بررسی عناصر کمیاب و خاکی نادر در حوزه‌های زغالی ایران (در معدن زیر زمینی زغالسنگ کارمزد)

This research presents data on widespread abnormal accumulations of Trace and Rare Earth Elements in many coal deposits worldwide. There have been many studies on the distribution and geochemistry of REEs in coal. ∑REE content in most coals varies from several µg/g to several hundred µg/g, and the REEs are distributed in minerals although some are associated with organic material in coal. In this Study, 4 samples from Karmozd coal mine in Alborz region of Iran have been analysed using ICP-MS method. The Results show some Trace and Rare Earth Elements accumulation in coal basin of Iran are much higher than China, USA, most world coal and Clark value. In Karmozd coal mine, the average ∑REE and outlook index (Coutl) are 378/21 µg/g, 0/48 respectively. The enrichments origin of these elements in karmozd coal basin is clastogenic and related by leach of pyroclastic materials riched from light rare earth elements. At present usual REE deposits (Carbonatite and weathered crust elution) are being exhausted therefore, it is possible to recover REE during different stages of developing such coal deposits: overburden removal, coal mining and combustion, and after exhaustion of the solid fuel resources.