Tecnologia em Metalurgia, Materiais e Mineração
https://tecnologiammm.com.br/article/doi/10.4322/2176-1523.20191936
Tecnologia em Metalurgia, Materiais e Mineração
ABM Week 2018

ESTUDO DA RELAÇÃO ENTRE AS PROPRIEDADES DOS CARVÕES E A MICROESTRUTURA POROSA DOS COQUES

STUDY OF THE RELATIONSHIP BETWEEN COAL PROPERTIES AND COKE MICROSTRUCTURE

Anderson Azevedo Agra, Bruno Deves Flores, Anderson Nicolodi, Guilherme Liziero Ruggio da Silva, Antônio Cesar Faria Vilela, Eduardo Osório

Downloads: 0
Views: 27

Resumo

A resistência mecânica do coque metalúrgico está intimamente relacionada com sua microestrutura porosa, de forma que o conhecimento quantitativo dos parâmetros microestruturais formada pelos diferentes tipos de carvões pode ser de grande utilidade. Nesse trabalho foram produzidos coques laboratoriais a partir de carvões com diferentes propriedades. A caracterização microestrutural foi realizada a partir de uma metodologia proposta de microscopia ótica associada a análise de imagem. O estudo indica que o teor matéria volátil, fluidez e a composição maceral dos carvões são preponderantes na formação da microestrutura porosa dos coques. O carvão de alta matéria volátil e alta fluidez estudado deu origem a um coque com elevada porosidade e com poros grandes. O carvão ensaiado com elevada quantidade de macerais do grupo da inertinita gerou coque com microestrutura de baixa porosidade, no entanto com grande concentração de poros de baixa circularidade. O carvão e a mistura com conteúdo de matéria volátil e fluidez intermediários deram origem a coques com microestruturas porosas compostas por poros de pequenas dimensões e com formas mais adequadas.

Palavras-chave

Coque metalúrgico; Microestrutura; Porosidade; Carvão

Resumen

The mechanical strength of metallurgical coke is closely related to its porous microstructure, so that the quantitative knowledge of the microstructural parameters formed by the different types of coals can be very useful. In this work laboratory cokes were produced from coals with different properties. The microstructural characterization was performed from a proposed methodology of optical microscopy associated with image analysis. The study indicates that the volatile matter content, fluidity and the maceral composition of the coals are preponderant in the formation of the porous microstructure of the cokes. Coals of high volatile matter and high fluidity studied formed cokes with high porosity and large pores. The coal with high content of the inertinite maceral group gave rise to a coke with microstructure of low porosity, although with great concentration of pores of low circularity. The coal and blend with volatile matter content and fluidity intermediate formed cokes with microstructure composed by pores of small sizes and more suitable forms.

Palabras clave

Coke; Microstructure; Porosity; Coal.

Referências

1. Patrick JW, Walker A. Macroporosity in cokes: its significance, measurement, and control. Carbon. 1989;27(1):117- 123.

2. Sato H, Patrick JW, Walker A. Effect of coal properties and porous structure on tensile strength of metallurgical coke. Fuel. 1998;77(11):1203-1208.

3. Andriopoulos N, Loo CE, Dukino R, McGuire S. Micro-properties of australian coking coals. ISIJ International. 2003;43(10):1528-1537.

4. Kubota Y, Nomura S, Arima T, Kato K. Quantitative evaluation of relationship between coke strength and pore structure. Tetsu-To-Hagane. 2010;96(5):328-336.

5. Donskoi E, Poliakov A, Mahoney MR, Scholes O. Novel optical image analysis coke characterisation and its application to study of the relationships between coke structure, coke strength and parent coal composition. Fuel. 2017;208:281-295.

6. Meng, Fanyu Et Al. Characterization of microstructure and strength of coke particles and their dependence on coal properties. Powder Technology. 2017;320:249-256.

7. Agra AA, Flores BD, Nicolodi A, Silva GLR, Vilela AC, Osório E. Microestrutura do coque: desenvolvimento de análise quantitativa via microscopia ótica associada a análise de imagem. In: Associação Brasileira de Metalurgia, Materiais e Mineração. Anais do 48º Seminário de Redução de Minérios e Matérias-primas; 2018; São Paulo, Brazil. São Paulo: ABM Week; 2018.

8. Díez MA, Alvarez R, Barriocanal C. Coal for metallurgical coke production: predictions of coke quality and future requirements for cokemaking. International Journal of Coal Geology, 2002;50(1-4):389-412.

9. Fernández AM, Barriocanal C, Díez MA, Alvarez R. Importance of the textural characteristics of inert additives in the reduction of coal thermoplastic properties. Fuel. 2010;89(11):3388-3392.

10. Loison R, Foch P, Boyer A. Coke: quality and production. 2nd ed. Paris: Ed. Butterworths; 1989.

5db3416c0e8825b81b61d429 tmm Articles
Links & Downloads

Tecnol. Metal. Mater. Min.

Share this page
Page Sections