Language：English   Publishing type：Research paper (international conference proceedings)  

DOI： 10.1007/978-3-031-67398-6_173

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Language：English   Publishing type：Research paper (scientific journal)  

Ferrihydrite is omnipresent in nature, and its adsorption of As(III/V) decides the migration of arsenic. Although As(III) is commonly recognized as the more mobile species of inorganic arsenic, it sometimes exhibits less mobility in ferrihydrite systems, which calls for further insights. In this study, we elucidated the adsorption behavior and mechanisms of As(III/V) on ferrihydrite under different loading levels (molar ratio As/Fe = 0-0.38), solution pH (3-10), and coexisting ions [P(V) and Ca(II)] based on batch adsorption experiments, surface complexation modeling, density functional theory calculations, and X-ray photoelectron spectroscopy. Our results show that As(III) exhibits weaker adsorption affinity but a larger capacity compared with that of As(V). On ferrihydrite, As(III) and As(V) are adsorbed mainly as bidentate mononuclear complexes at type-a sites [≡Fe(OH-0.5)2] and bidentate binuclear complexes at type-b sites (2≡FeOH-0.5), respectively. As the dosage increases, As(III) further forms mononuclear monodentate complexes at both surface sites, resulting in a higher site utilization efficiency, while As(V) does not due to repulsive electrostatic interaction. The difference in surface species of As(III/V) also leads to complex responses when coexisting with high concentrations of P(V) and Ca(II). This study helps us to understand environmental behavior of As(III/V) and develop remediation strategy in As(III/V) contaminated systems.

DOI： 10.1021/acs.est.4c05795

PubMed

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Publishing type：Research paper (scientific journal)   Publisher：Informa UK Limited  

DOI： 10.1080/00219592.2024.2366409

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Publishing type：Research paper (scientific journal)  

Conventional neutralization treatment for manganese (Mn)-bearing mine drainage provides a challenge of cost-efficiency, and new approaches should be explored for efficient removal of Mn. We focused on Mn neutralization sludge, a by-product of the Mn-bearing drainage treatment process, which was assumed to be useful as a water purification material. Mn and zinc (Zn) removal tests in simulated drainage were performed using Mn neutralization sludge, and the reaction mechanism was elucidated using geochemical modeling and X-ray absorption fine structure (XAFS) analysis. The results showed that the addition of sludge enabled to lower the Mn and Zn concentration below Japanese effluent standard (10 mg dm−3 for Mn; 2 mg dm−3 for Zn) within 1 h. Furthermore, heavy metal immobilization was achieved at neutral pH (7–8) with the sludge addition, while the conventional neutralization process without adding the sludge requires higher pH (>10) to lower Mn concentration. These removal behaviors were not explainable by considering only well-known phenomena: hydroxide precipitation, surface complexation reaction onto δ-MnO2, and autocatalytic Mn oxidation. Hence, we advanced the geochemical model for simulation, suggesting that a surface complexation reaction onto γ-MnOOH greatly contributed to the removal of Mn. Besides, Zn was calculated to be predominantly precipitated as ZnMn2O4. Solid residue analysis by XAFS measurement supported the result of above calculation, validating the reliability of the constructed geochemical model. Overall, we concluded that the advanced geochemical model would be useful in predicting the Mn and Zn behavior during mine drainage treatment with Mn neutralization sludge. Graphical abstract: (Figure presented.).

DOI： 10.1007/s11270-024-07031-6

Scopus

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Publishing type：Research paper (scientific journal)  

