奥斯麦特炉处理废杂铜技术评析

随着世界经济的高速发展，对铜的需求量不断增加。急速膨胀的铜消费给现有的采、选、冶等铜生产环节带来了不同程度的压力和影响，也加速了不可再生性矿产资源的枯竭，成为制约社会和经济可持续发展的重要因素。为缓解资源、能源及环境的压力，各国都在不断加大对废铜的循环利用。据统计，近20年来，美国消费的所有铜及铜产品中，约有50％～60％来自废铜的再生，再生铜占铜消费的半壁江山。除此之外，在处理废杂铜过程中，还能综合回收金银等贵金属，经济效益十分可观。     

中日报废汽车行业合作前景十分广阔

权威数据显示,截止2012年年底,我国汽车保有量约为1.2亿辆,仅次于美国位居世界第二.今后报废汽车数量将呈爆炸性增长.国际上,特别是日本的企业非常看好中国报废汽车的市场前景.纵观国内行业,既能够满足政府环保标准及相关报废汽车处理规定,又拥有相关技术知识、资金的报废汽车处理企业很少.同时,随着国内汽车市场不断扩大,报废汽车引发的安全、环境污染、资源问题以及汽车再制造产业广阔的前景,受到越来越多的重视.     

Impact of core electron temperature on current profile broadening with radio-frequency wave heating and current drive in EAST

In recent EAST experiments, current profile broadening characterized by reduced internal inductance has been achieved by utilizing radio-frequency current drives (RFCD). In contrast to previous density scan experiments, which showed an outward shift of the current density profile of lower hybrid current drive (LHCD) in higher plasma density, the core electron temperature (Te(0)) is found to affect the LHCD current profile as well. According to equilibrium reconstruction, a significant increase in on-axis safety factor (q0) from 2.05 to 3.41 is observed by careful arrangement of RFCD. Simulations using ray-tracing code GENRAY and Fokker–Planck code CQL3D have been performed to thoroughly analyze the LHCD current profile, revealing the sensitivity of the LHCD current profile to Te(0). The LHCD current density tends to accumulate in the plasma core with higher current drive efficiency benefiting from higher Te(0). With a lower Te(0), the LHCD current profile broadens due to off-axis deposition of power density. The sensitivity of the power deposition and current profile of LHCD to Te(0) provides a promising way to effectively optimize current profile via control of the core electron temperature.