FIBER CONTENT, PARTICLE-SIZE DISTRIBUTION AND SOME RELATED PROPERTIES OF FOUR PEAT MATERIALS IN EASTERN CANADA

1977 ◽  
Vol 57 (2) ◽  
pp. 187-195 ◽  
Author(s):  
M. LEVESQUE ◽  
H. DINEL
Keyword(s):  
Particle Size ◽  
Size Fraction ◽  
Chemical Characterization ◽  
Particle Size Analysis ◽  
Exchange Capacity ◽  
Fiber Content ◽  
Size Analysis ◽  
Eastern Canada ◽  
Effective Dispersion

The effects of dispersion and sieving on the determination of fiber content was studied using four peat materials selected for their range of properties. In addition, a method of particle-size analysis of peat materials and chemical characterization data of the particular-size fraction are presented. Controlling the sieving operation effected a reduction in the coefficient of variation of the fiber content data to 2.7% as compared with 26.7% for the conventional rubbed fiber method. The somewhat more effective dispersion of the peat in 0.025 M pyrophosphate than in water did not compensate for the associated disadvantage of increased ash content of the pyrophosphate-treated samples. Thus, the recommended procedure involves dispersion of peat in water for 16 h. The proportion of the 100-mesh (0.15-mm) fraction reflected both the stage of decomposition and the botanical origin of the peat materials. Thus, particle-size fraction would be useful in the characterization of peat materials. Cation exchange capacity and content of both Fe and P varied inversely with particle size.

scholarly journals Mining Wastes of an Albite Deposit as Raw Materials for Vitrified Mullite Ceramics

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 232
Author(s):  
Pedro J. Sánchez-Soto ◽  
Eduardo Garzón ◽  
Luis Pérez-Villarejo ◽  
George N. Angelopoulos ◽  
Dolores Eliche-Quesada
Keyword(s):  
Particle Size ◽  
Raw Materials ◽  
Phase Evolution ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Mining Wastes ◽  
X Ray Diffraction ◽  
X Ray ◽  
Maximum Value

In this work, an examination of mining wastes of an albite deposit in south Spain was carried out using X-ray Fluorescence (XRF), X-ray diffraction (XRD), particle size analysis, thermo-dilatometry and Differential Thermal Analysis (DTA) and Thermogravimetric (TG) analysis, followed by the determination of the main ceramic properties. The albite content in two selected samples was high (65–40 wt. %), accompanied by quartz (25–40 wt. %) and other minor minerals identified by XRD, mainly kaolinite, in agreement with the high content of silica and alumina determined by XRF. The content of Na2O was in the range 5.44–3.09 wt. %, being associated with albite. The iron content was very low (<0.75 wt. %). The kaolinite content in the waste was estimated from ~8 to 32 wt. %. The particle size analysis indicated values of 11–31 wt. % of particles <63 µm. The ceramic properties of fired samples (1000–1350 °C) showed progressive shrinkage by the thermal effect, with water absorption and open porosity almost at zero at 1200–1250 °C. At 1200 °C, the bulk density reached a maximum value of 2.38 g/cm3. An abrupt change in the phase evolution by XRD was found from 1150 to 1200 °C, with the disappearance of albite by melting in accordance with the predictions of the phase diagram SiO2-Al2O3-Na2O and the system albite-quartz. These fired materials contained as main crystalline phases quartz and mullite. Quartz was present in the raw samples and mullite was formed by decomposition of kaolinite. The observation of mullite forming needle-shape crystals was revealed by Scanning Electron Microscopy (SEM). The formation of fully densified and vitrified mullite materials by firing treatments was demonstrated.

scholarly journals Application of Particle-Size Analysis Data for the Determination of Air/Cleaner Performance

1965 ◽  
Author(s):  
Lawrence J. Czerwonka ◽  
Jack M. Carey
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Analysis Data ◽  
Particle Size Analysis ◽  
General Purpose ◽  
Size Analysis ◽  
Air Filter ◽  
Performance Curves ◽  
Air Cleaner

A general purpose centrifuge method for measuring particle-size distribution of air-filter inlet, outlet and catch dust samples is demonstrated. Treatment and analysis of data to determine air-cleaner performance based on size distribution is shown for two types of air filters, a louver and a glass-fiber media filter. The advantages and limitations of the method and interpretations of results associated with the application of these procedures for arriving at efficiency versus particle-size performance curves, and for predicting filter efficiency for any given dust are discussed.

Particle Size Study of Smectite Clays from the City of Pedra Lavrada-PB

2014 ◽  
Vol 775-776 ◽  
pp. 377-382
Author(s):  
Mirtys Allamana Ferreira Cardoso ◽  
Alexsandra Cristina Chaves ◽  
M.M. Dantas ◽  
Isabelle Albuquerque da Silva ◽  
I.D.S. Pereira ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Drilling Fluids ◽  
Particle Sizes ◽  
Smectite Clays ◽  
Significant Difference ◽  
Water Based ◽  
The City

The state of Paraíba disposes of one of the largest deposits of smectites in the country. However, these smectites present in their composition elevated contents of accessory minerals, especially quartz. For these clays to become viable to determine technological use it is necessary the elimination of part of these minerals. The particle size analysis of a soil consists in the determination of the size of the particles that constitute it and their distribution in certain intervals. This work aims to study smectite clays from the city of Pedra Lavrada-PB, through the particle size analyses, for the use in water based drilling fluids. The determination of particle size was made by sieving and laser granulometer. Apparent and plastic viscosities were measured from the samples. The clays were left at rest before the test for periods of 7 and 28 days, with and without deflocculant. It was verified that there was no significant difference in the particle sizes in relation to the resting time of the samples.

Size characteristics of soils and sediments with special reference to clay fractions

Soil Research ◽  
1979 ◽  
Vol 17 (3) ◽  
pp. 383 ◽  
Author(s):  
PH Walker ◽  
J Hutka
Keyword(s):  
Particle Size ◽  
Size Fraction ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Size Fractions ◽  
Soils And Sediments ◽  
Eastern Australia ◽  
Fine Clay ◽  
Lake Floor ◽  
Log Normal

Soils and sediments from south-eastern Australia were examined to determine whether texture B horizons had distinctive and unique particle-size characteristics. Most texture B horizons had higher contents of fine clay (<0.2 �m) than coarse clay (0.2-2 �m), whereas coarse clay was the dominant clay-size fraction in A and C horizons. Sequences of soils in alluvium showed a systematic increase in particle-size differentiation with increasing stratigraphic age and corresponding increases in the proportion of fine clay in their B horizons. Pedologically unmodified, clay-rich sediments generally had lower contents of fine clay and higher contents of silt than B horizons. However, sediments of a lake floor and samples of argillans had clay-size fractions similar to B horizons. The distribution of fine clay in soils, determined here by centrifugal sedimentation, was poorly related to illuviated clay determined microscopically. Detailed particle-size data showed that texture B horizons were more enriched than adjacent horizons by a fraction with upper size limits between 0.25 and 0.5 �m. The greater the profile texture contrast, the more pronounced this enrichment became. The enriched clay-size fractions of these B horizons had the particle-size characteristics of log normal distributions. Within the clay-size range of texture B horizons, the fraction < 0.5 �m was the most directly related to surface area measurements made on dry soil samples. Sediments of a lake floor and samples of argillans had similar clay-size characteristics to soil B horizons. It was concluded that particle-size differentiation in these soils was related mainly to pedogenetic processes within the profile. However, the particle-size characteristics of texture B horizons are not unique. Criteria other than those based on particle-size analysis are therefore required to determine the relative importance of translocation and weathering.

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