Vol 6, No 7 (2015) > Metalurgy and Material Engineering >

Optimization of Silicon Extraction from Tanjung Tiram Asahan Natural Sand through Magnesiothermic Reduction

Andriayani Andriayani, Saur L. Raja, Herlince Sihotang, Nofrijon Sofyan

 

Abstract:

We carried out silicon extraction from the
natural resources of Tanjung Tiram Asahan, Batu Bara Regency, North Sumatra
through variation of heating temperatures and magnesiothermic reduction. Prior
to the extraction, the sand from the natural resource was refined until the
solid white silica powder was separated. The reaction conditions were performed
at various heating temperatures in a furnace, as follows: at 750 (2 hours), 800
(3 hours), 850 (3 hours), 900 (3 hours), and 950 (3 hours). Optimization of the
extraction reaction conditions was then performed using magnesiothermic
reduction at several silica and magnesium ratios, i.e. 1:1.125, 1:1.50, 1:1.75,
1:1.20, and 1:1.25. The refined silica, together with all of the silicon
products from the extraction, was characterized using XRD and analyzed. The morphology
of the reaction product was characterized using an electron microscope. The
results showed that changes to the silicon products after extraction varied,
depending on temperature. Optimization of silicon extraction from silica was
obtained at 800°C for 3 hours, with a silica and magnesium ratio of
1:1.75.

Keywords: Magnesiothermic reduction; Natural Sand; RIR Method; Silica; Silicon

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