APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Heng Yu,Wei Sun,Chenyang Zhang,Zechao Huangfu,Fuchao Fan
Due to the limitations of existing flotation technologies, the resource development of talc-containing molybdenum ores remains an urgent issue that must be addressed. The development of effective talc depressants has become a significant research focus. Studies indicate that the combination of sodium carboxymethyl starch (CMS) and magnesium ion (Mg 2+ ) can effectively inhibit talc, achieving high selective flotation of molybdenite. However, the interaction mechanism between CMS and Mg 2+ , as well as its depressing mechanism on the anisotropic surface of talc, remains unclear. To address this issue, this study employed multiple testing methods and combined micro-flotation tests to systematically compare the differences in adsorption and bonding mechanisms between the mixed dosing system and the sequential dosing system on various crystal surfaces of talc and molybdenite, while also exploring their impact on flotation behavior. The research results indicate that in the mixed dosing system, CMS and Mg 2+ interact with the surface of talc through complex formation, which enhances its hydrophilicity. When the concentration of CMS is 1 × 10 -3 mol/L, the average recovery rate of talc decreases to 14.82 %, while the recovery rate of molybdenite reaches 84.85 %, thereby facilitating the selective separation of talc and molybdenite.
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
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Yonggai Li,Jiawei Li,Peng Chen,Jianzhong Chen,Lijuan Shen,Xiangnan Zhu,Gan Cheng
In this study, X-ray Photoelectron Spectroscopy (XPS) was used to analyze the elements on the surface of subbituminous coal , and reverse flotation was introduced to float subbituminous coal. The effect of ultra-fine coal on the flotation behavior of silica in coal reverse flotation was discussed by comparing the flotation performance with two different artificial mixed flotation feedings, with ultra-fine coal (UFC, −45 μm) or without ultra-fine coal. The comparison results showed that the existence of UFC reduced the flotation rate and the recovery of silica, as well as the separation efficiency of subbituminous coal reverse flotation. Compared to the flotation performance of feeding with UFC, the concentrate ash content of feeding without UFC was lower (9.18%), and the separation efficiency was higher (68.69%). Total Organic Carbon Analyzer was used to test the adsorption quantity of collector by coal and silica to explain the mechanism. Conclusions were obtained that ultra-fine coal particles could adsorb more collector due to their larger specific surface area, leading to less collector left in the pulp to float silica particles. Selective flocculation reverse flotation method could increase the separation efficiency of coal reverse flotation with appropriate dosage flocculant .
研究领域:
矿物加工工程
·
煤炭科学与技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Zhihao Shen,Shuming Wen,Yongchao Miao,Han Wang,Qicheng Feng
Unavoidable metal ions commonly exist in the pulp during flotation. These ions can affect the floatability of minerals, and they can also result in the differences in the surface features between different minerals. In this study, how Fe 3+ affected the flotation behavior of cerussite was investigated by micro-flotation tests. The corresponding adsorption characteristics of the sulfidizing agent and collector on the surfaces of cerussite were investigated by surface-analysis techniques. The results of micro-flotation tests showed that the floatability of cerussite significantly decreased when Fe 3+ was added before Na 2 S and xanthate. The flotation recovery of cerussite decreased compared with that obtained without participation of Fe 3+ . Additionally, the results of xanthate and Na 2 S adsorption tests, X-ray photoelectron spectroscopy (XPS), time-of-flight secondary ion mass spectrometry (ToF-SIMS) and zeta potential measurements verified that Fe 3+ and its hydrophilic hydroxyl derivatives (Fe-OH compounds) resulted in reduced amounts and reactive activities of S-bearing species adsorbed on the surfaces of cerussite. This decreased the adsorption capacity of subsequently added xanthate, resulting in the difficulty in effectively recovering cerussite in the sulfidization-xanthate system.
研究领域:
矿物加工工程
·
表面化学
✓ 已验证
DOI
高影响因子
ADSORPTION SCIENCE & TECHNOLOGY
·
2021
·
IF 4.232
Bo Yang,Xian Xie,Xiong Tong,Lingyun Huang
Terpenic oil (TO) is commonly used as a flotation frother for the selective separation of sulfide minerals. As a frother, most reports have mainly focused on its effect on froth stability and froth entrainment, whereas its influence on the floatability of sulfide minerals has received little attention. In this work, the influence of TO on the flotation behavior of sphalerite was investigated by using microflotation tests, contact angle and zeta potential measurements, and FT-IR and SEM-EDS analyses. Microflotation tests conducted in a modified Hallimond tube indicated that compared with the collector potassium butyl xanthate (KBX), the flotation recovery of sphalerite was significantly increased when TO was added to the pulp, but the recovery of Cu-activated sphalerite with the addition of TO was lower than that with the addition of KBX. Contact angle measurements demonstrated that the contact angle of sphalerite was distinctly increased by the addition of TO, but the contact angle of sphalerite treated with TO was lower than that treated with KBX after Cu activation. Zeta potential measurements demonstrated that the zeta potential of sphalerite particles was slightly decreased when treated with TO, and the isoelectric point (IEP) was decreased from 3.3 to 3.1 due to the interaction of TO with sphalerite particles. FT-IR and SEM-EDS confirmed that TO could be adsorbed on the sphalerite surface on the formation of the oil film due to its low solubility, thereby increasing the surface hydrophobicity of the sphalerite. In addition, the TO absorbed on the surface acts as a bridging role and promotes the hydrophobic agglomeration of sphalerite particles. These results suggest that except for froth entrainment, the influence of TO on the flotation behavior of sphalerite may be another reason for the misreporting of sphalerite in concentrates.
