A study of the mechanical properties, environmental effect, and microscopic mechanism of phosphorus slag-based uranium tailings backfilling materials
作者：
Zhang, Xiao;Xue, Xilong;Ding, Dexin;Sun, Pengcheng;Li, Jiale;...
期刊：
Journal of Cleaner Production ,2024年446:141306 ISSN：0959-6526
通讯作者：
Xue, XL
作者机构：
[Zhang, Xiao; Ding, Dexin] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Xiao; Ding, Dexin; Sun, Pengcheng; He, Yan; Xue, Xilong; Li, Jiale] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Xue, Xilong] Jinchuan Grp Co Ltd, Ni&Co Associated Minerals Resources Dev & Comprehe, Natl Key Lab, Jinchang 737100, Gansu, Peoples R China.;[Xue, Xilong; Xue, XL] Safety Engn Univ South China, Sch Resources Environm, 28 Changsheng west Rd, Hengyang 421001, Peoples R China.
通讯机构：
[Xue, XL ] S;Safety Engn Univ South China, Sch Resources Environm, 28 Changsheng west Rd, Hengyang 421001, Peoples R China.
关键词：
Binders;Carbon dioxide;Cements;Cost effectiveness;Fluidity;Hydration;Leaching;Mining;Phosphorus;Slags;Uranium;Cemented backfill;Effect mechanism;Heap leaching;Heap leaching urania tailing;Leaching behavior;Microscopic mechanisms;Occurrence form;Phosphorus slag;Radon exhalation rate;Setting time;Blending
摘要：
Heap leaching uranium tailings (HLUTs) contain radionuclides and sulfuric acid, presenting some challenges for the disposal of cemented HLUTs backfill (CUTB), including low stability and potential environmental contamination. In light of these issues, using a blend of cement clinker (CL) and high content phosphorus slag (PS) as binders to replace traditional cement for the preparation of green and cost-effective CUTB were proposed. The fluidity, setting time (ST), mechanical properties, Radon (Rn) exhalation rate, uranium (U) occurrence form, U (Ⅵ) leaching behavior, and microstructure of CUTB with different PS contents were investigated. The results showed that the fluidity, bleeding rate and ST of slurry (PS content >40%) met the filling requirements. The strength of PS-based CUTB was initially low, but rapidly increased in subsequent periods, surpassing 2 MPa at 28 d and 4.5 MPa at 90 d (with 50–70% PS content). Moreover, the Rn exhalation rates and U (Ⅵ) leaching levels of CUTB were far lower than the stipulated limits. When PS content exceeded 50%, the migratory uranium content in CUTB was below 10% with low migration risks. With the addition of PS, the amount and degree of polymerization of C–S–H gels in the matrix increased, while gypsum and CH content decreased. The S/S of U (Ⅵ) and SO42− was attributed to the combined effects of chemical immobilization of nascent minerals and physical adsorption/encapsulation of hydration products. Additionally, these hydrates effectively sealed micro-cracks on HLUTs particles surfaces and filled interlocking pores to decrease Rn exhalation. PS-based CUTB exhibited a high capacity increasing ratio and low cost. This research can promote the utilization of hazardous solid wastes such as HLUTs, reduce carbon dioxide emissions, and provide a theoretical basis for ensuring green and safe production in mining. © 2024 Elsevier Ltd
语种：
英文
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Hyphae and organic acids of Aspergillus Niger promote uranium recovery by destroying the ore surface and increasing the porosity and permeability of ores
作者：
Wang, Yongdong;Wang, Jinhua;Ding, Dexin;Li, Guangyue;Sun, Jing;...
期刊：
Nuclear Engineering and Technology ,2024年56(5):1880-1886 ISSN：1738-5733
通讯作者：
Wang, YD
作者机构：
[Ding, Dexin; Zhang, Hui; Wang, Jinhua; Li, Guangyue; Dai, Zhongran; Li, Feng; Hu, Nan; Sun, Jing; Ma, Jianhong; Ding, Yang; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, YD ] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Hunan, Peoples R China.
关键词：
Aspergillus Nige;Bioleaching;Uranium ore;Exfoliation;Proton exchange
摘要：
To elucidate the mechanism of damage caused by hyphae and organic acids produced by Aspergillus Niger on the surface and internal structure of uranium ore, direct uranium leaching, indirect uranium leaching and semi-direct uranium leaching were conducted, and the surface morphology, strength, mineral crystallinity, porosity, and permeability of the ore were analyzed. The results demonstrated that the combination of biomechanical forces exerted by hyphae and the complexation effects of organic acids led to the dissolution of SiO2 and other substances on the surface of ore, resulting in exfoliation from the exterior to the interior, thereby promoting uranium recovery. Furthermore, the proton exchange involving H+ and the complexation of organic acids resulted in the dissolution of cations within the ore, causing destruction to the crystal lattice structure of minerals and increasing the porosity and permeability inside the ore. The dominant factor contributing to ore damage during recovery was organic acids. © 2023 Korean Nuclear Society
语种：
英文
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三维电场强化博落回修复铀污染土壤试验研究
作者：
刘骞;曾祥宇;丁德馨;马建洪#&#&#Liu Qian;Zeng Xiangyu;...
