The petrology and geochemistry of Sorkheh-Dizaj intrusive rocks in northern Zanjan and its effects on recovery of LREE from tailingby digestion-water leaching processes, Iran

Iranian Journal of Earth Sciences

مقاله 5، دوره 15، شماره 4، دی 2023، صفحه 248-263   

نوع مقاله: Original Research Paper

شناسه دیجیتال (DOI): 10.30495/ijes.2023.1936911.1639

نویسندگان

Ahmad Adib^* ؛ Esmaeil Rahimi

Department of Petroleum and Mining Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran.

چکیده

Magnetite-apatite mineralization in Tarom Mountains at the western part of Alborz-Azerbaijan belt originated from quartz monzonite magma and belongs to high K calc-alkaline, showing a post-collision tectonic environment. The negative trend from LREEs to HREEs is consistent with the spider pattern of the subduction areas. In this article, the recovery of the rare-earth elements (REEs) from apatite flotation concentrate by acid leaching and digestion-water leaching were studied. The total amount of LREEs in the tailings sample is between 1500 - 2600 ppm. The most frequent elements are Ce, La, Nd, and Y. Among them Ce is the most abundant and La is the least.. The maximum LREEs recovery with the sulfuric acid leaching was62% with experimental parameters of 12 M acid concentration, 4 h leaching time, 25℃ heat, and a liquid to solid ratio (L/S) of 1:5. under optimal parameters of (220℃), (3 h), and L/S (1:2), the digesting with sulfuric acid resulted to the recovery of La, Ce, Nd, and Y with  93.92%, 92.22%, 92.04%, and 91.00%, respectively. similarity, the best conditions at water leaching process, are the leaching time of 5 h, at 80℃, and L/S of 1:10 for La, Ce, Nd, and Y recovery are respectively 89.50%, 88.45%, 92.20%, and 94.0%.

کلیدواژه‌ها

Acid leaching؛ LREE؛ Morvarid Mine؛ Digest- water leaching

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