Method for preparing alkaline Fenton-like catalyst from sludge and red mud and method for applying alkaline Fenton-like catalyst to recovery of phosphorus in sludge

The invention discloses a method for preparing an alkaline Fenton-like catalyst by using sludge and red mud, the alkaline Fenton-like catalyst and a method for recovering phosphorus from the sludge, and the alkaline Fenton-like catalyst is prepared according to the following steps: centrifugally dewatering the sludge in a concentration tank, then drying in a drying oven, grinding the dried sludge into powder, and sieving for later use; drying the red mud, grinding into powder, and sieving for later use; the preparation method comprises the following steps: uniformly mixing sludge powder and red mud powder in a mass ratio of 1: (0.8-1.2), putting the mixture into a tubular furnace, sintering at 900 DEG C for 1.5-2 hours under the protection of nitrogen, and cooling to room temperature to obtain black powder, namely the alkaline Fenton-like catalyst. The preparation process is simple, and no external reagent is added. When the catalyst is applied to wall breaking of the sludge, acid does not need to be added, a