MINERALS ENGINEERING
·
2018
·
IF 2.707
Bo Feng,Jinxiu Peng,Wenpu Zhang,Xianghan Ning,Yutao Guo,Wencai Zhang
In the flotation separation of chalcopyrite and talc, depressants are usually added to selectively prevent talc from floating. Commonly used depressants lack selectivity, resulting in the depression of both talc and sulfide minerals. To solve this problem, the role of locust bean gum in the flotation separation of chalcopyrite and talc was studied and its mechanism of talc depression discussed. Single mineral flotation test results showed that both chalcopyrite and talc were floatable in the tested pH range of 3–11 and that locust bean gum depressed the flotation of both minerals; however, locust bean gum showed a strong depressing effect on talc in the pH range of 5–9 at a dosage of 2000 g/t. The results of flotation tests performed on mixed minerals indicated that the use of locust bean gum as a depressant can achieve flotation separation of chalcopyrite from talc. A concentrate of 30.1% Cu was achieved at 88.1% recovery from a feed material containing 15.2% Cu. This was attributed to greater adsorption of locust bean gum on the surface of talc compared with that on the chalcopyrite. Zeta potential and X-ray photoelectron spectroscopy measurements showed that the locust bean gum adsorbed on talc mainly through physical interactions; hydrophobic interactions were considered the main driving force and hydrogen bonds also played a role.
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
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Hao Yi,Yunliang Zhao,Yiping Liu,Wei Wang,Shaoxian Song,Cheng Liu,Hongqiang Li,Weiquan Zhan,Xin Liu
Silica tetrahedron (also called siloxane) is an important structure of clay minerals, the percentage of which influences the hydrophobicity , polarity and other surface properties on clay mineral surfaces. In this study, a novel method for surface wettability modification of talc through thermal treatment has been put forward. In this method, the symmetrical siloxane structures on talc basal surfaces were broken by transforming the nonpolar siloxane structure into a polar structure during the thermal treatment process, thus to decrease the hydrophobic components on talc surfaces, and therefore achieve the goal of surface wettability modification. This study was performed through the measurements of thermosgravimetric analysis and differential scanning calorimetry (TG-DSC), contact angle and wetting heat measurements, fourier transform infrared spectroscopy (FTIR), and 29 Si-nuclear magnetic resonance spectroscopy ( 29 Si NMR) as well as molecular dynamic simulations (MDs). The results indicate that the thermal treatment at 960 °C for only a very short time could greatly decrease the contact angle of water on talc surfaces. The mechanism could be attributed to that the thermal treatment leads to the disorder of some of the Si O bond length and O-Si-O bond angle in talc silica tetrahedron structure, which finally results in the disorder of the symmetrical siloxane structure and the formation of the amorphous silica phase. And the decrease of hydrophobic siloxane structures on talc surface gives rise to the relatively strong hydrophilicity on talc surfaces. This current method improves the wettability of talc without any addition of modifiers, which would be helpful of many applications of clay minerals, such as clay-polymer composites, filler materials , clay mineral dispersion in aqueous suspensions or mineral processing , etc.
研究领域:
矿物学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 21
·6474
·
IF 3.623
Huan Shuai,Jiao Wang,Xianguang Wang,Gaoxiang Du
Herein, using black talc as a carrier, a ternary black talc-TiO2/ZnO composite photocatalyst was prepared by the sol-gel method, and the effect of the black talc on the hetero-structure properties of the TiO2and ZnO was systematically studied. The prepared composite photocatalyst showed an excellent degradation performance of the pollutant, where black talc plays an important role in promoting the interface interaction by enhancing the contact area between the TiO2and ZnO. Moreover, the free carbon element doping in black talc favors the formation of more oxygen vacancies, thereby improving the response as a photocatalyst in visible light. In addition, the carbon in the black talc can also adsorb organic pollutants and enrich the surroundings of the photocatalyst with pollutants, so it further improves the catalytic efficiency of the photocatalyst. Under UV irradiation, the degradation rate of Rhodamine B on black talc-TiO2/ZnO was found 3.3 times higher than that of black talc-TiO2with good stability.Keywords:black talc carrier;heterostructure;photocatalyst;TiO2;ZnO
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Mineral Processing and Extractive Metallurgy Review
·
2024
·
IF 4.6
Guangsheng Zeng,Wei Chen,Liu Yang,Sheng Liu,Guangyi Liu
Talc is a naturally hydrophobic mineral. Its separation from sulfide minerals is a tough issue in froth flotation. In this study, calcium lignosulphonate (CLS) was introduced as a talc depressant during sodium isobutyl xanthate (SIBX) flotation of chalcopyrite. The micro-flotation findings showed that under pH 5.0–10.5, the combination application of CLS and SIBX achieved a selective flotation separation of chalcopyrite from talc. The results of zeta potential, contact angle, adsorption capacity and in-situ AFM deduced that both talc and chalcopyrite exhibited a favorable affinity toward CLS, and SIBX hardly changed the adsorption of CLS on talc surface, while significantly reduced that on chalcopyrite. The Ca2+ ions of CLS played a bridging role in connecting lignosulphonate (LS) anions and the negatively charged Si-O layers through electrostatic attraction, which transformed talc surface from hydrophobicity into hydrophilicity. The Cl− ions weakened the adsorption of LS anions on the Ca2+-modified talc surface, and the adsorption affinity of Na+ ion toward the Si-O layers was much weaker than that of Ca2+ ion. Thus, CLS exhibited the strongest depression against talc’s floatability, followed by CaCl2 + SLS (sodium lignosulphonate), and then SLS. SIBX chemisorbed on to chalcopyrite via forming the surface Cu-IBX complexes, which removed the adsorbed LS anions and recovered the floatability of chalcopyrite. The CLS-hydrophilized talc and SIBX-hydrophobized chalcopyrite exhibited the different surface wettability, and they both loaded negative charges, which prevented the aggregation of their particles, resulting in a highly efficient flotation separation chalcopyrite from talc.
