Resource recycling method for phosphorus in sludge with high solid content and iron content

The invention belongs to the technical field of sludge recycling, and particularly relates to a method for recycling phosphorus in sludge with high solid content and iron content. According to the recycling method, anaerobic digestion and acidification are combined for treating the high-solid-content and high-iron-content sludge, the dissolving performance of phosphorus-containing precipitates is changed through acidification treatment, so that a large amount of phosphorus is released, after solid-liquid separation, phosphate fertilizer can be recycled from filtrate in a blue iron ore mode, and the treated sludge can be used for collaborative incineration after being dried. According to the scheme, the acidizing agent cost is saved, the overall phosphorus release efficiency is also improved, the prepared blue iron ore is high in quality, a large number of inorganic metal elements are released through sludge acidification, organic components are still left, and therefore the calorific value of the acidized slu