Atmospheric oxidation of pyrite; maximizing the elemental sulphur yield

黄铁矿的大气氧化；

• 批准号: 469802-2014
• 负责人: Ghahremaninezhad, Ahmad
• 金额: $ 4.23万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=577468
• 关键词: Atmospheric; oxidation; pyrite; maximizing; elemental

This research proposal is about atmospheric pre-treatment and gold recovery of pyrite-refractory ores. The typical method for gold extraction from simple ores is to leach the ore in a dilute cyanide solution. Leaching of the refractory gold ores is more complex than simple ores. Typically, the refractoriness of the gold ores is due to the presence of sulphides, such as pyrite (FeS2). In the refractory ores, fine gold particles are usually encapsulated in the sulphide matrix and are inaccessible to cyanide solution, resulting in poor gold recoveries. Treatment of the refractory gold ores requires one additional step in the process, known as oxidative pre-treatment, to decompose the sulphide structure and liberate the encapsulated gold particles. However, sulphides such as pyrite, are very stable and their decomposition requires strong oxidizing conditions. Roasting and pressure oxidation are two commercially-proven technologies for oxidation of sulphides. However, building a new plant based on these processes can be extremely costly. Additionally, if the feed ore contains penalty elements, such as arsenic, then the roasting process may release these into the environment. Penalty elements are highly toxic and the risk of their release into the environment limits the roasting process application. This proposal will investigate an atmospheric leaching method for pyrite oxidation. The goal is to develop a process with high oxidation kinetics and high elemental sulphur yield. The kinetics of the process should be high to make the economics of the processes justifiable. The high oxidation kinetics will be obtained by application of carbon based catalysts in the process. High yield of elemental sulphur is also important to achieve, in order to eliminate excess sulphuric acid generation. Gold leaching of the oxidized material would be performed in thiosulphate solution by the recently commercialized process by Barrick Gold Corp. Six HQPs (2 PhD and 4 summer students) will be engaged in this project, and will gain extensive knowledge of the extractive metallurgy. The HQPs will be trained to meet the needs of the Canadian mining industry.

该研究建议是关于黄铁矿 - 饮食矿石的大气预处理和黄金恢复。这 从简单矿石中提取黄金的典型方法是将矿石浸入稀氰化物溶液中。浸出 耐火金矿比简单的矿石更复杂。通常，金矿石的耐火 存在硫化物，例如黄铁矿（FES2）。在难治性矿石中，细金颗粒通常是 封装在硫化物基质中，无法用氰化物溶液访问，导致金回收率差。 在此过程中需要额外的一步，称为氧化 预处理，分解硫化物结构并释放包裹的金颗粒。然而， 硫化物（例如黄铁矿）非常稳定，它们的分解需要强大的氧化条件。烤 压力氧化是两种用于硫化物氧化的商业化技术。然而， 基于这些过程的新工厂建立新工厂可能非常昂贵。此外，如果饲料矿石包含 诸如砷之类的惩罚因素，然后烘焙过程可能会将其释放到环境中。惩罚 元素有剧毒，释放到环境的风险限制了烘焙过程 应用。 该建议将研究一种大气浸出方法用于黄铁矿氧化。目标是开发 具有高氧化动力学和高元素硫产量的过程。该过程的动力学应该是 高高使过程的经济学合理。高氧化动力学将通过 在此过程中应用碳催化剂。元素硫的高收率对于 实现，以消除过量的硫酸产生。氧化材料的黄金浸出将 由Barrick Gold Corp.最近商业化的过程在硫代硫酸盐溶液中进行。 六个HQP（2个博士学位和4个夏季学生）将参与该项目，并将获得广泛的知识 提取冶金。 HQP将接受培训以满足加拿大采矿业的需求。