Influence of hematite particle morphology on friable itabirite concentration in Humphreys spiral concentrator / Influência da morfologia da hematita presente em itabirito friável na concentração por espiral concentradora Humphreys

Fábio de São José, João Paulo Sousa Coelho, Carlos Alberto Pereira

Abstract


The depletion of hematitic mineral deposits and the growing content of itabirites in the iron ores mined in the Quadrilátero Ferrífero - Brazil calls for further studies in an effort to adjust the actual technologies, due to the different behaviors of the different mineral species present in the new ore. Currently, little is known about the fundamentals of particle separation in Humphreys spiral, as far as the different particles morphologies. Therefore, the performance of a spiral concentrator was evaluated by a sequence of friable itabirite tests at an industrial scale. The smallest iron content and smaller metallurgical recovery attained in the tests owe to a small particle size in sample (33.67% < 106 µm and d80 ≈ 675 µm) and a greater content of tabular hematite. The sample showing the worst metallurgical recovery results (46.20%) and iron content (62.39%) also presented the highest percentage of tabular hematite (68.69%). The samples with a greater amount of martite produced sinter feed with the highest metallurgical recovery (65.65%). It is believed that there was a predominant effect of the hematite morphology on other parameters such as density. Thus, a careful characterization step and the adoption of blending procedures concerning iron content and morphology simultaneously can be positive for the process.

 


Keywords


friable itabirite; Humphreys spiral concentrator; mineral morphology; metallurgical recovery.

References


ARROYO, O. C. E. Caracterização geometalúrgica e modelagem geoestatística da Mina de Brucutu – Quadrilátero Ferrífero (MG). (Tese), Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2014.

BARBOSA, P. F. Caracterização microestrutural e textural de agregados do Quadrilátero Ferrífero. (Tese), Escola de Minas, Universidade Federal de Ouro Preto, Ouro Preto, 2009.

BARBOSA, P. F.; LAGOEIRO, L. Crystallographic texture of the magnetite-hematite transformation: evidence for topotactic relationships in natural samples from Quadrilátero Ferrífero, Brazil. American Mineralogist, 95, p.118-125, 2009.

BARBOSA, P. F.; SCHOLZ, R.; GRAÇA, L.; ALVAREZ, G. Electron Backscattering Diffraction (EBSD) as a tool to evaluate the topotactic and epitactic growth of minerals: the example of the magnetite and hematite. Microscopy and Microanalysis, 17, p. 408-409, 2011.

BURT, R. O. Gravity Concentration Technology, Elsevier, Amsterdam. 1984

DENG, Z. T. Experimental Investigation of Particle Flow in a Spiral Concentrator. McGill University Montreal, 2015.

GRAÇA, L. M.; LAGOEIRO, L. E.; GALÉRY, R.; PERES, A. E. C. Effects of hematite surface characteristics on filtration process. Rem: Revista Escola de Minas, 69(2), p. 199-205, 2016.

HOLLAND-BATT, A. B. A study of the potential for improved separation of fine particles by use of rotating spirals. Minerals Engineering, 5(10–12). p. 1099-1112, 1992b.

HOLTHAM, P. N. Primary and secondary fluid velocities on spiral separators. Minerals Engineering, 5(1). p. 79-102, 1992.

NASCIMENTO, J. C. S.; NASCIMENTO, J. S. S.; RIBEIRO, P. S., MELO, F. B. S.; SOUSA, L. M.; REIS, P. S. G. Mineração através do beneficiamento à seco em Canaã dos Carajás-Pa: alternativa para a barragem de rejeitos. Brazilian Journal of Development, 6(10) p. 80788-80800, 2020.

NOGUEIRA, F. C.; RODRIGUES, O. M. S.; NOGUEIRA, S. C. S.; PEREIRA, C. A. Hydrophobic aggregation of galena fine particles. Brazilian Journal of Development, 6(7). p. 53581-53590, 2020.

SAMPAIO, C. H.; TAVARES, L. M. M. Beneficiamento Gravimétrico: uma introdução aos processos de concentração mineral e reciclagem de materiais por densidade. 1ª ed. Porto Alegre: UFRGS Editora, 2005.

SIVAMOHAN, R.; FORSSBERG, E. Principles of Spiral Concentration. International Journal of Mineral Processing, 15. p. 173-181, 1985.

SPOTTISWOOD, D. J.; ATASOY, Y. A study of particle separation in a spiral concentrator. Minerals Engineering, 8(10). p. 1197-1208, 1995.

SUBRAHMANYAM, T. V.; SUN, Z.; FORSSBERG, K. S. E.; FORLING, W. Variables in the shear flocculation of galena. In: GRAY, P. M. J; BOWVER, G. J; CASTLE, J. F; VAUGHAN, D. J. Sulphide deposits-their origin and processing. Dordrecht: Springer, p. 223-231, 1990.

VALADÃO, G.; EDUARDO, S.; ARAÚJO, A. C. Introdução ao tratamento de minérios. Belo Horizonte: Editora UFMG, 2007.




DOI: https://doi.org/10.34117/bjdv7n2-424

Refbacks

  • There are currently no refbacks.