بررسي پتانسيل اقتصادي و فراوري عناصر مختلف در كانسار بوكسيت جاجرم (استان خراسان شمالي) و محصولات حاصل از فرايند باير

The study of economic potential and recovery of different elements in Jajarm bauxite ore deposit (northern Khorasan province) and the byproducts of the Bayer process

Jajarm bauxite ore deposit which is the largest bauxite deposit in Iran is located in northern khorasan province. Red bauxite and bauxitic clay are the main parts of the body. Recently by using bayer process, alumina powder (A1203) is producing in the Jajarm alumina producing factory and also large volume of red mud is creating as the byproduct. The main purposes of this paper are comparison of the Jajarm bauxite with other bauxite deposits and study of the recovery potential of different elements in it. Rare Earth Elements (REE) are strongly concentrated in some parts of the bauxitic clay horizon and it seems that they are mostly adsorbed by clay minerals and this is an important factor in low cost of their recovery. In comparison with other bauxite deposits, Jajarm bauxite is not enriched in gallium but this element is strongly enriched in the liquor phase of the bayer process and this implies the importance of gallium in the Jajarm deposit. Red mud is also enriched in Ti02 but it seems that its enrichment of REE and Sc is not economically important. In addition, the comparison of the Jajarm bauxite composition with average composition of the crust, diabase and granites shows enrichment of the Jajarm bauxite from Zr, V, As, Nb, Hf, U, Ta and Bi but their concentrations are not economically important.