Efficient Pretreatment and Microwave Assisted Leaching of Silica from Biomass and Their Optimization (original) (raw)
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The effect of chemical treatment on the production of active silica from rice husk
… mining congress and exhibition of Turkey- …, 2003
In this study the effect of chemical treatment on the production of high purity silica from rice husk was investigated. Rice husk, supplied from Kastomonu region-Turkey, was used as a sources of silica. They were washed with water to remove the contaminants present in them then dried in an oven at 100"C for 24 h. The dried husks were then subjected to the chemical treatment before calcinations in order to increase silica contents of husk ash. In experiments, HCl was used as a leaching reagent for extracting inorganic impu rities from the husk and the affect of leaching temperature, reactive concentration, leaching time and solid percent on the purity of silica ash were systematically investigated. The results of leaching test showed that high purity amorphous silica could be produced with a 99.74 °/t grade. The surface properties of both rice hush and husk ashes were analyzed by Scanning Electron Microscope (SEM).
International Journal of Engineering & Technology, 2018
Silica is widely available in nature including the ones in the form of crystal granule, gel and colloid. Silica is known to have a higher boiling point than other materials. The production of silica gel from rice husk ash has a characteristic in the amount of silicone level which depends on its heating time during extraction. This research aims at increasing production of silicone element in rice husk ash extraction method using kalium hydroxide (KOH), with heating time variation during its solution, namely between 15, 30, 45 and 60 minutes. With an observation using EDS, the relationship of heating time toward the silicone level on the resulted material can be discovered. The 15-minute heating time contains the highest silicone level compared to the 30, 45 or even 60-minute heating time.
Silica from rice husk through thermal decomposition
Thermochimica Acta, 1986
The thermal decomposition characteristics of rice husk have been investigated by dynamic thermoanalytical techniques: DTA, TG, DTG and isothermal heating. The observed thermal behaviour is explained on the basis of a superposition of the decomposition of cellulose and lignin, which are the major organic constituents of rice husk. Morphological features of silica in husk as well as the ash are examined by scanning electron microscopy. Silica in the residual ash has been characterised by X-ray diffraction and infrared spectroscopy. Controlled thermal decomposition of rice husk has been shown to be a convenient method for the liberation of silica. 0040-6031/86/$03.50 0 1986 Elsevier Science Publishers B.V.
Production of Silica from Rice husk
International Journal of ChemTech Research, 2014
Rice husk (RH) is an agricultural waste, which is easily available in the market and Silica (SiO2) is the most abundant material in the earth's crust. This paper addresses the production of silica from the rice husk. The Rice husk ash (RHA) is obtained by burning of rice husk in a muffle furnace at a temperature of 500, 600 and 700 0 C, which is bio-organic Silica (SiO2) and has high pozzolanic activity. The temperature and the time duration for the combustion process are optimized. X-ray Fluorescence (XRF) analysis is carried out to determine the chemical composition of rice husk and that of the rice husk ash. The formed rice husk ash is treated with Sodium hydroxide (NaOH) and Hydrochloric acid (HCl) to produce silica. The obtained silica is used for the various applications like automotive industry, cosmetic industry, etc. The compound of silica like Sodium silicate (NaSiO3) is used for water treatment, concrete treatment, cement production, etc. The brief explanation for the...
IOP Conference Series: Materials Science and Engineering, 2019
The effect of hydrochloric acid leaching on thermal decomposition process and morphology of the rice husk in silica production have been investigated. Amorphous silica can be obtained by thermal decomposition of rice husk in acid solution. The aim of this study is to investigate the stages of thermal decomposition of rice husk and its morphology. In this work, thermal decomposition of rice husk has been investigated in neutral and acid solution (hydrocloric acid 1%v/v, 3%v/v). The thermal decomposition study was performed at 225 o c, 450 o c, 700 o c. The thermal behavior were investigated using DSC while the microstructure and properties of rice husk were characterized by SEM, FTIR, XRD.The results showed that the pre-treatment of the rice husk with acid leaching accelerated thermal decomposition of organic components at slight lower temperature as showed by differential scanning calorimetry (DSC) and scanning electron microscope (SEM) analysis. This knowledge may provide better insight in order to obtain high grade amorphous silica.
