Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies

A number of studies have investigated the impact of alkali cations on quartz dissolution to increase the understanding of natural rock weathering and enhance the predictability of silica behaviour in reservoir systems. However, there are few evidences for how alkali cations approach the quartz surfa...

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Main Authors: Ali, A.M., Padmanabhan, E., Baioumy, H.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19476 /
Published: Springer Verlag 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019773151&doi=10.1007%2fs13369-017-2483-5&partnerID=40&md5=8d0903ef23121f9913e2e7e27ea05834
http://eprints.utp.edu.my/19476/
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spelling utp-eprints.194762018-04-20T05:59:54Z Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies Ali, A.M. Padmanabhan, E. Baioumy, H. A number of studies have investigated the impact of alkali cations on quartz dissolution to increase the understanding of natural rock weathering and enhance the predictability of silica behaviour in reservoir systems. However, there are few evidences for how alkali cations approach the quartz surface. Thus, this study is an attempt to provide empirical evidence on the interaction of electrolytes (Na +, K +, Ca 2 +) with quartz surface. Bulk quartz grains and clean-faced single quartz crystals were dissolved/etched in varying pH solutions of acidic, near-neutral/neutral and alkali solutions (KOH, NaOH, KCl, NaCl, CaCl 2, CH 3COOH , HCl). The amount of dissolved silica was measured with molybdate spectrophotometry method, while variations in quartz surface morphology were studied using scanning electron microscopy attached with EDX. Quartz dissolution rates varied with pH, hydrated radius and hydrolysis constants of alkali cations in the order: Ca 2 +< Na +< K +. Relatively deeper triangular etch pits were observed in quartz dissolved in KOH and NaOH solutions, while shallower pits formed in neutral solutions, and exsolution faces and lamellae were formed in quartz dissolved in low-pH solutions. The results also showed that interfacial secondary phases of cationic silicates play a key role in quartz dissolution. © 2017, King Fahd University of Petroleum & Minerals. Springer Verlag 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019773151&doi=10.1007%2fs13369-017-2483-5&partnerID=40&md5=8d0903ef23121f9913e2e7e27ea05834 Ali, A.M. and Padmanabhan, E. and Baioumy, H. (2017) Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies. Arabian Journal for Science and Engineering, 42 (6). pp. 2501-2513. http://eprints.utp.edu.my/19476/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description A number of studies have investigated the impact of alkali cations on quartz dissolution to increase the understanding of natural rock weathering and enhance the predictability of silica behaviour in reservoir systems. However, there are few evidences for how alkali cations approach the quartz surface. Thus, this study is an attempt to provide empirical evidence on the interaction of electrolytes (Na +, K +, Ca 2 +) with quartz surface. Bulk quartz grains and clean-faced single quartz crystals were dissolved/etched in varying pH solutions of acidic, near-neutral/neutral and alkali solutions (KOH, NaOH, KCl, NaCl, CaCl 2, CH 3COOH , HCl). The amount of dissolved silica was measured with molybdate spectrophotometry method, while variations in quartz surface morphology were studied using scanning electron microscopy attached with EDX. Quartz dissolution rates varied with pH, hydrated radius and hydrolysis constants of alkali cations in the order: Ca 2 +< Na +< K +. Relatively deeper triangular etch pits were observed in quartz dissolved in KOH and NaOH solutions, while shallower pits formed in neutral solutions, and exsolution faces and lamellae were formed in quartz dissolved in low-pH solutions. The results also showed that interfacial secondary phases of cationic silicates play a key role in quartz dissolution. © 2017, King Fahd University of Petroleum & Minerals.
format Article
author Ali, A.M.
Padmanabhan, E.
Baioumy, H.
spellingShingle Ali, A.M.
Padmanabhan, E.
Baioumy, H.
Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
author_sort Ali, A.M.
title Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
title_short Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
title_full Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
title_fullStr Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
title_full_unstemmed Characterization of Alkali-Induced Quartz Dissolution Rates and Morphologies
title_sort characterization of alkali-induced quartz dissolution rates and morphologies
publisher Springer Verlag
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85019773151&doi=10.1007%2fs13369-017-2483-5&partnerID=40&md5=8d0903ef23121f9913e2e7e27ea05834
http://eprints.utp.edu.my/19476/
_version_ 1741196212756807680
score 11.62408

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