Search Results - "Tsuyoshi Hirajima"

Comparison of effectiveness of citric acid and other acids in leaching of low-grade Indonesian saprolitic ores by Astuti, Widi, Hirajima, Tsuyoshi, Sasaki, Keiko, Okibe, Naoko

“…•Comparison of effectiveness of some acids on nickel leaching of saprolitic ores was studied.•Leaching performances depend significantly on the mineral…”
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Floatability of molybdenite and chalcopyrite in artificial seawater by Suyantara, Gde Pandhe Wisnu, Hirajima, Tsuyoshi, Miki, Hajime, Sasaki, Keiko

“…[Display omitted] •Artificial seawater was used as seawater model solution.•Artificial seawater reduces the floatability of molybdenite and chalcopyrite at pH…”
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Effect of H2O2 and potassium amyl xanthate on separation of enargite and tennantite from chalcopyrite and bornite using flotation by Suyantara, Gde Pandhe Wisnu, Hirajima, Tsuyoshi, Miki, Hajime, Sasaki, Keiko, Kuroiwa, Shigeto, Aoki, Yuji

“…[Display omitted] •H2O2 and PAX are used in flotation of copper sulfide and arsenic-bearing copper minerals.•Selective flotation of these minerals is possible…”
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Effect of Mg2+ and Ca2+ as divalent seawater cations on the floatability of molybdenite and chalcopyrite by Hirajima, Tsuyoshi, Suyantara, Gde Pandhe Wisnu, Ichikawa, Osamu, Elmahdy, Ahmed Mohamed, Miki, Hajime, Sasaki, Keiko

“…[Display omitted] •MgCl2 and CaCl2 reduce the floatability of molybdenite and chalcopyrite at pH>9.•Depressing effect of Mg2+ and Ca2+ ions is proportional to…”
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Characterization of the intermediate in formation of selenate-substituted ettringite by Guo, Binglin, Sasaki, Keiko, Hirajima, Tsuyoshi

“…Precipitation of SeO42−-substituted ettringite is an efficient method to immobilize SeO42− under alkaline conditions. The effect of SO42− on SeO42−…”
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Surfactant-modified montmorillonite by benzyloctadecyldimethylammonium chloride for removal of perchlorate by Luo, Wuhui, Sasaki, Keiko, Hirajima, Tsuyoshi

“…[Display omitted] •The benzene ring and long alkyl chain facilitated the ClO4- uptake using BODMA-MMT.•The maximum adsorption capacity of 0.9mmol/g for ClO4-…”
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Synergistic effect of Sr2+ and ReO4− adsorption on hexadecyl pyridinium-modified montmorillonite by Luo, Wuhui, Inoue, Akihiro, Hirajima, Tsuyoshi, Sasaki, Keiko

“…[Display omitted] •Simultaneous adsorption of Sr2+ and ReO4− on HDPy–modified Mt was studied.•Considerable adsorption capacities of Sr2+ and ReO4− were…”
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Effect of Na2SO3 on the floatability of chalcopyrite and enargite by Suyantara, Gde Pandhe Wisnu, Hirajima, Tsuyoshi, Miki, Hajime, Sasaki, Keiko, Kuroiwa, Shigeto, Aoki, Yuji

“…[Display omitted] •The effect of Na2SO3 on the floatability of chalcopyrite and enargite was studied.•Na2SO3 treatment depressed the floatability of both…”
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Selective Flotation of Copper Concentrates Containing Arsenic Minerals Using Potassium Amyl Xanthate and Oxidation Treatment by Suyantara, Gde Pandhe Wisnu, Miki, Hajime, Hirajima, Tsuyoshi, Sasaki, Keiko, Ochi, Daishi, Aoki, Yuji

“…This study investigated the effects of potassium amyl xanthate (KAX) and oxidation treatment using hydrogen peroxide (H2O2) on the selective flotation of…”
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Upgrading of low rank coal and woody biomass mixture by hydrothermal treatment by Nonaka, Moriyasu, Hirajima, Tsuyoshi, Sasaki, Keiko

