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Insights into the separation of chalcopyrite from pyrite in Mg and Ca using gum acacia, xanthomonas campestris and guar gum: An experimental study validated by theoretical investigations
Minerals Engineering ( IF 4.9 ) Pub Date : 2024-10-15 , DOI: 10.1016/j.mineng.2024.109047
Levie Mweene, Govinda Prasad Khanal

The surface chemistry of chalcopyrite (Cpy) and pyrite (Py) in presence of water containing with Mg and Ca was studied using gum acacia (GA), xanthomonas campestris (XC) and guar gum (GG) as depressants. The adsorption density of XC and GA beyond IEP of Cpy and Py in absence of metal ions was nil, whereas that of GG increased with increase in pH till at pH 9.4. However, in presence of Mg and Ca, the adsorption of XC was higher than that of GA and that of GG was higher onto mineral-metal than onto mineral. Further, the adsorption of XC, GA and GG onto mineral-Mg was more than that onto mineral-Ca and this was due to higher maximum molecular electrostatic potential (MESP) of Mg species (413.3 kcal/mol) relative to Ca species (253 kcal/mol). Additionally, the polysaccharides’ adsorption onto Py-Ca and Py-Mg was higher than onto Cpy-Mg and Cpy-Ca. On Cpy and Py with metal ions, the adsorption of XC and GA decreased with increase in pH attesting to polysaccharides anionicity. Theoretical analysis of complexes formed on Py and Cpy surfaces containing Mg and Ca, and polysaccharides was due to conventional hydrogen bonding, non-covalent and partially covalent bonding. Flotation of synthetic mixture of Py and Cpy (1:1) in presence of Mg at pH 9.5 performed better than other systems yielding Cu grade and recovery of 31.1 % and 85.6 % after 80 g/t of XC. Therefore, XC is a potential Py depressant in presence of Ca and Mg species.

中文翻译:


使用阿拉伯树胶、油菜黄单胞菌和瓜尔豆胶分离镁和钙中黄铜矿和黄铁矿的见解:一项经过理论调查验证的实验研究



以阿拉伯树胶 (GA)、油菜黄单胞菌 (XC) 和瓜尔豆胶 (GG) 为抑制剂,研究了黄铜矿 (Cpy) 和黄铁矿 (Py) 在含 Mg 和 Ca 的水存在下的表面化学。在无金属离子的情况下,Cpy 和 Py 超出 IEP 的 XC 和 GA 的吸附密度为零,而 GG 的吸附密度随着 pH 的增加而增加,直到 pH 值为 9.4。然而,在 Mg 和 Ca 存在下,XC 的吸附率高于 GA,GG 在矿物金属上的吸附率高于在矿物上的吸附率。此外,XC、GA 和 GG 对矿物-Mg 的吸附大于对矿物-Ca 的吸附,这是由于 Mg 物质的最大分子静电电位 (MESP) (413.3 kcal/mol) 高于 Ca 物质 (253 kcal/mol)。此外,多糖对 Py-Ca 和 Py-Mg 的吸附高于对 Cpy-Mg 和 Cpy-Ca 的吸附。在含有金属离子的 Cpy 和 Py 上,XC 和 GA 的吸附随着 pH 值的增加而降低,证明多糖具有阴离子性。对在含有 Mg 和 Ca 以及多糖的 Py 和 Cpy 表面上形成的复合物的理论分析是由于传统的氢键、非共价键和部分共价键。在 pH 值为 9.5 的 Mg 存在下,Py 和 Cpy 的合成混合物 (1:1) 的浮选性能优于其他系统,在 80 g/t XC 后产生铜品位和 31.1% 和 85.6% 的回收率。因此,XC 在 Ca 和 Mg 物种存在下是一种潜在的 Py 抑制剂。
更新日期:2024-10-15
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