Ferrous sulfate (FeSO4) combined with acid pretreatment is usually employed to remediate contaminated soils containing Cr(VI). However, the long-term efficiency of this stabilization method is important for its sustainability. In this study, a gradient temperature-elevating exposure test was employed to investigate the stability of Cr in FeSO4-remediated soil when exposed to elevated temperatures (40 °C, 120 °C, and 500 °C), possibly caused by hot weather and/or wildfires. The results of chemical extraction and X-ray absorption near edge structure spectroscopy (XANES) showed that the Cr(VI) in contaminated soil was successfully transformed to Cr(III) after stabilization, resulting in the dramatic decrease of water-leachable Cr(VI). The stabilization efficiency was further improved under 40 °C treatment after 30 days. Subsequently, the 120 °C treatment (7 days) had relatively little effect on the Cr speciation and mobility in soils. However, even one day of 500 °C calcination resulted in the deterioration of stabilization efficiency, and the water-leachable Cr(VI) re-increased and became higher than the Chinese environmental standards (total Cr 15 mg/L, Cr(VI) 5 mg/L) for the classification of hazardous solid wastes. XANES results reflected that heating at 500 °C facilitate the formation of Cr2O3, which was mainly caused by thermal decomposition and dehydration of Cr(OH)3 in the soil. Besides, the transformation of Cr species resulted in the enhanced association of Cr with the most stable residual fraction (88.3%–91.6%) in soil. Based on chemical extraction results, it was suggested that the oxidation of Cr(III) to Cr(VI) contributed to the re-increased mobility of Cr(VI) in soil. However, the XANES results showed that almost no significant re-oxidization of Cr(III) to Cr(VI) happened after heating at 500 °C, which was probably caused by XANES linear combination fits (LCF) uncertainties. Moreover, the changes in soil properties, including a rise in pH to a slightly alkaline range and/or the decomposition of organic matter, possibly contributed to the enhanced mobility of Cr(VI) in soil. This study contributes to clarifying the mobility and transformation of Cr in contaminated soils and provides a support for the sustainable management of remediated soils.

DOI： 10.1016/j.jenvman.2024.120457

Scopus

PubMed

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Language：Japanese  

Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.jece.2024.112053

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Publishing type：Research paper (scientific journal)   Publisher：Japan Institute of Metals  

DOI： 10.2320/matertrans.m-m2024808

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Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

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DOI： 10.14862/geochemproc.71.0_276

CiNii Research

Language：Japanese   Publisher：GEOCHEMICAL SOCIETY OF JAPAN  

<p>Seawater is expected to be directly used as a process water for the copper ores flotation plants, where pyrite is depressed under alkaline condition (>10). However, excess alkaline agents could be consumed due to the buffering effect of seawater salts, and introducing seawater to the plant causes the generation of hydrophilic particles under the pH condition, resulting in a decrease in the recovery of valuable minerals. This study investigated the potential effect of hydrophilization on pyrite and chalcopyrite surface by promoting oxidative dissolution and bacterial adhesion using two strains of marine iron-oxidizing bacteria (<i>Thalassospira</i> sp., <i>Mariprofundus</i> sp.). We observed selective adhesion of hydrophilic bacterial cell on pyrite surface but little difference in the chemical properties on the pyrite surface by bacterial reaction. Therefore, the hydrophilic/hydrophobic property of marine iron-oxidizing bacterial cell is a significant controlling factor of flotation behavior in seawater.</p>

DOI： 10.14862/geochemproc.71.0_270

CiNii Research

Publishing type：Research paper (scientific journal)   Publisher：The Resources Processing Society of Japan  

DOI： 10.4144/rpsj.71.75

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Mining and Materials Processing Institute of Japan  

Investigation of liberation mechanism of electronic scrap by impact energy measurements and DEM simulations

DOI： 10.2473/journalofmmij.139.52

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

DOI： 10.1016/j.apt.2023.104227

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：The Society of Powder Technology, Japan  

A sulfidation process for recovering Ni from an acidic spent catalyst, and the chemical characterization of the sulfide precipitates

DOI： 10.4164/sptj.60.600

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

DOI： 10.1007/s40831-023-00754-6

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Other Link： https://link.springer.com/article/10.1007/s40831-023-00754-6/fulltext.html

Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Ciprofloxacin (CIP), a compound with bioaccumulation toxicity and antibiotic resistance, is frequently detected in water at alarming concentrations, which is becoming an increasing concern. In this study, a low-cost ceramsite was developed from industrial solid wastes through sintering to remove CIP from wastewater. The effects of adsorbent dosage, initial pH, contact time, initial CIP concentration, and temperature were explored. More than 99% of CIP (20–60 mg/L) was removed at around pH 2–4 by the ceramsite. The kinetic data fitted well with the pseudo-second-order model, revealing that chemisorption was the main rate-determining step. The isotherm data was better described by the Freundlich model, suggesting that CIP was removed by the formation of multiple layers on the heterogeneous surface. Moreover, the removal efficiency was practically higher than 95% during five regeneration cycles, when different regeneration methods were used, including calcination, HCl, and NaOH washing, indicating that the ceramsite exhibited outstanding reusability in removing CIP. The primary mechanism of CIP removal by the ceramsite was found to be the synergism of adsorption and flocculation, both of which depended on the release of Ca2+ from the ceramsite. In addition, strong Ca-CIP complexes could be formed through surface complexation and metal cation bridging between Ca2+ and different functional groups in CIP.

