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    Wyświetlanie 1-3 z 3
    Tytuł:
    Application of diethylenetriaminepenta pentasodium salt as an eco-friendly depressant to effectively improve the flotation separation of scheelite and calcite
    Autorzy:
    Zhou, Hepeng
    Wu, Handan
    Guo, Jiangfeng
    Tang, Xuekun
    Huang, Wen
    Luo, Xianping
    Powiązania:
    https://bibliotekanauki.pl/articles/27323649.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    flotation
    scheelite
    calcite
    diethylenetriaminepenta pentasodium salt
    depressant
    adsorption
    Opis:
    Diethylenetriaminepenta (methylene-phosphonic acid) pentasodium salt (DTPMPA), an eco-friendly reagent, was tried for the first time as a depressant for flotation separation of scheelite from calcite. Micro-flotation tests show that DTPMPA can selectively depress the floatability of calcite. In contrast, DTPMPA barely affects the flotation behavior of scheelite. Based on the selective depress effect, floatation separation of scheelite and calcite can be effectively achieved by using DTPMPA as depressant in artificially mixed minerals flotation tests. Based on a series of measurements, it found the surface of calcite was positively charged due to the existence of Ca ion site, which can be chelated with –PO3H- functional group on the surface of DTPMPA. In the flotation process, DTPMPA can be chemically absorbed on the surface of calcite to inhibit further collector adsorption. On contrast, little DTPMPA was adsorbed on the surface of scheelite due to the spatial site resistance and electrostatic repulsion induced by surface WO42+. All in all, these results exhibit DTPMPA has excellent selective depression ability on calcite, which can be potentially applied in the actual scheelite flotation process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 6; art. no. 174718
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective flotation separation of scheelite and calcite by applying methylene phosphonic acid sodium as a novel and green depressant
    Autorzy:
    Zhou, Hepeng
    Wu, Handan
    Guo, Jiangfeng
    Tang, Xuekun
    Huang, Wen
    Luo, Xianping
    Powiązania:
    https://bibliotekanauki.pl/articles/24086193.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    scheelite
    calcite
    inhibition mechanism
    flotation separation
    Opis:
    It is known that the flotation separation of scheelite and calcite is quite difficult due to their similar surface properites. To slove the problem, ethylenediaminetetra (methylene phosphonic acid) sodium (EDTMPS), an environmentally friendly reagent, was employed as an efficient depressant for flotation separation of calcite for the first time. In flotation experiments, it demonstrates that EDTMPS could strongly inhibit the flotation of calcite but barely affect the flotaiton behavior of scheelite, showing excellent dpress ability and selectivity. Based on a series of measurements including contact angle analysis, zeta potential, and XPS analysis, it was found that large amout of EDTMPS could be absorbed on the surface of calcite through strong chemical chelation reaction and thus inhibiting the further adsorption of NaOL. On the contrary, little EDTMPS was absorbed on that of scheelite owing to the negatively charged tungstate ions on the surface in relative terms. All in all, these results exhibit EDTMPS has excellent selective inhibition ability on calcite, which can be potentially applied in actual scheelite and calcite flotation separation process.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168517
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancing flotation of smithsonite by using 1,3,5-Triazinane-2,4,6-trithione as sulfidation
    Autorzy:
    He, Kunzhong
    Zhou, Hepeng
    Zhang, Yongbing
    Tang, Xuekun
    Luo, Xianping
    Han, Haisheng
    Powiązania:
    https://bibliotekanauki.pl/articles/1446972.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    1,3,5-Triazinane-2,4,6-trithione(TMT)
    sodium sulfide
    flotation
    sulfidation
    Opis:
    1,3,5-Triazinane-2,4,6-trithione (TMT) was used for the first time as a sulfidation agent in the flotation of smithsonite. Results showed that 80.5% recovery rate could be obtained in the presence of TMT $(5 × 10^{-5} mol$ / $L)$ and butyl xanthate $(5 × 10^{-4} mol$ / $L)$. However, the recovery rate was only 59.4% when sodium sulfide $(5 × 10^{-5} mol$ / $L)$ was used. Micro-flotation test and contact angle measurement showed that TMT activation was better than sodium sulfide activation. Besides, the contact angle increased from 32.44° (untreated) to 89.58° (treated with TMT), which was significantly higher than 50.2° (treated with sodium sulfide). Fourier Transform Infrared spectroscopy(FT-IR) and Zeta potential test showed the chemisorption of TMT on the smithsonite surface. The results of ICP spectral detection and solution chemistry calculation revealed that $Zn_3TMT$ complex precipitates in the smithsonite pulp were formed on the mineral surface at pH 6.5. A hydrophobic film was also formed on the mineral surface after TMT treatment, and more adsorption sites were provided for butyl xanthate. Thus, the adsorption of collector was significantly enhanced.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 5; 1-14
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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