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Erschienen in:
2016 | OriginalPaper | Buchkapitel
Reduction Strategies for PFC Emissions from Chinese Smelters
verfasst von : Li Wangxing, Chen Xiping, Qiu Shilin, Zhang Baowei, Chris Bayliss
Erschienen in: Light Metals 2013
Verlag: Springer International Publishing
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Perfluorocarbon (PFC) formation mechanism was investigated and strategies for PFC reduction in China were developed. Alumina concentration in bath has a strong effect on PFC evolution. Anodic overvoltage and current density also have an obvious influence on PFC. Narrow alumina concentration controlling mode, small dose feeding mode, alumina level preestimating and verifying mode were developed in order to reduce PFC emissions. PFC can be reduced by keeping alumina level in bath in the range between 2% and 3%, not low enough to cause anode effect or high enough to deposit in cells. Small dose feeding mode controls both fixed and movable small dose feeders, which can supply alumina into cells at right time. Alumina level preestimating & verifying mode includes pre-estimating modules and verifying modules, which can calculate alumina level by equations related to anodic current density and alumina concentration. If alumina is low, numerical modules will send feeding command to feeders.