Leachability of heavy metals from stabilized/solidified mine tailing in Russia

  • Dr. Hani Abu-Qdais Civil Engineering Department Jordan University of Science and Technology
  • Inna Begday Begday North Caucasian Federal University, Stavropol, St. Pushkin, 1, Bldg. 2, room. 327
  • Konstantin Shkarlet North Caucasian Federal University, Stavropol, St. Pushkin, 1, Bldg. 2, room. 327
  • Konstantin Harin North Caucasian Federal University, Stavropol, St. Pushkin, 1, Bldg. 2, room. 327
  • Anastasia Bluzhina North Caucasian Federal University, Stavropol, St. Pushkin, 1, Bldg. 2, room. 327
  • Andrey Likhovid
Keywords: Heavy metals, immobility percentage, leaching test, North Caucuses, Portland cement, Russia, stabilization and solidification, tailing

Abstract

Mining activities are usually producing significant volume of solid waste which is commonly known as tailing. In most of the cases , tailing contain hazardous pollutants like heavy metals that are  posing risks for environment and public health. Therefore, proper management of tailing to minimize their risks is of great importance.

In this study, the leachability of metals (Cd, Pb, Zn, Ni, Cu, Co, Fe and Mn) from mine tailings was investigated. The mine tailings used for this study have been accumulated for several years at two abandoned Urupsky and Elbrosky tailings dumps in North Caucases, Russia. The mineralogical composition and metals concentration in the tailing were determined using X-Ray diffraction (XRD) and chemical extraction analysis. Solidification of the tailing from Urupsky and Elbrosky sites was performed using ordinary Portland cement in a ratio of 1:3 cement to tailing. The solidified masses were cured in water for different periods of time (0, 14, 21, and 28 days) after which they were subjected to dynamic batch leaching test. Regardless of the initial pH value at the beginning of the leaching test, due to the alkaline nature of cement, the leachate pH has been increased immediately to alkaline range (above 11) for all leachates,

The study revealed that immobility percentage (IP) of the metals ranged from as low as 2% for the Manganese in Elbrosky tailing to as high as 95.8% for Cadmium from Urupski tailing. Despite this, all heavy metals concentrations in the leachate generated at the end of curing period of 28 days were either complying with Russian or USEPA Standards for fresh surface water. This indicates that solidification of tailing using cement is an efficient technology for   decreasing the mobility of the studied heavy metals from both tailing sites.

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Published
2019-08-07
Section
Civil Engineering (1)