Abstract
The low efficiency of the separation of rare earth metals by extraction on one stage requires the combination of a large number of mixer-settlers in a cascade. The problem of increasing the rare earth elements separation factor is extremely urgent. One of the perspective methods is the nonequilibrium nonstationary process. In this work, it is offered to use the principle of a nonstationary extraction in the separation process of the Nd/Pr pair from chloride medium by the extractant based onP507. The results which have been received by an experimental setup allowing the monitoring of the influence of a cyclic change of physical-chemical parameters on extraction in the online modeare discussed. A comparison of two ways of implementation of extraction in the nonstationary mode is carried out. The apparent values of physical-chemical parameters (ΔG, ΔH, ΔS) in the temperatures range 15-65 °C are calculated from the data of joint extraction of Nd and Pr.
Highlights
The cascades for obtaining the individual rare earth metals can consolidate up to 150 apparats
The separation factory has a high capital cost. It limits the creation of new separation capacities. [2] presented the specification of technologies of producing of purity rare earth metals from the natural and technogenic raw materials, which are applied in China
The values of the extraction constant (KEx) in the range of 15 – 60 °C were calculated from experimental data for joint extraction of Nd and Pr with the extractant based on P507 from chloride media
Summary
The cascades for obtaining the individual rare earth metals can consolidate up to 150 apparats. To obtain individual metals of the purity, required by modern industry from a natural mixture containing n components, 2n-1 cascades are needed, which, on average, combine the same numbers of stages [1]. The separation factory has a high capital cost. It limits the creation of new separation capacities. [2] presented the specification of technologies of producing of purity rare earth metals from the natural and technogenic raw materials, which are applied in China. Achievements of the global rare metal industry are presented in the monograph of [3]. In the work of [4], the state and prospects of recovery and development of the REM industry in Russia are studied
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