Classification-Dispersion Flotation of Fine Mixed Magnetic Concentrate

doi:10.12068/j.issn.1005-3026.2021.12.013

Abstract

Abstract: The Donganshan mixed magnetic concentrate was separated through the pre-classification-enhanced dispersion flotation process， and the corresponding mechanism was investigated by the sedimentation test， zeta potential test， and turbidity measurement. Under the optimum conditions， a concentrate iron grade of 66.24% and iron recovery of 79.47% can be obtained by the closed circuit of classification-dispersion flotation， in which the recovery of concentrate iron is increased by 4.47% compared with the dispersion flotation results. The sedimentation and turbidity test indicate that the dispersant citric acid and particle size distribution can influence the dispersion state of the hematite-quartz mixture suspension. The adsorption of citric acid onto the hematite surface will increase the electrostatic repulsive force between the mineral particles. The narrow fraction flotation obtained by optimizing particle size distribution can decrease the detrimental hetero-aggregation， which is beneficial to the subsequent flotation separation， which is also supported by the DLVO theory and the agglomeration dynamics.

Key words: fine hematite; classification flotation; dispersion flotation; DLVO theory; agglomeration dynamics

CLC Number:

TD923

LI Dong， ZHONG He-dong， YIN Wan-zhong， HU Yang. Classification-Dispersion Flotation of Fine Mixed Magnetic Concentrate[J]. Journal of Northeastern University(Natural Science), 2021, 42(12): 1761-1767.

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