X-ray diffraction analysis of silicon prepared from rice husk ash

Ikram, N.; Akhter, Muhammad

doi:10.1007/bf01111891

Cited by 50 publications

(22 citation statements)

References 5 publications

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“…This result is in line with the diffraction pattern by X-ray diffraction in Figure 4 where there are no dominant peaks. This XRD pattern has similiar to study of Ikram and Akhter [27] which stated a typical XRD pattern of amorphous silicon dioxide produced from rice husk combustion. Maximum peaks of HCl 1%, 3%, and 5% are in 2θ = 21.91 °, 21.65 °, and 21.77 °, respectively, with the same hkl plane (101).…”

Section: Methodssupporting

confidence: 81%

Biosilica Properties from Rice Husk using Various HCl Concentrations and Frequency Sources

et al. 2020

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Section: Methodssupporting

confidence: 81%

Biosilica Properties from Rice Husk using Various HCl Concentrations and Frequency Sources

et al. 2020

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“…Therefore, in this case melting of the remaining magnesium is not followed by an exothermic reaction. 10 Vapour pressure of magnesium required for reduction of SiO 2 (solid line) and in equilibrium with pure Mg (dashed line) Based on this reaction mechanism, it is suggested that smaller RHA particles, higher operating temperature and longer dwell time (or slower cooling) will result in higher yield of Si. Operating under these conditions will also decrease the Mg consumption.…”

Section: Mechanism Of Reduction Reactionmentioning

confidence: 98%

“…The magnesium reduction of RHA to produce silicon has also been investigated by Banerjee et al 9 and by Ikram and Akhter. 10 Banerjee et al reduced acid leached RHA by intimately mixing the ash with magnesium powder and firing the powdered mixture in a sealed graphite crucible in a muffle furnace. Following a similar approach but with 4 N magnesium purity, Ikram and Akhter reported reduction of RHA at a temperature of 620uC to yield silicon of 99?95% purity after acid leaching purification steps.…”

Section: Introductionmentioning

confidence: 99%

Reduction behaviour of rice husk ash for preparation of high purity silicon

Larbi

Barati

McLean

2011

Canadian Metallurgical Quarterly

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The reduction of rice husk ash (RHA) silica for the preparation of high purity silicon was studied using magnesium as the reducing agent. Composite magnesium-RHA pellets with magnesium content varying 0-25 wt-% in excess of stoichiometry requirement were made and heated in the temperature range of 600-900uC under flowing argon. It was found through differential thermal analysis and temperature profile recording that the reaction of RHA silica with magnesium was triggered at y575uC. Quantitative X-ray diffraction analyses of the reduction products showed that both initial magnesium content of the pellets and the reduction dwell temperature had a significant influence on the yield of silicon. In this study, a charge with 5 wt-% magnesium in excess of the stoichiometric amount at a reduction temperature of 900uC gave a maximum silicon yield.On a é tudié la ré duction de la silice de cendre de balle de riz (RHA) dans la pré paration de silicium à haut degré de pureté en utilisant du magné sium comme agent de ré duction. On a fabriqué des boulettes composites de magné sium-RHA avec une teneur en magné sium variant de 0 à 25% en poids en excè s des besoins de la stoechiomé trie et on les a chauffé es dans la gamme de tempé rature de 600 à 900uC sous un flux d'argon. On a trouvé , par analyse thermique diffé rentielle (DTA) et par enregistrement du profil de tempé rature, que la ré action de la silice de RHA avec le magné sium é tait dé clenché e à environ 575uC. Des analyses quantitatives par XRD des produits de ré duction ont montré que tant la teneur initiale en magné sium des boulettes que la tempé rature de maintien de la ré duction avaient une influence importante sur le rendement en silicium. Dans cette é tude, une charge avec 5% en poids d'excè s de magné sium sur la quantité stoechiomé trique à la tempé rature de ré duction de 900uC donnait un rendement maximal de silicium.

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“…Black ash containing silica and significant amount of impurities are the product obtained from rice husk firing. It has been reported that the purity of silica is highly affected by chemical treatment [16][17] rather than thermal treatment [18]. Therefore in this work, the rice husk was chemically treated as to produce silica with high purity.…”

mentioning

confidence: 99%

Effect of Rice Husk on Fired Ceramic Shell Strength

Harun

Kamarudin

Taib

2013

AMR

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In recent years, ceramic shell mould for investment casting process is often associated to defects due to its brittle properties. The defects would originate from cracking mechanism yielded from the ceramic brittleness. In this work, the improvement of ceramic shell mould by reinforcement technique was studied and analyzed. Rice husk consisting high percentage of silica content with the ability to withstand high temperature during casting process was studied as the reinforcing component as to impede cracking mechanism. Higher Modulus of Rupture (MOR) value of ceramic shell reinforced by rice husk fiber as compared to the non-reinforced ceramic shell MOR value was obtained. Nonetheless, presence of the fused silica phase from rice husk fiber was also found to lead the formation of a new phase of zircon (ZrSiO4). These two factors were found to influence the ceramic shell composition and indirectly enhanced the ceramic shell strength performance.

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X-ray diffraction analysis of silicon prepared from rice husk ash

Cited by 50 publications

References 5 publications

Biosilica Properties from Rice Husk using Various HCl Concentrations and Frequency Sources

Biosilica Properties from Rice Husk using Various HCl Concentrations and Frequency Sources

Reduction behaviour of rice husk ash for preparation of high purity silicon

Effect of Rice Husk on Fired Ceramic Shell Strength

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