Leaching Lead Tailings In South Africa

Recovery of Zinc and Copper from Mine Tailings by Acid Leaching …

Mine tailing storage represents an important environmental issue. The generation and dispersal of dust from mine tailings can contaminate air and surrounding soils. In addition, metals and soluble salts present in these wastes could pollute groundwater and surface water. The recovery of metals from mine tailings can contribute to minimize the environmental risk …

Gold tailings reclamation in South Africa

lishment, leaching, and maintenance. The information with regards to the procedures followed by the two Vegetation Units is adapted from Cook (1985) and slightly altered and expanded by the second author. Gold Tailings Reclamation in South Africa Introduction This paper is partially adapted from B J Cook ( 1985). Under the guidance of the late Mr

A critical review on bioremediation technologies of …

The physical-chemical strategies of conventional technologies, such as constructed barriers were implemented to prevent the further spreading of tailings, but are limited by their high costs (approximately 100–500 $/ton) (Cristaldi et al., 2017).Phytoremediation are also limited because the acidification conditions of tailings may inhibit the survival of native plants (Zhou …

Mineral carbonation of PGM mine tailings for CO2 storage in South

These same tailings also contain [ 10% Al and may therefore represent suitable alternatives to Al import or to coal fly ash as secondary Al resource [18,19], since South Africa is deprived of ...

Oxidative leaching of refractory sulphidic gold tailings with …

The effect of temperature in the range of 20–65 °C on gold extraction from refractory gold tailings containing pyrite in 20% (v/v) of 1-butyl-3-methylimidazolium hydrogen sulphate [Bmim + HSO 4 −]-water solution with thiourea as complexing agent and iron(III) sulphate oxidant, at pH of 1 was examined for 12 h leaching time intervals.The experimental …

Contaminant leaching from gold mining tailings dams in the

1. Introduction. Acid mine drainage (AMD), resulting from the gold mining activities in the Witwatersrand, South Africa, has become the focus of intense study in recent years …

(PDF) Environmental impact of gold tailings and the long …

The gold mining industry in South Africa uses about 700,000 tons of lime per year worth 34 million rand (1 rand = 0,5 U.S. dollar). It is estimated that about ten percent of this is used to ...

Potential risk, leaching behavior and mechanism of

The leaching rates of heavy metals were pH-dependent and related to their chemical speciations in the mine tailings. The leaching behavior of Cu and Cd was dominated by surface wash-off, Zn was controlled by diffusion initially and then surface wash-off, and the leaching mechanisms of Pb and As varied with the pH conditions.

v116n6a10 Copper solvent extraction: status, operating …

to be transported by road from South Africa, Namibia, or Tanzania. Many sites have therefore installed sulphur-burning plants to produce their own sulphuric acid on site ... commissioned at the Nchanga Tailings Leach Plant (TLP) in Zambia in 1974, with a daily production of 200 t Cu cathode (Holmes et al., 1976). The mixer–settlers ...

Contamination of groundwater by potential harmful

Mining of gold in the Welkom and ia areas of the Free State Province in South Africa has produced numerous gold mine tailings, which contain a variety of contaminants. The extent of contamination of groundwater in the area was studied by measuring several water quality indicators at eight sampling sites, and within three zones. The overall …

A Comprehensive Review on Reasons for Tailings Dam Failures …

In 1994, the Merriespruit tailings dam in South Africa failed, releasing 600,000 m 3 of tailings and 90,000 m 3 of tailings water [81, 117 – 119]. The tailings dam broke after a few hours of thundershowers . It is worth mentioning that this tailings pond is basically an upstream structure with less freeboard length and less reservoir area.

Determination of cyanide and potentially toxic elements …

396 Kleinmann, B., Skousen, J., Wolkersdorfer, Ch. West ia Mine Drainage Task Force Symposium & 15th International Mine Water Association Congress 2024 Figure 2 Morphology and sample map of sampling sites in tailings dump MgO, Fe 2 O 3 and Al

Heavy metal concentration in soil in the tailing dam vicinity …

Soil contamination with heavy metals is a serious concern to food production and human health. The present study was conducted to evaluate the impact of tailings from an old mining site on heavy metal contamination of soil. Using a GPS to map out different sites around the tailing dam, soil samples were taken from under grassland at the different sites, at depths …

REPROCESSING AND TAILINGS REDUCTION

Stantec's Global Tailings Practice Lead, said in response to a question about what strategies miners were evaluating for legacy tailings dams/waste stockpiles within their portfolios. Speaking from his home office in Brisbane, Australia, in April, he reflected on his time . working in South Africa to provide some

