Title: Potential-pH Analysis of Selective Separation Conditions of Dysprosium, Molybdenum, and Tellurium Metals from Technogenic Solutions
Authors: Kholikulov D.B., Khojiev Sh.T., Khudoymuratov Sh.J., Karshiboev Sh.B., Mutalibkhonov S.S.
Volume: 9
Issue: 4
Pages: 216-221
Publication Date: 2025/04/28
Abstract:
This study evaluates the thermodynamic feasibility of selectively extracting rare metals such as dysprosium (Dy), molybdenum (Mo), and tellurium (Te) from technogenic solutions formed during the scrubbing of process gases at the Almalyk MMC Copper Smelting Plant. Potential-pH (E-pH) diagrams for each metal were generated using the FactSage software to identify the stable phases. The analyses demonstrated that Dy can be precipitated as Dy?O? under alkaline conditions (pH > 7.5), Te as TeO? under oxidizing-neutral conditions (pH 5-8, E = 0.5-0.7 V), and Mo as MoO? in the pH range of 5-9 (E = 0.0-0.5 V). The characteristics of the precipitated phases and the influence of competing ions were examined to determine optimal conditions for selective separation. In particular, it was shown that the selectivity of Dy can be enhanced using masking agents (e.g., EDTA, citrate), Te can be recovered in the initial stage by controlling the oxidation potential, and Mo can be precipitated selectively against the background of other metals by exploiting phase distinctions. The findings of this research contribute significantly to the efficient recovery of economically valuable components from technogenic solutions and to the development of waste-free technologies.