Detoxification of hazardous dust with marine sediment

作者：Wei Yu Ling^*; Lin Chang Yuan; Wang H Paul

来源：Marine Pollution Bulletin, 2014, 85(2): 810-815.

DOI：10.1016/j.marpolbul.2014.01.016

• Dioxin
• Marine sediment
• Electric are furnace dust
• EAFD
• Lightweight aggregate

Hazardous electric arc furnace dust containing dioxins/furans and heavy metals is blended with harbor sediment, fired at 950-1100 degrees C to prepare lightweight aggregates. Dust addition can lower the sintering temperature by about 100 degrees C, as compared to a typical industrial process. After firing at 950 degrees C and 1050 degrees C, more than 99.85% of dioxins/furans originally present in the dust have been removed and/or destructed in the mix containing a dust/sediment ratio of 50:100. The heavy metals leached from all fired mixes are far below Taiwan EPA legal limits. The particle density of the lightweight aggregates always decreases with increasing firing temperature. Greater addition of the dust results in a considerably lower particle density (mostly %26lt;2.0 g cm(-3)) fired at 1050 degrees C and 1100 degrees C. However, firing at temperatures lower than 1050 degrees C produces no successful bloating, leading to a denser particle density (%26gt;2.0 g cm(-3)) that is typical of bricks.

• 出版日期2014-8-30