چكيده به لاتين
Nickel is usually found in nature in the form of sulfide and laterite ores. Limonite laterite ore is high in iron; hence hydrometallurgical methods are used to recover metals such as nickel. This study used the leaching and solvent extraction of nickel, limonite laterite ore of Cheshmeh Rostami mine located at Bavanat, Fars province. The sulfation roasting and leaching method was used for the dissolution process. Its effective parameters such as sulfuric acid concentration, roasting temperature, and roasting time were statistically investigated using the surface response method coupled with central composite design by Minitab software. Optimal conditions for maximum nickel and minimum iron dissolution were obtained: sulfuric acid concentration (wt%) 44, leaching temperature 700 ° C and leaching time 50 minutes. Under these conditions, nickel and iron dissolution rates were more than 80% and less than 4%, respectively. To perform the solvent extraction process, a Sufficient volume of the solution was prepared under optimal leaching conditions. The parameters studied in solvent extraction were extractant type (D2EHPA and Cyanex 272), pH (1-7), extranet concentration (20, 10, and 30%), and temperature (40, 30, and 50 ° C). The laboratory results include Cyanex 272 concentration of (v / v%) 20, pH = 5.5-6, and a temperature of 40 ° C were desired in cobalt, manganese, magnesium, zinc, and iron separation from nickel. Under these conditions, cobalt, zinc, iron, and manganese are entirely (100%) extracted, and the amount of nickel and magnesium extraction is less than 20% and more than 80%, respectively. Thus, the impurities enter the organic phase, and the nickel is recovered as a solution in the aqueous phase.
