Abstract
In this paper, a new technology was proposed to substantially decrease the high cost of plasma melting of municipal solid waste incineration (MSWI) fly ash(FA) and the mechanism was studied. MSWI FA was leached with water, ammonium chloride (NH4Cl) solution and hydrochloric acid (HCl) solution. X-ray diffraction(XRD) and X-ray fluorescence(XRF) results indicate that soluble chloride, soluble chloride plus Ca (OH)2, and soluble chloride, Ca (OH)2 plus CaCO3 from the ash, were removed, respectively. Their flowing temperatures (FT) were decreased from 1545 °C to 1529 °C,1380 °C and 1197 °C, which is well related to their slag contents calculated with FactSage 7.3. Through FactSage simulation of mineral composition during heating process and the ternary phase diagram of SiO2–CaO–Al2O3, the influence of leaching agents can be attributed to the content of CaO. With the decrease of CaO content, the chemical compositions of the ash move from high liquidus temperature area to low liquidus temperature area. Acid-leaching technology can substantially decrease the cost of plasma melting of MSWI FA by both greatly decreasing the melting temperature and the amount of ash to be molten.
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