Abstract
The phenomenon of particle aggregation occurs when ammonium chloride is used as a leaching reagent to infiltrate rare earth samples. To reveal the formation and evolution mechanisms of aggregates, a self‐developed column leaching experimental device was employed in conjunction with nuclear magnetic resonance technology. The relationships among the amount of rare earth leaching, the evolution of the microscopic pore structure, the porosity, and the leaching time were obtained. A comparative analysis of pure water and ammonium chloride test groups revealed that aggregates were present only in the latter. Consequently, the results of comprehensive analyses indicate that the formation of aggregates is a temporary particle deposition phenomenon caused by the settling of fine soil particles migrating from the top to the bottom of a sample. Furthermore, chemical exchanges constitute the main cause of aggregate formation.
Highlights
Ion-adsorption rare earth ore, known as weathering shell leaching rare earth ore, was first discovered in a foot cave in Longnan County, Jiangxi Province, in the late 1960s
Mining is conducted through a relatively mature process known as in situ leaching and mining, which uses mainly chemical exchange reactions composed of a leaching solution during the seepage process of an ore body to recover rare earth cations, thereby extracting rare earth elements [6,7,8,9]. e rare earth leaching rate depends on the degree of the chemical exchange and the seepage of the rare earth mother liquor in the ore body. is ion-adsorption rare earth leaching process includes both analytical and antiadsorption processes. e exchange of rare earth cations is performed under dynamic equilibrium conditions
A previous experimental study found that the rare earth leaching rate is affected by changes in the microscopic pore structure during the seepage process [10]. erefore, research on the relationship between the evolution of the pore structure and the leaching rate during the rare earth leaching process is highly significant for the development of green extraction technologies and for the efficient recovery of ion-adsorption rare earth ores
Summary
Ion-adsorption rare earth ore, known as weathering shell leaching rare earth ore, was first discovered in a foot cave in Longnan County, Jiangxi Province, in the late 1960s. A previous experimental study found that the rare earth leaching rate is affected by changes in the microscopic pore structure during the seepage process [10]. Erefore, research on the relationship between the evolution of the pore structure and the leaching rate during the rare earth leaching process is highly significant for the development of green extraction technologies and for the efficient recovery of ion-adsorption rare earth ores. Zhuo et al used nuclear magnetic resonance (NMR) scanning to study the relationship between the pore size distribution and the weakening of the intensity of ion-adsorption rare earth leaching processes, thereby revealing the mechanism through which the ore body strength. Based on NMR technology, this paper studies the evolutionary mechanism of the pore structure during the leaching of rare earth ore bodies and finds the relationship between internal structural changes and the leaching rate of ore bodies. Based on NMR technology, this paper studies the evolutionary mechanism of the pore structure during the leaching of rare earth ore bodies and finds the relationship between internal structural changes and the leaching rate of ore bodies. is study provides an important research basis for the leaching and extraction of ion-adsorption rare earth ores
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
