Corrosion and stress corrosion cracking behavior of alloys in solutions relevant to gold thiosulfate leaching technology

硫代硫酸金浸出技术相关溶液中合金的腐蚀和应力腐蚀开裂行为

• 批准号: 437892-2012
• 负责人: Alfantazi, Akram
• 金额: $ 5.1万
• 依托单位: University of British Columbia
• 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=553170
• 关键词: Corrosion; stress; corrosion; cracking; behavior

Hydrometallurgical processes for metal extraction deal with waste solution treatment and significant research isdedicated to improving the processes in terms of environmental issues. Gold hydrometallurgical extraction is currentlybeing performed bycyanide leaching. Due to personnel safetyand environmental issues, there is significant interest for replacing the cyanide leaching agent with thiosulfate. Barrick Gold Corporation is interested in developing the new leaching agent for their cyanide gold leaching process. The assessment of corrosion behavior of materials in concentrated thiosulfate solutions is an obstacle since no previous studyhas been performed in this medium. The overall objective of this proposal is to provide data on corrosion behavior of construction materials in thiosulfate solutions relevant to gold leaching. The final practical goal will be to decide on the alloys with the best performance in terms of chemical stabilityand stress corrosion cracking. In fundamental level, this will appreciablycontribute to the corrosion science since there is no data on corrosion behavior in concentrated thiosulfate solutions. This is particularlyimportant because of 1) interactions of thiosulfate with the surface leading to generation of sulfur and consequentlypromoting stress corrosion cracking; and 2) solution chemistryand the complications resulting from buffering capacityof thiosulfate. The innovative electrochemical techniques to be used in this studywill contribute to close the corrosion science gap in this particular environment.A PhD student, a post doctoral fellow and four summer students will be trained in this research project. This studywill help understanding the corrosion phenomenon in highlyconcentrated thiosulfate solutions. It will greatlyhelp deciding the best construction materials for this medium, which will finallyaccelerate the transition from the current cyanide-based leaching plants to more environmentally-friendlythiosulfate plants.

金属提取的水态铝过程处理废物溶液处理，并且在环境问题方面改善过程的大量研究。当前正在执行的金透明化铝萃取。由于人员安全和环境问题，对用硫代硫酸盐代替氰化物浸出剂的兴趣很大。巴里克·金公司（Barrick Gold Corporation）有兴趣为其氰化物浸出过程开发新的浸出剂。浓缩硫代硫酸盐溶液中材料腐蚀行为的评估是一个障碍，因为以前没有在该媒介中进行研究。该提案的总体目的是提供有关与黄金浸出有关的硫代硫酸盐溶液中建筑材料腐蚀行为的数据。最终的实际目标是在化学稳定性和应力腐蚀破裂方面决定具有最佳性能的合金。在基本层面上，这将明显地归因于腐蚀科学，因为没有关于浓缩硫代硫酸盐溶液中腐蚀行为的数据。这特别重要，因为1）硫代硫酸盐与表面的相互作用，导致硫的产生，从而促进应激腐蚀裂纹； 2）溶液化学和硫代硫酸盐缓冲能力产生的并发症。本研究中使用的创新电化学技术将有助于在此特定环境中缩小腐蚀科学差距。这项研究将有助于理解高度浓缩的硫代硫酸盐溶液中的腐蚀现象。它将极大地决定该媒介的最佳建筑材料，这将最终从当前的基于氰化物的浸出植物到更环保的硫酸盐植物。