氧化亚铁硫杆菌紫外线诱变及对低品位黄铜矿的浸出

介绍了紫外线辐照诱变原理。对一株优势氧化亚铁硫杆菌T Y 菌进行了诱变试验, 研究了诱变T Y 菌对黄铜矿的浸出效果。结果表明, 紫外线辐照能够对浸矿细菌T Y 菌产生明显的变异, 提高T Y 菌菌种的活性。诱变T Y 菌对黄铜矿的浸出率比原始T Y 菌提高了46%以上, 到达浸出终点的时间比原始菌缩短了5 ～10 d, 诱变T Y 菌能更好地氧化浸出黄铜矿。     

物理诱变氧化亚铁硫杆菌及浸出低品位黄铜矿的研究

分别利用紫外线和微波对优势氧化亚铁硫杆菌进行物理诱变,并用诱变菌对低品位黄铜矿进行生物浸出。结果表明,T．f菌经紫外线和微波辐照诱变后,诱变菌与原始菌相比,活性分别提高了44％和34．2％,对黄铜矿的浸出率分别提高了41．4％和27．4％,达到浸出终点的时间比原始菌减少了5～10d。诱变后的T．f菌比较适合低品位黄铜矿的浸出。     

氧化铁硫杆菌的亚硝酸化学诱变及对黄铜矿的生物浸出

报道了亚硝酸化学诱变原理、对一株优势氧化铁硫杆菌T .f菌的诱变作用和诱变T .f菌对低品位黄铜矿的生物浸出研究结果。结果表明 ,T .f菌亚硝酸化学诱变后 ,诱变T .f菌和原始T .f菌相比 ,活性提高了 41.0 3 % ,对黄铜矿的浸出率提高了 13 .3 % ,达到浸出终点的时间比原始菌减少了 5～ 10d。诱变后的T .f菌对黄铜矿比原始T .f菌具有更好的浸出效果     

硫杆菌的化学诱变及对低品位黄铜矿的浸出

用盐酸羟胺将氧化铁硫杆菌优势菌(T、f菌)化学诱变后对低品位黄铜矿进行细菌浸出，结果表明，盐酸羟胺化学诱变能够使T．f菌产生较明显的变异，能较好地提高菌种的活性和对低品位黄铜矿的牛物浸出性能。经盐酸羟胺化学诱变，T．f诱变菌的活性比原始T．f菌提高了57．4％，对黄铜矿的浸出率提高了11．5％，达到浸出终点的时间比原始T．f菌减少了5～10d。     

中高温浸矿菌结合对高砷铜精矿的浸出研究

利用自主选育的耐高砷中高温浸矿菌浸出以砷黝铜矿为主的高砷铜精矿(As 4%～5%, Cu＞20%)。采用前期中温浸矿菌, 后期高温浸矿菌的两段法生物浸出10 d, 总铜浸出率可达90.01%。对浸渣的铜物相分析可知: 高温菌对黄铜矿的浸出率可达78.45%, 是中温浸矿菌14.2%的5.5倍以上; 对砷黝铜矿的浸出率为33.42%, 约为中温浸矿菌17.48%的2倍。对原生硫化铜矿的浸出率总计为50.24%, 约为中温浸矿菌16.26%的3倍。高温菌对砷黝铜矿的氧化作用较黄铜矿差; 中温浸矿菌对As³⁺ 和As⁵⁺的耐受力比高温菌强。在两段法浸出前期添加2.0 g/L的 Fe³⁺ 或2.5%的黄铁矿精矿细菌培养液均能提高中温浸矿菌的浸出速率。     

固定化细胞移动床浸出高硫高铁低铜难选铜矿中铜的研究

利用自制载体将T.f和T.t菌固定起来,并应用于高硫高铁低铜矿的浸出研究中,研究固定化浸矿系统的效果、特点.实验结果表明:在相同的浸提时间(18d)内,T.f和T.t菌混合固定后浸提系统,比非固定化浸系统要高出16.7％;而且固定混合菌群的浸矿效果要优于固定单一菌群的浸矿效果,T.f和T.t菌混合固定的比例为1∶2.     

嗜酸氧化亚铁硫杆菌对低品位磷矿的生物浸出研究

从安徽省某煤矿酸性水中分离培养出嗜酸氧化亚铁硫杆菌(At f), 研究了不同能源物质对其产酸能力的影响。采用微波物理诱变的手段对氧化亚铁硫杆菌进行育种, 并与原菌进行了浸矿对比试验。结果表明, 使用经过诱变的微生物浸出低品位磷矿可以达到比原菌更好的浸出效果。采用Zeta电位测定的方法分析了At f菌对产酸和浸矿的影响。     

氧化亚铁硫杆菌的驯化与诱变选育

以高含量的硫化物金精矿为驯化介质 ,将驯化后的氧化亚铁硫杆菌 (T.f菌 )用紫外线、微波作为诱变剂进行选育 ,经过诱变选育的 T.f菌的氧化活性由未被驯化、诱变前的 0 .0 7g/L· h提高到 3.18g/L·h;氧化活性提高了 4 0多倍 ,有效地提高了氧化亚铁硫杆菌对硫化物的氧化分解能力 ,为优势浸矿菌种的选育提供了简便、有效的育种手段     

中温及嗜热菌对不同成因黄铜矿浸出行为的影响

以斑岩型黄铜矿和矽卡岩型黄铜矿为研究对象,考察了嗜酸氧化亚铁微螺菌(L f)和嗜热硫氧化硫化杆菌(S t)对不同成因黄铜矿浸出行为的影响。结果表明,在2种不同细菌浸出体系中矽卡岩型黄铜矿均表现出比斑岩型黄铜矿浸出率高;S t浸出2种不同成因黄铜矿的效率均比L f的好。通过对不同浸矿时间黄铜矿浸出渣的XRD检测并结合黄铜矿浸出过程反应步骤的分析表明,2种细菌浸出不同成因黄铜矿的机制相同,细菌的代谢途径及反应温度是影响同类成因黄铜矿浸出率和代谢产物差异的主要原因。S t作用下浸出后期黄铜矿表面有黄钾铁矾生成,而L f浸出体系黄铜矿表面主要是S的不断积累。同种浸矿菌种浸出不同成因黄铜矿时,矽卡岩型黄铜矿在浸出第15 d有S生成,斑岩型黄铜矿在S t浸出体系S生成的时间更晚,在L f浸出体系S的生成量则更少,推测矿物性质是引起其差异的主要原因。     

细菌浸出金川含镍磁黄铁矿混合精矿的研究

细菌浸出金川含镍磁黄铁矿混合精矿的研究结果表明,用适量的硫酸预浸出吉镍磁黄铁矿混合精矿,可以加快细菌浸出的反应速度.用氧化亚铁硫杆菌(T.f.)与氧化硫硫杆菌(T.t.)混合菌株(按11接种量比)进行浸出的效果,稍高于单一T.f.菌株的浸出效果.经含镍磁黄铁矿混合精矿矿浆驯化后的T.f.菌株,比原菌株的浸出效果有明显提高,浸出10天的镍、钴、铜和镁的浸出率分别达到88%、78%、40%和45%,镁的溶出主要与体系的酸度有关.细菌浸出硫化矿物的次序是含镍磁黄铁矿＞镍黄铁矿＞黄铜矿.脉石矿物被酸溶浸的次序是绿泥石、方解石＞蛇纹石＞橄榄石＞透闪石、滑石.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586