铀矿石化学浸出与细菌浸出沉淀产物的比较
作者:
刘玉龙;丁德馨;李广悦;胡南;王永东;...
期刊:
过程工程学报 ,2010年10(4):679-684 ISSN:1009-606X
通讯作者:
Ding, D.-X.
作者机构:
[刘玉龙; 胡南; 王有团; 王清良; 李广悦; 丁德馨; 王永东] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, Hunan 421001, China
通讯机构:
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词:
铀矿石;化学浸出;细菌浸出;沉淀物
摘要:
为了研究细菌在铀矿石细菌浸出中的作用及产物, 设计了Fe~(2+)浓度分别为2.01和4.63 g/L的化学浸出和细菌浸出4种矿粉实验与Fe~(2+)浓度为4.63 g/L的化学浸出和细菌浸出2种矿块实验.监测了矿粉浸出体系中pH值、Eh值及铀浓度随时间的变化, 并对铀矿石化学浸出和细菌浸出的矿块表面形貌、元素及矿物组成进行了分析.结果表明, 在4种矿粉浸出体系中, Fe~(2+)浓度分别为2.01和4.63 g/L的化学浸出铀矿石浸出率分别为64.86%和69.13%, 细菌浸出浸出率分别为94.35%和92.80%.试块化学浸出后表面主要为硅酸盐类矿物, 细菌浸出后表面主要是黄钾铁矾类矿物.细菌浸出体系中含适量铁可有效降低沉淀量, 提高浸出率
语种:
中文
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铀矿堆浸酸性尾渣中和的动力学特征及模型
作者:
丁德馨;刘玉龙;李广悦;王有团
期刊:
原子能科学技术 ,2010年44(5):538-542 ISSN:1000-6931
通讯作者:
Ding, D.-X.
作者机构:
[刘玉龙; 丁德馨; 李广悦; 王有团] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构:
Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词:
铀矿堆浸酸性尾渣;中和;扩散-反应;动力学模型
摘要:
采用氧化钙、氢氧化钠和氨水作为中和剂,对铀矿堆浸酸性尾渣进行中和试验,试验过程中检测了中和体系的pH随时间的变化,并根据检测结果建立了尾渣中和的动力学模型. 结果表明,铀矿堆浸酸性尾渣的中和过程,包括尾渣颗粒表面余酸与中和剂的快速反应,及尾渣颗粒内部余酸与中和剂的缓慢扩散-反应两个阶段;中和过程中,中和剂扩散-反应的非线性耦合和反馈作用模型,可很好地反映尾渣中和反应的过程和方式,中和体系的pH呈现出明显的非线性振荡现象;尾渣中和的动力学模型,能很好地拟和中和体系的pH随时间的变化
语种:
中文
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松散破碎介质中气体渗流规律试验研究
作者:
李广悦;丁德馨;张志军;饶龙;徐文平;...
期刊:
岩石力学与工程学报 ,2009年28(4):791-798 ISSN:1000-6915
通讯作者:
Li, G.(LGY673@163.com)
作者机构:
[李广悦; 饶龙] School of Resources and Safety Engineering, Central South University, Changsha 410083, China;[张志军; 丁德馨; 陈翔; 李广悦; 饶龙; 徐文平] School of Nuclear Resources and Safety Engineering, University of South China, Hengyang 421001, China
通讯机构:
School of Resources and Safety Engineering, Central South University, China
关键词:
岩石力学;松散破碎介质;气体渗流;自适应神经模糊推理系统;渗透率;惯性系数
摘要:
原地爆破浸出采场的铀矿堆,是一种松散破碎介质,其颗粒级配服从Rosin-Rammler分布.这种介质中的气体渗流同时受到介质的特征粒径、粒径分布指数和孔隙率的影响.为了研究这种影响,根据Rosin-Rammler分布,选配具有不同颗粒级配的7组试样,采用自制的松散破碎介质气体渗流试验装置,对其中气体渗流的规律进行试验研究,并利用试验结果,采用自适应神经模糊推理系统,建立根据特征粒径、粒径分布指数和孔隙率预测渗透率和惯性系数的自适应神经模糊推理系统(ANFIS)模型.结果表明:松散破碎介质中的气体渗流不满足Darcy定律,而满足Darcy-Forchheimer定律;所建立的预测渗透率和惯性系数的ANFIS模型,能够给出具有足够精度的预测结果,这为渗透率和惯性系数的预测开辟新的途径.
语种:
中文
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Metal pollution in Huayuan river in Hunan province in China by manganese sulphate waste residue
作者:
Hu, Nan;Zheng, Ji-Fang* ;Ding, De-Xin;Liu, Jun;Yang, Lu-Qing;...
期刊:
Bulletin of Environmental Contamination and Toxicology ,2009年83(4):583-590 ISSN:0007-4861
通讯作者:
Zheng, Ji-Fang
作者机构:
[Li, Guang-Yue; Liu, Yu-Long; Yin, Jie; Zheng, Ji-Fang; Yang, Lu-Qing; Hu, Nan; Ding, De-Xin; Liu, Jun; Wang, Yong-Dong] Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Zheng, Ji-Fang] U;Univ S China, Key Discipline Lab Natl Def Biol Technol Uranium, Hengyang 421001, Hunan, Peoples R China.
