In this study, the adaptability of gold-containing tailings to microwave chlorination roasting was investigated. The refractory characteristics of tailings were tested by diagnostic roasting method. Thermochemical treatment was conducted in different temperature regions to destroy the target mineral. At each roasting stage, the roasted tailings were analysed and characterised by atomic absorption spectroscopy (AAS) and X-ray diffraction (XRD) to retrieve the gold recovery rate, chlorine loss rate, oxidation characteristics, and grain size of the tailings before and after roasting to predict the gold content in different carriers. The contents of gold in combination of natural gold and bare inclusion, the vein gold state and locked gold state are 22.09%, 36.48% and 41.43%.

The results of roasting diagnosis showed that the difference in recovery rate between microwave roasting and conventional roasting is mainly due to the difference in the amount of gold recovered from locked gold. After thermochemical treatment at 1173 K, recovery 26.73% of gold from locked gold state by microwave roasting, and recovery 1.43% of gold from locked gold state by conventional roasting. The microwave effectiveness of recycling gold from locked gold was 17.69 times higher than that of conventional methods. This study provides theoretical support for the industrialisation of the microwave heat treatment of gold-containing tailings on the basis of process mineralogy.

在这项研究中，研究了含金尾矿对微波氯化焙烧的适应性。通过诊断焙烧法测试了尾矿的耐火特性。在不同温度区域进行热化学处理以破坏目标矿物。在每个焙烧阶段，通过原子吸收光谱法（AAS）和X射线衍射（XRD）对焙烧的尾矿进行分析和表征，以检索金回收率，氯损失率，氧化特性以及尾矿前后的粒度焙烧以预测不同载体中的含金量。天然金与裸露夹杂物，脉状金态和锁金态的金含量分别为22.09％，36.48％和41.43％。

烘焙诊断结果表明，微波烘焙与常规烘焙之间的回收率差异主要是由于从锁金中回收的金量不同。在1173 K进行热化学处理后，通过微波焙烧从锁定金态回收26.73％的金，通过常规焙烧从锁定金态回收1.43％的金。从锁定金中回收金的微波效率是传统方法的17.69倍。该研究为基于工艺矿物学的含金尾矿的微波热处理产业化提供了理论支持。