Evaluation of the effect of desliming and alternatives in iron ore reverse flotation circuits
Avaliação do efeito da deslamagem e alternativas em circuitos de flotação reversa de minério de ferro
Palavras-chave:
Desliming, Flotation, Vertical pulsation high gradient magnetic separatorResumo
Iron ore reverse flotation has been the main concentration process applied in iron ore processing plants since the 1970s. The performance of this process has been strongly affected by the control of the previous desliming stages. The presence of ultrafine particles promotes selectivity losses in the flotation circuits, in addition to a significant increase in the consumption of chemical reagents and pumping energy. The removal of ultrafine particles promotes metal losses, the need for additional dewatering steps, difficulties in handling and stacking together with flotation waste. This study focuses on investigating the feasibility of replacing desliming with high intensity vertical magnetic concentrators (VPHGMS). Pilot tests were carried out with this type of magnetic concentrator followed by flotation, the results show an increase in metal recovery of 4% when compared to the traditional desliming and flotation circuit, drastic possibility of reducing energy, chemical reagents and foot print and potential to reduce capex and opex by 22% and 24%, respectively, for new projects.
Downloads
Referências
ANM, Anuário Mineral Brasileiro, principais substâncias metálicas, 2020, www.anm.gov.br.
CETEM, Tratamento de Minérios, capítulo 6 Classificação e Peneiramento, Correia, J.C., 5ª Edição, 2010.
Dobbins, M., Dunn, P., Sherrell, I. Recent advances in magnetic separator designs and applications. The 7th International Heavy Minerals Conference What next. The Southern African Institute of Mining and Metallurgy, 2009.
Clemmer, J. B. Flotation of iron ore. In Proceedings of the 8th Annual Mining Symposium, Duluth, MN, USA, 15 January 1947.
Filippov, L.O., Severov, V., Filippova, I.V. An overview of the beneficiation of iron ores via reverse cationic flotation. Int. J. Miner. Process. 127, pp. 62-69, 2014.
Lima, N.P., Peres, A.E.C., Marques, M.L.S. Effect of slimes on iron ores flotation. Int. J. Min. Eng. Miner. Process.,1, pp.43-46, 2012.
Lima, N.P., Ferreira, M.T.S., Ruffei, M., Ferreira, R.F., Piret, W., Galbialtti, H.F., Quadrilátero Ferrífero: cinco décadas de histórias, descobertas, importância econômica e tecnológica e novas fronteiras para a mineração de ferro. Livro: Quadrilátero Ferrífero: Avanços do conhecimento nos últimos 50 anos, pp.319-341, 2020.
Ma, M. Flotation mechanism of Kaolinite under reverse cationic flotation conditions. In Advances in Environmental Research, Nova Science: New York, NY, USA, Volume 12, pp. 197-206, 2011.
Pinto, P.H.F., Aproveitamento de lamas do Quadrilátero Ferrífero por concentração magnética de alta intensidade de campo magnético. Tese de doutorado, Escola Politécnica da Universidade de São Paulo, 2019.
Rosiére C.A., Chemale F. Jr, Itabiritos e minérios de ferro de alto teor do Quadrilátero Ferrífero – uma visão geral e discussão. Geonomos, 8, pp.27-43, 2001.
