云南二郎铜矿石工艺矿物学研究

Research on Process Mineralogy of the Erlang Copper Ore in Yunnan Province

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,+13.5μm粒级分布率为70.09%;砷钙铜矿集中分布在27~3.4μm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+38μm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 re- search 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 hypidiomor- phic-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 rea- sonable to recover the copper.