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宏观性疏水性矿石石棉的水性修饰及其在漂浮中的特定应用

Zechao Huangfu¹, Wei Sun¹, Hongliang Zhang¹

¹School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, China.

Langmuir : the ACS journal of surfaces and colloids

|November 21, 2024

概括

二甲基二甲基碳酸盐 (DDTC) 意外地降低了滑石粉的疏水性. 这是因为DDTC造成的.

科学领域:

表面化学表面化学
矿物加工矿物加工
计算化学计算化学

背景情况:

二甲基二甲基碳酸盐 (DDTC) 是一种用于泡漂浮的收集剂,用于增加矿物质的疏水性.
滑石表面的疏水性被DDTC意外削弱,这与其典型的功能相反.

研究的目的:

研究DDTC,水和滑石表面的相互作用,以解释观察到的疏水性异常.
为了阐明DDTC在塔尔克 (001) 表面上的吸附机制.

主要方法:

密度函数理论 (DFT) 模拟用于模拟表面相互作用.
吸附异热和接触角度测量.
飞行时间二次离子质谱 (ToF-SIMS) 和微浮试验.

主要成果:

DFT模拟显示,DDTC的疏水性基组优先与滑石面相互作用,而不是水友性矿物友性群 (-NCS2-) 和水.
实验结果证实,DDTC增强了滑石面的水友性,导致滑石的回收减少.
DDTC的吸附方向决定了它对滑石面性能的影响.

结论:

该研究提供了表面化学证据,证明DDTC等异极表面活性剂的选择性吸附.
了解DDTC的相互作用机制对于优化浮动分离化与石至关重要.

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