2.2. Fly ash washing process In order to understand the changes in the characteristics of the
MSWI fly ash after being in contact with water,
washing experiments were conducted first.
The fly ash was mixed with deionized water (at a fly ash-to-water ratio of 1:9) and then blended with an electric scrubber at 500 rpm for 10 min.
In addition, quartz sand with a particle size of 0.3–0.6 mm was employed as a dense medium,
and the weight ratio of quartz sand to fly ash was 1:1.