DOI： 10.3390/ijerph20065042

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Language：Others   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

Cadmium (Cd), as a type of heavy metal, can increase the incidence of many diseases, even in low concentrations. In this study, tobermorite was hydrothermally synthesized and then applied to adsorb Cd2+ from an aqueous solution. The physicochemical characteristics of the synthesized tobermorite were detected, and the results indicated that the well-crystallized tobermorite had a lot of mesopores and a large specific surface area of 140.92 m2/g. It acquired a pH self-adjustment ability via spontaneously releasing Ca2+ and OH- into the aqueous solution. The effects of different factors on Cd2+ removal were investigated. For Cd2+, the removal efficiency could reach 99.71% and the maximum adsorption capacity was 39.18 mg/g using tobermorite. The adsorption data was best fitted with the pseudo-second-order kinetic and Langmuir isotherm models. In addition, there was no strict limit on the solution pH in Cd2+ adsorption because the tobermorite could adjust the solution pH to an alkaline atmosphere spontaneously. The efficient removal of Cd2+ using tobermorite was a result of surface complexation and ion exchange.

DOI： 10.3390/ma16031314

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI AG  

A passive treatment process using sulfate-reducing bacteria (SRB) is known to be effective in removing heavy metals from acid mine drainage (AMD), though there has been little discussion of the mechanism involved to date. In this work, a sulfate-reducing column test was carried out using supplementary ethanol as an electron donor for microorganisms, and the reaction mechanism was examined using geochemical modeling and X-ray absorption fine structure (XAFS) analysis. The results showed that Cu was readily removed from the AMD on the top surface of the column (0–0.2 m), while Zn and Cd depletion was initiated in the middle of the column (0.2–0.4 m), where sulfide formation by SRB became noticeable. Calculations by a developed geochemical model suggested that ethanol decomposition by aerobic microbes contributed to the reduction of Cu, while sulfide produced by SRB was the major cause of Zn and Cd removal. XAFS analysis of column residue detected ZnS, ZnSO4 (ZnS oxidized by atmospheric exposure during the drying process), and CuCO3, thus confirming the validity of the developed geochemical model. Based on these results, the application of the constructed geochemical model to AMD treatment with SRB could be a useful approach in predicting the behavior of heavy metal removal.

DOI： 10.3390/ma16030928

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Publishing type：Research paper (international conference proceedings)  

The recovery of carbon fiber (CF) from wasted carbon fiber reinforced plastic (CFRP) composites and the reuse of CF have been also required in the resource recycling. The previous study of recovery CF using the torrefaction reported that 15-50 % reduction in tensile strength of recovered CF compared to virgin CF. It is necessary to develop the recovery technology of CF from CFRP without reducing tensile strength of recovered CF. In this study, we evaluate the applicability of pulsed discharge with instantaneous high energy releases as a novel approach, which is already known to be effective in separating cathode particles from aluminum foil of lithium-ion batteries (LiBs) based on our previous investigation. The separation of cathode particles was caused in the interface between the foil and particles by deactivating adhesive strength of binder which connected these due to the Joule heating of the foil generated by the current of discharge. The object of this study is to applicate pulsed discharge to recover CF without attaching polymer matrix from laminated CFRP with delaminating CFRP layers by loading discharge horizontally. The tested sample sizes of laminated CFRP were 100 mm length, 30 mm width and 8 mm thickness. Two electrodes of pulsed discharge were set on the surface of sample, and the electrode gap was 50 mm. The pulsed discharge with conditions of capacitor capacity of 80 μF, charging voltage of 10 kV and charging energy in the capacitor of 4000 J was performed in the water. The CFRP layer was peeled, and fibers about 20 mm length were also recovered by the discharge. The scanning electron microscope (SEM) images for recovered fibers indicated that fibers were without the adhesion of matrix resin. It was assumed that the separation mechanism of resin from CFRP was that the insulation breakdown in resin was caused by the discharge, and the resin was removed by the plasmatization with high temperature, resulting in the recovery of CF. It is possible to consider that the volume expansion of resin induced by the plasmatization also caused the peeling of CFRP layer. The tensile strength of recovered CF was found to be 5.0 GPa by the single fiber tensile test and was 21 % less than that of the virgin one. These results indicated that pulsed discharge is effective in the recovery of CF from the laminated CFRP with the less tensile strength reduction of recovered CF.