期刊：
黄金 ,2024年45(8):112-116 ISSN：1001-1277
作者机构：
[曾祥宇; Ma Jianhong; 刘骞; 丁德馨] 南华大学资源环境与安全工程学院;[曾祥宇; Ma Jianhong; 刘骞; 丁德馨] 南华大学铀矿冶生物技术国防重点学科实验室
关键词：
三维电场;植物修复;博落回;铀污染;土壤;生物修复
摘要：
通过盆栽试验研究了三维电场对博落回修复铀污染土壤性能的强化作用.结果表明:与二维电场相比,三维电场与博落回耦合可使博落回地上和地下部分铀质量分数分别提高17.14％和43.3％,干生物量分别提高40.4％和37.6％,土壤中可交换态铀石比提高10百分点,改变了博落回体内铀的亚细胞分布,增加了铀在博落回体内的积累,促进铀向博落回细胞器内转移,其中茎部铀的转移更为明显.三维电场可进一步强化博落回对铀污染土壤的修复作用,是一种具有潜在应用前景的强化植物修复方法.
语种：
中文
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背景地下水作用下铀在砂岩铀矿微界面上的扩散模式
作者：
杨迎春;丁洋;周函;丁德馨;姜瑭
期刊：
有色金属(矿山部分) ,2024年76(1):107-113 ISSN：1671-4172
作者机构：
南华大学 资源环境与安全工程学院,湖南 衡阳 421001;南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001;[丁洋; 姜瑭; 丁德馨; 杨迎春; 周函] 南华大学
关键词：
酸法地浸;铀污染地下水;自然修复;微界面;膜扩散;颗粒内扩散
摘要：
上游背景地下水流入酸法地浸采铀退役采区地下水中时产生了稀释和冲洗作用。为探究背景地下水作用下酸法地浸退役采区地下水中铀在水岩微界面上的扩散模式和控制机理,开展了静态稀释实验和动态冲洗实验。静态稀释实验结果显示,背景地下水...展开更多 上游背景地下水流入酸法地浸采铀退役采区地下水中时产生了稀释和冲洗作用。为探究背景地下水作用下酸法地浸退役采区地下水中铀在水岩微界面上的扩散模式和控制机理,开展了静态稀释实验和动态冲洗实验。静态稀释实验结果显示,背景地下水与污染地下水比例为50∶1时,1440 min内铀浓度降到背景值60μg/L以下;初期阶段(0~20 min),反应速率主要受膜扩散控制;中期阶段(20~150 min),反应速率受膜扩散和颗粒内扩散共同控制;后期阶段(150~600 min),反应速率主要受颗粒内扩散控制。动态冲洗实验结果表明,用25个孔隙体积的背景地下水,10 d内铀浓度降至50μg/L;初期阶段(0~4 d),反应速率主要受膜扩散控制;中期阶段(4~7 d),反应速率同时受膜扩散与颗粒内扩散控制;后期阶段(7~10 d),反应速率主要受颗粒内扩散控制。这些研究结果揭示了上游背景地下水流入酸法地浸采铀退役采区地下水中后铀的扩散和迁移规律,为酸法地浸采铀退役采区地下水自然净化的可行性评估提供了理论依据。收起
语种：
中文
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Unraveling response mechanism of electron transport mechanism to uranium-exposure in Bacillus sp. X02
作者：
Yi, Haitao;Zou, Chao;Ding, Dexin;Li, Guangyue;Wang, Jinhua;...
期刊：
Journal of Water Process Engineering ,2024年58:104796 ISSN：2214-7144
通讯作者：
Wang, YD
作者机构：
[Ding, Dexin; Zou, Chao; Li, Guangyue; Wang, Jinhua; Li, Aishu; Yi, Haitao; Wang, Yongdong] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Heng Yang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, YD ] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Heng Yang 421001, Hunan, Peoples R China.
关键词：
Electron transfer mechanism;U(VI) bioreduction;Cytochrome c;Oxidative phosphorylation;Bacillus sp. X02
摘要：
With the development of the uranium mining industry, the remediation of uranium pollution is an urgent environmental problem to be solved. Bioreduction is currently recognized as a U(VI) bioremediation method with good application prospects. However, inadequate reporting of uranium-reducing bacteria and low bioreduction efficiency are the main reasons limiting the application of the bioreduction method. In this paper, we isolated an efficient uranium-reducing bacterium, Bacillus sp. X02, explored the effect of U(VI) on bioreduction efficiency through electron transport mechanisms. The results showed that the maximum removal and reduction rate were 98.35 % and 62.43 %, respectively. Further studies revealed that the efficiency of extracellular electron transport of Bacillus sp. X02 was enhanced under U(VI) exposure. But uranium stress down-regulated the expression of F-type ATPase, Cytochrome c reductase ISP, Cytochrome c oxidase, and Cytochrome bd complex, inhibited the processes of complex III, complex IV, and ATP synthesis in the oxidative phosphorylation electron transport pathway, decreasing the electron transfer and U(VI) reduction capacity of Bacillus sp. X02 ultimately. This work proposed a new electron transfer pathway for U(VI) bioreduction and provided new insights into the effect of uranium on bioreduction efficiency. © 2024 Elsevier Ltd
语种：
英文
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Circulating adsorption-desorption properties and kinetic analysis of uranium by strong basic anion resins [强碱性阴离子树脂对铀的循环吸附-淋洗性能及动力学分析]
作者：
刘玉龙;胡南;陈祥标;陈森才;曾冰勇;...
