Metals, Journal Year: 2025, Volume and Issue: 15(1), P. 89 - 89

Published: Jan. 18, 2025

The aim of this research is to investigate the phase composition and structural peculiarities complex metamorphic manganese ores from Central Kazakhstan before after sintering in temperature range 600–1200 °C an air atmosphere. X-ray diffraction, fluorescence, scanning electron microscopy, optical microscopy were used analyze changes elemental composition. In their initial state, according XRF analysis, Bogach ore was manganese-rich, with a content 60.77 wt.%, while Zhaksy contained (44.88 wt.%), silicon (20.85 iron (6.14 wt.%) as its main components. samples, increased 60.77% 65.7% rose 1100 °C, hausmannite (Mn3O4) emerged dominant phase, comprising 95.77% crystalline component at 1200 °C. Conversely, samples displayed sharp increase braunite-phase (Mn7O12Si) content, reaching 83.81% alongside significant quartz amorphization. degree crystallinity peaked 56.2% 900 but declined higher temperatures due amorphous formation. A surface morphology analysis revealed transformation dense, non-uniform particles into porous, granular structures pronounced recrystallization increased. resulted elongated, needle-like formations, tetragonal crystals dominated, indicating grain growth recrystallization. For led porous interconnected grains microvoids, reflecting enhanced braunite crystallization These findings provide quantitative insights optimizing oxide phases for industrial applications, such catalysts pigments, emphasize impact thermal treatment on stability properties. This contributes development efficient processing technologies medium-grade ores, aligning Kazakhstan’s strategic goals sustainable resource utilization.

Language: Английский