Sustainable production of pure silica from rice husk waste in Kazakhstan

Azat, Seitkhan; Korobeinyk, Alina V.; Μουστάκας, Κωνσταντίνος; Inglezakis, Vassilis J.

doi:10.1016/j.jclepro.2019.01.142

Cited by 173 publications

(91 citation statements)

References 30 publications

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“…Therefore, RHA can be a potential source for production of silica that not only reduce the dependency of extraction of silica from virgin resources, like quartz, granite, and gravel sand stone, but also solve the disposal problem of waste materials . This silica is reported to be used for production of silicon‐based material such as concrete, laboratory glass wares, absorbents silicon carbide, silicon nitride, and zeolites . Silica extracted from RHA can also be used for production of metallurgical grade silicon (MG‐Si) and solar grade silicon (purity level equivalent to 99.99% and 99.9999%, respectively) reported by several authors …”

Section: Introductionmentioning

confidence: 99%

“…The same authors also reported that efficiency of removal of impurities diminished with increase in HCl acid concentration. For alkaline‐SiO 2 separation process, NaOH was mostly preferred for extraction of silica with purity level above 95% . However, due to high cost of NaOH, few researchers have used carbonate like Na 2 CO 3 for extraction of silica from RHA and found comparative results .…”

Section: Introductionmentioning

confidence: 99%

“…6 This silica is reported to be used for production of silicon-based material such as concrete, laboratory glass wares, absorbents silicon carbide, silicon nitride, and zeolites. [7][8][9] Silica extracted from RHA can also be used for production of metallurgical grade silicon (MG-Si) and solar grade silicon (purity level equivalent to 99.99% and 99.9999%, respectively) reported by several authors. 10,11 Silica is generally found in the earth crust that exhibits either crystalline or amorphous structure.…”

Section: Introductionmentioning

confidence: 99%

“…For alkaline-SiO 2 separation process, NaOH was mostly preferred for extraction of silica with purity level above 95%. 9,17,18 However, due to high cost of NaOH, few researchers have used carbonate like Na 2 CO 3 for extraction of silica from RHA and found comparative results. 19,20 Although there are several articles available on yield, purity, and properties of silica nanoparticles extracted from RHA using NaOH, no literature has been reported on yield, purity, and properties of silica when extracted using KOH and K 2 CO 3 .…”

Section: Introductionmentioning

confidence: 99%

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Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Nayak

Nandi

Datta

2019

Engineering Reports

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In the present study, an attempt has been made to extract commercial grade amorphous silica nanoparticles from rice husk (RH) using four different chemicals (NaOH, KOH, Na2CO3, and K2CO3) and two washing solvents (water and ethanol). The elemental, structural, and morphological characterizations of the silica samples were carried out using scanning electron microscopy coupled with energy‐dispersive X‐ray spectroscopy (SEM‐EDS), atomic absorption spectrometry (AAS), X‐ray diffraction (XRD), and Fourier‐transform infrared spectroscopy (FTIR). The combined NaOH and water treatment was found to be the most efficient method in terms of recovery of silica sample, while combined Na2CO3 and water treatment was more suitable for obtaining pure silica. No significant difference in the percentage recovery of silica was observed between the two washing treatments at p < 0.05. Scanning electron micrographs of the Na2CO3‐cum‐water and K2CO3‐cum‐water treated samples showed nonagglomerated silica nanoparticles. The XRD analysis of silica obtained from these two treatments was also free from any sharp peaks illustrating pure amorphous structure of silica. EDS and AAS study of K2CO3‐cum‐water treated samples showed higher mineral impurities compared to Na2CO3‐cum‐water treated sample. It could be inferred that silica obtained from Na2CO3 and water washing treatment can be used for extraction of metallurgical grade silicon.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Nayak

Nandi

Datta

2019

Engineering Reports

View full text Add to dashboard Cite

show abstract

“…The moisture content of rice husk is higher than OPEFB. The hygroscopic behavior of rice husk is related to the high content of silica [29]. The ash content of rice husk is also much higher than OPEFB, where some reports showed that rice husk substantially had ash content higher than 15 % and the major component is silica compound.…”

Section: Results and Discussion 31 Characterization Of Rice Husk Anmentioning

confidence: 99%

Bio-oil and Fuel Gas Production from Agricultural Waste via Pyrolysis: A Comparative Study of Oil Palm Empty Fruit Bunches (OPEFB) and Rice Husk

Kusworo¹,

Widayat²,

Mahadita³

et al. 2019

Period. Polytech. Chem. Eng.

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Biomass-based energy from agricultural wastes is a promising alternative energy source since its abundant supply and renewable. Biomass is converted into gas and liquid fuel through biochemical or thermochemical treatments. In this work, oil palm empty fruit bunches (OPEFB) and rice husk are pyrolyzed to produce gas and liquid fuel. The reactor temperature and feed mass are varied to obtain the best operating condition in a semi-batch pyrolysis reactor. The experimental results showed that the best operating temperature in pyrolysis process to produce bio-oils from OPEFB and rice husk was at 500 °C with 4.3 % (w/w) and 2.6 % (w/w) of bio-oil yields, respectively. The pyrolysis product distribution and their chemical composition are strongly affected by operating condition and the types of biomass. The GC-MS analysis results showed that the primary pyrolysis products components consist of hydrocarbons and oxygenated compounds such as carboxylic acids, phenols, ketones and aldehydes. Thermodynamic properties such as thermal conductivity of the biomass also influenced the product distribution of the biomass pyrolysis.

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Influences of pretreatment, extraction variables, and post treatment on bench‐scale rice husk black ash (RHBA) processing to bio‐silica

Steven

Restiawaty

Pasymi

et al. 2021

Asia-Pacific J Chem Eng

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Abundant availability and large silica content in rice husk black ash (RHBA) make the use of it very interesting to study. Many works only deal with lab‐scale rice husk ash extraction while the studies on bench‐scale RHBA extraction are still limited. This study, hence, presents the influence of pretreatment, extraction variables, and posttreatment on bench‐scale RHBA processing to bio‐silica. The pretreatment through acid leaching was carried out using HCl. The extraction was implemented under varying process variables such as alkaline‐to‐feed ratio (RA/F), extraction duration, and acid precipitation agent. According to this study, the highest extraction yield up to 98% was gained under RA/F 6 g/g and 1‐h extraction. The amorphous bio‐silica had an asymmetric siloxane bond and white appearance with a purity exceeding 95% and surface area up to 406.98 m2/g. Meanwhile, precipitation under HCl and H2SO4 had little impact on product purity and surface area. This study exhibits that acid leaching is executed to release mineral impurities but is still not sufficient to remove the remaining carbon content in bio‐silica. However, the contribution of refining process is able to do so. Moreover, the produced bio‐silica is suitable for adsorbent purposes which could adsorb up to 83.5% of 3‐monochloropropanediol compound.

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Sustainable production of pure silica from rice husk waste in Kazakhstan

Cited by 173 publications

References 30 publications

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Comparative assessment of chemical treatments on extraction potential of commercial grade silica from rice husk

Bio-oil and Fuel Gas Production from Agricultural Waste via Pyrolysis: A Comparative Study of Oil Palm Empty Fruit Bunches (OPEFB) and Rice Husk

Influences of pretreatment, extraction variables, and post treatment on bench‐scale rice husk black ash (RHBA) processing to bio‐silica

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