云南二郎铜矿石工艺矿物学研究

摘要

为给云南二郎铜矿资源合理开发利用提供依据,对矿石进行了工艺矿物学研究.结果表明:该矿石原岩由岩屑角砾岩、岩屑杂砂岩、变质岩屑石英砂岩等组成,主要结构为填隙结构、他形粒状结构矿石;主要构造为稠密浸染状构造、稀疏-星散浸染状构造.矿石中主要目的元素铜品位为1.72％,矿石中的铜主要为游离氧化铜,占总铜的89.89％,结合氧化铜占总铜的5.85％;铜矿物主要是孔雀石(蓝铜矿)、砷钙铜矿、含铜褐铁矿、假孔雀石;脉石矿物主要为石英、白云母、方解石.矿石中的孔雀石(蓝铜矿)多数呈半自形-他形粒状嵌布于脉石矿物中,+13.5 μm粒级分布率为70.09％;砷钙铜矿集中分布在27 ～ 3.4 μm粒级,累计分布率达88.85％;含铜褐铁矿的嵌布特征较复杂,部分以粗粒单体形式存在,粒度主要集中分布在+38 μm粒级,累计分布率达71.61％.根据该矿石的工艺矿物学特征,宜采用酸浸工艺回收该铜资源.%In order to reasonably and efficiently develop and utilize the Erlang copper ore from Yunnan Provence,the research on process mineralogy of the ore was investigated.The results show that the run-of-mine ore is comprised of cuttings breccia,lithic greywacke,metamorphic rock debris quartz sandstone and others;The ores are in interstitial or xenomorphic grain-like texture,and are densely or scattered-sparsely disseminated in structure.The copper grade of main element in the ores is 1.72％,and the copper is mainly free copper oxides with distribution rate of copper of 89.89％.The distribution rates of combined copper oxide is 5.85％;Copper minerals are mainly Malachite (Azurite),Conichalcite,copper-containing limonite,and Pseudomalachite;Gangue minerals are mainly quartz,muscovite and calcite.Most of Malachite (Azurite) with hypidiomorphic-allotriomorphic structure are granularly embedded in gangue minerals,and its particle size is mainly distributed in +13.5 μm (accounted for 70.09％);Conichalcite are evenly distributed from 27 to 3.4 μm accounted for 88.85 ％.Copper-containing limonite has a complicated embedding feature,and part of them are in form of coarse-grained monomer mainly distributed in + 38 μm(accounted for 71.61％).According to the process mineralogy of the ore,the acid leaching process may be more reasonable to recover the copper.