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Effect of hydraulic retention time and pH on oxidation of ferrous iron in simulated ferruginous acid mine drainage treatment with inoculation of iron-oxidizing bacteria

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Water Science and Engineering 2019年第3期12卷 213-220页

作者： Jun-hui Fan Xing-yu Liu Qi-yuan Gu Ming-jiang Zhang Xue-wu Hu GRIMAT Engineering Institute Co. Ltd. Beijing 101407 China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China

The effect of hydraulic retention time (HRT) and pH on the biooxidation of ferrous iron during simulated acid mine drainage (AMD) treatment was *** simulated AMD was highly acidic (pH 2.5), rich in iron (about 1700 mg/L) and copper (about 200 mg/L), and contained high concentrations of sulfate (about 4700 mg/L).The biooxidation of ferrous iron was studied in a laboratory-scale upflow packed bed bioreactor (PBR).The HRT was shortened stepwise from 40 h to 20 h, 13 h, and 8 h under the acidic environment at a pH value of ***, the influent pH value was changed from 2.2 to 1.2 at a constant suitable *** and microbial community structure analyses were performed on water samples and stuffing collected from the bioreactor under different *** results indicate that the efficiency of ferrous iron oxidation gradually decreased with the decrease of HRT, and when the HRT exceeded 13 h, ferrous iron in AMD was almost completely *** addition, the best efficiency of ferrous iron oxidation was achieved at the influent pH value of *** community structure analyses show that Leptospirillum is the predominant genus attached in the bioreactor, and low influent pH values are suitable for the growth of Leptospirillum.

关键词： Acid mine drainage Iron-oxidizing bacteria Biooxidation of ferrous iron Hydraulic retention time Influent pH Microbial community analyses

Inclusion of ferrous phenanthroline in molybdenum disulfide

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Science China Chemistry 1998年第6期41卷 561-565页

作者：赵宇明袁继新杨鲁勤林建华苏勉曾 1. State Key Laboratory for Rare Earth Materials Chemistry and Applications Department of Materials Chemistry Peking University 100871 Beijing China 2. Department of Chemistry Wenzhou Normal College 325003 Wenzhou China

Intercalation compounds of ferrous phenanthroline complexes in MoS2 have been synthesized by inclusion of the intercalated species with aqueous solution of MoS2 single layers. The characterization by X-ray diffraction, elemental analysis and infrared spectroscopy indicates that the ferrous phenanthroline complexes are situated between the MoS2 layers with the three-fold axis parallel to thec-axis of Mas.

关键词： single layers MoS-2 ferrous complexes.

Resolution of siderotic glaucoma correlated with decreased pigmentation in the anterior chamber angle after removal of a retained ferrous foreign body

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International Journal of Ophthalmology(English edition) 2020年第8期13卷 1338-1339页

作者： Zhe Xu Jun-Mu Zhong Pan-Pan Ye Yao Wang Guo-Cai Lin Xiao-Yun Fang Ji-Jian Lin Zhi-Tao Su Eye Center Second Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310009Zhejiang ProvinceChina Eye Hospital Zhejiang UniversityHangzhou 310009Zhejiang ProvinceChina Department of Ophthalmology Longyan First Hospital Affiliated to Fujian Medical UniversityLongyan 364000Fujian ProvinceChina

Dear Sir,I am *** Xu,from the Eye Center,Second Affiliated Hospital,School of Medicine,Zhejiang University,Hangzhou,*** write to present a case of resolution of siderotic glaucoma after removal of a retained ferrous foreign *** study has been performed in accordance with the Declaration of Helsinki and was approved by the Ethics Committee of the Second Affiliated Hospital.

关键词： glaucoma angle ferrous

China Non-ferrous Metal Plans Alumina JV Plant in Laos

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China Chemical Reporter 2009年第33期20卷 9-9页

China Non-ferrous Metal Industry’s ForeignEngineering and Construction Co., Ltd. (NFC,SZ: 000758) said on November 10th that ithad made major progress in its bauxite projectin *** November 6th, SARCO, a 51 : 49 jointventure between NFC and Australia’s ORD,signed an agreement with Laos LSI to jointlydevelop the bauxite resource in

关键词： ferrous Alumina bauxite signed Australia alumina o

Influence of Ferric and ferrous Iron on Chemical and Bacterial Leaching of Copper Flotation Concentrates

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International Journal of Nonferrous Metallurgy 2012年第3期1卷 42-48页

作者： Ali Ahmadi Department of Mining Engineering Isfahan University of Technology Isfahan Iran