期刊：
化工进展 ,2023年42(10):5574-5583 ISSN：1000-6613
作者机构：
[胡南; 陈祥标; 丁德馨] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hunan, Hengyang, 421001, China;[陈森才; Zeng B.] China General Nuclear Power Group Uranium Resources Co., Ltd., Beijing, 100029, China;[刘玉龙] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hunan, Hengyang, 421001, China<&wdkj&>China General Nuclear Power Group Uranium Resources Co., Ltd., Beijing, 100029, China
关键词：
铀溶液;循环吸附;循环淋洗;循环转型;树脂中毒;动力学模型
摘要：
采用201×7强碱性阴离子树脂,通过固定床动态吸附试验,考察了循环吸附次数、吸附原液浓度、吸附原液流量等因素对树脂吸附铀穿透时间与饱和容量影响;开展树脂对铀的动态循环吸附-淋洗-转型试验,采用电感耦合等离子体质谱仪(ICP-MS)和工艺矿物学参数测试系统(MLA)对吸附前后树脂的表面进行表征和分析,测试饱和树脂与贫树脂杂质元素含量,探讨树脂"中毒"的物理化学机理以及有效的解毒方式;理论推导出树脂吸附铀动力学模型,并对试验数据进行拟合,验证模型的精确度.结果表明:循环吸附次数、吸附原液浓度、吸附原液流量等因素对树脂吸附穿透时间与饱和容量有较大影响.当动态循环吸附-淋洗-转型次数达到10次时,树脂表面和孔隙积累了沉淀物,功能基团上积累PO43-、Mo、SiO2等杂质元素,造成树脂"中毒",树脂吸附饱和容量降低了13.7%,淋洗峰值降低了28.9%;树脂"中毒"主要是沉淀物堵塞树脂通道造成功能基团物理失效,以及亲基性杂质元素占据功能基团造成功能基团化学失效.NaOH"解毒"树脂后,树脂饱和容量较解毒前提高了9.9%,树脂的淋洗率达到99.8%,树脂具有较强的稳定性.理论推导出的固定床吸附动力学模型能很好地描述树脂吸附铀的动力学过程,拟合精度高.
语种：
中文
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地浸铀矿山退役采区地下水中铀种态的PHREEQC模拟研究
作者：
阮家剑;丁德馨;张辉;李梦婷;满嘉乐
期刊：
矿业研究与开发 ,2023年43(01):154-157 ISSN：1005-2763
作者机构：
南华大学资源环境与安全工程学院;南华大学铀矿冶生物技术国防重点学科实验室;南华大学极贫铀资源绿色开发技术湖南省重点实验室
关键词：
地浸采铀矿山;地下水;铀种态
摘要：
以我国西北某地浸铀矿退役采区地下水作为研究对象，通过实地调查和取样分析，研究了该区域地下水的铀含量和其他理化性质。采用PHREEQC软件计算该区域地下水中铀的赋予形态，并模拟pH、温度、SO42-浓度和NO-3浓度对地下水中铀形态的影响。结果表明，该区域地下水铀的价态为U（Ⅵ）,主要以UO2SO4、UO22+、UO2（SO4）22-和UO2NO+3的形式存在，占比分别为72.0%、20.7%、7.2%、0.1%。通过模拟得出：当pH=2～5时，UO2SO4是该水环境中铀的优势种态，随着pH值的持续增高，UO2（OH）2显著增加，在pH大于5的条件下，UO2（OH）2成为优势种态；当温度在10℃至40℃的范围内时，UO2SO4始终是该水环境中铀的优势种态，随着温度升高，UO2SO4含量也缓慢升高；随着SO42-浓度的降低，UO2SO4也会减少，当SO42-浓度低至0.005 mol/L后，UO22+成为优势铀种态；随着NO3-浓度的降低，UO2NO+3会缓慢减少，但铀的优势种态依然为UO2SO4。
语种：
中文
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Preparation of carboxy methyl cellulose stabilized nano-sized zero-valent iron and its properties for in situ remediation of groundwater in areas after acid in situ leach uranium mining
作者：
Liu, Yalan;Zhang, Hui;Ding, Yang;Hu, Nan;Ding, Dexin
期刊：
Environmental Science: Water Research & Technology ,2023年9(5):1480-1490 ISSN：2053-1400
通讯作者：
Ding, Dexin(dingdxzzz@163.com)
作者机构：
[Ding, Dexin; Zhang, Hui; Hu, Nan; Ding, Yang; Liu, Yalan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; Hu, Nan; Ding, Yang; Liu, Yalan] Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Peoples R China.
