Solvent extraction of scandium from pregnant leach solution of nickel laterites

Ferizoğlu, Ece
The aim of this thesis study is the extraction and recovery of scandium from lateritic nickel-cobalt ores by using the solvent extraction method. In this study, different organic and scrubbing reagents were investigated in order to find the most suitable organic extractant for the extraction of scandium with low impurity co-extraction and scrubbing reagent to remove the extracted impurities from the loaded organic phase. In the first part, different organic reagents that are DEHPA, Cyanex 272, Cyanex 923, Ionquest 801 and Primene JMT, were investigated. After the determination of the most suitable organic extractant, synergetic systems were examined and for this reason, TBP and isodecanol, which are defined as modifiers in solvent extraction systems, were used with the previously determined organic extractant. In addition to these, the effects of kerosene type, the pH of the aqueous solution and the volume ratio of organic to aqueous phase on extraction were investigated. Therefore, it was determined that 5% DEHPA + 1% TBP + 94% D80 with A/O: 10/1 phase ratio at pH=0.8 for 10 minutes mixing duration were suitable conditions for scandium extraction. After the extraction, the suitable scrubbing reagents were investigated for the loaded organic. In this part, iron and aluminum are the most critical impurities as well as nickel and cobalt and the main aim is to remove particularly these impurities from the loaded organic phase. In consideration of this, oxalic acid, HCl and H2SO4 were used in the experiments with different molarities. As a result of the series of experiments, 0.75M oxalic acid at O/A: 3/1 phase ratio was determined as a suitable condition for scrubbing. 


Pressure leaching of Sivrihisar-Yunus Emre nickel laterites
Seçen, Berk; Topkaya, Yavuz Ali; Department of Metallurgical and Materials Engineering (2011)
The aim of this thesis study was to extract nickel and cobalt from Sivrihisar limonitic nickel laterite ore by high pressure acid leaching (HPAL) method under most economical operating parameters. Optimizing the conditions to yield a saleable quality mixed hydroxide product from the pregnant leach solution (PLS) was also investigated. To extract high amounts of nickel and cobalt from the laterite matrix; leaching duration, leaching temperature and sulfuric acid/ore ratio were studied at fixed conditions of ...
Solvent extraction behaviour of scandium from lateritic nickel-cobalt ores using different organic reagents
Ferizoglu, Ece; Kaya, Serap; Topkaya, Yavuz Ali (2018-04-01)
Scandium is one of the most important and strategic metals that can be recovered as a by-product from lateritic nickel-cobalt ores. In this research, different extractants were investigated to extract scandium from sulphate medium by using solvent extraction method. Generally, the organic extractants are classified as acidic, neutral and basic reagents. Thus, the aim of the present study was to compare scandium extraction efficiencies of some acidic, neutral and basic organic reagents. For this reason, Ionq...
Improving the Recovery of Phenolic Compounds from Spent Coffee Grounds (SCG) by Environmentally Friendly Extraction Techniques
Okur, İlhami; Söyler, Ulviye Betül; Öztop, Halil Mecit; Alpas, Hami (MDPI AG, 2021-1-25)
The aim of this study was to investigate and compare the effects of different extraction techniques (high hydrostatic pressure-assisted extraction (HHPE), ultrasound-assisted extraction (UAE), and classical solvent extraction (CSE)) on phenolic compounds from spent coffee grounds (SCG). Different HHPE parameters (300, 400 and 500 MPa at 25 °C for 5, 10 and 15 min) and UAE parameters (40%, 50%, and 60% amplitude at 25 °C for 5, 10 and 15 min) were used. These techniques were compared with CSE (at 50 °C for 3...
Extraction of nickel and cobalt from lateritic ores by nitric acid /
Saka, Onur; Topkaya, Yavuz Ali; Department of Metallurgical and Materials Engineering (2014)
This thesis study is related to the extraction kinetics of nickel and cobalt from lateritic nickel ores from Gördes/Manisa region of Turkey. The experimental studies involved the optimization of nitric acid leaching of nickel laterite ores at atmospheric pressure for high nickel and cobalt extraction. The main parameters optimized after the characterization of laterites were the nitric acid concentration, leaching temperature, duration of leaching and the particle size of the ore sample. The atmospheric lea...
Optimization and Comparison of High-Pressure-Assisted Extraction of Phenolic Compounds from Olive Pomace
Okur, İlhami; Öztop, Halil Mecit; Alpas, Hami (2022-12-16)
In this study, it was aimed to find the optimum condition for extraction of phenolic compounds from olive pomace by using high-pressure-assisted extraction (HPAE). In this method, different pressure parameters (300-500 MPa), times (5-15 min), and ethanol concentrations (50-90% v/v) were used. According to Box-Behnken design, 15 experimental runs were performed to find the optimum condition of total phenolic and oleuropein contents. Also, the optimum HPAE condition was compared with that of classical solvent...
Citation Formats
E. Ferizoğlu, “Solvent extraction of scandium from pregnant leach solution of nickel laterites,” M.S. - Master of Science, Middle East Technical University, 2017.