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首页> 外文会议>International Conference on Copper 2003-Cobre 2003 v.6 book 1; 20031130-20031203; Santiago; CL >An experimental study of the interaction of malachite, atacamite and chrysocolla with a reactive gangue during sulphuric acid leaching
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An experimental study of the interaction of malachite, atacamite and chrysocolla with a reactive gangue during sulphuric acid leaching

机译：硫酸浸出过程中孔雀石，方解石和温石棉与活性脉石相互作用的实验研究

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摘要

The chemical interactions between some copper minerals and a potentially reactive gangue during a sulphuric acid column leaching have been studied on a laboratory scale. To ensure that the feed material had the desired composition, an artificial rock aggregate was prepared, containing 57% short-term acid inert quartz, 42% reactive gangue (4 smectites, 2 kaolins, 1 illite, 1 zeolite) and 1% copper mineral phase (atacamite, chrysocolla, malachite). Overall, the copper recovery in the leachate depends on the gangue composition, although the absolute values depend on the type of mineral phase (carbonate, chloride, silicate). A cavity formation in the middle of the column was a typical feature of all the smectites in their maximum expanded state. The de-lamination of kaolin sheets and the consequent physical barrier formation create an initial acid accumulation at the column top. Partial dissolution of smectites and illites was observed. The presence of major elements in the leachates reflects the cation availability in the free exchange positions or easy dissolved aluminium-silicate framework sites. Cu-cation exchange capacities increase in residues due to the Cu-entry in the exchange positions and the presence of residual Cu.
机译：已经在实验室规模上研究了硫酸铜柱浸出过程中某些铜矿物质和潜在的活性脉石之间的化学相互作用。为确保进料具有所需的组成，制备了人造岩石骨料，其中包含57％的短期酸惰性石英，42％的活性石（4种绿土，2种高岭土，1种伊利石，1种沸石）和1％的铜矿物质相（硫铁矿，金雀石，孔雀石）。总体而言，尽管绝对值取决于矿物相的类型（碳酸盐，氯化物，硅酸盐），但渗滤液中的铜回收率取决于脉石成分。柱中间的空洞形成是所有蒙脱石处于最大膨胀状态时的典型特征。高岭土板的分层和随之形成的物理屏障形成了在塔顶的初始酸积累。观察到蒙皂石和伊利石的部分溶解。渗滤液中主要元素的存在反映了在自由交换位置或易溶解的铝硅酸盐骨架部位的阳离子可用性。由于交换位置中的铜进入和残留铜的存在，残留物中的铜阳离子交换容量增加。

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