在鼓泡流化床锅炉(296 MW)中混合燃烧木渣和泥煤产生的底灰和粉煤灰中含有石英(SiO2)、微斜长石(KAlSi3O8)和钠长石(NaAlSi3Os).X射线衍射不能区分从底灰和粉煤灰中释放的相关重金属.为了评估不同环境条件下底灰和粉煤灰中重金属的释放情况,根据BCR工艺将底灰和粉煤灰中的重金属依次萃取和分离成酸性可溶/可交换(CH3COOH)、可还原(NH2OH-HCl)和可氧化(H2O2/CH3COONH4)相,利用冰醋酸萃取组分和重金属总浓度计算从底灰和粉煤灰中浸出重金属的风险评价指数.浸出研究表明,从底灰和粉煤灰中萃取的不同组分中重金属量不同.从环境和利用前景来看,底灰和粉煤灰中的重金属具有不同水平环境污染风险,只有底灰中的砷呈现非常高的风险.底灰中高风险金属是镉,而粉煤灰中的是砷、镉和硒.
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