Search Results - "Naoki Hiroyoshi"

A review of recent strategies for acid mine drainage prevention and mine tailings recycling by Park, Ilhwan, Tabelin, Carlito Baltazar, Jeon, Sanghee, Li, Xinlong, Seno, Kensuke, Ito, Mayumi, Hiroyoshi, Naoki

“…Acid mine/rock drainage (AMD/ARD), effluents with low pH and high concentrations of hazardous and toxic elements generated when sulfide-rich wastes are exposed…”
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Acid mine drainage formation and arsenic mobility under strongly acidic conditions: Importance of soluble phases, iron oxyhydroxides/oxides and nature of oxidation layer on pyrite by Tabelin, Carlito Baltazar, Corpuz, Ryan D., Igarashi, Toshifumi, Villacorte-Tabelin, Mylah, Alorro, Richard Diaz, Yoo, Kyoungkeun, Raval, Simit, Ito, Mayumi, Hiroyoshi, Naoki

“…[Display omitted] •Interactions of pyrite, salts & metal oxides under acidic conditions were evaluated.•Soluble salts exhibited stronger effects on pyrite…”
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Copper and critical metals production from porphyry ores and E-wastes: A review of resource availability, processing/recycling challenges, socio-environmental aspects, and sustainability issues by Tabelin, Carlito Baltazar, Park, Ilhwan, Phengsaart, Theerayut, Jeon, Sanghee, Villacorte-Tabelin, Mylah, Alonzo, Dennis, Yoo, Kyoungkeun, Ito, Mayumi, Hiroyoshi, Naoki

“…•~243 Mt of E-wastes is estimated to be generated globally by 2050.•Complex sulfides, ultrafine particles & “dirty” concentrates are major ore processing…”
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Pyrite oxidation in the presence of hematite and alumina: I. Batch leaching experiments and kinetic modeling calculations by Tabelin, Carlito Baltazar, Veerawattananun, Suchol, Ito, Mayumi, Hiroyoshi, Naoki, Igarashi, Toshifumi

“…Pyrite is one of the most common and geochemically important sulfide minerals in nature because of its role in the redox recycling of iron (Fe). It is also the…”
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Simultaneous suppression of acid mine drainage formation and arsenic release by Carrier-microencapsulation using aluminum-catecholate complexes by Park, Ilhwan, Tabelin, Carlito Baltazar, Seno, Kensuke, Jeon, Sanghee, Ito, Mayumi, Hiroyoshi, Naoki

“…Pyrite (FeS2), the most common sulfide mineral in nature, plays an important role in the formation of acid mine drainage (AMD), one of the most serious…”
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Suppression of arsenopyrite oxidation by microencapsulation using ferric-catecholate complexes and phosphate by Park, Ilhwan, Higuchi, Kazuki, Tabelin, Carlito Baltazar, Jeon, Sanghee, Ito, Mayumi, Hiroyoshi, Naoki

“…Mineral processing, pyro- and hydrometallurgical processes of auriferous sulfide ores and porphyry copper deposits (PCDs) generate arsenopyrite-rich wastes…”
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Ammonium thiosulfate extraction of gold from printed circuit boards (PCBs) of end-of-life mobile phones and its recovery from pregnant leach solution by cementation by Jeon, Sanghee, Tabelin, Carlito Baltazar, Park, Ilhwan, Nagata, Yoshito, Ito, Mayumi, Hiroyoshi, Naoki

“…In this study, the ammonium thiosulfate leaching of gold (Au) from printed circuit boards (PCBs) of end-of-life mobile phones and the subsequent recovery of…”
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Suppressive effects of ferric-catecholate complexes on pyrite oxidation by Li, Xinlong, Hiroyoshi, Naoki, Tabelin, Carlito Baltazar, Naruwa, Kosuke, Harada, Chie, Ito, Mayumi

“…Pyrite, a common gangue mineral in complex sulfide ores and coals, is rapidly oxidized in water by ferric ions and dissolved oxygen to form a very acidic and…”
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Suppression of the release of arsenic from arsenopyrite by carrier-microencapsulation using Ti-catechol complex by Park, Ilhwan, Tabelin, Carlito Baltazar, Magaribuchi, Kagehiro, Seno, Kensuke, Ito, Mayumi, Hiroyoshi, Naoki

“…[Display omitted] •Ti(IV) Tris-catecholate complex was synthesized between pH 5 and 12.•Ti-based CME limited the release of As from arsenopyrite.•Mechanism of…”
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Galvanic Microencapsulation (GME) Using Zero-Valent Aluminum and Zero-Valent Iron to Suppress Pyrite Oxidation by Seng, Sophea, Tabelin, Carlito Baltazar, Kojima, Motoya, Hiroyoshi, Naoki, Ito, Mayumi

