Abstract
Considering the ever-increasing role of rare-earth elements (REE) in the modern hi-tech field, their effective use has tremendous significance, although the production process is inevitably linked to the large volumes of industrial ammonia effluents and heavy metal wastes. In the process of metallurgical separation of metals, the emission of large volumes of noxious gases and radioactive substances is inevitable. Lean technogenic raw material processing is sensible under the condition of the development of non-waste technology. The lack of competent regulations governing the disposal of waste containing REE has an impact on adjacent territories, accumulating in water bodies and, as a result, in the human body. Such an impact cannot pass without a trace, however, the ambiguity of opinions in the scientific community regarding the toxic effects of REE on living organisms determines the relevance of a more detailed study of this issue. The study of ytterbium ions removal from aqueous standard test solutions by the adsorptive bubble method—ion flotation—was conducted. The experiments showed that by using the ion flotation method, the maximum removal of ytterbium (III) was achieved at pH = 8.30. It was shown that ytterbium (+3) distribution coefficients as a function of aqueous phase pH value in the process of ion flotation with sodium dodecyl sulphate were derived. The comparison of values of removal pH with those of hydrate formation pH allowed to conclude that ytterbium floate as basic dihydroxoytterbium dodecyl sulphate Yb(OH)2(C12H25OSO3).
Highlights
The development of rare-earth elements (REE) mineral deposits provokes the leakage of pollutants that pose a danger to human life and health and severely damages the environment
Among the relevant areas of detailed study of the effect of REE on living organisms, the following can be distinguished: the widespread and active use of REE in industry necessitates the study of their physicochemical properties in order to prevent them from entering the environment and living organisms with disposal of hazardous waste containing REE [2,3,4,5]
This paper studies the possibility of lanthanide ion removal from diluted aqueous solutions by the ion flotation method using SDS as the collector agent [12]
Summary
The development of REE mineral deposits provokes the leakage of pollutants that pose a danger to human life and health and severely damages the environment. To conduct ecological and geochemical zoning and allocation of territories with the presence of anomalies (the presence of REE), Tomsk Polytechnic University conducted studies of the ratio of lanthanum and cerium. The choice of such a material was due to the fact that lanthanum and cerium are light REE, and it is they that accumulate in organ tissues and blood plasma, while heavy REE are concentrated mainly in the skeleton. A special feature of Russian raw material sources is the low REE content and complex chemical and mineralogical composition. According to data [21], the ion flotation method was used for removal of rare-earth and radioactive metal cations from residential wastewaters.
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