燃煤电厂排放颗粒物中重金属形态的研究

本文分析用模拟酸雨浸提和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小。

STUDIES ON THE SPECIATION DISTRIBUTION OF HEAVY METALS IN PARTICULATES RELEASED FROM COAL COMBUSTION

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.