通讯机构：
[Dexin Ding] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China<&wdkj&>Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang 421001, China
摘要：
Dissolved uranium in groundwater contaminated by acid in situ leaching poses a serious threat to human health and the ecosystem due to its toxicological properties. In this article, carboxy methyl cellulose (CMC) with high dispersity was used to stabilize nano zero-valent iron (nZVI), and highly dispersed CMC-stabilized nZVI (CMC-nZVI) was synthesized by a liquid-phase reduction method, characterized by multiple analysis techniques, and tested for its dispersal and antioxidizing properties. Compared with nZVI, CMC-nZVI showed great dispersal and resistance to oxidation. The effects of oxygen, pH, dosage, initial U(vi) concentration and HA concentration on U(vi) elimination by CMC-nZVI, and the U(vi) removal kinetics and mechanism were investigated. The removal capacity of U(vi) by CMC-nZVI was 400 mg g−1 at pH 3.0, and the dose of 0.1 g L−1 showed excellent uranium removal efficiency under acid conditions. Moreover, CMC-nZVI was used to treat groundwater from an area after acid in situ leach uranium mining, and CMC-nZVI was found to be capable of decreasing the concentration of uranium in the acidic groundwater (pH < 3) from 0.321 to 0.001 mg L−1. The results indicate that CMC-nZVI has potential application prospects in the in situ remediation of groundwater in areas after acid in situ leach uranium mining. © 2023 The Royal Society of Chemistry.
语种：
英文
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Remediation of percolate water from uranium tailings reservoir by coupling iron-carbon micro-electrolysis and sulfate reducing bacteria [铁炭微电解与硫酸盐还原菌耦合修复铀尾矿库渗滤水的研究]
作者：
胡南;陶德敏;杨照岚;王学兵;张向旭;...
期刊：
化工学报 ,2023年74(6):2655-2667 ISSN：0438-1157
作者机构：
[胡南; 陶德敏; 丁德馨] 南华大学铀矿冶生物技术国防重点实验室,湖南 衡阳 421001;[胡南; 陶德敏; 丁德馨] 南华大学极贫铀资源绿色开发技术湖南省重点实验室,湖南 衡阳 421001;中广核铀业发展有限公司,北京 100029;[刘玉龙] 中广核铀业发展有限公司;[杨照岚; 王学兵; 张向旭] 南华大学
关键词：
铀;硫酸盐还原菌;微电解;还原;厌氧;修复
摘要：
设计了铁炭微电解-硫酸盐还原菌(Fe/C-SRB)、铝炭微电解-硫酸盐还原菌(Al/C-SRB)、炭-硫酸盐还原菌(C-SRB)、铁炭微电解(Fe/C)、铝炭微电解(Al/C)和炭(C)6个反应器,并研究了它们修复铀尾矿...展开更多 设计了铁炭微电解-硫酸盐还原菌(Fe/C-SRB)、铝炭微电解-硫酸盐还原菌(Al/C-SRB)、炭-硫酸盐还原菌(C-SRB)、铁炭微电解(Fe/C)、铝炭微电解(Al/C)和炭(C)6个反应器,并研究了它们修复铀尾矿库渗滤水中U、Mn、Zn、SO42-以及NO3+的效果。结果显示:经过2.5 h,Fe/C-SRB系统出水U浓度降至0.05 mg/L以下;1 d后,Mn浓度降至10 mg/L以下;1 d后,Zn浓度降至0.05 mg/L以下;10 d后,SO42-浓度降至50 mg/L以下;18 d后,NO3+浓度降至10 mg/L以下,均达到了相关国家排放标准,并运行稳定,处理效率显著高于其他反应器。60 d时,Fe/C-SRB系统填料中具有还原U(Ⅵ)功能的微生物Desulfotomaculum、Desulfovibrio和Desulfosporosinus群落丰度总和达到61.45%,与Al/C-SRB、C-SRB、Al/C、Fe/C和C系统相比,分别高了40.35%、60.06%、57.22%、59.73%和52.46%;渗滤水中33.20%的U(Ⅵ)被微生物和铁还原成U(Ⅳ)。本研究表明Fe/C-SRB是一种具有应用前景的修复铀尾矿库渗滤水的方法。收起
语种：
中文
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基于非支配多目标优化方法的铀尾矿砂覆盖材料优选
作者：
邓年彪;丁德馨
期刊：
铀矿冶 ,2023年42(04):47-52 ISSN：1000-8063
作者机构：
[邓年彪; 丁德馨] 南华大学资源环境与安全工程学院
关键词：
铀尾矿砂;覆盖材料;非支配多目标优化方法;氡析出率
摘要：
铀尾矿砂覆盖材料优化选择对铀矿山尾矿砂治理有着重要意义。通过构建铀尾矿砂覆盖层氡浓度分布模型，采用单层和三层覆盖层材料，以氡析出率和综合成本为决策目标构建了多目标决策模型，基于多目标非支配排序方法，寻找可行方案的最优解。对于铀尾矿砂，若采用单层覆盖材料，只有黏土、水泥砂浆和沥青3种材料能够在合理厚度范围内满足氡析出率国标限值要求；与单层覆盖材料相比，三层覆盖层材料外的氡析出率满足国标限值要求，且综合成本降低了75.9%。
语种：
中文
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An Integrated Process Including Rb Leaching from Rubidium-Bearing Polymetallic Ore and Calcium Removing from Leachate
作者：
Zhou, Han;Li, Feng;Zhang, Hui;Yang, Yingchun;Qiu, Yonggen;...
