Authors: Connelly, D

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DOI https://doi.org/10.36487/ACG_repo/2115_04

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Connelly, D 2021, 'Lessons learned from thickening and filtering tailings for dry stacking', in AB Fourie & D Reid (eds), Paste 2021: 24th International Conference on Paste, Thickened and Filtered Tailings, Australian Centre for Geomechanics, Perth, pp. 31-42, https://doi.org/10.36487/ACG_repo/2115_04

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Abstract:
The metallurgical testwork for a new gold project indicated acceptable settling rates and filtration rates. The equipment was sized, and the plant constructed. Subsequently, commissioning of the thickening and filtration for dry stacking of tailings indicated serious deficiencies with the design and a much lower achievable throughput. The throughput was some 30% of design and cash flow considerations were that the project throughput was restricted by poor performance of the thickeners and tailings filtration acting as a bottleneck. Mineral Engineering Technical Services Pty Ltd was commissioned with the task of increasing filtration throughput and removing the bottleneck. For the thickeners, new flocculants were evaluated, changes to the flocculant dilution were made, and thickener underflow pump speeds were increased. An additional filter feed storage tank was installed to allow for short-term filter shutdowns. With the two belt filters, various flocculants, guar and diatomaceous earth were evaluated. Also, more permeable filter cloths were evaluated in order to increase filtration rates. The single biggest improvement achieved was with the use of coagulants. This paper describes how the task was managed and what steps were taken to achieve design throughput.

Keywords: argillic alteration, filtering, kaolin clay, tailings stacking

References:
Colquhoun, W, Taylor, G, Marinho, RM & Simon, A 2007, Casposo Project Technical Report on Feasibility Study, unpublished report to Intrepid Minerals Corporation.
METS 2009a, Casposo Gold-Silver Project: Previous Metallurgical Testwork Summary, unpublished report to Troy Resources NL, Mineral Engineering Technical Services Pty Ltd.
METS 2009b, Casposo Milling Circuit Simulation Report, unpublished report to Troy Resources NL, Mineral Engineering Technical Services Pty Ltd.
METS 2010a, Casposo Gold-Silver project: Metallurgical Testwork Summary Report, unpublished report to Troy Resources NL, Mineral Engineering Technical Services Pty Ltd.
METS 2010b, Casposo Gold-Silver project: Process Description, unpublished report to Troy Resources NL, Mineral Engineering Technical Services Pty Ltd.




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