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New insights into the surface chemical properties of serpentine and flotation of pyrite using xanthomonas campestris as a novel selective serpentine depressant: Experimental and DFT investigation
Minerals Engineering ( IF 4.9 ) Pub Date : 2024-12-05 , DOI: 10.1016/j.mineng.2024.109141
Levie Mweene, Govinda Prasad Khanal, Emmanuel Etim

The flotation separation of pyrite (Py) from serpentine (Spt) was studied using xanthamonas campestris (XC) as a novel Spt depressant. The adsorption of XC onto Spt and Py was observed to decrease with increase in pH attesting to increased repulsion between the negatively charged carboxylate portion of XC and the increased negativity of the mineral surface. However, the polysaccharide adsorption onto Py was less than that onto Spt due to a higher iso-electric point (IEP) of Spt compared to that of Py. Further, theoretical investigations using quantum theory of atoms in molecules (QTAIM) revealed that XC adsorption onto Spt was due to hydrogen bonding (HB), partial and non-covalent interactions, whereas that onto Py was due to partial covalent and non-covalent interactions. Additionally and in general, the adsorption of XC onto the minerals was due to the shift of electrons from the polysaccharide to mineral surface species. Flotation studies conducted at pH 7.8 of Py-Spt (1:1) in presence of 20 g/t, 80 g/t and 60 g/t of sodium tripolyphosphate (SPP), XC and potassium amyl xanthate (PAX) yielded Py grade and separation efficiency of 98.7 % and 97.8 %, respectively, at an economical cost. Therefore, XC is a potential depressant for Spt.

中文翻译:


使用油菜黄单胞菌作为新型选择性蛇纹石抑制剂对蛇纹石和黄铁矿浮选表面化学性质的新见解:实验和 DFT 研究



使用油菜黄酮 (XC) 作为新型 Spt 抑制剂研究了黄铁矿 (Py) 与蛇纹石 (Spt) 的浮选分离。观察到 XC 对 Spt 和 Py 的吸附随着 pH 值的增加而降低,证明 XC 带负电荷的羧酸盐部分之间的排斥力增加,矿物表面的负性增加。然而,由于 Spt 的等电点 (IEP) 高于 Py,因此 Spt 对 Py 的多糖吸附小于对 Spt 的吸附。此外,使用分子中原子的量子理论 (QTAIM) 的理论研究表明,XC 吸附到 Spt 上是由于氢键 (HB)、部分和非共价相互作用,而 XC 吸附到 Py 上是由于部分共价和非共价相互作用。此外,一般来说,XC 吸附到矿物上是由于电子从多糖转移到矿物表面物种。在 pH 值为 7.8 的 Py-Spt (1:1) 下,在 20 g/t、80 g/t 和 60 g/t 的三聚磷酸钠 (SPP)、XC 和戊基黄原酸钾 (PAX) 的存在下进行浮选研究,以经济的成本得到 Py 品位和 97.8% 的分离效率分别为 98.7% 和 97.8%。因此,XC 是 Spt 的潜在抑制剂。
更新日期:2024-12-05
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