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学者姓名:曾广圣
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Abstract :
3-Ethyl-4-pyridylamidoxime (EPA) and 3-methyl-5-tert-butyl-4-pyridylamidoxime (MBPA) were introduced as the collectors in the flotation and enrichment of malachite from calcite and quartz. Compared with MBPA and the traditional collector benzohydroxamic acid (BHA), EPA exhibited a better flotation performance. Its collecting ability to malachite was stronger than BHA, and its selectivity toward calcite and quartz was better than MBPA. In the absence of Pb2 + ions, 2.0 x 10(-4) mol/L EPA at pH 8.0 could recover about 86 % malachite, 20 % calcite and 22 % quartz. Under the same conditions, BHA floated out around 58 % malachite, 27 % calcite and 10 % quartz. The contact angle and SEM proved that EPA could enhance the surface hydrophobicity of malachite via corrosion to produce more active sites for its heavy adsorption. FTIR and XPS revealed that EPA would chelate with the surface Cu atom to form -O-Cu and -N-Cu bonds. EPA owned stronger electron-donating ability and worse electron-accepting ability than BHA, which brought a stronger chemical reactivity. Moreover, its isomer could further enhance the adsorption ability onto malachite. The novel amidoxime collector EPA was able to efficiently lead-free enrich malachite and enhance the industrial capacity to treat copper oxide ores.
Keyword :
Amidoxime Amidoxime Chelation Chelation Corrosion Corrosion Lead-free flotation Lead-free flotation Malachite Malachite
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GB/T 7714 | Cheng, Chen , Zeng, Guangsheng , Huang, Zhiqiang . Efficient lead-free flotation separation of malachite from calcite and quartz by using amidoxime collectors [J]. | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 708 . |
MLA | Cheng, Chen 等. "Efficient lead-free flotation separation of malachite from calcite and quartz by using amidoxime collectors" . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 708 (2025) . |
APA | Cheng, Chen , Zeng, Guangsheng , Huang, Zhiqiang . Efficient lead-free flotation separation of malachite from calcite and quartz by using amidoxime collectors . | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS , 2025 , 708 . |
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Talc is a layered silicate mineral with pronounced crystal anisotropy, consisting of a basal (001) surface and an edge (100) surface, which complicates its separation from valuable minerals. In this study, tannic acid (TA) was used as a depressant, and its adsorption behaviors on the two representative surfaces of talc-silica (basal plane surface) and magnesium silicate (edge surface)-were systematically investigated using experimental methods and molecular simulations. TA addition reduced the contact angles of the talc basal and edge surfaces by 30.5 degrees and 22.7 degrees, respectively, indicating enhanced hydrophilicity. ToF-SIMS analysis revealed that TA physically adsorbs onto the silica surface, while both physical and chemical interactions occur on the magnesium silicate surface. AFM showed lumpy adsorbate on the silica surface and point-like adsorbate on the magnesium silicate surface, with a greater roughness change observed for the former. QCM-D measurements confirmed that TA formed a multilayer flexible adsorbate on the silica surface and a dense, rigid monolayer on the magnesium silicate surface. Molecular dynamics simulations further revealed that van der Waals interactions dominated TA adsorption on the (001) surface, while electrostatic interactions prevailed on the (100) surface. These findings provide insight into the selective depression mechanism of talc and offer guidance for the depression of other layered silicate minerals.
Keyword :
Adsorption behavior Adsorption behavior Basal plane surface Basal plane surface Edge surface Edge surface Talc Talc Tannic acid Tannic acid
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GB/T 7714 | Cai, Jiaozhong , Zhong, Shuiping , Deng, Jiushuai et al. Study on the adsorption behavior and adsorption mechanism of green depressant TA on the basal plane and edge surface of talc [J]. | MINERALS ENGINEERING , 2025 , 232 . |
MLA | Cai, Jiaozhong et al. "Study on the adsorption behavior and adsorption mechanism of green depressant TA on the basal plane and edge surface of talc" . | MINERALS ENGINEERING 232 (2025) . |
APA | Cai, Jiaozhong , Zhong, Shuiping , Deng, Jiushuai , Wu, Bozeng , Xu, Chengyan , Chi, Xiaopeng et al. Study on the adsorption behavior and adsorption mechanism of green depressant TA on the basal plane and edge surface of talc . | MINERALS ENGINEERING , 2025 , 232 . |
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Conventional silver powder production routes, which reduce silver nitrate solution in the presence of a polymer protective agent, complicate subsequent powder cleaning and wastewater treatment. This study proposes a sulfate-based inorganic protective agent (utilizing Ag2SO4 precursor replacement) that serves dual functions: morphology stabilization and wastewater treatment simplification. This innovation enables the environmentally friendly preparation of sub-micron spherical silver powder. The effects of peristaltic pump flow rate, pH value, temperature, concentration ratio of oxidant to reducing agent on the particle size and morphology of silver powder were systematically investigated. The resulting silver powder exhibited an average particle size of 0.64 +/- 0.05 mu m and excellent thermal stability (weight loss rate < 0.50 % up to 1000 degrees C). Mechanistic analysis via combined XRD, Zeta potential measurements, and density functional theory (DFT) calculations revealed that SO(4)(2- )preferentially adsorbs on Ag(111) facet via chemisorption. Moreover, the production wastewater can be directly treated biochemically after calcium oxide precipitation and air-stripping treatment. Furthermore, the scale-up experiment (single yield 50.0 g) showed that the performance of the experimental product was consistent with the lab-scale results, indicating that the process has good reproducibility.
Keyword :
Ascorbic acid Ascorbic acid Density functional theory Density functional theory Silver powder Silver powder Silver sulfate Silver sulfate Sulfate ions Sulfate ions
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GB/T 7714 | Chen, Jianghao , Huang, Shaoyi , Zhong, Shuiping et al. Scalable synthesis of submicron spherical silver powders mediated by sulfate ions: Dual-function protection mechanism for morphology control and simplified wastewater treatment [J]. | JOURNAL OF CLEANER PRODUCTION , 2025 , 525 . |
MLA | Chen, Jianghao et al. "Scalable synthesis of submicron spherical silver powders mediated by sulfate ions: Dual-function protection mechanism for morphology control and simplified wastewater treatment" . | JOURNAL OF CLEANER PRODUCTION 525 (2025) . |
APA | Chen, Jianghao , Huang, Shaoyi , Zhong, Shuiping , Tan, Wen , Zeng, Guangsheng , Weng, Wei et al. Scalable synthesis of submicron spherical silver powders mediated by sulfate ions: Dual-function protection mechanism for morphology control and simplified wastewater treatment . | JOURNAL OF CLEANER PRODUCTION , 2025 , 525 . |
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