Determination of cyanide and potentially toxic elements …

Keywords: ICP-OES, tailings, cyanide, potentially toxic metals, environmental monitoring Determination of cyanide and potentially toxic elements in gold tailings at Barberton, …

Mine Waste Leaves Toxic Legacies in South Africa …

Tailings dams in South Africa pose serious risks to communities and ecosystems. The Mine Tailings Working Group of South Africa, a partnership of civil society groups including the Bench Marks Foundation, …

Contamination of groundwater by potential harmful

The rapid growing gold mining industry brought South Africa to the forefront as one of the most industrialised countries in Africa. ... (PHEs), such as mercury (Hg), arsenic (As), cadmium (Cd) and lead (Pb) (Ngure et al., ... the contaminants from the gold mine tailings may also leach into groundwater (Keesstra et al., 2012), ...

(PDF) Environmental impact of gold tailings and …

The gold mining industry in South Africa uses about 700,000 tons of lime per year worth 34 million rand (1 rand = 0,5 U.S. dollar). It is estimated that about ten percent of this is used to ...

Characterisation of gold tailings dams of the Witwatersrand …

Factors which play a role in acid mine drainage (AMD) formation were investigated over a period of 12 months. These include climatic, mineralogical, hydrological and oxygen diffusion parameters. The oxygen diffusion data reveal that the flow of oxygen in the Witwatersrand tailings dams is controlled by secondary porosity (i.e. cracks caused by roots …

An underexploited invisible gold resource in the Archean

The tailings dumps originating from gold mining in South Africa's Witwatersrand still contain notable gold endowments. Most tailings reprocessing operations target a native gold fraction using ...

Heap leaching as a key technology for recovery of

Given the operation is based in South Africa, ... zinc, tin, lead etc. from electronic scrap (by bioleaching and chemical leaching; Ilyas et al., 2013). ... Re-leaching of tailings and residue materials, either to liberate additional value left behind due to incomplete extraction (especially in the context of historic gold tailings) or to ...

Column Leaching of Fine Coal Tailings: Impact on …

The ICP analyses showed that Ca and Na were most likely to leach from the tailings; the major metal pollutants leached were Al, Ca, Fe, Mg, Mn and Na. Synthetic acid rain had more effects on the ...

(PDF) Copper solvent extraction: Status, …

possible by producing copper on a short lead time. Cathode ... South Africa, or Tanzania, a distance of 2200 to ... and PARKER, J.D. 1976. Design, construction and commissioning of the Nchanga ...

Environmental impact of leach water from selected mine …

I declare that "Environmental impact of leach water from selected mine tailings materials in South Africa" was achieved in the School of Geo- and Spatial Sciences (Geology / Soil Science) at the NWU (Potchefstroom Campus) from March 2016 till November 2018. This dissertation is my own work and may include the original leaching results of

The Use of Acid Leaching to Recover Metals from Tailings: A …

In 2008, Antonijevic proposed copper recovery from Bor copper mine tailings through acid leaching. The tailings had around 21% sulfide content and 0.2% copper, with a particle size of approximately 0.074 mm. He used a 1-L beaker with mechanical and magnetic agitators, employing 500 mL of leaching solution and 100 g of sample (−0.0074 mm).

Heavy metal pollution caused by cyanide gold leaching: a

It is known that the tailings of gold mines have brought serious heavy metal pollution; however, the heavy metal pollution caused by gold tailings in specific geological environments and extraction processes still must be studied. This study investigated the distribution, speciation, bioaccumulation, and pollution of heavy metals in soils from the …

(PDF) Evaluation of pre-treatment methods for gold recovery …

South Africa has over 500 gold tailings dumps, several of which have the potential to be profitably reprocessed (Janse van Rensburg, 2016). Gold lost to the dumps is attributed t o inherent process

Ion mobility based on column leaching of South African gold tailings …

Request PDF | Ion mobility based on column leaching of South African gold tailings dam with chemometric evaluation | New column leaching experiments were designed and used as an alternative rapid ...

Feasibility of tailings retreatment to unlock value and create

The tailings retreatment sector in South Africa has been receiving a lot of attention due to the economic, ... where elemental sulfur was added to the tailings and the pH of leach liquors allowed ...

Leaching of Cu, Zn, and Pb from Sulfidic Tailings Under the …

The imbalance between raw materials of high economic importance and their supply has increased the search for new approaches to obtain valuable elements from mining tailings. In this study, the extraction of copper, zinc, and lead from sulfidic tailing in sulfate–chloride media was investigated. A 33 Box–Behnken design was applied to evaluate …