“…Pyrite is a common gangue mineral in mine wastes, and its oxidation is the primary cause of acid mine drainage (AMD) formation, which is a very serious…”
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Solid-phase partitioning and release-retention mechanisms of copper, lead, zinc and arsenic in soils impacted by artisanal and small-scale gold mining (ASGM) activities by Tabelin, Carlito Baltazar, Silwamba, Marthias, Paglinawan, Florifern C., Mondejar, Alissa Jane S., Duc, Ho Gia, Resabal, Vannie Joy, Opiso, Einstine M., Igarashi, Toshifumi, Tomiyama, Shingo, Ito, Mayumi, Hiroyoshi, Naoki, Villacorte-Tabelin, Mylah

“…Artisanal and small-scale gold mining (ASGM) operations are major contributors to the Philippines’ annual gold (Au) output (at least 60%). Unfortunately, these…”
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Pyrite oxidation in the presence of hematite and alumina: II. Effects on the cathodic and anodic half-cell reactions by Tabelin, Carlito Baltazar, Veerawattananun, Suchol, Ito, Mayumi, Hiroyoshi, Naoki, Igarashi, Toshifumi

“…The oxidative dissolution of pyrite is an important process in the redox recycling of iron (Fe) and is well-known for its role in the formation of acid mine…”
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Enhanced cementation of gold via galvanic interactions using activated carbon and zero-valent aluminum: A novel approach to recover gold ions from ammonium thiosulfate medium by Jeon, Sanghee, Tabelin, Carlito Baltazar, Takahashi, Hirotaka, Park, Ilhwan, Ito, Mayumi, Hiroyoshi, Naoki

“…In gold (Au) hydrometallurgy, ammonium thiosulfate is the most attractive and promising alternative to conventional lixiviants like cyanide or the halides…”
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Interference of coexisting copper and aluminum on the ammonium thiosulfate leaching of gold from printed circuit boards of waste mobile phones by Jeon, Sanghee, Tabelin, Carlito Baltazar, Takahashi, Hirotaka, Park, Ilhwan, Ito, Mayumi, Hiroyoshi, Naoki

“…•Au extraction from waste mobile phone PCBs decreased at high S/L.•Extracted Au ions were re-deposited onto Cu and Al in PCBs by cementation.•Individually,…”
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Depression of lead-activated sphalerite by pyrite via galvanic interactions: Implications to the selective flotation of complex sulfide ores by Aikawa, Kosei, Ito, Mayumi, Segawa, Tatsuya, Jeon, Sanghee, Park, Ilhwan, Tabelin, Carlito Baltazar, Hiroyoshi, Naoki

“…[Display omitted] •Pyrite depresses the floatability of lead-activated sphalerite.•Galvanic interactions between pyrite and lead-activated sphalerite…”
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Gold recovery from shredder light fraction of E-waste recycling plant by flotation-ammonium thiosulfate leaching by Jeon, Sanghee, Ito, Mayumi, Tabelin, Carlito Baltazar, Pongsumrankul, Rongrit, Kitajima, Naho, Park, Ilhwan, Hiroyoshi, Naoki

“…[Display omitted] •Au and base metals in SLF were separately recovered by flotation.•Over 99% of Au was recovered from SLF by flotation as froth products.•Over…”
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A simple and efficient recovery technique for gold ions from ammonium thiosulfate medium by galvanic interactions of zero-valent aluminum and activated carbon: A parametric and mechanistic study of cementation by Jeon, Sanghee, Bright, Sharrydon, Park, Ilhwan, Tabelin, Carlito Baltazar, Ito, Mayumi, Hiroyoshi, Naoki

“…Cyanide- and halide-based extraction methods are the most common ways of leaching gold (Au) from Au-bearing materials, but because of the toxicity and/or…”
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Suppression of pyrite oxidation by ferric-catecholate complexes: An electrochemical study by Li, Xinlong, Gao, Min, Hiroyoshi, Naoki, Tabelin, Carlito Baltazar, Taketsugu, Tetsuya, Ito, Mayumi

“…•Mechanisms of Fe-based CME were investigated by electrochemical studies.•Decomposition potentials of Fe3+-catecholate complexes conformed with their…”
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Effects of humidity and temperature on subcritical crack growth in sandstone by Nara, Yoshitaka, Morimoto, Kazuya, Yoneda, Tetsuro, Hiroyoshi, Naoki, Kaneko, Katsuhiko

“…► Effect of humidity and temperature on crack velocity in sandstone was investigated. ► Crack velocity in sandstone increases with increasing relative…”
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Kinetic Analysis for Agglomeration-Flotation of Finely Ground Chalcopyrite: Comparison of First Order Kinetic Model and Experimental Results by Hornn, Vothy, Ito, Mayumi, Yamazawa, Ryosuke, Shimada, Hiromasa, Tabelin, Carlito Baltazar, Jeon, Sanghee, Park, Ilhwan, Hiroyoshi, Naoki

“…Particle size-flotation rate relationships can be discussed by a first-order kinetic model for flotation, which considers the probability of particle-bubble…”
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