Two-Stage Continuous Process for the Extraction of Silica from Rice Husk Using Attrition Ball Milling and Alkaline Leaching Methods

Ji Yeon Park, Yang Mo Gu, Seon Young Park, Ee Taek Hwang, Byoung-In Sang, Jinyoung Chun and Jin Hyung Lee
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Ji Yeon Park: Korea Institute of Ceramic Engineering and Technology (KICET), Heungdeok-gu, Cheongju-si 28160, Korea
Yang Mo Gu: Korea Institute of Ceramic Engineering and Technology (KICET), Heungdeok-gu, Cheongju-si 28160, Korea
Seon Young Park: Korea Institute of Ceramic Engineering and Technology (KICET), Heungdeok-gu, Cheongju-si 28160, Korea
Ee Taek Hwang: Department of Food Biotechnology, Dong-A University, Busan 49315, Korea
Byoung-In Sang: Division of Chemical Engineering & Bio Engineering, Hanyang University, Seoul 04763, Korea
Jinyoung Chun: Korea Institute of Ceramic Engineering and Technology (KICET), Heungdeok-gu, Cheongju-si 28160, Korea
Jin Hyung Lee: Korea Institute of Ceramic Engineering and Technology (KICET), Heungdeok-gu, Cheongju-si 28160, Korea

Sustainability, 2021, vol. 13, issue 13, 1-11

Abstract: A two-stage continuous process was developed for improved silica extraction from rice husk. The two-stage continuous process consists of attrition ball milling and alkaline leaching methods. To find the optimum conditions for the continuous process, the effects of alkaline leaching parameters, such as the alkaline solution type and reaction conditions, on the silica extraction yield were investigated in a batch process. The use of NaOH showed a slightly higher silica yield than KOH. The optimum reaction conditions were found to be 0.2 M, 80 °C, 3 h, and 6% ( w / v ) for the reaction concentration, temperature, duration time, and solid content, respectively. Attrition ball milling was used to make micron-sized rice husk particles and to improve the fluidity of the rice husk slurry. The two-stage continuous process was performed using optimum conditions as determined based on the results of the batch experiment. The two-stage continuous extraction was stably operated for 80 h with an 89% silica yield. During the operation, the solid content remained consistent at 6% ( w / v ). The obtained silica was characterized using inductively coupled plasma–optical emission spectrometry (ICP–OES), X-ray diffraction (XRD), and the Brunauer–Emmett–Teller (BET) method.

Keywords: silica; rice husk; alkaline leaching; continuous process; biomass; bio-based material (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
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