Formation mechanisms of surface passivating phases and their impact on the kinetics of galena leaching in ferric chloride, ferric perchlorate, and ferric nitrate solutions

Ferric methanesulfonate as an effective and environmentally sustainable lixiviant for Zn extraction from sphalerite (ZnS)

“…The observed texture features are consistent with distinguishable features of fluid-driven mineral replacement reactions, (1) the product phase contain pores [55,56], and (2) there is a sharp reaction front between the primary and product mineral, and as the reaction progresses the reaction front moves from the surface to the interior of the grain being replaced [54]. Many experimental studies have demonstrated that pseudomorphic mineral replacement is controlled by a coupled dissolutionreprecipitation (CDR) mechanism [4,8,54,[57][58][59][60][61][62][63][64][65]. When an undersaturated fluid contacts the primary mineral, a small amount of primary mineral dissolves from the grain surface and the fluid near the grain surface (interfacial fluid) becomes supersaturated with respect to the product phase, leading to precipitation of the product phase just adjacent to the dissolution site.…”

Rapid Marcasite to Pyrite Transformation in Acidic Low-Temperature Hydrothermal Fluids and Saturation Index Control on FeS2 Precipitation Dynamics and Phase Selection

“…The in situ synchrotron PXRD experiments were carried out at the powder diffraction beamline at the Australian Synchrotron in Melbourne, Australia, using an X-ray energy of 21 keV (λ = 0.5904 Å), calibrated using a LaB 6 standard (NIST SRM 660b). The schematic of the experimental setup is shown in Figure a, which was used in previous studies. − A quartz glass capillary (1.3 mm in outer diameter, 0.1 mm in wall thickness, and 40–45 mm in length) was used as the microreactor for the experiments. A hot air blower was positioned about 3 mm below the capillary to heat 10 mm of the capillary length.…”

A Flow-Through Reaction Cell for Studying Minerals Leaching by In-Situ Synchrotron Powder X-ray Diffraction

“…An in-situ PXRD experiment on galena leaching was carried out under the condition summarized in Table 1. A high-purity galena specimen from Quiruvilca Mine, Santiago de Chuco Province, La Libertad, Peru, was used [6,38]. The galena was ground to less than 38 μm, controlled by a 38 μm sieve.…”

“…A clear understanding of the mechanism and kinetics of mineral leaching is important for further optimization of leaching parameters [1][2][3][4]. Leaching is commonly studied by ex-situ techniques, which involve the recovery of leached products by cooling and filtration and subsequent characterization [3][4][5][6][7]. Ex-situ techniques provide valuable information, but the results may not reflect the true mechanism of leaching because samples may have changed during recovery.…”