34 無灰炭製造プロセスにおけるヒ素の分配挙動評価(微量元素,灰利用)

概要

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Ash-free coal production process has been developed, based on organic solvent extraction of the coal. This ash-free coal, called Hyper-coal (HPC), is expected to be separated from hazardous heavy metals as well as ash contents. Therefore it was important to understand the distribution behavior of heavy metals, such as mercury, arsenic and selenium, in this process. In particular, arsenic and selenium is easier to react with organic matter than mercury and other heavy metals. Then distribution behavior of arsenic in ash-free coal process was investigated in this study. Coal, HPC and various intermediate products sampled from HPC production process were dissolved by fusion method. Arsenic in them were analyzed by HG/ICP/AES (Hydride Generation Inductively Coupled Plasma-Atomic Emission Spectrometry). As the result, arsenic mass balance between input and output was successfully estimated with an accuracy of 10%. Arsenic concentration of HPC drastically decreased as compared with raw coal. From the correlation between distribution of ash and arsenic, it was considered that arsenic was dominantly bonded with the inorganic compound.
社団法人日本エネルギー学会の論文
2007-10-11