研究领域:
矿物加工工程
·
材料科学与工程
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Shangyong Lin,Chengwen Wang,Runqing Liu,Wei Sun,Gaogui Jing
Researchers in most of the published works paid a great attention in the effects of pH on the flotation behavior of minerals, where most of which ignored the influences of pH on the surface properties. Herein, the detailed surface analyses of several typical sulfide minerals, namely, molybdenite, bismuthinite, and pyrite, were conducted to identify the effect of pH on the mineral surface property. As observed, all these minerals exhibited excellent hydrophobicity under highly acid conditions. The surface chemical composition of molybdenite and bismuthinite remained relatively steady as pH increased, but the decrease in surface hydrophobicity of bismuthinite was more serious than that of molybdenite under the alkaline conditions. Pyrite was more affected by the pH value. At pH below 4.0, FeS 2 was the dominate species at pyrite surface. With the increase in alkalinity , the pyrite was gradually oxidized and the surface became hydrophilic. As the pH further increased to12.0, the hydrophobicity of pyrite almost vanished due to the deposition of hydrophilic oxidation products (e.g., Fe 2 (SO 4 ) 3 , Fe(OH) 3 , and FeOOH) on its surface. The differences in the surface characteristics of molybdenite, bismuthinite, and pyrite at different pH values can be used to design the flotation process for separation of these sulfide minerals.
研究领域:
矿物学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Xinzhuang Fu,Ya Gao,Haisheng Han,Zhiyong Gao,Li Wang,Wei Sun,Tong Yue
The deep integration of modern information technology and mineral processing, the establishment and application of a database, and fast, efficient and accurate selection of beneficiation technology and flotation reagent system, which is a development trend of modern mineral processing. In this study, the flotation system with hematite, quartz and dodecylamine (DDA) as collector was used as an example to quantify the types and densities of active sites on the surfaces of hematite and quartz, as well as the reaction equilibrium constants of their hydration reactions and the adsorption equilibrium constants of DDA. Protonation and adsorption experiments were simulated using the Surface complexation model (SCM) with single site ( ≡SiOH or ≡FeOH ) and monodentate surface complexation. The protonation and adsorption reaction equations were established based on the material and charge equilibrium under experimental conditions, and the equilibrium constants of the surface reactions were obtained by numerical optimization. Results of surface complexation model indicate that the adsorption ability of DDA on the quartz surface is stronger than that of hematite. DDA adsorption can be successfully predicted using SCM in pH and different mineral ratios system. Overall, this work reveals the quantitative expression of the mineral inherent characteristic and the affinity with reagents, forming a model for predicting the adsorption capacity of the reagent and providing an optimal solution for flotation.
研究领域:
矿物加工工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Mining Science and Technology
·
2021
·
IF 4.084
Jinpeng Cai,Peilun Shen,Dianwen Liu,Xiaolin Zhang,Jianjun Fang,Chao Su,Xingcai Yu,Jiangli Li,Han Wang
In this work, the growth of copper sulfide crystal onto azurite surfaces during sulfurization and its response to flotation are investigated. Filed emission scanning electron microscopy-energy dispersive X-ray spectroscopy (FESEM) and X-ray diffraction (XRD) studies confirmed that the sulfurization of azurite is not limited to the mineral surface, but rather penetrates into the bulk to form covellite crystal (syn-CuS), creating favorable conditions for the stable adsorption of xanthate and greatly promoting the azurite flotation. Additionally, as demonstrated by X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (TOF-SIMS) analyses, a redox reaction occurred during this process, and Cu(Ⅱ) onto the mineral surface was reduced to Cu(I). Correspondingly, reduced S 2- was oxidized to (S 2 ) 2- , (S n ) 2- , and even to deeper oxidation state S 0 , (S x O y ) n- and SO 4 2- . Excess sodium sulfide strengthens copper sulfide to form onto the azurite surface, and provides enough raw material for crystal copper sulfide to grow, resulting in the formation of “flake-like” covellite with a better crystallinity. However, the floatability of azurite decreased dramatically under this condition, because the generated massive colloidal copper sulfide in flotation pulp deteriorates the flotation environment, resulting in a decreased effective adsorption of collector onto azurite surfaces.