“…► Hydrothermal treatment of low rank coal and woody biomass mixture. ► Results by a bench scale continuous apparatus are predictable from a batch test. ► The…”
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Effect of Fenton-like oxidation reagent on hydrophobicity and floatability of chalcopyrite and molybdenite by Suyantara, Gde Pandhe Wisnu, Hirajima, Tsuyoshi, Miki, Hajime, Sasaki, Keiko, Yamane, Masashi, Takida, Eri, Kuroiwa, Shigeto, Imaizumi, Yuji

“…[Display omitted] •Fenton-like reagent was made by the addition of FeSO4 in H2O2 solution in this study.•The Fenton-like reagent was used for oxidation…”
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Experimental study on freeze drying of Loy Yang lignite and inhibiting water re-adsorption of dried lignite by Liu, Xiangchun, Hirajima, Tsuyoshi, Nonaka, Moriyasu, Sasaki, Keiko

“…[Display omitted] •Lignite was dewatered using freeze drying (FD).•MHC of FD treated sample was lower than that of raw lignite.•Coating kerosene by adsorption…”
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Effect of pH and Precipitations on Copper–Molybdenum Rougher Flotation in Seawater by Tanaka, Yoshiyuki, Miki, Hajime, Suyantara, Gde Pandhe Wisnu, Aoki, Yuji, Okamoto, Hideyuki, Ura, Kumika, Hirajima, Tsuyoshi

“…Effect of pH and precipitations on copper–molybdenum ore rougher flotation has been investigated in seawater with flotation experiments followed by…”
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Solidification of ettringite after uptaking selenate as a surrogate of radionuclide in glass-ceramics by using industrial by-products by Guo, Binglin, Sasaki, Keiko, Hirajima, Tsuyoshi

“…After accumulation of toxic ions from a contaminated source, spent absorbents and coprecipitation sludge should be stabilized before landfilling for long time…”
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Selective adsorption of inorganic anions on unwashed and washed hexadecyl pyridinium-modified montmorillonite by Luo, Wuhui, Hirajima, Tsuyoshi, Sasaki, Keiko

“…[Display omitted] •HDPy/Mt showed more favorable performance to monovalent anions than the divalent.•Unwashed HDPy/Mt showed higher selectivity to monovalent…”
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Comparison of atmospheric citric acid leaching kinetics of nickel from different Indonesian saprolitic ores by Astuti, Widi, Hirajima, Tsuyoshi, Sasaki, Keiko, Okibe, Naoko

“…Saprolitic ores from Sulawesi Island (SS ore) contain serpentine and goethite as major minerals, whereas the main minerals in saprolitic ore from Halmahera…”
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Influence of the pre-dispersion of montmorillonite on organic modification and the adsorption of perchlorate and methyl red anions by Luo, Wuhui, Sasaki, Keiko, Hirajima, Tsuyoshi

“…In this study, hexadecyl pyridinium chloride (HDPy-Cl) was applied to modify powdery and dispersed montmorillonite (pMt and dMt, respectively). Then,…”
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Effect of sodium metabisulfite and slaked lime on the floatability and surface properties of chalcopyrite by Suyantara, Gde Pandhe Wisnu, Semoto, Yuki, Miki, Hajime, Hirajima, Tsuyoshi, Sasaki, Keiko, Ochi, Daishi, Aoki, Yuji, Berdakh, Daniyarov, Ura, Kumika

“…In the flotation of complex copper ores containing chalcopyrite in seawater, sodium metabisulfite (SMBS) has been widely used as a pyrite depressant. Here,…”
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Optimization of hexadecylpyridinium-modified montmorillonite for removal of perchlorate based on adsorption mechanisms by Luo, Wuhui, Hirajima, Tsuyoshi, Sasaki, Keiko

“…Adsorption of perchlorate (ClO4−) onto hexadecylpyridinium-modified montmorillonite (OMt) was investigated by in situ and ex situ methods. For the in situ…”
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Effect of calcination temperature on Mg-Al bimetallic oxides as sorbents for the removal of F- in aqueous solutions by MORIYAMA, Sayo, SASAKI, Keiko, HIRAJIMA, Tsuyoshi

“…Bimetallic oxides were synthesized from hydrotalcite using increasing calcination temperatures (873, 1073, 1273 K). These bimetallic oxides were fully…”
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