Magnetic phosphorus recovery agent based on steel slag modification and preparation method thereof

The invention belongs to the technical field of solid waste resource utilization, and relates to a preparation method of a magnetic phosphorus recovery agent based on steel slag modification, which comprises the following steps: proportioning the following raw materials in parts by mass: 100 parts of steel slag, 10-20 parts of metal hydroxide and 5-10 parts of dispersing agent; the method comprises the following steps: uniformly mixing steel slag and metal hydroxide solid powder, adding a dispersing agent, and performing ultrasonic treatment to obtain turbid liquid; grinding the turbid liquid, and then carrying out solid-liquid separation to obtain a solid substance; and washing and drying the obtained solid substance, calcining at 600-800 DEG C for 2-6 hours, and cooling to room temperature to obtain the magnetic phosphorus recovery agent. The steel slag and the hydroxide are subjected to solid-phase mixing, the steel slag is modified by adopting a ball milling-calcining combination method, the low-concentra