Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 13 of 13 for “"Copper extraction"”.
-
Studies On Copper Extraction With Hydroxyoxime Extractants For The Design Of Hollow Fibre Membrane Based Extraction Processes
… the equilibrium and mass transfer data of metal extraction by the use of chelating agents. The limitations of these techniques and models have been highlighted.<br/><br/>Three chelating extractants diluted in EscaidllO were used to study the extraction equilibrium of copper. The extractants are …
-
Investigation of Chalcopyrite Leaching Kinetics by Alternative Leaching Chemicals
… the most abundant sulfide minerals in the world copper deposit. It is known as a refractory sulfide mineral due to passivation during leaching process in a conventional leaching system. In this study, alternative lixiviants, MSA (methanesulfonic acid, CH4SO3) and sulfurous acid (H2SO3) were …
-
Modeling chalcopyrite leaching kinetics
Chalcopyrite (CuFeS2) is the most abundant of the copper sulfides and also one of the most refractory for leaching. Several processing routes have been proposed to overcome drawbacks associated with environmental problems related to copper extraction from this mineral. Atmospheric leaching in …
-
Methodology for determining electronic transference numbers in molten sulfide melts
Electrolysis of molten copper (I) sulfide (Cu2S) in a sulfide-based electrolyte is being investigated for use as a direct path for copper extraction to replace the conventional process of smelting and electrorefining [1]. The allure of an electrolysis process for metals extraction can be enhanced …
-
Effects of intermittent irrigation on the extraction of copper from heap bioleaching systems.
… the effect of intermittent irrigation on the extraction of copper and iron from a low grade chalcopyrite ore in the heap bioleaching system is investigated and compared with the effect under abiotic conditions. As a secondary investigation, the effect of the introduction of layers of fines, …
-
An investigation into the feasibility of bioleaching copper sulphide ore of Nchanga mine, Chingola, Zambia
Bioleaching is now well established for extraction of copper from its low-grade, mixed oxide/sulphide ores in bioheap operations (Watling, 2006). It is claimed bioleaching may be a cheaper alternative to other traditional metal extraction techniques such as smelting and therefore more suitable to …
-
Depletion, Technology and Productivity Growth in Metallic Minerals Industry
… in its natural input in course of cumulative extraction and depletion. <br/><br/>Detailed analysis of the changes in process input intensities and sector productivity corresponding to a representative spectrum of geological transitions in copper ores reveals that the continuous and incremental …
-
Solvent Extraction of Copper, Cobalt, and Nickel Material from the Missouri Cobalt Project in Fredricktown, Missouri
… batteries. Demand for these metals, along with copper, are increasing due to the increased production of electric cars and other electronic devices. Cobalt has historically been mined in the Congo with very dangerous situations and sold on the black market. It has become increasingly apparent …
-
Utilização De Polímeros à Base De Acrilamida Na Remoção De Cobre De Meio Aquoso
… the treatment and removal from the environment. Copper, for example, is a metallic element and in the form of salt is very soluble in water which dificults its removal. In this context, this study aims to evaluate the extraction of copper with acrylamide polymers through the process of assisted …
-
Structural basis for the design of selective complexing agents for transition metals
… of a group of salicylaldoxime ligands, and their copper(II) complexes were carried out. The three of the copper(II) complexes studied, bis-(2-hydroxy-5-methylbenzaldehydeoximato)copper(II), [(L1)2Cu]n, bis-(2-hydroxy-5-methylbenzophenoneoximato)copper(II), [(L5 )2Cu] and …
-
The modelling of equilibrium data for the solvent extraction of metals.
In the design of a solvent extraction plant for metals it is necessary to treat the equilibrium data either graphically or analytically. This enables stagewise calculations to be performed to explore solvent usage and feed conditions and so optimise on the cost of recovery of the metal. The present …
-
Exploration of the thiosulphate process for the dissolution of gold from electronic waste and its recovery through ion-exchange
… attributed to the metals such as gold, silver, copper and palladium found in e-waste. Printed circuit boards (PCBs) are a small but nonetheless crucial fraction of global e-waste making up 6% by mass. The gold content in this small fraction is of much higher concentrations than in typical …
-
A stepwise Study on the characterisation and processing of South African Platinum Group Tailings
… in-situ experimental methods; these are EDTA extraction and oxygen reactivity. It was hypothesised that EDTA extraction would measure the concentration of secondary and oxidised materials on the mineral surfaces; and oxygen reactivity would measure the demand of oxygen in each tailings, and …