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[REPM2025_P2-23_Kirillov.pdf](https://mdr.nims.go.jp/filesets/ce57f247-6a38-4f18-9e57-96b648fc5b5f/download)

## Creator

Evgenii Kirillov, Vladimir Rychkov

## Rights

[Creative Commons BY Attribution 4.0 International](https://creativecommons.org/licenses/by/4.0/)

## Other metadata

[Uranium in-situ leaching liquors are a potential source of “magnetic” REE](https://mdr.nims.go.jp/datasets/d63877bd-f6d9-4be8-a8bc-bedc1c8829fb)

## Fulltext

Презентация PowerPointUranium in-situ leaching liquors are a potential source of“magnetic” REEEvgenii Kirillov, Vladimir RychkovUrFU has developed a pilot plant for the extraction of REEfrom uranium IL liquors. During the operation of the plant, itwas possible to obtain REE concentrates in a stable mode with apurity of at least 99%. In this case, the content of the medium-heavy REE group in the final concentrate decreases to 15-20%due to the use of cation exchange resin for primaryconcentration, which mainly extracts the light REE group (fig.2a)Studies were also conducted on concentrating the medium-heavy REE group from uranium IL liquors using impregnatedsorbents containing monosubstituted diglycolamides as anactive phase. When passing 100 specific volumes of uraniumPV solution through a column, the degree of extraction of heavyREE (Ho-Lu fraction) was more than 90%. The use of thissorbent allows selective extraction of REE from highlymineralized liquors containing significant amounts of iron andaluminum ions/Fig. 1. Comparison of the ratio of light and heavy REE in ore sourcesThe main reasons for the structural imbalance are the limited andlocalized deposits of yttrium group REE in China and, in thisregard, the global increase in the processing volumes ofbastnaesite, loparite, monazite, which results in theoverproduction of light REE. The transition to the use of rawREE sources that best satisfy the current and planned marketdemands in terms of composition is the most justified solution tothe problem of the structural imbalance of REE production bothin the world and in Russia.One of the rich Russian sources of REE containing the aboveelements (the content of the medium-heavy REE group is up to30%) are uranium in-situ leaching (IL) liquors. The advantage ofthese objects is that the REE in them are already in the extractedstate.Fe AlLREEMREEHREE00,510 50 100 150С/С0VolumeSubsequent washing of the rich column with sulfuric acidliquors of different concentrations made it possible to obtainPr-Nd, Sm-Eu-Gd, Y-Tb-Dy, Ho-Lu concentrates directly atthe extraction site.Based on the analysis of the output curves of REE sorptionfrom uranium IL liquors, the degree of concentration of themedium-heavy group can be estimated at 150-300 times (fig.2b)Fe AlLREE MREEHREE00,510 50 100 150С/С0VolumeYLaCePrNdM-H REEAlFe010020030040050060001020304050600 2 4 6 8СFe, Al, mg. L-1С, mg. L-1VolumeFig. 2. (a) Cation resin sorption; (b) Impregnated resin sorptionFig. 3. Chromatographic elution of REE from an experimental resinThe joint sequential use of sorption units containing cationexchange resin and a sorbent with active acidic diglycolamidewill allow the enterprise to respond flexibly to the demand forREE.IL liquorThe developedschemeComplexschemeScheme withno demandfor LREEREE concentrateM-H REE concentrate REE concentrateM-H REE concentrateFig. 4. Option for using the obtained technological solutionsElement Concentration, mg.L-1РЗЭ+Y 30÷50Sc 0.3÷0.5U 1÷5Th 5÷20Fe 800÷1300Al 1000÷1500Ca 300÷500Table 1 - Composition of uranium in-situ leaching (ISL) solutions