Impact on leaching behaviour of toxic metals in ferrochrome ash with varying pH levels

In the current investigation, leaching behaviour of cobalt (Co), copper (Cu), iron (Fe), zinc (Zn), calcium (Ca), arsenic (As), cadmium (Cd), chromium (Cr), mercury (Hg), nickel (Ni), lead (Pb) and selenium (Se) from fresh aged Ferrochrome Ash (FCA) samples were studied under various pH conditions (3-11). Results reveal that most elements follow oxyanionic pattern where increase in increases effluent concentration elements. Leached As, Pb, Hg, Ni Fe reached peak at alkaline phases. Cd, Cr Zn followed cationic decreases concentration. Any specified is not by Ca, Se, Co Cu. test high was found to be 156.18 155 mg/L, 13.46 12.89 10.23 10.4 mg/L 6.58 6.72 for FCA ashes respectively. Hence Cr, Hg Pb are identified as significant hazardous pollutants must discharged without being solidified/stabilized. element affected significantly aging FCA.