DOI： 10.1109/PPC47928.2023.10310873

Scopus

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Publishing type：Research paper (scientific journal)   Publisher：The Resources Processing Society of Japan  

DOI： 10.4144/rpsj.70.65

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Language：English   Publishing type：Research paper (scientific journal)   Publisher：MDPI  

Bioleaching of arsenic (As)-rich, so-called "dirty" concentrates can produce additional Cu value from the flotation waste while simultaneously releasing toxic As. This study bioleached three such concentrates of varying pyrite/enargite ratios ([Py]/[Ena] = 0.7, 1.3 and 2.4) at a pulp density of 20%. The dissolution behavior of Cu and As in relation to the solution redox potential (Eh) was studied with and without activated carbon (AC) as a potential Eh-controlling catalyst. At this high pulp density, Eh was naturally suppressed, without a need for AC dosing, to <700 mV (a rapid pyrite dissolution is prevented in this Eh range). The effect of AC dosing on Eh varied depending on the type of concentrate; Eh was further reduced only in the case of the most enargite-rich concentrate, DC-I. Among the three concentrates, the highest Cu dissolution (35%) was seen in DC-I (without AC dosing), which simultaneously achieved the lowest As solubilization. Arsenic was immobilized as amorphous precipitates, likely in a mixture of ferric arsenate, cupric arsenate, basic ferric sulfate and sulfur. Arsenic immobilization became increasingly ineffective as the pyrite content increased in the concentrate. Based on these results, setting a lower [Py]/[Ena] ratio prior to the dirty concentrate bioleaching could be a useful approach to promote Cu dissolution and As immobilization simultaneously.

DOI： 10.3390/min12040449

Web of Science

Scopus

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Language：Japanese   Publisher：The Resources Processing Society of Japan  

<p>Arsenic removal from copper ores/concentrates is one of the most important issue in mining industries. Under the national project led by JOGMEC, Kyushu University and Sumitomo Metal Mining Co. Ltd. has carried out systematic research on the arsenic removal from copper concentrates, including the heat treatment-magnetic separation, flotation and bioleaching. The flotation studies were carried out mainly on chalcopyrite as a main copper sulfide and enargite as an arsenic containing copper sulfide. Enargite was separated from chalcopyrite by flotation by combining potassium amyl xanthate (PAX) and hydrogen peroxide. The resultant arsenic-rich “dirty” concentrates and/or arsenic-containing copper concentrates were subjected to the magnetic separation as well as bioleaching processes. After the heat treatment, chalcopyrite exhibited magnetic property whereas enargite did not. This difference enabled the magnetic separation of the two minerals. Bioleaching was carried out with the addition of activated carbon to improve the copper dissolution as well as As immobilization.</p>

DOI： 10.4144/rpsj.68.124

CiNii Research

Language：English   Publishing type：Research paper (scientific journal)  

Overcoming the slow-leaching kinetics of refractory primary copper sulfides is crucial to secure future copper sources. Here, the effect of carbon was investigated as a catalyst for a bioleaching reaction. First, the mechanism of carbon-assisted bioleaching was elucidated using the model chalcopyrite mineral, under specified low-redox potentials, by considering the concept of E-normal. The carbon catalyst effectively controlled the E-h level in bioleaching liquors, which would otherwise exceed its optimal range (0 <= E-normal <= 1) due to active regeneration of Fe3+ by microbes. Additionally, E-normal of similar to 0.3 was shown to maximize the carbon-assisted bioleaching of the model chalcopyrite mineral. Secondly, carbon-assisted bioleaching was tested for three types of chalcopyrite/enargite-bearing complex concentrates. A trend was found that the optimal E-h level for a maximum Cu solubilization increases in response to the decreasing chalcopyrite/enargite ratio in the concentrate: When chalcopyrite dominates over enargite, the optimal E-h was found to satisfy 0 <= E-normal <= 1. As enargite becomes more abundant than chalcopyrite, the optimal E-h for the greatest Cu dissolution was shifted to higher values. Overall, modifying the E-h level by adjusting AC doses to maximize Cu solubilization from the concentrate of complex mineralogy was shown to be useful.

