Catalogue of South African mine tailings for geochemical carbon dioxide removal purposes
Catalogue of South African mine tailings for geochemical carbon dioxide removal purposes
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DOI：
10.1016/j.ijggc.2023.103844
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发表时间：
2023-01-30
影响因子：
3.9
通讯作者：
Amponsah-Dacosta，Maxwell
中科院分区：
文献类型：
--
作者：
Bullock，Liam A.;Nkosi，Zakhele;Amponsah-Dacosta，Maxwell
南非有潜力成为实施利用矿山尾矿、利用碱化生产方法和矿物碳化的地球化学二氧化碳清除（CDR）战略的全球领导者。这是由于每年从钻石、PGM、铬、镍、磷酸盐、铜、滑石和菱镁矿开采基性和超基性岩石产生数亿吨地球化学和矿物学上合适的尾矿。这一办法可能为南非实现排放抵消和减排目标提供另一条途径。在这里，已编制了一份尾矿目录，以突出国家全面的尾矿回收潜力，并提请注意试点计划的地点机会。根据体积地球化学和收缩岩心模型的计算，南非所有合适的地点每年平均有1.1-1.7亿吨二氧化碳的去除能力，而通过风化历史尾矿可以去除额外的11-17亿吨二氧化碳。在2030-2100年期间，考虑到所有可用于天气的年生产尾矿，可实现的总CDR为79- 1.19亿吨二氧化碳。如果考虑生产信息有限的矿山，并包括2017年前的尾矿产量、废弃库存和其他工业副产品，则产能可能更高。钻石矿拥有最高的地球化学CDR能力，以及Phalaborwa、Nkomati和mogalakweena金属矿山的高尾矿生产商。学术界、工业界和政策制定者有动力在未来几年修订矿区的地球化学CDR潜力，其他国家也有动力对本国合适的尾矿和地球化学CDR潜力进行分类，以备未来的大规模机会。
South Africa has the potential to be a global leader in implementing strategies targeting geochemical carbon dioxide removal (CDR) using mine tailings, utilising methods for alkalinity production and mineral carbonation. This is due to the hundreds of millions of tonnes of geochemically and mineralogically suitable tailings produced annually from diamond, PGM, chrome, nickel, phosphate, copper, talc and magnesite mines, exploiting mafic and ultramafic rocks. This approach may offer an additional route towards emissions offsets and reduction targets for South Africa.Here, a catalogue of tailings has been developed to highlight overall national CDR potential, drawing attention to site opportunities for pilot schemes. It has been calculated, using bulk geochemistry and shrinking core modelling, that South Africa has an average 1.1-1.7 MtCO2removal capacity per year across all suitable sites, while an additional 11-17 MtCO2could be removed through weathering historic tailings. The total CDR that could be achieved over the 2030-2100 period, considering all annually produced tailings available to weather, is 79-119 MtCO2. The capacity may be higher if mines of limited production information are considered, and pre-2017 tailings production amounts, abandoned stockpiles, and other industrial by-products are included. Diamond mines hold the highest geochemical CDR capacities, along with high tailings producers in Phalaborwa, Nkomati and Mogalakwena metal mines. There are incentives for academia, industry and policymakers to revise the geochemical CDR potential of mine sites in the years to come, and for other countries to catalogue their own suitable tailings and geochemical CDR potential capacities for future Mt-scale opportunities.