同槽电解法处理锌—锰废干电池机理研究

针对锌 锰干电池的构成特点 ,结合所采用的研究工艺 ,从试验机理角度对采用同槽电解法处理锌 锰废干电池的工艺方法和工艺条件进行了分析和研究 ,提出了新型的实现废干电池资源化处理技术路线。     

马里亚纳海槽玄武岩K-Ar定年及其地质意义

对马里亚纳海槽弧后扩张脊上所采集的玄武岩样品进行了系统的K -Ar定年 ,同时结合研究玄武岩的微量元素以及稀土元素特征后指出 ,马里亚纳海槽的张开及与之伴随发生的玄武岩浆活动自晚中新世以来一直都在进行 ,其主活动期为 2～ 4Ma。海槽玄武岩年龄在空间上具有从南到北逐渐变新的演化规律。据此 ,推断该海槽的扩张演化可能受控于该区内热区的迁移及运动规律     

槽式太阳能热电站光污染问题分析

槽式太阳能热电站正常运行情况下会不可避免地产生光污染问题。本文分析了槽式太阳能热电站产生光污染的原因以及光污染对人和生态环境产生的影响。在槽式太阳能电站选址阶与运行阶段,分别提出了有效的光污染防治措施,为今后槽式太阳能热电站光污染防治提供了一定的参考依据。     

活性粉末混凝土(RPC)槽形梁模型破坏试验研究

活性粉末混凝土 (RPC)具有高强、高耐久性以及高延展性等特点 ,因此 ,RPC在桥梁中有很好的应用前景。但是当前对RPC桥梁的设计研究很少 ,笔者根据自行研制的RPC ,设计了预应力拼装结构的槽形梁模型 ;并进行了RPC槽形梁模型的破坏试验研究 ,以验证槽形梁模型的承载力及发现设计上存在的问题。通过对模型拼装、预应力张拉及模型加载的试验现象的介绍和对试验结果的分析可知 ,破坏时主梁底部的拉应力远没有达到RPC的抗拉极限强度 ,而主梁腹板和下翼缘连接处的局部承载力不足才是主梁破坏的真正原因。最后 ,在总结裂缝发展和模型破坏的原因的基础上 ,对进一步的模型设计提出了修改意见。     

新型人工湿地污水处理系统复氧效果研究

介绍了新型人工湿地的工艺特点,并对自然跌水复氧和自然沟槽复氧两种复氧方式的复氧效果进行试验研究,结果表明：1．5m高的跌水,其复氧量在2．2mg/L-3．3mg/L之间,且由复氧数学模型得出复氧的预测值与实测值基本一致;沟槽的复氧效果与槽长呈正比关系,且4m沟槽的复氧量可达到3．0mg/L;试验得出跌水复氧的效果要优于沟槽复氧。     

Trace element geochemistry of the Keana brines field,middle Benue trough,Nigeria

A trace elements study of various samples from the Keana brines field, middle Benue Trough was carried-out to determine the extent to which Pb–Zn–S and BaSO₄ mineralisations have affected the quality of the brines and the waters in the area. Different sample media such as well-water, pond water, brine spring pool water, stream water, stream sediments etc. were analysed. Geochemical results show that Cu, Zn, Pb, As and S are concentrated in the waters (0.3, 0.36, 0.05, 0.07 and 1 1.5 ppm respectively). These elements are more concentrated in both the spring and pond waters, suggesting that the spring water could have acted as the transport medium for these elements released from deep-seated sources. Transitions elements (Ti, V, Cr, Fe, Co, Ni and Sr) are concentrated in the waters. Compared to the World Health Organization (WHO) admissible limits, the well waters present very high concentrations in Cd (0.56 ppm) and Sb (0.40 ppm) (200× and 70× WHO admissible values respectively). There is a preferential concentration of transition elements (Ti, V, Fe, Co and Ni) in the sediments (41.38, 362, 52.21, 269 and 54 ppm respectively) than in the waters (0.70, 0.05, 5.6, 0.04 and 0.02 ppm respectively). Similarly, Cu, Zn, Pb and As are concentrated in the sediments (44, 72, 41 and 14 ppm respectively). The concentrations of transition elements (Ti, V, Cr, Fe, Co and Ni) in the refined salt were highly elevated (784, 363, 283, 105, 59.2 and 42.6 ppm respectively) (7000–10,000× well water). Similarly, the concentrations of As, Pb, Br and Sr in the refined salt were also alarming (11.6, 16.4, 16.4 and 122 ppm respectively), (1000, 700, 3000 and 20,000× well water values respectively). S on the other hand is absent. One of the striking features is the absence of I, Cd, Sb and Se in the refined salt crystals which were detected in the waters and the brines. Compared to WHO admissible values, the refined salt crystal concentrations for Ni (426 ppm) and Cr (283 ppm) were also very high (2000× WHO values respectively) and to a lesser extent Cu (26.9 ppm) and Zn (21.7 ppm) (12 and 7× WHO values respectively).