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    Wyświetlanie 1-8 z 8
    Tytuł:
    Enhanced sulfidation of chrysocolla with ammonium carbamate and its effect on flotation
    Autorzy:
    Wang, Ziang
    Wu, Dandan
    Cao, Jing
    Chen, Huiqin
    Powiązania:
    https://bibliotekanauki.pl/articles/24085837.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    chrysocolla
    ammonium carbamate
    surface modification
    sulfidation
    Opis:
    In this study, flotation experiments, zeta potential, XPS, AFM, SEM-EDS, and contact angle measurements were performed to study the influence of ammonium carbamate (CH6N2O2) on the sulfidation flotation of chrysocolla. The results of the sulfidation flotation experiments showed that the recovery of chrysocolla increased more than 40% on the optimal condition after adding ammonium carbamate. In addition, the zeta potential of samples with ammonium carbamate was clearly higher than ores for pH > 6, which was due to the complexation reaction between ammonium carbamate and copper ion on the surface of chrysocolla samples. The activity of copper adsorption has also been improved. Furthermore, the XPS data indicated that the content of Cu-S compounds on the mineral surface has been significantly enhanced after ammonium carbamate complex sulfidation. The chemical analysis of the solution led to the same conclusion. The AFM results showed that ammonium carbamate had a positive impact on the adsorption of minerals surface, and increased the flotation recovery. It can be deduced from the SEM-EDS analysis that the surface of chrysocolla better combined with S–, and more Cu-S components were generated on the surface, which led to 1.04% increase of S atomic concentration. Finally, the contact angle measurements showed that the water contact angle of chrysocolla after adding ammonium carbamate could reach 90.4°, which proved that the sulfidation improved the floatability of the chrysocolla sample.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; atr. no. 168573
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on surface modification of cerussite by thermochemical processing with pyrite
    Autorzy:
    Zheng, Yong-Xing
    Ning, Ji-Lai
    Xie, Haiyun
    Lv, Jin-Fang
    Hu, Pan-Jin
    Pang, Jie
    Powiązania:
    https://bibliotekanauki.pl/articles/1448573.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cerussite
    pyrite
    surface modification
    thermochemical processing
    flotation
    Opis:
    In this paper, surface modification of cerussite by thermochemical processing with pyrite was studied based on microflotation tests, X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS) and electron probe microanalysis (EPMA). Microflotation test results showed that the surface modification facilitated flotation of the treated cerussite and improved the flotation recovery to approximately 90%. The results of XRD analyses confirmed that cerussite was transformed into massicot, which then interacted with pyrite to form $PbS$, $PbSO_4$, $PbO•PbSO_4$ and $4PbO•PbSO_4$. XPS analyses results revealed that both $PbS$ and $PbS_2$ were formed on the mineral surface, and the percentage of $PbS$ increased with increasing $FeS_2$/$PbCO_3$ (F/P) mole ratio, which was advantageous for the flotation of the modified cerussite. EPMA analyses showed that particles with layered configurations were obviously formed after thermochemical processing. The thickness of the products at the outer layer of the particles increased when the F/P mole ratio increased. Moreover, the S and O contents in the products increased and decreased, respectively.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 1; 156-167
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface modified bentonite mineral as a sorbent for $Pb^{2+}$ and $Zn^{2+}$ ions removal from aqueous solutions
    Autorzy:
    Selim, K.haled A.
    Rostom, Merit
    Youssef, Mohhamed A.
    Abdel-Khalek, Nagui A.
    Abdel-Khalek, Mohhamed A.
    Hassan, El-Sayed R. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1450133.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Ca-montmorillonite
    adsorption
    heavy metals
    surface modification
    rheology
    Opis:
    Environmental pollution by lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions has become an important issue due to its harmful effects on human health and environment. This work aims to evaluate the application of surface modified Egyptian bentonite mineral by acid activation using $H_2SO_4$ and thermal treatment as an adsorbent to remove lead ($Pb^{2+}$) and zinc ($Zn^{2+}$) ions from aqueous solution. X-ray diffraction (XRD), Fourier Transformed Infrared Spectroscopy (FTIR) and Scanning Electron Microscope (SEM) techniques were used to investigate the modified bentonite. The impact of organic and inorganic dispersants on rheological characteristics of bentonite suspensions was investigated. Adsorption of $Pb^{2+}$ and $Zn^{2+}$ ions using modified bentonite mineral was performed with different adsorbent doses and pH values. Removal efficiencies of lead and zinc are 99.67% and 99%, respectively with adsorbent dose of 25 g/l at pH of 6.2.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2020, 56, 6; 145-157
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of polyacrylic acid molar mass as a surface modifier on rheological properties of calcium carbonate suspensions
    Autorzy:
    Selim, Khaled Abdelaal
    Farghaly, Mohamed Galal
    Abdallah, Samah Saleh
    Abdel-Khalek, Mohamed Abdel-Dayem
    Powiązania:
    https://bibliotekanauki.pl/articles/1446411.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcium carbonate
    surface modification
    poly-acrylic acid
    rheology
    adsorption
    Opis:
    Suspensions of calcium carbonate are of a major concern in various fields, such as coating, painting and ceramics and their rheological properties are very important. The effect of polyacrylic acid (PAA) of different molecular mass as a surface modifier on the surface and rheological properties of the aqueous suspension of calcium carbonate was investigated. The effect of the volume fraction of particles and polymer concentration on the viscosity at lower shear rate was discussed. The flow behavior of the concentrated suspension in the presence of PAA can be explained by the difference of the repulsive force among particles, induced by the adsorbed polymer. The results showed that the dispersibility is more pronounced by the steric hindrance behavior rather than the electrostatic behavior.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 18-26
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of dodecanol on wetting behavior of superhydrophobic surfaces
    Autorzy:
    Sayfutdinova, A. R.
