Effect of Rice Husk Firing Temperature on Synthesis of Silica (SiO&lt;sub&gt;2&lt;/sub&gt;)

Ismail, Noorli; Azmi, Mohd Azham; Ahmad, Sufizar; Taib, Hariati

doi:10.4028/www.scientific.net/amr.1087.470

Cited by 14 publications

(14 citation statements)

References 12 publications

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“…This process happened because of thermal decomposition of hemicellulose and cellulose; a major organic component in the rice husk. Previous study said that mainly at 150°C to 360°C which is the least stable component of rice husk and cellulose decomposed between 275°C to 350°C [12]. Fig.…”

Section: A Thermogravimetric Analysis (Tga)mentioning

confidence: 90%

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Study of Characteristics of Rice Husk and Silica Obtained from Rice Husk

Zainal¹,

Mohamad²,

Mustapa³

et al. 2018

IJCEA

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This paper presents the study of the features of the rice husk and to investigate the presence of silica in the rice husk. To obtain the pure silica, the rice husk was firstly washed and went through chemical treatment, prior to combustion. The combustion process was conducted at temperature of 700℃ for 2 hours. The rice husk ash obtained was studied and has been named as C3. The characteristics of C3 samples can be acquired by using scanning electron microscopy (SEM), x-ray diffractometer (XRD) and thermogravimetric analysis (TGA). The SEM images showed the material was in agglomeration. The silica content of C3 was observed to be 89.85% using EDS. The thermal properties of the C3 also was performed using TGA as the change with temperature up to 1000℃ with heating rate of 5℃/min. As from the result, the energy of organic compound lose at 700℃ was 0.0141mg/min and at 1000℃ was 0.00217 mg/min.

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Section: A Thermogravimetric Analysis (Tga)mentioning

confidence: 90%

“…A. lsmail et al, the crystalline structure was not formed around 700℃to 900℃. The formation was existed after firing the rice husk at 1000℃ and above until it reach the phase of breaking point to quartz phase [12]. In Fig.…”

Section: A Scanning Electron Microscopy (Sem) Analysis Of Rice Huskmentioning

confidence: 96%

Study of Characteristics of Rice Husk and Silica Obtained from Rice Husk

Zainal¹,

Mohamad²,

Mustapa³

et al. 2018

IJCEA

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“…According to Ismail et al and D.R. Lee, the peaks were very narrow and intense at higher burning temperature (above 1100°C) which is reflecting higher crystallinity [11,19]. However, contamination occur while burning process of rice husk ash as Al2O3 increased as shown in XRF data and the formation of Corundum peaks appeared in XRD graph analysis.…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

“…The burning of rice husk has specific benefits, changing rice husk from a valueless to valuable materials such as silica were its produced higher percentage of silica than other biomass fuels, were its was an excellent source of silica that can replace other conventional silica sources [7,8]. The usage of rice husk ash increased the compressive strength [9] According to Boateng et al, and Ismail et al, amorphous silica was detected in rice husk ash below 800°C, while crystallization of silica overtakes after this temperature [10,11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Burning Temperature on Rice Husk Silica as Reinforcement of Recycled Aluminium Chip AA7075

Joharudin¹,

Latif²,

Mustapa³

et al. 2020

ARFMTS

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Aluminium recycling is now a well-known technique used in material manufacturing because it consumes less energy and is environmentally friendly. This paper presents the effect of burning temperature on rice husk silica as reinforcement of recycled Aluminium chip AA7075 on physical properties and hardness. Rice husk silica was prepared without any chemical treatments which are original rice husk (O), rice husk ash burned at 700°C (RHA) and calcination of rice husk ash burned at 1000°C (CRHA). Recycled Aluminium chip AA7075 reinforced with rice husk silica i.e., 2.5 wt.%, 5 wt.%, 7.5 wt.%, 10 wt.% and 12.5 wt.% were prepared. Analyses of silica were conducted by using x-ray diffraction (XRD) and x-ray fluorescence (XRF) test. Silica remains to be in amorphous phases for original rice husk and rice husk ash at 700°C. However, at a burning temperature of 1000°C, silica was observed in semi crystalline phase. Porosity and water absorption of composite of metal matrix increased with an increasing the composition of rice husk silica. The hardness of composite of metal matrix improved with increasing rice husk silica, while the hardness of chip AA7075/O and chip AA7075/CRHA decreased with increasing rice husk silica. Based on investigation to Aluminium reinforced rice husk at different burning temperatures, amorphous phase of silica burned at 700°C shows good potential to improve the hardness of material by appropriate composition of rice husk silica.

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“…The cellular material has a high SSA due to its external and internal pores [5]. The pozzolanic reactivity also depends on the RHA burning temperature [6] and retention time [7] used to produce amorphous silica, which is considered the most important property determining the pozzolanic reactivity [3], in addition to the degree of RHA grinding [8]. The dependence on the grinding degree occurs because a decrease in the RHA particle size will increase its pozzolanic reactivity, as indicated by the variation in the strength activity index (SAI) with increasing grinding time, especially if the particle size is on the nano-scale [9].…”

Section: Introductionmentioning

confidence: 99%

Role of low-cost nano RHA on physico-mechanical properties of cement mortar

Mostafa

Salah²,

Shehata

2019

Egypt. J. Chem.

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T HIS WORK compares nano-structured rice husk ash (RHA) before grinding and nano-sized RHA after grinding in terms of the physical properties of cement and mortar performance. Blaine surface area, sieve analysis (45 µm mesh), water of consistency, expansion, initial and final setting time, and compressive strength (at 2, 7, 28, 60 and 90 d of curing) measurements were performed for 0, 2, 4, 6, 8 and 10% RHA replacement of cement by weight. RHA both before and after grinding enhanced the cement physical and mechanical properties, as well as the mortar performance in terms of the long-term aged strength, at a constant water/cement ratio and without the use of any type of super-plasticizer (SP). The enhancement became stable at all long-term ages for 10% replacement in the case of RHA before grinding and 4% replacement in the case of RHA after grinding. More considerable enhancements were observed with a high replacement percentage up to 10% nano-sized RHA due to the small size of its particles, which increased the pozzolanic reactivity and worked as a filler material to produce a denser mortar.

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Effect of Rice Husk Firing Temperature on Synthesis of Silica (SiO<sub>2</sub>)

Cited by 14 publications

References 12 publications

Study of Characteristics of Rice Husk and Silica Obtained from Rice Husk

Study of Characteristics of Rice Husk and Silica Obtained from Rice Husk

Effect of Burning Temperature on Rice Husk Silica as Reinforcement of Recycled Aluminium Chip AA7075

Role of low-cost nano RHA on physico-mechanical properties of cement mortar

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