研究领域:
矿物学
·
浮选化学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2018
·
IF 2.707
Zhili Li,Feng Rao,Mario A. Corona-Arroyo,Arnoldo Bedolla-Jacuinde,Shaoxian Song
In this research, malachite particles with different roughness values were produced by grinding malachite sample together with quartz (mohs hardness: 7) and montmorillonite (mohs hardness: 1–2), respectively. Micro-flotation results showed that higher recovery was achieved by using malachite particles of higher surface roughness as feed. The contact angle measurements demonstrated that the contact angle of natural malachite surface decreased with the increase of its surface roughness, while the contact angle of malachite conditioned with 5 × 10 −5 mol/L sodium oleate increased with the increase of its surface roughness. It might be concluded that grinding media can influence minerals surface roughness, thus affecting the wettability of their surface and, consequently, the flotation performance.
研究领域:
矿物加工工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2020
·
IF 5.578
Liang Shen,Chuanzhen Wang,Fanfei Min,Lingyun Liu,Changguo Xue
Low rank coal contains a large number of pores and cracks which have an adverse influence on its flotation behavior. Effects of pores on the hydration layer and flotation behavior of low-rank coal were studied by molecular dynamics method and experiments in this paper. A specific surface area/pore analyzer was employed to determine the pore structure. Pore distribution analysis indicated that the pores in the low-rank coal are mainly micropores. Pore volume and average pore diameter in low-rank coal can be reduced by pore compression pretreatment. Coal-bubble attachment experiments were conducted to study the effect of pores on the effect of pores on particle bubble adhesion process. Results showed that coal particles with less pores were more likely to adhere to the surface of the bubble. And a probable mechanism for the effect of pores on the adhesion of coal particles to bubbles was proposed. Molecular dynamics simulation results revealed that the pores on the surface of low-rank coal reduce the mobility of water molecules and form a more stable hydration layer. Flotation results indicated that reducing the pore content in low-rank coal could reduce the collector dosage in flotation process and improve the flotation behavior of low-rank coal.
研究领域:
矿业工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2020
·
IF 4.142
Xuesong Jiang,Jian Chen,Mengnan Wei,Feifei Li,Boyuan Ban,Jingwei Li
The purity of quartz particles obtained by crushing the same quartz is different. Poly (propylene glycol) bis (2-aminopropyl ether) (PEA) was used to separate quartz sand particles of different purity by flotation . Through flotation experiments combined with XRD , ICP , FT-IR, and XPS , the collection performance and adsorption principle were studied. Froth flotation results demonstrate that particles with higher purity can be more readily floated. Batch flotation results indicate that the first froth product (F1) has the highest purity and its removal rates of Al, K and Na reached 84.6%, 80.7% and 84.1%. The total impurity content (Al, K, Na) of F1 (448 ppmw), F2 (579 ppmw) and F3 (972 ppmw) is lower than the Feed (2717.4 ppmw) and their mass proportion is greater than 25%. XPS analyses confirm that the impurities are mainly enriched on the fracture surface. Consequently, the crushing-classification mechanism and the PEA adsorption model have been proposed.
研究领域:
矿物加工工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2022
·
IF 5.479
Binbin Li,Qing Shi,Dezhi Liu,Saizhen Jin,Qingyun Luo,Zejun Wang
Recent studies on calcite have shown that newly precipitated clusters of amorphous calcium carbonate (ACC) and vaterite in pulp change the inherent reactivity of the calcite surface. The flotation recovery and surface zeta potential of calcite undergo rapid changes during the initial reaction time but are slightly altered after 60 min. In order to further understand the adverse effects of newly precipitated CaCO 3 on the flotation of calcite, the relationship between the recrystallization process of nascent calcium carbonate (CaCO 3 ) and the flotation behavior of calcite was explored under different time conditions in this study. Accordingly, during the recrystallization process, the intensity of the chemical reaction between ACC–vaterite–calcite and hexametaphosphate (SH) was found to gradually weaken through the flotation test, SEM, XRD and FTIR . Furthermore, due to the difference in crystal structure, ACC and vaterite were shown to strengthen the reactivity of SH and Ca 2+ on the surface of calcite in flotation through the zeta potential test and X–ray photoelectron spectroscopy (XPS), thereby weakening the ability of oleate (OL − ) in collecting the mineral.
研究领域:
矿物学
·
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Li Yu,Xinyang Xu,Zhitao Yuan,Yuankai Xu
Froth flotation, the main process for separating ilmenite, depends heavily on the performance of flotation reagents. Herein octyl hydroxamic acid (OHA) and lead nitrate served as collector and activator were introduced into the ilmenite-titanaugite flotation system. The adsorption of Pb 2+ on ilmenite and titanaugite surfaces and the subsequent influence on their flotation behaviors were systematically investigated by AFM, FTIR and XPS. Microflotation results showed that Pb 2+ could selectively enhance the floatability of ilmenite rather than titanaugite. Contact angle and AFM measurements verified that OHA selectively adsorbed onto the surface of Pb 2+ -modified ilmenite and increased its hydrophobicity. As characterized by zeta-potential and XPS analyses, lead ions adsorbed onto ilmenite surfaces via chemisorption and physisorption, forming lead-containing complexes, while only Pb 2+ physisorption occurred on titanaugite surfaces. Consequently, the active sites on ilmenite surfaces were dramatically increased and leading to the denser adsorption of OHA collector which contributed to the flotation of ilmenite.
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
危险品化学品经营许可证（带存储）