期刊：
MINING METALLURGY & EXPLORATION ,2023年40(5):1729-1736 ISSN：2524-3462
通讯作者：
Ding, DX
作者机构：
[Yang, Yingchun; Ding, Dexin; Zhang, Hui; Zhou, Han; Dai, Zhongran; Li, Feng; Hu, Nan; Ma, Jianhong; Ding, Yang; Ding, DX] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Yang, Yingchun; Ding, Dexin; Zhang, Hui; Zhou, Han; Dai, Zhongran; Li, Feng; Hu, Nan; Ma, Jianhong; Ding, Yang; Ding, DX] Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Peoples R China.;[Zhong, Zhihua; Qiu, Yonggen] Hunan Rubidium Technol Co Ltd, Chenzhou 423099, Peoples R China.
通讯机构：
[Ding, DX ] U;Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Peoples R China.
关键词：
Calcination;Carbon dioxide;Energy utilization;Ore roasting;Ores;pH;Rubidium;Solvent extraction;Bearing ores;Calcium removing;Chlorination roasting;Leachates;Leaching rates;Polymetallic ores;Raffinates;Rb leaching;Rb-bearing polymetallic ore;Removing rates;Leaching
摘要：
In the traditional chlorination roasting-water leaching-solvent extraction process for the extraction of rubidium-bearing ore, Rb leaching from the ore and calcium removing from the leachate are conducted separately, and this results in the complicated process and high energy consumption. In order to integrate the Rb leaching and calcium removing processes, Rb-bearing polymetallic ore was firstly treated by chlorination roasting, it was then leached in a micro-reactor with raffinate, and the calcium ions in the leachate were removed in the reactor as carbonate precipitates by passing CO2 at certain pressure into the reactor. The effects of raffinate alkalinity, CO2 pressure, and CO2 reaction time on Rb leaching rate and calcium removing rate were investigated. The experimental results show that when Rb-bearing polymetallic ore was leached for 90 min by stirring with raffinate with 1.125-mol/L alkalinity, and the pulp was made to react with CO2 at 0.8 MPa for 15 min, the Rb leaching rate and calcium removing rate amounted to 92% and 98.2%, respectively. This integrated process including Rb leaching from Rb-bearing polymetallic ore and calcium removing from leachate could simplify the process for the extraction of Rb-bearing ore and increase its economic benefits. © 2023, Society for Mining, Metallurgy & Exploration Inc.
语种：
英文
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Enhancement effects of weak electric field on uranium and manganese removal from leachate of uranium tailings impoundment by artificial wetland
作者：
Ding, Dexin;Zhang, Qi;Zhang, Hui;Li, Guangyue;Hu, Nan
期刊：
Journal of Cleaner Production ,2022年363:132601 ISSN：0959-6526
通讯作者：
Nan Hu
作者机构：
[Ding, Dexin; Zhang, Hui; Zhang, Qi; Li, Guangyue; Hu, Nan] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Min, Hengyang 421001, Peoples R China.;[Ding, Dexin; Hu, Nan] Hunan Prov Key Lab Green Dev Technol Extremely Low, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Nan Hu] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China<&wdkj&>Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang, Hunan, 421001, China
关键词：
Bioaccumulation;Biochemistry;Bioremediation;Physiological models;Plants (botany);Sodium chloride;Superoxide dismutase;Uranium;Wetlands;Artificial wetland;Electric field intensities;Enhancement effects;Hydraulic retention;Leachate of urania tailing impoundment;Leachates;Phytoremediation;Retention time;Uranium tailings impoundments;Weak electric field;Electric fields
摘要：
Artificial wetlands (AWs) planted with Acorus Calamus L. and coupled with weak electric field (WEF) were constructed to investigate the effects of flow direction, hydraulic retention time (HRT), and WEF intensities on the removal of uranium and manganese from leachate of uranium tailings impoundment (LUTI), the distribution characteristics of the uranium and manganese in the AWs, and the growth and physiological responses of the plants in them. The results showed that the optimized removal rates of uranium and manganese from LUTI were observed to be 97.03% and 99.72%, respectively, in the upwelling AW planted with Acorus Calamus L. and coupled with WEF intensity of 0.3 V/cm when the HRT was 72 h. Compared with the group without WEF, the bioaccumulations of uranium and manganese by Acorus Calamus L were increased by 169.23% and 522.91%, respectively, the adsorption capacities of biofilms toward uranium and manganese were increased by 7.38% and 48.90%, respectively, the content of uranium in the substrates was decreased by 10.76%, while the manganese concentration had no significant difference, and the contents of uranium and manganese in the salt scale deposited on the cathode surface reached 51.20 and 653.11 mg/kg, respectively, when the WEF intensity was 0.3 V/cm in the AW. The applied WEF increased the activity of superoxide dismutase (SOD) and the content of glutathione (GSH), and reduced the content of malondialdehyde (MDA) in the leaves of Acorus Calamus L, so as to alleviate the stress of uranium and manganese on wetland plants in the AW. Therefore, the AW has potential application in the removal of uranium and manganese from LUTI. © 2022 Elsevier Ltd
语种：
英文
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基于植酸水解液的酸法地浸铀矿污染地下水修复试验
作者：
仇晓钰;张辉;李艾书;胡南;马建洪;...
