Sustainable Mining and Metallurgy

Hazardous waste incineration ash accounts for 15% ~ 25% of the total amount of incineration into the kiln. It is usually sent to hazardous waste landfill for landfill treatment, which has potential environmental risks. The “zero landfill” of ash is the general trend. A hazardous waste disposal center adopts the process of “rotary kiln incineration + electric furnace high temperature melting + washing” to treat organic hazardous waste. The slag from the kiln tail was directly sent to the electric furnace for melting and disposal. The temperature of the molten pool was controlled by reasonable ingredients. The temperature was 1 350 ~ 1 450 ℃ , and the melting products were treated by water quenching process to generate water quenching slag, washing water and flue gas products. The results of acid leaching and water leaching of water quenched slag show that the leaching index of heavy metals meets the national standard, the vitreous content is 98% , which meets the standard requirement of 85% , and can be used as green building materials. The salts entering the water are mainly chloride and sulfate. The degradation efficiency of dioxins in fly ash reached more than 99% . Ash melting disposal technology is an efficient, green advanced technology, which provides a feasible solution for achieving the goal of “zero landfill” of ash.