Arsenic and antimony immobilization from mineral processing solutions and waste waters

矿物加工溶液和废水中砷和锑的固定化

• 批准号: RGPIN-2015-05718
• 负责人: Ghahreman, Ahmad
• 金额: $ 1.82万
• 依托单位: Queen's University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708671
• 关键词: Arsenic; antimony; immobilization; mineral; processing; Arsenic; antimony; immobilization; mineral; processing

The increased extraction of mineral resources and mining activities have added pressure on the environment, therefore it is imperative that proper processes for water/waste management are developed. Arsenic and antimony are among the toxic elements which are usually released into the environment from mining activities. The mining operations at the Giant Mine gold mine in the Northwest Territories, which was operated from 1948 to 2004, have created 237,000 tonnes of arsenic trioxide dust. Arsenic trioxide is soluble in water and has contaminated soil and buildings in the surrounding area. In another case, arsenic concentrations of up 100 mg/L were detected in the tailing porewater (underground water) of Campbell Mine, Balmertown, ON. This arsenic level is 10,000 times higher than the maximum acceptable arsenic level by Canadian drinking water quality standard, which is 0.010 mg/L. As high grade and clean deposits are becoming more difficult to find, there is a need for the development of processes to extract complex arsenic and antimony-containing orebodies, minerals and metals in a safer, more environmentally sustainable manner. This is essential for the continued financial sustainability of the Canadian mining industry, the largest employer of the Canadian economy. Processing of complex orebodies is not possible without further development of robust solutions for the management of toxic elements. There is a need for development of processes that can immobilize (precipitate) the toxic elements as safe, non-toxic and stable compounds. In particular, the precipitates must have long term environmental stability for thousands of years. The applicant proposes to establish a research program to study the arsenic and antimony immobilization processes. The long-term goals of this research program are to develop a comprehensive understanding of the chemistry of the two elements in the mining processes, and the long-term stability of the arsenic and antimony-containing precipitates in the environment. During the next five years, i.e. short-term objectives, it is proposed to generate a solid knowledge of the arsenic and antimony oxidation mechanisms, investigate the feasibility of arsenic immobilization through sustainable bio-oxidation and bio-precipitation processes, develop a reliable protocol for long-term stability assessment of arsenic and antimony precipitates, and generate a global list of most stable arsenic and antimony compounds/precipitates, to be used as a reference document for process selection/development by the mining industry. It is expected that the knowledge, and HQP developed through this research program will be highly sought after by the Canadian mining industry. Two Ph.D. students and two Master's students will be trained through the first 5-year round of this research program.

矿产资源和采矿活动的提取增加增加了对环境的压力，因此必须开发适当的水/废物管理过程。砷和锑是通常从采矿活动中释放到环境中的有毒元素之一。从1948年到2004年运营的西北地区巨型矿山矿山的采矿业务创造了237,000吨砷三氧化物粉尘。三氧化砷可溶于水，并在周围地区污染了土壤和建筑物。在另一种情况下，在ON的Balmertown的坎贝尔矿的尾孔（地下水）中检测到砷浓度增加100 mg/l。该砷水平比加拿大饮用水质量标准标准（（0.010 mg/l）高的最大可接受砷水平高10,000倍。 随着高级和清洁沉积物变得越来越困难，需要开发工艺来提取复杂的砷和含量的矿物质，矿物质和金属，以更安全，更环保的方式。这对于加拿大矿业行业的持续财务可持续性是至关重要的，加拿大矿业行业是加拿大经济的最大雇主。如果没有进一步开发有毒元素管理的强大解决方案，就不可能处理复杂的矿体。需要开发可以将有毒元素固定为安全，无毒和稳定化合物的过程。特别是，沉淀物必须具有长期的环境稳定性数千年。 申请人建议建立一项研究计划，以研究砷和锑固定过程。该研究计划的长期目标是对采矿过程中这两个要素的化学反应以及环境中砷和锑沉淀的长期稳定性进行全面了解。在接下来的五年（即短期目标）中，提议对砷和锑氧化机制产生可靠的知识，研究砷通过可持续的生物氧化和生物实现过程的可靠性，并为长期稳定的危险和反态稳定的评估提供可靠的规程，并为大多数抗抗病性和抗议物的稳定性评估，并建立了抗态性，并构成了大多数抗议的态度，并构成了抗态性的敏捷性，并构成了抗态性的敏捷，并构成了抗原症的稳定，并构成了抗态性的稳定性，并构成了抗原态，并构成了抗原态，并构成了抗态性的态度，并建立了抗态的态度，并构成了生产量，并构成了生产力，并构成了生产力的态度，并化合物/沉淀物，被用作采矿行业的过程选择/开发的参考文献。预计通过该研究计划开发的知识和HQP将受到加拿大采矿业的高度追捧。两位博士学生和两个硕士学生将在该研究计划的第一个5年回合中接受培训。