Lanthanum-iron composite oxide modified steel residue ceramsite and applications thereof

The invention discloses lanthanum-iron composite oxide modified steel residue ceramsite, which is prepared by roasting the following raw materials by mass: 50-80% of lanthanum-iron composite oxide modified steel residue, 15-30% of a binder, and 5-20% of a pore-forming agent. According to the present invention, with the application of the lanthanum-iron composite oxide modified steel residue ceramsite in phosphorus removal, phosphate in a water body can be efficiently adsorbed in a short time, the phosphorus removal rate is up to more than 99%, and the phosphorus removal effect is basically notaffected by the pH value of the water body and the common anions, such that the lanthanum-iron composite oxide modified steel residue ceramsite can be used in eutrophic water body restoration, constructed wetland enhanced phosphorus removal or sewage/wastewater deep treatment and the like; and the raw materials are wide in source and low in price, and the industrial waste is fully utilized to reduce the environment pollu