DOI： 10.3390/min11040432

Language：English   Publishing type：Research paper (scientific journal)  

The catalytic mechanism of activated carbon-assisted bioleaching of enargite concentrate (enargite 37.4&#37;; pyrite 47.3&#37;) was investigated by employing microbiological, electrochemical and kinetic studies. By using moderately thermophilic microorganisms at 45 degrees C, the final Cu dissolution was improved from 36&#37; to 53&#37; at 0.2&#37; (w/v) activated carbon. An excess activated carbon addition showed an adverse effect. The enargite mineral itself favored higher solution redox potential (E-h) for solubilization. However, the dissolution of co-existing pyrite, which also favors high E-h, immediately hindered enargite dissolution through the passivation effect. The surface of activated carbon functioned as an electron mediator to couple RISCs oxidation and Fe3+ reduction, so that elevation of the E-h level was controlled by offsetting microbial Fe3+ regeneration. As long as the E-h level was suppressed at < 700 mV, the dissolution of pyrite was largely avoided, enabling a steady and continuous dissolution of the enargite mineral through the surface chemical reaction model. When the E-h-control by activated carbon becomes no longer sustainable and the E-h hits 700 mV, rapid pyrite dissolution was initiated and the surface chemical reaction of enargite dissolution came to an end. Arsenic species dissolved from enargite was constantly immobilized with an efficiency of 75-90&#37; as amorphous ferric arsenate. However, the sudden initiation of pyrite dissolution also triggered the re-solubilization of ferric arsenate. Therefore, the sustainable E-h-controlling effect was shown to be critical to enable longer Cu dissolution from enargite as well as stabilization of As precipitates.

DOI： 10.1016/j.hydromet.2020.105417

Language：Others   Publishing type：Research paper (scientific journal)  

Chile and Indonesia, as a mining-developed country and a mining-developing country, respectively, are compared to estimate the future applicability of bioleaching technique into real operation. Chilean copper industry has improved via the following steps: (i) domination by foreign capitals, (ii) resource nationalization, (Chilenization), (iii) lost competitiveness due to the decrease in the ore-grade, (iv) the invitation of foreign capitals to regain the competitiveness. Indonesia takes the same path and it was easily predicted that Indonesian copper mining industry is also likely to loose the competitiveness due to the decrease in ore-grade. Therefore, the installation of bioleaching would be proposed for further development of Indonesian copper industry.

Language：English   Publishing type：Research paper (scientific journal)  

Effect of silver (Ag) catalyst in bioleaching of enargite (Cu3AsS4) concentrate was studied using mixed cultures of moderately thermophilic acidophilic microorganisms at 45 degrees C. Addition of Ag2S enabled selective Cu dissolution from enargite while suppressing pyrite oxidation: At the highest Ag2S concentration of 0.04&#37;, Cu recovery reached 96&#37; while Fe dissolution was suppressed to reach only 29&#37; by day 72. Overall results from thermodynamic calculation, liquid/solid analyses and kinetic study suggested that Ag-catalyzed bioleaching of enargite concentrate proceeds via formation of at least two types of secondary products (chalcocite, Cu2S; trisilver arsenic sulfide, Ag3AsS4): Addition of Ag2S as Ag catalyst thermodynamically and microbiologically contributed to lowering solution redox potentials during bioleaching, consequently satisfying E-ox (Cu2S) < Eh < E-c (Ag+) to enhance enargite dissolution via formation of chalcocite intermediate. Formation of trisilver arsenic sulfide and its intermediate layer (Cu,Ag)(3)AsS4 indicated that Cu ion in the enargite lattice is gradually substituted with Ag. Such secondary products did not impose a rate-limiting step, since the Ag-catalyzed bioleaching was shown to be controlled by a chemical surface reaction, rather than diffusion through product film which was the case in the absence of Ag2S.

