Fractioning of multicomponent mixture is used to valorize waste material, remove unwanted components and enable the utilization of secondary resources in production of raw materials.
Our proprietary technology allows us to produce novel materials that will collect desired ions selectively from liquids even at very low concentrations. The inner structure, shape and size of the collection unit can be designed without major restrictions. Pressure drop and residence time of the unit is easily controlled custom design of internal flow channels and the porosity of the material.
Depending on customer requirements, our products can be either customized to operate as a part of existing process without prominent modifications to the system, or implemented as an off-line operating, stand alone unit.
Read more about the WeeeFINer™ 3D printed scavenger technology:
Recovering Platinum and Palladium
Porous 3D Printed Scavenger Filters for Selective Recovery of Precious Metals from Electronic Waste. Lahtinen, E., Hänninen, M.H., Kinnunen, K., Tuononen, H.M., Väisänen, A., Rissanen, K., Haukka, M. (2018). Advanced Sustainable Systems. Volume 2, Issue 10, October 2018. https://onlinelibrary.wiley.com/doi/10.1002/adsu.201800048
Selective laser sintering (SLS) 3D printing is used to fabricate highly macroporous ion scavenger filters for recovery of Pd and Pt from electronic waste. The scavengers are printed by using a mixture of polypropylene with 10 wt% of type‐1 anion exchange resin. Porosities and the flow‐through properties of the filters are controlled by adjusting the SLS printing parameters. The cylinder‐shaped filters are used in selective recovery of Pd and Pt from acidic leachate of electronic waste simply by passing the solution through the object. Under such conditions, the scavenger filters are able to capture Pd and Pt as anionic complexes with high efficiency from a solution containing mixture of different metal ions. By using the Pd/Pt scavenger together with previously reported, highly selective nylon‐based Au scavenger, precious metals, i.e., Au, Pd, and Pt could all be recovered from the electronic waste leachate in a single flow‐through process. One of the main advantages of the printed scavengers is that all recovered metals can be easily extracted from the filters as separate fractions by using aqueous solutions of thiourea or diluted nitric acid. After removal of the captured metals, the scavengers are reusable without significant loss of their ion‐capturing performance.
Recovering Gold from Electronic Waste (e-Waste)
Lahtinen, E., Kivijärvi, L., Tatikonda, R., Väisänen, A., Rissanen, K., & Haukka, M. (2017). Selective recovery of gold from electronic waste using 3D-printed scavenger. ACS Omega, 2 (10), 7299-7304. doi:10.1021/acsomega.7b01215. https://pubs.acs.org/doi/full/10.1021/acsomega.7b01215
Around 10% of the worldwide annual production of gold is used for manufacturing of electronic devices. According to the European Commission, waste electric and electronic equipment is the fastest growing waste stream in the European Union. This has generated the need for an effective method to recover gold from electronic waste. Here, we report a simple, effective, and highly selective nylon-12-based three-dimensional (3D)-printed scavenger objects for gold recovery directly from an aqua regia extract of a printed circuit board waste. Using the easy to handle and reusable 3Dprinted meshes or columns, gold can be selectively captured both in a batch and continuous flow processes by dipping the scavenger into the solution or passing the gold containing solution through the column. The possibility to optimize the shape, size, and flow properties of scavenger objects with 3D printing enables the gold scavengers to match the requirements of any processing plants.