嗜酸兼性异养菌Acidiphilium sp.DX1-1的分离、特征及其浸矿行为(英文)

研究了一株源自江西德兴铜矿矿区的中温嗜酸兼性异养菌Acidiphilium sp.DX1-1的分离、鉴定、特征及其浸矿行为。菌株Acidiphilium sp.DX1-1为短杆状革兰氏阴性菌,最适合的生长温度为30℃,最适合的生长pH约为3.5。该菌株具有广泛的底物利用特性,可以利用有机物进行异养生长并在细胞内积累聚羟基丁酸酯,也可以利用单质硫、三价铁等无机物进行自养生长。系统发育分析表明DX1-1属于Acidiphilium属,与Acidiphilium cryptum and Acidiphilium multivorum的同源性大于99%。在铁闪锌矿生物浸出过程中,Acidiphilium sp.DX1-1表现出极强的浸矿能力,其作用不仅仅是之前报道的作为其他自养嗜酸浸矿细菌的辅助者。在初始pH3.5时,DX1-1能够在一个月内单独地浸出铁闪锌矿中40%的锌。该浸出率高于它与A.ferrooxidans混合以及A.ferrooxidans单独浸出铁闪锌矿(初始pH均为2.0)的浸出率。     

酸浸及紫外诱变对氧化亚铁硫杆菌浸矿的影响

利用从湖北省大冶市铜山口矿区的酸性矿坑水中选育的氧化亚铁硫杆菌（Thiobacillus ferrooxidans,以下简称T.f菌）对该矿区的铁矿进行了浸矿研究。结果表明：未经酸浸处理的矿粉,对体系pH值的影响较大,从而影响T.f菌的生长,进而影响浸矿效果;经过酸浸处理的矿粉,在整个浸矿过程中,体系pH值相对恒定,T.f菌生长良好;对混合菌群进行单次紫外诱变,未能明显提高浸矿能力。     

国内外铀矿石生物浸出机理及工艺应用研究现状

微生物对铀矿的浸出主要以间接作用为主,Fe2+是铀矿氧化反应的电子传递者.生物浸出铀可以减少酸用量,提供硫酸高铁代替双氧水或过氧硫酸(盐)等氧化剂,可用于多种不同的浸出方式中,强化浸出过程,改善铀浸出动力学,提高铀浸出率,有利于环境保护.铀的生物浸出工艺主要有:生物堆浸工艺、生物地浸工艺和生物槽浸工艺.     

生物淋滤技术处理城市垃圾堆肥中重金属的研究进展

阐述了生物淋滤技术的研究现状,着重介绍了生物淋滤技术用于堆肥中重金属去除的研究进展,包括微生物种群、环境条件以及堆肥产品营养组成等。优化运行条件、运用分子生物学技术对机理进行深入探讨以及建立完善的数学模型将是生物淋滤技术的发展方向。     

某高氟铀矿石浸矿菌活性匹配试验研究

选择两个不同的菌群(B3mYP1Q和05B)分别对同一高氟铀矿石进行了微生物浸铀试验。通过对各个浸出阶段数据的分析、对比,选出了对高氟铀矿石具有较强适应能力和较好浸出效果的最佳耐氟菌群和最佳工艺参数。结果表明,B3mYP1Q菌群的浸铀效果较好,铀浸出率达到97.99%。     

矿物加工技术

矿物加工技术对工业发展具有极为重大的意义,本文对现今几种重要的矿物加工技术进行介绍和分析,具有一定的参考意义。     

嗜酸氧化亚铁硫杆菌对含磷难选铁矿石的脱磷研究

针对湖南汝城某含磷难选铁矿石, 简要分析了该铁矿石中磷的赋存状态与磷铁嵌布关系, 研究考察了某嗜酸氧化亚铁硫杆菌(At f菌)的生长特性、不同磷源对该At f菌代谢的影响以及不同浸矿浓度和At f菌接种量条件下的浸矿过程。试验表明: 微生物通过耗磷生长的代谢过程, 对含磷难选铁矿石进行脱磷是可行的。当前At f菌对该含磷铁矿脱磷率最高可达到61.47%。     

EPS-contact-leaching mechanism of chalcopyrite concentrates by A. ferrooxidans

The effect of extracelluar polymeric substances（EPS） on the bioleaching chalcopyrite concentrates in the presence of ironand sulphur-oxidizing bacteria （A. ferrooxidans） was studied. The bacterial number, pH, redox potential, and the concentrations of Fe^2＋ and Cu^2＋ ions were investigated. The leached residues were analyzed by the X-ray diffraction and FT-IR. The results indicate that the EPS makes the bacteria adhere to the chalcopyrite surface easily and it is helpful for bacteria in disadvantageous environment At the same time, EPS film layer with Fe^3＋ deposits on the surface of chalcopyrite and becomes a barrier of oxygen transfer to chalcopyrite to passivate chalcopyrite, and creates the high redox potential space through concentrating Fe^3＋ ions to accelerate bioleaching pyrite in chalcopyrite concentrates. The results suggest that EPS formation promotes bioleaching pyrite and inhibits bioleaching chalcopyrite, especially under high potential condition.     

Growth and surface properties of new thermoacidophilic Archaea strain Acidianus manzaensis YN-25 grown on different substrates

The growth and surface properties of new thermoacidophilic Archaea strain Acidianus manzaensis YN-25 isolated from an acid hot spring in Tengchong,Yunnan Province,China were investigated cultured on different substrates including soluble substrate ferrous sulfate and nonsoluble solid substrates S~0,pyrite and chalcopyrite.The growth characteristics of the cells in each substrate were characterized with the changes in cell number,pH,E_h,and concentrations of Fe~(2+)or SO_4~(2-),or ratios of[Fe~(2+)]to[Fe~...     

Effect of Cu~(2+)ions on bioleaching of marmatite

The effect of Cu~(2+)ions on bioleaching of marmatite was investigated through shake leaching experiments.The bacteria inoculated are a mixed culture ofAcidithiobacillus ferrooxidans,Acidithiobacillus thiooxidans and Lepthospirillum ferrooxidans.The results show that zinc is selectively leached,and the addition of appropriate content of Cu~(2+)ions has positive effect on the bioleaching of marmatite.SEM and EDX analyses of the leaching residue reveal that a product layer composed of iron sulfide, element...