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All Journal Budapest International Research in Exact Sciences (BirEx Journal)
Rija, Rabearisoa Solotiana
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Physics Transportation

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Mineralogical determination of Bemololo, Miandrivazo and Analavory clays by X-ray diffraction for applications Elidon, Ramahandry Jean; Baholy, Robijaona Rahelivololoniaina; Andrianirina, Randriantsimbazafy; Wega, Razafindramanga Athou; Rokiman, Letsara; Rija, Rabearisoa Solotiana; Ngbolua, Koto-te-Nyiwa; Aurélien, Mandimbiiharison
Budapest International Research in Exact Sciences (BirEx) Journal Vol 6, No 3 (2024): Budapest International Research in Exact Sciences, July
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v6i3.7974

Abstract

After characterizing the clay minerals from the Bemololo (BMLL), Miandrivazo (MNDV), and Analavory (ANLV) deposits using X-ray diffraction (XRD), dye absorption experiments and photochemical screening analyses were conducted to determine the potential applications for each clay. XRD analysis revealed that the Bemololo deposit comprises the following mineral compositions: BMLL 001 is rich in muscovite; BMLL 002 contains a mixture of vermiculite, sepiolite, and amphibole; BMLL 003 is composed of kaolinite and chlorite; and BMLL 004 is predominantly kaolinite. For the Miandrivazo deposit, MNDV 001 is a mixture of kaolinite, muscovite, and chlorite; MNDV 002 contains chlorite and muscovite; and MNDV 003 comprises kaolinite and muscovite. The Analavory deposit features ANLV 001, which contains aragonite and calcite, and ANLV 002, identified as vermiculite clay. Dye absorption experiments indicated that BMLL 001, BMLL 002, and BMLL 003 have potential applications in water treatment, particularly in the removal of unwanted dyes or ions. Additionally, photochemical screening revealed the presence of deoxyose in BMLL 004, while BMLL 002, ANLV 002, and ANLV 001 were found to contain tannins.
Optimizing Sulfuric Acid 98% Leaching: Lithium Recovery from Madagascar Spodumene Rija, Rabearisoa Solotiana; Baholy, Robijaona Rahelivololoniaina
Budapest International Research in Exact Sciences (BirEx) Journal Vol 7, No 4 (2025): Budapest International Research in Exact Sciences, October
Publisher : Budapest International Research and Critics University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33258/birex.v7i4.8114

Abstract

A comprehensive study of lithium extraction from Vakinankaratra, Madagascar spodumene through sulfuric acid digestion and subsequent aqueous leaching is presented. The process initiates with calcination, a pretreatment designed to induce the alpha-to-beta phase transformation of spodumene, resulting in decreased density, increased friability, and enhanced chemical reactivity. Characterization of the ore, employing X-ray fluorescence (XRF) and atomic absorption spectroscopy (AAS), revealed a mineralogical composition dominated by oxides of lithium, silicon, aluminum, potassium, and fluorine, confirming the presence of economically relevant lithium concentrations. The investigation explored the influence of reaction time, varying from one to three hours, at elevated digestion temperatures. Rigorous optimization of experimental parameters was conducted, yielding significant insights into the leaching process. The findings demonstrate a strong correlation between lithium extraction efficiency and the ore-to-acid ratio, temperature, and, most notably, reaction time. Under optimized conditions, specifically a reaction temperature of 250°C and a duration of three hours, a 92% lithium extraction rate was achieved for both calcined spodumene and lepidolite samples. This study provides a detailed understanding of the critical parameters governing lithium extraction from Malagasy spodumene, contributing to the development of efficient and industrially applicable extraction methodologies.
Co-Authors Andrianirina, Randriantsimbazafy Aurelien, Mandimbiiharison Baholy, Robijaona Rahelivololoniaina Elidon, Ramahandry Jean Ngbolua, Koto-te-Nyiwa Rokiman, Letsara Wega, Razafindramanga Athou