CHEMICALS & PHARMACEUTICALS
In the case of solvent streams, valuable solvents can be further purified and reused [2]. Companies can typically expect to recover up to 95% of used solvents, even from more complex mixtures. In terms of quality and purity, most recovered solvents are indistinguishable from their original forms.
Case studies 1 and 2 demonstrate two examples of palladium extraction from organic waste and an organic aqueous mixture, respectively. In both cases, the liquid fraction comprised 95% or more of the waste stream, but appropriate treatment of both the metal and liquid fractions enabled a circular economy, while hazardous components were safely destroyed. By recovering precious metals and re-using them, industrial manufacturers have a constant and sustainable supply, a simplified, localised supply chain, and a reduced carbon footprint to contribute to their sustainability objectives. Precious metal recovery from liquid streams reduces the need for polluting mining activities and demonstrates up to 98% carbon footprint reduction.
Indaver is dedicated to extracting precious metals and solvents from liquid streams, even at very low concentrations, while ensuring the safe destruction of hazardous components. Companies like ours are closing the loop on precious metals and clearing the path for industry towards a circular economy.
Case studies of palladium extraction from liquid streams Case study 1:
Case study 2:
Objective: To recover palladium from an organic waste stream with 600 ppm palladium Precious metal extraction: Thermal reduction on the Antwerp site’s Line 1 => ~5% metal fraction (semi-solid with high precious metal concentration) Thermal treatment of metal fraction => 0.1–0.3% volume of platinum-group metal (PGM) rich ashes with ~30% palladium Liquid fraction treatment:
94–96% liquid fraction of solvent with minor impurities; solvents were recycled
=> Highly efficient precious metal recovery and full circular process for the entire waste stream
References: [1]. Yao C, Hengjun S, Yuqing R, et al. Systematic assessment of precious metal recovery to improve environmental and resource protection. ACS ES&T Engineering 2022;2:1039–1052. [2]. Barker S. High-End Circular Solvents: A Path
Objective: To recover palladium from an organic aqueous mixture with 30 ppm palladium Precious metal extraction: Treatment on Antwerp site’s Line 2 => 2–5% metal fraction (dry powder with high precious metal concentration) Thermal treatment of metal fraction => 1–3% volume of platinum-group metal (PGM) rich ashes Liquid fraction treatment:
95–98% liquid fraction of aqueous solvent treated at on-site waste to energy installation
=> Highly efficient precious metal recovery plus maximised energy recovery and safe destruction of hazardous components
to Sustainability. Chemicals Industry Journal 2025;38:42–43.
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