A kind of beneficiation method of rare earth ore

Abstract

The present invention provides a method for beneficiation of rare earth ore. The flotation method is used to separate fine-grained rare earth ore with a particle size of -30 μm+10 μm. Firstly, an aqueous solution containing 300-600g / t of the first collector is prepared, and the fine-grained rare earth ore is slurried with this aqueous solution; then PH adjuster, inhibitor and 500-800g / t of the second collector are added in sequence agent, stir evenly; finally, flotation is carried out to obtain concentrate and tailings. The present invention selects an aqueous solution containing a certain amount of the first collector for sizing, and can initially selectively adsorb useful minerals during sizing; after sizing, the added second collector is selected from self-made trimethylsilyl acetate The hydroxamic acid has good selectivity to rare earth metals, and the preparation method is simple, and the recovery rate of the concentrate obtained by the final flotation is as high as 90% or more, and the grade is as high as 65% or more.

Description

technical field [0001] The invention belongs to the field of mineral processing technology, in particular to a rare earth mineral processing method. Background technique [0002] Rare earth ore can be divided into mineral type and ion type according to the deposit. my country is rich in mineral-type rare earth ore resources, and the typical ones are Baiyun Obo Iron Rare Earth Niobium Mine, Sichuan Mianning Rare Earth Mine and Shandong Weishan Rare Earth Mine. Gangue minerals such as quartz, fluorspar, feldspar, barite, calcite and silicate are symbiotic, which requires that rare earth ores must be sorted before they can be used. The rare earth minerals in the rare earth deposits are generally densely symbiotic with their associated minerals, and the embedded particle size is fine. To dissociate the rare earth mineral monomers, the ore needs to be finely ground. The grinding fineness is generally 80-90% of the -200 mesh content. Due to the brittleness of rare earth minerals ...

AI Technical Summary

Problems solved by technology

In addition, the currently widely used H2O5 collector has high production costs, a small amount of toxicity, and a large amount of use, which is likely to cause environmental pollution

However, the inhibitors of rare earth beneficiation have poor selectivity for the gangue suppression in fine-grained rare earth minerals, so it is difficult to obtain high-grade rare earth concentrates, such as the Zhushan rare earth mine in Hubei. use

[0005] Hydroxamic acid is a kind of highly selective collector, which can be used in the flotation of various oxidized ores. At present, hydroxamic acid in the field of mineral flotation is mainly due to its poor selectivity and collection and high reagent cost. , and the disadvantages of high drug toxicity limit the development and utilization of rare earth mines to a certain extent

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