Towards industrial implementation of glycine-based leach and adsorption technologies for gold-copper ores
Towards industrial implementation of glycine-based leach and adsorption technologies for gold-copper ores
复制标题
金铜矿石甘氨酸浸出和吸附技术的工业化实施
DOI：
10.1080/00084433.2017.1391736
复制
发表时间：
2018
影响因子：
0.9
通讯作者：
I. Bryan
中科院分区：
文献类型：
--
作者：
J. Eksteen;E. Oraby;B. Tanda;P. Tauetsile;G. A. Bezuidenhout;T. Newton;F. Trask;I. Bryan
摘要使用碱性甘氨酸溶液从矿石、精矿和废料中选择性地浸出金、银和贱金属的技术，引起了人们对在各种环境中使用这项新技术的浓厚兴趣，如原地浸出、原地浸出、倾倒浸出、堆浸、还原浸出和搅拌槽浸出。研究表明，甘氨酸与许多其他浸出剂具有协同作用，可以降低其他浸出剂的净消耗量，同时允许低成本的甘氨酸溶液回收。甘氨酸是一种无毒、稳定、对环境无害的试剂，可大量用于工业生产。它具有溶解大多数氧化铜和硫化物矿物以及天然铜的能力，而不与耗酸的脉石相互作用，也不溶解铁和各种或无处不在的脉石元素。它与少量氰化物协同作用，以高于甘氨酸或氰化物本身的浸出率浸出金铜矿，同时显著减少氰化物消耗并消除解毒要求。对各种甘氨酸体系的浸出行为进行了综述，并对活性碳对金的吸附性能进行了评价。在经济上有利的地方，可以很容易地通过溶剂提取或硫化物沉淀来回收铜。
ABSTRACT The technology to selectively leach gold, silver and base metals from ores, concentrates, and wastes, using an alkaline glycine solution, has initiated significant interest in using the new technology in various environments such as in situ, in-place, dump, heap, and vat and agitated tank leaching. It has been shown that glycine acts synergistically with a number of other lixiviants to lower the net consumption of the other lixiviants while allowing low-cost glycine solution recovery. Glycine is a non-toxic, stable, environmentally benign reagent that is available in bulk industrial quantities. It has the ability to dissolve most copper oxide and sulphide minerals, as well as native copper, whilst not interacting with acid-consuming gangue nor dissolving iron and various or ubiquitous gangue elements. It acts synergistically with small amounts of cyanide to leach gold-copper ores at leach rates higher than either glycine or cyanide on their own, while significantly reducing cyanide consumption and eliminating detoxification requirements. The leaching behaviour of various glycine-based systems will be reviewed, followed by the evaluation of the adsorption of gold onto activated carbon. Where the economics merit it, copper can be easily recovered using solvent extraction or sulphide precipitation.