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
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Heng Yu,Wei Sun,Chenyang Zhang,Zechao Huangfu,Fuchao Fan
In the field of mineral processing, the flotation separation of talc and molybdenite has long faced severe challenges, and the development of efficient flotation depressants is a crucial research direction to address this issue. Due to the complex pulp environment, the selective depression effect of a single flotation depressant is relatively poor and significantly influenced by pH levels. In contrast, combined depressants offer advantages such as synergistic depression mechanisms, multi-target action, and less sensitivity to pulp environment, making them the core technical for the flotation separation of talc and molybdenite. This study innovatively employs sodium carboxymethyl starch (CMS) and Aluminum chloride (AlCl₃) as combined depressants for the separation of talc and molybdenite and systematically compares the differences in adsorption behavior and mechanisms on different crystal surfaces of talc and molybdenite using various characterisation methods in conjunction with micro-flotation experiments. The results indicate that the unique structures and wettability differences of the various crystal surfaces of talc and molybdenite are the direct reasons affecting the depression effectiveness of the combined depressants. Further research shows that CMS and AlCl₃ first form a complex, which then adsorbs onto the surface of talc, with the combined adsorbent exhibiting stronger adsorption on the talc (100) surface than on the (001) surface. Flotation results indicate that when the concentration of CMS is 0.25 × 10⁻³ mol/L, the recovery rate of molybdenite reaches its highest at 92.51 %; conversely, when the concentration of CMS is 1.25 × 10⁻³ mol/L, the recovery rate of talc drops to its lowest at 13.01 %. This research offers a new technological avenue for the efficient selective separation of talc-containing molybdenite systems, showcasing significant industrial application value.
研究领域:
矿物加工
·
浮选技术
·
表面化学
·
吸附机理
·
络合化学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Hao Yi,Yunliang Zhao,Feng Rao,Shaoxian Song
In this work, hydrophobic agglomeration of fine talc particles in aqueous solutions under mechanical conditioning and without any addition of surfactants has been experimentally studied. A method of in-situ measurement of turbidity of flocs suspension in the settlement process has been applied, and the turbidity as a function of settling time has been attempted to fit a certain function so as to assess the hydrophobic agglomeration behaviors. Effects of kerosene dosages, stirring rate, and wettability of talc particles on the hydrophobic agglomeration behaviors have been investigated. The results show that the addition of kerosene can greatly enhance the aggregation of colloidal talc in aqueous suspensions. Besides, the stirring strength and duration make an enormous influence on the aggregation through providing the kinetic energy for overcoming the energy barrier between the approaching particles. It is also found that the wettability of talc is closely related to the aggregation degree. More hydrophobic talc particles show a much stronger aggregation behaviors.
研究领域:
矿物加工
·
胶体科学
·
表面化学
✓ 已验证
DOI
高影响因子
Royal Society Open Science
·
2018
·Vol. 5
·期 2
·
IF 2.504
Wen-Li Qin,Tian Xia,Ying Ye,Ping-Ping Zhang
In this study, the electromagnetic (EM) performance of talc/NiTiO3 composite was evaluated. The morphology of talc displayed a lamella structure; there were many nanoparticles of NiTiO3 coated on the talc lamella. Thermal destruction occurred, which increased the surface area from 2.51 m2 g−1 to 79.09 m2 g−1 at the calcined stage at 650°C. The presence of NiTiO3 increased dielectric loss and magnetic loss of talc. The calculation of EM wave absorption of talc/NiTiO3 obtained a maximum reflection loss of −11.94 dB at the thickness of 6.85 mm; the optimum thickness for microwave absorption is 6.3–7.3 mm. This study revealed a new approach for fabricating an EM absorber and broadening applications of both talc and NiTiO3 in EM absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 9
·6558-6565
·
IF 1.483
Qin Wen-Li,Lv Han,Xia Tian,Ye Ying,Chen Xue-Gang,Lyu Shuang-Shuang
Talc is a layered silicate that was long recognized as un-intercalated. In this study, we prepared a novel talc/TiO2 nanocomposite by intercalating tetrabutyltitanate (TNBT) into talc and then hydrolyzing and calcining them at 500 °C. The XRD and TEM characterizations
suggested that we successfully intercalated TNBT into the talc layers while the original layered structure was preserved. The pore volumes and BET surface areas were enhanced greatly during the preparation of the nanocomposite, which induced higher methylene blue (MB) adsorption when compared
with the acidified talc. The photocatalytic degradation capacity of the samples increased significantly with the loading of TiO2 nanoparticles and TNBT/talc ratios. In addition, the spatial confinement of talc layers may also enhance its photocatalytic activity. The maximum MB removal