    Emelyanenko, A. M.
    Boinovich, L. B.
    Powiązania:
    https://bibliotekanauki.pl/articles/109392.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    surface modification
    laser treatment
    anodic etching
    superhydrophobicity
    wettability
    nanostructured surfaces
    Opis:
    Digital processing of the optical image of a sessile droplet was used to study the influence of dodecanol vapors and condensate on the wettability of superhydrophobic coatings by water. Two types of coatings with very different morphologies were used to estimate the stability of the superhydrophobic state in the presence of dodecanol at different regimes of interaction of tested superhydrophobic coatings with dodecanol vapors, including preliminary condensation of dodecanol inside the substrate pores/grooves at different temperatures, a short-term contact of dodecanol vapor with the superhydrophobic coating with the preliminary deposited water droplets and, finally, a long-term contact between substrate with deposited water droplets and the vapor phase saturated with dodecanol vapor. The set of experimental data indicate only minor variations of water contact and roll-off angles for all regimes studied. Such wettability behavior evidences good persistence of superhydrophobic state in conditions of contact with long-chain alcohol vapors.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 1; 131-141
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Changes of surface properties of calcite particles with calcium stearate using conventional experimental design and properties of coated calcite
    Autorzy:
    Ucurum, M.
    Bayram, O.
    Toraman, O. Y,
    Kılıc, H.
    Yalcın, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/109347.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcite
    surface modification
    mechano-chemical
    calcium stearate
    properties of modified calcite
    Opis:
    Calcite is utilized as a filler mineral in the industries such as plastics, rubber, and paint, to gain products with a variety of features. In order to use a calcite ore as a filler, some specific physical and physico-chemical properties are required such as ultra-fine sizes and conversion of hydrophilic to hydrophobic structure. In the present study, for these purposes, surfaces of the ultra-fine calcite powder (d50=2.94 μm) were coated by a mechano-chemical process with calcium stearate [Ca(C17H35COO)2] in a stirred ball mill. The influence of operating parameters such as calcite filling-ratio, ball-filling ratio, operation speed, grinding time and chemical dosage on the active ratio (%) was systematically examined. Then, the properties of modified calcite product were measured and evaluated by contact angle, TGA, DTA, FTIR, and SEM. The results showed that the mechano-chemical technology is very effective for modifying the surface of micronized calcite products using calcium stearate chemical.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2018, 54, 3; 688-700
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applicability of statistical process control for surface modification plant and properties of coated calcite
    Autorzy:
    Ucurum, M.
    Malgir, E.
    Deligezen, H.
    Karaer, N.
    Avsar, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/110501.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    calcite
    surface modification
    pin mill plant
    statistical process control
    coated calcite properties
    Opis:
    Due to its low surface energy, easy dispersion, high homogeneity and whiteness, coated (modified) calcite has increasingly been used in many industries, particularly in the plastics. The demand for this product will most likely increase in the years to come. Surface modification of calcite with a fatty acid would lead to a great expansion of industrial applications. The color values of coated calcite products are the first quality parameter. Therefore, it is very important to monitor the variations in the color characteristics of the coated calcite products. It is well known that statistical process control (SPC) techniques have been widely used in the many industries. In the present study, the surface of micronized calcite was coated with stearic acid by a pin mill. X-R control graphics and process capability index were applied for monitoring variations in quality control based on color parameters (L*, a* and b*) for the pin mill plant. In addition, active ratio, particle size distribution, whiteness parameters, BET, FTIR, TGA-DTA and SEM were then determined on a coated calcite sample. The results show that the pin mill plant seems under control and the coating technology is very effective in modifying the surface of micronized calcite products.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2016, 52, 2; 803-820
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis and physicochemical characteristics of titanium dioxide doped with selected metals
    Autorzy:
    Siwinska-Stefanska, K.
    Paukszta, D.
    Piasecki, A.
    Jesionowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/951839.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    titanium dioxide
    sol-gel method
    doping
    TiO2 surface modification
    Fe and Co dopant
    Opis:
    The paper details with of the preparation and physicochemical characterisation of nano- and microstructured TiO2 doped with Fe and Co produced by the sol-gel method using titanium alkoxide as the precursor of titania as well as iron or cobalt nitrates as dopant sources. Fe and Co doped TiO2 materials were successfully prepared with two different methods. The effect of the dopant type on the synthesis of TiO2 powders was investigated. The physicochemical properties of the studied samples were determined. The characterisation included determination of the dispersion and morphology of the systems (particle size distribution, SEM images), characteristics of porous structure (BET isotherms), crystalline structure (XRD), surface composition (EDS), as well as thermal stability (TG/DTA).
    Źródło:
    Physicochemical Problems of Mineral Processing; 2014, 50, 1; 265-276
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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