METHOD AND APPARATUS FOR MAKING HEAVY METAL CONTAINING MATERIAL HARMLESS

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for making harmless a heavy metal containing material which enable simplification of supply of a chlorine-containing material from outside the treatment system and can control minimally the residue of heavy metals after treatment by keeping high the efficiency of removing heavy metals. SOLUTION: An apparatus for making harmless a heavy metal containing material consists of a hopper 23 for mixing burned ash 30 containing heavy metals with a chlorine-containing material 32 and a rotary kiln 10 which heats the burned ash 30 to chlorinate the heavy metals and volatilizes the chlorinated products thermally in order to separate and remove the heavy metals. The chlorine-containing material 32 to be charged into the hopper 23 is formed into a chlorine-containing solution containing hydrochloric acid or a slurry containing a crushed chlorine-containing solid, and a drier 26 is arranged in the upstream of the hopper 23 in the direction of charging of the burned ash 30 so as to control the water content of the burned ash 30 equal to or lower than a predetermined water content or within a target range of water contents. COPYRIGHT: (C)2009,JPO&INPIT