Study on Preparation of Mullite Powder Using Fly Ash by Mechanochemical Method

2013 ◽  
Vol 318 ◽  
pp. 326-330
Author(s):  
Lei Zhang ◽  
Qun Yu Chen ◽  
Ding Gao
Keyword(s):  
Fly Ash ◽  
Ball Mill ◽  
Structural Changes ◽  
Planetary Ball Mill ◽  
Mechanochemical Method ◽  
Signal Phase ◽  
Direct Formation ◽  
Ft Ir ◽  
Mullite Powder ◽  
Grinding Time

This paper studies the structural changes of the mixture of fly ash and A12O3 grinded by planetary ball mill . By investigating the structure of the ground product by SEM, XRD and FT-IR, the mechanism of mullite formation is discussed. The crystal structure of the mixture was destroyed by the grinding of planetary ball mill, and with the grinding time increases, the specific surface area of the mixture increases as well. And this leads to the decrease of bond energy, the increase of the internal energy and the decrease of the activation energy. After this process,uniform mixture and direct formation of signal phase mullite can be obtained from the mixture grinded for 30 hours and calcined at 1150°C for 2 hours and the temperature for mixture ungrinded needs to reach 1450°C.

scholarly journals Intrinsic resistivity of sintered Nickel Manganite vs. powder activation time and density

2008 ◽  
Vol 40 (1) ◽  
pp. 27-32
Author(s):  
S.M. Savic ◽  
M.V. Nikolic ◽  
O.S. Aleksic ◽  
M. Slankamenac ◽  
M. Zivanov ◽  
...  
Keyword(s):  
Ball Mill ◽  
Structural Changes ◽  
Sintering Temperature ◽  
Planetary Ball Mill ◽  
Dc Resistivity ◽  
Activation Time ◽  
Sample Density ◽  
Ntc Thermistor ◽  
Different Temperatures ◽  
Thermistor Material

In this work the DC resistivity of sintered nickel manganite NiMn2O4 (NTC thermistor material) was studied as a function of additional powder activation time in a planetary ball mill (0, 5, 15, 30, 45 and 60 min). The activated powders and non-activated powder were sintered at different temperatures (900, 1050 and 12000C) for an hour. Structural changes were analyzed using XRD. Sample density, porosity and DC resistivity were measured on the same sintered samples. Correlations between sample density, porosity, and intrinsic DC resistivity vs. additional powder activation time and the sintering temperature were made. It was noticed that the resistivity falls with the increase of sample density (or increase of the sintering temperature).

The effect of different fineness values of Afşin Elbistan fly ash on permeability in concrete

2020 ◽  
Vol 6 (2) ◽  
pp. 73
Author(s):  
Demet Demir Şahin ◽  
Mustafa Çullu ◽  
Hasan Eker
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Ball Mill ◽  
Thermal Power ◽  
Concrete Composition ◽  
Cement Production ◽  
Plant Waste ◽  
Mineral Additive ◽  
Grinding Time

Too much CO2 is released during cement production. In many researches, the use of natural or recycled compounds plays an important role in the cement composition. The use of these components contributes both to reducing the amount of waste and to protecting the environment in nature. It is possible to produce an environmentally friendly concrete, thanks to its being a fly ash thermal power plant waste and its use as mineral additive in terms of its composition. In this study, it is aimed to produce impermeable concretes with the use of C type fly ash as substitutes for cement in concrete composition in substitution rates of 10 %, 30 % and 50 %. In order to reduce the permeability of concrete in this direction, as a result of grinding the fly ash in the ball mill for 0, 10, 20, 30, 45 and 60 minutes, concrete samples were prepared with and without admixture (Reference). Capillarity test was performed to determine the permeability at the end of cure periods of 28 and 90 days on concrete samples. According to the results obtained at the end of 28 days, the best impermeability was achieved in the mixture with 50 % fly ash replacement and 60 minutes grinding time. In 90 days, the best impermeability was obtained in the mixture with 30 % fly ash replacement and 0 minutes of grinding time. As a result, it was seen that permeability decreased with increasing thinness and substitution rate of fly ash in concrete composition.

Physical and Thermal Properties of Zingiber officinale Rosc. (Ginger) Rhizome Fine Particle as a Function of Grinding System

2013 ◽  
Vol 832 ◽  
pp. 527-532 ◽  
Author(s):  
A. Norhidayah ◽  
A. Noriham ◽  
Mohamad Rusop
Keyword(s):  
Thermal Properties ◽  
Ball Mill ◽  
Zingiber Officinale ◽  
Milling Process ◽  
Planetary Ball Mill ◽  
Hammer Mill ◽  
Food Processor ◽  
Ginger Rhizome ◽  
Stretching Vibration ◽  
Ft Ir

