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EXTRACTION OF ALUMINA FROM SELECTED NIGERIAN KAOLIN FOR INDUSTRIAL APPLICATIONS
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The extraction of alumina from selected Nigerian kaolin was investigated to assess its viability as a raw material for industrial applications. Kaolin samples from four locations Okpella, Afowa (white and black), and Ado Ekiti, were analyzed for their chemical composition and subjected to calcination and acid-leaching processes. The clays were calcined at 900°C to produce metakaolin, a precursor favorable for alumina extraction. Various concentrations of nitric acid (HNO₃) and hydrochloric acid (HCl) were employed to leach alumina from the calcined samples. The leached alumina was precipitated as aluminum hydroxide and subsequently calcined at 900°C to yield alumina (Al₂O₃). The process efficiency was evaluated through XRF analysis, revealing recovery rates up to 92% under optimal conditions. This study demonstrates the potential of Nigerian kaolin as a sustainable source of alumina for industrial applications and highlights the influence of acid concentration and calcination on extraction efficiency.
Universitatea Gheorghe Asachi din Iasi
Title: EXTRACTION OF ALUMINA FROM SELECTED NIGERIAN KAOLIN FOR INDUSTRIAL APPLICATIONS
Description:
The extraction of alumina from selected Nigerian kaolin was investigated to assess its viability as a raw material for industrial applications.
Kaolin samples from four locations Okpella, Afowa (white and black), and Ado Ekiti, were analyzed for their chemical composition and subjected to calcination and acid-leaching processes.
The clays were calcined at 900°C to produce metakaolin, a precursor favorable for alumina extraction.
Various concentrations of nitric acid (HNO₃) and hydrochloric acid (HCl) were employed to leach alumina from the calcined samples.
The leached alumina was precipitated as aluminum hydroxide and subsequently calcined at 900°C to yield alumina (Al₂O₃).
The process efficiency was evaluated through XRF analysis, revealing recovery rates up to 92% under optimal conditions.
This study demonstrates the potential of Nigerian kaolin as a sustainable source of alumina for industrial applications and highlights the influence of acid concentration and calcination on extraction efficiency.
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