Open AccessSpeciation of zinc in secondary fly ashes of municipal solid waste at high temperatures
Author(s) -
Yu Meijuan,
Tian Shulei,
Chu Wangsheng,
Chen Dongliang,
Wang Qi,
Wu Ziyu
Publication year - 2009
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049509020032
Subject(s) - zinc , fly ash , vitrification , raw material , chlorine , metallurgy , municipal solid waste , heavy metals , environmental chemistry , melting temperature , environmental science , waste management , chemistry , materials science , medicine , organic chemistry , engineering , composite material , andrology
The evaporation aerosols produced during the vitrification process of municipal solid waste incinerators (MSWI) fly ash represent a potential environmental risk owing to their high content of heavy metals. In this research, high‐temperature heating processes were carried out on fly ashes collected from bag houses in a Chinese MSWI plant and the secondary fly ashes (SFA) were separately collected at three high temperatures (1273 K, 1423 K and 1523 K) below the melting range. Elemental analysis showed that high contents of both zinc and chlorine were present in these SFA samples and, according to the standard of the heavy metals industrial grade of ore, SFAs can be re‐used as metallurgical raw materials or rich ore. Moreover, as shown by XAS analysis and for different high temperatures, zinc environments in the three SFA samples were characterized by the same local structure of the zinc chloride. As a consequence, a zinc recycling procedure can be easily designed based on the configuration information.