A method for separating rare earth resources in rare earth slag by supergravity

Abstract

The present invention proposes a method for separating rare earth resources from rare earth slag by supergravity. The method includes the following steps: step 1, cooling the molten rare earth slag at a cooling rate of less than 2°C / min in the temperature range of 1300-1150°C to obtain heat-treated rare earth slag; step 2, performing centrifugal supergravity separation on the heat-treated rare earth slag. After centrifugation and high gravity separation, rare earth concentrates with a grade of ceria fluorosilica of 80-93% can be obtained, and the recovery rate of rare earths in the concentrates can reach 85-90%. The main phases in the tailings are calcium fluoride and rare earth-containing barium fluorine phlogopite, which can replace part of fluorite for recovery of calcium fluoride, and the tailings can be directly used as raw materials for wet extraction of Sc203 and Eu203. The invention has the advantages of utilizing supergravity to realize directional enrichment of fine and dispersed ceric fluorosilica in rare earth slag, improving the yield and quality of product Ce2O3, and recovering fluorite, Sc2O3 and Eu2O3 in tailings at the same time. It not only solves the environmental load problem of rare earth slag, but also realizes the comprehensive utilization of 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 iron content, high rare earth content and high fluorine content) in the main and east 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 ...

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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