期刊：
有色金属(矿山部分) ,2022年74(06):19-27 ISSN：1671-4172
作者机构：
南华大学 资源环境与安全工程学院,湖南 衡阳 421001;南华大学 铀矿冶生物技术国防重点学科实验室,湖南 衡阳 421001;[仇晓钰; 王永东; 戴仲然; 马建洪; 丁德馨; 张辉; 李艾书; 胡南] 南华大学资源环境与安全工程学院<&wdkj&>南华大学铀矿冶生物技术国防重点学科实验室
关键词：
酸法地浸采铀;铀污染地下水;植酸;水热反应;植酸水解液;磷酸盐;共沉淀
摘要：
酸法地浸铀矿山铀污染地下水的修复是亟待研究解决的重大问题.采用水热反应法水解植酸制备了植酸水解液,根据酸法地浸铀矿山铀污染地下水的理化特性制备了模拟铀污染地下水,试验研究了植酸水解液添加量及其pH值对模拟铀污染地下水修复效果的影响,同时对修复过程中模拟铀污染地下水的pH值、铀浓度以及磷酸根离子、钙离子、总铁离子、锰离子、锌离子和镁离子的浓度进行了监测,并结合XRD、SEM、TEM和XPS表征分析,探讨了其修复模拟铀污染地下水的机理.试验结果表明,当植酸水解液的添加量为2 mL,磷酸根浓度为24.562 g/L,初始pH值为6,模拟铀污染地下水的水量为100 mL,初始铀浓度为5 mg/L,初始pH值为3,反应12 h后,铀的去除率达到了99％以上,pH值升高到5.9.本项研究验证了采用植酸水解液修复酸法地浸铀矿山铀污染地下水的可行性.植酸价廉易得,可作为一种经济的磷源代替价格昂贵的磷酸盐化合物,在铀污染地下水修复领域展现其潜在的创新应用价值.
语种：
中文
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Remediation of uranium-contaminated acidic red soil by rice husk biochar
作者：
Fu, Haiying;Wang, Shuai;Zhang, Hui;Dai, Zhongran;He, Guicheng;...
期刊：
Environmental Science and Pollution Research ,2022年29(51):77839-77850 ISSN：0944-1344
通讯作者：
Dexin Ding
作者机构：
[Ding, Dexin; Zhang, Hui; He, Guicheng; Dai, Zhongran; Li, Guangyue; Wang, Shuai; Fu, Haiying] Univ South China, Key Discipline Lab Natl Def Biotechnol Uranium Mi, Hengyang 421001, Peoples R China.;[Ding, Dexin; Zhang, Hui; He, Guicheng; Dai, Zhongran; Li, Guangyue; Wang, Shuai; Fu, Haiying] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Peoples R China.
通讯机构：
[Dexin Ding] K;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, People’s Republic of China<&wdkj&>School of Resource Environment and Safety Engineering, University of South China, Hengyang, People’s Republic of China
关键词：
Uranium;Rice husk biochar;Acid rain leaching;Immobilization;Red soil;Uranium-contaminated soil
摘要：
Uranium (U) in the U-contaminated acidic red soil exhibits high mobility. In the present study, rice husk was used to produce biochar to remediate U-contaminated red soil under acid precipitation. Firstly, batch adsorption experiments showed that the dissolution of alkaline substance in biochar could buffer the pH value of acidic solution. The equilibrium pH value had a crucial influence on biochar adsorption capacity of U, and the neutral equilibrium pH value was favorable for adsorption. Then, the incubation experiments of red soil with biochar were performed, and the Synthetic Precipitation Leaching Procedure (SPLP) extraction of amended red soil showed that the short-term leachability of U was decreased from 26.53% in control group (without biochar) to 1.40% in 10% biochar-amended red soil. Subsequently, the sequential extraction showed that the fraction of U was mainly transformed from exchangeable and Fe/Mn oxide fraction to carbonate fraction after biochar amendment, and the total amount of exchangeable U and carbonate fraction U in soil was increased slightly. Finally, simulated acid rain leaching experiments showed that the capability of amended red soil to resist acid rain acidification was enhanced. And the long-term leachability of U in amended red soil was decreased from 26.37% in control group to 3.18% in the 10% biochar-amended red soil under the simulated acid rain leaching conditions. In conclusion, biochar has passivation effect on U in U-contaminated red soil, which can reduce the long-term and short-term mobility of U in acidic environments. This study provided an experimental basis for the application of biochar in remediation and improvement of U-contaminated acidic red soil.
语种：
英文
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羧甲基纤维素改性纳米零价铁的制备及性能研究
作者：
刘欣媛;张辉;丁德馨;胡南;戴仲然;...