rate exceeded 99.8% at 2.0 g L−1. The dimethylamino and methyl groups of MB molecules were preferably degraded according to the full-scan UV-Vis spectra. The MB removal rates increased with initial pH value and declined with initial MB concentration. Furthermore, the as-prepared
talc/TiO2 nanocomposite is a recyclable material according to the recycling experiments. The intercalation of talc and preparation of talc/TiO2 nanocomposite opened a new approach to utilize talc and a novel method to fabricate photocatalytic materials.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF PHOTOENERGY
·
2019
·
IF 2.026
Manqing Ai,Wenli Qin,Tian Xia,Ying Ye,Xuegang Chen,Pingping Zhang
Novel nanocomposites have been prepared by intercalating TiO2 nanoparticles into talc. The nanocomposites have been verified by X-ray diffraction (XRD) from the appearance of a characteristic diffraction peak of TiO2. Thermal behavior of the prepared samples is examined by thermogravimetric analyzer (TGA), scanning electron microscope (SEM), and energy dispersive spectrometer (EDS), which have shown no TiO2 particles on the surface of the talc. The TiO2 particles are found in the layers of talc by transmission electron microscopy (TEM) and the Brunauer-Emmett-Teller (BET) method, which have shown the increase of specific surface areas and total pore volumes and the decline of average pore diameters. As the strong adsorption ability of talc can intensify the power of photon absorption and capture-recombination carriers, more than 99.5% of 2,4-dichlorophenol can be degraded in 1 h by the nanocomposite under an ultraviolet lamp in neutral solution and room temperature after reaching adsorption equilibrium, and the result of adsorbance is in accord with the first-order kinetic. The degradation rate was maintained at about 99% after 20 times. Therefore, the prepared talc/TiO2 nanocomposite is an efficient, stable, and recyclable material for wastewater treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Wanjia Zhang,Liming Tao,Luobing Xun,Zhongxu Qi,Stephen Pooley,Wei Sun,Jian Cao,Zhiyong Gao
Talc is one of the most problematic gangue minerals for molybdenite flotation owing to its strong natural hydrophobicity. In this work, pullulan polysaccharide (PU) was evaluated as a potential depressant in the flotation separation of molybdenite from talc. Bench flotation tests of single mineral samples and multi-mineral samples were carried out to evaluate the performance of PU in flotation. And the results show that under the preferable reagent scheme of 40 mg/L PU, 160 mg/L butyl xanthate (BX) and 25 μL/L MIBC, molybdenite can be effectively separated from talc over a wide pH range (from 2.0 to 8.0). Furthermore, FTIR and XPS analyses demonstrate that BX can desorb the pre-adsorbed PU on the surface of the molybdenite by competitive adsorption, but has only a slight effect on the PU adsorbed on surface of the talc. The results also confirm that PU has a strong and stable adsorption on the surfaces of talc and molybdenite, whereas BX adsorbs more strongly on the surface of molybdenite. Hence, the reagent scheme of PU + BX, with biodegradability, low toxicity, low cost and synergistic selectivity, has great potential for industrial application in the flotation separation of molybdenite from talc.
研究领域:
矿物加工工程
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Weijia Li,Zhichong Wang,Yan Zhu,Guoyou Zhao,Yuanli Zhao,Kaiyou Zhang,Aimiao Qin,Shuoping Chen
Polyaniline hydrogels exhibit good conductivity and biocompatibility, however, their electrical conductivity is susceptible to environmental influences, their stability is limited, and their mechanical properties require improvement. To address the limitations of low strength and short cycle life in polyaniline hydrogels, this study prepared a talc/conductive polyaniline composite hydrogel flexible supercapacitor exhibiting excellent electrochemical performance and high cycling stability. In a mixed system of polyvinyl alcohol (PVA) and polyaniline (PANI), a talc/polyaniline/polyvinyl alcohol (Talc/PANI/PVA) composite material was prepared via the in-situ polymerization of aniline. The Talc/PANI/PVA composite hydrogel electrode exhibited a remarkable specific capacitance of 767 mF cm −2 at a current density of 0.5 mA cm −2 , while maintaining an impressive capacitance retention rate of 93.2 % after 5000 charge-discharge cycles. This indicates both high specific capacitance and exceptional cycling stability. In mechanical evaluations, the composite demonstrated a stress of 7.5 MPa and a strain of 230 %, with an elastic modulus reaching 2.4 MPa, signifying significantly improved mechanical properties. Furthermore, symmetric flexible supercapacitors constructed with the Talc/PANI/PVA composite hydrogel achieved an energy density of 31 μWh cm −2 at a power density of 250 μW cm −2 , retaining 81.1 % of their initial capacitance after 5000 cycles. Three serially connected supercapacitors can power a blue LED for 3 min after charging 20 s. This research has substantial implications for the advancement of high-performance composite hydrogels intended for wearable and flexible energy storage devices.
