Fly ash chlorine fixation and heavy metal stabilization method

The invention discloses a fly ash chlorine fixation and heavy metal stabilization method, and belongs to the technical field of hazardous waste treatment. The method comprises the following steps: S1, mixing fly ash, red mud, steel slag powder, fly ash and limestone, carrying out ball milling, adding water, and carrying out sealed aging to obtain an aged mixture; s2, the aged mixture obtained in the step S1 is subjected to segmented roasting, specifically, the temperature is kept at 103-110 DEG C for 30-120 min, then the temperature is rapidly increased to 650 DEG C or above, the temperature is continuously and slowly increased to 700-900 DEG C, the temperature is kept at the constant temperature for 1-3 h, then the temperature is cooled to the room temperature, and a roasted mixture is obtained; and S3, adding water into the roasting mixture obtained in the step S2, and forming and curing to obtain the fly ash solidified body. According to the method, soluble chlorine salt can be converted into multiple inso