Study of the behaviour of Au in oxide ores during thiosulfate leaching

硫代硫酸盐浸出氧化矿石中Au行为的研究

基本信息

批准号：
434421-2012
负责人：
Lipkowski, Jacek
金额：
$ 3.31万
依托单位：
University of Guelph
依托单位国家：
加拿大
项目类别：
Collaborative Research and Development Grants
财政年份：
2014
资助国家：
加拿大
起止时间：
2014-01-01 至 2015-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=552680
关键词：
Study behaviour Au oxide ores

项目摘要

The objective of this project is to develop a novel methodology to investigate the interactions between thiosulfate, complex ore samples and Au to better understand the complex behaviour that occurs during the industrial process of Au extraction called leaching. A novel ring-Au disk-mineral electrode will be fabricated to study Au and mineral interactions in the presence of thiosulfate and to study thiosulfate interactions with both Au and the mineral surface. Electrochemical techniques will be employed to study the Au leaching kinetics as well as the rate of formation of a passive layer that impedes the leaching kinetics in the presence of different minerals. Spectroscopic techniques will then be employed to identify the nature of the passive layer responsible for limiting the Au leaching kinetics. Using this ring-disk electrode we will identify the mineral(s) responsible for increased thiosulfate oxidation and passive layer formation. This knowledge is essential for the development of the ore pretreatment methodology mitigating these effects and increasing the Au leaching kinetics. Several additives to the lixiviant solution that have been previously identified to enhance Au leaching will be investigated in order to comparatively determine the role of each additive in the presence of different minerals. The information sought in this project will be essential for assisting the Canadian Au industry, specifically Barrick Gold Inc in development of new environmentally-friendly Au extraction processes.

该项目的目的是开发一种新的方法，以研究硫代硫酸盐，复杂的矿石样品和AU之间的相互作用，以更好地理解在AU提取过程中称为浸出的工业过程中发生的复杂行为。将制造一种新型的环磁盘矿物电极，以研究硫代硫酸盐存在的AU和矿物质相互作用，并研究与Au和矿物表面的硫代硫酸盐相互作用。电化学技术将被用来研究AU浸出动力学以及被动层的形成速率，该动力学的速率阻碍了在不同矿物质的存在下阻碍浸出动力学的。然后，将采用光谱技术来确定负责限制AU浸出动力学的被动层的性质。使用此环盘电极，我们将确定负责增加硫代硫酸盐氧化和被动层形成的矿物。这些知识对于开发矿石预处理方法论至关重要，从而减轻这些作用并增加了浸出动力学。将研究以前已经确定以增强AU浸出的利用溶液中的几种添加剂，以相对确定每个添加剂在存在不同矿物质中的作用。该项目中寻求的信息对于协助加拿大非盟产业至关重要，特别是巴里克黄金公司（Barrick Gold Inc）开发了新的环保AU提取过程。