【摘要】 本文分别用模拟酸雨浸提和Tessier形态分离法,对燃煤电厂排放颗粒物中重金属形态进行了研究.结果表明,痕量金属绝大部分以稳定态存在,微米级飞灰中有较大活性的形态高于灰渣,煤燃烧高温条件使颗粒物中活性较大的形态含量减少.随酸雨pH降低,颗粒物中金属溶出量增加;pH相同,浸取液中盐含量高时,金属溶出量增加.以上研究表明吸附-解吸、pH值、氧化还原条件和固-液界面离子交换等多种因素决定着颗粒物中重金属的溶出.更多还原

【Abstract】 Simulated acid rain extraction and Tessier sequential speciation separation methods were used in the studies of speciation distribution of some heavy metals in particulates released from coal combustion in power plant. The results showed that most parts of the heavy metals in particulates are stable. The content of labile species in micrometer fly ash are much higher than those in dreg. Under different circumstance of combustion distribution of elements were found to be different. The labile species in particulates under high temperature of combustion are less than those under low temperature. Metals released increase with decreasing of pH and concentration of salt in leaching reagents. These results can be interpreted by the effects of sorption-desorption, pH of leaching reagent, oxidation-reduction condition and ion-exchange in the solid-liquid interface.更多还原