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King Fahd University of Petroleum and Minerals. (KFUPM) 2022

Evaluating properties of Arabian desert sands for geological and energy applications.

RADWAN OMAR ATEF

Titre : Evaluating properties of Arabian desert sands for geological and energy applications.

Auteur : RADWAN OMAR ATEF

Université de soutenance : King Fahd University of Petroleum and Minerals. (KFUPM)

Grade : Doctor of Philosophy (PhD) 2022

Résumé
Sands cover one third of Arabian Peninsula and represent the largest continuous body of eolian sand on Earth. This study aims to investigate quartz crystallinity of Arabian sands and sandstones to help reveal new provenance aspects. It also investigates mineralogy, thermo-physical, and thermo-optical properties of Arabian sands to help find the best candidate of Arabian sands to be employed as a thermal energy storage medium and solar absorber material for high-temperature solar thermal technologies. Systematic sampling covered Quaternary surface sediments from Nafud, Dahna corridor, and the western part of AlRub’AlKhali deserts, and Paleozoic and Mesozoic sandstones. Quartz crystallinity index (QCI) values of sandstones were found to vary temporally and seem to be associated with geologic abundances of siliceous sponges and eolian depositional environments. QCI values of sands vary spatially and are narrower (homogenized) after unidirectional and/or long-distance transportation in AlRub’AlKhali sands. The presence of chert is suggested to be responsible for the extreme values of QCI in Arabian sands and sandstones. The purest quartzose sands (≥99% quartz) possess the best thermo-physical and thermo-optical properties. These pure quartzose sands have the highest specific heat capacity, do not agglomerate up to 1200°C, and have the highest spectral absorbance after heating to 1200°C. The purest quartzose sands occupy the southwestern part of the Nafud desert. Sand of this area is proposed to be the best candidate of all Arabian sands to be used as a sensible thermal energy storage medium and solar absorber material.

Présentation

Page publiée le 14 décembre 2022