1962 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
that were not subjected to the magnetic field for enough
time to be captured.
It is also noteworthy that the combination of matrix
height and high magnetic fields is crucial for the recovery
of these materials. Even with an extended matrix, the mag-
netic field needs to be elevated to the point of overcoming
competing forces, namely, the hydrodynamic force of the
pulp.
Additional tests were conducted with other samples,
further confirming the effectiveness of this new HighMAG ®
technology.
CONCLUSION
Ultrafine iron ore particles have been the subject of various
studies to find an industrially feasible way for their recov-
ery. Building upon a widely applied technology for iron ore
processing, high-intensity magnetic separation, innovative
ways were sought to achieve this goal.
The magnetic matrices, which usually had a height of
220mm, were changed to a height of 440mm. This change
allowed for up to a 2.5-fold increase in mass recovery with-
out compromising the iron content in the concentrate,
keeping it constant.
In other words, it became possible to capture particles
that were previously sent to rejects because they were not
exposed for a sufficient time under the magnetic field,
increasing mass recovery and thereby reducing the amount
of material discarded in tailings dams.
Additional tests were conducted with other samples,
maintaining the standard of results observed in this study
and thus confirming the efficiency of this technology.
REFERENCES
Figueira, H. V. O. luz, A. B. da almeida, S. L. M. de.
Britagem e Moagem. Comunicação Técnica elaborada
para o Livro Tratamento de Minérios, 5ª Edição –
Capítulo 4 – pág. 143–211. Rio de Janeiro, 2010.
Gonçalves, T. A. R Lima, N. P Bicalho, L.S Peres, A. E.
C. Application of colloidal magnetic coating in mag-
netic separation of iron ore taillings. 22° Simpósio de
Mineração -ABM WEEK 7ª edição. São Paulo, 2023.
PUC-RJ. Access in: https://www.maxwell.vrac.puc-rio
.br/21365/21365_3.PDF.
Silva, M. B. da. Separação magnética de ultrafinos hema-
títicos. Programa de Pós-Graduação em Engenharia
Mineral – PPGEM – Universidade Federal de Ouro
Preto. Ouro Preto, 2012.
Silva, R. M. R Nunes, R. M Nogueira, F. C Silva, F. L.
Aproveitamento do rejeito de minério de ferro da Mina
do Andrade para a confecção de blocos intertravados.
Tecnologia em Metalurgia, Materiais e Mineração.
2023.
Svoboda, J. Magnetic Techniques for the Treatment of
Materials. Kluwer academic publishers. United States
of America, 2004.
Figure 7. Iron content in the tailings of tests with different percentages of solids
that were not subjected to the magnetic field for enough
time to be captured.
It is also noteworthy that the combination of matrix
height and high magnetic fields is crucial for the recovery
of these materials. Even with an extended matrix, the mag-
netic field needs to be elevated to the point of overcoming
competing forces, namely, the hydrodynamic force of the
pulp.
Additional tests were conducted with other samples,
further confirming the effectiveness of this new HighMAG ®
technology.
CONCLUSION
Ultrafine iron ore particles have been the subject of various
studies to find an industrially feasible way for their recov-
ery. Building upon a widely applied technology for iron ore
processing, high-intensity magnetic separation, innovative
ways were sought to achieve this goal.
The magnetic matrices, which usually had a height of
220mm, were changed to a height of 440mm. This change
allowed for up to a 2.5-fold increase in mass recovery with-
out compromising the iron content in the concentrate,
keeping it constant.
In other words, it became possible to capture particles
that were previously sent to rejects because they were not
exposed for a sufficient time under the magnetic field,
increasing mass recovery and thereby reducing the amount
of material discarded in tailings dams.
Additional tests were conducted with other samples,
maintaining the standard of results observed in this study
and thus confirming the efficiency of this technology.
REFERENCES
Figueira, H. V. O. luz, A. B. da almeida, S. L. M. de.
Britagem e Moagem. Comunicação Técnica elaborada
para o Livro Tratamento de Minérios, 5ª Edição –
Capítulo 4 – pág. 143–211. Rio de Janeiro, 2010.
Gonçalves, T. A. R Lima, N. P Bicalho, L.S Peres, A. E.
C. Application of colloidal magnetic coating in mag-
netic separation of iron ore taillings. 22° Simpósio de
Mineração -ABM WEEK 7ª edição. São Paulo, 2023.
PUC-RJ. Access in: https://www.maxwell.vrac.puc-rio
.br/21365/21365_3.PDF.
Silva, M. B. da. Separação magnética de ultrafinos hema-
títicos. Programa de Pós-Graduação em Engenharia
Mineral – PPGEM – Universidade Federal de Ouro
Preto. Ouro Preto, 2012.
Silva, R. M. R Nunes, R. M Nogueira, F. C Silva, F. L.
Aproveitamento do rejeito de minério de ferro da Mina
do Andrade para a confecção de blocos intertravados.
Tecnologia em Metalurgia, Materiais e Mineração.
2023.
Svoboda, J. Magnetic Techniques for the Treatment of
Materials. Kluwer academic publishers. United States
of America, 2004.
Figure 7. Iron content in the tailings of tests with different percentages of solids