期刊：
矿业研究与开发 ,2022年42(12):160-165 ISSN：1005-2763
作者机构：
南华大学资源环境与安全工程学院;南华大学铀矿冶生物技术国防重点学科实验室;南华大学极贫铀资源绿色开发技术湖南省重点实验室;[刘欣媛; 戴仲然; 丁德馨; 张辉; 胡南; 李峰] 南华大学资源环境与安全工程学院<&wdkj&>南华大学铀矿冶生物技术国防重点学科实验室<&wdkj&>南华大学极贫铀资源绿色开发技术湖南省重点实验室
关键词：
纳米零价铁;羧甲基纤维素;改性;铀污染;地下水修复
摘要：
针对纳米零价铁（nZVI）在反应过程中易出现团聚、氧化、反应活性降低等问题，利用羧甲基纤维素（CMC）对nZVI进行改性，制备出了含不同比例（0、0.1%、0.5%、1.0%）CMC的CMC-nZVI,研究了其沉降性、抗氧化性、粒径大小以及去除酸性铀废水中U（Ⅵ）的性能。结果表明：随着CMC比例的增加，CMC-nZVI的粒径更小、分散性更好、抗氧化性更强，其中含1.0%CMC的CMC-nZVI的粒径最小，分散性最好，抗氧化性最强，在放置60 d后无明显沉降及氧化现象；当酸性铀废水初始pH为3,铀的初始质量浓度为5 mg/L时，含1.0%CMC的CMC-nZVI去除U（Ⅵ）的效果最好，去除率达到了97.64%,其pH提高到了5.21。研究成果为CMC-nZVI在酸性铀污染地下水修复中的实际应用提供了理论支持。
语种：
中文
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多级结构Ni-Co-LDH的制备及其吸附U（Ⅵ）的行为与机理
作者：
王云;龙江;胡南;丁德馨;郭灿;...
期刊：
有色金属工程 ,2022年12(03):16-23 ISSN：2095-1744
作者机构：
[胡南; 王云; 丁德馨; 张辉] 南华大学资源环境与安全工程学院,湖南衡阳421001;[胡南; 王云; 丁德馨; 张辉] 南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001;[胡南; 王云; 丁德馨; 张辉] 南华大学极贫铀资源绿色开发技术湖南省重点实验室,湖南衡阳421001;[李四桂; 郭灿; 龙江] 南华大学
关键词：
多级结构Ni-Co-LDH;U(Ⅵ)吸附;吸附动力学;U(Ⅵ)吸附机理
摘要：
以ZIF-67为模板，原位水解制备多级结构Ni-Co-LDH。研究了吸附时间、溶液pH值、温度及U（Ⅵ）初始浓度对吸附U（Ⅵ）性能的影响，并分析了吸附U（Ⅵ）前后Ni-Co-LDH微观结构、表面形貌和含氧基团的变化情况，阐明了Ni-Co-LDH对U（Ⅵ）的吸附机理。结果表明：pH值是影响吸附的主要因素，吸附最佳pH值为5.0,在该条件下，饱和容量最大的吸附剂为Ni-Co-LDH-180,其吸附容量达到1 135.30 mg/g。Ni-Co-LDH-180吸附U（Ⅵ）过程与假二级动力学模型及Langmuir吸附等温线模型吻合，且该吸附过程是一个自发吸热过程。Ni-Co-LDH-180在含Ca2+、Mg2+、Ni2+、Cu2+、Zn2+、Pb2+、CO■等杂质离子的混合溶液中对U（Ⅵ）具有较好的选择性。Ni-Co-LDH-180高效吸附U（Ⅵ）主要归功于其表面的Ni—OH、Co—OH和Ni—O—Co基团。
语种：
中文
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硝酸盐还原菌群的富集及其去除酸法地浸矿山地下水中硝酸盐的研究
作者：
王永东;易海涛;丁德馨;翟开革;李梦婷;...
期刊：
矿业研究与开发 ,2022年42(12):166-171 ISSN：1005-2763
作者机构：
南华大学资源环境与安全工程学院;南华大学铀矿冶生物技术国防重点学科实验室;[王永东; 丁德馨; 翟开革; 易海涛; 袁野; 李梦婷] 南华大学资源环境与安全工程学院<&wdkj&>南华大学铀矿冶生物技术国防重点学科实验室
关键词：
铀污染地下水;硝酸盐;还原;菌群
摘要：
为去除酸法地浸矿山地下水中的硝酸盐，采用富集反应体系从不同地区岩石样品中富集得到了硝酸盐还原菌群，研究了其对酸法地浸矿山地下水中硝酸盐的还原作用。结果表明，共富集得到了3组有硝酸盐还原能力的菌群，但只有从西北某退役铀矿山岩心样中富集的菌群能适应酸性铀污染地下水环境，并表现出较好的硝酸盐还原能力，该菌群能在10 d内将酸法地浸矿山地下水中的硝酸盐浓度从100 mg/L降至1 mg/L,地下水的pH由3.0提高至5.0左右，其优势菌为Tumebacillus,占比达到31.62%。
语种：
中文
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强风化强氧化砂岩铀矿工艺矿物学与浸出性能
作者：
刘玉龙;扶海鹰;胡南;李广悦;喻清;...
期刊：
稀有金属 ,2022年46(5):665-672 ISSN：0258-7076
通讯作者：
Ding, D.