研究领域:
矿物加工工程
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表面化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2024
·
IF 5.3
Wenyi Zhang,Chen Li,Qian Xu,Kaibo Hu,Hao Chen,Yucheng Liu,Yinhua Wan,Juanjuan Zhang,Xuewei Li
The extraction process of ion-type rare earth mines generates a significant amount of wastewater containing rare earth elements (REE) with low concentration. It is of great significance to recover REE from the wastewater in order to reduce environmental toxicity and improve the utilization efficiency of rare earth mining. We propose a strategy to enhance the adsorption and enrichment of REE in wastewater by mechanically activating talc, which exposes the hydroxyl groups within the double layered hydroxide to the surface. The effects of various factors, including ball milling time, milling speed, initial pH and initial concentration on rare earth adsorption were investigated. Additionally, the adsorption mechanism of the process was studied by exploring conditions of reaction temperature, reaction time and dosage. The results demonstrated that the adsorption of REE onto the activated talc followed Langmuir isotherm model. At 318.15 K, the maximum adsorption capacity could reach 64.09 mg·g −1 . These findings highlight the simple and cost-effective recovery of REE from wastewater, offering significant potential for widespread application in the treatment of rare earth industrial wastewater.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
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2018
·
IF 2.707
Saizhen Jin,Qing Shi,Qiming Feng,Guofan Zhang,Ziyong Chang
Carboxymethyl cellulose (CMC), a negatively charged polymer, is commonly used as a depressant of talc. However, the separation of pyrite and talc can be deteriorated by the presence of calcium ions, which can facilitate the absorption of CMC onto both talc surfaces and pyrite. In this work, carbonate ions were introduced to solve this problem, and the effects of calcium and carbonate ions on the adsorption of CMC were also studied. Micro-flotation results revealed that CO 3 2 - . not only eliminated the inhibition of pyrite by Ca 2+ and CMC, but also had no influence on the depression of talc at pH 6–10. The surface-specific study confirmed that the adsorption of Ca 2+ onto talc basal planes at pH 8.5 was negligible and could be improved by the presence of CO 3 2 - . . The atomic force microscopy analysis showed the correlation between the coverage of CMC onto talc surfaces in the presence and absence of CO 3 2 - . . A mechanism for the adsorption of CMC onto talc surfaces was proposed based on the morphological differences in the presence and absence of CO 3 2 - .
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
Yuhang Che,Wei Chen,Sheng Liu,Guangsheng Zeng,Guangyi Liu
Talc has long been a problematic gangue mineral in sulfide ore flotation due to its natural hydrophobicity. The as-investigated anionic depressants which reacted with the Mg sites on the edge plane of talc always exhibited limited effects because the negatively charged talc particle at pH > 5.0 showed electrostatic resistance for the anion adsorption. Thus, an electrically neutral reagent, fenugreek gum, was introduced as a highly efficient talc depressant in comparison with the sodium carboxymethylcellulose and sodium alginate, coupled with the surface detections on the selective depressant mechanism between chalcopyrite and talc. The micro-flotation results showed that fenugreek gum could selectively depress the talc flotation at lower dosage and wider pH range than sodium carboxymethylcellulose and sodium alginate, suggesting a more efficient depressant role. Surface detection implied that fenugreek gum selectively interacted with the basal plane of the talc surface and remarkably decreased its hydrophobicity mainly through physical adsorption originated from the hydrogen-bonding between the OH group and the [SiO 4 ] tetrahedron. Fenugreek gum adsorbed onto talc with much larger capacity than on chalcopyrite, and had little influence on the adsorption density of collector adsorption on chalcopyrite, indicating the highly efficient selectivity of fenugreek gum toward talc depression.
