http://kims-imio.com/index.php/main АО "Институт металлургии и обогащения", Satbayev University en-US Kompleksnoe Ispolzovanie Mineralnogo Syra = Complex use of mineral resources 2224-5243 http://kims-imio.com/index.php/main/article/view/633 <p>The article explores the prospects for the development of Kazakhstan's aluminum industry, with a focus on the application of additive manufacturing technologies for the synthesis of chromium-alloyed composite aluminum alloys in the Al-Fe-Si system. A comprehensive metallographic and thermodynamic analysis of the phase composition of alloys synthesized by consumable electrode surfacing was carried out. The use of Thermo-Calc software enabled the construction of polythermal sections and the assessment of the influence of alloying element concentrations on the formation of intermetallic phases, including Al₁₃Fe₄ (θ-phase) and Al₈Fe₂Si. The optimal chromium alloying conditions were substantiated, ensuring reduced brittleness and improved mechanical properties through the formation of a fine-grained structure, stabilization of the phase composition, and removal of large primary dendrites. The obtained results confirm the potential of chromium alloying as an effective approach in developing intermetallic aluminum alloys with the desired properties. The study's results contribute to the advancement of technologies for producing aluminum alloys with enhanced performance characteristics, thereby expanding the potential for industrial applications of additive manufacturing methods.</p> V.A. Andreyachshenko A.R. Toleuova Copyright (c) 2025 V.A. Andreyachshenko, A.R. Toleuova https://creativecommons.org/licenses/by/4.0 2025-12-11 2025-12-11 342 3 5 15 10.31643/2027/6445.25 http://kims-imio.com/index.php/main/article/view/650 <p>Against the backdrop of depleted rich deposits and the increasing proportion of refractory gold-bearing ores, improving their processing methods has become an urgent task. This work presents the results of a comprehensive study of gold-bearing ores from the Pakrut deposit, located in Central Tajikistan's Zeravshan–Gissar zone. Mineralogical analysis established that the principal gold carriers are pyrite and arsenopyrite, with the metal predominantly localized as fine inclusions and fracture-related accumulations. A notable fraction of gold occurs as free particles (17.03%); however, the dominant share is fracture-bound (62.41%) and is predominantly associated with arsenopyrite. This distribution explains the limited efficiency of single-stage treatment and substantiates the need for combined unlocking and recovery routes. Physicochemical studies confirmed the ores' refractory nature, attributed to the fine dissemination of gold within the sulfide matrix, combined with high hardness and abrasiveness. At the laboratory scale, various beneficiation flowsheets were tested, including direct cyanidation; flotation combined with additional leaching of tailings; and variants incorporating gravity separation. A comparative analysis showed that the highest gold recovery rate (92.23%) was achieved by the flowsheet involving cyanidation, followed by tailings leaching and flotation. Although direct cyanidation also demonstrated a high recovery rate (90.05%), it was less effective. The flotation–cyanidation and gravity–flotation schemes yielded comparatively lower performance. The obtained data confirm the effectiveness of an integrated approach to processing the refractory ores from the Pakrut deposit. Optimizing the beneficiation flowsheet enables a significant increase in precious metal recovery, reduces technological losses, and minimizes environmental risks associated with the accumulation of arsenic-bearing waste.</p> Kh.I. Kholov Sh.R. Juraqulov Sh.R. Samihzoda H.A. Mahmudov Copyright (c) 2025 Kh.I. Kholov, Sh.R. Juraqulov, Sh.R. Samihzoda, H.A. Mahmudov https://creativecommons.org/licenses/by/4.0 2026-01-05 2026-01-05 342 3 16 26 10.31643/2027/6445.26