Mineralogical and sink-float studies of Jajarm low-grade bauxite

Autor: Mirsaleh Mirmohammadi, Mohammad Taghi Shadloo, Mohammad Zarbayani, E. Jorjani, Mohammad Noaparast
Rok vydání: 2010
Předmět:
Zdroj: International Journal of Minerals, Metallurgy, and Materials. 17:251-256
ISSN: 1869-103X
1674-4799
Popis: Jajarm’s bauxite deposits are mainly diasporic, and they have a low mass ratio of Al2O3/SiO2. It is necessary to increase the run-of-mine mass ratio before feeding the material to the Bayer process. Chemical analysis indicated that the low-grade bauxite sample from Jajarm contained 43.9wt% Al2O3 and 13.35wt% SiO2, resulting in a mass ratio of 3.29. According to mineralogical studies, the presence of aluminosilicate minerals such as kaolinite, illite, and quartz was the main reason for the decrease of the mass ratio. Microscopic observations revealed that, with the size reduction from −1000+710 to −38 μm, the liberation degree of diaspore increased from 10% to 60%, and that of aluminosilicates increased from 20% to 85%. Heavy liquids with the densities of 2.8, 3.0, 3.2, and 3.4 g/cm3 were used to evaluate the heavy media separation in three sizes, i.e., −3350+710, −710+212, and −212+125 μm. Laboratory studies confirm that the density of 3.2 g/cm3 can produce the concentrates (in sunk fractions) with recoveries of 89.09%, 91.24%, and 84.68% with the Al2O3/SiO2 mass ratios of 5.03, 5.16, and 5.15 for the −3350+710, −710+212, and −212+125 μm sizes, respectively.
Databáze: OpenAIRE
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