Rice husk ash as an alternate source for active silica production
Materials Letters, 2002
The objective of the present work is to develop a procedure for obtaining and characterization active silica with a high specific surface area from rice husk ash. The relative amount of silica was increased after burning out the carbonaceous material at different times and temperatures. A 95% silica powder could be produced after heat-treating at 700 jC for 6 h. The specific surface area of particles was increased after wet milling from 54 to 81 m 2 /g. D
extraction of silica from rice husk
The paper describes the treatment of rice husk with acid and base, namely, hydrochloric acid and sodium hydroxide to yield precipitates of silica. As rice husk contains over 80-90% silica when converted to ash, it becomes important to extract it. A simple non-conventional method for extracting silica in the amorphous form is based on alkaline extraction followed by acid precipitation. Rice husk ash was prepared and washed with acid to remove the mineral impurities. Further, it was treated with sodium hydroxide to form sodium silicate solution. The silicate solution formed was titrated with hydrochloric acid and precipitation (in the form of gel) formation takes place below pH 10.
Jurnal Teknologi
In recent years, research on bio-based materials, such as rice husk is steadily gaining momentum. Despite their huge developmental potential, rice husks are often left unutilised following the harvesting season, wasting a natural wealth that could be explored. Their high silica content makes them potential fillers to replace commercial precipitated silica in the polymer industry, composites and building materials for construction. In this study, highly pure silica with small particle size and high surface area was extracted from rice husks via solvent-thermal treatment, followed by leaching with different concentrations of hydrochloric acid (HCl). This treatment method was modified from TAPPI T204 (2007) and TAPPI T264 (1997) standards, which are used for wood extraction in the pulp and papermaking industry. By using this method, rice husk silica (RHS) that was leached with 1.0 M HCl recorded the highest particle purity with 99.99% of SiO2 content and the highest BET surface area of...
Preparation of Silica Powder from Rice Husk
Rice husk is an agricultural residue abundantly available in India. A huge amount of rice husk is discharged in India, and the rice husk is usually burned in the field, or in some cases it is used as a fuel for power plant. In both cases, the smoke generated with the burning process often causes serious domestic and also international environmental problems. It is very important to solve the problems, smoke and waste, in relation to the treatment of rice husk. Rice husk is one of the most silica rich raw materials containing about 90-98% silica. Rice husk large ash content and sodium silicate content in the ash it becomes economical to extract silica from the rice husk ash, which has wide market and also takes care of ash disposal. Rice husk is a popular boiler fuel and the ash generated usually creates disposal problems. The chemical process discussed not only provides a solution for waste disposal but also recovers a valuable silica product, together with certain useful associate recoveries. The sample characterized by FTIR & X-ray diffraction (XRD).
Silica Gel, a value added product production from Rice Husk Ash
Journal of emerging technologies and innovative research, 2018
The present study deals with the production of Silica Gel from Rice Husk Ash. Different mills of Bundi district of Rajasthan were visited to know about the production and utilization of Rice Husk and Rice Husk Ash produced. Rice Husk Ash from different sources was chemically treated and the extracted amounts of Silica Gel were compared. It was found that Rice Husk Ash contains 70.90 percent to 84.50 percent Silica Gel. This suggests that Rice Husk, which is considered as waste product from the Rice Mills and sold at Rs. 300 per quintal, can be used for production of value added product such as Silica which has its commercial sale value of Rs. 200 per Kg. Introduction Rice is one of the staple foods of India. In Rajasthan, rice is mainly grown under the highly rain-fed areas like Kota and Bundi districts. It is estimated that 0.23 tons of rice husk is produced from every ton of rice produced. These mills use 70 percent of the Rice husk produced as a fuel in boiler. Burning rice husk ...