Sequential evolution of structures resulting from anthracites graphitization: Petrographic approach [Evolução sequencial de estruturas resultantes da grafitização de antracites: Abordagem petrográfica]

• Type: Article in International Scientific Journal
• Date: 2014

Authors

Rodrigues, S (Author) Other; Flores, D (Author) FCUP; Suarez Ruiz, I (Author) Other; Marques, M (Author) Other

Journal

Title: Comunicações Geológicas

Vol. 101

Pages: 845-849

ISSN: 0873-948X

Publisher: LNEG - Laboratório Nacional de Energia e Geologia

Indexing

ISI Web of Knowledge

Scopus - 0 Citations

Other information

Authenticus ID: P-00G-K8V

Abstract (EN): This paper aims to highlight the significance of petrography in the study of structures resulting from the graphitization of anthracites. Three anthracite from Peñarroya- Belmes-Espiel (PBE), Spain, Alto Chicama (AC), Peru and Douro (D), Portugal basins, with different composition and rank (Rr 2.62%, 5.23% and 6.25%, respectively), were carbonized at 1000¿ (carbonization), and then heat treated at temperatures of 1500¿, 2000¿ and 2500¿, in a graphite furnace (graphitization). All samples resulting from heat treatment are predominantly composed of dense particles whose optical behavior varies with temperature, showing similar characteristics to those of graphite in the D sample at 2500¿. With increasing temperature, other graphitic structures develop, such as crystalline aggregates, flakes, and microspheres, which seem to grow mainly at the expense of dense particles. Although occurring in small percentage, these particles reach a significant proportion in the D sample at 2500¿. All these aspects may be observed in a routine microscopic analysis, facilitating the selection of material for further studies. © 2014, LNEG ¿ Laboratório Nacional de Geologia e Energia IP.

Language: Portuguese

Type (Professor's evaluation): Scientific