Chemical looping gasification method for iron-rich sludge

A chemical looping gasification method for iron-rich sludge, comprising:

• subjecting a to-be-processed iron-rich sludge sample to pressure filtration and crushing to produce a first iron-rich sludge particle with a moisture content of 40-50% and a diameter of 0.5-1 mm;
• performing a chemical looping gasification of the first iron-rich sludge particle with an iron-based oxygen carrier and in a fluidized bed reactor to obtain a sludge ash as a supplemental oxygen carrier;
• performing the chemical looping gasification with the supplemental oxygen carrier, the iron-based oxygen carrier and unreacted first iron-rich sludge particle;
• and switching an intake atmosphere of the fluidized bed reactor to air, subjecting the sludge ash to crushing, floatation and discharging, and regenerating the iron-based oxygen carrier and the supplemental oxygen carrier to complete one cycle of chemical looping gasification.