Abstract
Polycrystalline silicon was extracted from rice husk by thermal decomposition and aluminothermic methods. Rice husk was thermally decomposed under various heat treatments and acid purifications. High purity silica of 99.81% was obtained by subsequent rice husk washing, pressure cooking in mixed chloride acid peroxide solution, and burning at 500oC for one hour. Aluminothermic reduction of silica was conducted at various calcination temperatures. It is found that 78.6% of silica was converted to silicon for calcination temperature of 800oC. Leaching the reduction product with strong hydrochloric and hydrofluoric acids produced silicon polycrystalline with a purity of 99.91%.
Highlights
At present, Indonesia is the third-largest producer of paddy rice in the world, sharing about 74.2 million metric tonnes or 9.78% of world total rice production in 2017 (FAO, 2017)
High purity silica powder can be extracted from rice husk by various routes of heat and chemical treatments
We report the preparation of polycrystalline silicon from rice husk through thermal decomposition of husk to produce silica powder, and the aluminothermic reduction process of silica powder by using 5 wt.% excess of aluminum at moderate temperatures and leaching the reduction product in strong chloric and fluoric acid
Summary
Indonesia is the third-largest producer of paddy rice in the world, sharing about 74.2 million metric tonnes or 9.78% of world total rice production in 2017 (FAO, 2017). Et al, (2011) and Larbi, et al, (2013) reduced silica from rice husk and Preparation of Polycrystalline Silicon from Rice Husk silica fume, respectively, by magnesium excess to produce maximum yield Si in the final reduction product.
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