DOI： 10.1016/j.hydromet.2018.03.014

Language：Others   Publishing type：Research paper (other academic)  

Silver-catalyzed bioleaching of enargite concentrate with three bacteria (Acidimicrobium ferrooxidans ICP, Sulfobacillus sibiricus N1, Acidithiobacillus caldus KU) and one archaeon (Ferroplasma acidiphilum Y) was conducted in order to elucidate the catalytic mechanism of silver sulfide in enargite bioleaching. Whereas Cu recovery remained relatively low (43&#37;) and Fe dissolved completely without silver sulfide, Cu recovery was greatly enhanced (96&#37;) and Fe dissolution was suppressed (29&#37;) in the presence of 0.04&#37; silver sulfide. In the latter case, 52&#37; of the solubilized As was re-immobilized, in contrast to only 14&#37; As re-immobilization in the former. The silver-catalyzed bioleaching (at 0.04&#37; silver sulfide) proceeded at low redox potentials within the optimal range, which likely promoted enargite dissolution via formation of intermediate Cu S. XAFS analysis revealed that As was mainly immobilized as As(V), which was in agreement with the EPMA results detecting ferric arsenate passivation on some enargite grains. Furthermore, formation of trisilver arsenic sulfide (Ag AsS ) was detected by XRD and EPMA, covering the surface of enargite particles. An intermediate layer, consisting of (Cu,Ag) AsS , was also observed between the enargite grain and trisilver arsenic sulfide layer, implying that Cu in enargite may be gradually substituted by solubilized Ag. Kinetic study suggested that these secondary minerals do not rate-limit the enargite dissolution. The overall mechanism of silver-catalyzed bioleaching of enargite concentrate will be proposed. 2 3 4 3 4

DOI： 10.4028/www.scientific.net/SSP.262.273

Event date： 2023.6

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Event date： 2023.6

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Event date： 2022.12

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Event date： 2022.11

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Event date： 2022.11

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Event date： 2022.10 - 2022.11

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Suitalbe Eh-lowering activated carbon in bioleaching of enargite concentrate

Event date： 2022.10 - 2022.11

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Evaluation of the long-term chemical stability of adsorbed Hg on pyrite surfaces under various redox and pH conditions

Event date： 2022.10 - 2022.11

Language：English   Presentation type：Oral presentation (general)  

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Event date： 2022.10 - 2022.11

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.9

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Event date： 2022.8

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Event date： 2022.8

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Event date： 2022.8

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Event date： 2022.8

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Event date： 2022.3

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Development of pyrite depression technique using marine Fe-oxidizing bacteria in flotation process of valuable metal sulfide ore

Event date： 2022.3

Presentation type：Oral presentation (general)  

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Event date： 2021.3

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Study on activated carbon-assisted bioleaching of arsenic-containing primary copper sulfide concentrates

Event date： 2020.3

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Evaluation of the effect of activated carbon on bioleaching of refractory primary copper

Event date： 2020.3

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Carbon-assisted bioleaching of refractory primary copper sulfides and its mechanism

Event date： 2019.3

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The catalytic mechanism of carbon material in chalcopyrite bioleaching

Event date： 2018.9

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Effect of silver and activated carbon on enargite bioleaching using extremely acidophilic microorganisms

Event date： 2018.9

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Effect of activated carbon as a catalyst for bioleaching of enargite concentrate

Event date： 2018.9

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Effect of NaCl addition on redox potential control and copper dissolution behavior during chalcopyrite bioleaching

Event date： 2018.3

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Evaluating the catalytic effect of activated carbon on bioleaching of enargite concentrate

Event date： 2017.3

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Investigating the mechanism of silver-catalyzed enargite bioleaching

Event date： 2016.3

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Effect of silver catalyst on bioleaching of enargite

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Carbon-assisted bioleaching of primary copper sulfides

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Comparison on the catalytic mechanism of activated carbon in bioleaching of chalcopyrite and enargite

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Carbon-assisted bioleaching of chalcopyrite concentrate

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Evaluation of catalytic effect of activated carbon on enargite bioleaching

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Catalytic effect of activated carbon on bioleaching of enargite concentrate

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Mechanism of silver-catalyzed bioleaching of enargite concentrate

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Investigating catalytic effect of silver on bioleaching of enargite concentrate

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Selective bioleaching of enargite (Cu3AsS4) over pyrite (FeS2) for Cu recovery

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