Use of Apatite for Chemical Stabilization of Subsurface Contaminants

Bostick, W.D.

doi:10.2172/820754

Cited by 3 publications

(1 citation statement)

References 70 publications

(141 reference statements)

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“…Calcium (meta-)autunite (Ca(UO2)2(PO4)2⋅nH2O) is the most common precipitate at PRBs because Ca 2+ is abundant in apatite minerals (Bostick et al, 2000). However, as autunite minerals can support a range of cations (e.g., H3O + , K + , Na + , NH 4+ , Ba 2+ , Cu 2+ , Mg 2+ , Mn 2+ ) the precipitation of other autunite phases has also been observed, particularly chernikovite [H3O(UO2)(PO4)⋅nH2O], saléeite [Mg(UO2)2(PO4)2⋅nH2O], and sodium autunite [Na(UO2)(PO4).nH2O] (Bostick et al, 2003;Mehta et al, 2014).…”

Section: The Autunite Family Of Mineralsmentioning

confidence: 99%

Mechanochemical synthesis of the copper autunites—a new route to remediation of potentially toxic elements

Kirk,

MacIver-Jones,

et al. 2023

Proceedings of the International Conference on Mine Closure

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This paper focusses on the potentially toxic elements (PTE), uranium (U) and arsenic (As), which are both of concern in many developing nations that have active mining histories. U and As are toxic and carcinogenic, with U also being radioactive. In some ex-mining sites where these two contaminants co-exist (e.g., at the South Terras Mine, UK and the Zoige deposit, China) the untreated mine tailings have weathered and formed secondary mineral phases such as metatorbernite (Cu(UO2)2(PO4)2.8H2O) and metazeunerite (Cu(UO2)2(AsO4)2.8H2O). These minerals (part of the autunite group) are highly stable phases, and their formation has thus acted as a natural remediation solution and prevented U and As contamination from migrating through the surrounding environment.In this research, we describe a novel method for the synthesis of metatorbernite and metazeunerite from laboratory reagents, which we suggest could be a promising treatment method for U-and As-containing mining wastes. The method we describe uses mechanochemical techniques, which eliminate the need for a solvent and is compatible with existing infrastructure in the mining industry (e.g. grinding and milling facilities). We discuss the method development and directions for future work, highlighting that the successful development of this technique could have significant societal impacts, particularly in developing regions with poor waste management. Our ultimate aim is to develop a sustainable remediation strategy that can be easily scaled up and applied to other hazardous solid wastes to markedly reduce latent environmental and health risks.

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Section: The Autunite Family Of Mineralsmentioning

confidence: 99%

Mechanochemical synthesis of the copper autunites—a new route to remediation of potentially toxic elements

Kirk,

MacIver-Jones,

et al. 2023

Proceedings of the International Conference on Mine Closure

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Sequestration of metals in active cap materials: A laboratory and numerical evaluation

Dixon

Knox

2012

Remediation Journal

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9Active capping involves the use of capping materials that react with sediment contaminants to 10 reduce their toxicity or bioavailability. Although several amendments have been proposed for use 11 in active capping systems, little is known about their long-term ability to sequester metals. 12Recent research has shown that the active amendment apatite has potential application for metals 13 contaminated sediments. The focus of this study was to evaluate the effectiveness of apatite in 14 the sequestration of metal contaminants through the use of short-term laboratory column studies 15 in conjunction with predictive, numerical modeling. A breakthrough column study was 16 conducted using North Carolina apatite as the active amendment. Under saturated conditions, a 17 spike solution containing elemental As, Cd, Co, Se, Pb, Zn, and a non-reactive tracer was injected 18 into the column. A sand column was tested under similar conditions as a control. Effluent water 19 samples were periodically collected from each column for chemical analysis. Relative to the non-20 reactive tracer, the breakthrough of each metal was substantially delayed by the apatite.

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Investigation of materials for reactive permeable barrier in removing cadmium and chromium(VI) from aquifer near a solid domestic waste landfill

Safonov

Popova

Andrushenko

et al. 2020

Environ Sci Pollut Res

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Use of Apatite for Chemical Stabilization of Subsurface Contaminants

Cited by 3 publications

References 70 publications

Mechanochemical synthesis of the copper autunites—a new route to remediation of potentially toxic elements

Mechanochemical synthesis of the copper autunites—a new route to remediation of potentially toxic elements

Sequestration of metals in active cap materials: A laboratory and numerical evaluation

Investigation of materials for reactive permeable barrier in removing cadmium and chromium(VI) from aquifer near a solid domestic waste landfill

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