Activation mechanisms of quartz flotation with calcium ions and cationic/anionic mixed collectors under alkalescent conditions
Activation mechanisms of quartz flotation with calcium ions and cationic/anionic mixed collectors under alkalescent conditions
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DOI：
10.1016/j.colsurfa.2021.127771
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
Li Wang;Guodong Wang;P. Ge;Wei Sun;Honghu Tang;Wenjihao Hu
中科院分区：
文献类型：
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作者：
Li Wang;Guodong Wang;P. Ge;Wei Sun;Honghu Tang;Wenjihao Hu
由于有效活化剂的泄漏，在弱碱性条件下石英的高效浮选仍然具有挑战性。在碱性条件下，采用Ca 2+和阴阳离子混合捕收剂对石英进行了高回收率的浮选，并对活化机理进行了系统的研究。微浮选实验结果表明，在pH值为9.0的条件下，5 × 10− 4 mol/L的CaCl 2、2.5 × 10− 4 mol/L的油酸钠（NaOL）和3.0 × 10− 5 mol/L的十二烷基胺（DDA）可使81.60%的石英得到浮选。而不加CaCl_2或仅加CaCl_2和NaOL时，石英的回收率低于10%。Zeta电位、红外光谱和X射线光电子能谱的研究结果表明，NaOL通过化学吸附吸附在钙活化的石英表面，DDA通过电中和作用增强石英表面的疏水性。原子力显微镜成像显示，Ca 2+可以吸附在石英补丁，这是随后的NaOL/DDA混合吸附。结果表明，在弱碱性pH条件下，CaCl 2能促进阳离子/阴离子混合捕收剂在石英表面的共吸附。
High-efficiency flotation of quartz under alkalescent conditions remains challenging owing to the leak of an effective activator. In this research, high quartz flotation recovery was achieved with Ca2+and cationic/anionic mixed collectors under alkalescency, while activation mechanisms were systematically investigated. Micro-flotation results indicated that 81.60% quartz were floated with 5 × 10−4mol/L of CaCl2, 2.5 × 10−4mol/L of sodium oleate (NaOL) and 3.0 × 10−5mol/L of Dodecylamine (DDA) at pH 9.0. However, under 10% of quartz were recovered without adding CaCl2or only using CaCl2and NaOL. Zeta potential, infrared spectroscopy and X-ray photoelectron spectroscopy results confirmed that NaOL adsorbed on calcium-activated quartz surface via chemisorption and DDA could enhance the hydrophobicity of quartz via charge neutralization. Atomic Force Microscope imaging and revealed that Ca2+could adsorb on quartz in patches, which was subsequently adsorbed with mixed NaOL/DDA. This outcome demonstrated that CaCl2could promote co-adsorption of cationic/anionic mixed collectors on quartz at mildly basic pH.