A method for removing elements, including heavy metals, from fly ash and from fly ash resulting from removal of SOx/NOx from flue gas using Na2CO3/NaHCO3/trona, is described. An aqueous suspension of the fly ash and/or a solution of the leachate from the fly ash is treated with dissolved ferrous compounds, such as FeSO4.7H2O and/or FeCl2.4H2O, at a chosen initial acidic pH, and the precipitation of the ferrous ions as the solution basifies sequesters the trace elements.
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机译：一种使用Na 2 <去除烟气中的SO x / NO x 而产生的粉煤灰和粉煤灰中的重金属元素的方法描述/ Sub> CO 3 / NaHCO 3 /天然碱。粉煤灰的水悬浮液和/或粉煤灰的沥出液溶液用溶解的亚铁化合物处理，例如FeSO 4 .7H 2 O和/或FeCl 2 .4H 2 O，在选定的初始酸性pH值下，溶液中的亚铁离子的沉淀会螯合微量元素。
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