Metal Recovery and Exploitation of Lignite Ashes by Combined Physicochemical and Biotechnological Approaches

René Kermer; Sabrina Hedrich; Beate Brett; Daniel Schrader; Konstantin Räuchle; Petra Schönherr; Axel Schippers; Susan Reichel; Franz Glombitza; Eberhard Janneck

doi:10.4028/www.scientific.net/AMR.1130.296

Paper Titles

Influence of Carbonate Solubilisation on Copper Leaching from Kupferschiefer with Organic Acids
p.278

Evolution of Leaching Products on the Surface of Chalcopyrite by Mesophiles and Thermophiles Based on SR-XRD and XANES Spectroscopy
p.282

Iron Oxidized Acidophiles Distribution and Activities in an Uranium In Situ Bioleaching Site
p.287

Solution pH and Jarosite Management during Ferrous Iron Biooxidation in a Novel Packed-Column Bioreactor
p.291

Metal Recovery and Exploitation of Lignite Ashes by Combined Physicochemical and Biotechnological Approaches
p.296

Bioleaching of a Molybdenite Concentrate by Thermophilic Microorganisms in a New RELVA-RBAL 1 AIR LIFT Bio-Reactor
p.300

Physical Peeling of Passivating Layers on Chalcopyrite Leached with Ferric Ion Using Small Alumina Balls
p.304

Utilisation of Inorganic Substrates by Alicyclobacillus - Like Strain FP1
p.308

Systems Biology of Acidophile Biofilms for Efficient Metal Extraction
p.312

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Metal Recovery and Exploitation of Lignite Ashes by Combined Physicochemical and Biotechnological Approaches

Abstract:

Ashes from lignite combustion for power generation contain strategic metals, metalloids and rare earth elements and may thus be a potential source of industrially demanded metals. The presented project focuses on the assessment and exploitation of this potential raw material. Lignite ash assessment showed that largest ash amounts for potential exploitation are available in the Lusatia district, Saxony. Mechanical ash pre-treatment in principle provided enriched fractions by different methods but still suffered from low yields of enriched fractions. Thermal ash processing showed multiple significant phase changes compared to original ash. Subsequent chemical leaching using HCl_aq resulted in high metal extraction. Alternatively, bioleaching was applied using acidophilic Fe (II) and S-oxidizing or Fe (III)-reducing microorganisms (MO) as well as heterotrophic MO. The results indicated likewise high and partly specific metal mobilizations. Industrial ash exploitation was accomplished by direct reaction with acids resulting in Al-Fe-solutions which potentially can be applied in water treatment.