{"id":14904,"date":"2022-10-12T17:57:51","date_gmt":"2022-10-12T15:57:51","guid":{"rendered":"https:\/\/2025.mining-report.de\/english\/?p=14904"},"modified":"2022-10-12T18:01:35","modified_gmt":"2022-10-12T16:01:35","slug":"extracting-important-valuable-substances-from-mine-water-new-project-at-the-thgas-research-center-of-post-mining","status":"publish","type":"post","link":"https:\/\/mining-report.de\/english\/blog\/extracting-important-valuable-substances-from-mine-water-new-project-at-the-thgas-research-center-of-post-mining\/","title":{"rendered":"Extracting important valuable substances from mine water: New project at the THGA\u2019s Research Center of Post-Mining"},"content":{"rendered":"

Resources are becoming scarcer, energy prices are rising. In addition, dependence on third countries has led to a global rethink when it comes to extracting raw materials. New ways must be found to extract valuable materials ecologically and economically. That these ways also follow unusual ideas is shown by a new project that has now started at the Research Center of Post-Mining (FZN) at the TH Georg Agricola University (THGA), Bochum\/Germany: Over the next two years, the scientists in the \u201cIAW33<\/sup>\u201d project will investigate whether strategic raw materials can still be extracted from mine water and which methods are best suited for this. With the help of new processing technologies, critical metals in particular are to be extracted. The experts not only look at the mine water itself, but also examine its precipitation products and treatment residues. They conduct their investigations at various mines in the Ruhr, Saar and Ibbenb\u00fcren regions.<\/p>\n

The research project is initially funded by the RAG-Stiftung, Essen\/Germany, until 2024. The full project title is: Innovative processing technologies and their potential for recovering valuable materials from mine water, precipitation products and processing residues at Ruhr, Saar and Ibbenb\u00fcren with special consideration of critical metal resources, in short: IAW33<\/sup>.<\/p>\n

\u201cFor us, post-mining does not only mean dealing with the challenges that the coal industry has left us. In the field of post-mining, it is also a matter of developing new possibilities and opportunities in the former coalfields,\u201d says B\u00e4rbel Bergerhoff-Wodopia, Member of the Board of Executives of the RAG-Stiftung. \u201cThe new research project around the extraction of strategic raw materials from mine water is a highly exciting field of the future that is geared towards sustainability. It can contribute to reducing dependencies in raw material extraction. Just how important independence can be in this field is particularly evident to us these days. That is why we as the RAG-Stiftung are very happy to support this special project.\u201d<\/p>\n

\u201cWe see mine water as a potential stream of valuable materials,\u201d says Prof. Christian Melchers, who heads the project at FZN. \u201cThe innovative thing about our idea is that we not only look at the mine water itself, but also examine the residues from treatment and its precipitation products. Precipitation refers to the separation of a dissolved substance from a solution.\u201d What is sludge and silt for the layman is a real treasure trove for the experts at the FZN: \u201cRecent investigations have shown that it contains, e.\u2009g., magnesium, which is used in engine construction. In the past, there have already been supply bottlenecks with the Chinese market leader. At best, we want to counteract these dependencies,\u201d explains project member Bastian Reker (Figure 1). Rare earths, which can drive the expansion of renewable energies, or lithium, which is crucial for e-mobility, are also found.<\/p>\n

The scientists are also examining the quantities of the critical element germanium in the mine water. \u201cThis is a by-product that is otherwise only produced during zinc extraction and is essential for the coating of fibre optic cables and thus for the expansion of the network,\u201d says Reker. \u201cCurrently, all of these raw materials are being extracted worldwide under sometimes dubious environmental standards that affect people and the environment equally,\u201d adds Prof. Melchers. \u201cThis simply no longer fits in with the spirit of the times and the growing ecological awareness in our society. We therefore want to initiate a rethink, accompany the processes scientifically and thus look for new possibilities on our own doorstep.\u201d<\/p>\n

The mine waters that are lifted from great depths with pumps in the former coalfields of the Ruhr, Saar and Ibbenb\u00fcren show a wide range of different mineralisations and enrichments \u2013 depending on the regional geology, hydrogeology and other influencing factors left behind by mining, explains expert Prof. Melchers: \u201cWe are now examining the extent to which it is also economically worthwhile to collect and process these valuable substances.\u201d<\/p>\n

To this end, the scientists will be setting up their own precipitation reactors at suitable locations in the coming months. In them, iron and other metals will be separated in a targeted manner by adding oxygen. They want to transfer the knowledge they gain from designing the plants on a laboratory scale to experimental plants on a large scale. In the IAW33<\/sup> project, the scientific team is also testing completely new processing technologies. Hyperspectral sensors, e.\u2009g., could help to directly detect the critical metals in mine water and co. and assess their mineralogical composition in a matter of seconds. The most promising methods are to be further developed at the FZN. (THGA\/Si.)<\/p>\n","protected":false},"excerpt":{"rendered":"

Resources are becoming scarcer, energy prices are rising. In addition, dependence on third countries has led to a global rethink when it comes to extracting raw materials. 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