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Abstract
Heavy metal-containing waste has become one of heavy environmental problems. Processing of such waste accumulated at waste dumps to extract valuable components is commercially beneficial activity and, in addition, decreases environmental impact. In this study, Lewatit MonoPlus TP 207 (TP 207) ion exchange resin was evaluated for its suitability for selective removal of cobalt (Co) and copper (Cu) from mine waste waters, generated by heap leaching waste materials at a Chilean copper mine. In series of laboratory scale fixed-bed ion exchange column tests, the effects of process parameters, such as waste water flow rate and regenerant (sulfuric acid) concentration, were studied in both waste water treatment by the ion exchange resin process and the resin regeneration (metals eluting) process. The regeneration process tests were performed using 1 % and 10 % sulfuric acid. The best separation of the metals (in the eluting process) was achieved with regeneration of TP 207 resin using 1 % sulfuric acid at flow rate of 1 bed volume per hour (BV/h).
Highlights
Copper is a metal of choice for technologists and important metal with wide range of industrial applications such as plumbing, electroplating, manufacture of wires/cables for various industries, building, machine building, etc. [5]
Tests on metal sorption on TP 207 ion exchange resin column Fig.1, a shows the curves of copper and cobalt concentrations in contact with TP 207 resin at flow rate of 10 ml/h (1 bed volume per hour (BV/h))
No samples were taken in interval between 85 ‒ 130 bed volumes
Summary
Copper is a metal of choice for technologists and important metal with wide range of industrial applications such as plumbing, electroplating, manufacture of wires/cables for various industries, building, machine building, etc. [5]. In El Salvador mining district, tailings were disposed around mine pits [3], and over the shore [7] This has resulted in formation of large tailings deposits in this area [9]. Atmospheric leaching of the zone material results in leaching of bivalent metal cations, such as Cu2+, Ni2+, and Zn2+ in concentrations up to 2265 mg/l, 18.1 mg/l, and 20.3 mg/l, respectively, in the mine tailings drainage waters [7]. This is very dangerous situation because these heavy metal concentrations are much above the approved maximum concentration limits
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