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240419s2024 xx |||||o 00| ||eng c |
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|a 10.1016/j.wasman.2024.04.009
|2 doi
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|a pubmed25n1236.xml
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|a (NLM)38636126
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|a (PII)S0956-053X(24)00199-5
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Hirose Carlsen, Mai-Mari
|e verfasserin
|4 aut
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| 245 |
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|a Phase diagram of SiO2 crystallization upon rice husk combustion to control silica ash quality
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|c 2024
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 10.05.2024
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|a Date Revised 10.05.2024
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2024 The Authors. Published by Elsevier Ltd.. All rights reserved.
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|a Rice husk (RH), which is an abundant agricultural waste, consists of ca. 20 % silica (SiO2·nH2O). Upon RH combustion, a large amount of silica ash is generated. RH silica is originally amorphous; however, the ash is crystalized depending on the conditions of the combustion. Crystallization of RH occurs at a much lower temperature than that of pure SiO2 due to the eutectic effects of minerals, such as Na and K, that are initially present in RH. Controlling for anti-crystallization is required for expanding the possibility of using RH ash that is abundantly generated by combustion. Here, RH is combusted, followed by a highly thermocontrolled investigation, and the time and temperature dependency of RH ash crystallization are studied. Crystallization is avoidable when the ash is rapidly cooled; for instance, 20 °C/min cooling can avoid crystallization even if the combustion temperature reaches 950 °C. Various pathway patterns for achieving temperature and cooling ratio are plotted on a uniform diagram of temperature vs. time. Furthermore, a border zone, indicating the regions in which RH ash becomes amorphous and crystals, is successfully drawn into the diagram by using the data maintained at a constant temperature. A comparison with a few different types of RH showed that the border zone on the diagram can move depending on their ratios of inorganic elements, causing a eutectic effect
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|a Journal Article
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|a Amorphous
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|a Combustion
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|a Crystallization
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|a Rice husk
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|a Silica ash
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|a Silicon Dioxide
|2 NLM
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|a 7631-86-9
|2 NLM
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| 700 |
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|a Saito, Yukie
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Waste management (New York, N.Y.)
|d 1999
|g 182(2024) vom: 15. Juni, Seite 55-62
|w (DE-627)NLM098197061
|x 1879-2456
|7 nnas
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| 773 |
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|g volume:182
|g year:2024
|g day:15
|g month:06
|g pages:55-62
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|u http://dx.doi.org/10.1016/j.wasman.2024.04.009
|3 Volltext
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