Browsing by Author "Jathanna, H.M."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Iron Ore Characterization Techniques in Mineral Processing
    (Springer, 2024) Poojari, M.; Vardhan, H.; Jathanna, H.M.
    While iron is a pivotal metal that is exploited commercially, its extraction from ores, subsequent processing and purification follows a series of steps, and material characterization in terms of physical, chemical and mineralogical features and behavior is imperative at each stage. Some characterization tests rely solely on physical measurements, while others are based on optical and chemical data. Thus, employing these techniques is critical for gaining a complete understanding of ore characteristics such as physical, chemical, textural, mineralogical, granulometric, etc., in order to forecast its behavior during processing operations, and as a result, to optimize the process. Consequently, this review highlights some of the primary characterization tests such as SEM (Scanning Electron Microscopy), XRD (X-ray Diffraction), and FTIR (Fourier Transform Infrared spectroscopy) used in iron ore processing and their significance in analyzing various properties such as elemental composition, porosity, mineral association, and liberation, among others, while also introducing additional and emerging techniques used in iron ore mineralogical assays and processing operations. Characterization tests are presented used not just for high-grade iron ores, but also for low-grade discard materials such as fines and tailings. While optical microscopy and SEM aid in micro-morphological examinations, and XRD, FTIR, and other techniques aid in detailed chemical investigations, TGA and BET assist in physical characterization. A combination of these techniques may be deemed ideal for gaining a thorough understanding of ore characteristics as well as ore processing. © The Institution of Engineers (India) 2023.
  • No Thumbnail Available
    Item
    Zeta Potential in Estimating the Dispersive Behavior of Microwave and Ultrasonic Pretreated Indian Lean-Grade Iron Ore from Karnataka Region
    (Springer, 2025) Poojari, M.; Vardhan, H.; Hanumanthappa, H.; Jathanna, H.M.; Reddy, D.G.
    This paper discusses zeta potential as an indicator of enhanced stability and in turn quality of lean-grade iron ore from Karnataka following physical pretreatments such as microwave (MW) and ultrasonic (US). Throughout the study, a set of 16 samples, designated S1–S16, was investigated, with S1 representing the untreated sample, S2–S4, US-treated samples, S5–S7, MW-treated samples, and S8–S16 representing samples that received MW and US combined pretreatment at different time intervals. The increased ore stability was confirmed by assessing multiple parameters such as electrophoretic mobility, optical density (OD), conductivity, and transmittance. Samples S12, S13, and S16 had higher conductivity, while S5, S7–S9, and S15–S16 had higher transmittance, proving that they had better inter-particle repulsions and thus stronger stability. Ore quality improvement was further verified using x-ray diffraction (XRD), which revealed gangue reduction in the aforementioned samples compared to ore that had other treatments or was left untreated. These findings show the importance of MW and US pretreatments in increasing ore quality and its stability in subsequent processing steps. © The Minerals, Metals & Materials Society 2025.