PROCESS AND APPARATUS FOR THE WETTING, CHEMICAL FIXATION AND DUST FREE CONVEYING OF FLY ASH AND RESIDUES

摘要

A process for the wetting and chemical fixation of heavy metals and an apparatus for the dust-free conveying of fly ash resulting from the incineration of municipal solid waste. In the apparatus aspect of this invention, the fly ash and residues produced from the incinerator contain reacted and unreacted lime products. These materials are collected in the boiler hoppers and hoppers of the air pollution control devices and is conveyed, dust free, either mechanically or pneumatically to a surge silo. The fly ash and residues from the surge silo are then mixed with water and chemical fixation solids or liquids by an automatic controlled batching process in a rotary mixer. A partly agglomerator dustfree product which produces no free-water results and the product is discharged to a conveyor for utilization or eventual disposal in a landfill.