Patent ID: 7635796
Filing Date: 2009-12-22
Classification: B09B

Abstract:
1. A method of removing heavy metals from incinerator fly ashes, comprising: a) Determining a classification of waste and its treating mode of an incinerator, and determining one or more outlets and quantities of original fly ash (OFA) and reacted fly ash (RAE) in an incineration facility; b) Sampling OFA and RFA from their generation positions, and detecting properties of OFA and RFA respectively; c) Calculating heavy metal(s) which exceeds the TCLP standard; d) Determining an optimal mixing ratio of OFA and RFA for two independent outlets, or a quantity of OFA or RFA that should be added with a convergence of OFA and RFA for one outlet; e) Mixing the OFA and the RFA to form a mixed fly ash according to the optimal mixing ratio of step (d): and f) Extracting heavy metals from the mixed fly ash by a liquid to remove the heavy metals.