Journal ArticleDOI
Removal of metal impurities in rice husk and characterization of rice husk ash under simplified acid pretreatment process
TLDR
In this paper, the acid pretreatment process and combustion condition of rice husk ash (RHA) at various combustion temperatures are comprehensively investigated in comparison with previous results by scanning electron microscope (SEM), X-ray fluorescence (XRF), XRD, and surface analyzer.Abstract:
Acid pretreatment plays an important role in the preparation of amorphous silica with high activity and high specific surface area before combustion process. However, some limitations and problems exist in the pretreatment process of previous literatures. On the basis of this, this work is aimed at simplifying the acid pretreatment process and combustion condition, which could present a more advantageous process for practical industrial applications. Then the removal percentage and behavior of metal impurities in rice husk is studied by ICP-OES, and effects of acid pretreatment on properties of rice husk ash (RHA) at various combustion temperatures are comprehensively investigated in comparison with previous results by scanning electron microscope (SEM), X-ray fluorescence (XRF), X-ray diffractometer (XRD), and surface analyzer. The results suggest that the removal degree of each metal is various due to each chemical form in rice husk, of which removal percentage of K is especially remarkable. The contributions of simplified acid pretreatment to the properties of RHA are equally prominent: smaller nanoscale particles, higher purity, and specific surface area of above 200 m2/g. In addition, the pretreatment can also eliminate the crystallization and keep the high activity of RHA in combustion temperature range of 600–900°C. © 2017 American Institute of Chemical Engineers Environ Prog, 36: 830–837, 2017read more
Citations
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Conversion of wheat husk to high surface area activated carbon for energy storage in high-performance supercapacitors
TL;DR: In this paper, the wheat husks derived activated carbon (WHAC) was employed as electrode material for supercapacitors' energy storage, and three samples of activated carbon were made using wheat hulls, which were activated at different temperatures.
Journal ArticleDOI
Generation of High Quality Biogenic Silica by Combustion of Rice Husk and Rice Straw Combined with Pre- and Post-Treatment Strategies—A Review
Hossein Beidaghy Dizaji,Thomas Zeng,Ingo Hartmann,Dirk Enke,Thomas Schliermann,Volker Lenz,Mehdi Bidabadi +6 more
TL;DR: In this article, a comprehensive literature review on rice husk and rice straw combustion as well as applied strategies for raw material pre-treatment and/or post-treatment of resulting ashes to obtain high quality biogenic silica.
Journal ArticleDOI
Ash transformation mechanism during combustion of rice husk and rice straw
TL;DR: In this article, the impact of impurities on the atomic structure of silica resulting in an altered ash melting behavior and viscosity of the silica-rich ashes was analyzed.
Journal ArticleDOI
Ash transformation mechanism during combustion of rice husk and rice straw
TL;DR: In this article , the impact of impurities on the atomic structure of silica resulting in an altered ash melting behavior and viscosity of the silica-rich ashes was analyzed.
Journal ArticleDOI
Extraction of high-purity silica from rice husk via hydrochloric acid leaching treatment
TL;DR: In this paper, the acid leaching of rice husk (RH) in 2 M hydrochloric acid solution before the calcination process at 600 $ √ c$C was proposed to achieve completely white silica with high specific surface area and low content of impurities.
References
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A structural investigation relating to the pozzolanic activity of rice husk ashes
TL;DR: A structural study of RHA samples in relation to their reactivity has been performed; Silica in RHA formed by burning rice husk in a laboratory furnace under continuous supply of air have been characterized as a function of incineration temperature, time and cooling regime as mentioned in this paper.
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The study of using rice husk ash to produce ultra high performance concrete
TL;DR: In this paper, the authors investigated the possibility of using Rice Husk Ash (RHA) to produce ultra high performance concrete (UHPC) and found that the compressive strength of UHPC incorporating RHA, with the mean size between 3.6μm and 9μm, can be achieved in excess of 150 MPa with normal curing regime.
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Studies on the formation of black particles in rice husk silica ash
TL;DR: In this article, the formation of black particles in the silica obtained by calcination of raw untreated rice husks, is higher than that in acid treated rice hulls, and the tendency to form black particles increases with increase in the heating rate and the temperature of calcination.
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Synthesis and surface characteristics of nanosilica produced from alkali-extracted rice husk ash
Tzong-Horng Liou,Chun-Chen Yang +1 more
TL;DR: In this article, the authors used rice husk as a raw material to prepare nanosilica without adding an extra surfactant and found that the surface characteristics of the sample depend mainly upon gelation pH.
Journal ArticleDOI
Comparison of two processes for treating rice husk ash for use in high performance concrete
TL;DR: In this paper, a chemical treatment before burning of Rice husk ashes (RHA) was reported to improve the effectiveness of the RHA and the resulting ash was compared to ash produced by conventional incineration (TRHA).