Influence of ash composition on heavy metal emissions in ash melting process
Influence of ash composition on heavy metal emissions in ash melting process
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灰渣成分对灰熔化过程中重金属排放的影响
DOI：
10.1016/s0016-2361(02)00041-8
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发表时间：
2002
期刊：
影响因子：
7.4
通讯作者：
Ryo Yoshiie
中科院分区：
文献类型：
--
作者：
Ryo Yoshiie
研究了垃圾衍生燃料（RDF）和汽车粉碎机粉尘（SD）燃烧产生的两种飞灰在氧化和还原条件下熔融过程中重金属的释放规律。对炉渣中重金属的残留形态进行了实验估算。结果证实，在熔化过程中容易释放出几种挥发性重金属。为熔化过程提供的气氛的类型被发现会影响RDF灰中的一些挥发性金属的排放，但在SD灰中不会。在氧化条件下的RDF灰中挥发性重金属的排放量低于本研究中的任何其他条件下。还原条件下RDF灰中铁和重金属的释放行为与SD灰相似。这些事实表明，RDF灰中的磷只有在氧化条件下才具有固定炉渣中挥发性金属的性质。在此基础上，对粉煤灰与磷的混合物进行了熔融试验，试验结果与磷的影响一致。
Two kinds of fly ash, discharged in the combustion of either refused derived fuel (RDF) or car shredder dust (SD), were examined for the emission of heavy metals in melting process under oxidizing and reducing conditions. The residual fractions of heavy metal in slag were experimentally estimated. As a result, it was confirmed that several volatile heavy metals were readily emitted during melting process. The type of atmosphere provided for the melting process was found to affect the emission of some volatile metals in RDF ash, but not in SD ash. The emission of volatile heavy metals in RDF ash under oxidizing conditions was lower than under any other conditions in this study. The emission behavior of iron and heavy metals in RDF ash under reducing conditions was similar to that in SD ash. These facts indicated that phosphorous in RDF ash had the property of fixing the volatile metals in the slag only under oxidizing conditions. Then the mixture of SD ash with phosphorous oxide powder was also tested in a melting process, and the result was consistent with the above inference of the effect of phosphorous.