难处理高结合率氧化铜矿选冶联合工艺研究

采用选冶联合工艺对含铜1.53％、氧化率47.06％、结合率21.57％的高结合率氧化铜矿进行回收.原矿的砂光片分析结果表明,矿石中大部分铜矿物嵌布粒度极细,多呈星点状和不均匀浸染状分布,与硅、钙、镁、铝等脉石共生严重,导致浮游性较差.针对该矿石的特点,研究了工艺参数及流程结构对指标的影响,确定了“三次粗选—粗精矿再磨—三次精选”的硫化浮选工艺流程,获得了含铜品位为23.43％、回收率为53.72％的铜精矿.对尾矿的形貌及矿物组成表征发现：铜矿物呈细粒浸染状或被硅酸盐矿物包裹,导致这部分铜损失在尾矿中.在最佳的酸浸工艺条件下,对浮选尾矿进行酸浸试验,获得了相对原矿的浸出率为33.21％的试验指标;铜综合回收率为86.93％.

Copper Recovery from a Refractory and High Combination Rate Copper Oxide Ore Using a Combined Process of Beneficiation and Metallurgy

A high combination rate copper oxide ore is processed by a combined process with beneficiation and metallurgy, which contains 1.53% copper with an oxidation rate of 47.06% and a combination rate of 21.57%. Polished section identification and analysis of the ore show that most copper minerals exist in the ore with fine grain size, distribute stellately, disseminate unevenly and coexist with silicon, calcium, magnesium, aluminum and other gangue seriously, which leads to poor floatability. According to the characteristics of the ore, the effect of the process parameters and structure on indicators is studied. A 23.43% grade of copper concentrate with a recovery of 53.72% is obtained by a sulphidizing flotation process including ＂three-stage roughing-crude concen- trate regrinding-three-stage cleaning＂. The morphology and mineral composition of the tailings are then charac- terized. It is found that fine-grained copper minerals present as dissemination or being encapsulated in silicate minerals, resulting in the partly loss of copper in tailings. Under the best acid leaching process conditions, the acid leaching experiment of the flotation tailings is conducted. A leaching rate of 33.21% is obtained relative to raw ore and the total copper recovery of the whole process is 86.93 %.