作者机构：
[扶海鹰; 喻清; 丁德馨; 胡南; 李广悦] 南华大学铀矿冶生物技术国防重点学科实验室;中广核铀业发展有限公司;[刘玉龙] 南华大学铀矿冶生物技术国防重点学科实验室<&wdkj&>中广核铀业发展有限公司
通讯机构：
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, China
关键词：
强风化强氧化砂岩铀矿石;铀矿物赋存状态;工艺矿物学;组合浸出工艺
摘要：
以采自某急倾斜疏干型砂岩铀矿床的强风化强氧化砂岩铀矿石为研究对象,先将其破碎至-10mm,分成5~10,3~5,1~3,0.5~1和0~0.5mm这5个粒级;然后分析各粒级铀矿石的质量和品位;再分析其铀矿物的赋存形态,观测铀矿石和铀矿物的微观形貌和结构;最后开展这类铀矿石的搅拌浸出-堆浸组合试验。结果表明:该铀矿石由砂岩、砾岩和泥岩组成,其结构松散,裂隙发育,破碎至-10 mm后,-0.5 mm粒级的铀矿石占比较高,导致破碎矿石渗透性差,不适合直接堆浸;铀矿物赋存状态较简单,以独立矿物和二连体赋存为主,易解离,占铀矿物总量的80%~85%;铀矿石破碎至-10 mm后,-0.5 mm粒级的铀矿石搅拌浸出3 h,+0.5 mm粒级的铀矿石柱浸4 d后,即可浸出85%左右的铀,余下15%左右的铀浸出相对较慢,搅拌浸出-堆浸组合工艺可高效浸出矿石中的铀;柱浸浸出率(R)随时间的变化可采用经验公式R = k_1(1 -e~(-k_2t))×100%进行拟合,其中参数k_1为矿石中可回收铀的质量分数,参数k_2为与浸出速率有关的常数,t为浸出时间。
语种：
中文
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硅酸盐-磷酸盐对酸法地浸采铀退役采区模拟地下水的修复
作者：
张琪;马建洪;张丹;张悦;谭国炽;...
期刊：
环境工程学报 ,2022年16(5):1506-1515 ISSN：1673-9108
通讯作者：
Ding, D.
作者机构：
南华大学铀矿冶生物技术国防重点学科实验室,衡阳421001;南华大学极贫铀资源绿色开发技术湖南省重点实验室,衡阳421001;[丁德馨; 张丹; 张悦; 马建洪; 谭国炽; 胡南; 张辉; 张琪] Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China, Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium Resources, Hengyang, 421001, China
通讯机构：
[Ding, D.] K;[Ding, D.] H;Hunan Province Key Laboratory of Green Development Technology for Extremely Low Grade Uranium ResourcesChina;Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, China
关键词：
酸法地浸采铀;地下水;原位修复;硅酸盐;磷酸盐
摘要：
为探索酸法地浸采铀退役采区地下水的原位修复技术，本研究先从西北某酸法地浸采铀退役采区采取地下岩心样，同时制备了酸法地浸采铀退役采区地下水模拟水样，构建模拟修复反应的微模型；再向微模型中分别加入硅酸钠溶液、磷酸二氢钾溶液、硅酸钠-磷酸二氢钾混合溶液以考察其对地下水的修复效果。结果表明 ： 加 入 的 硅 酸 钠 -磷 酸 二 氢 钾 与 铀 反 应 形 成 了 胶 磷 钙 铁 矿 （Ca6Fe9（PO4）9O6（H2O）6.3H2O）、 偏 钠 铀 矿 物（Na（UO2）（PO4）.3H2O） 和 （NaPUO6.3H2O） 三种矿物；沉淀物中铁锰氧化物交换态铀的含量增加到了 41%；铀的去除率达到了 99.72%。
语种：
中文
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酸法地浸采铀退役采区地下水二步修复法
作者：
王贤磊;李峰;张辉;马建洪;胡南;...
期刊：
有色金属工程 ,2021年11(10):136-142 ISSN：2095-1744
作者机构：
南华大学资源环境与安全工程学院,湖南衡阳421001;南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001;南华大学极贫铀资源绿色开发技术湖南省重点实验室,湖南衡阳421001;[王贤磊; 戴仲然; 马建洪; 丁德馨; 张辉; 胡南; 姜瑭; 王新廷; 李峰] 南华大学资源环境与安全工程学院<&wdkj&>南华大学铀矿冶生物技术国防重点学科实验室<&wdkj&>南华大学极贫铀资源绿色开发技术湖南省重点实验室
关键词：
地浸采铀;地下水;CaO中和;微生物膜反应器
摘要：
酸法地浸采铀退役采区地下水具有酸性强、铀及SO24-浓度超标的特性,其修复是亟待研究解决的问题。以西北某地浸采铀退役采区地下水为研究对象,先采用CaO中和法去除其中的铀;再采用厌氧脱硫脱硫弧菌微生物膜反应器去除SO24-,并探究碳源与进水流速对去除中和处理后的地下水中的SO24-的影响。结果表明:每升地下水经0.167g CaO中和处理后,pH值由3.0升至7.0左右,铀浓度从最初的0.4mg/L降至0.04mg/L,达到了排放标准,SO24-浓度从1 349.2mg/L降至840.3mg/L;中和处理后的地下水经脱硫脱硫弧菌微生物膜反应器处理,当进水流速为1.0mL/min、碳源为葡萄糖时,SO24-浓度从840.3mg/L降至256mg/L,也达到了排放标准。研究表明,先采用CaO中和法去除铀、再采用厌氧脱硫脱硫弧菌微生物膜反应器去除SO24-的二步修复法在酸法地浸采铀退役采区地下水处理中具有潜在应用前景。
语种：
中文
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