Novel strategies for CO2 utilization and storage in mineral processing

选矿过程中二氧化碳利用和封存的新策略

• 批准号: 521366-2018
• 负责人: Bobicki, Erin
• 金额: $ 8.03万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Strategic Projects - Group
• 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=697771
• 关键词: Novel; strategies; CO2; utilization; storage

Mineral carbon storage (MCS) is a type of carbon sequestration where carbon dioxide is reacted with alkaline minerals to form solid carbonates. Although MCS has advantages compared to other carbon storage techniques, it requires large quantities of mineral feedstock. The acquisition of this mineral feedstock through mining can have a large environmental footprint. Mineral processing wastes are an alternative source of MCS feedstock which are already mined and finely ground. In this project, we propose to develop an integrated process to simultaneously store carbon dioxide, improve the efficiency of mineral processing operations, enhance tailings stability and eliminate waste. Specifically, we plan to investigate (1) the impact of active mineral carbonation on the flotation of ultramafic nickel ores, (2) explore the use of CO2 as a flotation gas to precipitate magnesium and calcium ions and condition process water while simultaneously storing carbon, (3) study the use of mineral carbonation to generate cementitious materials in ultramafic nickel tailings to enhance tailings management by dry-stack, and (4) examine the potential for mineral carbonation to transform ultramafic tailings into valuable commodities and eliminate the production of waste materials. If successful, new technologies will be developed that not only increase the sustainability of mining and mineral processing operations, but also generate new streams of revenue through the storage of carbon and sale of new products, and could make previously uneconomic mining operations feasible. These outcomes are important for Canadian mining companies, who urgently need to develop new technologies to process low-grade ores and manage tailings, as well as for Canadians in general who benefit from employment in the mining sector. Additional benefits include climate change mitigation and reduced impacts of mining and mineral processing on lands and water.

矿物碳储存（MCS）是一种碳封存，其中二氧化碳与碱性矿物反应形成固体碳酸盐。虽然MCS与其他碳储存技术相比具有优势，但它需要大量的矿物原料。通过采矿获得这种矿物原料可能会产生很大的环境足迹。矿物加工废物是已经开采和精细研磨的监控监原料的替代来源。在该项目中，我们建议开发一种综合工艺，以同时储存二氧化碳，提高选矿作业效率，提高尾矿稳定性并消除浪费。具体而言，我们计划研究（1）活性矿物碳酸化对超镁铁镍矿浮选的影响，（2）探索使用CO2作为浮选气体沉淀镁和钙离子并调节工艺用水，同时储存碳，（3）研究使用矿物碳酸化在超镁铁镍尾矿中产生胶结材料，以通过干堆加强尾矿管理，以及（4）研究矿物碳酸化将超镁铁尾矿转化为有价值的商品并消除废料产生的潜力。如果成功，将开发新技术，不仅提高采矿和矿物加工业务的可持续性，而且通过碳储存和新产品的销售产生新的收入流，并使以前不经济的采矿业务可行。这些成果对加拿大矿业公司非常重要，因为它们迫切需要开发新技术来加工低品位矿石和管理尾矿，对受益于采矿业就业的加拿大人也非常重要。其他惠益包括减缓气候变化以及减少采矿和矿物加工对土地和水的影响。