Abstract
The amine extractants, bis(2-ethylhexyl)amine, N,N-dimethylethanolamine, and trioctylamine were used to recover silver(I) ions from chloride solutions. The effect of the pH, contact time, extractant concentration and reextraction were studied. It was found that extraction of silver(I) depended on the pH, extractant concentration and strongly on the contact time. Reextraction of Ag(I) ions from the loaded organic phase showed that the metal can be removed in over 50% for the three extractant using sodium hydroxide. The recovery of silver from the chloride leaching solutions were above 85% for bis(2-ethylhexyl)amine, above 58% for N,N-dimethylethanolamine, and above 70% for trioctylamine.
Highlights
Use Sulphurous copper ores have polymetallic character, which means that they contain a series of other chemical elements and some of them may be significant for reclamation process
It was expected that the efficiency of the extraction process of Ag by amine extractants, bis(2ethylhexyl)amine (BEHA), N,N-dimethylethanolamine (DMEA), and trioctylamine (TOA) should mainly depend on the metal-extractant complex formation and the concentration of the extractable Ag(I) species
It was presumed that in case of the amine extractant use in this experiment nitrogen could positively influence on extraction of Ag(I), according to theory hard and soft acids and bases (HSAB) [15]
Summary
Use Sulphurous copper ores have polymetallic character, which means that they contain a series of other chemical elements and some of them may be significant for reclamation process. The supporting elements, which concentrate in different production streams, constitute useful ingredients, such as silver, nickel, cobalt, gold, platinum, or undesirable pollutants whitch have to be removed from processing systems (Pb, As, Cd, Hg, F, Sb) [1, 2]. The majority of those products may become the potential raw material for the silver reclamation. It is being estimated that about a half of worldwide production of silver is a result of the reclamation of its various raw materials and wastes, which is a phenomenon of growing tendency [3,4,5]
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