Abstract: Disclosed are a method for recycling an iron ore tailing and use thereof. The method includes: 1) conditioning the iron ore tailing to obtain a first slurry, adding water glass and a sodium oleate-associated substance sequentially to the first slurry to obtain a first mixture, and subjecting the first mixture to first flotation to obtain a mixed flotation foam product and a mixed flotation grit; 2) filtering the mixed flotation foam product to obtain a solid, drying, roasting at 400° C. to 650° C., and grinding to obtain a ground product; and 3) conditioning the ground product to obtain a second slurry, adding sodium sulfide, water glass, sodium alginate, hydroxamic acid, and terpenic oil sequentially to the second slurry to obtain a second mixture, and subjecting the second mixture to second flotation to obtain a rare earth concentrate and a rare earth tailing.

Abstract: The present invention discloses a ring dryer, comprising a housing, a top cover provided at the top of the housing, and a base provided at the bottom of the housing, and further comprising a feeding system into which the material to be dried flows, a material coating assembly, a material extrusion assembly, a discharging scraper, and at least two cylinders with different radii, wherein each of the cylinders is provided with a heat medium flow path inside, an annular groove is formed between the adjacent cylinders, and a material outlet is provided at a free end of the feeding system; the material to be dried in the feeding system flows into the annular groove along the material outlet; the material coating assembly, the material extrusion assembly and the discharging scraper are movably arranged in the annular groove and can move along the annular groove relative to the cylinders; and a blade of the discharging scraper is respectively in contact with an inner circumferential surface of the cylinder and an out