre-adsorption of D-phe could increase the Al active sites of diaspore surface for the direct adsorption of NaOL. NaOL could also indirectly adsorb on the diaspore surface through H-bonding with –NH 2 /NH 3 + groups of D-phe.
研究领域:
矿物学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2020
·
IF 5.065
Long Wang,Weiguang Zhou,Shimin Song,Hanyu Gao,Fusheng Niu,Jinxia Zhang,Guanghua Ai
Iron ions activation of quartz is a tricky issue for efficiently sorting of target minerals in ferrous minerals flotation . The selection of an effective depressant is one of the most significant approaches to addressing this problem. In this study, the effects of calcium lignosulphonate (CLS), a widely studied novel depressant, on the flotation of Fe 3+ -activated quartz were investigated. The potential depression role of CLS in separating hematite from Fe 3+ -activated quartz in a sodium oleate (NaOl) flotation system was further explored. The flotation results indicated that the separation of hematite from quartz could be achieved by the selective depression of quartz in the presence of CLS. The results of zeta potential and spectroscopy analysis showed that CLS could absorb onto the surfaces of both hematite and Fe 3+ -activated quartz. The presence of CLS hindered the further adsorption of NaOl on quartz, whereas the NaOl adsorption onto hematite surfaces was limitedly affected. Compared with hematite, CLS might be more prone to react with the Fe sites on the surface of Fe 3+ -activated quartz, resulting in a relatively high final adsorption density on quartz surfaces, which was confirmed by X-ray photoelectron spectroscopy analysis and adsorption tests.
研究领域:
矿物学
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浮选工艺
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2021
·
IF 5.134
Wencheng Xia,Yuqiang Mao,Guangyuan Xie,Yaoli Peng
The filling of pores by flotation-reagent-contained water plays an important role in porous mineral flotation . This paper studied the role of sodium oleate (NaOL, a commonly used flotation reagent) solution in the in-situ wetting process of pores of porous active carbon using 1 H LF-NMR, FTIR as well as contact angle measurements. The floatability of active carbon particles wetted by NaOL solutions was evaluated by particles-bubble attachment measurements. The pore wetting percentage decreased as the NaOL concentration increased. The variation trend in pore wetting percentage by NaOL solutions was from fast to slow. Increasing the NaOL concentration contributed to achieve a lower pore wetting percentage as well as rate. The NaOL solution with a high concentration significantly improved the hydrophobicity of the sample, which further prevents the pore wetting process.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Xujian Chai,Shangyong Lin,Jihua Zhai,Jianhua Kang,Pan Chen,Runqing Liu
The existing fatty acid collectors generally have problems of poor separation performance and low recovery in the strongly acidic pulp of the flotation of ilmenite concentrate. In this study, a surfactant, dodecyl dimethyl betaine (BS-12), was introduced to promote the flotation performance of sodium oleate (NaOL) under strong acid conditions. Using the combined collector (NaOL:BS-12 = 6:4), 90% of the ilmenite could float while the titanaugite basically did not float under the condition of pulp pH = 3. The interaction mechanism was investigated through laser particle size analysis and high-speed photography. The results of laser particle size analysis showed that the combined collector could selectively flocculate ilmenite and increase the particle size of ilmenite, making it easier to be floated out, but had no similar effect on titanaugite. The results of high-speed photography showed that the combined collector could make the ilmenite particles form huge flocs and the adhesion of the flocs to bubble was the best compared with the cases when NaOL or BS-12 was used individually, while such effect on titanaugite was limited. Therefore, the combined collector (NaOL:BS-12 = 6:4) will be a promising collector for ilmenite flotation because of its excellent selectivity and conformity to the actual situation of industrial production of ilmenite concentrate.
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
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Zhao Chen,Danhua Xie,Binglei Song,Chaowang Li,Xiaomei Pei,Rong Li
A tetrameric monomer containing an azobenzene group (abbreviated as tetra-N(AZO)-Br) was synthesized in this paper, and a “pseudo” oligomeric surfactant was constructed using tetra-N(AZO)-Br and a traditional surfactant, sodium oleate (SO), by non-covalent bonded interaction. The synthesized tetra-N(AZO)-Br was characterized by 1 H NMR and UV–Vis spectra. The viscoelasticity and the difference in nuclear magnetic resonance (NMR) and ultraviolet (UV) absorption of the SO/tetra-N(AZO)-Br “quasi” tetrameric surfactant solution at different concentrations were investigated. The SO/tetra-N(AZO)-Br “pseudo” tetrameric surfactant could form highly viscoelastic worm-like micelles in solution, and the zero-shear viscosity of the system increased with increasing concentration. The viscoelastic properties of SO/tetra-N(AZO)-Br “pseudo” tetrameric surfactant had no obvious change after UV light irradiation . Since the combination of SO and tetra-N(AZO)-Br molecules was in dynamic equilibrium through the attraction of positive and negative charges, as much as 30% of the trans- tetra-N(AZO)-Br molecules in worm-like aggregates were transformed to their cis- structure. The un-transformed trans- tetra-N(AZO)-Br molecule could move in the aggregate and help maintain the structure of the aggregates, so that the viscosity had no obvious change.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）