Kinetics of Formation of Concentrated Copper (I) Solutions and Their Role in Hydrometallurgy and Electrorefining: A Green Perspective

2018 ijghc  
The Chemistry of monovalent copper, i.e., Cu(I) has been exploited to a great extent in the past few decades. Physicochemical studies like molar conductance, viscosity, isentropic compressibility and NMR of Cu(I) complexes with anions such as ClO4 -, NO3 -, SO4 -, HSO4 -, etc. and their derivatives with organic ligands like Acetonitrile, Benzonitrile, Phenanthroline, Dimethyl phenanthroline, Bipyridyl, Thiourea, etc. have been carried out in aqueous and nonaqueous solvents. In addition to these
more » ... studies, the area of reaction kinetics of the rates of formation of concentrated Cu(I) solutions in binary mixtures of acetonitrile (AN) and dimethylsulfoxide (DMSO) with water (H2O) has also been explored much. It was found that these reactions had strong dependence on the concentration of Cu(II), Ag(I) and Au(I) solution taken for the reaction, quantity and particle size of copper/nickel particles, amount of AN present in AN+H2O mixtures (5%, 10%, 20%, 40% and 50% (v/v)), temperature of the system studied, rate of stirring of the solution (number of revolutions per minute) and the amount of concentrated H2SO4 used to stop the hydrolysis of Cu(II), Cu(I) and Ni(II) salts. All these reactions are quite fast and generate a significant amount of Cu(I) in a given time. The role of these concentrated solutions has further been exploited in the purification of precious metals like copper,
doi:10.24214/ijghc/gc/7/3/67984 fatcat:lh2mfrlddvd4vefshr7ugpqpba