عنوان مقاله [English]
The transport of hazardous waste from mining disposal site to groundwater and surface water is one of the most environmental problems. In this research after the characterization of the sample of toxic heavy metals i.e. Zn, Cd, Pb from cobalt in zinc leaching plant of Zanjan, compression and lime neutralization techniques were used for reduction of solubility of heavy metals using column leaching tests. For the compression three levels of 31, 35 and 40 centimeters and for the neutralization three levels of lime addition 0, 1, 2 centimeters were selected in column test. The best conditions were obtained with compression of 31 cm and thickness of 2 cm lime for the lowest solubility of toxic metals to environment.