Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia
Mineralogy and Pretreatment of a Refractory Gold Deposit in Zambia
复制标题
赞比亚难熔金矿的矿物学和预处理
作者：
Wang Xu;Qin Wenqing;Jiao Fen;Yang Congren;Cui Yanfang;Li Wei;Zhang Zhengquan;Song Hao
采用X射线荧光光谱（XRF）、X射线衍射光谱（XRD）和扫描电镜（SEM）对赞比亚西北省某金存款矿床进行了工艺矿物学研究。结果表明，金以自然金和银金矿的形式高度分散于黄铁矿、毒砂和某些脉石等载金矿物中。矿石中金品位为15.96 g/t，金的粒度分布极不均匀。大多数金颗粒小于10 μm，并被含金矿物包裹，在研磨过程中难以实现解离。针对某难处理存款矿床的特点，采用重-浮联合浮选工艺回收硫化矿中游离的粗粒金和细粒金。闭路实验取得了良好的指标。重选精矿金的品位和回收率分别达到91.24g/t和57.58%。浮选精矿金品位为49.44g/t，回收率为33.36%。金的总回收率为90.94%。重-浮联合浮选预处理工艺为该难处理金矿石提供了一种可行的方法，保证了金的有效回收。
The technological mineralogy of a gold deposit located in North-Western province of Zambia was carried out by using X-ray fluorescence spectroscopy (XRF), X-ray diffraction spectroscopy (XRD), and scanning electron microscope (SEM). The results showed that gold was highly dispersed in gold-bearing minerals such as pyrite, arsenopyrite, and some gangues in the form of natural gold and electrum. The gold grade in the mineral was 15.96 g/t and the particle size distribution of gold was extremely uneven. Most of the gold particles were less than 10 μm and wrapped with gold-bearing minerals, making it difficult to achieve liberation during grinding. According to the characteristics of the refractory gold deposit, the gravity–flotation combined beneficiation process was used to recover the liberated coarse gold and the fine gold in the sulphides. The closed-circuit experiments obtained excellent indicators. The grade and recovery of gold in the gravity separation concentrates reached 91.24 g/t and 57.58%, respectively. The grade and recovery of gold in the flotation concentrates were 49.44 g/t and 33.36%, respectively. The total recovery of gold was 90.94%. The gravity–flotation combined beneficiation pretreatment process provided a feasible method for the refractory gold ore and ensured the effective recovery of gold.