Removal of Iron (Fe) in Rice Husk via Citric Acid Leaching Treatment

Abstract:

Rice husk (RH) is an agricultural waste which has been utilized as useful renewable resources to produce energy with high-purity silica (SiO2) contents. With such a large availability of rice husk, it becomes economical to industrial applications. This paper was study about the removal of iron from rice husk in aqueous citric acid by using acid leaching treatment. The parameters chosen were reaction temperature, stirring speed, acid concentration and stirring time. The optimum conditions for the maximum removal of 0.14% of iron with citric acid leaching treatment were observed at solution temperature of 70°C; thermostat magnetic stirrer hotplate, 150 W; acid concentration 0.1M-1.0M; stirring time 6h-12h. This method resulted the removal efficiency of iron increasing considerably with the increasing leach C₂H₇O₈ acid concentration. The optimization of the process conditions of the citric acid leaching treatment under the optimum conditions with 6h of stirring time and acid concentration of 1.0M were conducted to remove the metallic impurities of Fe from husks and shows remarkable result.

• Periodical: Materials Science Forum (Volume 857)
• Pages: 540-546
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.857.540
• Online since: May 2016
• Authors: Nur Haslinda Mohamed Muzni, Noorina Hidayu Jamil, Yeoh Cheow Keat
• Keywords: Acid Leaching Treatment, Citric Acid, Iron Impurities, Rice Husk, Stirring Time

References

[1] Junko Umeda and Katsuyoshi Kondoh. High-purification of amorphous silica originated from rice husks by combination of polysaccharide hydrolysis and metallic impurities removal. Industrial Crops and Products 32 (2010) 539–544.

DOI: 10.1016/j.indcrop.2010.07.002

[2] C. Real, M.D. Alcala, J.M. Criado, Preparation of silica from rice husks, Journal of the American Ceramic Society 79 (1996) 2012-(2016).

DOI: 10.1111/j.1151-2916.1996.tb08931.x

[3] M.F. de Souzaa et al. (2000). Rice Hull-Derived Silica: Applications in Portland Cement and Mullite Whiskers, Materials Research, Vol. 3, No. 2, 25-30.

DOI: 10.1590/s1516-14392000000200005

[4] Fatma Deniz Ayhan and Halime Abakay Temel, 2011. Removal of impurities from tailing (quartz) obtained from Bitlis Kyanite ore by floatation method. International Journal of Applied Science and Technology. 1, 74-81.

[5] Othman Mamat and Iyenagbe B. Ugheoke, 2012. A critical assessment and new research directions of rice husk silica processing methods and properties. Maejo International Journal of Science and Technology. 6(03), 430-448.

[6] Umeda Junko & Kondoh Katsuyoshi (2008). Process Optimization to Prepare High-Purity Amorphous Silica from Rice Husk via Citric Acid Leaching Treatment, Transaction of JWRI 37(1), 13-17.

DOI: 10.1007/s10853-008-3060-9

[7] H.L. Zhao, D.X. Wang, Y.X. Cai, and F.C. Zhang : Removal of iron from silica sand by surface cleaning using power ultrasound. Minerals Engineering 20 (2007) 816–818.

DOI: 10.1016/j.mineng.2006.10.005

[8] Chandrasekar S, Satyanarayana KG, Raghavan PN (2003) Processing, properties and applications of reactive silica from rice husk—an overview. Mater Sci J 38: 3159–3168. doi: 10. 1023/A: 1025157114800.