Kyushu University · Environmental Science
Professor Gde Pandhe Wisnu Suyantara's research lab specializes in mineral processing and hydrometallurgy, with a strong focus on developing sustainable and environmentally friendly methods for the selective separation of valuable and problematic minerals. The lab investigates advanced reagents—such as hydrogen peroxide, oxalic acid, and Fenton-like systems—to selectively control mineral surface properties and improve flotation efficiency in complex sulfide systems. Key research directions include the decontamination of copper concentrates by removing arsenic-bearing minerals, the selective separation of lead and zinc sulfides, and the purification of zirconium by separating it from hafnium, all aimed at enhancing resource recovery and reducing environmental impact. The lab emphasizes green chemistry principles and fundamental surface science to address challenges in critical metal extraction and processing.
Figures are computed from collected data and may differ slightly.
Enargite is typically associated with chalcocite. Owing to the similarity in the flotation behaviors of these minerals, both minerals are reported to concentrate in the conventional flotation circuit. However, inorganic arsenic in enargite can decrease the copper concentrate quality and increase the operating cost of processing this concentrate. Separating these minerals is important for cleaner copper production to avoid these effects. In this context, this study investigated the effect of hydr
• Oxalic acid (OA) is proposed as a green reagent for separating PbS and Pb-activated ZnS. • OA selectively separates Pb-activated ZnS and PbS in flotation. • OA inhibits ZnS flotation while allowing PbS flotation by forming Pb-oxalate (PbOx). • PbOx detaches from ZnS, removing Pb species and hindering xanthate adsorption. The separation of sphalerite (ZnS) and galena (PbS) is challenging owing to activation of the sphalerite surface by unavoidable metal ions, such as lead ions (Pb 2+ ) released
Zirconium is non-corrosive material and has high melting point. Due to its low neutron capture cross section, zirconium can be used as cladding material replacing silicon carbide (SiC) in nuclear fuel kernel. As cladding material, hafnium content in zirconium must be below 0.01% or 100 ppm. This because hafnium has neutron capture cross section 470 higher than zirconium. This property of hafnium will disturb the fission nuclear reaction. Beside that hafnium can be used as controlling rod materia
This study investigated the effects of potassium amyl xanthate (KAX) and oxidation treatment using hydrogen peroxide (H2O2) on the selective flotation of copper concentrates containing arsenic-bearing copper minerals. The mineralogical analysis revealed that enargite and chalcopyrite were the main arsenic-bearing copper and copper sulfide minerals, respectively, in the copper concentrate. KAX treatment at pH 9 improved the recoveries of copper sulfide and arsenic-bearing copper minerals. However
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