Rice husk ash (RHA) as cement admixture for immobilization of liquid radioactive waste at different temperatures

2008 ◽  
Vol 381 (3) ◽  
pp. 271-277 ◽  
Author(s):  
A. El-Dakroury ◽  
M.S. Gasser
Keyword(s):  
Radioactive Waste ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Liquid Radioactive Waste ◽  
Different Temperatures

scholarly journals Adsorption Studies of Cyanide (CN)- on Rice Husk Ash (RHA)

2011 ◽  
Vol 46 (1) ◽  
pp. 101-104 ◽  
Author(s):  
S Naeem ◽  
U Zafar ◽  
T Amann
Keyword(s):  
Rice Husk ◽  
Contact Time ◽  
Rice Husk Ash ◽  
Cyanide Solution ◽  
Adsorption System ◽  
Solution System ◽  
Adsorbate Concentration ◽  
Adsorption Data ◽  
Batch Technique ◽  
Different Temperatures

In this investigation, adsorption of cyanide has been studied by means of batch-technique. Percentage adsorption was determined for Rice Husk Ash (RHA)-Cyanide solution system as a function of i) contact time, ii) pH, iii) adsorbate concentration and iv) temperature. Adsorption data has been interpreted in terms of Freundlich and Langmuir equations. Thermodynamics parameters for the adsorption system have been determined at three different temperatures. The value of ΔH°=38.326KJ/mole and ΔG°=-6.117KJ/mole at 283°K suggest that the adsorption of cyanide on RHA is an endothermic and a spontaneous process.Key words: Cyanide; Rice husk ash (RHA); Adsorption Isotherms DOI: http://dx.doi.org/10.3329/bjsir.v46i1.3524 Bangladesh J. Sci. Ind. Res. 46(1), 101-104, 2011

ICONE19-44191 INFLUENCE OF GRAIN SIZE VARIATION OF RICE HUSK ASH AND CEMENT WATER PHASE ON RADIOACTIVE WASTE CEMENTATION

2011 ◽  
Vol 2011.19 (0) ◽  
pp. _ICONE1944-_ICONE1944
Author(s):  
Saiful Arif Nugroho ◽  
Hayu Tyas Utami ◽  
Hanung Budi Prihantoro ◽  
Susetyo Hario Putero
Keyword(s):  
Grain Size ◽  
Radioactive Waste ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Size Variation ◽  
Water Phase

FTIR and TGA Analysis in Relation with the % Crystallinity of the SiO2 Obtained by Burning Rice Husk at Various Temperatures

2012 ◽  
Vol 585 ◽  
pp. 77-81 ◽  
Author(s):  
Pallavi Deshmukh ◽  
Dilip Peshwe ◽  
Shailkumar Pathak
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Waste Product ◽  
Industrial Applications ◽  
Amorphous Sio2 ◽  
Nano Sio2 ◽  
Different Temperatures ◽  
Cheap Alternative ◽  
Length Width ◽  
Tga Analysis

Rice husk ash (RHA), a waste product of the rice industry, is rich in SiO2. The large amount of SiO2 freely obtained from it provides an abundant and cheap alternative to metallurgical grade SiO2 for many industrial applications. The detailed analysis of the physical dimensions such as length, width and thickness of four varieties (HMT, Sonam, 1001 and JSR) was done. The FTIR analysis of the ash obtained by burning rice husk at different temperatures proves the formation of nano SiO2. The study of the isothermal thermal degradation of the RHA was done by TGA analysis .During TGA analysis it was observed that, mass trace suddenly goes backwards along the abscissa and then continues forward normally. This characteristic behavior of the TGA plot was attributed to the formation of nano SiO2 during incineration of the RHA. The minimum value of the percentage crystallinity of the SiO2 at 500°C proved the formation of amorphous SiO2.

Properties of Mortar Containing Rice Husk Ash at Different Temperature and Exposed to Aggressive Environment

2012 ◽  
Vol 620 ◽  
pp. 87-93 ◽  
Author(s):  
Ramadhansyah Putra Jaya ◽  
Mohd Al Amin Muhamad Nor ◽  
Zainal Arifin Ahmad ◽  
Zakaria Mohd Amin
Keyword(s):  
Compressive Strength ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
X Ray Diffraction ◽  
X Ray ◽  
Compressive Strength Test ◽  
Binder Ratio ◽  
Different Temperatures ◽  
Good Potential ◽  
Water To Binder Ratio

The properties of mortar containing rice husk ash at varying temperatures were studied. Three rice husk ash samples were prepared at different temperatures and with various colors, i.e., 600°C (pink), 800°C (grey), and 1000°C (white), all were used for this study. Ordinary Portland cement (OPC), a well known universal binder, was partially replaced with rice husk ash at 10, 15, 20, and 30% by weight of binder. The water to binder ratio (W/B) of the mortar was kept constant at 0.45. The mortars were subjected to seawater or saturated Ca (OH)2 solution. The controlled and exposed mortars were characterized using X-ray diffraction, FTIR spectroscopy and compressive strength test. The results show that the amount of silica present in RHA are varied with burning temperature and colors, approximately in the range of 95 to 97%. White RHA produced higher compressive strength both in seawater and Ca (OH)2 solution. Finally, white RHA with 15% replacement was most suitable to be used as additive in OPC, and showed good potential for use in seawater applications and alkaline environment.

scholarly journals Development of an Amorphous Silica from Rice Husk Waste

2017 ◽  
Vol 7 (6) ◽  
pp. 2184-2188
Author(s):  
D. K. Bangwar ◽  
A. Saand ◽  
M. A. Keerio ◽  
M. A. Soomro ◽  
N. Bhatti
Keyword(s):  
Rice Husk ◽  
Amorphous Silica ◽  
Rice Husk Ash ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Amorphous Sio2 ◽  
Pozzolanic Material ◽  
Optimum Proportion ◽  
Different Temperatures ◽  
Crystalline Nature

This article presents a study on the development of amorphous silica from Rice Husk (RH) waste. For ascertaining the optimum proportion of temperature and burning duration required for the development of an amorphous silica from RH waste, different Rice Husk Ash (RHA) samples, i.e. RHA (500oC-1.5hr), RHA (500oC-2hr), RHA (600oC-1.5hr), RHA (600oC-2hr), RHA (700oC-1.5hr), RHA (700oC-2hr), RHA (800oC-1.5hr), RHA (800oC-2) and RHA (900oC-1hr) were extracted by burning the husk at different temperatures and durations. Energy Dispersive Spectrometry (EDS) analysis was carried out for ascertaining the existence of main and insignificant elements in the RHAs samples and it was noticed that the extracting of silicon dioxide (SiO2) was exclusively dependent on the temperature and burning duration. After EDS, X-ray Diffraction (XRD) analysis was used to find out the crystalline and non-crystalline nature of obtained silica at different temperatures and burning durations. Through EDS and XRD, it has been found that that the extracted Rice Husk Ash at the temperature of 800oC for 2hr is rich in amorphous SiO2 content, i.e. 91.74% which meets the requirements of ASTM 618-03 for a pozzolanic material.

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.

Desalination Technology of Water by using Rice Husk Ash

2014 ◽  
Vol 27 (2) ◽  
pp. 148-160
Author(s):  
Hassan K. Hassan ◽  
Najla J. Al-Amiri ◽  
Mohammed M. Yassen
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Desalination Technology
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