Dissolution Behaviors of Trace Muscovite during Pressure Leaching of Hydrothermal Vein Quartz Using H2SO4 and NH4Cl as Leaching Agents

Abstract

Dissolution behaviors of trace muscovite during pressure leaching of hydrothermal vein quartz using H 2 SO 4 and NH 4 Cl as leaching agents have been studied by means of optical and electronic microscopes. Phase transformations of pure muscovite during calcination and the pressure leaching were analyzed by powder X-ray diffraction (XRD) and thermal analysis (TG-DSC), which are used for indirectly discussing dissolution mechanisms of the trace muscovite. Structure damages of trace muscovite are caused by calcination, and further developed during pressure leaching of the quartz sand using H 2 SO 4 and NH 4 Cl as leaching agents. The trace muscovite is dissolved, and then efficiently separated from quartz sand by coupling effects of calcination and fluorine-free pressure leaching.

Potassium-bearing species in fertiliser obtained by hydrothermal modification of glauconitic siltstones with calcium hydroxide

“…However, it is important to stress that Verdete is an ore made up of a mixture of these minerals, and the mechanism for a given mineral may be influenced by the presence of the others. For example, sulphuric acid is efficient in breaking down the structures of K-feldspar (Ma et al 2017), muscovite (Pei et al 2018) and glauconite (Rudmin et al 2018). In Verdete, the release of potassium under the action of the acid occurs primarily due to the rupture of the micas, while the contribution of K-feldspar appears to be minimal (Schimicoscki et al 2020).…”

Editorial for Special Issue “Mineralogy of Quartz and Silica Minerals”

“…The papers by Götze et al [3], Lin et al [4], Pei et al [5] and Guatame-Garcia and Buxton [6] impressively demonstrate how advanced analytical methods are being used for the characterization of mineral properties and how this knowledge can be used for processing. The material that was investigated in these studies includes high-purity quartz from metamorphic host rocks, hydrothermal vein quartz, as well as diatomite.…”