The leachability of heavy metals from bauxite mine waste

Document Type : Original Research

Authors
A. Khodadadi Darban
M. Moshtagh
Koleini
10.22034/jaert.1.2.69
Abstract
Pollution caused by tailing dam is one of the most important mining industry issues which creates many environmental problems. Among these, heavy metals play a major role in the destruction and degradation of natural habitats and have harmful effects on human health. In first part of this paper, the effective parameters which leach heavy metals from solid waste of bauxite mine have been investigated. The leaching tank test results indicated that among heavy elements vanadium has the highest concentration at pH of 2, temperature of 60°C, residence time of 8 hours, and the ratio of solid phase to liquid phase of approximately 1. The column leaching tests showed that the increase of the input from 0.4 to 0.9 cc at pH of 7, increased vanadium dissolution. Similarly, after increasing column leaching time from 3 to 30 days, the vanadium dissolution will be 2.5 times. When the pH increases from 7 to 13 caused two times dissolution.

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