Immobilisation of chromium in magnesium carbonate minerals

IF 2.8 3区 地球科学 Q2 MINERALOGY
Alicja M. Lacinska, Keith Bateman, Simon Chenery, Simon J Kemp, Thomas Liddy, Jeremy C Rushton, Dipankar Saha, Sven L.M. Schroeder
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Abstract

Hexavalent chromium (Cr6+) is a toxic carcinogenic pollutant that might be released by the mining and processing of ultramafic rocks and nickel laterites and which requires permanent removal from the contaminated biosphere. Ultramafic material can also serve as a feedstock for the sequestration of CO2 resulting from the growth of new minerals, raising the intriguing proposition of integrated sequestration of both pollutants, CO2 and chromium, into magnesium carbonates. Such a synergistic process downstream of ore recovery and mineral processing could be an elegant proposition for more sustainable utilisation and management of the Earth's resources. We have therefore carried out an experimental and microanalytical study to investigate potentially suitable carbonate minerals. Uptake of chromium in carbonate phases was determined, followed by identification of the crystalline phases and characterisation of the local structural environment around the incorporated chromium centres. The results suggest that neither nesquehonite nor hydromagnesite have the structural capacity to incorporate Cr6+ or Cr3+ significantly at room temperature. We therefore propose that further research into this technology should focus on laboratory assessments of other phases, such as layered double hyroxides, that have a natural structural capacity to uptake both chromium and CO2.

铬在碳酸镁矿物中的固定化
六价铬(Cr6+)是一种有毒的致癌污染物,可能会在超基性岩和红土镍矿的开采和加工过程中释放出来,需要从受污染的生物圈中永久清除。超基性岩材料还可以作为一种原料,用于封存新矿物生长过程中产生的二氧化碳,这就提出了将二氧化碳和铬这两种污染物综合封存到碳酸镁中的有趣提议。这种在矿石回收和矿物加工下游的协同过程可能是一种更可持续地利用和管理地球资源的优雅提议。因此,我们开展了一项实验和微分析研究,以调查潜在的合适碳酸盐矿物。我们测定了碳酸盐相对铬的吸收,然后鉴定了晶体相,并描述了铬中心周围的局部结构环境。结果表明,无论是内沸石还是水镁石,都不具备在室温下大量吸收 Cr6+ 或 Cr3+ 的结构能力。因此,我们建议对该技术的进一步研究应侧重于对其他相(如层状双氧化物)的实验室评估,这些相具有吸收铬和二氧化碳的天然结构能力。
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来源期刊
Mineralogical Magazine
Mineralogical Magazine 地学-矿物学
CiteScore
4.00
自引率
25.90%
发文量
104
审稿时长
6-12 weeks
期刊介绍: Mineralogical Magazine is an international journal of mineral sciences which covers the fields of mineralogy, crystallography, geochemistry, petrology, environmental geology and economic geology. The journal has been published continuously since the founding of the Mineralogical Society of Great Britain and Ireland in 1876 and is a leading journal in its field.
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