关键词:
Huayuan River;Manganese sulphate waste residue;Sediment;Speciation;Water pollution
摘要:
The Huayuan River in Hunan Province in China is subject to ongoing mining activity with Mn extraction. In this study, the level and environmental significance of metals (including Mn, Cd, Pb, Cu, Zn, Ni and Fe) concentrations in the surface water and river sediments have been investigated along a 187 km reach of the Huayuan River. Using the X-ray fluorescence (XRF) analysis, we analyzed the characterization of metals in manganese sulphate waste residue (MSWR) deposited along the bank of Huayuan River. The speciation of metals in both sediment and MSWR was established using the BCR-three step sequential extraction procedure. In the water samples, the average concentrations of Mn, Cd and Pb exceeded the acceptable concentrations for drinking water in the WHO Guidelines for drinking water quality, Vol. 1, Recommendations, Geneva (2004) and Chinese (GB 5749-2006) guidelines, respectively. The average concentrations of Mn, Cd, Pb and Zn in the river sediments were found to be considerably higher than the corresponding world average shale values. The percentages of Cd (31.4%), Mn (31.1%), Zn (12.8%) and Pb (8.1%) associated with exchangeable and weak acid fraction in the sediments were higher than other metals. Mn (5.81%), Zn (0.208%), Pb (0.0292%) and Cd (0.0113%) were identified in MSWR by XRF analysis. The percentages of Mn, Cd, Zn and Pb associated with the exchangeable and weak acid soluble fraction in MSWR were 41.9%, 31.1%, 23.8% and 9.8%, respectively. The peak solute and sediment-bound metal concentrations were found at the sites of MSWR deposited along the bank of Huayuan River. The results suggested that MSWR deposited along the bank may have a closely relation with the metal pollution of Huayuan River. The results obtained may be useful to assess both short and long-term environmental impact of the MSWR deposited activities and support decisions for a future remediation of this river. © 2009 Springer Science+Business Media, LLC.
语种:
英文
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嗜酸氧化亚铁硫杆菌在沥青铀矿石浸出中的作用
作者:
丁德馨;刘玉龙;李广悦;胡南;王永东;...
期刊:
化工学报 ,2009年60(11):2903-2910 ISSN:0438-1157
通讯作者:
Ding, D.(dingdx@nhu.edu.cn)
作者机构:
[丁德馨; 刘玉龙; 李广悦; 胡南; 王永东; 王有团] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, Hunan, China
通讯机构:
Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词:
沥青铀矿石;嗜酸氧化亚铁硫杆菌;细菌浸出;能谱分析
摘要:
为了研究沥青铀矿石的细菌浸出机理,设计了有菌有铁、有菌无铁及无菌无铁3种矿粉浸出试验及有菌无铁、无菌无铁两种试块浸出试验,检测了矿粉浸出体系中细菌的浓度、pH值、Eh、亚铁离子浓度、总铁离子浓度及铀浓度的变化,分析了浸出尾渣中O、Mg、K、P、S、Fe、U等元素的含量,观测了浸出前后试块表面形貌的变化.结果表明,在沥青铀矿石浸出过程中,嗜酸氧化亚铁硫杆菌可以高效氧化浸出体系中的亚铁、还原态硫及元素硫,使得浸出体系中的Eh升高和pH值降低;有菌有铁浸出体系中,高浓度的细菌、高浓度的铁、低pH值和高Eh可加速铀矿石的浸出和提高铀矿石的浸出率;有菌无铁浸出体系中,即使总铁离子浓度很低,但由于有细菌的存在,同样可以加速铀矿石的浸出和提高铀矿石的浸出率.有菌无铁的试块浸出中,试块表面出现了许多溶蚀坑,这表明细菌对铀矿石具有直接氧化作用.
语种:
中文
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沥青铀矿石细菌浸出机理的实验研究
作者:
丁德馨;李广悦;刘玉龙;王永东;王有团
期刊:
过程工程学报 ,2008年8(5):859-865 ISSN:1009-606X
通讯作者:
Ding, D.-X.(dingdx@nhu.edu.cn)
作者机构:
[丁德馨; 王有团; 李广悦; 王永东; 刘玉龙] Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
通讯机构:
[Ding, D.-X.] K;Key Discipline Lab. for National Defence for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, China
关键词:
氧化亚铁硫杆菌;沥青铀矿石;浸铀机理;浸出率;间接作用
摘要:
采用氧化亚铁硫杆菌作为实验菌,针对有菌有Fe~(2+)、有菌无铁、无菌有Fe~(3+)、无菌有Fe~(2+)、不控制pH值的无菌无铁和pH值控制在2.0的无菌无铁6种沥青铀矿石浸出体系,考察了浸出过程中细菌的浓度、溶液pH值、电位、亚铁离子浓度、全铁离子、铀浓度等参数的变化,得到铀矿石的浸出率分别为98.00%,80.33%,97.66%,93.00%,20.33%,72.00%。结果表明,在沥青铀矿石的细菌浸出中,细菌的作用以间接作用为主,即细菌把还原态的硫或单质硫及Fe~(2+)氧化成Fe_2(SO_4)_3。由于Fe_2(SO_4)_3是一种强氧化剂,将不溶的U(Ⅳ)氧化为可溶解的U(Ⅵ),从而使沥青铀矿石中的铀得以浸出。
语种:
中文
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