Natural Attenuation of Acid Mine Drainage by Various Rocks in the Witbank, Ermelo and Highveld Coalfields, South Africa

Sakala, Emmanuel; Fourie, F.; Gomo, M.; Madzivire, Godfrey

doi:10.1007/s11053-020-09720-5

Cited by 10 publications

(7 citation statements)

References 8 publications

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“…The preliminary characterization of the feldspar washing slime provided positive feedback: it does not contain acid-producing minerals, while it is rich in calcite and hosts also feldspar. The buffering potential of feldspar, even though much lower and with lower reaction rates than calcite, is well known [27][28][29][30].…”

Section: Discussionmentioning

confidence: 99%

Recycling Feldspar Mining Waste as Buffering Agent for Acid Mine Drainage Mitigation

Grieco,

Cocomazzi,

Naitza

et al. 2024

Minerals

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Acid mine drainage (AMD) prevention or remediation is a major issue of the environmental management of sulfide-bearing active and abandoned mining sites, the main sources of acidic waters being wastes and tailings. The present work intends to check a circular economy approach to such issues in the mining region of Sardinia, where environmental pollution, due to AMD, is a major concern. Tests were conducted on basic drainage-producing feldspar mining wastes that could be recycled as buffering agents of sulfide-bearing tailings. Among the sulfide-bearing abandoned mining sites investigated, Furtei epithermal gold deposit tailings are the most polluting and those that can better test the buffering agent efficacy. Buffering test results show that buffering to near-neutral conditions can be attained following steps similar to those of pure calcite buffer. The buffering potential of the recycled waste is due to both the buffer calcite content, which provides short-term buffering, enhanced by feldspar content that can provide long-term buffering. Buffered waters show a dramatic decrease in the concentration of most of the metals present in the leachate, down to conditions that meet the requirements for the discharge of industrial waters according to Italian legislation.

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Section: Discussionmentioning

confidence: 99%

Recycling Feldspar Mining Waste as Buffering Agent for Acid Mine Drainage Mitigation

Grieco,

Cocomazzi,

Naitza

et al. 2024

Minerals

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“…In an attempt to find a cheaper reductant with minimal environmental consequences, it was proposed to investigate acid mine drainage (AMD). AMD is particularly problematic in South Africa in gold and coal mining areas in the Witwatersrand Basin and Witbank Coalfield (Sakala et al, 2021;Minnaar, 2020). However, chrome mines and the majority of platinum mines do not generate acid-producing wastes.…”

Section: Introductionmentioning

confidence: 99%

Treatment of chromium (VI) waste solutions with clay-based adsorbents after reduction with acid mine drainage

Mxinwa,

Golela,

Robertson

2024

J. S. Afr. Inst. Min. Metall.

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South Africa has one of the largest Cr-related industries in the world and generates large amounts of Cr-containing smelter dusts. It is normal practice to scrub Cr from the furnace off-gas in water, and to recover the Cr by adsorption, followed by recycling of the loaded adsorbent into the furnace. A study was conducted to find a low-cost adsorbent that is capable of removing sufficient Cr from the solutions generated by scrubbing. The test work focused on the evaluation of different clay minerals (attapulgite, bentonite, and kaolinite) as adsorbents for Cr. Cr(VI) could only be adsorbed after prereduction with e.g. ascorbic acid (ASA). An 80% removal of Cr(VI) could be achieved from a solution containing 20 mg/L Cr using bentonite clay after reduction with ASA. Attapulgite and kaolinite adsorbed less than 55% Cr after reduction with ASA. Both ASA and ferrous salts were found to be suitable reducing agents. The use of acid mine drainage (AMD) was also investigated as a low-cost alternative reducing agent, as AMD usually contains iron. The Cr(VI) reduction potential of the AMD was determined by redox titration against a solution containing 50 mg/L Cr(VI). Studies show that AMD can potentially be used as a reducing agent in a Cr removal process if it is available on site.

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“…Mining activities are subject to various hazards, including spontaneous combustion [1], [2]. Adverse consequences of the spontaneous combustion of coal include environmental problems [3], [4], economic losses [5], and safety-and workrelated problems [6]. An assessment of the potential tendency for spontaneous combustion is, hence, extremely important in order to reduce economic, social, and environmental risks [7].…”

Section: Introductionmentioning

confidence: 99%

The Spontaneous Combustion Potency of Lignite Coal Based on FTIR

Hamdani

Haryanto

2022

EJGEO

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To understand the role of functional groups in the spontaneous combustion of lignite coal, the distribution of functional groups in the lignite coal of the Sajau Formation in the Berau Basin, Indonesia, was studied. The functional group characterization was carried out using the Fourier Transform Infra Red (FTIR) method. The results revealed the presence of four functional groups, namely hydroxyl structures, aliphatic structures, oxygen-containing structures, and aromatic structures. The lignite contained more hydroxyl and oxygen-bearing functional groups, from which aliphatic and aromatic; therefore, spontaneous combustion becomes easy in lignite coal.

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Natural Attenuation of Acid Mine Drainage by Various Rocks in the Witbank, Ermelo and Highveld Coalfields, South Africa

Cited by 10 publications

References 8 publications

Recycling Feldspar Mining Waste as Buffering Agent for Acid Mine Drainage Mitigation

Recycling Feldspar Mining Waste as Buffering Agent for Acid Mine Drainage Mitigation

Treatment of chromium (VI) waste solutions with clay-based adsorbents after reduction with acid mine drainage

The Spontaneous Combustion Potency of Lignite Coal Based on FTIR

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