Patent ID: 6761858
Filing Date: 2004-07-13
Classification: B02C,B03B,B09B,C22B,Y02P

Abstract:
A method for processing materials comprising ashes of waste incineration plants and mineral residues by removing therefrom salts and by artificial aging by washing with process water, said method comprising the steps of:transporting said material by a transport device from a collection structure upwardly into a reaction container filled with process liquid, during the upward transport of said material, conducting process liquid from said reaction container down said transport device in counter-flow relation to said material being transported upwardly, such that salts are washed off said material and are dissolved into said process liquid and flushed back into said collection structure (countercurrent-desalting) from where saturated liquid is collected, generating in said reaction container, between electrodes disposed in said reaction container, pulsed electrodynamic high voltage spark discharges in a predetermined number and repetition rate thereby generating shock waves to which said material is exposed, said electrodynamic high voltage spark discharges being performed within the following parameter ranges: electric field strength 100 to 300 kV/cm, impulse increase time not more than 500 ns the high voltage spark discharges formed generating shock wave so with a power dissipation of 120 to 400 J per centimeter discharge path, providing path, which shock wave causes liquid soluble components of said material to be released into the process water with which they are conducted away,said high voltage spark-generated shock waves inducing plasma processes forming hydroxyl radicals which oxidize and passivate material particles such that, in the processed material, heavy metal ion concentrations are reduced to such an extent that the processed material deposited under class 1 waste material deposition requirements, removing the processed material which has settled on the bottom of the reaction container and transporting it upwardly through a second transport device for deposition in a holding containment, and conducting fresh process liquid down said second transport device for final washing of said material in counter-flow with said fresh liquid.