Publication
Preliminary study of quartz gravel and veins occurring in the Equimina region, Benguela (Angola): potential uses in industry
| dc.contributor.author | Lisboa, Jose | |
| dc.contributor.author | Pereira, L. F. | |
| dc.contributor.author | Osório, A. | |
| dc.contributor.author | Rodrigues, José Feliciano | |
| dc.contributor.author | Fernández, J. | |
| dc.contributor.author | Oliveira, Álvaro | |
| dc.contributor.author | Manuel, José | |
| dc.date.accessioned | 2025-01-24T15:10:22Z | |
| dc.date.available | 2025-01-24T15:10:22Z | |
| dc.date.issued | 2024-07 | |
| dc.description.abstract | ABSTRACT: Vast occurrences of quartz in veins and extensive gravel beds in the coastal area of Equimina, approximately 100 km south of Benguela, constitute the object of this study, aiming for its industrial use. These occurrences are related to Paleoproterozoic gneisses and migmatites on which they outcrop. The veins are quite dismantled on the surface, and show a pronounced strike scattering, but the NE-SW orientation prevails. Some veins are pegmatitic (feldspar, quartz, and mica), others, if not the majority to the East in the study area, have a strong predominance of milky quartz with low content of other minerals. Except for a superficial and removable patina of iron oxides that often coats the quartz, it is free of visible impurities. Chemical analysis confirms high purity (SiO2 > 99.5%) and very low content of penalizing oxides. Although the composition of quartz is suitable for use in the ceramic and glass industry, due to the ways it occurs, the main potential of this abundant resource in the studied area is for the refractory and metallurgy industry. Besides the chemical composition, the size of the gravel mostly meets the dimensional requirements for silicon metal production, needing minimal beneficiation. | pt_PT |
| dc.description.abstract | RESUMEN: Grandes yacimientos de vetas de cuarzo y extensos lechos de grava en el litoral de Equimina, aproximadamente a 100 kilómetros al sur de Benguela, constituyen el objeto de este estudio, con vistas a su uso industrial. Estos indicios afloran entre gneises y migmatitas paleoproterozoicos. Las vetas de cuarzo están bastante desmanteladas superficialmente y muestran una pronunciada dispersión del rumbo, pero prevalece la orientación NE-SW. Algunas vetas son pegmatíticas (feldespato, cuarzo y mica), otras, si no la mayoría hacia el Este del área estudiada, tienen un fuerte predominio de cuarzo lechoso con bajo contenido de otros minerales. Excepto por una pátina superficial y removible de óxidos de hierro que a menudo recubre el cuarzo, está libre de impurezas visibles. Los análisis químicos confirman una alta pureza (SiO2 > 99,5%) y un contenido muy bajo de óxidos penalizadores. Si bien la composición del cuarzo es adecuada para su uso en la industria cerámica y del vidrio, por la forma en que se presenta, el principal potencial de este recurso es para la industria refractaria y metalúrgica. Además de la composición química, el tamaño de la grava cumple mayormente con los requisitos dimensionales para la producción de silicio metálico, necesitando un procesamiento mínimo. | pt_PT |
| dc.description.version | N/A | pt_PT |
| dc.identifier.citation | Lisboa, J.V., Pereira, L.F., Osório, A., Rodrigues, J.F., Fernandez, J., Oliveira, A. & Manuel, J. (2024) Preliminary study of quartz gravel and veins occurring in the Equimina region, Benguela (Angola): potential uses in industry. In: Geo-Temas, vol. 20, XI Congresso Geológico de España, Ávila, España, 2-6 July, 2024, p. 1339-1342 | pt_PT |
| dc.identifier.uri | http://hdl.handle.net/10400.9/4457 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | no | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | pt_PT |
| dc.subject | Metallurgy | pt_PT |
| dc.subject | Quartz | pt_PT |
| dc.subject | Gravel | pt_PT |
| dc.subject | Chemical composition | pt_PT |
| dc.subject | Benguela (Angola) | pt_PT |
| dc.title | Preliminary study of quartz gravel and veins occurring in the Equimina region, Benguela (Angola): potential uses in industry | pt_PT |
| dc.title.alternative | Estudio preliminar de gravas y vetas de cuarzo existentes en la región de Equimina, Benguela (Angola): usos potenciales en la industria | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Ávila, España | pt_PT |
| oaire.citation.endPage | 1342 | pt_PT |
| oaire.citation.startPage | 1339 | pt_PT |
| oaire.citation.title | XI Congresso Geológico de España | pt_PT |
| person.familyName | Lisboa | |
| person.familyName | Rodrigues | |
| person.familyName | Oliveira | |
| person.givenName | Jose | |
| person.givenName | José Feliciano | |
| person.givenName | Álvaro | |
| person.identifier.orcid | 0000-0002-4983-9347 | |
| person.identifier.orcid | 0000-0001-8246-9379 | |
| person.identifier.orcid | 0000-0001-8475-2485 | |
| person.identifier.scopus-author-id | 7003357332 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
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