METHOD OF EXTRACTING A RARE-EARTH CONCENTRATE Russian patent published in 2020 - IPC C22B59/00 C01F17/10 

FIELD: technological processes.

SUBSTANCE: invention relates to a method of extracting a rare-earth concentrate from a solution obtained during processing of rare-earth material and can be used in chemical and metallurgical industry. Method includes stepwise neutralization of a solution containing sodium nitrate or chloride, rare-earth elements and impurity components of calcium, aluminum, iron, titanium and thorium. At the first stage solution neutralization is carried out with an alloy based on nitrate or sodium chloride containing 2.5–3.0 wt% sodium carbonate or hydroxide, to provide pH 4.40–4.45 with deposition and separation of thorium-containing concentrate, and at second step by said alloy containing 15–30 wt % of sodium carbonate or hydroxide to pH 7.35–7.50 with sedimentation and separation of rare-earth concentrate.

EFFECT: method enables to efficiently extract a rare-earth concentrate from a solution obtained during processing of rare-earth raw materials, with provision of high to 98.64 % recovery of REE into a non-radioactive concentrate.

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