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Evaluating applications of bed and fly ash for controlling acid and metalliferous drainage – examples from Tasmanian mine wastes

Citation

Clifton, R and Parbhakar-Fox, A and Fox, N, Evaluating applications of bed and fly ash for controlling acid and metalliferous drainage - examples from Tasmanian mine wastes, Proceedings for the Life-of-Mine 2016 Conference, 28-30 September 2016, Brisbane, Australia, pp. 1-5. (2016) [Non Refereed Conference Paper]


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Abstract

The use of alkaline materials (eg limestone (CaCO3)), quicklime (CaO) and, more recently, hydrotalcite (Mg6Al2CO3(OH)16·4(H2O)) to neutralise and control acid and metalliferous drainage (AMD) is a well-established global practice (Douglas et al, 2010). However, active treatment of AMD using these materials is costly. Alternatively, alkaline-rich industrial by-products, such as boiler ash produced by paper mills, could be used. Recent studies (Doye and Duchesne, 2005; Yeheyis, Shang and Yanful, 2009; Jia, Maurice and Öhlander, 2014; Mäkitalo, 2015) describe the application of pulp mill waste for AMD control by experimenting with waste rock and tailings. The success of the material as a neutraliser was dependant on its physical properties (eg plasticity; Mäkitalo, 2015) and chemistry (ie chromium, cadmium and copper content). Alternative uses for industrial by-products has the potential to be environmentally beneficial when used in AMD management, with financial advantages offered through decreased disposal costs and an additional revenue stream through the sale of ash (Yeheyis, Shang and Yanful, 2009).

In Tasmania, there are approximately 4000 legacy mine sites, 215 of which pose an environmental threat through AMD risk (Pepper, Roche and Mudd, 2014). A cost-effective, environmentally sustainable method of AMD treatment is needed. This research aims to evaluate the AMD mitigation potential of combining boiler ash (collected from an active paper manufacturing operation in Australia) with sulfidic mine waste on historic sites; a process yet to be undertaken in Tasmania. Waste rock and tailings materials with different geochemical properties from across the state will be tested to determine the most efficient combination of boiler ash and sulfidic mine waste materials.

Item Details

Item Type:Non Refereed Conference Paper
Keywords:acid mine drainage, boiler ash, waste rock, mining, Tasmania
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Exploration Geochemistry
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Mining Land and Water Management
Author:Clifton, R (Ms Bec Clifton)
Author:Parbhakar-Fox, A (Dr Anita Parbhakar-Fox)
Author:Fox, N (Dr Nathan Fox)
ID Code:110813
Year Published:2016
Deposited By:CODES ARC
Deposited On:2016-08-15
Last Modified:2017-02-24
Downloads:0

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