Physical, Chemical, and Mineralogical Characteristics of Soils from Volcanic Ash in Northern Idaho: II. Phosphorus Sorption

AbstractThe Maastrichtian-Palaeogene series of the Western High Atlas and Meseta Basins in Morocco are particularly rich in palygorskite. The present work is aimed at clarifying the genesis of palygorskite from the interbedded facies and gaining an understanding of their relationships with the depositional environment. The mineralogical characteristics of palygorskite from these series were studied by X-ray diffraction (XRD) and electron microscopy (SEM/TEM). The palygorskite content and microstructure show large geographical and stratigraphical variations in the deposits studied. The palygorskite occurrence is directly related to palaeobathymetry, since it is the dominant clay mineral in shallow marine and restricted environments. According to the morphology of palygorskite crystallites, four types of textures were distinguished. These types of palygorskite are polygenetic, formed by chemical precipitation, by the recrystallization of smectite clays or reworked by wind or water from sub-aerial environments. The difference between the two studied sub-basins with respect to palygorskite occurrence is attributed to the palaeomorphology of the hinterlands, to the tectonic differentiation and to the physical-chemical conditions of seawater.

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Susceptibility of volcanic ash-influenced soil in northern Idaho to mechanical compaction /

10.5962/bhl.title.81812 ◽

1993 ◽

Cited By ~ 3

Author(s):

Deborah S. Page-Dumroese ◽

◽

Keyword(s):

Volcanic Ash ◽

Mechanical Compaction ◽

Northern Idaho

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The Effect of the Calcination Temperature on the Physical, Chemical and Mineralogical Characteristics of Sugar Cane Bagasse Ash (SCBA) for Use As Pozzolan

The Journal of Solid Waste Technology and Management ◽

10.5276/jswtm/2021.546 ◽

2021 ◽

Vol 47 (3) ◽

pp. 546-556

Author(s):

Tiago Assunção Santos ◽

Raquel Arraes Argolo ◽

Daniel Véras Ribeiro

Keyword(s):

Calcination Temperature ◽

Sugar Cane ◽

Sugar Cane Bagasse ◽

Pozzolanic Activity ◽

Infrared Spectrometry ◽

X Ray ◽

Physical Chemical ◽

Mineralogical Characteristics ◽

Washing Process ◽

Sugar Cane Bagasse Ash

Statement of Novelty: This study analyzes the influence of the washing process and the calcination temperature on the morphological, physical, chemical and mineralogical characteristics of SCBA. The objective of the present study is to evaluate the morphological, physical, chemical and mineralogical characteristics of sugar cane bagasse ash (SCBA). The ashes were obtained by calcination of sugarcane bagasse (SCB), a waste product generated by the sugar and alcohol industry, at temperatures of 500°C, 600° C and 700°C, and the influence of this calcination on the pozzolanic activity of SCBA. The techniques used to characterize these ashes include helium gas picnometry, sedigraphy, scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffractometry (XRD) and Fourier transform infrared spectrometry (FTIR). The evaluation of the pozzolanicity of these ashes was carried according to chemical titration method as proposed by Fratini, modified Chapelle method and finally using the pozzolanic activity index (PAI) with cement. The results showed that the SCBA presented high pozzolanicity, regardless of the calcination temperature.

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