Separation of copper and cobalt from pyrite leach solution by solvent extraction

Çokgör, Onur


Removal of cobalt from zinc sulfate solution by cementation prior to zinc electrowinning
Kayın, Pınar Burcu; Topkaya, Yavuz Ali; Department of Metallurgical and Materials Engineering (2003)
The aim of this study was to investigate the removal of cobalt from zinc sulfate solution by cementation with the help of conventional and new type of additives that were 4% Sn-zinc alloy powder and 10% Sn-zinc alloy powder, respectively. Synthetic leach solutions containing 150 g/l Zn and 75 mg/l Co were prepared and used in all of the experiments. The parameters researched with the conventional method were the amount of arsenic trioxide and the effect of copper sulfate on cementation of cobalt. While usin...
Preparation and surface modification of noble metal nanoparticles with tunable optical properties for SERS applications
Kaya, Murat; Volkan, Mürvet; Department of Chemistry (2011)
Metal nanostructures exhibit a wide variety of interesting physical and chemical properties, which can be tailored by altering their size, morphology, composition, and environment. Gold and silver nanostructures have received considerable attention for many decades because of their widespread use in applications such as catalysis, photonics, electronics, optoelectronics, information storage, chemical and biological sensing, surface plasmon resonance and surface-enhanced Raman scattering (SERS) detection. Th...
Extraction of nickel from lateritic ores at atmospheric pressure with agitation leaching
Buyukakinci, E.; Topkaya, Yavuz Ali (2009-06-01)
Nontronitic and limonitic type laterites from "Gordes" nickel deposit located in Western Turkey were subjected to sulfuric acid leaching at atmospheric pressure. Experiments were conducted in order to determine the optimum conditions for agitation leaching by studying various parameters, including time, acid concentration, leaching temperature and particle size. Agitation leach experiments showed that nickel and cobalt could be extracted from both ores. Nickel and cobalt extractions were 96.0% and 63.4% for...
Synthesis of zinc oxide nanoparticles elaborated by microemulsion method
Yildirim, Ozlem Altintas; Durucan, Caner (2010-09-17)
Zinc oxide (ZnO) nanoparticles were synthesized by a reverse microemulsion system formed from sodium bis(2-ethylhexyl)sulfosuccinate (Aerosol OT, or AOT):glycerol:n-heptane. The zinc precursor was zinc acetate dihydrate. The formation of ZnO nanoparticles was achieved by calcination of premature zinc glycerolate microemulsion product in air at 300, 400 and 500 degrees C. The crystal structure and the morphology of the ZnO nanoparticles were characterized by X-ray diffraction (XRD) and scanning electron micr...
Identification and characterization of hydrolytic enzymes of sunn pest (eurygaster integriceps) and cotton bollworm (helicoverpa armigera)
Özgür, Ebru; Öktem, Hüseyin Avni; Department of Biochemistry (2006)
In this study, hydrolytic enzymes from sunn pest (Eurygaster integriceps) and cotton bollworm (Helicoverpa armigera) midguts were identified and characterized in terms of their optimum pH, Km and Vmax values. Hydrolytic activities were also tested for inhibition by several protease and alpha-amylase inhibitors which can be used for the development of insect resistant plants through transgenic technologies. For sunn pest midgut, a low proteolytic activity, belonging mostly to trypsin-like and leucine aminope...
Citation Formats
O. Çokgör, “Separation of copper and cobalt from pyrite leach solution by solvent extraction,” Ph.D. - Doctoral Program, Middle East Technical University, 1991.