研究领域:
矿物加工
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化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
·
IF 7.8
Zhi Lei,Hao Tang,Heng Zhang,Yong-Chun Luo,Peng-Fei Xu
The intergrowth phenomenon of chalcopyrite and talc makes the identification of an eco-friendly and efficient depressant crucial for achieving effective separation. In this study, we innovatively employed Ghatti Gum as a talc depressant to improve the flotation separation. The micro-flotation test results demonstrate that, compared to conventional depressants, Ghatti Gum exhibits a stronger depressing effect on talc while maintaining excellent selectivity toward chalcopyrite. Atomic force microscopy (AFM), scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDS), and transmission electron microscopy (TEM) images confirmed that Ghatti Gum adsorbed selectively on the surface of talc, which significantly altered its surface roughness and elemental composition. In contrast, Ghatti Gum exerts a weaker influence on chalcopyrite. Further analysis through Zeta potential, Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and density functional theory (DFT) calculations revealed that Ghatti Gum adsorbs onto the talc surface through hydrogen bonds and hydrophobic interactions. Meanwhile, Ghatti Gum has less influence on the elemental composition and floatability of the chalcopyrite surface. In summary, Ghatti Gum emerges as a promising eco-friendly depressant for the flotation separation of chalcopyrite and talc. This discovery not only expands the applications of Ghatti Gum but also provides novel insights for the efficient separation of chalcopyrite from talc.
研究领域:
矿物加工
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材料科学
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
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2017
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IF 2.324
Yangyang Hong,Lijie Chen,Guolin Song,David Bassir,Simin Cheng,Xinghong Shi,Haifeng Liu,Guoyi Tang
The biodegradable composites with low cost and excellent mechanical property, namely PLA/talc blends, have been successfully prepared by using epoxidized soybean oil (ESO) as a reactive compatibilizer with the presence of peroxides to accelerate the in situ grafting between talc and other components. The surface treatment of talc powder was performed through the in situ reactions of its rich hydroxyl groups with the epoxide ring of ESO and scission radical of PLA during the blending process. Both FTIR and the extracting experiment results verified that surface modification mechanisms. Such a facile and efficient one-step process can bring a dramatic improvement on both miscibility and mechanical properties of the PLA/talc composites. POLYM. COMPOS., 39:E1618–E1625, 2018. © 2017 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2017
·Vol. 15
·期 3
·633-642
·
IF 1.048
Hui Yu,Zhihao Xu,Ziye Wei,Yongjun Chen,Jianbao Li,Lijie Luo
Alumina (Al 2 O 3 ) ceramics were prepared with nucleating agent of titania (TiO 2 ) and fluxing agent of talc by the normal pressure sintering method. The effects of TiO 2 and talc on phase composition, microstructure, and mechanical properties of Al 2 O 3 ceramics, as well the strengthening and toughening mechanism were investigated. It was found that the introduction of TiO 2 could be favorable for mullite formation and the improved densification of ceramics, resulting in improved mechanical properties of ceramics as well. Ceramics possess the best comprehensive mechanical performance with fracture toughness of 3.69 MPa·m 1/2 and flexural strength of 255.9 MPa when 4 wt.% TiO 2 and 15 wt.% talc were added. Mineral bridges and nanocrystallites were found in the glass-ceramics, which caused the deflection of cracks so that it strengthened the grain boundary and improved the mechanical properties of ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Haiyan Wu,Yuhang Meng,Menghan Yu,Huaming Yang
The overuse or abuse of antibacterial drugs has led to serious health problems. At present, among various antimicrobial materials (natural, organic, inorganic, etc.), inorganic antimicrobial materials, especially ZnO, have received widespread attention. However, an important factor that influences the function of nanoparticles is agglomeration. The agglomeration-sensitive nature of ZnO compromises its antibacterial properties . Here, talc is used as a substrate to control the size and dispersion of ZnO, forming composite minerals with excellent antibacterial properties against both Escherichia coli and Staphylococcus aureus . According to transmission electron microscopy , ZnO/talc is easily adhered to bacterial cells, whereas atomic force microscopy reveals that antibacterial effects are caused by non-covalent interactions between ZnO/talc and bacterial membranes. The comprehensive investigation of antibacterial performance and interfacial interaction is conducive to our understanding of the antibacterial mechanism of inorganic compounds , and also provides new perspectives on the biological effects of inorganic nanomaterials .
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Guoliang Zhang,Zixuan Fan,Xu Zhang,Zehai Xu,Qin Meng
In this work, ultrathin planar alumina-based ceramic membranes with asymmetric structure and thickness less than 0.85 mm were successfully prepared by one-step molding phase transformation/sintering method using low-cost black talc (BT) nanosheets for the first time. The microstructure, pore structure , mechanical strength and permeability of novel ceramic membranes were systematically investigated with different BT amount and sintering temperatures . The doping of BT nanosheets effectively modulated the interfacial bonding area and strength between the grains, achieving significant increase in flexural strength through the evolution of the dense layer structure. The asymmetric structural features formed by the phase transformation/sintering process in combination with polymer substrate significantly reduced the thickness of effective separation layer, thus weakening the loss of flux caused by the densification of the film layer due to the interfacial modification process. Moreover, the organic carbon layers between BT layers were oxidized during the sintering process, forming fine pores and increasing the porosity, which showed to be unique characteristic different from other clay mineral materials. The prepared composite membrane had the pure water flux up to 16335 L m −2 h −1 /bar at 1350 °C sintering, which achieved stable permeation of ∼5200 L m −2 h −1 /bar and high retention over 90% for O/W emulsions.
研究领域:
材料科学
·
化学工程
✓ 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）