钙离子对脂肪酸类捕收剂浮选石英的影响机理

为了探究脂肪酸类捕收剂在浮选石英过程中，钙离子活化石英的作用及机理，进行了浮选试验、动电位检测、红外光谱分析.结果显示石英被浮选需要钙离子的活化，钙离子能增加石英的表面动电位，以及改性脂肪酸捕收剂DWD-3能在被钙离子活化的石英表面发生吸附，且存在化学吸附、氢键吸附;量子力学模拟显示，Ca²⁺，Ca(OH)⁺，OH^-能在石英表面发生吸附，且Ca²⁺吸附作用最强，钙离子活化石英的过程是Ca²⁺优先在石英表面上的O处发生化学吸附，形成被Ca²⁺活化的表面，捕收剂DWD-3以单键氧O_Ⅰ与2个双键O_Ⅱ吸附在被活化的石英表面.

Effects and Activation Mechanism of Calcium Ion on the Flotation of Quartz with Fatty Acid Collector

To investigate the effects and activation mechanism of calcium ion on quartz in the flotation process with fatty acid collector， flotation tests， Zeta potential measurements and infrared spectroscopy analysis were applied. The results showed that flotation of quartz requires the activation of calcium ions， and calcium ions can increase the surface zeta potential of the quartz and the modified fatty acid collector DWD-3 can be adsorbed on the surface of the activated quartz through chemical and hydrogen bonding adsorption. The results of quantum mechanics simulation indicated that Ca²⁺， Ca(OH)⁺ and OH^-ions can all adsorbe on the quartz surface， and Ca²⁺ ion adsorption is the strongest. The process of Ca²⁺ion activation is that Ca²⁺ preferentially adsorbs on the O position of the quartz surface by chemical adsorption， forming a surface activated by Ca²⁺， then a single-bond oxygen (O_Ⅰ) and two double-bond oxygen (O_Ⅱ) of the collector DWD-3 adsorbe on the activated quartz surface by chemical and hydrogen bond adsorption.