Method for separating rare-earth resource from rear-earth slag by virtue of supergravity

Abstract

The invention discloses a method for separating a rare-earth resource from rear-earth slag by virtue of supergravity, and the method comprises the following steps: step 1, cooling molten rare-earth slag within a temperature range of 1150-1300 DEG C at a cooling speed smaller than 2 DEG C / min to obtain thermally treated rare-earth slag; step 2, treating the thermally treated rare-earth slag by means of centrifugal gravitational separation. By virtue of centrifugal gravitational separation, a rare earth ore concentrate of which the cefluosil grade is 80%-93% can be obtained, and the recovery rate of rare earth in the rare-earth slag is as high as 85%-90%. In tailings, the main phase is calcium fluoride and barium fluorophlogopite containing rare earth, which can be used for replacing partial fluorite for recycling calcium fluoride, and meanwhile the tailings can be directly used as a raw material for extracting Sc2O3 and Eu2O3 by virtue of a wet method. The method disclosed by the invention has the advantages of realizing directional concentration of small and dispersed cefluosil in the rare-earth slag by virtue of supergravity, increasing the yield and quality of a product Ce2O3, and meanwhile recycling the fluorite, Sc2O3 and the Eu2O3 from the tailings. The method disclosed by the invention can be used for not only solving the environmental load problems caused by the rare-earth slag but also realizing comprehensive utilization of the rare-earth slag resources.

Description

technical field [0001] The invention relates to efficient separation and utilization of symbiotic resources in the field of metallurgy, in particular to a method for separating rare earth resources from rare earth slag under high gravity conditions. Background technique [0002] The Baiyun Obo Mine in Baotou is a large-scale polymetallic symbiotic deposit containing iron, rare earth, niobium and fluorine, which is unique to my country, and its rare earth reserves rank first in the world. At present, the fluorite-type medium-lean ores (low in iron content and high in rare earth and fluorine content) in the main and eastern mining areas are directly smelted in the blast furnace without beneficiation, and almost all the rare earths are not reduced and enter the slag to be enriched, and the rare earths in the slag are oxidized Object R X o Y The content is about 15%, and there is only one rare earth mineral, cerium fluorosilica. In addition, there is a flake mineral rich in s...

AI Technical Summary

Problems solved by technology

Obviously, the recovery rate of rare earth resources in the concentrate obtained by the existing beneficiation process is relatively low

At the same time, before gravity separation, magnetic separation, and flotation of rare earth-rich slag, it needs to be ground first to dissociate the individual mineral phases. This process is expensive to grind and will cause the main rare earth mineral phases The cerium fluorosilica phase is crushed into fine grains, which reduces the recovery rate of rare earth resources in rare earth slag

In addition, the amount of chemicals used in the flotation process is large, which is easy to pollute the environment

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