scholarly journals High-purity amorphous silica from rice husk: Preparation and characterization

2018 ◽  
Vol 56 (6) ◽  
pp. 730-736 ◽  
Author(s):  
Nguyen Nguyen Ngoc ◽  
Le Xuan Thanh ◽  
La The Vinh ◽  
Bui Thi Van Anh
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity

Effect of Temperature in Extraction of High Purity Amorphous Silica from Rice Husk for Silicon Production

2015 ◽  
pp. 219-227
Author(s):  
C. E. Ilochonwu ◽  
C. O. Nwajagu ◽  
I. U. Onyenanu ◽  
E. I. Nwonye
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity ◽  
Effect Of Temperature ◽  
Silicon Production

Effect of Temperature in Extraction of High Purity Amorphous Silica from Rice Husk for Silicon Production

2015 ◽  
pp. 219-227
Author(s):  
C. E. Ilochonwu ◽  
C. O. Nwajagu ◽  
I. U. Onyenanu ◽  
E. I. Nwonye
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity ◽  
Effect Of Temperature ◽  
Silicon Production

scholarly journals Production of High Purity Amorphous Silica from Rice Husk

2016 ◽  
Vol 19 ◽  
pp. 189-195 ◽  
Author(s):  
Rohani Abu Bakar ◽  
Rosiyah Yahya ◽  
Seng Neon Gan
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity

Effect of Acid Leaching on Different State of Rice Husk

2020 ◽  
Vol 1010 ◽  
pp. 532-537
Author(s):  
Nur Haslinda Mohamed Muzni ◽  
Noorina Hidayu Jamil ◽  
Faizul Che Pa ◽  
Wan Mohd Arif
Keyword(s):  
Citric Acid ◽  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity ◽  
Rice Husk Ash ◽  
Combustion Process ◽  
Acid Leaching ◽  
Silica Content ◽  
Composition Analysis ◽  
Surface Areas

Rice husks (RH) are agricultural wastes available abundantly in rice producing country. A by-product obtained from combustion of rice husk is rice husk ash (RHA) which is rich in silica (SiO2) contents. This paper focused on the effect of acid leaching treatment on rice husk to produce high-purity silica. There are 4 different states of conditions involved; raw rice husk (RRH), treated rice husk (TRH), rice husk ash (RHA), and treated rice husk ash (TRHA). Citric acid; C6H8O7 was used as a leaching agent. TRH and TRHA was leached to see whether treated rice husk before combustion (TRH) or treated rice husk after combustion (TRHA) will produce more high-purity silica. Chemical composition analysis shows high amorphous silica content which is 98.47% with low metallic impurities at 1.0M C6H8O7, 70 oC for treated rice husk (TRH). X-ray diffraction (XRD) pattern shows the presence of amorphous silica in treated rice husk (TRH) and crystalline silica in treated rice husk ash (TRHA). Fragmentation of TRH into small pieces after acid leaching is seen where there is significant increase in the exposed surface areas. High-purity amorphous silica with more than 98% was prepared via citric acid leaching treatment and combustion process.

scholarly journals Extraction of high purity amorphous silica from rice husk by chemical process

2020 ◽  
Vol 881 ◽  
pp. 012096
Author(s):  
Sami abualnoun Ajeel ◽  
Khalid A. Sukkar ◽  
Naser Korde Zedin
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
High Purity ◽  
Chemical Process

Mechanoactivation Of Rice Husk Ash In Laboratory Conditions

2019 ◽  
pp. 20-26
Keyword(s):  
Mechanical Activation ◽  
Rice Husk ◽  
Amorphous Silica ◽  
Silicon Oxide ◽  
Rice Husk Ash ◽  
Pozzolanic Activity ◽  
Maximum Solubility ◽  
Laboratory Conditions ◽  
Before And After ◽  
Mineral Additive

In many rice producing countries of the world, including in Vietnam, various research aimed at using rice husk ash (RHA) as a finely dispersed active mineral additive in cements, concrete and mortars are being conducted. The effect of the duration of the mechanoactivation of the RHA, produced under laboratory conditions in Vietnam, on its pozzolanic activity were investigated in this study. The composition of ash was investigated by laser granulometry and the values of indicators characterizing the dispersion of its particles before and after mechanical activation were established. The content of soluble amorphous silicon oxide in rice husk ash samples was determined by photocolorimetric analysis. The pizzolanic activity of the RHA, fly ash and the silica fume was also compared according to the method of absorption of the solution of the active mineral additive. It is established that the duration of the mechanical activation of rice husk ash by grinding in a vibratory mill is optimal for increasing its pozzolanic activity, since it simultaneously results in the production of the most dispersed ash particles with the highest specific surface area and maximum solubility of the amorphous silica contained in it. Longer grinding does not lead to further reduction in the size of ash particles, which can be explained by their aggregation, and also reduces the solubility of amorphous silica in an aqueous alkaline medium.

scholarly journals Simultaneous amorphous silica and phosphorus recovery from rice husk poultry litter ash

RSC Advances ◽  
2021 ◽  
Vol 11 (15) ◽  
pp. 8927-8939
Author(s):  
Laura Fiameni ◽  
Ahmad Assi ◽  
Ario Fahimi ◽  
Bruno Valentim ◽  
Karen Moreira ◽  
...  
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
Poultry Litter ◽  
Phosphorus Recovery ◽  
Secondary Source ◽  
Poultry Litter Ash

Rice husk poultry litter ash (RHPLA) is proposed as a valuable secondary source to recover phopshorus and amorphous silica in three steps.

Clean Preparation of High-Purity Silicon from Rice Husk Ash by a Modified Metallurgical Method

JOM ◽  
2021 ◽  
Author(s):  
Jian Kong ◽  
Donghui Wei ◽  
Pengfei Xing ◽  
Yanxin Zhuang ◽  
Xing Jin ◽  
...  
Keyword(s):  
Rice Husk ◽  
High Purity ◽  
Rice Husk Ash ◽  
High Purity Silicon
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