The effects of ferrous and ferric iron as well as redox potential on copper and iron extraction from the copper flotation concentrate of Sarcheshmeh, Kerman, Iran, were evaluated using shake flask leaching examinations. Experiments were carried out in the presence and absence of a mixed culture of moderately thermophile microorganisms at 50?C. Chemical leaching experiments were performed in the absence and presence of 0.15 M iron (ferric added medium, ferrous added medium and a mixture medium regulated at 420 mV, Pt. vs. Ag/AgCl). In addition, bioleaching experiments were carried out in the presence and absence of 0.1 M iron (ferric and ferrous added mediua) at pulp density 10% (w/v), inoculated bacteria 20% (v/v), initial pH 1.6, nutrient medium Norris and yeast extract addition 0.02% (w/w). Abiotic leaching tests showed that the addition of iron at low solution redox potentials significantly increased the rate and extent of copper dissolution but when ferric iron was added, despite a higher initial rate of copper dissolution, leaching process stopped. Addition of both ferrous and ferric iron to the bioleaching medium levelled off the copper extraction and had an inhibitory effect which decreased the final redox potential. The monitoring of ferrous iron, ferric iron and copper extraction in leach solutions gave helpful results to understand the behaviour of iron cations during chemical and bacterial leaching processes.

关键词： Ferric Iron ferrous Iron Copper Concentrate Leaching Redox Potential

Enrichment of Phosphate on ferrous Iron Phases during Bio-Reduction of Ferrihydrite

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International Journal of Geosciences 2012年第2期3卷 314-320页

作者： Qingman Li Xingxiang Wang Dan Kan Rebecca Bartlett Gilles Pinay Yu Ding Wei Ma Clinical Department School of Medicine Northwest University for Nationalities Lanzhou China Institute of Hydrobiology Chinese Academy of Sciences Wuhan China Institute of Soil Science Chinese Academy of Sciences Nanjing China School of Geography Earth and Environmental Sciences University of Birmingham Birmingham UK

The reduction of less stable ferric hydroxides and formation of ferrous phases is critical for the fate of phosphorus in anaerobic soils and sediments. The interaction between ferrous iron and phosphate was investigated experimentally during the reduction of synthetic ferrihydrite with natural organic materials as carbon source. Ferrihydrite was readily reduced by dissimilatory iron reducing bacteria (DIRB) with between 52% and 73% Fe(III) converted to Fe(II) after 31 days, higher than without DIRB. Formation of ferrous phases was linearly coupled to almost complete removal of both aqueous and exchangeable phosphate. Simple model calculations based on the incubation data suggested ferrous phases bound phosphate with a molar ratio of Fe(II):P between 1.14 - 2.25 or a capacity of 246 - 485 mg·P·g-1 Fe(II). XRD analysis indicated that the ratio of Fe(II): P was responsible for the precipitation of vivianite (Fe3(PO4)2·8H2O), a dominant Fe(II) phosphate mineral in incubation systems. When the ratio of Fe(II):P was more than 1.5, the precipitation of Fe(II) phosphate was soundly crystallized to vivianite. Thus, reduction of ferric iron provides a mechanism for the further removal of available phosphate via the production of ferrous phases, with anaerobic soils and sediments potentially exhibiting a higher capacity to bind phosphate than some aerobic systems.

关键词： Phosphate Iron Reduction Ferrihydrite ferrous Iron Vivianite

Hebei Iron & Steel Group to build non-ferrous metal base with focus placed on developing copper and molybdenummine

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China Nonferrous Metals Monthly 2011年第1期 4-5页

Recently, Jindi Mining Company, a company located in Dawan Mining Area, Laiyuan County, and Hebei Iron & Steel Group formally signed integration agreement and completed asset handover. By the end of the

关键词： ferrous Hebei completed formally signed asset owne

China’s Major Non-ferrous Metals Imports & Exports

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China Nonferrous Metals Monthly 2012年第11期 14-15页

Fe-MOF Derived ferrous Hierarchically Porous Carbon Used as EF Cathode for PFOA Degradation

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Journal of Geoscience and Environment Protection 2017年第6期5卷 9-14页

作者： Xiaoyu Liu Xie Quan Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education) School of Environmental Science and Technology Dalian University of Technology Dalian China

Pentadecafluorooctanoic acid (PFOA) is environmentally persistent, bioaccumulative, globally distributed and dangerous to human beings. Thus, the degradation of PFOA with effective method remains further exploration. Here, an Electro-Fenton (EF) system was studied for efficient PFOA degradation, and where a new composite material ferrous hierarchically porous carbon (FHPC) prepared by high temperature activation of MIL-100 (Fe) was applied as the cathode, and 81.4% PFOA (Initial 50 mg/L) elimination was achieved at a low potential of ?0.4 V (pH = 7, 3 h). With the increasing of the activated temperature, the catalytic ability of the materials is decreasing because the reduced surface area reduced and the iron nanoparticles size enlarged. Moreover, the H2O2 and the ?OH were also detected to confirm the dominating contribution of Electro-Fenton mechanism in the PFOA degradation. Thus, this material could be used in efficient heterogeneous EF technology for PFOA elimination.

关键词： PFOA ferrous Hierarchically Porous Carbon Electro-Fenton Degradation