To fractionally extract a deposit suitable to raw material for zinc wet type smelting containing heavy metal kind at high grade and a deposit containing much gang by wet-treating fly ash for using as the resource and making to harmless.
The wet type treating method for fry ash is treated by going through the following processes, that is, a process for extracting filtrate L1 and gang base residue P1, with which acid-leaching treatment is applied to the fry ash by using hydrochloric acidic solution having ≤pH 3.5 and the solid and the liquid are separated after neutralizing into the range of >pH 3.5 to 5 by adding the neutralizer into this treated solution: a process for extracting filtrate L2 and zinc-rich base residue P2 by separating the solid and the liquid after neutralizing into the range of >pH 5 to 9 by adding the neutralizer into the above filtrate L1: and a process for extracting filtrate L3 and gypsum base residue P3 by separating the solid and the liquid after adding sulfuric acid into the above filtrate L2.
AICHI TARO
ASADA HIROSHI
HACHITSUKA HIDEKI
INOGUCHI KOSUKE
DOI TETSUO
Koji Hagiwara