Red mud is one of the major wastes produced from aluminum industry which utilize bauxite (Al 2 O 3 ) as raw material to extract aluminum out of it. This research work investigates the suitable utilization for a particular red mud samples depending upon its permeability and hazardous characteristics. Red mud was stabilized with Fly ash which is another solid waste material produced from thermal power plants and in combination with gypsum. The Fly ash content was varied from 0%, 15% and 25% and gypsum content is varied from 0%, 0.25% and 0.75% of dry weight of the red mud. The main objective of this research work is to evaluate the environmental impact of red mud utilization and explore the means to allay the leaching problem. The effect on the toxic metals in the leachate coming out from the compacted mix when fly ash is added solely or when combined with gypsum to red mud is to be clarified. All the experiments were carried out on each mix to obtain an optimum mix. The permeability and leachate characteristics are studied for different flowing periods from 1 to 7 days of each sample combination. An attempt further was made to understand the metal concentration in the leachate of raw red mud, red mud -fly ash and red mud-flyash-gypsum combinations. It is revealed from the test results and analysis that stabilization with proper proportioning the hazardous metal concentration and permeability of the red mud will decrease with increase in flow period.
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