Iron removal from Turkish quartz sand by chemical leaching and bioleaching

Minerals & Metallurgical Processing , 2009, Vol. 26, No. 1, pp. 35-40

Arslan, V.; Bayat, O.

ABSTRACT:

The primary advantage of using oxalic acid is in the formation during leaching of soluble complexes that are both photochemically and microbiologically degradable. In this study, chemical leaching and bioleaching methods were used for quartz sand. Using the ANOVA-Yates test technique, the effects of solids rate, temperature and oxalic acid rate were investigated using chemical leaching experiments. Solids rate and temperature were effective parameters on the chemical leaching. After the tests, the removal of Fe₂O₃ increased to 97.02%. Finally, the iron content decreased from 0.315% Fe₂O₃ to 0.0094% Fe₂O₃ in the leached quartz sand. The effect of pulp density was investigated on the bioleaching experiments. The bioleaching of iron oxides by Aspergillus niger resulted in removal of 47.70% of the total iron in the quartz sand, and suggested that this strain has not a good ability to remove iron impurities from quartz sand in comparison with chemical leaching. The iron content decreased from 0.315% Fe₂O₃ to 0.164% Fe₂O₃ in the bioleached quartz sand.