Abstract:
The bioleaching behaviour of low-grade bauxite ore of pail deposits (Khushab), Pakistan using different strains of Aspergillus niger(NRRL567, NRRL1737 and NRRL605). X-ray diffraction examination of ore revealed the presence of a number of silicate and aluminosilicate minerals. Average content of alumina in test ore was 40%. Decrease in pH i.e. in the range of 2-2.4 was observed due to organic acids produced by A. niger strains during growth on liquid media containing glucose. Fungal nutrient requirement was unsatisfied at final media glucose concentration of 5%. Maximum of ~4g/L Al2O3 was solublized having bauxite pulp density 5%. Scanning electron microscopy along with electron disperse X-ray analysis (SEM-EDX) reflected significant alumina solubilization.
Huma Rashid , Haq Nawaz and T.M. Bhatti , 2001. Bioleaching Studies of Bauxite Ore Using Aspergillus niger. Journal of Biological Sciences, 1: 501-504.
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