Browsing by Author "Berhanu Adugna"

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    Investigating the Potential of the Magnetic Separation Method as an Auxiliary Technique for Upgrading Lithium Ore Mineral from Kenticha Pegmatite Deposit in Guji, Southern Ethiopia
    (Addis Ababa University, 2023-06) Berhanu Adugna; Sisay Degu(PhD)
    Lithium has become a critical mineral in the energy industry, with significant increases in usage due to the global shift towards green energy alternatives over the past decade. The Kenticha pegmatite deposit in Ethiopia is known to have a feasible content of Li2O, making it a potentially valuable resource for lithium extraction. However, the beneficiation of lithium-bearing minerals is a crucial stage in upgrading the lithium oxide content of the ore and enhancing its economic value. The presence of gangue minerals such as microcline, albite, quartz, muscovite, and iron silicate minerals can complicate the process. Frantz magnetic separators were employed to conduct magnetic separation tests. Samples were collected from four different locations within an upper lithium-rich pegmatite deposit and subjected to analysis, revealing varying percentages of lithium oxide and iron oxide. The effectiveness of a Frantz magnetic separator was examined using feed size fraction and intensity as independent variables, with various combinations of factors tested. The resulting data was analyzed using AAS and XRD techniques to gain valuable information about the separation process and lithium mineral liberation. The separation effectiveness was evaluated based on the results, which indicated that high-intensity magnetic experiments with fine feed size fractions achieved better recovery of lithium oxide and less iron-bearing minerals. The potential for using the magnetic separator as part of a larger processing plant was also discussed, with comparisons magnetic separation method to other conventional lithium processing methods that employed magnetic separation. Finally, potential types of magnetic separators were suggested for the LCT Kenticha pegmatite deposit.
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    Modeling Inflation Dynamics in Ethiopia
    (A.A.U, 2008-07) Berhanu Adugna; Ageba Gebrhiwot
    This study examines the dynamics of the inflation in the long and short term using econometric " techniques of co integration tests and error correction modeling for the period 1992:4 to 2007:2. The empirical results show that the price index, real gross domestic product, broad money, official exchange rate and world price are co integrated. They also indicate that in the long term the world price index and real gross domestic product are the strongest in affecting inflation in Ethiopia. On the other hand, the money Supply is the strongest in pushing inflation up in the I short term. The long term effect of official exchange rate is insignificant while it has the next I strong effect in the short term. The important implication of the study is, hence; first, controlling the money supply and exch ange rate to control inflation in the short term and, second, increasing production and keeping the economy from possible world price shocks are good instruments in the long term attempt of controlling inflation.