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

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...

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Veröffentlicht in:Sustainability 2021-07, Vol.13 (13), p.7350
Hauptverfasser: Park, Ji Yeon, Gu, Yang Mo, Park, Seon Young, Hwang, Ee Taek, Sang, Byoung-In, Chun, Jinyoung, Lee, Jin Hyung
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container_issue 13
container_start_page 7350
container_title Sustainability
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creator Park, Ji Yeon
Gu, Yang Mo
Park, Seon Young
Hwang, Ee Taek
Sang, Byoung-In
Chun, Jinyoung
Lee, Jin Hyung
description 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.
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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.</description><identifier>ISSN: 2071-1050</identifier><identifier>EISSN: 2071-1050</identifier><identifier>DOI: 10.3390/su13137350</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Alkaline leaching ; Ball milling ; Biomass ; Carbohydrates ; Caustic soda ; Factorial experiments ; Fluidity ; Inductively coupled plasma ; Leaching ; Lignin ; Nanoparticles ; Optical emission spectroscopy ; Potash ; Potassium ; Rice ; Silica ; Slurries ; Sodium ; Sodium hydroxide ; Spectrometry ; Taguchi methods ; X-ray diffraction ; Yield</subject><ispartof>Sustainability, 2021-07, Vol.13 (13), p.7350</ispartof><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. 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subjects Alkaline leaching
Ball milling
Biomass
Carbohydrates
Caustic soda
Factorial experiments
Fluidity
Inductively coupled plasma
Leaching
Lignin
Nanoparticles
Optical emission spectroscopy
Potash
Potassium
Rice
Silica
Slurries
Sodium
Sodium hydroxide
Spectrometry
Taguchi methods
X-ray diffraction
Yield
title Two-Stage Continuous Process for the Extraction of Silica from Rice Husk Using Attrition Ball Milling and Alkaline Leaching Methods
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