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ECN publication
Characterisation leaching tests and associated geochemical speciation modelling
Sloot, H.A. van der; Zomeren, A. van
Published by: Publication date:
ECN Environment & Energy Engineering 1-9-2012
ECN report number: Document type:
ECN-V--12-020 Article
Number of pages: Full text:
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The pH dependence leaching tests (CEN/TS14429 and the percolation CEN/TS 14405) developed in CEN/TC 292 have been applied for the first time to characterise the release behaviour of different sulfidic wastes. The comparison of the leaching test data for 7 tailings and 2 waste rock samples has given new insights in release behaviour. The geochemical speciation modeling using LeachXS-Orchestra provides another type of partitioning between mineral and sorptive phases than currently practised in the mining industry. In leaching, mineral transformations on the surface of waste rock or tailings particles dictate release rather than bulk mineral composition. Kinetic aspects of release from sulfidic waste can be addressed by testing material in different stages of oxidation or exposure to atmospheric conditions.

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