金尾矿固化氯离子的机理研究

以火山灰质金尾矿为原材料，通过机械力活化和复合活化工艺（将机械力活化后的金尾矿进行热活化）激发尾矿硅铝活性，采用XRD、SEM、FT-IR测试手段测试水化产物，分析了胶凝材料水化机理及其对氯离子的固化机理。试验结果表明:由粉磨60 min再经750℃热活化1 h的金尾矿粉组成的胶凝材料固氯效果良好，胶砂块力学性能更加优异，活性尾矿粉的掺入促进了铝酸三钙（C₃A）、铁铝酸四钙（C₄AF）等矿物与氯离子化学结合生成Friedel盐的能力，同时掺入复合活化金尾矿粉的试样中有更多能吸附氯离子的硅酸钙凝胶（C-S-H）和钙矾石（AFt）产物，试样密实度提高的同时其固化氯离子的能力也提升。 

Study on the Curing Mechanism of Chloride Ions from Gold Tailings

Using the pozzolanic gold tailings as the main raw materials, mechanical grinding and chemical activations were used to stimulate the pozzolanic activity of gold tailings, where the gold tailings are treated by mechanical activation and then thermal activation). Hydration mechanism of cementing material and its curing mechanism of chloride ions are analyzed by X-ray diffraction analysis (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM). The results show that the gold tailings treated at the conditions of grinding 60 min and heating 750℃, has a favorable effect of chlorine fixation and mechanical properties. The highly active tailings promote the C₃A, C₄AF to combine with chlorine ions and produce more Friedel salt. In addition, more C-S-H gels and ettringite (AFt) hydration products appear with the addition of active tailings, which makes the structure of the hardened slurry dense and have good chlorine retention ability.