研究领域:
材料科学
·
能量存储
·
高分子化学
·
电化学
·
柔性电子学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2020
·
IF 3.99
Hao Zhou,Zhengjun Zhang,Leming Ou,Qiongyin Mai
As a typical gangue mineral in many sulfide deposits, naturally hydrophobic talc needs to be depressed by adding depressants to achieve a good flotation separation. Conventional talc depressants lack selectivity , resulting in the depression of both talc and sulfide minerals . In this study, carrageenan was applied as a selective depressant for talc. The mechanism of carrageenan in the flotation separation of chalcopyrite from talc when using collector sodium butyl xanthate (SBX) was investigated. Micro-flotation results showed that carrageenan can efficiently and selectively depress talc and barely influenced the flotation of chalcopyrite. The artificial mixed minerals flotation results further confirmed that carrageenan was a selective depressant for talc. A concentrate with Cu grade of 32.42 % was obtained at 91.86 % recovery from their artificial mixtures of minerals. The flotation results indicated that carrageenan exhibited stronger depressing ability than the conventional talc depressants of CMC and guar gum , suggesting it could become a promising potential depressant in the selective flotation separation of chalcopyrite from talc. Adsorption mechanism of carrageenan on the surface of talc was investigated using zeta potential measurements, adsorption measurements, FTIR measurements, XPS measurements and Langmuir adsorption model. The zeta potential measurements and adsorption measurements indicated that carrageenan selectively adsorbed on talc surface and therefore changed the zeta potentials. The FTIR results and XPS tests illustrated that the adsorption of carrageenan on talc occurred through physical interactions rather than chemical complexation. Langmuir adsorption modeling confirmed the major role of hydrophobic interaction.
研究领域:
矿物加工
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
·
2021
·
IF 5.909
Man-Qing Ai,Hao Du,Shuang-Shuang Lv,Xue-Gang Chen,Chu-Qing Zhang,Wei Cai,Wen-Li Qin,Ying Ye,Chun-Hui Tao
Microwave-enhanced degradation is an effective method to remove organic contaminants from aqueous solutions. In this study, we prepared a novel iron sulfide/talc composite. Under microwave irradiation, the hydroxyl and sulfate radicals are rapidly released from the as-prepared FeS x /talc composite (TF), which could remove 106.8 mg/(min·g) of 2,4,6-TCP in 4 min. The maximum chemical oxygen demand (COD) removal was more than 90.1% when the concentration of TF is 1 g/L and the irradiation time of microwave radiation was 5 min, significantly higher than that treated by FeS x particles or talc. It is attributed to the synergetic effect between talc layers and FeS x particles, which greatly enhances the catalytic degradation performance of the composite for organic pollutants . With the advantages of low cost, high physico-chemical stability, and high reusability, this novel FeS x /talc composite could be a potential treating material for rapidly remove organic pollutants from wastewater.
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MINERALS ENGINEERING
·
2021
·
IF 4.765
Changbin Li,Qing Shi,Guofan Zhang,Hongjiang Liu,Haigang Feng
Talc is a gangue mineral of many sulfide minerals , which is naturally hydrophobic. The depression of talc is very important and challenging in sulfide ore flotation . This research introduced aluminum ions into the process of using carboxymethyl cellulose (CMC) to depress talc. Flotation experiment results showed that aluminum ions used alone exerted a weak depression effect on talc, and that aluminum ions used in conjunction with CMC effectively depressed the flotation of talc at pH 8.5. Results of X-ray photoelectron spectroscopy and adsorption tests showed that the interaction of aluminum ions with talc changed the surface of talc, and Al(OH) 3 formed on the talc surfaces, thereby promoting the adsorption of CMC onto talc and depressing the flotation of talc. On this basis, the morphology of CMC on the talc surface was observed by atomic force microscopy imaging. With the addition of aluminum ions, CMC aggregated to a greater extent, multiple layers adsorbed onto the surface of talc, and the coverage of CMC substantially increased. Based on all tests and analysis, the mechanism of the synergistic effect of CMC and aluminum ions on talc flotation was also proposed.
研究领域:
矿物加工工程
·
浮选化学
·
胶体与界面化学
·
资源利用与冶金
·
表面科学
·
环境工程
·
材料化学
✓ 已验证
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2023
·
IF 5.6
Menghan Yu,Haiyan Wu,Yuhang Meng,Menghan Qu,Huaming Yang
Given the global proliferation of pathogenic microorganisms , there exists a pressing imperative to cultivate efficacious nanomaterials possessing antimicrobial attributes, thereby impeding the transmission of infectious diseases. Clay-based nanoparticles , due to their inherent properties, serve as optimal candidates for the creation of innovative antimicrobial agents, particularly for coating materials . In this study, ZnO nanoparticles were synthesized on talc surfaces and doped with Ag + , yielding an effective antimicrobial composite (Ag-ZnO/talc). The primary aim was to comprehensively evaluate the antimicrobial effectiveness, material compatibility, and biosafety of Ag-ZnO/talc, as well as its potential applications in antibacterial coatings . The finding underscored the remarkable antibacterial properties of Ag-ZnO/talc composites, chiefly through the generation of reactive oxygen species , leading to impairment of the bacterial membrane and leakage of nucleic acid content. A biosafety evaluation indicated minimal cytotoxicity, a low hemolysis rate, and negligible skin tissue reactions, thereby suggesting its suitability for human application. Furthermore, the incorporation of the antimicrobial agent Ag-ZnO/talc did not significantly alter the physicochemical characteristics of the coating, while maintaining an enduring antimicrobial effect for a duration of two months. These findings establish the potential of clay-based antimicrobials for effective and safe application in coatings, facilitating the development of antimicrobial coatings in diverse industrial and public health environments.
研究领域:
纳米材料科学
·
微生物学
·
毒理学
·
材料科学与工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）