排序方式: 共有24条查询结果,搜索用时 390 毫秒
1.
深圳市线路板蚀刻废液中铜、砷、铅、汞、镉含量调查 总被引:2,自引:0,他引:2
吴小令 《中国资源综合利用》2005,(6):21-23,28
对深圳市60家线路板企业含铜蚀刻废液中铜、砷、铅、汞、镉含量的检测结果显示:酸、碱性蚀刻废液铜含量范围分别为38.6~167.9g/L、53.7~171.8g/L,,通过测量比重推算铜含量适用于碱性废液但不适合酸性废液.56个样品可检出砷(大于3mg/L).56个样品未检出铅(小于5mg/L),其余4个铅含量偏高.所有样品汞、镉均未检出,含量分别小于4mg/L、0.3 mg/L.将各样品砷、铅、汞、镉含量实测值换算为铜含量100ga.时的相对值后发现,上述四元素在蚀刻废液中的正常值分别为<12mgAs/L、<5 mg Pb/L、<4 mg Hg/L、<0.3 mg Cd/L. 相似文献
2.
建立全自动测汞仪法检测食品、化妆品中汞含量。通过优化实验条件提高方法灵敏度、准确度和精密度。方法检出限为0.0803ng,加标回收率为89%~104%,RSD值在2.2%~4.5%之间。本方法操作简便,具有高灵敏度、准确度和精密度,可满足口岸快速通关检测要求。 相似文献
3.
利用现有控制技术来协同控制汞污染是一项科学、合理、经济的技术措施。目前普遍认为脱硫系统对脱汞有着较大去除潜力,但脱硫系统对脱汞的影响大小及影响特性有着较大的不确定性,分析了脱硫系统各运行因素对汞的影响特性及汞的二次污染等问题,为科学合理的制定汞排放技术提供参考。 相似文献
4.
S. Mark Wilhelm 《Process Safety Progress》2009,28(3):259-266
Brazed aluminum plate-fin heat exchangers are extensively used in gas separation processes including LNG, LPG, NGL, nitrogen rejection and olefins manufacture. In situations where mercury is a trace component of feed gas or liquid feeds to crackers, condensation of liquid or precipitation of solid mercury can occur in heat exchanger passes, even with functional mercury removal systems in place. Mercury in liquid phase causes, under certain well-defined conditions, liquid metal embrittlement of susceptible metallurgy or amalgam corrosion of core fins, both of which can lead to sudden loss of pressure containment. Mercury-contaminated aluminum heat exchangers require close scrutiny and quantitative risk assessment to allow safe operation, remediation or to justify replacement. The risk analysis procedure involves computational prediction of mercury deposition, inspection of critical areas, detailed assessment of metallurgy and fabrication, strain analysis of temperature changes during trips and shutdowns and oxide fatigue analysis. Assigning probability of equipment failure requires a complete understanding of the mechanisms of liquid metal embrittlement and amalgam corrosion that operate on aluminum plate-fin heat exchangers. Statistical correlations to known failures are essential to assignment of probability-based risk factors. Probabilities of leak and rupture failure modes can be estimated using amounts and locations of mercury deposits determined from focused inspection or calculated thermodynamically. © 2009 American Institute of Chemical Engineers Process Saf Prog, 2009 相似文献
5.
6.
7.
介绍了煤中汞燃烧后的排放形态,并较为详细地论述了各种汞排放控制技术,同时对烟气脱汞技术进行了展望。认为,加强对汞产生源头控制,加强对新型吸附剂的研究,可以实现大幅度脱除烟气中汞的目标。 相似文献
8.
9.
10.
燃煤电厂汞排放控制技术的研究进展 总被引:1,自引:0,他引:1
燃煤是最大的汞排放源,在此介绍了燃煤电厂汞排放及其迁移转化规律、燃煤过程中汞的存在形态及影响汞去除率的主要因素;分析了燃烧前脱汞、燃烧中脱汞、燃烧后脱汞等方面的技术;较为详细地论述了汞排放控制技术现状及研究进展。 相似文献