About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
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Characterization of Minerals, Metals and Materials 2022
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Presentation Title |
Charactesrization of Nano-crystalline Metallurgical-grade Silicon Prepared from Rice Husk Ash |
Author(s) |
Benedict O. Ayomanor, Cookey Iyen, Ifeoma Sandra Iyen, Vitalis Mbah, Daniel Ikechukwu Anyaogu, Daniel Nanribet Dawuk, Sunday Oricha Anikoh, Matthew Omonokhua, Suleiman Duwa Ndiriza |
On-Site Speaker (Planned) |
Benedict O. Ayomanor |
Abstract Scope |
Rice husk (RH), an agricultural waste product, contains a large proportion of silicate minerals, making it a potential source of low-cost metallurgical grade silicon (MG-Si) suitable as a solar-grade silicon material. In this work, silica of between 95.24% and 98.03% has been prepared from RH ash (annealed at 700oC, 800oC, 900oC and 1000oC for 6 hours). Furthermore, the silica value was boosted by use of hydrometallurgical purification process. The improved purification processes yielded between 99.18% and 99.51% of silica. The metallic trace impurities were significantly reduced beyond detection of the XRF after the final processing step. Metallothermic reduction of pulverized Mg and SiO2 mixture at ratio 1:1 gram was post hydrometallurgical purified further. XRF showed silicon powder with purity > 98% and the XRD showed RHA transformation from amorphous to crystalline material. TEM investigation shows that derived silicon consist of agglomerate polycrystalline materials with grain sizes of 20-67.08nm |
Proceedings Inclusion? |
Planned: |