Method for recycling rare earth mineral from rare earth tailing with high fine grained iron mud content

Abstract

The invention discloses a method for recycling rare earth mineral from rare earth tailing with the high fine grained ion mud content. The problems that fluorocarbon cerium type rare earth ore with the high iron content, high mud content and uneven rare earth mineral size distribution is prone to excessive grinding, iron and mud affect the rare earth concentrate grade and recycling rate, and the mineral processing cost is high are solved. The method comprises the specific steps that rare earth tailing is screened and graded in advance (d=0.25 mm); the rare earth tailing with the diameter larger than +0.25mm is ground till the diameter is -0.25mm and combined with the product which is graded in advance to have the diameter of -0.25mm; secondary hydrocyclone grading is carried out (d=0.038mm); the 0.25mm-0.038mm product bar medium high-gradient magnetic separation-table reselection combined technology is adopted for recycling coarse grained rare earth tailing; the product with the diameter smaller than 0.038mm is subjected to 1.5mm mesh medium high-gradient magnetic selection; and reselected tailing is ground again till the -200-mesh tailing accounts for 75% and combined with magnetic concentrate with the diameter smaller than 0.038mm, and rare earth mine is recycled in a flotation mode. The method is applicable to mineral processing production of fluorocarbon cerium type rare earth ore with the high iron content, high mud content and uneven rare earth mineral size distribution.

Description

[0001] Technical field: [0002] The invention relates to a method for recovering rare earth ore from tailings of bastnaesium type rare earth ore with high iron content, heavy mud content and uneven particle size distribution of rare earth minerals, and is especially suitable for recovering bastnaesite type rare earth ore from this type of raw ore. [0003] Background technique: [0004] At present, the production processes of bastnaesium type rare earth ores in my country mainly include fine crushing (coarse grinding)-single gravity separation process, fine crushing (coarse grinding)-gravity separation-dry magnetic separation combined process, raw ore fine grinding flotation-high gradient magnetic separation combined process Process, crude ore coarse grinding - classification - coarse-grained strong magnetic separation - strong magnetic concentrate regrinding and fine-grained combined flotation process, raw ore fine grinding - weak magnetic separation to recover iron minerals - ...

AI Technical Summary

Problems solved by technology

[0004] At present, the production processes of bastnaesium type rare earth ores in my country mainly include fine crushing (coarse grinding)-single gravity separation process, fine crushing (coarse grinding)-gravity separation-dry magnetic separation combined process, raw ore fine grinding flotation-high gradient magnetic separation combined process Process, crude ore coarse grinding - classification - coarse-grained strong magnetic separation - strong magnetic concentrate regrinding and fine-grained combined flotation process, raw ore fine grinding - weak magnetic separation to recover iron minerals - strong magnetic recovery of rare earth minerals - Strong magnetic concentrate regrinding and heating flotation combined process; there are many studies on the recovery of rare earth minerals from rare earth tailings, but they all focus on the research and development of flotation and flotation agents, and it is difficult to solve the problem of bastnaesite rare earth ore in the grinding process. The phenomenon of over-grinding in the mining process and the recovery of bastnaesite in the -0.038mm particle size are difficult, and the production cost is high, so it is difficult to realize in production

[0005] The amount of rare earth resources in Sichuan Province ranks second in the country. However, from the end of the 1980s to the first decade of this century, for more than 20 years, the development of rare earths in Sichuan has been indiscriminate and indiscriminate mining, rich and poor, family workshops, and production techniques. Primitive and other disorderly operations are serious, tailings and waste rocks are piled up everywhere, blocking rivers and ditches, causing great environmental pollution

Due to the finer granularity of valuable components in rare earth tailings and the more complicated co-associated relationship, there is no good, low-cost, and easy-to-manufacture process to treat this type of rare earth tailings

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