Mechanical entrainment study by separately collecting particle deposit on matrix in high gradient magnetic separation

Significantly Improved Separation Efficiency of Refractory Weakly Magnetic Minerals by Pulsating High-Gradient Magnetic Separation Coupling with Magnetic Fluid

“…A hole (30 mm diameter) was drilled along the axis of the iron poles to insert a square acrylic channel (inner side length 16 mm) for slurry feeding. The middle part of the channel was substituted by a matrix box, which allowed the installation of a single or multiple matrices . In this study, five matrices (SUS430) were installed in the matrix box and eight other acrylic bars (circles and semicircles) were used to normalize the flow field around matrices.…”

“…Device Fabrication and Setup. Experiments were conducted in a device system especially manufactured for investigating mechanical entrainment and competing capture in HGMS, 46 As shown in Figure 5, the whole system mainly consists of four parts: a material feeding part, a magnetic system, a slurry channel with a matrix box, and a pulsating mechanism. The feeding part included a stirring tank and a peristaltic pump.…”

“…The middle part of the channel was substituted by a matrix box, which allowed the installation of a single or multiple matrices. 46 In this study, five matrices (SUS430) were installed in the matrix box and eight other acrylic bars (circles and semicircles) were used to normalize the flow field around matrices. Details of the matrix configuration are shown in the right part of Figure 6; matrices with aspect ratios of 1, 2, 3, and 4 were considered.…”

“…According to eq , the repulsive magnetic force increases with increasing fluid susceptibility. For nonmagnetic gangue minerals with a high density or large size, the magnetic fluid can be used to weaken the effect of gravity and decrease mechanical entrainment (which is typically difficult to be eliminated by a pulsating flow) …”

“…For nonmagnetic gangue minerals with a high density or large size, the magnetic fluid can be used to weaken the effect of gravity and decrease mechanical entrainment (which is typically difficult to be eliminated by a pulsating flow). 46 Principles of eliminating the occurrence of competing capture between magnetic valuable and gangue minerals by HGMSCMF are illustrated in Figure 4. For magnetic gangue particle P1 (susceptibility κ p1 = a; volume V p1 = 3b; a and b are generalized algebraic values) and valuable mineral particle P2 (susceptibility κ p2 = 3a; volume V p2 = b), competing capture will occur due to equal magnetic forces F m (F m = μ 0 kVHgradH) acting on P1 and P2.…”