Solvent Extraction of Gold from Hydrochloric Acid-Leached Nigerian Gold Ore by Tributylphosphate
نویسنده
چکیده
This paper presents an experimental study on the dissolution kinetics and solvent extraction of total gold from Ijero-ekiti (Nigeria) gold ore deposit by hydrochloric acid leaching followed by extraction with Tributylphosphate (TBP) in kerosene. The leaching investigation showed that the gold ore dissolution in HCl solution increases with increasing acid concentration, temperature and with decrease in particle diameter at a stirring rate of 300rpm.The kinetics data has been analyzed and was found to follow diffusion control mechanism with surface chemical reaction as the rate limiting step. About 81.27% of the initial 10g/L of the ore concentrate was dissolved within 120 minutes by 2M HCl solution at 80C using 0.09<Φ<0.12mm particle diameter. The analysis of the residual product (18.73% of the initial gold ore) shows that it consists primary of α–quartz. Furthermore, the solvent extraction studies revealed the extraction efficiency of about 85.28% by TBP in kerosene. This was determined by analyzing the orange-red complex of gold with 4-(2-pyridylazo) resorcinol (PAR) spectrophotometrically at 450 nm from the ore leach liquor at optimal conditions. Finally, the calculated enthalpy and entropy change of 3.56kJ/mol and -21.83J/mol/K were obtained for the extraction system, respectively.
منابع مشابه
Solvent Extraction of Zinc with Triphenylphosphite (TPP) from a Nigerian Sphalerite in Hydrochloric
A hydrmetallurgical study based on the extraction of Zn and Pb from a Nigerian sphalerite mineral leached with 4 M hydrochloric acid has been undertaken. Triphenylphosphite (TPP) has proved to be very effective for the extraction of zinc. With 2 M TPP and at ambient temperature of 25±2°C; 35.71% and 66.7% of Pb and Zn were extracted, respectively, into the organic phase within 60 min. The recov...
متن کاملComparative Cyanide and Thiourea Extraction of Gold Based on Characterization Studies (TECHNICAL NOTE)
This study involved preliminary laboratory test work to identify the relative leaching response to cyanidation and thiourea leaching of an oxidized low grade gold ore based on characterization studies. Huge reserves of gold deposits have been reported from different parts of Iran, especially at Neishaboor area with gold grade of approx 4 ppm. For the mineralogical composition, the nature of the...
متن کاملEffect of Mechanical Activation on the Kinetics of Ammoniacal Thiosulfate Leaching of a Refractory Oxide Gold Ore
The effect of mechanical activation on the kinetics of ammoniacal thiosulfate leaching of a refractory oxide gold ore containing 2.8 ppm Au was investigated. The gold extraction of 99.81% was achieved by 16 h leaching of a sample mechanically activated for 60 minutes. The gold extraction observed for a similar reference sample without mechanical activation was only 55%. Studies revealed that le...
متن کاملFacilitate of Gold Extracting From Mouteh Refractory Gold Ore Using Indigenouse Bacteria
The term biomining have been coined to refer to the use of microorganisms in mining processes as in the biooxidation of refractory gold minerals. The biooxidation of refractory gold ores presents similar characteristics when compared with roasting and pressure oxidation. Almost without exception, microbial extraction procedures are more environmentally friendly. The isolated bacteria in this st...
متن کاملFacilitate of Gold Extracting From Mouteh Refractory Gold Ore Using Indigenouse Bacteria
The term biomining have been coined to refer to the use of microorganisms in mining processes as in the biooxidation of refractory gold minerals. The biooxidation of refractory gold ores presents similar characteristics when compared with roasting and pressure oxidation. Almost without exception, microbial extraction procedures are more environmentally friendly. The isolated bacteria in this st...
متن کامل