In this study,Zingiber officinale(ginger) rhizome fine particles were prepared by using food processor, hammer mill and planetary ball mill and tested for their physical and thermal properties. The physical changes by means of particle size, surface morphology, FT-IR and thermal stability (TGA) were investigated. The size reduction method had a distinct effect on physical and thermal properties of ginger rhizome tested. Average particle size of ginger rhizome after using food processor and hammer mill was around 50µm and 20µm respectively while after using planetary ball mill the ginger rhizome was successfully reduced to nanoscale (222.3 nm). Higher degree of granule surface fractured was observed as a result of a planetary ball milling process based on FESEM images. There were also some notable differences of FT-IR spectra detected. By comparing the spectra, the stretching vibration peak of OH at 3292 cm-1[U1]and the symmetric stretching vibration peak of the NO2and C=C at 1369 – 1639.51cm-1 for ginger rhizome ground using food processor were disappeared. Yet, presence of possibly strong alkenes group (in the range 2850 – 2970cm-1) were observed in all samples tested. Ginger rhizome particles obtained from hammer milling process were found to be more stable to thermal effect where the decomposed temperature was 276.64°C as compared to samples milling using food processor and planetary ball mill. These results would provide useful insight for exploring the potential applications of ginger rhizome fine powder as functional food ingredient as well as in pharmaceutical applications. [U1]Check typing of superscript.

Mechanical Activation of Fly Ash by High Energy Planetary Ball Mill and the Effects on Physical and Morphology Properties

2014 ◽  
Vol 625 ◽  
pp. 38-41
Author(s):  
Rashidah Mohammed Hamidi ◽  
Zakaria Man ◽  
Khairun Azizi Azizli ◽  
Lukman Ismail ◽  
Mohd Fadhil Nuruddin
Keyword(s):  
Particle Size ◽  
Fly Ash ◽  
Mechanical Activation ◽  
Ball Mill ◽  
Low Cost ◽  
Specific Area ◽  
High Energy ◽  
Raw Material ◽  
Planetary Ball Mill ◽  
Particle Size Analyzer

Fly ash has a high potential to be converted into geopolymeric material due to its abundant supplies and low cost. However, large particle size of the fly ash caused low reactivity which results in low properties of the end product. The improvement on the fly ash properties by mechanical activation allows it as a new possible raw material in wider application besides solving the low reactivity issue which hindered its range of utilization. In this study, fly ash was mechanically activated by high energy planetary ball mill for 1 hour at different speed, ranging from 100 to 350 rpm and with varied ball to powder ratio (2:1, 3:1 and 4:1). The effects towards its particle size, specific surface area and morphology were determined by particle size analyzer and SEM. It was observed that, increasing of speed to 350 rpm and 4:1 ball to powder ratio (BPR) results in finest size of fly ash where at d (0.1), d (0.5) and d (0.9) the sizes were 1.861, 6.765 and 17.065μm respectively and largest surface specific area (1.46 m2/g).

scholarly journals CO2 Utilization For Mechanochemical Carbonation Of Celestine

2015 ◽  
Vol 61 (3) ◽  
pp. 20-23 ◽  
Author(s):  
Erika Turianicova
Keyword(s):  
Infrared Spectroscopy ◽  
Ball Mill ◽  
High Energy ◽  
Planetary Ball Mill ◽  
Co2 Utilization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Characterization Techniques ◽  
One Step ◽  
Ft Ir

Abstract Natural celestine (SrSO4) has been succesfully transformed into strontianite (SrCO3) via fast one-step mechanochemical carbonation utilizing gaseous CO2. The process was realized in the environment enriched with LiOH or NaOH additives. The mixtures were milled in a high-energy planetary ball mill for 40 min. The phases formed during the milling were characterized by different characterization techniques, such as X-ray diffraction (XRD) and infrared spectroscopy (FT-IR). The presence or absence of carbon or sulphur in the products was confirmed by a CHNS analysis.

scholarly journals Intrinsic resistivity of sintered Nickel Manganite vs. powder activation time and density

2008 ◽  
Vol 40 (1) ◽  
pp. 27-32 ◽  
Author(s):  
S.M. Savic ◽  
M.V. Nikolic ◽  
O.S. Aleksic ◽  
M. Slankamenac ◽  
M. Zivanov ◽  
...  
Keyword(s):  
Ball Mill ◽  
Structural Changes ◽  
Sintering Temperature ◽  
Planetary Ball Mill ◽  
Dc Resistivity ◽  
Activation Time ◽  
Sample Density ◽  
Ntc Thermistor ◽  
Different Temperatures ◽  
Thermistor Material

In this work the DC resistivity of sintered nickel manganite NiMn2O4 (NTC thermistor material) was studied as a function of additional powder activation time in a planetary ball mill (0, 5, 15, 30, 45 and 60 min). The activated powders and non-activated powder were sintered at different temperatures (900, 1050 and 12000C) for an hour. Structural changes were analyzed using XRD. Sample density, porosity and DC resistivity were measured on the same sintered samples. Correlations between sample density, porosity, and intrinsic DC resistivity vs. additional powder activation time and the sintering temperature were made. It was noticed that the resistivity falls with the increase of sample density (or increase of the sintering temperature).

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