Studies on the formation of black particles in rice husk silica ash

Krishnarao, R. V.; Subrahmanyam, J.; Kumar, T. Jagadish

doi:10.1016/s0955-2219(00)00170-9

Cited by 271 publications

(203 citation statements)

References 11 publications

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“…The colors of biomass ash turned light grey with the increased burning time. Furthermore, whatever the time of burning, there were no black carbon particles observed on the surface of 600 °C biomass ashes, which is in good accordance with the formation mechanism of black particles in RHA (Krishnarao et al 2001). Previous reports (Niu et al 2010a;Du et al 2014) suggested that K2O starts to decompose at 620 °C, and the released potassium could help these particles containing rich SiO2 to melt gradually.…”

Section: Influence Of Ashing Conditions On Agglomeration Properties Osupporting

confidence: 84%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

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Three typical biomass fuels-rice husk, rice straw, and corn cobs-were combusted to understand the effects of ashing temperature on ash fouling and slagging characteristics. The ashes generated from combustion at 600 °C and 815 °C were characterized thoroughly with regard to their chemical composition. The systematic slagging/fouling indices of biomass were used to study the effects of ashing temperature on ash fouling and slagging propensities. The results showed that ashing temperature had a remarkable influence on ash composition, particle size distribution, ash morphology, ash fusibility, and thermal properties. Increased ashing temperature resulted in the expansion of ash particles together with the volatilization of alkali metals in the form of inorganic salts. Morphology analysis indicated that high ashing temperatures promoted biomass ash slagging. Ash fusion points increased at elevated ashing temperatures, while the ash content decreased. As a result of the volatilization and decomposition of biomass ash, a four-step mechanism of weight loss was clearly identified by thermal analysis. All prepared biomass ashes resulted in slagging and fouling problems at different levels during the thermochemical conversion of biomass.

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Section: Influence Of Ashing Conditions On Agglomeration Properties Osupporting

confidence: 84%

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Yao

Yan

et al. 2017

BioResources

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“…In this case, it is possible to produce a high-purity amorphous silica with high specific surface area by removing carbon and other metallic impurities before calcination. 19,20 It has been found that potassium oxide from rice husk causes the negative effect of the silica surface melting and the crystallization of amorphous silica into cristobalite and tridymite. 21,22 Considering that there are few studies on the properties of SCSA and that works investigating the influence of pretreatment of sugar cane bagasse and straw ashes on the pozzolanic activity are rare, this research aims at studying the feasibility of producing pozzolanic materials from sugar cane straw submitted to different pretreatments.…”

Section: Introductionmentioning

confidence: 99%

Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Cordeiro¹,

Vieira²,

Lopes³

2017

Quim. Nova

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This work systematically describes a laboratory study on different pretreatments of sugar cane straw to produce pozzolanic ash. Two procedures were used to accelerate the hydrolysis of celluloses and hemicelluloses and remove metallic impurities present in significant levels in sugar cane straw: hot water washing and acid leaching. Proximate analysis by thermogravimetry was carried out to cover volatile matter, fixed carbon, and ash content of the different straws. Detailed measurements of X-ray diffraction, oxide percentages, loss on ignition, and BET specific surface area were performed to compare hot water washed, acid leached, and nonpretreated ashes, after controlled processes of burning and grinding. The pozzolanic activity of the ashes was evaluated from the modified Chapelle and electrical conductivity methods. The results revealed that ashes with a high content of amorphous silica were produced, in spite of the straw pretreatments. However, both straw pretreatments induced a significant increase in pozzolanic activity, mainly associated with the removal of impurities, especially CaO, SO 3 , K 2 O, and carbon compounds. The effect of the hot water washing treatment was relatively small in relation to the acid leaching, but the hot washed ash was significantly more pozzolanic than non-treated ash.

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“…The major impurity is a form of trapped carbon. The impurity reduces the filler efficiency in composites [14].…”

Section: Introductionmentioning

confidence: 99%

Rice husk ash – A valuable reinforcement for high density polyethylene

et al. 2012

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Studies on the formation of black particles in rice husk silica ash

Cited by 271 publications

References 11 publications

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

The Influence of Ashing Temperature on Ash Fouling and Slagging Characteristics during Combustion of Biomass Fuels

Study on the pozzolanic activity of sugar cane straw ash produced using different pretreatments

Rice husk ash – A valuable reinforcement for high density polyethylene

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