|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials 2021
||Characterization of Nano-crystalline Metallurgical-Grade Silicon Prepared from Rice Husk Ash (RHA)
||Benedict O. Ayomanor, Cookey Iyen, Vitalis Mbah, Daniel Ikechukwu Anyaogu, DANIEL NANRIBET DAWUK, SULEIMAN NDIRIZA, Sunday Oricha Anikoh, MATTHEW OMONOKHUA
|On-Site Speaker (Planned)
||Benedict O. Ayomanor
In this work, Rice Husk Ash (RHA) silica of between 95.24% and 98.03% has been prepared from Rice Husk, an agricultural waste product (ashed 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 SiO2 and Mg mixture at ratio 1:1 gram was post hydrometallurgical purified to further eliminate all soluble impurity. XRF showed low-cost metallurgical grade silicon powder with purity > 98% and the XRD showed that RHA transformation from amorphous to crystalline material depends on temperature and time. TEM investigation shows that derived silicon consist of agglomerate polycrystalline materials with grain sizes of 20-67.08nm.