TREATMENT OF FLY ASH PRODUCED BY WASTE INCINERATOR AND CONTAINING CHLORIDES OF TOXIC METALS

摘要

PROBLEM TO BE SOLVED: To detoxicate fly ash produced from a waste incinerator and contg. chlorides of toxic metals by subjecting the fly ash to a phosphating reaction by adding a reactant comprising a phosphorous compd. which is a nonmetallic compd. and discharging the obtained chlorinated products in a gaseous form. ;SOLUTION: A reactant contg. phosphorous in a suitable form is introduced to a reactor 1 by using an inlet pipe 2, or may be introduced by using a burner 3 for heating the interior of the reactor 1. The fly ash is introduced into the reactor 1 from another inlet pipe 4. Then, phosphated ash falls down to the bottom of the reactor 1, then the phosphated ash is extracted by using a sliding box or an automatic extractor 5. While gases produced in the reaction are discharged through an exhaust pipe 6, after passing through a fume cooling apparatus 8, the gases are introduced into a dust catcher 7. Then fumes without contg. dust are passed through a system 11 for neutralizing acidic gases by using a pipe 10. By the process, the fly ash produced by waste incinerator and contg. chlorides of toxic metals is made to be harmless.;COPYRIGHT: (C)1996,JPO